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-rw-r--r--.github/ISSUE_TEMPLATE/BUG_REPORT.md22
-rw-r--r--.gitignore2
-rw-r--r--INSTALL.md7
-rw-r--r--MANIFEST.in4
-rw-r--r--README.rst13
-rw-r--r--changelog.d/1172.misc1
-rw-r--r--changelog.d/2142.feature1
-rw-r--r--changelog.d/2380.bugfix1
-rw-r--r--changelog.d/3436.bugfix1
-rw-r--r--changelog.d/4088.bugfix1
-rw-r--r--changelog.d/5978.misc1
-rw-r--r--changelog.d/6019.misc1
-rw-r--r--changelog.d/6077.misc1
-rw-r--r--changelog.d/6084.misc1
-rw-r--r--changelog.d/6101.misc1
-rw-r--r--changelog.d/6108.misc1
-rw-r--r--changelog.d/6109.bugfix1
-rw-r--r--changelog.d/6114.feature1
-rw-r--r--changelog.d/6115.misc1
-rw-r--r--changelog.d/6125.feature1
-rw-r--r--changelog.d/6127.misc1
-rw-r--r--changelog.d/6137.misc1
-rw-r--r--changelog.d/6139.misc1
-rw-r--r--changelog.d/6144.bugfix1
-rw-r--r--changelog.d/6147.bugfix1
-rw-r--r--changelog.d/6148.misc1
-rw-r--r--changelog.d/6150.misc1
-rw-r--r--changelog.d/6152.misc1
-rw-r--r--changelog.d/6153.misc1
-rw-r--r--changelog.d/6154.misc1
-rw-r--r--changelog.d/6155.bugfix1
-rw-r--r--changelog.d/6156.misc1
-rw-r--r--changelog.d/6159.misc1
-rw-r--r--changelog.d/6160.misc1
-rw-r--r--changelog.d/6161.bugfix1
-rw-r--r--changelog.d/6167.misc1
-rw-r--r--changelog.d/6168.bugfix1
-rw-r--r--changelog.d/6170.bugfix1
-rw-r--r--changelog.d/6175.misc1
-rw-r--r--changelog.d/6178.bugfix1
-rw-r--r--changelog.d/6179.misc1
-rw-r--r--changelog.d/6184.misc1
-rw-r--r--changelog.d/6185.bugfix1
-rw-r--r--changelog.d/6186.bugfix1
-rw-r--r--changelog.d/6187.bugfix1
-rw-r--r--changelog.d/6189.misc1
-rw-r--r--changelog.d/6191.misc1
-rw-r--r--changelog.d/6193.misc1
-rw-r--r--changelog.d/6195.bugfix1
-rw-r--r--docs/admin_api/README.rst12
-rw-r--r--docs/sample_config.yaml1
-rw-r--r--mypy.ini16
-rw-r--r--snap/snapcraft.yaml22
-rw-r--r--synapse/__init__.py8
-rw-r--r--synapse/api/auth.py4
-rw-r--r--synapse/api/errors.py3
-rw-r--r--synapse/api/room_versions.py5
-rw-r--r--synapse/app/_base.py4
-rw-r--r--synapse/app/homeserver.py6
-rw-r--r--synapse/config/_base.py191
-rw-r--r--synapse/config/_base.pyi135
-rw-r--r--synapse/config/api.py2
-rw-r--r--synapse/config/appservice.py7
-rw-r--r--synapse/config/captcha.py2
-rw-r--r--synapse/config/cas.py5
-rw-r--r--synapse/config/consent_config.py7
-rw-r--r--synapse/config/database.py2
-rw-r--r--synapse/config/emailconfig.py2
-rw-r--r--synapse/config/groups.py2
-rw-r--r--synapse/config/homeserver.py68
-rw-r--r--synapse/config/jwt_config.py2
-rw-r--r--synapse/config/key.py2
-rw-r--r--synapse/config/logger.py2
-rw-r--r--synapse/config/metrics.py2
-rw-r--r--synapse/config/password.py2
-rw-r--r--synapse/config/password_auth_providers.py6
-rw-r--r--synapse/config/push.py2
-rw-r--r--synapse/config/ratelimiting.py2
-rw-r--r--synapse/config/registration.py4
-rw-r--r--synapse/config/repository.py7
-rw-r--r--synapse/config/room_directory.py2
-rw-r--r--synapse/config/saml2_config.py2
-rw-r--r--synapse/config/server.py12
-rw-r--r--synapse/config/server_notices_config.py6
-rw-r--r--synapse/config/spam_checker.py2
-rw-r--r--synapse/config/stats.py2
-rw-r--r--synapse/config/third_party_event_rules.py2
-rw-r--r--synapse/config/tls.py9
-rw-r--r--synapse/config/tracer.py2
-rw-r--r--synapse/config/user_directory.py2
-rw-r--r--synapse/config/voip.py2
-rw-r--r--synapse/config/workers.py2
-rw-r--r--synapse/federation/federation_server.py13
-rw-r--r--synapse/federation/sender/__init__.py11
-rw-r--r--synapse/federation/transport/server.py8
-rw-r--r--synapse/groups/groups_server.py20
-rw-r--r--synapse/handlers/deactivate_account.py37
-rw-r--r--synapse/handlers/e2e_keys.py10
-rw-r--r--synapse/handlers/e2e_room_keys.py4
-rw-r--r--synapse/handlers/federation.py9
-rw-r--r--synapse/handlers/identity.py353
-rw-r--r--synapse/handlers/presence.py16
-rw-r--r--synapse/handlers/register.py10
-rw-r--r--synapse/handlers/room.py4
-rw-r--r--synapse/handlers/room_list.py341
-rw-r--r--synapse/handlers/room_member.py432
-rw-r--r--synapse/handlers/stats.py13
-rw-r--r--synapse/handlers/user_directory.py17
-rw-r--r--synapse/http/client.py12
-rw-r--r--synapse/http/server.py2
-rw-r--r--synapse/logging/opentracing.py23
-rw-r--r--synapse/logging/utils.py20
-rw-r--r--synapse/metrics/__init__.py4
-rw-r--r--synapse/metrics/_exposition.py4
-rw-r--r--synapse/python_dependencies.py17
-rw-r--r--synapse/rest/client/v1/login.py4
-rw-r--r--synapse/rest/client/v1/room.py26
-rw-r--r--synapse/rest/client/v2_alpha/account.py65
-rw-r--r--synapse/rest/client/v2_alpha/filter.py12
-rw-r--r--synapse/rest/client/v2_alpha/room_keys.py2
-rw-r--r--synapse/rest/client/v2_alpha/sync.py41
-rw-r--r--synapse/rest/media/v1/_base.py2
-rw-r--r--synapse/rest/media/v1/preview_url_resource.py4
-rw-r--r--synapse/rest/media/v1/thumbnailer.py14
-rw-r--r--synapse/rest/media/v1/upload_resource.py8
-rw-r--r--synapse/state/__init__.py24
-rw-r--r--synapse/storage/_base.py56
-rw-r--r--synapse/storage/client_ips.py207
-rw-r--r--synapse/storage/deviceinbox.py51
-rw-r--r--synapse/storage/devices.py63
-rw-r--r--synapse/storage/end_to_end_keys.py18
-rw-r--r--synapse/storage/engines/postgres.py13
-rw-r--r--synapse/storage/engines/sqlite.py6
-rw-r--r--synapse/storage/event_federation.py9
-rw-r--r--synapse/storage/events.py44
-rw-r--r--synapse/storage/events_bg_updates.py12
-rw-r--r--synapse/storage/events_worker.py28
-rw-r--r--synapse/storage/filtering.py4
-rw-r--r--synapse/storage/media_repository.py13
-rw-r--r--synapse/storage/monthly_active_users.py101
-rw-r--r--synapse/storage/presence.py14
-rw-r--r--synapse/storage/push_rule.py16
-rw-r--r--synapse/storage/pusher.py2
-rw-r--r--synapse/storage/receipts.py53
-rw-r--r--synapse/storage/registration.py122
-rw-r--r--synapse/storage/room.py246
-rw-r--r--synapse/storage/roommember.py325
-rw-r--r--synapse/storage/schema/delta/56/drop_unused_event_tables.sql20
-rw-r--r--synapse/storage/schema/delta/56/public_room_list_idx.sql16
-rw-r--r--synapse/storage/schema/delta/56/unique_user_filter_index.py52
-rw-r--r--synapse/storage/search.py68
-rw-r--r--synapse/storage/state.py396
-rw-r--r--synapse/storage/state_deltas.py38
-rw-r--r--synapse/storage/stats.py3
-rw-r--r--synapse/storage/user_directory.py178
-rw-r--r--synapse/storage/user_erasure_store.py18
-rw-r--r--synapse/types.py3
-rw-r--r--synapse/util/async_helpers.py10
-rw-r--r--synapse/util/caches/__init__.py3
-rw-r--r--synapse/util/caches/descriptors.py22
-rw-r--r--synapse/util/caches/treecache.py4
-rw-r--r--synapse/util/metrics.py6
-rw-r--r--synapse/util/module_loader.py2
-rw-r--r--synapse/util/patch_inline_callbacks.py219
-rw-r--r--tests/__init__.py4
-rw-r--r--tests/config/test_tls.py25
-rw-r--r--tests/handlers/test_e2e_room_keys.py47
-rw-r--r--tests/handlers/test_federation.py81
-rw-r--r--tests/handlers/test_roomlist.py39
-rw-r--r--tests/handlers/test_typing.py2
-rw-r--r--tests/patch_inline_callbacks.py94
-rw-r--r--tests/rest/admin/test_admin.py2
-rw-r--r--tests/rest/client/v1/test_rooms.py9
-rw-r--r--tests/rest/client/v2_alpha/test_account.py68
-rw-r--r--tests/rest/client/v2_alpha/test_filter.py2
-rw-r--r--tests/storage/test_end_to_end_keys.py12
-rw-r--r--tests/storage/test_event_federation.py2
-rw-r--r--tests/storage/test_monthly_active_users.py58
-rw-r--r--tox.ini3
179 files changed, 3152 insertions, 2011 deletions
diff --git a/.github/ISSUE_TEMPLATE/BUG_REPORT.md b/.github/ISSUE_TEMPLATE/BUG_REPORT.md
index 5cf844bfb1..9dd05bcba3 100644
--- a/.github/ISSUE_TEMPLATE/BUG_REPORT.md
+++ b/.github/ISSUE_TEMPLATE/BUG_REPORT.md
@@ -7,7 +7,7 @@ about: Create a report to help us improve
 <!--
 
 **IF YOU HAVE SUPPORT QUESTIONS ABOUT RUNNING OR CONFIGURING YOUR OWN HOME SERVER**:
-You will likely get better support more quickly if you ask in ** #matrix:matrix.org ** ;)
+You will likely get better support more quickly if you ask in ** #synapse:matrix.org ** ;)
 
 
 This is a bug report template. By following the instructions below and
@@ -44,22 +44,26 @@ those (please be careful to remove any personal or private data). Please surroun
 <!-- IMPORTANT: please answer the following questions, to help us narrow down the problem -->
 
 <!-- Was this issue identified on matrix.org or another homeserver? -->
-- **Homeserver**: 
+- **Homeserver**:
 
 If not matrix.org:
 
 <!--
-What version of Synapse is running?
-You can find the Synapse version by inspecting the server headers (replace matrix.org with
-your own homeserver domain):
-$ curl -v https://matrix.org/_matrix/client/versions 2>&1 | grep "Server:"
+ What version of Synapse is running?
+
+You can find the Synapse version with this command:
+
+$ curl http://localhost:8008/_synapse/admin/v1/server_version
+
+(You may need to replace `localhost:8008` if Synapse is not configured to
+listen on that port.)
 -->
-- **Version**: 
+- **Version**:
 
-- **Install method**: 
+- **Install method**:
 <!-- examples: package manager/git clone/pip  -->
 
-- **Platform**: 
+- **Platform**:
 <!--
 Tell us about the environment in which your homeserver is operating
 distro, hardware, if it's running in a vm/container, etc.
diff --git a/.gitignore b/.gitignore
index e53d4908d5..af36c00cfa 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,9 +7,11 @@
 *.egg-info
 *.lock
 *.pyc
+*.snap
 *.tac
 _trial_temp/
 _trial_temp*/
+/out
 
 # stuff that is likely to exist when you run a server locally
 /*.db
diff --git a/INSTALL.md b/INSTALL.md
index 3eb979c362..69e423923b 100644
--- a/INSTALL.md
+++ b/INSTALL.md
@@ -349,6 +349,13 @@ sudo pip uninstall py-bcrypt
 sudo pip install py-bcrypt
 ```
 
+### Void Linux
+
+Synapse can be found in the void repositories as 'synapse':
+
+    xbps-install -Su
+    xbps-install -S synapse
+
 ### FreeBSD
 
 Synapse can be installed via FreeBSD Ports or Packages contributed by Brendan Molloy from:
diff --git a/MANIFEST.in b/MANIFEST.in
index 9c2902b8d2..b22be58f3d 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -47,7 +47,5 @@ prune debian
 prune demo/etc
 prune docker
 prune mypy.ini
+prune snap
 prune stubs
-
-exclude jenkins*
-recursive-exclude jenkins *.sh
diff --git a/README.rst b/README.rst
index 2948fd0765..ae51d6ab39 100644
--- a/README.rst
+++ b/README.rst
@@ -381,3 +381,16 @@ indicate that your server is also issuing far more outgoing federation
 requests than can be accounted for by your users' activity, this is a
 likely cause. The misbehavior can be worked around by setting
 ``use_presence: false`` in the Synapse config file.
+
+People can't accept room invitations from me
+--------------------------------------------
+
+The typical failure mode here is that you send an invitation to someone 
+to join a room or direct chat, but when they go to accept it, they get an
+error (typically along the lines of "Invalid signature"). They might see
+something like the following in their logs::
+
+    2019-09-11 19:32:04,271 - synapse.federation.transport.server - 288 - WARNING - GET-11752 - authenticate_request failed: 401: Invalid signature for server <server> with key ed25519:a_EqML: Unable to verify signature for <server>
+
+This is normally caused by a misconfiguration in your reverse-proxy. See
+`<docs/reverse_proxy.rst>`_ and double-check that your settings are correct.
diff --git a/changelog.d/1172.misc b/changelog.d/1172.misc
new file mode 100644
index 0000000000..30b3e56082
--- /dev/null
+++ b/changelog.d/1172.misc
@@ -0,0 +1 @@
+Update `user_filters` table to have a unique index, and non-null columns. Thanks to @pik for contributing this.
\ No newline at end of file
diff --git a/changelog.d/2142.feature b/changelog.d/2142.feature
new file mode 100644
index 0000000000..e21e8325e1
--- /dev/null
+++ b/changelog.d/2142.feature
@@ -0,0 +1 @@
+Improve quality of thumbnails for 1-bit/8-bit color palette images.
diff --git a/changelog.d/2380.bugfix b/changelog.d/2380.bugfix
new file mode 100644
index 0000000000..eae3206031
--- /dev/null
+++ b/changelog.d/2380.bugfix
@@ -0,0 +1 @@
+Return an HTTP 404 instead of 400 when requesting a filter by ID that is unknown to the server. Thanks to @krombel for contributing this!
diff --git a/changelog.d/3436.bugfix b/changelog.d/3436.bugfix
new file mode 100644
index 0000000000..15714a11e0
--- /dev/null
+++ b/changelog.d/3436.bugfix
@@ -0,0 +1 @@
+Fix a problem where users could be invited twice to the same group.
diff --git a/changelog.d/4088.bugfix b/changelog.d/4088.bugfix
new file mode 100644
index 0000000000..61722b6224
--- /dev/null
+++ b/changelog.d/4088.bugfix
@@ -0,0 +1 @@
+Added domain validation when including a list of invitees upon room creation.
\ No newline at end of file
diff --git a/changelog.d/5978.misc b/changelog.d/5978.misc
new file mode 100644
index 0000000000..6d2b69b11b
--- /dev/null
+++ b/changelog.d/5978.misc
@@ -0,0 +1 @@
+Move lookup-related functions from RoomMemberHandler to IdentityHandler.
\ No newline at end of file
diff --git a/changelog.d/6019.misc b/changelog.d/6019.misc
new file mode 100644
index 0000000000..dfee73c28f
--- /dev/null
+++ b/changelog.d/6019.misc
@@ -0,0 +1 @@
+Improve performance of the public room list directory.
diff --git a/changelog.d/6077.misc b/changelog.d/6077.misc
new file mode 100644
index 0000000000..31ac5b97a4
--- /dev/null
+++ b/changelog.d/6077.misc
@@ -0,0 +1 @@
+Edit header dicts docstrings in SimpleHttpClient to note that `str` or `bytes` can be passed as header keys.
diff --git a/changelog.d/6084.misc b/changelog.d/6084.misc
new file mode 100644
index 0000000000..3c33701651
--- /dev/null
+++ b/changelog.d/6084.misc
@@ -0,0 +1 @@
+Add snapcraft packaging information. Contributed by @devec0.
diff --git a/changelog.d/6101.misc b/changelog.d/6101.misc
new file mode 100644
index 0000000000..9743abb9e9
--- /dev/null
+++ b/changelog.d/6101.misc
@@ -0,0 +1 @@
+Kill off half-implemented password-reset via sms.
diff --git a/changelog.d/6108.misc b/changelog.d/6108.misc
new file mode 100644
index 0000000000..6c3f9460e9
--- /dev/null
+++ b/changelog.d/6108.misc
@@ -0,0 +1 @@
+Remove `get_user_by_req` opentracing span and add some tags.
diff --git a/changelog.d/6109.bugfix b/changelog.d/6109.bugfix
new file mode 100644
index 0000000000..da7ac1be4e
--- /dev/null
+++ b/changelog.d/6109.bugfix
@@ -0,0 +1 @@
+Fix bug when uploading a large file: Synapse responds with `M_UNKNOWN` while it should be `M_TOO_LARGE` according to spec. Contributed by Anshul Angaria.
diff --git a/changelog.d/6114.feature b/changelog.d/6114.feature
new file mode 100644
index 0000000000..a34ab12148
--- /dev/null
+++ b/changelog.d/6114.feature
@@ -0,0 +1 @@
+CAS login now provides a default display name for users if a `displayname_attribute` is set in the configuration file.
diff --git a/changelog.d/6115.misc b/changelog.d/6115.misc
new file mode 100644
index 0000000000..b19e395a99
--- /dev/null
+++ b/changelog.d/6115.misc
@@ -0,0 +1 @@
+Drop some unused database tables.
diff --git a/changelog.d/6125.feature b/changelog.d/6125.feature
new file mode 100644
index 0000000000..cbe5f8d3c8
--- /dev/null
+++ b/changelog.d/6125.feature
@@ -0,0 +1 @@
+Reject all pending invites for a user during deactivation.
diff --git a/changelog.d/6127.misc b/changelog.d/6127.misc
new file mode 100644
index 0000000000..7bfbcfc252
--- /dev/null
+++ b/changelog.d/6127.misc
@@ -0,0 +1 @@
+Add env var to turn on tracking of log context changes.
diff --git a/changelog.d/6137.misc b/changelog.d/6137.misc
new file mode 100644
index 0000000000..92a02e71c3
--- /dev/null
+++ b/changelog.d/6137.misc
@@ -0,0 +1 @@
+Refactor configuration loading to allow better typechecking.
diff --git a/changelog.d/6139.misc b/changelog.d/6139.misc
new file mode 100644
index 0000000000..d4b65e7af8
--- /dev/null
+++ b/changelog.d/6139.misc
@@ -0,0 +1 @@
+Log responder when responding to media request.
diff --git a/changelog.d/6144.bugfix b/changelog.d/6144.bugfix
new file mode 100644
index 0000000000..eee63961e4
--- /dev/null
+++ b/changelog.d/6144.bugfix
@@ -0,0 +1 @@
+Prevent user push rules being deleted from a room when it is upgraded.
\ No newline at end of file
diff --git a/changelog.d/6147.bugfix b/changelog.d/6147.bugfix
new file mode 100644
index 0000000000..b0f936d280
--- /dev/null
+++ b/changelog.d/6147.bugfix
@@ -0,0 +1 @@
+Don't 500 when trying to exchange a revoked 3PID invite.
diff --git a/changelog.d/6148.misc b/changelog.d/6148.misc
new file mode 100644
index 0000000000..1d5213345c
--- /dev/null
+++ b/changelog.d/6148.misc
@@ -0,0 +1 @@
+Improve performance of `find_next_generated_user_id` DB query.
diff --git a/changelog.d/6150.misc b/changelog.d/6150.misc
new file mode 100644
index 0000000000..a373c091ab
--- /dev/null
+++ b/changelog.d/6150.misc
@@ -0,0 +1 @@
+Expand type-checking on modules imported by synapse.config.
diff --git a/changelog.d/6152.misc b/changelog.d/6152.misc
new file mode 100644
index 0000000000..dfee73c28f
--- /dev/null
+++ b/changelog.d/6152.misc
@@ -0,0 +1 @@
+Improve performance of the public room list directory.
diff --git a/changelog.d/6153.misc b/changelog.d/6153.misc
new file mode 100644
index 0000000000..dfee73c28f
--- /dev/null
+++ b/changelog.d/6153.misc
@@ -0,0 +1 @@
+Improve performance of the public room list directory.
diff --git a/changelog.d/6154.misc b/changelog.d/6154.misc
new file mode 100644
index 0000000000..dfee73c28f
--- /dev/null
+++ b/changelog.d/6154.misc
@@ -0,0 +1 @@
+Improve performance of the public room list directory.
diff --git a/changelog.d/6155.bugfix b/changelog.d/6155.bugfix
new file mode 100644
index 0000000000..e32c0dce09
--- /dev/null
+++ b/changelog.d/6155.bugfix
@@ -0,0 +1 @@
+Fix transferring notifications and tags when joining an upgraded room that is new to your server.
\ No newline at end of file
diff --git a/changelog.d/6156.misc b/changelog.d/6156.misc
new file mode 100644
index 0000000000..49525e9416
--- /dev/null
+++ b/changelog.d/6156.misc
@@ -0,0 +1 @@
+Use Postgres ANY for selecting many values.
diff --git a/changelog.d/6159.misc b/changelog.d/6159.misc
new file mode 100644
index 0000000000..06cc163f8b
--- /dev/null
+++ b/changelog.d/6159.misc
@@ -0,0 +1 @@
+Add more caching to `_get_joined_users_from_context` DB query.
diff --git a/changelog.d/6160.misc b/changelog.d/6160.misc
new file mode 100644
index 0000000000..3d7cce00e1
--- /dev/null
+++ b/changelog.d/6160.misc
@@ -0,0 +1 @@
+Add some metrics on the federation sender.
diff --git a/changelog.d/6161.bugfix b/changelog.d/6161.bugfix
new file mode 100644
index 0000000000..a0e2adb979
--- /dev/null
+++ b/changelog.d/6161.bugfix
@@ -0,0 +1 @@
+Fix bug where guest account registration can wedge after restart.
diff --git a/changelog.d/6167.misc b/changelog.d/6167.misc
new file mode 100644
index 0000000000..32c96b3681
--- /dev/null
+++ b/changelog.d/6167.misc
@@ -0,0 +1 @@
+Add some logging to the rooms stats updates, to try to track down a flaky test.
diff --git a/changelog.d/6168.bugfix b/changelog.d/6168.bugfix
new file mode 100644
index 0000000000..39e8e9d019
--- /dev/null
+++ b/changelog.d/6168.bugfix
@@ -0,0 +1 @@
+Fix monthly active user reaping where reserved users are specified.
diff --git a/changelog.d/6170.bugfix b/changelog.d/6170.bugfix
new file mode 100644
index 0000000000..52f7ea233c
--- /dev/null
+++ b/changelog.d/6170.bugfix
@@ -0,0 +1 @@
+Fix /federation/v1/state endpoint for recent room versions.
diff --git a/changelog.d/6175.misc b/changelog.d/6175.misc
new file mode 100644
index 0000000000..30b3e56082
--- /dev/null
+++ b/changelog.d/6175.misc
@@ -0,0 +1 @@
+Update `user_filters` table to have a unique index, and non-null columns. Thanks to @pik for contributing this.
\ No newline at end of file
diff --git a/changelog.d/6178.bugfix b/changelog.d/6178.bugfix
new file mode 100644
index 0000000000..cd288c2a44
--- /dev/null
+++ b/changelog.d/6178.bugfix
@@ -0,0 +1 @@
+Make the `synapse_port_db` script create the right indexes on a new PostgreSQL database.
diff --git a/changelog.d/6179.misc b/changelog.d/6179.misc
new file mode 100644
index 0000000000..01c4e71ea3
--- /dev/null
+++ b/changelog.d/6179.misc
@@ -0,0 +1 @@
+Remove unused `timeout` parameter from `_get_public_room_list`.
\ No newline at end of file
diff --git a/changelog.d/6184.misc b/changelog.d/6184.misc
new file mode 100644
index 0000000000..30b3e56082
--- /dev/null
+++ b/changelog.d/6184.misc
@@ -0,0 +1 @@
+Update `user_filters` table to have a unique index, and non-null columns. Thanks to @pik for contributing this.
\ No newline at end of file
diff --git a/changelog.d/6185.bugfix b/changelog.d/6185.bugfix
new file mode 100644
index 0000000000..9d1c669b88
--- /dev/null
+++ b/changelog.d/6185.bugfix
@@ -0,0 +1 @@
+Fix bug where redacted events were sometimes incorrectly censored in the database, breaking APIs that attempted to fetch such events.
diff --git a/changelog.d/6186.bugfix b/changelog.d/6186.bugfix
new file mode 100644
index 0000000000..199ec69032
--- /dev/null
+++ b/changelog.d/6186.bugfix
@@ -0,0 +1 @@
+Fix bug where we were updating censored events as bytes rather than text, occaisonally causing invalid JSON being inserted breaking APIs that attempted to fetch such events.
diff --git a/changelog.d/6187.bugfix b/changelog.d/6187.bugfix
new file mode 100644
index 0000000000..6142c5b98d
--- /dev/null
+++ b/changelog.d/6187.bugfix
@@ -0,0 +1 @@
+Fix occasional missed updates in the room and user directories.
\ No newline at end of file
diff --git a/changelog.d/6189.misc b/changelog.d/6189.misc
new file mode 100644
index 0000000000..a66eb384e6
--- /dev/null
+++ b/changelog.d/6189.misc
@@ -0,0 +1 @@
+Make `version` optional in body of `PUT /room_keys/version/{version}`, since it's redundant.
diff --git a/changelog.d/6191.misc b/changelog.d/6191.misc
new file mode 100644
index 0000000000..3c33701651
--- /dev/null
+++ b/changelog.d/6191.misc
@@ -0,0 +1 @@
+Add snapcraft packaging information. Contributed by @devec0.
diff --git a/changelog.d/6193.misc b/changelog.d/6193.misc
new file mode 100644
index 0000000000..8e3707f8fd
--- /dev/null
+++ b/changelog.d/6193.misc
@@ -0,0 +1 @@
+Make storage layer responsible for adding device names to key, rather than the handler.
diff --git a/changelog.d/6195.bugfix b/changelog.d/6195.bugfix
new file mode 100644
index 0000000000..d22935dbcd
--- /dev/null
+++ b/changelog.d/6195.bugfix
@@ -0,0 +1 @@
+Fix tracing of non-JSON APIs, /media, /key etc.
diff --git a/docs/admin_api/README.rst b/docs/admin_api/README.rst
index d4f564cfae..191806c5b4 100644
--- a/docs/admin_api/README.rst
+++ b/docs/admin_api/README.rst
@@ -10,3 +10,15 @@ server admin by updating the database directly, e.g.:
 ``UPDATE users SET admin = 1 WHERE name = '@foo:bar.com'``
 
 Restarting may be required for the changes to register.
+
+Using an admin access_token
+###########################
+
+Many of the API calls listed in the documentation here will require to include an admin `access_token`.
+Finding your user's `access_token` is client-dependent, but will usually be shown in the client's settings.
+
+Once you have your `access_token`, to include it in a request, the best option is to add the token to a request header:
+
+``curl --header "Authorization: Bearer <access_token>" <the_rest_of_your_API_request>``
+
+Fore more details, please refer to the complete `matrix spec documentation <https://matrix.org/docs/spec/client_server/r0.5.0#using-access-tokens>`_.
diff --git a/docs/sample_config.yaml b/docs/sample_config.yaml
index 43893399ad..8226978ba6 100644
--- a/docs/sample_config.yaml
+++ b/docs/sample_config.yaml
@@ -1220,6 +1220,7 @@ saml2_config:
 #   enabled: true
 #   server_url: "https://cas-server.com"
 #   service_url: "https://homeserver.domain.com:8448"
+#   #displayname_attribute: name
 #   #required_attributes:
 #   #    name: value
 
diff --git a/mypy.ini b/mypy.ini
index 8788574ee3..ffadaddc0b 100644
--- a/mypy.ini
+++ b/mypy.ini
@@ -4,10 +4,6 @@ plugins=mypy_zope:plugin
 follow_imports=skip
 mypy_path=stubs
 
-[mypy-synapse.config.homeserver]
-# this is a mess because of the metaclass shenanigans
-ignore_errors = True
-
 [mypy-zope]
 ignore_missing_imports = True
 
@@ -52,3 +48,15 @@ ignore_missing_imports = True
 
 [mypy-signedjson.*]
 ignore_missing_imports = True
+
+[mypy-prometheus_client.*]
+ignore_missing_imports = True
+
+[mypy-service_identity.*]
+ignore_missing_imports = True
+
+[mypy-daemonize]
+ignore_missing_imports = True
+
+[mypy-sentry_sdk]
+ignore_missing_imports = True
diff --git a/snap/snapcraft.yaml b/snap/snapcraft.yaml
new file mode 100644
index 0000000000..1f7df71db2
--- /dev/null
+++ b/snap/snapcraft.yaml
@@ -0,0 +1,22 @@
+name: matrix-synapse
+base: core18
+version: git 
+summary: Reference Matrix homeserver
+description: |
+  Synapse is the reference Matrix homeserver.
+  Matrix is a federated and decentralised instant messaging and VoIP system.
+
+grade: stable 
+confinement: strict 
+
+apps:
+  matrix-synapse: 
+    command: synctl --no-daemonize start $SNAP_COMMON/homeserver.yaml
+    stop-command: synctl -c $SNAP_COMMON stop
+    plugs: [network-bind, network]
+    daemon: simple 
+parts:
+  matrix-synapse:
+    source: .
+    plugin: python
+    python-version: python3
diff --git a/synapse/__init__.py b/synapse/__init__.py
index 2fc0c3cf85..e908b90177 100644
--- a/synapse/__init__.py
+++ b/synapse/__init__.py
@@ -17,6 +17,7 @@
 """ This is a reference implementation of a Matrix home server.
 """
 
+import os
 import sys
 
 # Check that we're not running on an unsupported Python version.
@@ -36,3 +37,10 @@ except ImportError:
     pass
 
 __version__ = "1.4.1rc1"
+
+if bool(os.environ.get("SYNAPSE_TEST_PATCH_LOG_CONTEXTS", False)):
+    # We import here so that we don't have to install a bunch of deps when
+    # running the packaging tox test.
+    from synapse.util.patch_inline_callbacks import do_patch
+
+    do_patch()
diff --git a/synapse/api/auth.py b/synapse/api/auth.py
index 9e445cd808..cb50579fd2 100644
--- a/synapse/api/auth.py
+++ b/synapse/api/auth.py
@@ -179,7 +179,6 @@ class Auth(object):
     def get_public_keys(self, invite_event):
         return event_auth.get_public_keys(invite_event)
 
-    @opentracing.trace
     @defer.inlineCallbacks
     def get_user_by_req(
         self, request, allow_guest=False, rights="access", allow_expired=False
@@ -212,6 +211,7 @@ class Auth(object):
             if user_id:
                 request.authenticated_entity = user_id
                 opentracing.set_tag("authenticated_entity", user_id)
+                opentracing.set_tag("appservice_id", app_service.id)
 
                 if ip_addr and self.hs.config.track_appservice_user_ips:
                     yield self.store.insert_client_ip(
@@ -263,6 +263,8 @@ class Auth(object):
 
             request.authenticated_entity = user.to_string()
             opentracing.set_tag("authenticated_entity", user.to_string())
+            if device_id:
+                opentracing.set_tag("device_id", device_id)
 
             return synapse.types.create_requester(
                 user, token_id, is_guest, device_id, app_service=app_service
diff --git a/synapse/api/errors.py b/synapse/api/errors.py
index cf1ebf1af2..1bb2e86789 100644
--- a/synapse/api/errors.py
+++ b/synapse/api/errors.py
@@ -17,6 +17,7 @@
 """Contains exceptions and error codes."""
 
 import logging
+from typing import Dict
 
 from six import iteritems
 from six.moves import http_client
@@ -111,7 +112,7 @@ class ProxiedRequestError(SynapseError):
     def __init__(self, code, msg, errcode=Codes.UNKNOWN, additional_fields=None):
         super(ProxiedRequestError, self).__init__(code, msg, errcode)
         if additional_fields is None:
-            self._additional_fields = {}
+            self._additional_fields = {}  # type: Dict
         else:
             self._additional_fields = dict(additional_fields)
 
diff --git a/synapse/api/room_versions.py b/synapse/api/room_versions.py
index 95292b7dec..c6f50fd7b9 100644
--- a/synapse/api/room_versions.py
+++ b/synapse/api/room_versions.py
@@ -12,6 +12,9 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
+
+from typing import Dict
+
 import attr
 
 
@@ -102,4 +105,4 @@ KNOWN_ROOM_VERSIONS = {
         RoomVersions.V4,
         RoomVersions.V5,
     )
-}  # type: dict[str, RoomVersion]
+}  # type: Dict[str, RoomVersion]
diff --git a/synapse/app/_base.py b/synapse/app/_base.py
index c30fdeee9a..2ac7d5c064 100644
--- a/synapse/app/_base.py
+++ b/synapse/app/_base.py
@@ -263,7 +263,9 @@ def start(hs, listeners=None):
         refresh_certificate(hs)
 
         # Start the tracer
-        synapse.logging.opentracing.init_tracer(hs.config)
+        synapse.logging.opentracing.init_tracer(  # type: ignore[attr-defined] # noqa
+            hs.config
+        )
 
         # It is now safe to start your Synapse.
         hs.start_listening(listeners)
diff --git a/synapse/app/homeserver.py b/synapse/app/homeserver.py
index 774326dff9..eb54f56853 100644
--- a/synapse/app/homeserver.py
+++ b/synapse/app/homeserver.py
@@ -605,13 +605,13 @@ def run(hs):
     @defer.inlineCallbacks
     def generate_monthly_active_users():
         current_mau_count = 0
-        reserved_count = 0
+        reserved_users = ()
         store = hs.get_datastore()
         if hs.config.limit_usage_by_mau or hs.config.mau_stats_only:
             current_mau_count = yield store.get_monthly_active_count()
-            reserved_count = yield store.get_registered_reserved_users_count()
+            reserved_users = yield store.get_registered_reserved_users()
         current_mau_gauge.set(float(current_mau_count))
-        registered_reserved_users_mau_gauge.set(float(reserved_count))
+        registered_reserved_users_mau_gauge.set(float(len(reserved_users)))
         max_mau_gauge.set(float(hs.config.max_mau_value))
 
     def start_generate_monthly_active_users():
diff --git a/synapse/config/_base.py b/synapse/config/_base.py
index 31f6530978..08619404bb 100644
--- a/synapse/config/_base.py
+++ b/synapse/config/_base.py
@@ -18,7 +18,9 @@
 import argparse
 import errno
 import os
+from collections import OrderedDict
 from textwrap import dedent
+from typing import Any, MutableMapping, Optional
 
 from six import integer_types
 
@@ -51,7 +53,56 @@ Missing mandatory `server_name` config option.
 """
 
 
+def path_exists(file_path):
+    """Check if a file exists
+
+    Unlike os.path.exists, this throws an exception if there is an error
+    checking if the file exists (for example, if there is a perms error on
+    the parent dir).
+
+    Returns:
+        bool: True if the file exists; False if not.
+    """
+    try:
+        os.stat(file_path)
+        return True
+    except OSError as e:
+        if e.errno != errno.ENOENT:
+            raise e
+        return False
+
+
 class Config(object):
+    """
+    A configuration section, containing configuration keys and values.
+
+    Attributes:
+        section (str): The section title of this config object, such as
+            "tls" or "logger". This is used to refer to it on the root
+            logger (for example, `config.tls.some_option`). Must be
+            defined in subclasses.
+    """
+
+    section = None
+
+    def __init__(self, root_config=None):
+        self.root = root_config
+
+    def __getattr__(self, item: str) -> Any:
+        """
+        Try and fetch a configuration option that does not exist on this class.
+
+        This is so that existing configs that rely on `self.value`, where value
+        is actually from a different config section, continue to work.
+        """
+        if item in ["generate_config_section", "read_config"]:
+            raise AttributeError(item)
+
+        if self.root is None:
+            raise AttributeError(item)
+        else:
+            return self.root._get_unclassed_config(self.section, item)
+
     @staticmethod
     def parse_size(value):
         if isinstance(value, integer_types):
@@ -88,22 +139,7 @@ class Config(object):
 
     @classmethod
     def path_exists(cls, file_path):
-        """Check if a file exists
-
-        Unlike os.path.exists, this throws an exception if there is an error
-        checking if the file exists (for example, if there is a perms error on
-        the parent dir).
-
-        Returns:
-            bool: True if the file exists; False if not.
-        """
-        try:
-            os.stat(file_path)
-            return True
-        except OSError as e:
-            if e.errno != errno.ENOENT:
-                raise e
-            return False
+        return path_exists(file_path)
 
     @classmethod
     def check_file(cls, file_path, config_name):
@@ -136,42 +172,106 @@ class Config(object):
         with open(file_path) as file_stream:
             return file_stream.read()
 
-    def invoke_all(self, name, *args, **kargs):
-        """Invoke all instance methods with the given name and arguments in the
-        class's MRO.
+
+class RootConfig(object):
+    """
+    Holder of an application's configuration.
+
+    What configuration this object holds is defined by `config_classes`, a list
+    of Config classes that will be instantiated and given the contents of a
+    configuration file to read. They can then be accessed on this class by their
+    section name, defined in the Config or dynamically set to be the name of the
+    class, lower-cased and with "Config" removed.
+    """
+
+    config_classes = []
+
+    def __init__(self):
+        self._configs = OrderedDict()
+
+        for config_class in self.config_classes:
+            if config_class.section is None:
+                raise ValueError("%r requires a section name" % (config_class,))
+
+            try:
+                conf = config_class(self)
+            except Exception as e:
+                raise Exception("Failed making %s: %r" % (config_class.section, e))
+            self._configs[config_class.section] = conf
+
+    def __getattr__(self, item: str) -> Any:
+        """
+        Redirect lookups on this object either to config objects, or values on
+        config objects, so that `config.tls.blah` works, as well as legacy uses
+        of things like `config.server_name`. It will first look up the config
+        section name, and then values on those config classes.
+        """
+        if item in self._configs.keys():
+            return self._configs[item]
+
+        return self._get_unclassed_config(None, item)
+
+    def _get_unclassed_config(self, asking_section: Optional[str], item: str):
+        """
+        Fetch a config value from one of the instantiated config classes that
+        has not been fetched directly.
+
+        Args:
+            asking_section: If this check is coming from a Config child, which
+                one? This section will not be asked if it has the value.
+            item: The configuration value key.
+
+        Raises:
+            AttributeError if no config classes have the config key. The body
+                will contain what sections were checked.
+        """
+        for key, val in self._configs.items():
+            if key == asking_section:
+                continue
+
+            if item in dir(val):
+                return getattr(val, item)
+
+        raise AttributeError(item, "not found in %s" % (list(self._configs.keys()),))
+
+    def invoke_all(self, func_name: str, *args, **kwargs) -> MutableMapping[str, Any]:
+        """
+        Invoke a function on all instantiated config objects this RootConfig is
+        configured to use.
 
         Args:
-            name (str): Name of function to invoke
+            func_name: Name of function to invoke
             *args
             **kwargs
-
         Returns:
-            list: The list of the return values from each method called
+            ordered dictionary of config section name and the result of the
+            function from it.
         """
-        results = []
-        for cls in type(self).mro():
-            if name in cls.__dict__:
-                results.append(getattr(cls, name)(self, *args, **kargs))
-        return results
+        res = OrderedDict()
+
+        for name, config in self._configs.items():
+            if hasattr(config, func_name):
+                res[name] = getattr(config, func_name)(*args, **kwargs)
+
+        return res
 
     @classmethod
-    def invoke_all_static(cls, name, *args, **kargs):
-        """Invoke all static methods with the given name and arguments in the
-        class's MRO.
+    def invoke_all_static(cls, func_name: str, *args, **kwargs):
+        """
+        Invoke a static function on config objects this RootConfig is
+        configured to use.
 
         Args:
-            name (str): Name of function to invoke
+            func_name: Name of function to invoke
             *args
             **kwargs
-
         Returns:
-            list: The list of the return values from each method called
+            ordered dictionary of config section name and the result of the
+            function from it.
         """
-        results = []
-        for c in cls.mro():
-            if name in c.__dict__:
-                results.append(getattr(c, name)(*args, **kargs))
-        return results
+        for config in cls.config_classes:
+            if hasattr(config, func_name):
+                getattr(config, func_name)(*args, **kwargs)
 
     def generate_config(
         self,
@@ -187,7 +287,8 @@ class Config(object):
         tls_private_key_path=None,
         acme_domain=None,
     ):
-        """Build a default configuration file
+        """
+        Build a default configuration file
 
         This is used when the user explicitly asks us to generate a config file
         (eg with --generate_config).
@@ -242,6 +343,7 @@ class Config(object):
         Returns:
             str: the yaml config file
         """
+
         return "\n\n".join(
             dedent(conf)
             for conf in self.invoke_all(
@@ -257,7 +359,7 @@ class Config(object):
                 tls_certificate_path=tls_certificate_path,
                 tls_private_key_path=tls_private_key_path,
                 acme_domain=acme_domain,
-            )
+            ).values()
         )
 
     @classmethod
@@ -444,7 +546,7 @@ class Config(object):
                 )
 
             (config_path,) = config_files
-            if not cls.path_exists(config_path):
+            if not path_exists(config_path):
                 print("Generating config file %s" % (config_path,))
 
                 if config_args.data_directory:
@@ -469,7 +571,7 @@ class Config(object):
                     open_private_ports=config_args.open_private_ports,
                 )
 
-                if not cls.path_exists(config_dir_path):
+                if not path_exists(config_dir_path):
                     os.makedirs(config_dir_path)
                 with open(config_path, "w") as config_file:
                     config_file.write("# vim:ft=yaml\n\n")
@@ -518,7 +620,7 @@ class Config(object):
 
         return obj
 
-    def parse_config_dict(self, config_dict, config_dir_path, data_dir_path):
+    def parse_config_dict(self, config_dict, config_dir_path=None, data_dir_path=None):
         """Read the information from the config dict into this Config object.
 
         Args:
@@ -607,3 +709,6 @@ def find_config_files(search_paths):
             else:
                 config_files.append(config_path)
     return config_files
+
+
+__all__ = ["Config", "RootConfig"]
diff --git a/synapse/config/_base.pyi b/synapse/config/_base.pyi
new file mode 100644
index 0000000000..86bc965ee4
--- /dev/null
+++ b/synapse/config/_base.pyi
@@ -0,0 +1,135 @@
+from typing import Any, List, Optional
+
+from synapse.config import (
+    api,
+    appservice,
+    captcha,
+    cas,
+    consent_config,
+    database,
+    emailconfig,
+    groups,
+    jwt_config,
+    key,
+    logger,
+    metrics,
+    password,
+    password_auth_providers,
+    push,
+    ratelimiting,
+    registration,
+    repository,
+    room_directory,
+    saml2_config,
+    server,
+    server_notices_config,
+    spam_checker,
+    stats,
+    third_party_event_rules,
+    tls,
+    tracer,
+    user_directory,
+    voip,
+    workers,
+)
+
+class ConfigError(Exception): ...
+
+MISSING_REPORT_STATS_CONFIG_INSTRUCTIONS: str
+MISSING_REPORT_STATS_SPIEL: str
+MISSING_SERVER_NAME: str
+
+def path_exists(file_path: str): ...
+
+class RootConfig:
+    server: server.ServerConfig
+    tls: tls.TlsConfig
+    database: database.DatabaseConfig
+    logging: logger.LoggingConfig
+    ratelimit: ratelimiting.RatelimitConfig
+    media: repository.ContentRepositoryConfig
+    captcha: captcha.CaptchaConfig
+    voip: voip.VoipConfig
+    registration: registration.RegistrationConfig
+    metrics: metrics.MetricsConfig
+    api: api.ApiConfig
+    appservice: appservice.AppServiceConfig
+    key: key.KeyConfig
+    saml2: saml2_config.SAML2Config
+    cas: cas.CasConfig
+    jwt: jwt_config.JWTConfig
+    password: password.PasswordConfig
+    email: emailconfig.EmailConfig
+    worker: workers.WorkerConfig
+    authproviders: password_auth_providers.PasswordAuthProviderConfig
+    push: push.PushConfig
+    spamchecker: spam_checker.SpamCheckerConfig
+    groups: groups.GroupsConfig
+    userdirectory: user_directory.UserDirectoryConfig
+    consent: consent_config.ConsentConfig
+    stats: stats.StatsConfig
+    servernotices: server_notices_config.ServerNoticesConfig
+    roomdirectory: room_directory.RoomDirectoryConfig
+    thirdpartyrules: third_party_event_rules.ThirdPartyRulesConfig
+    tracer: tracer.TracerConfig
+
+    config_classes: List = ...
+    def __init__(self) -> None: ...
+    def invoke_all(self, func_name: str, *args: Any, **kwargs: Any): ...
+    @classmethod
+    def invoke_all_static(cls, func_name: str, *args: Any, **kwargs: Any) -> None: ...
+    def __getattr__(self, item: str): ...
+    def parse_config_dict(
+        self,
+        config_dict: Any,
+        config_dir_path: Optional[Any] = ...,
+        data_dir_path: Optional[Any] = ...,
+    ) -> None: ...
+    read_config: Any = ...
+    def generate_config(
+        self,
+        config_dir_path: str,
+        data_dir_path: str,
+        server_name: str,
+        generate_secrets: bool = ...,
+        report_stats: Optional[str] = ...,
+        open_private_ports: bool = ...,
+        listeners: Optional[Any] = ...,
+        database_conf: Optional[Any] = ...,
+        tls_certificate_path: Optional[str] = ...,
+        tls_private_key_path: Optional[str] = ...,
+        acme_domain: Optional[str] = ...,
+    ): ...
+    @classmethod
+    def load_or_generate_config(cls, description: Any, argv: Any): ...
+    @classmethod
+    def load_config(cls, description: Any, argv: Any): ...
+    @classmethod
+    def add_arguments_to_parser(cls, config_parser: Any) -> None: ...
+    @classmethod
+    def load_config_with_parser(cls, parser: Any, argv: Any): ...
+    def generate_missing_files(
+        self, config_dict: dict, config_dir_path: str
+    ) -> None: ...
+
+class Config:
+    root: RootConfig
+    def __init__(self, root_config: Optional[RootConfig] = ...) -> None: ...
+    def __getattr__(self, item: str, from_root: bool = ...): ...
+    @staticmethod
+    def parse_size(value: Any): ...
+    @staticmethod
+    def parse_duration(value: Any): ...
+    @staticmethod
+    def abspath(file_path: Optional[str]): ...
+    @classmethod
+    def path_exists(cls, file_path: str): ...
+    @classmethod
+    def check_file(cls, file_path: str, config_name: str): ...
+    @classmethod
+    def ensure_directory(cls, dir_path: str): ...
+    @classmethod
+    def read_file(cls, file_path: str, config_name: str): ...
+
+def read_config_files(config_files: List[str]): ...
+def find_config_files(search_paths: List[str]): ...
diff --git a/synapse/config/api.py b/synapse/config/api.py
index dddea79a8a..74cd53a8ed 100644
--- a/synapse/config/api.py
+++ b/synapse/config/api.py
@@ -18,6 +18,8 @@ from ._base import Config
 
 
 class ApiConfig(Config):
+    section = "api"
+
     def read_config(self, config, **kwargs):
         self.room_invite_state_types = config.get(
             "room_invite_state_types",
diff --git a/synapse/config/appservice.py b/synapse/config/appservice.py
index 8387ff6805..9b4682222d 100644
--- a/synapse/config/appservice.py
+++ b/synapse/config/appservice.py
@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import logging
+from typing import Dict
 
 from six import string_types
 from six.moves.urllib import parse as urlparse
@@ -29,6 +30,8 @@ logger = logging.getLogger(__name__)
 
 
 class AppServiceConfig(Config):
+    section = "appservice"
+
     def read_config(self, config, **kwargs):
         self.app_service_config_files = config.get("app_service_config_files", [])
         self.notify_appservices = config.get("notify_appservices", True)
@@ -56,8 +59,8 @@ def load_appservices(hostname, config_files):
         return []
 
     # Dicts of value -> filename
-    seen_as_tokens = {}
-    seen_ids = {}
+    seen_as_tokens = {}  # type: Dict[str, str]
+    seen_ids = {}  # type: Dict[str, str]
 
     appservices = []
 
diff --git a/synapse/config/captcha.py b/synapse/config/captcha.py
index 8dac8152cf..44bd5c6799 100644
--- a/synapse/config/captcha.py
+++ b/synapse/config/captcha.py
@@ -16,6 +16,8 @@ from ._base import Config
 
 
 class CaptchaConfig(Config):
+    section = "captcha"
+
     def read_config(self, config, **kwargs):
         self.recaptcha_private_key = config.get("recaptcha_private_key")
         self.recaptcha_public_key = config.get("recaptcha_public_key")
diff --git a/synapse/config/cas.py b/synapse/config/cas.py
index ebe34d933b..4526c1a67b 100644
--- a/synapse/config/cas.py
+++ b/synapse/config/cas.py
@@ -22,17 +22,21 @@ class CasConfig(Config):
     cas_server_url: URL of CAS server
     """
 
+    section = "cas"
+
     def read_config(self, config, **kwargs):
         cas_config = config.get("cas_config", None)
         if cas_config:
             self.cas_enabled = cas_config.get("enabled", True)
             self.cas_server_url = cas_config["server_url"]
             self.cas_service_url = cas_config["service_url"]
+            self.cas_displayname_attribute = cas_config.get("displayname_attribute")
             self.cas_required_attributes = cas_config.get("required_attributes", {})
         else:
             self.cas_enabled = False
             self.cas_server_url = None
             self.cas_service_url = None
+            self.cas_displayname_attribute = None
             self.cas_required_attributes = {}
 
     def generate_config_section(self, config_dir_path, server_name, **kwargs):
@@ -43,6 +47,7 @@ class CasConfig(Config):
         #   enabled: true
         #   server_url: "https://cas-server.com"
         #   service_url: "https://homeserver.domain.com:8448"
+        #   #displayname_attribute: name
         #   #required_attributes:
         #   #    name: value
         """
diff --git a/synapse/config/consent_config.py b/synapse/config/consent_config.py
index 94916f3a49..62c4c44d60 100644
--- a/synapse/config/consent_config.py
+++ b/synapse/config/consent_config.py
@@ -73,8 +73,11 @@ DEFAULT_CONFIG = """\
 
 
 class ConsentConfig(Config):
-    def __init__(self):
-        super(ConsentConfig, self).__init__()
+
+    section = "consent"
+
+    def __init__(self, *args):
+        super(ConsentConfig, self).__init__(*args)
 
         self.user_consent_version = None
         self.user_consent_template_dir = None
diff --git a/synapse/config/database.py b/synapse/config/database.py
index 118aafbd4a..0e2509f0b1 100644
--- a/synapse/config/database.py
+++ b/synapse/config/database.py
@@ -21,6 +21,8 @@ from ._base import Config
 
 
 class DatabaseConfig(Config):
+    section = "database"
+
     def read_config(self, config, **kwargs):
         self.event_cache_size = self.parse_size(config.get("event_cache_size", "10K"))
 
diff --git a/synapse/config/emailconfig.py b/synapse/config/emailconfig.py
index d9b43de660..658897a77e 100644
--- a/synapse/config/emailconfig.py
+++ b/synapse/config/emailconfig.py
@@ -28,6 +28,8 @@ from ._base import Config, ConfigError
 
 
 class EmailConfig(Config):
+    section = "email"
+
     def read_config(self, config, **kwargs):
         # TODO: We should separate better the email configuration from the notification
         # and account validity config.
diff --git a/synapse/config/groups.py b/synapse/config/groups.py
index 2a522b5f44..d6862d9a64 100644
--- a/synapse/config/groups.py
+++ b/synapse/config/groups.py
@@ -17,6 +17,8 @@ from ._base import Config
 
 
 class GroupsConfig(Config):
+    section = "groups"
+
     def read_config(self, config, **kwargs):
         self.enable_group_creation = config.get("enable_group_creation", False)
         self.group_creation_prefix = config.get("group_creation_prefix", "")
diff --git a/synapse/config/homeserver.py b/synapse/config/homeserver.py
index 72acad4f18..6e348671c7 100644
--- a/synapse/config/homeserver.py
+++ b/synapse/config/homeserver.py
@@ -14,6 +14,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+from ._base import RootConfig
 from .api import ApiConfig
 from .appservice import AppServiceConfig
 from .captcha import CaptchaConfig
@@ -46,36 +47,37 @@ from .voip import VoipConfig
 from .workers import WorkerConfig
 
 
-class HomeServerConfig(
-    ServerConfig,
-    TlsConfig,
-    DatabaseConfig,
-    LoggingConfig,
-    RatelimitConfig,
-    ContentRepositoryConfig,
-    CaptchaConfig,
-    VoipConfig,
-    RegistrationConfig,
-    MetricsConfig,
-    ApiConfig,
-    AppServiceConfig,
-    KeyConfig,
-    SAML2Config,
-    CasConfig,
-    JWTConfig,
-    PasswordConfig,
-    EmailConfig,
-    WorkerConfig,
-    PasswordAuthProviderConfig,
-    PushConfig,
-    SpamCheckerConfig,
-    GroupsConfig,
-    UserDirectoryConfig,
-    ConsentConfig,
-    StatsConfig,
-    ServerNoticesConfig,
-    RoomDirectoryConfig,
-    ThirdPartyRulesConfig,
-    TracerConfig,
-):
-    pass
+class HomeServerConfig(RootConfig):
+
+    config_classes = [
+        ServerConfig,
+        TlsConfig,
+        DatabaseConfig,
+        LoggingConfig,
+        RatelimitConfig,
+        ContentRepositoryConfig,
+        CaptchaConfig,
+        VoipConfig,
+        RegistrationConfig,
+        MetricsConfig,
+        ApiConfig,
+        AppServiceConfig,
+        KeyConfig,
+        SAML2Config,
+        CasConfig,
+        JWTConfig,
+        PasswordConfig,
+        EmailConfig,
+        WorkerConfig,
+        PasswordAuthProviderConfig,
+        PushConfig,
+        SpamCheckerConfig,
+        GroupsConfig,
+        UserDirectoryConfig,
+        ConsentConfig,
+        StatsConfig,
+        ServerNoticesConfig,
+        RoomDirectoryConfig,
+        ThirdPartyRulesConfig,
+        TracerConfig,
+    ]
diff --git a/synapse/config/jwt_config.py b/synapse/config/jwt_config.py
index 36d87cef03..a568726985 100644
--- a/synapse/config/jwt_config.py
+++ b/synapse/config/jwt_config.py
@@ -23,6 +23,8 @@ MISSING_JWT = """Missing jwt library. This is required for jwt login.
 
 
 class JWTConfig(Config):
+    section = "jwt"
+
     def read_config(self, config, **kwargs):
         jwt_config = config.get("jwt_config", None)
         if jwt_config:
diff --git a/synapse/config/key.py b/synapse/config/key.py
index f039f96e9c..ec5d430afb 100644
--- a/synapse/config/key.py
+++ b/synapse/config/key.py
@@ -92,6 +92,8 @@ class TrustedKeyServer(object):
 
 
 class KeyConfig(Config):
+    section = "key"
+
     def read_config(self, config, config_dir_path, **kwargs):
         # the signing key can be specified inline or in a separate file
         if "signing_key" in config:
diff --git a/synapse/config/logger.py b/synapse/config/logger.py
index 767ecfdf09..d609ec111b 100644
--- a/synapse/config/logger.py
+++ b/synapse/config/logger.py
@@ -84,6 +84,8 @@ root:
 
 
 class LoggingConfig(Config):
+    section = "logging"
+
     def read_config(self, config, **kwargs):
         self.log_config = self.abspath(config.get("log_config"))
         self.no_redirect_stdio = config.get("no_redirect_stdio", False)
diff --git a/synapse/config/metrics.py b/synapse/config/metrics.py
index ec35a6b868..282a43bddb 100644
--- a/synapse/config/metrics.py
+++ b/synapse/config/metrics.py
@@ -34,6 +34,8 @@ class MetricsFlags(object):
 
 
 class MetricsConfig(Config):
+    section = "metrics"
+
     def read_config(self, config, **kwargs):
         self.enable_metrics = config.get("enable_metrics", False)
         self.report_stats = config.get("report_stats", None)
diff --git a/synapse/config/password.py b/synapse/config/password.py
index d5b5953f2f..2a634ac751 100644
--- a/synapse/config/password.py
+++ b/synapse/config/password.py
@@ -20,6 +20,8 @@ class PasswordConfig(Config):
     """Password login configuration
     """
 
+    section = "password"
+
     def read_config(self, config, **kwargs):
         password_config = config.get("password_config", {})
         if password_config is None:
diff --git a/synapse/config/password_auth_providers.py b/synapse/config/password_auth_providers.py
index 788c39c9fb..9746bbc681 100644
--- a/synapse/config/password_auth_providers.py
+++ b/synapse/config/password_auth_providers.py
@@ -13,6 +13,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+from typing import Any, List
+
 from synapse.util.module_loader import load_module
 
 from ._base import Config
@@ -21,8 +23,10 @@ LDAP_PROVIDER = "ldap_auth_provider.LdapAuthProvider"
 
 
 class PasswordAuthProviderConfig(Config):
+    section = "authproviders"
+
     def read_config(self, config, **kwargs):
-        self.password_providers = []
+        self.password_providers = []  # type: List[Any]
         providers = []
 
         # We want to be backwards compatible with the old `ldap_config`
diff --git a/synapse/config/push.py b/synapse/config/push.py
index 1b932722a5..0910958649 100644
--- a/synapse/config/push.py
+++ b/synapse/config/push.py
@@ -18,6 +18,8 @@ from ._base import Config
 
 
 class PushConfig(Config):
+    section = "push"
+
     def read_config(self, config, **kwargs):
         push_config = config.get("push", {})
         self.push_include_content = push_config.get("include_content", True)
diff --git a/synapse/config/ratelimiting.py b/synapse/config/ratelimiting.py
index 587e2862b7..947f653e03 100644
--- a/synapse/config/ratelimiting.py
+++ b/synapse/config/ratelimiting.py
@@ -36,6 +36,8 @@ class FederationRateLimitConfig(object):
 
 
 class RatelimitConfig(Config):
+    section = "ratelimiting"
+
     def read_config(self, config, **kwargs):
 
         # Load the new-style messages config if it exists. Otherwise fall back
diff --git a/synapse/config/registration.py b/synapse/config/registration.py
index bef89e2bf4..b3e3e6dda2 100644
--- a/synapse/config/registration.py
+++ b/synapse/config/registration.py
@@ -24,6 +24,8 @@ from synapse.util.stringutils import random_string_with_symbols
 
 
 class AccountValidityConfig(Config):
+    section = "accountvalidity"
+
     def __init__(self, config, synapse_config):
         self.enabled = config.get("enabled", False)
         self.renew_by_email_enabled = "renew_at" in config
@@ -77,6 +79,8 @@ class AccountValidityConfig(Config):
 
 
 class RegistrationConfig(Config):
+    section = "registration"
+
     def read_config(self, config, **kwargs):
         self.enable_registration = bool(
             strtobool(str(config.get("enable_registration", False)))
diff --git a/synapse/config/repository.py b/synapse/config/repository.py
index 52e014608a..d0205e14b9 100644
--- a/synapse/config/repository.py
+++ b/synapse/config/repository.py
@@ -15,6 +15,7 @@
 
 import os
 from collections import namedtuple
+from typing import Dict, List
 
 from synapse.python_dependencies import DependencyException, check_requirements
 from synapse.util.module_loader import load_module
@@ -61,7 +62,7 @@ def parse_thumbnail_requirements(thumbnail_sizes):
         Dictionary mapping from media type string to list of
         ThumbnailRequirement tuples.
     """
-    requirements = {}
+    requirements = {}  # type: Dict[str, List]
     for size in thumbnail_sizes:
         width = size["width"]
         height = size["height"]
@@ -77,6 +78,8 @@ def parse_thumbnail_requirements(thumbnail_sizes):
 
 
 class ContentRepositoryConfig(Config):
+    section = "media"
+
     def read_config(self, config, **kwargs):
 
         # Only enable the media repo if either the media repo is enabled or the
@@ -130,7 +133,7 @@ class ContentRepositoryConfig(Config):
         #
         # We don't create the storage providers here as not all workers need
         # them to be started.
-        self.media_storage_providers = []
+        self.media_storage_providers = []  # type: List[tuple]
 
         for provider_config in storage_providers:
             # We special case the module "file_system" so as not to need to
diff --git a/synapse/config/room_directory.py b/synapse/config/room_directory.py
index a92693017b..7c9f05bde4 100644
--- a/synapse/config/room_directory.py
+++ b/synapse/config/room_directory.py
@@ -19,6 +19,8 @@ from ._base import Config, ConfigError
 
 
 class RoomDirectoryConfig(Config):
+    section = "roomdirectory"
+
     def read_config(self, config, **kwargs):
         self.enable_room_list_search = config.get("enable_room_list_search", True)
 
diff --git a/synapse/config/saml2_config.py b/synapse/config/saml2_config.py
index ab34b41ca8..c407e13680 100644
--- a/synapse/config/saml2_config.py
+++ b/synapse/config/saml2_config.py
@@ -55,6 +55,8 @@ def _dict_merge(merge_dict, into_dict):
 
 
 class SAML2Config(Config):
+    section = "saml2"
+
     def read_config(self, config, **kwargs):
         self.saml2_enabled = False
 
diff --git a/synapse/config/server.py b/synapse/config/server.py
index 536ee7f29c..afc4d6a4ab 100644
--- a/synapse/config/server.py
+++ b/synapse/config/server.py
@@ -19,6 +19,7 @@ import logging
 import os.path
 import re
 from textwrap import indent
+from typing import List
 
 import attr
 import yaml
@@ -57,6 +58,8 @@ on how to configure the new listener.
 
 
 class ServerConfig(Config):
+    section = "server"
+
     def read_config(self, config, **kwargs):
         self.server_name = config["server_name"]
         self.server_context = config.get("server_context", None)
@@ -243,7 +246,7 @@ class ServerConfig(Config):
         # events with profile information that differ from the target's global profile.
         self.allow_per_room_profiles = config.get("allow_per_room_profiles", True)
 
-        self.listeners = []
+        self.listeners = []  # type: List[dict]
         for listener in config.get("listeners", []):
             if not isinstance(listener.get("port", None), int):
                 raise ConfigError(
@@ -287,7 +290,10 @@ class ServerConfig(Config):
                 validator=attr.validators.instance_of(bool), default=False
             )
             complexity = attr.ib(
-                validator=attr.validators.instance_of((int, float)), default=1.0
+                validator=attr.validators.instance_of(
+                    (float, int)  # type: ignore[arg-type] # noqa
+                ),
+                default=1.0,
             )
             complexity_error = attr.ib(
                 validator=attr.validators.instance_of(str),
@@ -366,7 +372,7 @@ class ServerConfig(Config):
             "cleanup_extremities_with_dummy_events", True
         )
 
-    def has_tls_listener(self):
+    def has_tls_listener(self) -> bool:
         return any(l["tls"] for l in self.listeners)
 
     def generate_config_section(
diff --git a/synapse/config/server_notices_config.py b/synapse/config/server_notices_config.py
index eaac3d73bc..6ea2ea8869 100644
--- a/synapse/config/server_notices_config.py
+++ b/synapse/config/server_notices_config.py
@@ -59,8 +59,10 @@ class ServerNoticesConfig(Config):
             None if server notices are not enabled.
     """
 
-    def __init__(self):
-        super(ServerNoticesConfig, self).__init__()
+    section = "servernotices"
+
+    def __init__(self, *args):
+        super(ServerNoticesConfig, self).__init__(*args)
         self.server_notices_mxid = None
         self.server_notices_mxid_display_name = None
         self.server_notices_mxid_avatar_url = None
diff --git a/synapse/config/spam_checker.py b/synapse/config/spam_checker.py
index e40797ab50..36e0ddab5c 100644
--- a/synapse/config/spam_checker.py
+++ b/synapse/config/spam_checker.py
@@ -19,6 +19,8 @@ from ._base import Config
 
 
 class SpamCheckerConfig(Config):
+    section = "spamchecker"
+
     def read_config(self, config, **kwargs):
         self.spam_checker = None
 
diff --git a/synapse/config/stats.py b/synapse/config/stats.py
index b18ddbd1fa..62485189ea 100644
--- a/synapse/config/stats.py
+++ b/synapse/config/stats.py
@@ -25,6 +25,8 @@ class StatsConfig(Config):
     Configuration for the behaviour of synapse's stats engine
     """
 
+    section = "stats"
+
     def read_config(self, config, **kwargs):
         self.stats_enabled = True
         self.stats_bucket_size = 86400 * 1000
diff --git a/synapse/config/third_party_event_rules.py b/synapse/config/third_party_event_rules.py
index b3431441b9..10a99c792e 100644
--- a/synapse/config/third_party_event_rules.py
+++ b/synapse/config/third_party_event_rules.py
@@ -19,6 +19,8 @@ from ._base import Config
 
 
 class ThirdPartyRulesConfig(Config):
+    section = "thirdpartyrules"
+
     def read_config(self, config, **kwargs):
         self.third_party_event_rules = None
 
diff --git a/synapse/config/tls.py b/synapse/config/tls.py
index fc47ba3e9a..f06341eb67 100644
--- a/synapse/config/tls.py
+++ b/synapse/config/tls.py
@@ -18,6 +18,7 @@ import os
 import warnings
 from datetime import datetime
 from hashlib import sha256
+from typing import List
 
 import six
 
@@ -33,7 +34,9 @@ logger = logging.getLogger(__name__)
 
 
 class TlsConfig(Config):
-    def read_config(self, config, config_dir_path, **kwargs):
+    section = "tls"
+
+    def read_config(self, config: dict, config_dir_path: str, **kwargs):
 
         acme_config = config.get("acme", None)
         if acme_config is None:
@@ -57,7 +60,7 @@ class TlsConfig(Config):
         self.tls_certificate_file = self.abspath(config.get("tls_certificate_path"))
         self.tls_private_key_file = self.abspath(config.get("tls_private_key_path"))
 
-        if self.has_tls_listener():
+        if self.root.server.has_tls_listener():
             if not self.tls_certificate_file:
                 raise ConfigError(
                     "tls_certificate_path must be specified if TLS-enabled listeners are "
@@ -108,7 +111,7 @@ class TlsConfig(Config):
         )
 
         # Support globs (*) in whitelist values
-        self.federation_certificate_verification_whitelist = []
+        self.federation_certificate_verification_whitelist = []  # type: List[str]
         for entry in fed_whitelist_entries:
             try:
                 entry_regex = glob_to_regex(entry.encode("ascii").decode("ascii"))
diff --git a/synapse/config/tracer.py b/synapse/config/tracer.py
index 85d99a3166..8be1346113 100644
--- a/synapse/config/tracer.py
+++ b/synapse/config/tracer.py
@@ -19,6 +19,8 @@ from ._base import Config, ConfigError
 
 
 class TracerConfig(Config):
+    section = "tracing"
+
     def read_config(self, config, **kwargs):
         opentracing_config = config.get("opentracing")
         if opentracing_config is None:
diff --git a/synapse/config/user_directory.py b/synapse/config/user_directory.py
index f6313e17d4..c8d19c5d6b 100644
--- a/synapse/config/user_directory.py
+++ b/synapse/config/user_directory.py
@@ -21,6 +21,8 @@ class UserDirectoryConfig(Config):
     Configuration for the behaviour of the /user_directory API
     """
 
+    section = "userdirectory"
+
     def read_config(self, config, **kwargs):
         self.user_directory_search_enabled = True
         self.user_directory_search_all_users = False
diff --git a/synapse/config/voip.py b/synapse/config/voip.py
index 2ca0e1cf70..a68a3068aa 100644
--- a/synapse/config/voip.py
+++ b/synapse/config/voip.py
@@ -16,6 +16,8 @@ from ._base import Config
 
 
 class VoipConfig(Config):
+    section = "voip"
+
     def read_config(self, config, **kwargs):
         self.turn_uris = config.get("turn_uris", [])
         self.turn_shared_secret = config.get("turn_shared_secret")
diff --git a/synapse/config/workers.py b/synapse/config/workers.py
index 1ec4998625..fef72ed974 100644
--- a/synapse/config/workers.py
+++ b/synapse/config/workers.py
@@ -21,6 +21,8 @@ class WorkerConfig(Config):
     They have their own pid_file and listener configuration. They use the
     replication_url to talk to the main synapse process."""
 
+    section = "worker"
+
     def read_config(self, config, **kwargs):
         self.worker_app = config.get("worker_app")
 
diff --git a/synapse/federation/federation_server.py b/synapse/federation/federation_server.py
index da06ab379d..21e52c9695 100644
--- a/synapse/federation/federation_server.py
+++ b/synapse/federation/federation_server.py
@@ -36,7 +36,6 @@ from synapse.api.errors import (
     UnsupportedRoomVersionError,
 )
 from synapse.api.room_versions import KNOWN_ROOM_VERSIONS
-from synapse.crypto.event_signing import compute_event_signature
 from synapse.events import room_version_to_event_format
 from synapse.federation.federation_base import FederationBase, event_from_pdu_json
 from synapse.federation.persistence import TransactionActions
@@ -322,18 +321,6 @@ class FederationServer(FederationBase):
         pdus = yield self.handler.get_state_for_pdu(room_id, event_id)
         auth_chain = yield self.store.get_auth_chain([pdu.event_id for pdu in pdus])
 
-        for event in auth_chain:
-            # We sign these again because there was a bug where we
-            # incorrectly signed things the first time round
-            if self.hs.is_mine_id(event.event_id):
-                event.signatures.update(
-                    compute_event_signature(
-                        event.get_pdu_json(),
-                        self.hs.hostname,
-                        self.hs.config.signing_key[0],
-                    )
-                )
-
         return {
             "pdus": [pdu.get_pdu_json() for pdu in pdus],
             "auth_chain": [pdu.get_pdu_json() for pdu in auth_chain],
diff --git a/synapse/federation/sender/__init__.py b/synapse/federation/sender/__init__.py
index d46f4aaeb1..2b2ee8612a 100644
--- a/synapse/federation/sender/__init__.py
+++ b/synapse/federation/sender/__init__.py
@@ -38,7 +38,7 @@ from synapse.metrics import (
     events_processed_counter,
 )
 from synapse.metrics.background_process_metrics import run_as_background_process
-from synapse.util.metrics import measure_func
+from synapse.util.metrics import Measure, measure_func
 
 logger = logging.getLogger(__name__)
 
@@ -183,8 +183,8 @@ class FederationSender(object):
                         # Otherwise if the last member on a server in a room is
                         # banned then it won't receive the event because it won't
                         # be in the room after the ban.
-                        destinations = yield self.state.get_current_hosts_in_room(
-                            event.room_id, latest_event_ids=event.prev_event_ids()
+                        destinations = yield self.state.get_hosts_in_room_at_events(
+                            event.room_id, event_ids=event.prev_event_ids()
                         )
                     except Exception:
                         logger.exception(
@@ -207,8 +207,9 @@ class FederationSender(object):
 
                 @defer.inlineCallbacks
                 def handle_room_events(events):
-                    for event in events:
-                        yield handle_event(event)
+                    with Measure(self.clock, "handle_room_events"):
+                        for event in events:
+                            yield handle_event(event)
 
                 events_by_room = {}
                 for event in events:
diff --git a/synapse/federation/transport/server.py b/synapse/federation/transport/server.py
index 7f8a16e355..0f16f21c2d 100644
--- a/synapse/federation/transport/server.py
+++ b/synapse/federation/transport/server.py
@@ -765,6 +765,10 @@ class PublicRoomList(BaseFederationServlet):
         else:
             network_tuple = ThirdPartyInstanceID(None, None)
 
+        if limit == 0:
+            # zero is a special value which corresponds to no limit.
+            limit = None
+
         data = await maybeDeferred(
             self.handler.get_local_public_room_list,
             limit,
@@ -800,6 +804,10 @@ class PublicRoomList(BaseFederationServlet):
         if search_filter is None:
             logger.warning("Nonefilter")
 
+        if limit == 0:
+            # zero is a special value which corresponds to no limit.
+            limit = None
+
         data = await self.handler.get_local_public_room_list(
             limit=limit,
             since_token=since_token,
diff --git a/synapse/groups/groups_server.py b/synapse/groups/groups_server.py
index d50e691436..8f10b6adbb 100644
--- a/synapse/groups/groups_server.py
+++ b/synapse/groups/groups_server.py
@@ -1,6 +1,7 @@
 # -*- coding: utf-8 -*-
 # Copyright 2017 Vector Creations Ltd
 # Copyright 2018 New Vector Ltd
+# Copyright 2019 Michael Telatynski <7t3chguy@gmail.com>
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -20,16 +21,16 @@ from six import string_types
 
 from twisted.internet import defer
 
-from synapse.api.errors import SynapseError
+from synapse.api.errors import Codes, SynapseError
 from synapse.types import GroupID, RoomID, UserID, get_domain_from_id
 from synapse.util.async_helpers import concurrently_execute
 
 logger = logging.getLogger(__name__)
 
 
-# TODO: Allow users to "knock" or simpkly join depending on rules
+# TODO: Allow users to "knock" or simply join depending on rules
 # TODO: Federation admin APIs
-# TODO: is_priveged flag to users and is_public to users and rooms
+# TODO: is_privileged flag to users and is_public to users and rooms
 # TODO: Audit log for admins (profile updates, membership changes, users who tried
 #       to join but were rejected, etc)
 # TODO: Flairs
@@ -590,7 +591,18 @@ class GroupsServerHandler(object):
         )
 
         # TODO: Check if user knocked
-        # TODO: Check if user is already invited
+
+        invited_users = yield self.store.get_invited_users_in_group(group_id)
+        if user_id in invited_users:
+            raise SynapseError(
+                400, "User already invited to group", errcode=Codes.BAD_STATE
+            )
+
+        user_results = yield self.store.get_users_in_group(
+            group_id, include_private=True
+        )
+        if user_id in [user_result["user_id"] for user_result in user_results]:
+            raise SynapseError(400, "User already in group")
 
         content = {
             "profile": {"name": group["name"], "avatar_url": group["avatar_url"]},
diff --git a/synapse/handlers/deactivate_account.py b/synapse/handlers/deactivate_account.py
index d83912c9a4..63267a0a4c 100644
--- a/synapse/handlers/deactivate_account.py
+++ b/synapse/handlers/deactivate_account.py
@@ -120,6 +120,10 @@ class DeactivateAccountHandler(BaseHandler):
         # parts users from rooms (if it isn't already running)
         self._start_user_parting()
 
+        # Reject all pending invites for the user, so that the user doesn't show up in the
+        # "invited" section of rooms' members list.
+        yield self._reject_pending_invites_for_user(user_id)
+
         # Remove all information on the user from the account_validity table.
         if self._account_validity_enabled:
             yield self.store.delete_account_validity_for_user(user_id)
@@ -129,6 +133,39 @@ class DeactivateAccountHandler(BaseHandler):
 
         return identity_server_supports_unbinding
 
+    @defer.inlineCallbacks
+    def _reject_pending_invites_for_user(self, user_id):
+        """Reject pending invites addressed to a given user ID.
+
+        Args:
+            user_id (str): The user ID to reject pending invites for.
+        """
+        user = UserID.from_string(user_id)
+        pending_invites = yield self.store.get_invited_rooms_for_user(user_id)
+
+        for room in pending_invites:
+            try:
+                yield self._room_member_handler.update_membership(
+                    create_requester(user),
+                    user,
+                    room.room_id,
+                    "leave",
+                    ratelimit=False,
+                    require_consent=False,
+                )
+                logger.info(
+                    "Rejected invite for deactivated user %r in room %r",
+                    user_id,
+                    room.room_id,
+                )
+            except Exception:
+                logger.exception(
+                    "Failed to reject invite for user %r in room %r:"
+                    " ignoring and continuing",
+                    user_id,
+                    room.room_id,
+                )
+
     def _start_user_parting(self):
         """
         Start the process that goes through the table of users
diff --git a/synapse/handlers/e2e_keys.py b/synapse/handlers/e2e_keys.py
index 056fb97acb..0a84d0e2b0 100644
--- a/synapse/handlers/e2e_keys.py
+++ b/synapse/handlers/e2e_keys.py
@@ -248,16 +248,10 @@ class E2eKeysHandler(object):
 
         results = yield self.store.get_e2e_device_keys(local_query)
 
-        # Build the result structure, un-jsonify the results, and add the
-        # "unsigned" section
+        # Build the result structure
         for user_id, device_keys in results.items():
             for device_id, device_info in device_keys.items():
-                r = dict(device_info["keys"])
-                r["unsigned"] = {}
-                display_name = device_info["device_display_name"]
-                if display_name is not None:
-                    r["unsigned"]["device_display_name"] = display_name
-                result_dict[user_id][device_id] = r
+                result_dict[user_id][device_id] = device_info
 
         log_kv(results)
         return result_dict
diff --git a/synapse/handlers/e2e_room_keys.py b/synapse/handlers/e2e_room_keys.py
index a9d80f708c..0cea445f0d 100644
--- a/synapse/handlers/e2e_room_keys.py
+++ b/synapse/handlers/e2e_room_keys.py
@@ -352,8 +352,8 @@ class E2eRoomKeysHandler(object):
             A deferred of an empty dict.
         """
         if "version" not in version_info:
-            raise SynapseError(400, "Missing version in body", Codes.MISSING_PARAM)
-        if version_info["version"] != version:
+            version_info["version"] = version
+        elif version_info["version"] != version:
             raise SynapseError(
                 400, "Version in body does not match", Codes.INVALID_PARAM
             )
diff --git a/synapse/handlers/federation.py b/synapse/handlers/federation.py
index f72b81d419..50fc0fde2a 100644
--- a/synapse/handlers/federation.py
+++ b/synapse/handlers/federation.py
@@ -2570,7 +2570,7 @@ class FederationHandler(BaseHandler):
         )
 
         try:
-            self.auth.check_from_context(room_version, event, context)
+            yield self.auth.check_from_context(room_version, event, context)
         except AuthError as e:
             logger.warn("Denying third party invite %r because %s", event, e)
             raise e
@@ -2599,7 +2599,12 @@ class FederationHandler(BaseHandler):
                 original_invite_id, allow_none=True
             )
         if original_invite:
-            display_name = original_invite.content["display_name"]
+            # If the m.room.third_party_invite event's content is empty, it means the
+            # invite has been revoked. In this case, we don't have to raise an error here
+            # because the auth check will fail on the invite (because it's not able to
+            # fetch public keys from the m.room.third_party_invite event's content, which
+            # is empty).
+            display_name = original_invite.content.get("display_name")
             event_dict["content"]["third_party_invite"]["display_name"] = display_name
         else:
             logger.info(
diff --git a/synapse/handlers/identity.py b/synapse/handlers/identity.py
index 6d42a1aed8..ba99ddf76d 100644
--- a/synapse/handlers/identity.py
+++ b/synapse/handlers/identity.py
@@ -21,11 +21,15 @@ import logging
 import urllib
 
 from canonicaljson import json
+from signedjson.key import decode_verify_key_bytes
+from signedjson.sign import verify_signed_json
+from unpaddedbase64 import decode_base64
 
 from twisted.internet import defer
 from twisted.internet.error import TimeoutError
 
 from synapse.api.errors import (
+    AuthError,
     CodeMessageException,
     Codes,
     HttpResponseException,
@@ -33,12 +37,15 @@ from synapse.api.errors import (
 )
 from synapse.config.emailconfig import ThreepidBehaviour
 from synapse.http.client import SimpleHttpClient
+from synapse.util.hash import sha256_and_url_safe_base64
 from synapse.util.stringutils import random_string
 
 from ._base import BaseHandler
 
 logger = logging.getLogger(__name__)
 
+id_server_scheme = "https://"
+
 
 class IdentityHandler(BaseHandler):
     def __init__(self, hs):
@@ -557,6 +564,352 @@ class IdentityHandler(BaseHandler):
             logger.warning("Error contacting msisdn account_threepid_delegate: %s", e)
             raise SynapseError(400, "Error contacting the identity server")
 
+    @defer.inlineCallbacks
+    def lookup_3pid(self, id_server, medium, address, id_access_token=None):
+        """Looks up a 3pid in the passed identity server.
+
+        Args:
+            id_server (str): The server name (including port, if required)
+                of the identity server to use.
+            medium (str): The type of the third party identifier (e.g. "email").
+            address (str): The third party identifier (e.g. "foo@example.com").
+            id_access_token (str|None): The access token to authenticate to the identity
+                server with
+
+        Returns:
+            str|None: the matrix ID of the 3pid, or None if it is not recognized.
+        """
+        if id_access_token is not None:
+            try:
+                results = yield self._lookup_3pid_v2(
+                    id_server, id_access_token, medium, address
+                )
+                return results
+
+            except Exception as e:
+                # Catch HttpResponseExcept for a non-200 response code
+                # Check if this identity server does not know about v2 lookups
+                if isinstance(e, HttpResponseException) and e.code == 404:
+                    # This is an old identity server that does not yet support v2 lookups
+                    logger.warning(
+                        "Attempted v2 lookup on v1 identity server %s. Falling "
+                        "back to v1",
+                        id_server,
+                    )
+                else:
+                    logger.warning("Error when looking up hashing details: %s", e)
+                    return None
+
+        return (yield self._lookup_3pid_v1(id_server, medium, address))
+
+    @defer.inlineCallbacks
+    def _lookup_3pid_v1(self, id_server, medium, address):
+        """Looks up a 3pid in the passed identity server using v1 lookup.
+
+        Args:
+            id_server (str): The server name (including port, if required)
+                of the identity server to use.
+            medium (str): The type of the third party identifier (e.g. "email").
+            address (str): The third party identifier (e.g. "foo@example.com").
+
+        Returns:
+            str: the matrix ID of the 3pid, or None if it is not recognized.
+        """
+        try:
+            data = yield self.blacklisting_http_client.get_json(
+                "%s%s/_matrix/identity/api/v1/lookup" % (id_server_scheme, id_server),
+                {"medium": medium, "address": address},
+            )
+
+            if "mxid" in data:
+                if "signatures" not in data:
+                    raise AuthError(401, "No signatures on 3pid binding")
+                yield self._verify_any_signature(data, id_server)
+                return data["mxid"]
+        except TimeoutError:
+            raise SynapseError(500, "Timed out contacting identity server")
+        except IOError as e:
+            logger.warning("Error from v1 identity server lookup: %s" % (e,))
+
+        return None
+
+    @defer.inlineCallbacks
+    def _lookup_3pid_v2(self, id_server, id_access_token, medium, address):
+        """Looks up a 3pid in the passed identity server using v2 lookup.
+
+        Args:
+            id_server (str): The server name (including port, if required)
+                of the identity server to use.
+            id_access_token (str): The access token to authenticate to the identity server with
+            medium (str): The type of the third party identifier (e.g. "email").
+            address (str): The third party identifier (e.g. "foo@example.com").
+
+        Returns:
+            Deferred[str|None]: the matrix ID of the 3pid, or None if it is not recognised.
+        """
+        # Check what hashing details are supported by this identity server
+        try:
+            hash_details = yield self.blacklisting_http_client.get_json(
+                "%s%s/_matrix/identity/v2/hash_details" % (id_server_scheme, id_server),
+                {"access_token": id_access_token},
+            )
+        except TimeoutError:
+            raise SynapseError(500, "Timed out contacting identity server")
+
+        if not isinstance(hash_details, dict):
+            logger.warning(
+                "Got non-dict object when checking hash details of %s%s: %s",
+                id_server_scheme,
+                id_server,
+                hash_details,
+            )
+            raise SynapseError(
+                400,
+                "Non-dict object from %s%s during v2 hash_details request: %s"
+                % (id_server_scheme, id_server, hash_details),
+            )
+
+        # Extract information from hash_details
+        supported_lookup_algorithms = hash_details.get("algorithms")
+        lookup_pepper = hash_details.get("lookup_pepper")
+        if (
+            not supported_lookup_algorithms
+            or not isinstance(supported_lookup_algorithms, list)
+            or not lookup_pepper
+            or not isinstance(lookup_pepper, str)
+        ):
+            raise SynapseError(
+                400,
+                "Invalid hash details received from identity server %s%s: %s"
+                % (id_server_scheme, id_server, hash_details),
+            )
+
+        # Check if any of the supported lookup algorithms are present
+        if LookupAlgorithm.SHA256 in supported_lookup_algorithms:
+            # Perform a hashed lookup
+            lookup_algorithm = LookupAlgorithm.SHA256
+
+            # Hash address, medium and the pepper with sha256
+            to_hash = "%s %s %s" % (address, medium, lookup_pepper)
+            lookup_value = sha256_and_url_safe_base64(to_hash)
+
+        elif LookupAlgorithm.NONE in supported_lookup_algorithms:
+            # Perform a non-hashed lookup
+            lookup_algorithm = LookupAlgorithm.NONE
+
+            # Combine together plaintext address and medium
+            lookup_value = "%s %s" % (address, medium)
+
+        else:
+            logger.warning(
+                "None of the provided lookup algorithms of %s are supported: %s",
+                id_server,
+                supported_lookup_algorithms,
+            )
+            raise SynapseError(
+                400,
+                "Provided identity server does not support any v2 lookup "
+                "algorithms that this homeserver supports.",
+            )
+
+        # Authenticate with identity server given the access token from the client
+        headers = {"Authorization": create_id_access_token_header(id_access_token)}
+
+        try:
+            lookup_results = yield self.blacklisting_http_client.post_json_get_json(
+                "%s%s/_matrix/identity/v2/lookup" % (id_server_scheme, id_server),
+                {
+                    "addresses": [lookup_value],
+                    "algorithm": lookup_algorithm,
+                    "pepper": lookup_pepper,
+                },
+                headers=headers,
+            )
+        except TimeoutError:
+            raise SynapseError(500, "Timed out contacting identity server")
+        except Exception as e:
+            logger.warning("Error when performing a v2 3pid lookup: %s", e)
+            raise SynapseError(
+                500, "Unknown error occurred during identity server lookup"
+            )
+
+        # Check for a mapping from what we looked up to an MXID
+        if "mappings" not in lookup_results or not isinstance(
+            lookup_results["mappings"], dict
+        ):
+            logger.warning("No results from 3pid lookup")
+            return None
+
+        # Return the MXID if it's available, or None otherwise
+        mxid = lookup_results["mappings"].get(lookup_value)
+        return mxid
+
+    @defer.inlineCallbacks
+    def _verify_any_signature(self, data, server_hostname):
+        if server_hostname not in data["signatures"]:
+            raise AuthError(401, "No signature from server %s" % (server_hostname,))
+        for key_name, signature in data["signatures"][server_hostname].items():
+            try:
+                key_data = yield self.blacklisting_http_client.get_json(
+                    "%s%s/_matrix/identity/api/v1/pubkey/%s"
+                    % (id_server_scheme, server_hostname, key_name)
+                )
+            except TimeoutError:
+                raise SynapseError(500, "Timed out contacting identity server")
+            if "public_key" not in key_data:
+                raise AuthError(
+                    401, "No public key named %s from %s" % (key_name, server_hostname)
+                )
+            verify_signed_json(
+                data,
+                server_hostname,
+                decode_verify_key_bytes(
+                    key_name, decode_base64(key_data["public_key"])
+                ),
+            )
+            return
+
+    @defer.inlineCallbacks
+    def ask_id_server_for_third_party_invite(
+        self,
+        requester,
+        id_server,
+        medium,
+        address,
+        room_id,
+        inviter_user_id,
+        room_alias,
+        room_avatar_url,
+        room_join_rules,
+        room_name,
+        inviter_display_name,
+        inviter_avatar_url,
+        id_access_token=None,
+    ):
+        """
+        Asks an identity server for a third party invite.
+
+        Args:
+            requester (Requester)
+            id_server (str): hostname + optional port for the identity server.
+            medium (str): The literal string "email".
+            address (str): The third party address being invited.
+            room_id (str): The ID of the room to which the user is invited.
+            inviter_user_id (str): The user ID of the inviter.
+            room_alias (str): An alias for the room, for cosmetic notifications.
+            room_avatar_url (str): The URL of the room's avatar, for cosmetic
+                notifications.
+            room_join_rules (str): The join rules of the email (e.g. "public").
+            room_name (str): The m.room.name of the room.
+            inviter_display_name (str): The current display name of the
+                inviter.
+            inviter_avatar_url (str): The URL of the inviter's avatar.
+            id_access_token (str|None): The access token to authenticate to the identity
+                server with
+
+        Returns:
+            A deferred tuple containing:
+                token (str): The token which must be signed to prove authenticity.
+                public_keys ([{"public_key": str, "key_validity_url": str}]):
+                    public_key is a base64-encoded ed25519 public key.
+                fallback_public_key: One element from public_keys.
+                display_name (str): A user-friendly name to represent the invited
+                    user.
+        """
+        invite_config = {
+            "medium": medium,
+            "address": address,
+            "room_id": room_id,
+            "room_alias": room_alias,
+            "room_avatar_url": room_avatar_url,
+            "room_join_rules": room_join_rules,
+            "room_name": room_name,
+            "sender": inviter_user_id,
+            "sender_display_name": inviter_display_name,
+            "sender_avatar_url": inviter_avatar_url,
+        }
+
+        # Add the identity service access token to the JSON body and use the v2
+        # Identity Service endpoints if id_access_token is present
+        data = None
+        base_url = "%s%s/_matrix/identity" % (id_server_scheme, id_server)
+
+        if id_access_token:
+            key_validity_url = "%s%s/_matrix/identity/v2/pubkey/isvalid" % (
+                id_server_scheme,
+                id_server,
+            )
+
+            # Attempt a v2 lookup
+            url = base_url + "/v2/store-invite"
+            try:
+                data = yield self.blacklisting_http_client.post_json_get_json(
+                    url,
+                    invite_config,
+                    {"Authorization": create_id_access_token_header(id_access_token)},
+                )
+            except TimeoutError:
+                raise SynapseError(500, "Timed out contacting identity server")
+            except HttpResponseException as e:
+                if e.code != 404:
+                    logger.info("Failed to POST %s with JSON: %s", url, e)
+                    raise e
+
+        if data is None:
+            key_validity_url = "%s%s/_matrix/identity/api/v1/pubkey/isvalid" % (
+                id_server_scheme,
+                id_server,
+            )
+            url = base_url + "/api/v1/store-invite"
+
+            try:
+                data = yield self.blacklisting_http_client.post_json_get_json(
+                    url, invite_config
+                )
+            except TimeoutError:
+                raise SynapseError(500, "Timed out contacting identity server")
+            except HttpResponseException as e:
+                logger.warning(
+                    "Error trying to call /store-invite on %s%s: %s",
+                    id_server_scheme,
+                    id_server,
+                    e,
+                )
+
+            if data is None:
+                # Some identity servers may only support application/x-www-form-urlencoded
+                # types. This is especially true with old instances of Sydent, see
+                # https://github.com/matrix-org/sydent/pull/170
+                try:
+                    data = yield self.blacklisting_http_client.post_urlencoded_get_json(
+                        url, invite_config
+                    )
+                except HttpResponseException as e:
+                    logger.warning(
+                        "Error calling /store-invite on %s%s with fallback "
+                        "encoding: %s",
+                        id_server_scheme,
+                        id_server,
+                        e,
+                    )
+                    raise e
+
+        # TODO: Check for success
+        token = data["token"]
+        public_keys = data.get("public_keys", [])
+        if "public_key" in data:
+            fallback_public_key = {
+                "public_key": data["public_key"],
+                "key_validity_url": key_validity_url,
+            }
+        else:
+            fallback_public_key = public_keys[0]
+
+        if not public_keys:
+            public_keys.append(fallback_public_key)
+        display_name = data["display_name"]
+        return token, public_keys, fallback_public_key, display_name
+
 
 def create_id_access_token_header(id_access_token):
     """Create an Authorization header for passing to SimpleHttpClient as the header value
diff --git a/synapse/handlers/presence.py b/synapse/handlers/presence.py
index 053cf66b28..2a5f1a007d 100644
--- a/synapse/handlers/presence.py
+++ b/synapse/handlers/presence.py
@@ -803,17 +803,25 @@ class PresenceHandler(object):
         # Loop round handling deltas until we're up to date
         while True:
             with Measure(self.clock, "presence_delta"):
-                deltas = yield self.store.get_current_state_deltas(self._event_pos)
-                if not deltas:
+                room_max_stream_ordering = self.store.get_room_max_stream_ordering()
+                if self._event_pos == room_max_stream_ordering:
                     return
 
+                logger.debug(
+                    "Processing presence stats %s->%s",
+                    self._event_pos,
+                    room_max_stream_ordering,
+                )
+                max_pos, deltas = yield self.store.get_current_state_deltas(
+                    self._event_pos, room_max_stream_ordering
+                )
                 yield self._handle_state_delta(deltas)
 
-                self._event_pos = deltas[-1]["stream_id"]
+                self._event_pos = max_pos
 
                 # Expose current event processing position to prometheus
                 synapse.metrics.event_processing_positions.labels("presence").set(
-                    self._event_pos
+                    max_pos
                 )
 
     @defer.inlineCallbacks
diff --git a/synapse/handlers/register.py b/synapse/handlers/register.py
index 06bd03b77c..53410f120b 100644
--- a/synapse/handlers/register.py
+++ b/synapse/handlers/register.py
@@ -217,10 +217,9 @@ class RegistrationHandler(BaseHandler):
 
         else:
             # autogen a sequential user ID
-            attempts = 0
             user = None
             while not user:
-                localpart = yield self._generate_user_id(attempts > 0)
+                localpart = yield self._generate_user_id()
                 user = UserID(localpart, self.hs.hostname)
                 user_id = user.to_string()
                 yield self.check_user_id_not_appservice_exclusive(user_id)
@@ -238,7 +237,6 @@ class RegistrationHandler(BaseHandler):
                     # if user id is taken, just generate another
                     user = None
                     user_id = None
-                    attempts += 1
 
         if not self.hs.config.user_consent_at_registration:
             yield self._auto_join_rooms(user_id)
@@ -379,10 +377,10 @@ class RegistrationHandler(BaseHandler):
                 )
 
     @defer.inlineCallbacks
-    def _generate_user_id(self, reseed=False):
-        if reseed or self._next_generated_user_id is None:
+    def _generate_user_id(self):
+        if self._next_generated_user_id is None:
             with (yield self._generate_user_id_linearizer.queue(())):
-                if reseed or self._next_generated_user_id is None:
+                if self._next_generated_user_id is None:
                     self._next_generated_user_id = (
                         yield self.store.find_next_generated_user_id_localpart()
                     )
diff --git a/synapse/handlers/room.py b/synapse/handlers/room.py
index 970be3c846..2816bd8f87 100644
--- a/synapse/handlers/room.py
+++ b/synapse/handlers/room.py
@@ -28,6 +28,7 @@ from twisted.internet import defer
 from synapse.api.constants import EventTypes, JoinRules, RoomCreationPreset
 from synapse.api.errors import AuthError, Codes, NotFoundError, StoreError, SynapseError
 from synapse.api.room_versions import KNOWN_ROOM_VERSIONS
+from synapse.http.endpoint import parse_and_validate_server_name
 from synapse.storage.state import StateFilter
 from synapse.types import RoomAlias, RoomID, RoomStreamToken, StreamToken, UserID
 from synapse.util import stringutils
@@ -554,7 +555,8 @@ class RoomCreationHandler(BaseHandler):
         invite_list = config.get("invite", [])
         for i in invite_list:
             try:
-                UserID.from_string(i)
+                uid = UserID.from_string(i)
+                parse_and_validate_server_name(uid.domain)
             except Exception:
                 raise SynapseError(400, "Invalid user_id: %s" % (i,))
 
diff --git a/synapse/handlers/room_list.py b/synapse/handlers/room_list.py
index a7e55f00e5..c615206df1 100644
--- a/synapse/handlers/room_list.py
+++ b/synapse/handlers/room_list.py
@@ -16,8 +16,7 @@
 import logging
 from collections import namedtuple
 
-from six import PY3, iteritems
-from six.moves import range
+from six import iteritems
 
 import msgpack
 from unpaddedbase64 import decode_base64, encode_base64
@@ -27,7 +26,6 @@ from twisted.internet import defer
 from synapse.api.constants import EventTypes, JoinRules
 from synapse.api.errors import Codes, HttpResponseException
 from synapse.types import ThirdPartyInstanceID
-from synapse.util.async_helpers import concurrently_execute
 from synapse.util.caches.descriptors import cachedInlineCallbacks
 from synapse.util.caches.response_cache import ResponseCache
 
@@ -37,7 +35,6 @@ logger = logging.getLogger(__name__)
 
 REMOTE_ROOM_LIST_POLL_INTERVAL = 60 * 1000
 
-
 # This is used to indicate we should only return rooms published to the main list.
 EMPTY_THIRD_PARTY_ID = ThirdPartyInstanceID(None, None)
 
@@ -72,6 +69,8 @@ class RoomListHandler(BaseHandler):
                 This can be (None, None) to indicate the main list, or a particular
                 appservice and network id to use an appservice specific one.
                 Setting to None returns all public rooms across all lists.
+            from_federation (bool): true iff the request comes from the federation
+                API
         """
         if not self.enable_room_list_search:
             return defer.succeed({"chunk": [], "total_room_count_estimate": 0})
@@ -89,16 +88,8 @@ class RoomListHandler(BaseHandler):
             # appservice specific lists.
             logger.info("Bypassing cache as search request.")
 
-            # XXX: Quick hack to stop room directory queries taking too long.
-            # Timeout request after 60s. Probably want a more fundamental
-            # solution at some point
-            timeout = self.clock.time() + 60
             return self._get_public_room_list(
-                limit,
-                since_token,
-                search_filter,
-                network_tuple=network_tuple,
-                timeout=timeout,
+                limit, since_token, search_filter, network_tuple=network_tuple
             )
 
         key = (limit, since_token, network_tuple)
@@ -119,7 +110,6 @@ class RoomListHandler(BaseHandler):
         search_filter=None,
         network_tuple=EMPTY_THIRD_PARTY_ID,
         from_federation=False,
-        timeout=None,
     ):
         """Generate a public room list.
         Args:
@@ -132,240 +122,116 @@ class RoomListHandler(BaseHandler):
                 Setting to None returns all public rooms across all lists.
             from_federation (bool): Whether this request originated from a
                 federating server or a client. Used for room filtering.
-            timeout (int|None): Amount of seconds to wait for a response before
-                timing out.
         """
-        if since_token and since_token != "END":
-            since_token = RoomListNextBatch.from_token(since_token)
-        else:
-            since_token = None
 
-        rooms_to_order_value = {}
-        rooms_to_num_joined = {}
+        # Pagination tokens work by storing the room ID sent in the last batch,
+        # plus the direction (forwards or backwards). Next batch tokens always
+        # go forwards, prev batch tokens always go backwards.
 
-        newly_visible = []
-        newly_unpublished = []
         if since_token:
-            stream_token = since_token.stream_ordering
-            current_public_id = yield self.store.get_current_public_room_stream_id()
-            public_room_stream_id = since_token.public_room_stream_id
-            newly_visible, newly_unpublished = yield self.store.get_public_room_changes(
-                public_room_stream_id, current_public_id, network_tuple=network_tuple
-            )
-        else:
-            stream_token = yield self.store.get_room_max_stream_ordering()
-            public_room_stream_id = yield self.store.get_current_public_room_stream_id()
-
-        room_ids = yield self.store.get_public_room_ids_at_stream_id(
-            public_room_stream_id, network_tuple=network_tuple
-        )
-
-        # We want to return rooms in a particular order: the number of joined
-        # users. We then arbitrarily use the room_id as a tie breaker.
-
-        @defer.inlineCallbacks
-        def get_order_for_room(room_id):
-            # Most of the rooms won't have changed between the since token and
-            # now (especially if the since token is "now"). So, we can ask what
-            # the current users are in a room (that will hit a cache) and then
-            # check if the room has changed since the since token. (We have to
-            # do it in that order to avoid races).
-            # If things have changed then fall back to getting the current state
-            # at the since token.
-            joined_users = yield self.store.get_users_in_room(room_id)
-            if self.store.has_room_changed_since(room_id, stream_token):
-                latest_event_ids = yield self.store.get_forward_extremeties_for_room(
-                    room_id, stream_token
-                )
-
-                if not latest_event_ids:
-                    return
+            batch_token = RoomListNextBatch.from_token(since_token)
 
-                joined_users = yield self.state_handler.get_current_users_in_room(
-                    room_id, latest_event_ids
-                )
-
-            num_joined_users = len(joined_users)
-            rooms_to_num_joined[room_id] = num_joined_users
+            bounds = (batch_token.last_joined_members, batch_token.last_room_id)
+            forwards = batch_token.direction_is_forward
+        else:
+            batch_token = None
+            bounds = None
 
-            if num_joined_users == 0:
-                return
+            forwards = True
 
-            # We want larger rooms to be first, hence negating num_joined_users
-            rooms_to_order_value[room_id] = (-num_joined_users, room_id)
+        # we request one more than wanted to see if there are more pages to come
+        probing_limit = limit + 1 if limit is not None else None
 
-        logger.info(
-            "Getting ordering for %i rooms since %s", len(room_ids), stream_token
+        results = yield self.store.get_largest_public_rooms(
+            network_tuple,
+            search_filter,
+            probing_limit,
+            bounds=bounds,
+            forwards=forwards,
+            ignore_non_federatable=from_federation,
         )
-        yield concurrently_execute(get_order_for_room, room_ids, 10)
 
-        sorted_entries = sorted(rooms_to_order_value.items(), key=lambda e: e[1])
-        sorted_rooms = [room_id for room_id, _ in sorted_entries]
+        def build_room_entry(room):
+            entry = {
+                "room_id": room["room_id"],
+                "name": room["name"],
+                "topic": room["topic"],
+                "canonical_alias": room["canonical_alias"],
+                "num_joined_members": room["joined_members"],
+                "avatar_url": room["avatar"],
+                "world_readable": room["history_visibility"] == "world_readable",
+                "guest_can_join": room["guest_access"] == "can_join",
+            }
 
-        # `sorted_rooms` should now be a list of all public room ids that is
-        # stable across pagination. Therefore, we can use indices into this
-        # list as our pagination tokens.
+            # Filter out Nones – rather omit the field altogether
+            return {k: v for k, v in entry.items() if v is not None}
 
-        # Filter out rooms that we don't want to return
-        rooms_to_scan = [
-            r
-            for r in sorted_rooms
-            if r not in newly_unpublished and rooms_to_num_joined[r] > 0
-        ]
+        results = [build_room_entry(r) for r in results]
 
-        total_room_count = len(rooms_to_scan)
+        response = {}
+        num_results = len(results)
+        if limit is not None:
+            more_to_come = num_results == probing_limit
 
-        if since_token:
-            # Filter out rooms we've already returned previously
-            # `since_token.current_limit` is the index of the last room we
-            # sent down, so we exclude it and everything before/after it.
-            if since_token.direction_is_forward:
-                rooms_to_scan = rooms_to_scan[since_token.current_limit + 1 :]
+            # Depending on direction we trim either the front or back.
+            if forwards:
+                results = results[:limit]
             else:
-                rooms_to_scan = rooms_to_scan[: since_token.current_limit]
-                rooms_to_scan.reverse()
-
-        logger.info("After sorting and filtering, %i rooms remain", len(rooms_to_scan))
-
-        # _append_room_entry_to_chunk will append to chunk but will stop if
-        # len(chunk) > limit
-        #
-        # Normally we will generate enough results on the first iteration here,
-        #  but if there is a search filter, _append_room_entry_to_chunk may
-        # filter some results out, in which case we loop again.
-        #
-        # We don't want to scan over the entire range either as that
-        # would potentially waste a lot of work.
-        #
-        # XXX if there is no limit, we may end up DoSing the server with
-        # calls to get_current_state_ids for every single room on the
-        # server. Surely we should cap this somehow?
-        #
-        if limit:
-            step = limit + 1
+                results = results[-limit:]
         else:
-            # step cannot be zero
-            step = len(rooms_to_scan) if len(rooms_to_scan) != 0 else 1
-
-        chunk = []
-        for i in range(0, len(rooms_to_scan), step):
-            if timeout and self.clock.time() > timeout:
-                raise Exception("Timed out searching room directory")
-
-            batch = rooms_to_scan[i : i + step]
-            logger.info("Processing %i rooms for result", len(batch))
-            yield concurrently_execute(
-                lambda r: self._append_room_entry_to_chunk(
-                    r,
-                    rooms_to_num_joined[r],
-                    chunk,
-                    limit,
-                    search_filter,
-                    from_federation=from_federation,
-                ),
-                batch,
-                5,
-            )
-            logger.info("Now %i rooms in result", len(chunk))
-            if len(chunk) >= limit + 1:
-                break
-
-        chunk.sort(key=lambda e: (-e["num_joined_members"], e["room_id"]))
-
-        # Work out the new limit of the batch for pagination, or None if we
-        # know there are no more results that would be returned.
-        # i.e., [since_token.current_limit..new_limit] is the batch of rooms
-        # we've returned (or the reverse if we paginated backwards)
-        # We tried to pull out limit + 1 rooms above, so if we have <= limit
-        # then we know there are no more results to return
-        new_limit = None
-        if chunk and (not limit or len(chunk) > limit):
-
-            if not since_token or since_token.direction_is_forward:
-                if limit:
-                    chunk = chunk[:limit]
-                last_room_id = chunk[-1]["room_id"]
+            more_to_come = False
+
+        if num_results > 0:
+            final_entry = results[-1]
+            initial_entry = results[0]
+
+            if forwards:
+                if batch_token:
+                    # If there was a token given then we assume that there
+                    # must be previous results.
+                    response["prev_batch"] = RoomListNextBatch(
+                        last_joined_members=initial_entry["num_joined_members"],
+                        last_room_id=initial_entry["room_id"],
+                        direction_is_forward=False,
+                    ).to_token()
+
+                if more_to_come:
+                    response["next_batch"] = RoomListNextBatch(
+                        last_joined_members=final_entry["num_joined_members"],
+                        last_room_id=final_entry["room_id"],
+                        direction_is_forward=True,
+                    ).to_token()
             else:
-                if limit:
-                    chunk = chunk[-limit:]
-                last_room_id = chunk[0]["room_id"]
-
-            new_limit = sorted_rooms.index(last_room_id)
-
-        results = {"chunk": chunk, "total_room_count_estimate": total_room_count}
-
-        if since_token:
-            results["new_rooms"] = bool(newly_visible)
-
-        if not since_token or since_token.direction_is_forward:
-            if new_limit is not None:
-                results["next_batch"] = RoomListNextBatch(
-                    stream_ordering=stream_token,
-                    public_room_stream_id=public_room_stream_id,
-                    current_limit=new_limit,
-                    direction_is_forward=True,
-                ).to_token()
-
-            if since_token:
-                results["prev_batch"] = since_token.copy_and_replace(
-                    direction_is_forward=False,
-                    current_limit=since_token.current_limit + 1,
-                ).to_token()
-        else:
-            if new_limit is not None:
-                results["prev_batch"] = RoomListNextBatch(
-                    stream_ordering=stream_token,
-                    public_room_stream_id=public_room_stream_id,
-                    current_limit=new_limit,
-                    direction_is_forward=False,
-                ).to_token()
-
-            if since_token:
-                results["next_batch"] = since_token.copy_and_replace(
-                    direction_is_forward=True,
-                    current_limit=since_token.current_limit - 1,
-                ).to_token()
-
-        return results
-
-    @defer.inlineCallbacks
-    def _append_room_entry_to_chunk(
-        self,
-        room_id,
-        num_joined_users,
-        chunk,
-        limit,
-        search_filter,
-        from_federation=False,
-    ):
-        """Generate the entry for a room in the public room list and append it
-        to the `chunk` if it matches the search filter
-
-        Args:
-            room_id (str): The ID of the room.
-            num_joined_users (int): The number of joined users in the room.
-            chunk (list)
-            limit (int|None): Maximum amount of rooms to display. Function will
-                return if length of chunk is greater than limit + 1.
-            search_filter (dict|None)
-            from_federation (bool): Whether this request originated from a
-                federating server or a client. Used for room filtering.
-        """
-        if limit and len(chunk) > limit + 1:
-            # We've already got enough, so lets just drop it.
-            return
+                if batch_token:
+                    response["next_batch"] = RoomListNextBatch(
+                        last_joined_members=final_entry["num_joined_members"],
+                        last_room_id=final_entry["room_id"],
+                        direction_is_forward=True,
+                    ).to_token()
+
+                if more_to_come:
+                    response["prev_batch"] = RoomListNextBatch(
+                        last_joined_members=initial_entry["num_joined_members"],
+                        last_room_id=initial_entry["room_id"],
+                        direction_is_forward=False,
+                    ).to_token()
+
+        for room in results:
+            # populate search result entries with additional fields, namely
+            # 'aliases'
+            room_id = room["room_id"]
+
+            aliases = yield self.store.get_aliases_for_room(room_id)
+            if aliases:
+                room["aliases"] = aliases
 
-        result = yield self.generate_room_entry(room_id, num_joined_users)
-        if not result:
-            return
+        response["chunk"] = results
 
-        if from_federation and not result.get("m.federate", True):
-            # This is a room that other servers cannot join. Do not show them
-            # this room.
-            return
+        response["total_room_count_estimate"] = yield self.store.count_public_rooms(
+            network_tuple, ignore_non_federatable=from_federation
+        )
 
-        if _matches_room_entry(result, search_filter):
-            chunk.append(result)
+        return response
 
     @cachedInlineCallbacks(num_args=1, cache_context=True)
     def generate_room_entry(
@@ -580,18 +446,15 @@ class RoomListNextBatch(
     namedtuple(
         "RoomListNextBatch",
         (
-            "stream_ordering",  # stream_ordering of the first public room list
-            "public_room_stream_id",  # public room stream id for first public room list
-            "current_limit",  # The number of previous rooms returned
+            "last_joined_members",  # The count to get rooms after/before
+            "last_room_id",  # The room_id to get rooms after/before
             "direction_is_forward",  # Bool if this is a next_batch, false if prev_batch
         ),
     )
 ):
-
     KEY_DICT = {
-        "stream_ordering": "s",
-        "public_room_stream_id": "p",
-        "current_limit": "n",
+        "last_joined_members": "m",
+        "last_room_id": "r",
         "direction_is_forward": "d",
     }
 
@@ -599,13 +462,7 @@ class RoomListNextBatch(
 
     @classmethod
     def from_token(cls, token):
-        if PY3:
-            # The argument raw=False is only available on new versions of
-            # msgpack, and only really needed on Python 3. Gate it behind
-            # a PY3 check to avoid causing issues on Debian-packaged versions.
-            decoded = msgpack.loads(decode_base64(token), raw=False)
-        else:
-            decoded = msgpack.loads(decode_base64(token))
+        decoded = msgpack.loads(decode_base64(token), raw=False)
         return RoomListNextBatch(
             **{cls.REVERSE_KEY_DICT[key]: val for key, val in decoded.items()}
         )
diff --git a/synapse/handlers/room_member.py b/synapse/handlers/room_member.py
index 94cd0cf3ef..380e2fad5e 100644
--- a/synapse/handlers/room_member.py
+++ b/synapse/handlers/room_member.py
@@ -20,29 +20,19 @@ import logging
 
 from six.moves import http_client
 
-from signedjson.key import decode_verify_key_bytes
-from signedjson.sign import verify_signed_json
-from unpaddedbase64 import decode_base64
-
 from twisted.internet import defer
-from twisted.internet.error import TimeoutError
 
 from synapse import types
 from synapse.api.constants import EventTypes, Membership
-from synapse.api.errors import AuthError, Codes, HttpResponseException, SynapseError
-from synapse.handlers.identity import LookupAlgorithm, create_id_access_token_header
-from synapse.http.client import SimpleHttpClient
+from synapse.api.errors import AuthError, Codes, SynapseError
 from synapse.types import RoomID, UserID
 from synapse.util.async_helpers import Linearizer
 from synapse.util.distributor import user_joined_room, user_left_room
-from synapse.util.hash import sha256_and_url_safe_base64
 
 from ._base import BaseHandler
 
 logger = logging.getLogger(__name__)
 
-id_server_scheme = "https://"
-
 
 class RoomMemberHandler(object):
     # TODO(paul): This handler currently contains a messy conflation of
@@ -63,14 +53,10 @@ class RoomMemberHandler(object):
         self.auth = hs.get_auth()
         self.state_handler = hs.get_state_handler()
         self.config = hs.config
-        # We create a blacklisting instance of SimpleHttpClient for contacting identity
-        # servers specified by clients
-        self.simple_http_client = SimpleHttpClient(
-            hs, ip_blacklist=hs.config.federation_ip_range_blacklist
-        )
 
         self.federation_handler = hs.get_handlers().federation_handler
         self.directory_handler = hs.get_handlers().directory_handler
+        self.identity_handler = hs.get_handlers().identity_handler
         self.registration_handler = hs.get_registration_handler()
         self.profile_handler = hs.get_profile_handler()
         self.event_creation_handler = hs.get_event_creation_handler()
@@ -217,23 +203,11 @@ class RoomMemberHandler(object):
                 prev_member_event = yield self.store.get_event(prev_member_event_id)
                 newly_joined = prev_member_event.membership != Membership.JOIN
             if newly_joined:
-                yield self._user_joined_room(target, room_id)
-
-            # Copy over direct message status and room tags if this is a join
-            # on an upgraded room
-
-            # Check if this is an upgraded room
-            predecessor = yield self.store.get_room_predecessor(room_id)
-
-            if predecessor:
-                # It is an upgraded room. Copy over old tags
-                self.copy_room_tags_and_direct_to_room(
-                    predecessor["room_id"], room_id, user_id
-                )
-                # Move over old push rules
-                self.store.move_push_rules_from_room_to_room_for_user(
-                    predecessor["room_id"], room_id, user_id
+                # Copy over user state if we're joining an upgraded room
+                yield self.copy_user_state_if_room_upgrade(
+                    room_id, requester.user.to_string()
                 )
+                yield self._user_joined_room(target, room_id)
         elif event.membership == Membership.LEAVE:
             if prev_member_event_id:
                 prev_member_event = yield self.store.get_event(prev_member_event_id)
@@ -477,10 +451,16 @@ class RoomMemberHandler(object):
                 if requester.is_guest:
                     content["kind"] = "guest"
 
-                ret = yield self._remote_join(
+                remote_join_response = yield self._remote_join(
                     requester, remote_room_hosts, room_id, target, content
                 )
-                return ret
+
+                # Copy over user state if this is a join on an remote upgraded room
+                yield self.copy_user_state_if_room_upgrade(
+                    room_id, requester.user.to_string()
+                )
+
+                return remote_join_response
 
         elif effective_membership_state == Membership.LEAVE:
             if not is_host_in_room:
@@ -518,6 +498,38 @@ class RoomMemberHandler(object):
         return res
 
     @defer.inlineCallbacks
+    def copy_user_state_if_room_upgrade(self, new_room_id, user_id):
+        """Copy user-specific information when they join a new room if that new room is the
+        result of a room upgrade
+
+        Args:
+            new_room_id (str): The ID of the room the user is joining
+            user_id (str): The ID of the user
+
+        Returns:
+            Deferred
+        """
+        # Check if the new room is an upgraded room
+        predecessor = yield self.store.get_room_predecessor(new_room_id)
+        if not predecessor:
+            return
+
+        logger.debug(
+            "Found predecessor for %s: %s. Copying over room tags and push " "rules",
+            new_room_id,
+            predecessor,
+        )
+
+        # It is an upgraded room. Copy over old tags
+        yield self.copy_room_tags_and_direct_to_room(
+            predecessor["room_id"], new_room_id, user_id
+        )
+        # Copy over push rules
+        yield self.store.copy_push_rules_from_room_to_room_for_user(
+            predecessor["room_id"], new_room_id, user_id
+        )
+
+    @defer.inlineCallbacks
     def send_membership_event(self, requester, event, context, ratelimit=True):
         """
         Change the membership status of a user in a room.
@@ -682,7 +694,9 @@ class RoomMemberHandler(object):
                 403, "Looking up third-party identifiers is denied from this server"
             )
 
-        invitee = yield self._lookup_3pid(id_server, medium, address, id_access_token)
+        invitee = yield self.identity_handler.lookup_3pid(
+            id_server, medium, address, id_access_token
+        )
 
         if invitee:
             yield self.update_membership(
@@ -701,211 +715,6 @@ class RoomMemberHandler(object):
             )
 
     @defer.inlineCallbacks
-    def _lookup_3pid(self, id_server, medium, address, id_access_token=None):
-        """Looks up a 3pid in the passed identity server.
-
-        Args:
-            id_server (str): The server name (including port, if required)
-                of the identity server to use.
-            medium (str): The type of the third party identifier (e.g. "email").
-            address (str): The third party identifier (e.g. "foo@example.com").
-            id_access_token (str|None): The access token to authenticate to the identity
-                server with
-
-        Returns:
-            str|None: the matrix ID of the 3pid, or None if it is not recognized.
-        """
-        if id_access_token is not None:
-            try:
-                results = yield self._lookup_3pid_v2(
-                    id_server, id_access_token, medium, address
-                )
-                return results
-
-            except Exception as e:
-                # Catch HttpResponseExcept for a non-200 response code
-                # Check if this identity server does not know about v2 lookups
-                if isinstance(e, HttpResponseException) and e.code == 404:
-                    # This is an old identity server that does not yet support v2 lookups
-                    logger.warning(
-                        "Attempted v2 lookup on v1 identity server %s. Falling "
-                        "back to v1",
-                        id_server,
-                    )
-                else:
-                    logger.warning("Error when looking up hashing details: %s", e)
-                    return None
-
-        return (yield self._lookup_3pid_v1(id_server, medium, address))
-
-    @defer.inlineCallbacks
-    def _lookup_3pid_v1(self, id_server, medium, address):
-        """Looks up a 3pid in the passed identity server using v1 lookup.
-
-        Args:
-            id_server (str): The server name (including port, if required)
-                of the identity server to use.
-            medium (str): The type of the third party identifier (e.g. "email").
-            address (str): The third party identifier (e.g. "foo@example.com").
-
-        Returns:
-            str: the matrix ID of the 3pid, or None if it is not recognized.
-        """
-        try:
-            data = yield self.simple_http_client.get_json(
-                "%s%s/_matrix/identity/api/v1/lookup" % (id_server_scheme, id_server),
-                {"medium": medium, "address": address},
-            )
-
-            if "mxid" in data:
-                if "signatures" not in data:
-                    raise AuthError(401, "No signatures on 3pid binding")
-                yield self._verify_any_signature(data, id_server)
-                return data["mxid"]
-        except TimeoutError:
-            raise SynapseError(500, "Timed out contacting identity server")
-        except IOError as e:
-            logger.warning("Error from v1 identity server lookup: %s" % (e,))
-
-        return None
-
-    @defer.inlineCallbacks
-    def _lookup_3pid_v2(self, id_server, id_access_token, medium, address):
-        """Looks up a 3pid in the passed identity server using v2 lookup.
-
-        Args:
-            id_server (str): The server name (including port, if required)
-                of the identity server to use.
-            id_access_token (str): The access token to authenticate to the identity server with
-            medium (str): The type of the third party identifier (e.g. "email").
-            address (str): The third party identifier (e.g. "foo@example.com").
-
-        Returns:
-            Deferred[str|None]: the matrix ID of the 3pid, or None if it is not recognised.
-        """
-        # Check what hashing details are supported by this identity server
-        try:
-            hash_details = yield self.simple_http_client.get_json(
-                "%s%s/_matrix/identity/v2/hash_details" % (id_server_scheme, id_server),
-                {"access_token": id_access_token},
-            )
-        except TimeoutError:
-            raise SynapseError(500, "Timed out contacting identity server")
-
-        if not isinstance(hash_details, dict):
-            logger.warning(
-                "Got non-dict object when checking hash details of %s%s: %s",
-                id_server_scheme,
-                id_server,
-                hash_details,
-            )
-            raise SynapseError(
-                400,
-                "Non-dict object from %s%s during v2 hash_details request: %s"
-                % (id_server_scheme, id_server, hash_details),
-            )
-
-        # Extract information from hash_details
-        supported_lookup_algorithms = hash_details.get("algorithms")
-        lookup_pepper = hash_details.get("lookup_pepper")
-        if (
-            not supported_lookup_algorithms
-            or not isinstance(supported_lookup_algorithms, list)
-            or not lookup_pepper
-            or not isinstance(lookup_pepper, str)
-        ):
-            raise SynapseError(
-                400,
-                "Invalid hash details received from identity server %s%s: %s"
-                % (id_server_scheme, id_server, hash_details),
-            )
-
-        # Check if any of the supported lookup algorithms are present
-        if LookupAlgorithm.SHA256 in supported_lookup_algorithms:
-            # Perform a hashed lookup
-            lookup_algorithm = LookupAlgorithm.SHA256
-
-            # Hash address, medium and the pepper with sha256
-            to_hash = "%s %s %s" % (address, medium, lookup_pepper)
-            lookup_value = sha256_and_url_safe_base64(to_hash)
-
-        elif LookupAlgorithm.NONE in supported_lookup_algorithms:
-            # Perform a non-hashed lookup
-            lookup_algorithm = LookupAlgorithm.NONE
-
-            # Combine together plaintext address and medium
-            lookup_value = "%s %s" % (address, medium)
-
-        else:
-            logger.warning(
-                "None of the provided lookup algorithms of %s are supported: %s",
-                id_server,
-                supported_lookup_algorithms,
-            )
-            raise SynapseError(
-                400,
-                "Provided identity server does not support any v2 lookup "
-                "algorithms that this homeserver supports.",
-            )
-
-        # Authenticate with identity server given the access token from the client
-        headers = {"Authorization": create_id_access_token_header(id_access_token)}
-
-        try:
-            lookup_results = yield self.simple_http_client.post_json_get_json(
-                "%s%s/_matrix/identity/v2/lookup" % (id_server_scheme, id_server),
-                {
-                    "addresses": [lookup_value],
-                    "algorithm": lookup_algorithm,
-                    "pepper": lookup_pepper,
-                },
-                headers=headers,
-            )
-        except TimeoutError:
-            raise SynapseError(500, "Timed out contacting identity server")
-        except Exception as e:
-            logger.warning("Error when performing a v2 3pid lookup: %s", e)
-            raise SynapseError(
-                500, "Unknown error occurred during identity server lookup"
-            )
-
-        # Check for a mapping from what we looked up to an MXID
-        if "mappings" not in lookup_results or not isinstance(
-            lookup_results["mappings"], dict
-        ):
-            logger.warning("No results from 3pid lookup")
-            return None
-
-        # Return the MXID if it's available, or None otherwise
-        mxid = lookup_results["mappings"].get(lookup_value)
-        return mxid
-
-    @defer.inlineCallbacks
-    def _verify_any_signature(self, data, server_hostname):
-        if server_hostname not in data["signatures"]:
-            raise AuthError(401, "No signature from server %s" % (server_hostname,))
-        for key_name, signature in data["signatures"][server_hostname].items():
-            try:
-                key_data = yield self.simple_http_client.get_json(
-                    "%s%s/_matrix/identity/api/v1/pubkey/%s"
-                    % (id_server_scheme, server_hostname, key_name)
-                )
-            except TimeoutError:
-                raise SynapseError(500, "Timed out contacting identity server")
-            if "public_key" not in key_data:
-                raise AuthError(
-                    401, "No public key named %s from %s" % (key_name, server_hostname)
-                )
-            verify_signed_json(
-                data,
-                server_hostname,
-                decode_verify_key_bytes(
-                    key_name, decode_base64(key_data["public_key"])
-                ),
-            )
-            return
-
-    @defer.inlineCallbacks
     def _make_and_store_3pid_invite(
         self,
         requester,
@@ -951,7 +760,7 @@ class RoomMemberHandler(object):
             room_avatar_url = room_avatar_event.content.get("url", "")
 
         token, public_keys, fallback_public_key, display_name = (
-            yield self._ask_id_server_for_third_party_invite(
+            yield self.identity_handler.ask_id_server_for_third_party_invite(
                 requester=requester,
                 id_server=id_server,
                 medium=medium,
@@ -988,147 +797,6 @@ class RoomMemberHandler(object):
         )
 
     @defer.inlineCallbacks
-    def _ask_id_server_for_third_party_invite(
-        self,
-        requester,
-        id_server,
-        medium,
-        address,
-        room_id,
-        inviter_user_id,
-        room_alias,
-        room_avatar_url,
-        room_join_rules,
-        room_name,
-        inviter_display_name,
-        inviter_avatar_url,
-        id_access_token=None,
-    ):
-        """
-        Asks an identity server for a third party invite.
-
-        Args:
-            requester (Requester)
-            id_server (str): hostname + optional port for the identity server.
-            medium (str): The literal string "email".
-            address (str): The third party address being invited.
-            room_id (str): The ID of the room to which the user is invited.
-            inviter_user_id (str): The user ID of the inviter.
-            room_alias (str): An alias for the room, for cosmetic notifications.
-            room_avatar_url (str): The URL of the room's avatar, for cosmetic
-                notifications.
-            room_join_rules (str): The join rules of the email (e.g. "public").
-            room_name (str): The m.room.name of the room.
-            inviter_display_name (str): The current display name of the
-                inviter.
-            inviter_avatar_url (str): The URL of the inviter's avatar.
-            id_access_token (str|None): The access token to authenticate to the identity
-                server with
-
-        Returns:
-            A deferred tuple containing:
-                token (str): The token which must be signed to prove authenticity.
-                public_keys ([{"public_key": str, "key_validity_url": str}]):
-                    public_key is a base64-encoded ed25519 public key.
-                fallback_public_key: One element from public_keys.
-                display_name (str): A user-friendly name to represent the invited
-                    user.
-        """
-        invite_config = {
-            "medium": medium,
-            "address": address,
-            "room_id": room_id,
-            "room_alias": room_alias,
-            "room_avatar_url": room_avatar_url,
-            "room_join_rules": room_join_rules,
-            "room_name": room_name,
-            "sender": inviter_user_id,
-            "sender_display_name": inviter_display_name,
-            "sender_avatar_url": inviter_avatar_url,
-        }
-
-        # Add the identity service access token to the JSON body and use the v2
-        # Identity Service endpoints if id_access_token is present
-        data = None
-        base_url = "%s%s/_matrix/identity" % (id_server_scheme, id_server)
-
-        if id_access_token:
-            key_validity_url = "%s%s/_matrix/identity/v2/pubkey/isvalid" % (
-                id_server_scheme,
-                id_server,
-            )
-
-            # Attempt a v2 lookup
-            url = base_url + "/v2/store-invite"
-            try:
-                data = yield self.simple_http_client.post_json_get_json(
-                    url,
-                    invite_config,
-                    {"Authorization": create_id_access_token_header(id_access_token)},
-                )
-            except TimeoutError:
-                raise SynapseError(500, "Timed out contacting identity server")
-            except HttpResponseException as e:
-                if e.code != 404:
-                    logger.info("Failed to POST %s with JSON: %s", url, e)
-                    raise e
-
-        if data is None:
-            key_validity_url = "%s%s/_matrix/identity/api/v1/pubkey/isvalid" % (
-                id_server_scheme,
-                id_server,
-            )
-            url = base_url + "/api/v1/store-invite"
-
-            try:
-                data = yield self.simple_http_client.post_json_get_json(
-                    url, invite_config
-                )
-            except TimeoutError:
-                raise SynapseError(500, "Timed out contacting identity server")
-            except HttpResponseException as e:
-                logger.warning(
-                    "Error trying to call /store-invite on %s%s: %s",
-                    id_server_scheme,
-                    id_server,
-                    e,
-                )
-
-            if data is None:
-                # Some identity servers may only support application/x-www-form-urlencoded
-                # types. This is especially true with old instances of Sydent, see
-                # https://github.com/matrix-org/sydent/pull/170
-                try:
-                    data = yield self.simple_http_client.post_urlencoded_get_json(
-                        url, invite_config
-                    )
-                except HttpResponseException as e:
-                    logger.warning(
-                        "Error calling /store-invite on %s%s with fallback "
-                        "encoding: %s",
-                        id_server_scheme,
-                        id_server,
-                        e,
-                    )
-                    raise e
-
-        # TODO: Check for success
-        token = data["token"]
-        public_keys = data.get("public_keys", [])
-        if "public_key" in data:
-            fallback_public_key = {
-                "public_key": data["public_key"],
-                "key_validity_url": key_validity_url,
-            }
-        else:
-            fallback_public_key = public_keys[0]
-
-        if not public_keys:
-            public_keys.append(fallback_public_key)
-        display_name = data["display_name"]
-        return token, public_keys, fallback_public_key, display_name
-
-    @defer.inlineCallbacks
     def _is_host_in_room(self, current_state_ids):
         # Have we just created the room, and is this about to be the very
         # first member event?
diff --git a/synapse/handlers/stats.py b/synapse/handlers/stats.py
index cbac7c347a..466daf9202 100644
--- a/synapse/handlers/stats.py
+++ b/synapse/handlers/stats.py
@@ -87,21 +87,23 @@ class StatsHandler(StateDeltasHandler):
             # Be sure to read the max stream_ordering *before* checking if there are any outstanding
             # deltas, since there is otherwise a chance that we could miss updates which arrive
             # after we check the deltas.
-            room_max_stream_ordering = yield self.store.get_room_max_stream_ordering()
+            room_max_stream_ordering = self.store.get_room_max_stream_ordering()
             if self.pos == room_max_stream_ordering:
                 break
 
-            deltas = yield self.store.get_current_state_deltas(self.pos)
+            logger.debug(
+                "Processing room stats %s->%s", self.pos, room_max_stream_ordering
+            )
+            max_pos, deltas = yield self.store.get_current_state_deltas(
+                self.pos, room_max_stream_ordering
+            )
 
             if deltas:
                 logger.debug("Handling %d state deltas", len(deltas))
                 room_deltas, user_deltas = yield self._handle_deltas(deltas)
-
-                max_pos = deltas[-1]["stream_id"]
             else:
                 room_deltas = {}
                 user_deltas = {}
-                max_pos = room_max_stream_ordering
 
             # Then count deltas for total_events and total_event_bytes.
             room_count, user_count = yield self.store.get_changes_room_total_events_and_bytes(
@@ -293,6 +295,7 @@ class StatsHandler(StateDeltasHandler):
                 room_state["guest_access"] = event_content.get("guest_access")
 
         for room_id, state in room_to_state_updates.items():
+            logger.info("Updating room_stats_state for %s: %s", room_id, state)
             yield self.store.update_room_state(room_id, state)
 
         return room_to_stats_deltas, user_to_stats_deltas
diff --git a/synapse/handlers/user_directory.py b/synapse/handlers/user_directory.py
index e53669e40d..624f05ab5b 100644
--- a/synapse/handlers/user_directory.py
+++ b/synapse/handlers/user_directory.py
@@ -138,21 +138,28 @@ class UserDirectoryHandler(StateDeltasHandler):
         # Loop round handling deltas until we're up to date
         while True:
             with Measure(self.clock, "user_dir_delta"):
-                deltas = yield self.store.get_current_state_deltas(self.pos)
-                if not deltas:
+                room_max_stream_ordering = self.store.get_room_max_stream_ordering()
+                if self.pos == room_max_stream_ordering:
                     return
 
+                logger.debug(
+                    "Processing user stats %s->%s", self.pos, room_max_stream_ordering
+                )
+                max_pos, deltas = yield self.store.get_current_state_deltas(
+                    self.pos, room_max_stream_ordering
+                )
+
                 logger.info("Handling %d state deltas", len(deltas))
                 yield self._handle_deltas(deltas)
 
-                self.pos = deltas[-1]["stream_id"]
+                self.pos = max_pos
 
                 # Expose current event processing position to prometheus
                 synapse.metrics.event_processing_positions.labels("user_dir").set(
-                    self.pos
+                    max_pos
                 )
 
-                yield self.store.update_user_directory_stream_pos(self.pos)
+                yield self.store.update_user_directory_stream_pos(max_pos)
 
     @defer.inlineCallbacks
     def _handle_deltas(self, deltas):
diff --git a/synapse/http/client.py b/synapse/http/client.py
index 51765ae3c0..cdf828a4ff 100644
--- a/synapse/http/client.py
+++ b/synapse/http/client.py
@@ -327,7 +327,7 @@ class SimpleHttpClient(object):
         Args:
             uri (str):
             args (dict[str, str|List[str]]): query params
-            headers (dict[str, List[str]]|None): If not None, a map from
+            headers (dict[str|bytes, List[str|bytes]]|None): If not None, a map from
                header name to a list of values for that header
 
         Returns:
@@ -371,7 +371,7 @@ class SimpleHttpClient(object):
         Args:
             uri (str):
             post_json (object):
-            headers (dict[str, List[str]]|None): If not None, a map from
+            headers (dict[str|bytes, List[str|bytes]]|None): If not None, a map from
                header name to a list of values for that header
 
         Returns:
@@ -414,7 +414,7 @@ class SimpleHttpClient(object):
                 None.
                 **Note**: The value of each key is assumed to be an iterable
                 and *not* a string.
-            headers (dict[str, List[str]]|None): If not None, a map from
+            headers (dict[str|bytes, List[str|bytes]]|None): If not None, a map from
                header name to a list of values for that header
         Returns:
             Deferred: Succeeds when we get *any* 2xx HTTP response, with the
@@ -438,7 +438,7 @@ class SimpleHttpClient(object):
                 None.
                 **Note**: The value of each key is assumed to be an iterable
                 and *not* a string.
-            headers (dict[str, List[str]]|None): If not None, a map from
+            headers (dict[str|bytes, List[str|bytes]]|None): If not None, a map from
                header name to a list of values for that header
         Returns:
             Deferred: Succeeds when we get *any* 2xx HTTP response, with the
@@ -482,7 +482,7 @@ class SimpleHttpClient(object):
                 None.
                 **Note**: The value of each key is assumed to be an iterable
                 and *not* a string.
-            headers (dict[str, List[str]]|None): If not None, a map from
+            headers (dict[str|bytes, List[str|bytes]]|None): If not None, a map from
                header name to a list of values for that header
         Returns:
             Deferred: Succeeds when we get *any* 2xx HTTP response, with the
@@ -516,7 +516,7 @@ class SimpleHttpClient(object):
         Args:
             url (str): The URL to GET
             output_stream (file): File to write the response body to.
-            headers (dict[str, List[str]]|None): If not None, a map from
+            headers (dict[str|bytes, List[str|bytes]]|None): If not None, a map from
                header name to a list of values for that header
         Returns:
             A (int,dict,string,int) tuple of the file length, dict of the response
diff --git a/synapse/http/server.py b/synapse/http/server.py
index cb9158fe1b..2ccb210fd6 100644
--- a/synapse/http/server.py
+++ b/synapse/http/server.py
@@ -388,7 +388,7 @@ class DirectServeResource(resource.Resource):
         if not callback:
             return super().render(request)
 
-        resp = callback(request)
+        resp = trace_servlet(self.__class__.__name__)(callback)(request)
 
         # If it's a coroutine, turn it into a Deferred
         if isinstance(resp, types.CoroutineType):
diff --git a/synapse/logging/opentracing.py b/synapse/logging/opentracing.py
index 308a27213b..0638cec429 100644
--- a/synapse/logging/opentracing.py
+++ b/synapse/logging/opentracing.py
@@ -169,7 +169,9 @@ import contextlib
 import inspect
 import logging
 import re
+import types
 from functools import wraps
+from typing import Dict
 
 from canonicaljson import json
 
@@ -547,7 +549,7 @@ def inject_active_span_twisted_headers(headers, destination, check_destination=T
         return
 
     span = opentracing.tracer.active_span
-    carrier = {}
+    carrier = {}  # type: Dict[str, str]
     opentracing.tracer.inject(span, opentracing.Format.HTTP_HEADERS, carrier)
 
     for key, value in carrier.items():
@@ -584,7 +586,7 @@ def inject_active_span_byte_dict(headers, destination, check_destination=True):
 
     span = opentracing.tracer.active_span
 
-    carrier = {}
+    carrier = {}  # type: Dict[str, str]
     opentracing.tracer.inject(span, opentracing.Format.HTTP_HEADERS, carrier)
 
     for key, value in carrier.items():
@@ -639,7 +641,7 @@ def get_active_span_text_map(destination=None):
     if destination and not whitelisted_homeserver(destination):
         return {}
 
-    carrier = {}
+    carrier = {}  # type: Dict[str, str]
     opentracing.tracer.inject(
         opentracing.tracer.active_span, opentracing.Format.TEXT_MAP, carrier
     )
@@ -653,7 +655,7 @@ def active_span_context_as_string():
     Returns:
         The active span context encoded as a string.
     """
-    carrier = {}
+    carrier = {}  # type: Dict[str, str]
     if opentracing:
         opentracing.tracer.inject(
             opentracing.tracer.active_span, opentracing.Format.TEXT_MAP, carrier
@@ -777,8 +779,7 @@ def trace_servlet(servlet_name, extract_context=False):
             return func
 
         @wraps(func)
-        @defer.inlineCallbacks
-        def _trace_servlet_inner(request, *args, **kwargs):
+        async def _trace_servlet_inner(request, *args, **kwargs):
             request_tags = {
                 "request_id": request.get_request_id(),
                 tags.SPAN_KIND: tags.SPAN_KIND_RPC_SERVER,
@@ -795,8 +796,14 @@ def trace_servlet(servlet_name, extract_context=False):
                 scope = start_active_span(servlet_name, tags=request_tags)
 
             with scope:
-                result = yield defer.maybeDeferred(func, request, *args, **kwargs)
-                return result
+                result = func(request, *args, **kwargs)
+
+                if not isinstance(result, (types.CoroutineType, defer.Deferred)):
+                    # Some servlets aren't async and just return results
+                    # directly, so we handle that here.
+                    return result
+
+                return await result
 
         return _trace_servlet_inner
 
diff --git a/synapse/logging/utils.py b/synapse/logging/utils.py
index 7df0fa6087..6073fc2725 100644
--- a/synapse/logging/utils.py
+++ b/synapse/logging/utils.py
@@ -119,7 +119,11 @@ def trace_function(f):
         logger = logging.getLogger(name)
         level = logging.DEBUG
 
-        s = inspect.currentframe().f_back
+        frame = inspect.currentframe()
+        if frame is None:
+            raise Exception("Can't get current frame!")
+
+        s = frame.f_back
 
         to_print = [
             "\t%s:%s %s. Args: args=%s, kwargs=%s"
@@ -144,7 +148,7 @@ def trace_function(f):
             pathname=pathname,
             lineno=lineno,
             msg=msg,
-            args=None,
+            args=tuple(),
             exc_info=None,
         )
 
@@ -157,7 +161,12 @@ def trace_function(f):
 
 
 def get_previous_frames():
-    s = inspect.currentframe().f_back.f_back
+
+    frame = inspect.currentframe()
+    if frame is None:
+        raise Exception("Can't get current frame!")
+
+    s = frame.f_back.f_back
     to_return = []
     while s:
         if s.f_globals["__name__"].startswith("synapse"):
@@ -174,7 +183,10 @@ def get_previous_frames():
 
 
 def get_previous_frame(ignore=[]):
-    s = inspect.currentframe().f_back.f_back
+    frame = inspect.currentframe()
+    if frame is None:
+        raise Exception("Can't get current frame!")
+    s = frame.f_back.f_back
 
     while s:
         if s.f_globals["__name__"].startswith("synapse"):
diff --git a/synapse/metrics/__init__.py b/synapse/metrics/__init__.py
index bec3b13397..0b45e1f52a 100644
--- a/synapse/metrics/__init__.py
+++ b/synapse/metrics/__init__.py
@@ -125,7 +125,7 @@ class InFlightGauge(object):
         )
 
         # Counts number of in flight blocks for a given set of label values
-        self._registrations = {}
+        self._registrations = {}  # type: Dict
 
         # Protects access to _registrations
         self._lock = threading.Lock()
@@ -226,7 +226,7 @@ class BucketCollector(object):
         # Fetch the data -- this must be synchronous!
         data = self.data_collector()
 
-        buckets = {}
+        buckets = {}  # type: Dict[float, int]
 
         res = []
         for x in data.keys():
diff --git a/synapse/metrics/_exposition.py b/synapse/metrics/_exposition.py
index 74d9c3ecd3..a248103191 100644
--- a/synapse/metrics/_exposition.py
+++ b/synapse/metrics/_exposition.py
@@ -36,9 +36,9 @@ from twisted.web.resource import Resource
 try:
     from prometheus_client.samples import Sample
 except ImportError:
-    Sample = namedtuple(
+    Sample = namedtuple(  # type: ignore[no-redef] # noqa
         "Sample", ["name", "labels", "value", "timestamp", "exemplar"]
-    )  # type: ignore
+    )
 
 
 CONTENT_TYPE_LATEST = str("text/plain; version=0.0.4; charset=utf-8")
diff --git a/synapse/python_dependencies.py b/synapse/python_dependencies.py
index 0bd563edc7..aa7da1c543 100644
--- a/synapse/python_dependencies.py
+++ b/synapse/python_dependencies.py
@@ -15,7 +15,7 @@
 # limitations under the License.
 
 import logging
-from typing import Set
+from typing import List, Set
 
 from pkg_resources import (
     DistributionNotFound,
@@ -73,6 +73,7 @@ REQUIREMENTS = [
     "netaddr>=0.7.18",
     "Jinja2>=2.9",
     "bleach>=1.4.3",
+    "typing-extensions>=3.7.4",
 ]
 
 CONDITIONAL_REQUIREMENTS = {
@@ -144,7 +145,11 @@ def check_requirements(for_feature=None):
             deps_needed.append(dependency)
             errors.append(
                 "Needed %s, got %s==%s"
-                % (dependency, e.dist.project_name, e.dist.version)
+                % (
+                    dependency,
+                    e.dist.project_name,  # type: ignore[attr-defined] # noqa
+                    e.dist.version,  # type: ignore[attr-defined] # noqa
+                )
             )
         except DistributionNotFound:
             deps_needed.append(dependency)
@@ -159,7 +164,7 @@ def check_requirements(for_feature=None):
     if not for_feature:
         # Check the optional dependencies are up to date. We allow them to not be
         # installed.
-        OPTS = sum(CONDITIONAL_REQUIREMENTS.values(), [])
+        OPTS = sum(CONDITIONAL_REQUIREMENTS.values(), [])  # type: List[str]
 
         for dependency in OPTS:
             try:
@@ -168,7 +173,11 @@ def check_requirements(for_feature=None):
                 deps_needed.append(dependency)
                 errors.append(
                     "Needed optional %s, got %s==%s"
-                    % (dependency, e.dist.project_name, e.dist.version)
+                    % (
+                        dependency,
+                        e.dist.project_name,  # type: ignore[attr-defined] # noqa
+                        e.dist.version,  # type: ignore[attr-defined] # noqa
+                    )
                 )
             except DistributionNotFound:
                 # If it's not found, we don't care
diff --git a/synapse/rest/client/v1/login.py b/synapse/rest/client/v1/login.py
index 9cddbc752a..8414af08cb 100644
--- a/synapse/rest/client/v1/login.py
+++ b/synapse/rest/client/v1/login.py
@@ -377,6 +377,7 @@ class CasTicketServlet(RestServlet):
         super(CasTicketServlet, self).__init__()
         self.cas_server_url = hs.config.cas_server_url
         self.cas_service_url = hs.config.cas_service_url
+        self.cas_displayname_attribute = hs.config.cas_displayname_attribute
         self.cas_required_attributes = hs.config.cas_required_attributes
         self._sso_auth_handler = SSOAuthHandler(hs)
         self._http_client = hs.get_simple_http_client()
@@ -400,6 +401,7 @@ class CasTicketServlet(RestServlet):
 
     def handle_cas_response(self, request, cas_response_body, client_redirect_url):
         user, attributes = self.parse_cas_response(cas_response_body)
+        displayname = attributes.pop(self.cas_displayname_attribute, None)
 
         for required_attribute, required_value in self.cas_required_attributes.items():
             # If required attribute was not in CAS Response - Forbidden
@@ -414,7 +416,7 @@ class CasTicketServlet(RestServlet):
                     raise LoginError(401, "Unauthorized", errcode=Codes.UNAUTHORIZED)
 
         return self._sso_auth_handler.on_successful_auth(
-            user, request, client_redirect_url
+            user, request, client_redirect_url, displayname
         )
 
     def parse_cas_response(self, cas_response_body):
diff --git a/synapse/rest/client/v1/room.py b/synapse/rest/client/v1/room.py
index a6a7b3b57e..9c1d41421c 100644
--- a/synapse/rest/client/v1/room.py
+++ b/synapse/rest/client/v1/room.py
@@ -39,6 +39,7 @@ from synapse.http.servlet import (
     parse_json_object_from_request,
     parse_string,
 )
+from synapse.logging.opentracing import set_tag
 from synapse.rest.client.transactions import HttpTransactionCache
 from synapse.rest.client.v2_alpha._base import client_patterns
 from synapse.storage.state import StateFilter
@@ -81,6 +82,7 @@ class RoomCreateRestServlet(TransactionRestServlet):
         )
 
     def on_PUT(self, request, txn_id):
+        set_tag("txn_id", txn_id)
         return self.txns.fetch_or_execute_request(request, self.on_POST, request)
 
     @defer.inlineCallbacks
@@ -181,6 +183,9 @@ class RoomStateEventRestServlet(TransactionRestServlet):
     def on_PUT(self, request, room_id, event_type, state_key, txn_id=None):
         requester = yield self.auth.get_user_by_req(request)
 
+        if txn_id:
+            set_tag("txn_id", txn_id)
+
         content = parse_json_object_from_request(request)
 
         event_dict = {
@@ -209,6 +214,7 @@ class RoomStateEventRestServlet(TransactionRestServlet):
 
         ret = {}
         if event:
+            set_tag("event_id", event.event_id)
             ret = {"event_id": event.event_id}
         return 200, ret
 
@@ -244,12 +250,15 @@ class RoomSendEventRestServlet(TransactionRestServlet):
             requester, event_dict, txn_id=txn_id
         )
 
+        set_tag("event_id", event.event_id)
         return 200, {"event_id": event.event_id}
 
     def on_GET(self, request, room_id, event_type, txn_id):
         return 200, "Not implemented"
 
     def on_PUT(self, request, room_id, event_type, txn_id):
+        set_tag("txn_id", txn_id)
+
         return self.txns.fetch_or_execute_request(
             request, self.on_POST, request, room_id, event_type, txn_id
         )
@@ -310,6 +319,8 @@ class JoinRoomAliasServlet(TransactionRestServlet):
         return 200, {"room_id": room_id}
 
     def on_PUT(self, request, room_identifier, txn_id):
+        set_tag("txn_id", txn_id)
+
         return self.txns.fetch_or_execute_request(
             request, self.on_POST, request, room_identifier, txn_id
         )
@@ -350,6 +361,10 @@ class PublicRoomListRestServlet(TransactionRestServlet):
         limit = parse_integer(request, "limit", 0)
         since_token = parse_string(request, "since", None)
 
+        if limit == 0:
+            # zero is a special value which corresponds to no limit.
+            limit = None
+
         handler = self.hs.get_room_list_handler()
         if server:
             data = yield handler.get_remote_public_room_list(
@@ -387,6 +402,10 @@ class PublicRoomListRestServlet(TransactionRestServlet):
         else:
             network_tuple = ThirdPartyInstanceID.from_string(third_party_instance_id)
 
+        if limit == 0:
+            # zero is a special value which corresponds to no limit.
+            limit = None
+
         handler = self.hs.get_room_list_handler()
         if server:
             data = yield handler.get_remote_public_room_list(
@@ -655,6 +674,8 @@ class RoomForgetRestServlet(TransactionRestServlet):
         return 200, {}
 
     def on_PUT(self, request, room_id, txn_id):
+        set_tag("txn_id", txn_id)
+
         return self.txns.fetch_or_execute_request(
             request, self.on_POST, request, room_id, txn_id
         )
@@ -738,6 +759,8 @@ class RoomMembershipRestServlet(TransactionRestServlet):
         return True
 
     def on_PUT(self, request, room_id, membership_action, txn_id):
+        set_tag("txn_id", txn_id)
+
         return self.txns.fetch_or_execute_request(
             request, self.on_POST, request, room_id, membership_action, txn_id
         )
@@ -771,9 +794,12 @@ class RoomRedactEventRestServlet(TransactionRestServlet):
             txn_id=txn_id,
         )
 
+        set_tag("event_id", event.event_id)
         return 200, {"event_id": event.event_id}
 
     def on_PUT(self, request, room_id, event_id, txn_id):
+        set_tag("txn_id", txn_id)
+
         return self.txns.fetch_or_execute_request(
             request, self.on_POST, request, room_id, event_id, txn_id
         )
diff --git a/synapse/rest/client/v2_alpha/account.py b/synapse/rest/client/v2_alpha/account.py
index f99676fd30..80cf7126a0 100644
--- a/synapse/rest/client/v2_alpha/account.py
+++ b/synapse/rest/client/v2_alpha/account.py
@@ -129,66 +129,6 @@ class EmailPasswordRequestTokenRestServlet(RestServlet):
         return 200, ret
 
 
-class MsisdnPasswordRequestTokenRestServlet(RestServlet):
-    PATTERNS = client_patterns("/account/password/msisdn/requestToken$")
-
-    def __init__(self, hs):
-        super(MsisdnPasswordRequestTokenRestServlet, self).__init__()
-        self.hs = hs
-        self.datastore = self.hs.get_datastore()
-        self.identity_handler = hs.get_handlers().identity_handler
-
-    @defer.inlineCallbacks
-    def on_POST(self, request):
-        body = parse_json_object_from_request(request)
-
-        assert_params_in_dict(
-            body, ["client_secret", "country", "phone_number", "send_attempt"]
-        )
-        client_secret = body["client_secret"]
-        country = body["country"]
-        phone_number = body["phone_number"]
-        send_attempt = body["send_attempt"]
-        next_link = body.get("next_link")  # Optional param
-
-        msisdn = phone_number_to_msisdn(country, phone_number)
-
-        if not check_3pid_allowed(self.hs, "msisdn", msisdn):
-            raise SynapseError(
-                403,
-                "Account phone numbers are not authorized on this server",
-                Codes.THREEPID_DENIED,
-            )
-
-        existing_user_id = yield self.datastore.get_user_id_by_threepid(
-            "msisdn", msisdn
-        )
-
-        if existing_user_id is None:
-            raise SynapseError(400, "MSISDN not found", Codes.THREEPID_NOT_FOUND)
-
-        if not self.hs.config.account_threepid_delegate_msisdn:
-            logger.warn(
-                "No upstream msisdn account_threepid_delegate configured on the server to "
-                "handle this request"
-            )
-            raise SynapseError(
-                400,
-                "Password reset by phone number is not supported on this homeserver",
-            )
-
-        ret = yield self.identity_handler.requestMsisdnToken(
-            self.hs.config.account_threepid_delegate_msisdn,
-            country,
-            phone_number,
-            client_secret,
-            send_attempt,
-            next_link,
-        )
-
-        return 200, ret
-
-
 class PasswordResetSubmitTokenServlet(RestServlet):
     """Handles 3PID validation token submission"""
 
@@ -301,9 +241,7 @@ class PasswordRestServlet(RestServlet):
         else:
             requester = None
             result, params, _ = yield self.auth_handler.check_auth(
-                [[LoginType.EMAIL_IDENTITY], [LoginType.MSISDN]],
-                body,
-                self.hs.get_ip_from_request(request),
+                [[LoginType.EMAIL_IDENTITY]], body, self.hs.get_ip_from_request(request)
             )
 
             if LoginType.EMAIL_IDENTITY in result:
@@ -843,7 +781,6 @@ class WhoamiRestServlet(RestServlet):
 
 def register_servlets(hs, http_server):
     EmailPasswordRequestTokenRestServlet(hs).register(http_server)
-    MsisdnPasswordRequestTokenRestServlet(hs).register(http_server)
     PasswordResetSubmitTokenServlet(hs).register(http_server)
     PasswordRestServlet(hs).register(http_server)
     DeactivateAccountRestServlet(hs).register(http_server)
diff --git a/synapse/rest/client/v2_alpha/filter.py b/synapse/rest/client/v2_alpha/filter.py
index c6ddf24c8d..17a8bc7366 100644
--- a/synapse/rest/client/v2_alpha/filter.py
+++ b/synapse/rest/client/v2_alpha/filter.py
@@ -17,7 +17,7 @@ import logging
 
 from twisted.internet import defer
 
-from synapse.api.errors import AuthError, Codes, StoreError, SynapseError
+from synapse.api.errors import AuthError, NotFoundError, StoreError, SynapseError
 from synapse.http.servlet import RestServlet, parse_json_object_from_request
 from synapse.types import UserID
 
@@ -52,13 +52,15 @@ class GetFilterRestServlet(RestServlet):
             raise SynapseError(400, "Invalid filter_id")
 
         try:
-            filter = yield self.filtering.get_user_filter(
+            filter_collection = yield self.filtering.get_user_filter(
                 user_localpart=target_user.localpart, filter_id=filter_id
             )
+        except StoreError as e:
+            if e.code != 404:
+                raise
+            raise NotFoundError("No such filter")
 
-            return 200, filter.get_filter_json()
-        except (KeyError, StoreError):
-            raise SynapseError(400, "No such filter", errcode=Codes.NOT_FOUND)
+        return 200, filter_collection.get_filter_json()
 
 
 class CreateFilterRestServlet(RestServlet):
diff --git a/synapse/rest/client/v2_alpha/room_keys.py b/synapse/rest/client/v2_alpha/room_keys.py
index df4f44cd36..d596786430 100644
--- a/synapse/rest/client/v2_alpha/room_keys.py
+++ b/synapse/rest/client/v2_alpha/room_keys.py
@@ -375,7 +375,7 @@ class RoomKeysVersionServlet(RestServlet):
                     "ed25519:something": "hijklmnop"
                 }
             },
-            "version": "42"
+            "version": "12345"
         }
 
         HTTP/1.1 200 OK
diff --git a/synapse/rest/client/v2_alpha/sync.py b/synapse/rest/client/v2_alpha/sync.py
index c98c5a3802..a883c8adda 100644
--- a/synapse/rest/client/v2_alpha/sync.py
+++ b/synapse/rest/client/v2_alpha/sync.py
@@ -21,7 +21,7 @@ from canonicaljson import json
 from twisted.internet import defer
 
 from synapse.api.constants import PresenceState
-from synapse.api.errors import SynapseError
+from synapse.api.errors import Codes, StoreError, SynapseError
 from synapse.api.filtering import DEFAULT_FILTER_COLLECTION, FilterCollection
 from synapse.events.utils import (
     format_event_for_client_v2_without_room_id,
@@ -119,25 +119,32 @@ class SyncRestServlet(RestServlet):
 
         request_key = (user, timeout, since, filter_id, full_state, device_id)
 
-        if filter_id:
-            if filter_id.startswith("{"):
-                try:
-                    filter_object = json.loads(filter_id)
-                    set_timeline_upper_limit(
-                        filter_object, self.hs.config.filter_timeline_limit
-                    )
-                except Exception:
-                    raise SynapseError(400, "Invalid filter JSON")
-                self.filtering.check_valid_filter(filter_object)
-                filter = FilterCollection(filter_object)
-            else:
-                filter = yield self.filtering.get_user_filter(user.localpart, filter_id)
+        if filter_id is None:
+            filter_collection = DEFAULT_FILTER_COLLECTION
+        elif filter_id.startswith("{"):
+            try:
+                filter_object = json.loads(filter_id)
+                set_timeline_upper_limit(
+                    filter_object, self.hs.config.filter_timeline_limit
+                )
+            except Exception:
+                raise SynapseError(400, "Invalid filter JSON")
+            self.filtering.check_valid_filter(filter_object)
+            filter_collection = FilterCollection(filter_object)
         else:
-            filter = DEFAULT_FILTER_COLLECTION
+            try:
+                filter_collection = yield self.filtering.get_user_filter(
+                    user.localpart, filter_id
+                )
+            except StoreError as err:
+                if err.code != 404:
+                    raise
+                # fix up the description and errcode to be more useful
+                raise SynapseError(400, "No such filter", errcode=Codes.INVALID_PARAM)
 
         sync_config = SyncConfig(
             user=user,
-            filter_collection=filter,
+            filter_collection=filter_collection,
             is_guest=requester.is_guest,
             request_key=request_key,
             device_id=device_id,
@@ -171,7 +178,7 @@ class SyncRestServlet(RestServlet):
 
         time_now = self.clock.time_msec()
         response_content = yield self.encode_response(
-            time_now, sync_result, requester.access_token_id, filter
+            time_now, sync_result, requester.access_token_id, filter_collection
         )
 
         return 200, response_content
diff --git a/synapse/rest/media/v1/_base.py b/synapse/rest/media/v1/_base.py
index 5fefee4dde..65bbf00073 100644
--- a/synapse/rest/media/v1/_base.py
+++ b/synapse/rest/media/v1/_base.py
@@ -195,7 +195,7 @@ def respond_with_responder(request, responder, media_type, file_size, upload_nam
         respond_404(request)
         return
 
-    logger.debug("Responding to media request with responder %s")
+    logger.debug("Responding to media request with responder %s", responder)
     add_file_headers(request, media_type, file_size, upload_name)
     try:
         with responder:
diff --git a/synapse/rest/media/v1/preview_url_resource.py b/synapse/rest/media/v1/preview_url_resource.py
index 7a56cd4b6c..0c68c3aad5 100644
--- a/synapse/rest/media/v1/preview_url_resource.py
+++ b/synapse/rest/media/v1/preview_url_resource.py
@@ -270,7 +270,7 @@ class PreviewUrlResource(DirectServeResource):
 
         logger.debug("Calculated OG for %s as %s" % (url, og))
 
-        jsonog = json.dumps(og).encode("utf8")
+        jsonog = json.dumps(og)
 
         # store OG in history-aware DB cache
         yield self.store.store_url_cache(
@@ -283,7 +283,7 @@ class PreviewUrlResource(DirectServeResource):
             media_info["created_ts"],
         )
 
-        return jsonog
+        return jsonog.encode("utf8")
 
     @defer.inlineCallbacks
     def _download_url(self, url, user):
diff --git a/synapse/rest/media/v1/thumbnailer.py b/synapse/rest/media/v1/thumbnailer.py
index c995d7e043..8cf415e29d 100644
--- a/synapse/rest/media/v1/thumbnailer.py
+++ b/synapse/rest/media/v1/thumbnailer.py
@@ -82,13 +82,21 @@ class Thumbnailer(object):
         else:
             return (max_height * self.width) // self.height, max_height
 
+    def _resize(self, width, height):
+        # 1-bit or 8-bit color palette images need converting to RGB
+        # otherwise they will be scaled using nearest neighbour which
+        # looks awful
+        if self.image.mode in ["1", "P"]:
+            self.image = self.image.convert("RGB")
+        return self.image.resize((width, height), Image.ANTIALIAS)
+
     def scale(self, width, height, output_type):
         """Rescales the image to the given dimensions.
 
         Returns:
             BytesIO: the bytes of the encoded image ready to be written to disk
         """
-        scaled = self.image.resize((width, height), Image.ANTIALIAS)
+        scaled = self._resize(width, height)
         return self._encode_image(scaled, output_type)
 
     def crop(self, width, height, output_type):
@@ -107,13 +115,13 @@ class Thumbnailer(object):
         """
         if width * self.height > height * self.width:
             scaled_height = (width * self.height) // self.width
-            scaled_image = self.image.resize((width, scaled_height), Image.ANTIALIAS)
+            scaled_image = self._resize(width, scaled_height)
             crop_top = (scaled_height - height) // 2
             crop_bottom = height + crop_top
             cropped = scaled_image.crop((0, crop_top, width, crop_bottom))
         else:
             scaled_width = (height * self.width) // self.height
-            scaled_image = self.image.resize((scaled_width, height), Image.ANTIALIAS)
+            scaled_image = self._resize(scaled_width, height)
             crop_left = (scaled_width - width) // 2
             crop_right = width + crop_left
             cropped = scaled_image.crop((crop_left, 0, crop_right, height))
diff --git a/synapse/rest/media/v1/upload_resource.py b/synapse/rest/media/v1/upload_resource.py
index 5d76bbdf68..83d005812d 100644
--- a/synapse/rest/media/v1/upload_resource.py
+++ b/synapse/rest/media/v1/upload_resource.py
@@ -17,7 +17,7 @@ import logging
 
 from twisted.web.server import NOT_DONE_YET
 
-from synapse.api.errors import SynapseError
+from synapse.api.errors import Codes, SynapseError
 from synapse.http.server import (
     DirectServeResource,
     respond_with_json,
@@ -56,7 +56,11 @@ class UploadResource(DirectServeResource):
         if content_length is None:
             raise SynapseError(msg="Request must specify a Content-Length", code=400)
         if int(content_length) > self.max_upload_size:
-            raise SynapseError(msg="Upload request body is too large", code=413)
+            raise SynapseError(
+                msg="Upload request body is too large",
+                code=413,
+                errcode=Codes.TOO_LARGE,
+            )
 
         upload_name = parse_string(request, b"filename", encoding=None)
         if upload_name:
diff --git a/synapse/state/__init__.py b/synapse/state/__init__.py
index 2b0f4c79ee..dc9f5a9008 100644
--- a/synapse/state/__init__.py
+++ b/synapse/state/__init__.py
@@ -33,7 +33,7 @@ from synapse.state import v1, v2
 from synapse.util.async_helpers import Linearizer
 from synapse.util.caches import get_cache_factor_for
 from synapse.util.caches.expiringcache import ExpiringCache
-from synapse.util.metrics import Measure
+from synapse.util.metrics import Measure, measure_func
 
 logger = logging.getLogger(__name__)
 
@@ -191,11 +191,22 @@ class StateHandler(object):
         return joined_users
 
     @defer.inlineCallbacks
-    def get_current_hosts_in_room(self, room_id, latest_event_ids=None):
-        if not latest_event_ids:
-            latest_event_ids = yield self.store.get_latest_event_ids_in_room(room_id)
-        logger.debug("calling resolve_state_groups from get_current_hosts_in_room")
-        entry = yield self.resolve_state_groups_for_events(room_id, latest_event_ids)
+    def get_current_hosts_in_room(self, room_id):
+        event_ids = yield self.store.get_latest_event_ids_in_room(room_id)
+        return (yield self.get_hosts_in_room_at_events(room_id, event_ids))
+
+    @defer.inlineCallbacks
+    def get_hosts_in_room_at_events(self, room_id, event_ids):
+        """Get the hosts that were in a room at the given event ids
+
+        Args:
+            room_id (str):
+            event_ids (list[str]):
+
+        Returns:
+            Deferred[list[str]]: the hosts in the room at the given events
+        """
+        entry = yield self.resolve_state_groups_for_events(room_id, event_ids)
         joined_hosts = yield self.store.get_joined_hosts(room_id, entry)
         return joined_hosts
 
@@ -344,6 +355,7 @@ class StateHandler(object):
 
         return context
 
+    @measure_func()
     @defer.inlineCallbacks
     def resolve_state_groups_for_events(self, room_id, event_ids):
         """ Given a list of event_ids this method fetches the state at each
diff --git a/synapse/storage/_base.py b/synapse/storage/_base.py
index abe16334ec..f5906fcd54 100644
--- a/synapse/storage/_base.py
+++ b/synapse/storage/_base.py
@@ -20,6 +20,7 @@ import random
 import sys
 import threading
 import time
+from typing import Iterable, Tuple
 
 from six import PY2, iteritems, iterkeys, itervalues
 from six.moves import builtins, intern, range
@@ -30,7 +31,7 @@ from prometheus_client import Histogram
 from twisted.internet import defer
 
 from synapse.api.errors import StoreError
-from synapse.logging.context import LoggingContext, PreserveLoggingContext
+from synapse.logging.context import LoggingContext, make_deferred_yieldable
 from synapse.metrics.background_process_metrics import run_as_background_process
 from synapse.storage.engines import PostgresEngine, Sqlite3Engine
 from synapse.types import get_domain_from_id
@@ -550,8 +551,9 @@ class SQLBaseStore(object):
 
                 return func(conn, *args, **kwargs)
 
-        with PreserveLoggingContext():
-            result = yield self._db_pool.runWithConnection(inner_func, *args, **kwargs)
+        result = yield make_deferred_yieldable(
+            self._db_pool.runWithConnection(inner_func, *args, **kwargs)
+        )
 
         return result
 
@@ -1162,19 +1164,18 @@ class SQLBaseStore(object):
         if not iterable:
             return []
 
-        sql = "SELECT %s FROM %s" % (", ".join(retcols), table)
-
-        clauses = []
-        values = []
-        clauses.append("%s IN (%s)" % (column, ",".join("?" for _ in iterable)))
-        values.extend(iterable)
+        clause, values = make_in_list_sql_clause(txn.database_engine, column, iterable)
+        clauses = [clause]
 
         for key, value in iteritems(keyvalues):
             clauses.append("%s = ?" % (key,))
             values.append(value)
 
-        if clauses:
-            sql = "%s WHERE %s" % (sql, " AND ".join(clauses))
+        sql = "SELECT %s FROM %s WHERE %s" % (
+            ", ".join(retcols),
+            table,
+            " AND ".join(clauses),
+        )
 
         txn.execute(sql, values)
         return cls.cursor_to_dict(txn)
@@ -1323,10 +1324,8 @@ class SQLBaseStore(object):
 
         sql = "DELETE FROM %s" % table
 
-        clauses = []
-        values = []
-        clauses.append("%s IN (%s)" % (column, ",".join("?" for _ in iterable)))
-        values.extend(iterable)
+        clause, values = make_in_list_sql_clause(txn.database_engine, column, iterable)
+        clauses = [clause]
 
         for key, value in iteritems(keyvalues):
             clauses.append("%s = ?" % (key,))
@@ -1693,3 +1692,30 @@ def db_to_json(db_content):
     except Exception:
         logging.warning("Tried to decode '%r' as JSON and failed", db_content)
         raise
+
+
+def make_in_list_sql_clause(
+    database_engine, column: str, iterable: Iterable
+) -> Tuple[str, Iterable]:
+    """Returns an SQL clause that checks the given column is in the iterable.
+
+    On SQLite this expands to `column IN (?, ?, ...)`, whereas on Postgres
+    it expands to `column = ANY(?)`. While both DBs support the `IN` form,
+    using the `ANY` form on postgres means that it views queries with
+    different length iterables as the same, helping the query stats.
+
+    Args:
+        database_engine
+        column: Name of the column
+        iterable: The values to check the column against.
+
+    Returns:
+        A tuple of SQL query and the args
+    """
+
+    if database_engine.supports_using_any_list:
+        # This should hopefully be faster, but also makes postgres query
+        # stats easier to understand.
+        return "%s = ANY(?)" % (column,), [list(iterable)]
+    else:
+        return "%s IN (%s)" % (column, ",".join("?" for _ in iterable)), list(iterable)
diff --git a/synapse/storage/client_ips.py b/synapse/storage/client_ips.py
index bb135166ce..067820a5da 100644
--- a/synapse/storage/client_ips.py
+++ b/synapse/storage/client_ips.py
@@ -33,16 +33,9 @@ logger = logging.getLogger(__name__)
 LAST_SEEN_GRANULARITY = 120 * 1000
 
 
-class ClientIpStore(background_updates.BackgroundUpdateStore):
+class ClientIpBackgroundUpdateStore(background_updates.BackgroundUpdateStore):
     def __init__(self, db_conn, hs):
-
-        self.client_ip_last_seen = Cache(
-            name="client_ip_last_seen", keylen=4, max_entries=50000 * CACHE_SIZE_FACTOR
-        )
-
-        super(ClientIpStore, self).__init__(db_conn, hs)
-
-        self.user_ips_max_age = hs.config.user_ips_max_age
+        super(ClientIpBackgroundUpdateStore, self).__init__(db_conn, hs)
 
         self.register_background_index_update(
             "user_ips_device_index",
@@ -92,19 +85,6 @@ class ClientIpStore(background_updates.BackgroundUpdateStore):
             "devices_last_seen", self._devices_last_seen_update
         )
 
-        # (user_id, access_token, ip,) -> (user_agent, device_id, last_seen)
-        self._batch_row_update = {}
-
-        self._client_ip_looper = self._clock.looping_call(
-            self._update_client_ips_batch, 5 * 1000
-        )
-        self.hs.get_reactor().addSystemEventTrigger(
-            "before", "shutdown", self._update_client_ips_batch
-        )
-
-        if self.user_ips_max_age:
-            self._clock.looping_call(self._prune_old_user_ips, 5 * 1000)
-
     @defer.inlineCallbacks
     def _remove_user_ip_nonunique(self, progress, batch_size):
         def f(conn):
@@ -304,6 +284,110 @@ class ClientIpStore(background_updates.BackgroundUpdateStore):
         return batch_size
 
     @defer.inlineCallbacks
+    def _devices_last_seen_update(self, progress, batch_size):
+        """Background update to insert last seen info into devices table
+        """
+
+        last_user_id = progress.get("last_user_id", "")
+        last_device_id = progress.get("last_device_id", "")
+
+        def _devices_last_seen_update_txn(txn):
+            # This consists of two queries:
+            #
+            #   1. The sub-query searches for the next N devices and joins
+            #      against user_ips to find the max last_seen associated with
+            #      that device.
+            #   2. The outer query then joins again against user_ips on
+            #      user/device/last_seen. This *should* hopefully only
+            #      return one row, but if it does return more than one then
+            #      we'll just end up updating the same device row multiple
+            #      times, which is fine.
+
+            if self.database_engine.supports_tuple_comparison:
+                where_clause = "(user_id, device_id) > (?, ?)"
+                where_args = [last_user_id, last_device_id]
+            else:
+                # We explicitly do a `user_id >= ? AND (...)` here to ensure
+                # that an index is used, as doing `user_id > ? OR (user_id = ? AND ...)`
+                # makes it hard for query optimiser to tell that it can use the
+                # index on user_id
+                where_clause = "user_id >= ? AND (user_id > ? OR device_id > ?)"
+                where_args = [last_user_id, last_user_id, last_device_id]
+
+            sql = """
+                SELECT
+                    last_seen, ip, user_agent, user_id, device_id
+                FROM (
+                    SELECT
+                        user_id, device_id, MAX(u.last_seen) AS last_seen
+                    FROM devices
+                    INNER JOIN user_ips AS u USING (user_id, device_id)
+                    WHERE %(where_clause)s
+                    GROUP BY user_id, device_id
+                    ORDER BY user_id ASC, device_id ASC
+                    LIMIT ?
+                ) c
+                INNER JOIN user_ips AS u USING (user_id, device_id, last_seen)
+            """ % {
+                "where_clause": where_clause
+            }
+            txn.execute(sql, where_args + [batch_size])
+
+            rows = txn.fetchall()
+            if not rows:
+                return 0
+
+            sql = """
+                UPDATE devices
+                SET last_seen = ?, ip = ?, user_agent = ?
+                WHERE user_id = ? AND device_id = ?
+            """
+            txn.execute_batch(sql, rows)
+
+            _, _, _, user_id, device_id = rows[-1]
+            self._background_update_progress_txn(
+                txn,
+                "devices_last_seen",
+                {"last_user_id": user_id, "last_device_id": device_id},
+            )
+
+            return len(rows)
+
+        updated = yield self.runInteraction(
+            "_devices_last_seen_update", _devices_last_seen_update_txn
+        )
+
+        if not updated:
+            yield self._end_background_update("devices_last_seen")
+
+        return updated
+
+
+class ClientIpStore(ClientIpBackgroundUpdateStore):
+    def __init__(self, db_conn, hs):
+
+        self.client_ip_last_seen = Cache(
+            name="client_ip_last_seen", keylen=4, max_entries=50000 * CACHE_SIZE_FACTOR
+        )
+
+        super(ClientIpStore, self).__init__(db_conn, hs)
+
+        self.user_ips_max_age = hs.config.user_ips_max_age
+
+        # (user_id, access_token, ip,) -> (user_agent, device_id, last_seen)
+        self._batch_row_update = {}
+
+        self._client_ip_looper = self._clock.looping_call(
+            self._update_client_ips_batch, 5 * 1000
+        )
+        self.hs.get_reactor().addSystemEventTrigger(
+            "before", "shutdown", self._update_client_ips_batch
+        )
+
+        if self.user_ips_max_age:
+            self._clock.looping_call(self._prune_old_user_ips, 5 * 1000)
+
+    @defer.inlineCallbacks
     def insert_client_ip(
         self, user_id, access_token, ip, user_agent, device_id, now=None
     ):
@@ -454,85 +538,6 @@ class ClientIpStore(background_updates.BackgroundUpdateStore):
             for (access_token, ip), (user_agent, last_seen) in iteritems(results)
         )
 
-    @defer.inlineCallbacks
-    def _devices_last_seen_update(self, progress, batch_size):
-        """Background update to insert last seen info into devices table
-        """
-
-        last_user_id = progress.get("last_user_id", "")
-        last_device_id = progress.get("last_device_id", "")
-
-        def _devices_last_seen_update_txn(txn):
-            # This consists of two queries:
-            #
-            #   1. The sub-query searches for the next N devices and joins
-            #      against user_ips to find the max last_seen associated with
-            #      that device.
-            #   2. The outer query then joins again against user_ips on
-            #      user/device/last_seen. This *should* hopefully only
-            #      return one row, but if it does return more than one then
-            #      we'll just end up updating the same device row multiple
-            #      times, which is fine.
-
-            if self.database_engine.supports_tuple_comparison:
-                where_clause = "(user_id, device_id) > (?, ?)"
-                where_args = [last_user_id, last_device_id]
-            else:
-                # We explicitly do a `user_id >= ? AND (...)` here to ensure
-                # that an index is used, as doing `user_id > ? OR (user_id = ? AND ...)`
-                # makes it hard for query optimiser to tell that it can use the
-                # index on user_id
-                where_clause = "user_id >= ? AND (user_id > ? OR device_id > ?)"
-                where_args = [last_user_id, last_user_id, last_device_id]
-
-            sql = """
-                SELECT
-                    last_seen, ip, user_agent, user_id, device_id
-                FROM (
-                    SELECT
-                        user_id, device_id, MAX(u.last_seen) AS last_seen
-                    FROM devices
-                    INNER JOIN user_ips AS u USING (user_id, device_id)
-                    WHERE %(where_clause)s
-                    GROUP BY user_id, device_id
-                    ORDER BY user_id ASC, device_id ASC
-                    LIMIT ?
-                ) c
-                INNER JOIN user_ips AS u USING (user_id, device_id, last_seen)
-            """ % {
-                "where_clause": where_clause
-            }
-            txn.execute(sql, where_args + [batch_size])
-
-            rows = txn.fetchall()
-            if not rows:
-                return 0
-
-            sql = """
-                UPDATE devices
-                SET last_seen = ?, ip = ?, user_agent = ?
-                WHERE user_id = ? AND device_id = ?
-            """
-            txn.execute_batch(sql, rows)
-
-            _, _, _, user_id, device_id = rows[-1]
-            self._background_update_progress_txn(
-                txn,
-                "devices_last_seen",
-                {"last_user_id": user_id, "last_device_id": device_id},
-            )
-
-            return len(rows)
-
-        updated = yield self.runInteraction(
-            "_devices_last_seen_update", _devices_last_seen_update_txn
-        )
-
-        if not updated:
-            yield self._end_background_update("devices_last_seen")
-
-        return updated
-
     @wrap_as_background_process("prune_old_user_ips")
     async def _prune_old_user_ips(self):
         """Removes entries in user IPs older than the configured period.
diff --git a/synapse/storage/deviceinbox.py b/synapse/storage/deviceinbox.py
index 6b7458304e..f04aad0743 100644
--- a/synapse/storage/deviceinbox.py
+++ b/synapse/storage/deviceinbox.py
@@ -20,7 +20,7 @@ from canonicaljson import json
 from twisted.internet import defer
 
 from synapse.logging.opentracing import log_kv, set_tag, trace
-from synapse.storage._base import SQLBaseStore
+from synapse.storage._base import SQLBaseStore, make_in_list_sql_clause
 from synapse.storage.background_updates import BackgroundUpdateStore
 from synapse.util.caches.expiringcache import ExpiringCache
 
@@ -208,11 +208,11 @@ class DeviceInboxWorkerStore(SQLBaseStore):
         )
 
 
-class DeviceInboxStore(DeviceInboxWorkerStore, BackgroundUpdateStore):
+class DeviceInboxBackgroundUpdateStore(BackgroundUpdateStore):
     DEVICE_INBOX_STREAM_ID = "device_inbox_stream_drop"
 
     def __init__(self, db_conn, hs):
-        super(DeviceInboxStore, self).__init__(db_conn, hs)
+        super(DeviceInboxBackgroundUpdateStore, self).__init__(db_conn, hs)
 
         self.register_background_index_update(
             "device_inbox_stream_index",
@@ -225,6 +225,26 @@ class DeviceInboxStore(DeviceInboxWorkerStore, BackgroundUpdateStore):
             self.DEVICE_INBOX_STREAM_ID, self._background_drop_index_device_inbox
         )
 
+    @defer.inlineCallbacks
+    def _background_drop_index_device_inbox(self, progress, batch_size):
+        def reindex_txn(conn):
+            txn = conn.cursor()
+            txn.execute("DROP INDEX IF EXISTS device_inbox_stream_id")
+            txn.close()
+
+        yield self.runWithConnection(reindex_txn)
+
+        yield self._end_background_update(self.DEVICE_INBOX_STREAM_ID)
+
+        return 1
+
+
+class DeviceInboxStore(DeviceInboxWorkerStore, DeviceInboxBackgroundUpdateStore):
+    DEVICE_INBOX_STREAM_ID = "device_inbox_stream_drop"
+
+    def __init__(self, db_conn, hs):
+        super(DeviceInboxStore, self).__init__(db_conn, hs)
+
         # Map of (user_id, device_id) to the last stream_id that has been
         # deleted up to. This is so that we can no op deletions.
         self._last_device_delete_cache = ExpiringCache(
@@ -358,15 +378,15 @@ class DeviceInboxStore(DeviceInboxWorkerStore, BackgroundUpdateStore):
             else:
                 if not devices:
                     continue
-                sql = (
-                    "SELECT device_id FROM devices"
-                    " WHERE user_id = ? AND device_id IN ("
-                    + ",".join("?" * len(devices))
-                    + ")"
+
+                clause, args = make_in_list_sql_clause(
+                    txn.database_engine, "device_id", devices
                 )
+                sql = "SELECT device_id FROM devices WHERE user_id = ? AND " + clause
+
                 # TODO: Maybe this needs to be done in batches if there are
                 # too many local devices for a given user.
-                txn.execute(sql, [user_id] + devices)
+                txn.execute(sql, [user_id] + list(args))
                 for row in txn:
                     # Only insert into the local inbox if the device exists on
                     # this server
@@ -435,16 +455,3 @@ class DeviceInboxStore(DeviceInboxWorkerStore, BackgroundUpdateStore):
         return self.runInteraction(
             "get_all_new_device_messages", get_all_new_device_messages_txn
         )
-
-    @defer.inlineCallbacks
-    def _background_drop_index_device_inbox(self, progress, batch_size):
-        def reindex_txn(conn):
-            txn = conn.cursor()
-            txn.execute("DROP INDEX IF EXISTS device_inbox_stream_id")
-            txn.close()
-
-        yield self.runWithConnection(reindex_txn)
-
-        yield self._end_background_update(self.DEVICE_INBOX_STREAM_ID)
-
-        return 1
diff --git a/synapse/storage/devices.py b/synapse/storage/devices.py
index 79a58df591..ac5239e50a 100644
--- a/synapse/storage/devices.py
+++ b/synapse/storage/devices.py
@@ -28,7 +28,12 @@ from synapse.logging.opentracing import (
     whitelisted_homeserver,
 )
 from synapse.metrics.background_process_metrics import run_as_background_process
-from synapse.storage._base import Cache, SQLBaseStore, db_to_json
+from synapse.storage._base import (
+    Cache,
+    SQLBaseStore,
+    db_to_json,
+    make_in_list_sql_clause,
+)
 from synapse.storage.background_updates import BackgroundUpdateStore
 from synapse.util import batch_iter
 from synapse.util.caches.descriptors import cached, cachedInlineCallbacks, cachedList
@@ -448,11 +453,14 @@ class DeviceWorkerStore(SQLBaseStore):
             sql = """
                 SELECT DISTINCT user_id FROM device_lists_stream
                 WHERE stream_id > ?
-                AND user_id IN (%s)
+                AND
             """
 
             for chunk in batch_iter(to_check, 100):
-                txn.execute(sql % (",".join("?" for _ in chunk),), (from_key,) + chunk)
+                clause, args = make_in_list_sql_clause(
+                    txn.database_engine, "user_id", chunk
+                )
+                txn.execute(sql + clause, (from_key,) + tuple(args))
                 changes.update(user_id for user_id, in txn)
 
             return changes
@@ -512,17 +520,9 @@ class DeviceWorkerStore(SQLBaseStore):
         return results
 
 
-class DeviceStore(DeviceWorkerStore, BackgroundUpdateStore):
+class DeviceBackgroundUpdateStore(BackgroundUpdateStore):
     def __init__(self, db_conn, hs):
-        super(DeviceStore, self).__init__(db_conn, hs)
-
-        # Map of (user_id, device_id) -> bool. If there is an entry that implies
-        # the device exists.
-        self.device_id_exists_cache = Cache(
-            name="device_id_exists", keylen=2, max_entries=10000
-        )
-
-        self._clock.looping_call(self._prune_old_outbound_device_pokes, 60 * 60 * 1000)
+        super(DeviceBackgroundUpdateStore, self).__init__(db_conn, hs)
 
         self.register_background_index_update(
             "device_lists_stream_idx",
@@ -556,6 +556,31 @@ class DeviceStore(DeviceWorkerStore, BackgroundUpdateStore):
         )
 
     @defer.inlineCallbacks
+    def _drop_device_list_streams_non_unique_indexes(self, progress, batch_size):
+        def f(conn):
+            txn = conn.cursor()
+            txn.execute("DROP INDEX IF EXISTS device_lists_remote_cache_id")
+            txn.execute("DROP INDEX IF EXISTS device_lists_remote_extremeties_id")
+            txn.close()
+
+        yield self.runWithConnection(f)
+        yield self._end_background_update(DROP_DEVICE_LIST_STREAMS_NON_UNIQUE_INDEXES)
+        return 1
+
+
+class DeviceStore(DeviceWorkerStore, DeviceBackgroundUpdateStore):
+    def __init__(self, db_conn, hs):
+        super(DeviceStore, self).__init__(db_conn, hs)
+
+        # Map of (user_id, device_id) -> bool. If there is an entry that implies
+        # the device exists.
+        self.device_id_exists_cache = Cache(
+            name="device_id_exists", keylen=2, max_entries=10000
+        )
+
+        self._clock.looping_call(self._prune_old_outbound_device_pokes, 60 * 60 * 1000)
+
+    @defer.inlineCallbacks
     def store_device(self, user_id, device_id, initial_device_display_name):
         """Ensure the given device is known; add it to the store if not
 
@@ -910,15 +935,3 @@ class DeviceStore(DeviceWorkerStore, BackgroundUpdateStore):
             "_prune_old_outbound_device_pokes",
             _prune_txn,
         )
-
-    @defer.inlineCallbacks
-    def _drop_device_list_streams_non_unique_indexes(self, progress, batch_size):
-        def f(conn):
-            txn = conn.cursor()
-            txn.execute("DROP INDEX IF EXISTS device_lists_remote_cache_id")
-            txn.execute("DROP INDEX IF EXISTS device_lists_remote_extremeties_id")
-            txn.close()
-
-        yield self.runWithConnection(f)
-        yield self._end_background_update(DROP_DEVICE_LIST_STREAMS_NON_UNIQUE_INDEXES)
-        return 1
diff --git a/synapse/storage/end_to_end_keys.py b/synapse/storage/end_to_end_keys.py
index 33e3a84933..872bc75490 100644
--- a/synapse/storage/end_to_end_keys.py
+++ b/synapse/storage/end_to_end_keys.py
@@ -40,7 +40,8 @@ class EndToEndKeyWorkerStore(SQLBaseStore):
                 This option only takes effect if include_all_devices is true.
         Returns:
             Dict mapping from user-id to dict mapping from device_id to
-            dict containing "key_json", "device_display_name".
+            key data.  The key data will be a dict in the same format as the
+            DeviceKeys type returned by POST /_matrix/client/r0/keys/query.
         """
         set_tag("query_list", query_list)
         if not query_list:
@@ -54,11 +55,20 @@ class EndToEndKeyWorkerStore(SQLBaseStore):
             include_deleted_devices,
         )
 
+        # Build the result structure, un-jsonify the results, and add the
+        # "unsigned" section
+        rv = {}
         for user_id, device_keys in iteritems(results):
+            rv[user_id] = {}
             for device_id, device_info in iteritems(device_keys):
-                device_info["keys"] = db_to_json(device_info.pop("key_json"))
-
-        return results
+                r = db_to_json(device_info.pop("key_json"))
+                r["unsigned"] = {}
+                display_name = device_info["device_display_name"]
+                if display_name is not None:
+                    r["unsigned"]["device_display_name"] = display_name
+                rv[user_id][device_id] = r
+
+        return rv
 
     @trace
     def _get_e2e_device_keys_txn(
diff --git a/synapse/storage/engines/postgres.py b/synapse/storage/engines/postgres.py
index 601617b21e..b7c4eda338 100644
--- a/synapse/storage/engines/postgres.py
+++ b/synapse/storage/engines/postgres.py
@@ -22,6 +22,13 @@ class PostgresEngine(object):
     def __init__(self, database_module, database_config):
         self.module = database_module
         self.module.extensions.register_type(self.module.extensions.UNICODE)
+
+        # Disables passing `bytes` to txn.execute, c.f. #6186. If you do
+        # actually want to use bytes than wrap it in `bytearray`.
+        def _disable_bytes_adapter(_):
+            raise Exception("Passing bytes to DB is disabled.")
+
+        self.module.extensions.register_adapter(bytes, _disable_bytes_adapter)
         self.synchronous_commit = database_config.get("synchronous_commit", True)
         self._version = None  # unknown as yet
 
@@ -79,6 +86,12 @@ class PostgresEngine(object):
         """
         return True
 
+    @property
+    def supports_using_any_list(self):
+        """Do we support using `a = ANY(?)` and passing a list
+        """
+        return True
+
     def is_deadlock(self, error):
         if isinstance(error, self.module.DatabaseError):
             # https://www.postgresql.org/docs/current/static/errcodes-appendix.html
diff --git a/synapse/storage/engines/sqlite.py b/synapse/storage/engines/sqlite.py
index ac92109366..ddad17dc5a 100644
--- a/synapse/storage/engines/sqlite.py
+++ b/synapse/storage/engines/sqlite.py
@@ -46,6 +46,12 @@ class Sqlite3Engine(object):
         """
         return self.module.sqlite_version_info >= (3, 15, 0)
 
+    @property
+    def supports_using_any_list(self):
+        """Do we support using `a = ANY(?)` and passing a list
+        """
+        return False
+
     def check_database(self, txn):
         pass
 
diff --git a/synapse/storage/event_federation.py b/synapse/storage/event_federation.py
index f5e8c39262..47cc10d32a 100644
--- a/synapse/storage/event_federation.py
+++ b/synapse/storage/event_federation.py
@@ -25,7 +25,7 @@ from twisted.internet import defer
 
 from synapse.api.errors import StoreError
 from synapse.metrics.background_process_metrics import run_as_background_process
-from synapse.storage._base import SQLBaseStore
+from synapse.storage._base import SQLBaseStore, make_in_list_sql_clause
 from synapse.storage.events_worker import EventsWorkerStore
 from synapse.storage.signatures import SignatureWorkerStore
 from synapse.util.caches.descriptors import cached
@@ -68,7 +68,7 @@ class EventFederationWorkerStore(EventsWorkerStore, SignatureWorkerStore, SQLBas
         else:
             results = set()
 
-        base_sql = "SELECT auth_id FROM event_auth WHERE event_id IN (%s)"
+        base_sql = "SELECT auth_id FROM event_auth WHERE "
 
         front = set(event_ids)
         while front:
@@ -76,7 +76,10 @@ class EventFederationWorkerStore(EventsWorkerStore, SignatureWorkerStore, SQLBas
             front_list = list(front)
             chunks = [front_list[x : x + 100] for x in range(0, len(front), 100)]
             for chunk in chunks:
-                txn.execute(base_sql % (",".join(["?"] * len(chunk)),), chunk)
+                clause, args = make_in_list_sql_clause(
+                    txn.database_engine, "event_id", chunk
+                )
+                txn.execute(base_sql + clause, list(args))
                 new_front.update([r[0] for r in txn])
 
             new_front -= results
diff --git a/synapse/storage/events.py b/synapse/storage/events.py
index bb6ff0595a..ee49ef235d 100644
--- a/synapse/storage/events.py
+++ b/synapse/storage/events.py
@@ -39,6 +39,7 @@ from synapse.logging.utils import log_function
 from synapse.metrics import BucketCollector
 from synapse.metrics.background_process_metrics import run_as_background_process
 from synapse.state import StateResolutionStore
+from synapse.storage._base import make_in_list_sql_clause
 from synapse.storage.background_updates import BackgroundUpdateStore
 from synapse.storage.event_federation import EventFederationStore
 from synapse.storage.events_worker import EventsWorkerStore
@@ -641,14 +642,16 @@ class EventsStore(
                 LEFT JOIN rejections USING (event_id)
                 LEFT JOIN event_json USING (event_id)
             WHERE
-                prev_event_id IN (%s)
-                AND NOT events.outlier
+                NOT events.outlier
                 AND rejections.event_id IS NULL
-            """ % (
-                ",".join("?" for _ in batch),
+                AND
+            """
+
+            clause, args = make_in_list_sql_clause(
+                self.database_engine, "prev_event_id", batch
             )
 
-            txn.execute(sql, batch)
+            txn.execute(sql + clause, args)
             results.extend(r[0] for r in txn if not json.loads(r[1]).get("soft_failed"))
 
         for chunk in batch_iter(event_ids, 100):
@@ -695,13 +698,15 @@ class EventsStore(
                     LEFT JOIN rejections USING (event_id)
                     LEFT JOIN event_json USING (event_id)
                 WHERE
-                    event_id IN (%s)
-                    AND NOT events.outlier
-                """ % (
-                    ",".join("?" for _ in to_recursively_check),
+                    NOT events.outlier
+                    AND
+                """
+
+                clause, args = make_in_list_sql_clause(
+                    self.database_engine, "event_id", to_recursively_check
                 )
 
-                txn.execute(sql, to_recursively_check)
+                txn.execute(sql + clause, args)
                 to_recursively_check = []
 
                 for event_id, prev_event_id, metadata, rejected in txn:
@@ -1543,10 +1548,14 @@ class EventsStore(
                 " FROM events as e"
                 " LEFT JOIN rejections as rej USING (event_id)"
                 " LEFT JOIN redactions as r ON e.event_id = r.redacts"
-                " WHERE e.event_id IN (%s)"
-            ) % (",".join(["?"] * len(ev_map)),)
+                " WHERE "
+            )
+
+            clause, args = make_in_list_sql_clause(
+                self.database_engine, "e.event_id", list(ev_map)
+            )
 
-            txn.execute(sql, list(ev_map))
+            txn.execute(sql + clause, args)
             rows = self.cursor_to_dict(txn)
             for row in rows:
                 event = ev_map[row["event_id"]]
@@ -2249,11 +2258,12 @@ class EventsStore(
             sql = """
                 SELECT DISTINCT state_group FROM event_to_state_groups
                 LEFT JOIN events_to_purge AS ep USING (event_id)
-                WHERE state_group IN (%s) AND ep.event_id IS NULL
-            """ % (
-                ",".join("?" for _ in current_search),
+                WHERE ep.event_id IS NULL AND
+            """
+            clause, args = make_in_list_sql_clause(
+                txn.database_engine, "state_group", current_search
             )
-            txn.execute(sql, list(current_search))
+            txn.execute(sql + clause, list(args))
 
             referenced = set(sg for sg, in txn)
             referenced_groups |= referenced
diff --git a/synapse/storage/events_bg_updates.py b/synapse/storage/events_bg_updates.py
index e77a7e28af..31ea6f917f 100644
--- a/synapse/storage/events_bg_updates.py
+++ b/synapse/storage/events_bg_updates.py
@@ -21,6 +21,7 @@ from canonicaljson import json
 
 from twisted.internet import defer
 
+from synapse.storage._base import make_in_list_sql_clause
 from synapse.storage.background_updates import BackgroundUpdateStore
 
 logger = logging.getLogger(__name__)
@@ -325,12 +326,13 @@ class EventsBackgroundUpdatesStore(BackgroundUpdateStore):
                     INNER JOIN event_json USING (event_id)
                     LEFT JOIN rejections USING (event_id)
                     WHERE
-                        prev_event_id IN (%s)
-                        AND NOT events.outlier
-                """ % (
-                    ",".join("?" for _ in to_check),
+                        NOT events.outlier
+                        AND
+                """
+                clause, args = make_in_list_sql_clause(
+                    self.database_engine, "prev_event_id", to_check
                 )
-                txn.execute(sql, to_check)
+                txn.execute(sql + clause, list(args))
 
                 for prev_event_id, event_id, metadata, rejected in txn:
                     if event_id in graph:
diff --git a/synapse/storage/events_worker.py b/synapse/storage/events_worker.py
index 57ce0304e9..4c4b76bd93 100644
--- a/synapse/storage/events_worker.py
+++ b/synapse/storage/events_worker.py
@@ -31,12 +31,11 @@ from synapse.events.snapshot import EventContext  # noqa: F401
 from synapse.events.utils import prune_event
 from synapse.logging.context import LoggingContext, PreserveLoggingContext
 from synapse.metrics.background_process_metrics import run_as_background_process
+from synapse.storage._base import SQLBaseStore, make_in_list_sql_clause
 from synapse.types import get_domain_from_id
 from synapse.util import batch_iter
 from synapse.util.metrics import Measure
 
-from ._base import SQLBaseStore
-
 logger = logging.getLogger(__name__)
 
 
@@ -623,10 +622,14 @@ class EventsWorkerStore(SQLBaseStore):
                 " rej.reason "
                 " FROM event_json as e"
                 " LEFT JOIN rejections as rej USING (event_id)"
-                " WHERE e.event_id IN (%s)"
-            ) % (",".join(["?"] * len(evs)),)
+                " WHERE "
+            )
 
-            txn.execute(sql, evs)
+            clause, args = make_in_list_sql_clause(
+                txn.database_engine, "e.event_id", evs
+            )
+
+            txn.execute(sql + clause, args)
 
             for row in txn:
                 event_id = row[0]
@@ -640,11 +643,11 @@ class EventsWorkerStore(SQLBaseStore):
                 }
 
             # check for redactions
-            redactions_sql = (
-                "SELECT event_id, redacts FROM redactions WHERE redacts IN (%s)"
-            ) % (",".join(["?"] * len(evs)),)
+            redactions_sql = "SELECT event_id, redacts FROM redactions WHERE "
+
+            clause, args = make_in_list_sql_clause(txn.database_engine, "redacts", evs)
 
-            txn.execute(redactions_sql, evs)
+            txn.execute(redactions_sql + clause, args)
 
             for (redacter, redacted) in txn:
                 d = event_dict.get(redacted)
@@ -753,10 +756,11 @@ class EventsWorkerStore(SQLBaseStore):
         results = set()
 
         def have_seen_events_txn(txn, chunk):
-            sql = "SELECT event_id FROM events as e WHERE e.event_id IN (%s)" % (
-                ",".join("?" * len(chunk)),
+            sql = "SELECT event_id FROM events as e WHERE "
+            clause, args = make_in_list_sql_clause(
+                txn.database_engine, "e.event_id", chunk
             )
-            txn.execute(sql, chunk)
+            txn.execute(sql + clause, args)
             for (event_id,) in txn:
                 results.add(event_id)
 
diff --git a/synapse/storage/filtering.py b/synapse/storage/filtering.py
index 23b48f6cea..7c2a7da836 100644
--- a/synapse/storage/filtering.py
+++ b/synapse/storage/filtering.py
@@ -51,7 +51,7 @@ class FilteringStore(SQLBaseStore):
                 "SELECT filter_id FROM user_filters "
                 "WHERE user_id = ? AND filter_json = ?"
             )
-            txn.execute(sql, (user_localpart, def_json))
+            txn.execute(sql, (user_localpart, bytearray(def_json)))
             filter_id_response = txn.fetchone()
             if filter_id_response is not None:
                 return filter_id_response[0]
@@ -68,7 +68,7 @@ class FilteringStore(SQLBaseStore):
                 "INSERT INTO user_filters (user_id, filter_id, filter_json)"
                 "VALUES(?, ?, ?)"
             )
-            txn.execute(sql, (user_localpart, filter_id, def_json))
+            txn.execute(sql, (user_localpart, filter_id, bytearray(def_json)))
 
             return filter_id
 
diff --git a/synapse/storage/media_repository.py b/synapse/storage/media_repository.py
index 6b1238ce4a..84b5f3ad5e 100644
--- a/synapse/storage/media_repository.py
+++ b/synapse/storage/media_repository.py
@@ -15,11 +15,9 @@
 from synapse.storage.background_updates import BackgroundUpdateStore
 
 
-class MediaRepositoryStore(BackgroundUpdateStore):
-    """Persistence for attachments and avatars"""
-
+class MediaRepositoryBackgroundUpdateStore(BackgroundUpdateStore):
     def __init__(self, db_conn, hs):
-        super(MediaRepositoryStore, self).__init__(db_conn, hs)
+        super(MediaRepositoryBackgroundUpdateStore, self).__init__(db_conn, hs)
 
         self.register_background_index_update(
             update_name="local_media_repository_url_idx",
@@ -29,6 +27,13 @@ class MediaRepositoryStore(BackgroundUpdateStore):
             where_clause="url_cache IS NOT NULL",
         )
 
+
+class MediaRepositoryStore(MediaRepositoryBackgroundUpdateStore):
+    """Persistence for attachments and avatars"""
+
+    def __init__(self, db_conn, hs):
+        super(MediaRepositoryStore, self).__init__(db_conn, hs)
+
     def get_local_media(self, media_id):
         """Get the metadata for a local piece of media
         Returns:
diff --git a/synapse/storage/monthly_active_users.py b/synapse/storage/monthly_active_users.py
index 752e9788a2..3803604be7 100644
--- a/synapse/storage/monthly_active_users.py
+++ b/synapse/storage/monthly_active_users.py
@@ -32,7 +32,6 @@ class MonthlyActiveUsersStore(SQLBaseStore):
         super(MonthlyActiveUsersStore, self).__init__(None, hs)
         self._clock = hs.get_clock()
         self.hs = hs
-        self.reserved_users = ()
         # Do not add more reserved users than the total allowable number
         self._new_transaction(
             dbconn,
@@ -51,7 +50,6 @@ class MonthlyActiveUsersStore(SQLBaseStore):
             txn (cursor):
             threepids (list[dict]): List of threepid dicts to reserve
         """
-        reserved_user_list = []
 
         for tp in threepids:
             user_id = self.get_user_id_by_threepid_txn(txn, tp["medium"], tp["address"])
@@ -60,10 +58,8 @@ class MonthlyActiveUsersStore(SQLBaseStore):
                 is_support = self.is_support_user_txn(txn, user_id)
                 if not is_support:
                     self.upsert_monthly_active_user_txn(txn, user_id)
-                    reserved_user_list.append(user_id)
             else:
                 logger.warning("mau limit reserved threepid %s not found in db" % tp)
-        self.reserved_users = tuple(reserved_user_list)
 
     @defer.inlineCallbacks
     def reap_monthly_active_users(self):
@@ -74,8 +70,11 @@ class MonthlyActiveUsersStore(SQLBaseStore):
             Deferred[]
         """
 
-        def _reap_users(txn):
-            # Purge stale users
+        def _reap_users(txn, reserved_users):
+            """
+            Args:
+                reserved_users (tuple): reserved users to preserve
+            """
 
             thirty_days_ago = int(self._clock.time_msec()) - (1000 * 60 * 60 * 24 * 30)
             query_args = [thirty_days_ago]
@@ -83,20 +82,19 @@ class MonthlyActiveUsersStore(SQLBaseStore):
 
             # Need if/else since 'AND user_id NOT IN ({})' fails on Postgres
             # when len(reserved_users) == 0. Works fine on sqlite.
-            if len(self.reserved_users) > 0:
+            if len(reserved_users) > 0:
                 # questionmarks is a hack to overcome sqlite not supporting
                 # tuples in 'WHERE IN %s'
-                questionmarks = "?" * len(self.reserved_users)
+                question_marks = ",".join("?" * len(reserved_users))
 
-                query_args.extend(self.reserved_users)
-                sql = base_sql + """ AND user_id NOT IN ({})""".format(
-                    ",".join(questionmarks)
-                )
+                query_args.extend(reserved_users)
+                sql = base_sql + " AND user_id NOT IN ({})".format(question_marks)
             else:
                 sql = base_sql
 
             txn.execute(sql, query_args)
 
+            max_mau_value = self.hs.config.max_mau_value
             if self.hs.config.limit_usage_by_mau:
                 # If MAU user count still exceeds the MAU threshold, then delete on
                 # a least recently active basis.
@@ -106,31 +104,52 @@ class MonthlyActiveUsersStore(SQLBaseStore):
                 # While Postgres does not require 'LIMIT', but also does not support
                 # negative LIMIT values. So there is no way to write it that both can
                 # support
-                safe_guard = self.hs.config.max_mau_value - len(self.reserved_users)
-                # Must be greater than zero for postgres
-                safe_guard = safe_guard if safe_guard > 0 else 0
-                query_args = [safe_guard]
-
-                base_sql = """
-                    DELETE FROM monthly_active_users
-                    WHERE user_id NOT IN (
-                        SELECT user_id FROM monthly_active_users
-                        ORDER BY timestamp DESC
-                        LIMIT ?
+                if len(reserved_users) == 0:
+                    sql = """
+                        DELETE FROM monthly_active_users
+                        WHERE user_id NOT IN (
+                            SELECT user_id FROM monthly_active_users
+                            ORDER BY timestamp DESC
+                            LIMIT ?
                         )
-                    """
+                        """
+                    txn.execute(sql, (max_mau_value,))
                 # Need if/else since 'AND user_id NOT IN ({})' fails on Postgres
                 # when len(reserved_users) == 0. Works fine on sqlite.
-                if len(self.reserved_users) > 0:
-                    query_args.extend(self.reserved_users)
-                    sql = base_sql + """ AND user_id NOT IN ({})""".format(
-                        ",".join(questionmarks)
-                    )
                 else:
-                    sql = base_sql
-                txn.execute(sql, query_args)
+                    # Must be >= 0 for postgres
+                    num_of_non_reserved_users_to_remove = max(
+                        max_mau_value - len(reserved_users), 0
+                    )
+
+                    # It is important to filter reserved users twice to guard
+                    # against the case where the reserved user is present in the
+                    # SELECT, meaning that a legitmate mau is deleted.
+                    sql = """
+                        DELETE FROM monthly_active_users
+                        WHERE user_id NOT IN (
+                            SELECT user_id FROM monthly_active_users
+                            WHERE user_id NOT IN ({})
+                            ORDER BY timestamp DESC
+                            LIMIT ?
+                        )
+                        AND user_id NOT IN ({})
+                    """.format(
+                        question_marks, question_marks
+                    )
+
+                    query_args = [
+                        *reserved_users,
+                        num_of_non_reserved_users_to_remove,
+                        *reserved_users,
+                    ]
 
-        yield self.runInteraction("reap_monthly_active_users", _reap_users)
+                    txn.execute(sql, query_args)
+
+        reserved_users = yield self.get_registered_reserved_users()
+        yield self.runInteraction(
+            "reap_monthly_active_users", _reap_users, reserved_users
+        )
         # It seems poor to invalidate the whole cache, Postgres supports
         # 'Returning' which would allow me to invalidate only the
         # specific users, but sqlite has no way to do this and instead
@@ -159,21 +178,25 @@ class MonthlyActiveUsersStore(SQLBaseStore):
         return self.runInteraction("count_users", _count_users)
 
     @defer.inlineCallbacks
-    def get_registered_reserved_users_count(self):
-        """Of the reserved threepids defined in config, how many are associated
+    def get_registered_reserved_users(self):
+        """Of the reserved threepids defined in config, which are associated
         with registered users?
 
         Returns:
-            Defered[int]: Number of real reserved users
+            Defered[list]: Real reserved users
         """
-        count = 0
-        for tp in self.hs.config.mau_limits_reserved_threepids:
+        users = []
+
+        for tp in self.hs.config.mau_limits_reserved_threepids[
+            : self.hs.config.max_mau_value
+        ]:
             user_id = yield self.hs.get_datastore().get_user_id_by_threepid(
                 tp["medium"], tp["address"]
             )
             if user_id:
-                count = count + 1
-        return count
+                users.append(user_id)
+
+        return users
 
     @defer.inlineCallbacks
     def upsert_monthly_active_user(self, user_id):
diff --git a/synapse/storage/presence.py b/synapse/storage/presence.py
index 5db6f2d84a..3a641f538b 100644
--- a/synapse/storage/presence.py
+++ b/synapse/storage/presence.py
@@ -18,11 +18,10 @@ from collections import namedtuple
 from twisted.internet import defer
 
 from synapse.api.constants import PresenceState
+from synapse.storage._base import SQLBaseStore, make_in_list_sql_clause
 from synapse.util import batch_iter
 from synapse.util.caches.descriptors import cached, cachedList
 
-from ._base import SQLBaseStore
-
 
 class UserPresenceState(
     namedtuple(
@@ -119,14 +118,13 @@ class PresenceStore(SQLBaseStore):
         )
 
         # Delete old rows to stop database from getting really big
-        sql = (
-            "DELETE FROM presence_stream WHERE" " stream_id < ?" " AND user_id IN (%s)"
-        )
+        sql = "DELETE FROM presence_stream WHERE stream_id < ? AND "
 
         for states in batch_iter(presence_states, 50):
-            args = [stream_id]
-            args.extend(s.user_id for s in states)
-            txn.execute(sql % (",".join("?" for _ in states),), args)
+            clause, args = make_in_list_sql_clause(
+                self.database_engine, "user_id", [s.user_id for s in states]
+            )
+            txn.execute(sql + clause, [stream_id] + list(args))
 
     def get_all_presence_updates(self, last_id, current_id):
         if last_id == current_id:
diff --git a/synapse/storage/push_rule.py b/synapse/storage/push_rule.py
index a6517c4cf3..c4e24edff2 100644
--- a/synapse/storage/push_rule.py
+++ b/synapse/storage/push_rule.py
@@ -183,8 +183,8 @@ class PushRulesWorkerStore(
         return results
 
     @defer.inlineCallbacks
-    def move_push_rule_from_room_to_room(self, new_room_id, user_id, rule):
-        """Move a single push rule from one room to another for a specific user.
+    def copy_push_rule_from_room_to_room(self, new_room_id, user_id, rule):
+        """Copy a single push rule from one room to another for a specific user.
 
         Args:
             new_room_id (str): ID of the new room.
@@ -209,14 +209,11 @@ class PushRulesWorkerStore(
             actions=rule["actions"],
         )
 
-        # Delete push rule for the old room
-        yield self.delete_push_rule(user_id, rule["rule_id"])
-
     @defer.inlineCallbacks
-    def move_push_rules_from_room_to_room_for_user(
+    def copy_push_rules_from_room_to_room_for_user(
         self, old_room_id, new_room_id, user_id
     ):
-        """Move all of the push rules from one room to another for a specific
+        """Copy all of the push rules from one room to another for a specific
         user.
 
         Args:
@@ -227,15 +224,14 @@ class PushRulesWorkerStore(
         # Retrieve push rules for this user
         user_push_rules = yield self.get_push_rules_for_user(user_id)
 
-        # Get rules relating to the old room, move them to the new room, then
-        # delete them from the old room
+        # Get rules relating to the old room and copy them to the new room
         for rule in user_push_rules:
             conditions = rule.get("conditions", [])
             if any(
                 (c.get("key") == "room_id" and c.get("pattern") == old_room_id)
                 for c in conditions
             ):
-                self.move_push_rule_from_room_to_room(new_room_id, user_id, rule)
+                yield self.copy_push_rule_from_room_to_room(new_room_id, user_id, rule)
 
     @defer.inlineCallbacks
     def bulk_get_push_rules_for_room(self, event, context):
diff --git a/synapse/storage/pusher.py b/synapse/storage/pusher.py
index 3e0e834a62..b12e80440a 100644
--- a/synapse/storage/pusher.py
+++ b/synapse/storage/pusher.py
@@ -241,7 +241,7 @@ class PusherStore(PusherWorkerStore):
                     "device_display_name": device_display_name,
                     "ts": pushkey_ts,
                     "lang": lang,
-                    "data": encode_canonical_json(data),
+                    "data": bytearray(encode_canonical_json(data)),
                     "last_stream_ordering": last_stream_ordering,
                     "profile_tag": profile_tag,
                     "id": stream_id,
diff --git a/synapse/storage/receipts.py b/synapse/storage/receipts.py
index 290ddb30e8..0c24430f28 100644
--- a/synapse/storage/receipts.py
+++ b/synapse/storage/receipts.py
@@ -21,12 +21,11 @@ from canonicaljson import json
 
 from twisted.internet import defer
 
+from synapse.storage._base import SQLBaseStore, make_in_list_sql_clause
+from synapse.storage.util.id_generators import StreamIdGenerator
 from synapse.util.caches.descriptors import cached, cachedInlineCallbacks, cachedList
 from synapse.util.caches.stream_change_cache import StreamChangeCache
 
-from ._base import SQLBaseStore
-from .util.id_generators import StreamIdGenerator
-
 logger = logging.getLogger(__name__)
 
 
@@ -217,24 +216,26 @@ class ReceiptsWorkerStore(SQLBaseStore):
 
         def f(txn):
             if from_key:
-                sql = (
-                    "SELECT * FROM receipts_linearized WHERE"
-                    " room_id IN (%s) AND stream_id > ? AND stream_id <= ?"
-                ) % (",".join(["?"] * len(room_ids)))
-                args = list(room_ids)
-                args.extend([from_key, to_key])
+                sql = """
+                    SELECT * FROM receipts_linearized WHERE
+                    stream_id > ? AND stream_id <= ? AND
+                """
+                clause, args = make_in_list_sql_clause(
+                    self.database_engine, "room_id", room_ids
+                )
 
-                txn.execute(sql, args)
+                txn.execute(sql + clause, [from_key, to_key] + list(args))
             else:
-                sql = (
-                    "SELECT * FROM receipts_linearized WHERE"
-                    " room_id IN (%s) AND stream_id <= ?"
-                ) % (",".join(["?"] * len(room_ids)))
+                sql = """
+                    SELECT * FROM receipts_linearized WHERE
+                    stream_id <= ? AND
+                """
 
-                args = list(room_ids)
-                args.append(to_key)
+                clause, args = make_in_list_sql_clause(
+                    self.database_engine, "room_id", room_ids
+                )
 
-                txn.execute(sql, args)
+                txn.execute(sql + clause, [to_key] + list(args))
 
             return self.cursor_to_dict(txn)
 
@@ -433,13 +434,19 @@ class ReceiptsStore(ReceiptsWorkerStore):
             # we need to points in graph -> linearized form.
             # TODO: Make this better.
             def graph_to_linear(txn):
-                query = (
-                    "SELECT event_id WHERE room_id = ? AND stream_ordering IN ("
-                    " SELECT max(stream_ordering) WHERE event_id IN (%s)"
-                    ")"
-                ) % (",".join(["?"] * len(event_ids)))
+                clause, args = make_in_list_sql_clause(
+                    self.database_engine, "event_id", event_ids
+                )
+
+                sql = """
+                    SELECT event_id WHERE room_id = ? AND stream_ordering IN (
+                        SELECT max(stream_ordering) WHERE %s
+                    )
+                """ % (
+                    clause,
+                )
 
-                txn.execute(query, [room_id] + event_ids)
+                txn.execute(sql, [room_id] + list(args))
                 rows = txn.fetchall()
                 if rows:
                     return rows[0][0]
diff --git a/synapse/storage/registration.py b/synapse/storage/registration.py
index 241a7be51e..6c5b29288a 100644
--- a/synapse/storage/registration.py
+++ b/synapse/storage/registration.py
@@ -493,7 +493,9 @@ class RegistrationWorkerStore(SQLBaseStore):
         """
 
         def _find_next_generated_user_id(txn):
-            txn.execute("SELECT name FROM users")
+            # We bound between '@1' and '@a' to avoid pulling the entire table
+            # out.
+            txn.execute("SELECT name FROM users WHERE '@1' <= name AND name < '@a'")
 
             regex = re.compile(r"^@(\d+):")
 
@@ -785,13 +787,14 @@ class RegistrationWorkerStore(SQLBaseStore):
         )
 
 
-class RegistrationStore(
+class RegistrationBackgroundUpdateStore(
     RegistrationWorkerStore, background_updates.BackgroundUpdateStore
 ):
     def __init__(self, db_conn, hs):
-        super(RegistrationStore, self).__init__(db_conn, hs)
+        super(RegistrationBackgroundUpdateStore, self).__init__(db_conn, hs)
 
         self.clock = hs.get_clock()
+        self.config = hs.config
 
         self.register_background_index_update(
             "access_tokens_device_index",
@@ -807,8 +810,6 @@ class RegistrationStore(
             columns=["creation_ts"],
         )
 
-        self._account_validity = hs.config.account_validity
-
         # we no longer use refresh tokens, but it's possible that some people
         # might have a background update queued to build this index. Just
         # clear the background update.
@@ -822,17 +823,6 @@ class RegistrationStore(
             "users_set_deactivated_flag", self._background_update_set_deactivated_flag
         )
 
-        # Create a background job for culling expired 3PID validity tokens
-        def start_cull():
-            # run as a background process to make sure that the database transactions
-            # have a logcontext to report to
-            return run_as_background_process(
-                "cull_expired_threepid_validation_tokens",
-                self.cull_expired_threepid_validation_tokens,
-            )
-
-        hs.get_clock().looping_call(start_cull, THIRTY_MINUTES_IN_MS)
-
     @defer.inlineCallbacks
     def _background_update_set_deactivated_flag(self, progress, batch_size):
         """Retrieves a list of all deactivated users and sets the 'deactivated' flag to 1
@@ -895,6 +885,54 @@ class RegistrationStore(
         return nb_processed
 
     @defer.inlineCallbacks
+    def _bg_user_threepids_grandfather(self, progress, batch_size):
+        """We now track which identity servers a user binds their 3PID to, so
+        we need to handle the case of existing bindings where we didn't track
+        this.
+
+        We do this by grandfathering in existing user threepids assuming that
+        they used one of the server configured trusted identity servers.
+        """
+        id_servers = set(self.config.trusted_third_party_id_servers)
+
+        def _bg_user_threepids_grandfather_txn(txn):
+            sql = """
+                INSERT INTO user_threepid_id_server
+                    (user_id, medium, address, id_server)
+                SELECT user_id, medium, address, ?
+                FROM user_threepids
+            """
+
+            txn.executemany(sql, [(id_server,) for id_server in id_servers])
+
+        if id_servers:
+            yield self.runInteraction(
+                "_bg_user_threepids_grandfather", _bg_user_threepids_grandfather_txn
+            )
+
+        yield self._end_background_update("user_threepids_grandfather")
+
+        return 1
+
+
+class RegistrationStore(RegistrationBackgroundUpdateStore):
+    def __init__(self, db_conn, hs):
+        super(RegistrationStore, self).__init__(db_conn, hs)
+
+        self._account_validity = hs.config.account_validity
+
+        # Create a background job for culling expired 3PID validity tokens
+        def start_cull():
+            # run as a background process to make sure that the database transactions
+            # have a logcontext to report to
+            return run_as_background_process(
+                "cull_expired_threepid_validation_tokens",
+                self.cull_expired_threepid_validation_tokens,
+            )
+
+        hs.get_clock().looping_call(start_cull, THIRTY_MINUTES_IN_MS)
+
+    @defer.inlineCallbacks
     def add_access_token_to_user(self, user_id, token, device_id, valid_until_ms):
         """Adds an access token for the given user.
 
@@ -1242,36 +1280,6 @@ class RegistrationStore(
             desc="get_users_pending_deactivation",
         )
 
-    @defer.inlineCallbacks
-    def _bg_user_threepids_grandfather(self, progress, batch_size):
-        """We now track which identity servers a user binds their 3PID to, so
-        we need to handle the case of existing bindings where we didn't track
-        this.
-
-        We do this by grandfathering in existing user threepids assuming that
-        they used one of the server configured trusted identity servers.
-        """
-        id_servers = set(self.config.trusted_third_party_id_servers)
-
-        def _bg_user_threepids_grandfather_txn(txn):
-            sql = """
-                INSERT INTO user_threepid_id_server
-                    (user_id, medium, address, id_server)
-                SELECT user_id, medium, address, ?
-                FROM user_threepids
-            """
-
-            txn.executemany(sql, [(id_server,) for id_server in id_servers])
-
-        if id_servers:
-            yield self.runInteraction(
-                "_bg_user_threepids_grandfather", _bg_user_threepids_grandfather_txn
-            )
-
-        yield self._end_background_update("user_threepids_grandfather")
-
-        return 1
-
     def validate_threepid_session(self, session_id, client_secret, token, current_ts):
         """Attempt to validate a threepid session using a token
 
@@ -1463,17 +1471,6 @@ class RegistrationStore(
             self.clock.time_msec(),
         )
 
-    def set_user_deactivated_status_txn(self, txn, user_id, deactivated):
-        self._simple_update_one_txn(
-            txn=txn,
-            table="users",
-            keyvalues={"name": user_id},
-            updatevalues={"deactivated": 1 if deactivated else 0},
-        )
-        self._invalidate_cache_and_stream(
-            txn, self.get_user_deactivated_status, (user_id,)
-        )
-
     @defer.inlineCallbacks
     def set_user_deactivated_status(self, user_id, deactivated):
         """Set the `deactivated` property for the provided user to the provided value.
@@ -1489,3 +1486,14 @@ class RegistrationStore(
             user_id,
             deactivated,
         )
+
+    def set_user_deactivated_status_txn(self, txn, user_id, deactivated):
+        self._simple_update_one_txn(
+            txn=txn,
+            table="users",
+            keyvalues={"name": user_id},
+            updatevalues={"deactivated": 1 if deactivated else 0},
+        )
+        self._invalidate_cache_and_stream(
+            txn, self.get_user_deactivated_status, (user_id,)
+        )
diff --git a/synapse/storage/room.py b/synapse/storage/room.py
index 08e13f3a3b..43cc56fa6f 100644
--- a/synapse/storage/room.py
+++ b/synapse/storage/room.py
@@ -1,5 +1,6 @@
 # -*- coding: utf-8 -*-
 # Copyright 2014-2016 OpenMarket Ltd
+# Copyright 2019 The Matrix.org Foundation C.I.C.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -16,6 +17,7 @@
 import collections
 import logging
 import re
+from typing import Optional, Tuple
 
 from canonicaljson import json
 
@@ -24,6 +26,7 @@ from twisted.internet import defer
 from synapse.api.errors import StoreError
 from synapse.storage._base import SQLBaseStore
 from synapse.storage.search import SearchStore
+from synapse.types import ThirdPartyInstanceID
 from synapse.util.caches.descriptors import cached, cachedInlineCallbacks
 
 logger = logging.getLogger(__name__)
@@ -63,103 +66,196 @@ class RoomWorkerStore(SQLBaseStore):
             desc="get_public_room_ids",
         )
 
-    @cached(num_args=2, max_entries=100)
-    def get_public_room_ids_at_stream_id(self, stream_id, network_tuple):
-        """Get pulbic rooms for a particular list, or across all lists.
+    def count_public_rooms(self, network_tuple, ignore_non_federatable):
+        """Counts the number of public rooms as tracked in the room_stats_current
+        and room_stats_state table.
 
         Args:
-            stream_id (int)
-            network_tuple (ThirdPartyInstanceID): The list to use (None, None)
-                means the main list, None means all lsits.
+            network_tuple (ThirdPartyInstanceID|None)
+            ignore_non_federatable (bool): If true filters out non-federatable rooms
         """
-        return self.runInteraction(
-            "get_public_room_ids_at_stream_id",
-            self.get_public_room_ids_at_stream_id_txn,
-            stream_id,
-            network_tuple=network_tuple,
-        )
-
-    def get_public_room_ids_at_stream_id_txn(self, txn, stream_id, network_tuple):
-        return {
-            rm
-            for rm, vis in self.get_published_at_stream_id_txn(
-                txn, stream_id, network_tuple=network_tuple
-            ).items()
-            if vis
-        }
 
-    def get_published_at_stream_id_txn(self, txn, stream_id, network_tuple):
-        if network_tuple:
-            # We want to get from a particular list. No aggregation required.
+        def _count_public_rooms_txn(txn):
+            query_args = []
+
+            if network_tuple:
+                if network_tuple.appservice_id:
+                    published_sql = """
+                        SELECT room_id from appservice_room_list
+                        WHERE appservice_id = ? AND network_id = ?
+                    """
+                    query_args.append(network_tuple.appservice_id)
+                    query_args.append(network_tuple.network_id)
+                else:
+                    published_sql = """
+                        SELECT room_id FROM rooms WHERE is_public
+                    """
+            else:
+                published_sql = """
+                    SELECT room_id FROM rooms WHERE is_public
+                    UNION SELECT room_id from appservice_room_list
+            """
 
             sql = """
-                SELECT room_id, visibility FROM public_room_list_stream
-                INNER JOIN (
-                    SELECT room_id, max(stream_id) AS stream_id
-                    FROM public_room_list_stream
-                    WHERE stream_id <= ? %s
-                    GROUP BY room_id
-                ) grouped USING (room_id, stream_id)
+                SELECT
+                    COALESCE(COUNT(*), 0)
+                FROM (
+                    %(published_sql)s
+                ) published
+                INNER JOIN room_stats_state USING (room_id)
+                INNER JOIN room_stats_current USING (room_id)
+                WHERE
+                    (
+                        join_rules = 'public' OR history_visibility = 'world_readable'
+                    )
+                    AND joined_members > 0
+            """ % {
+                "published_sql": published_sql
+            }
+
+            txn.execute(sql, query_args)
+            return txn.fetchone()[0]
+
+        return self.runInteraction("count_public_rooms", _count_public_rooms_txn)
+
+    @defer.inlineCallbacks
+    def get_largest_public_rooms(
+        self,
+        network_tuple: Optional[ThirdPartyInstanceID],
+        search_filter: Optional[dict],
+        limit: Optional[int],
+        bounds: Optional[Tuple[int, str]],
+        forwards: bool,
+        ignore_non_federatable: bool = False,
+    ):
+        """Gets the largest public rooms (where largest is in terms of joined
+        members, as tracked in the statistics table).
+
+        Args:
+            network_tuple
+            search_filter
+            limit: Maxmimum number of rows to return, unlimited otherwise.
+            bounds: An uppoer or lower bound to apply to result set if given,
+                consists of a joined member count and room_id (these are
+                excluded from result set).
+            forwards: true iff going forwards, going backwards otherwise
+            ignore_non_federatable: If true filters out non-federatable rooms.
+
+        Returns:
+            Rooms in order: biggest number of joined users first.
+            We then arbitrarily use the room_id as a tie breaker.
+
+        """
+
+        where_clauses = []
+        query_args = []
+
+        if network_tuple:
+            if network_tuple.appservice_id:
+                published_sql = """
+                    SELECT room_id from appservice_room_list
+                    WHERE appservice_id = ? AND network_id = ?
+                """
+                query_args.append(network_tuple.appservice_id)
+                query_args.append(network_tuple.network_id)
+            else:
+                published_sql = """
+                    SELECT room_id FROM rooms WHERE is_public
+                """
+        else:
+            published_sql = """
+                SELECT room_id FROM rooms WHERE is_public
+                UNION SELECT room_id from appservice_room_list
             """
 
-            if network_tuple.appservice_id is not None:
-                txn.execute(
-                    sql % ("AND appservice_id = ? AND network_id = ?",),
-                    (stream_id, network_tuple.appservice_id, network_tuple.network_id),
+        # Work out the bounds if we're given them, these bounds look slightly
+        # odd, but are designed to help query planner use indices by pulling
+        # out a common bound.
+        if bounds:
+            last_joined_members, last_room_id = bounds
+            if forwards:
+                where_clauses.append(
+                    """
+                        joined_members <= ? AND (
+                            joined_members < ? OR room_id < ?
+                        )
+                    """
                 )
             else:
-                txn.execute(sql % ("AND appservice_id IS NULL",), (stream_id,))
-            return dict(txn)
-        else:
-            # We want to get from all lists, so we need to aggregate the results
+                where_clauses.append(
+                    """
+                        joined_members >= ? AND (
+                            joined_members > ? OR room_id > ?
+                        )
+                    """
+                )
 
-            logger.info("Executing full list")
+            query_args += [last_joined_members, last_joined_members, last_room_id]
 
-            sql = """
-                SELECT room_id, visibility
-                FROM public_room_list_stream
-                INNER JOIN (
-                    SELECT
-                        room_id, max(stream_id) AS stream_id, appservice_id,
-                        network_id
-                    FROM public_room_list_stream
-                    WHERE stream_id <= ?
-                    GROUP BY room_id, appservice_id, network_id
-                ) grouped USING (room_id, stream_id)
-            """
+        if ignore_non_federatable:
+            where_clauses.append("is_federatable")
 
-            txn.execute(sql, (stream_id,))
+        if search_filter and search_filter.get("generic_search_term", None):
+            search_term = "%" + search_filter["generic_search_term"] + "%"
 
-            results = {}
-            # A room is visible if its visible on any list.
-            for room_id, visibility in txn:
-                results[room_id] = bool(visibility) or results.get(room_id, False)
+            where_clauses.append(
+                """
+                    (
+                        name LIKE ?
+                        OR topic LIKE ?
+                        OR canonical_alias LIKE ?
+                    )
+                """
+            )
+            query_args += [search_term, search_term, search_term]
+
+        where_clause = ""
+        if where_clauses:
+            where_clause = " AND " + " AND ".join(where_clauses)
+
+        sql = """
+            SELECT
+                room_id, name, topic, canonical_alias, joined_members,
+                avatar, history_visibility, joined_members, guest_access
+            FROM (
+                %(published_sql)s
+            ) published
+            INNER JOIN room_stats_state USING (room_id)
+            INNER JOIN room_stats_current USING (room_id)
+            WHERE
+                (
+                    join_rules = 'public' OR history_visibility = 'world_readable'
+                )
+                AND joined_members > 0
+                %(where_clause)s
+            ORDER BY joined_members %(dir)s, room_id %(dir)s
+        """ % {
+            "published_sql": published_sql,
+            "where_clause": where_clause,
+            "dir": "DESC" if forwards else "ASC",
+        }
 
-            return results
+        if limit is not None:
+            query_args.append(limit)
 
-    def get_public_room_changes(self, prev_stream_id, new_stream_id, network_tuple):
-        def get_public_room_changes_txn(txn):
-            then_rooms = self.get_public_room_ids_at_stream_id_txn(
-                txn, prev_stream_id, network_tuple
-            )
+            sql += """
+                LIMIT ?
+            """
 
-            now_rooms_dict = self.get_published_at_stream_id_txn(
-                txn, new_stream_id, network_tuple
-            )
+        def _get_largest_public_rooms_txn(txn):
+            txn.execute(sql, query_args)
 
-            now_rooms_visible = set(rm for rm, vis in now_rooms_dict.items() if vis)
-            now_rooms_not_visible = set(
-                rm for rm, vis in now_rooms_dict.items() if not vis
-            )
+            results = self.cursor_to_dict(txn)
 
-            newly_visible = now_rooms_visible - then_rooms
-            newly_unpublished = now_rooms_not_visible & then_rooms
+            if not forwards:
+                results.reverse()
 
-            return newly_visible, newly_unpublished
+            return results
 
-        return self.runInteraction(
-            "get_public_room_changes", get_public_room_changes_txn
+        ret_val = yield self.runInteraction(
+            "get_largest_public_rooms", _get_largest_public_rooms_txn
         )
+        defer.returnValue(ret_val)
 
     @cached(max_entries=10000)
     def is_room_blocked(self, room_id):
diff --git a/synapse/storage/roommember.py b/synapse/storage/roommember.py
index 4df8ebdacd..ff63487823 100644
--- a/synapse/storage/roommember.py
+++ b/synapse/storage/roommember.py
@@ -26,13 +26,15 @@ from twisted.internet import defer
 from synapse.api.constants import EventTypes, Membership
 from synapse.metrics import LaterGauge
 from synapse.metrics.background_process_metrics import run_as_background_process
-from synapse.storage._base import LoggingTransaction
+from synapse.storage._base import LoggingTransaction, make_in_list_sql_clause
+from synapse.storage.background_updates import BackgroundUpdateStore
 from synapse.storage.engines import Sqlite3Engine
 from synapse.storage.events_worker import EventsWorkerStore
 from synapse.types import get_domain_from_id
 from synapse.util.async_helpers import Linearizer
 from synapse.util.caches import intern_string
-from synapse.util.caches.descriptors import cached, cachedInlineCallbacks
+from synapse.util.caches.descriptors import cached, cachedInlineCallbacks, cachedList
+from synapse.util.metrics import Measure
 from synapse.util.stringutils import to_ascii
 
 logger = logging.getLogger(__name__)
@@ -370,6 +372,9 @@ class RoomMemberWorkerStore(EventsWorkerStore):
         results = []
         if membership_list:
             if self._current_state_events_membership_up_to_date:
+                clause, args = make_in_list_sql_clause(
+                    self.database_engine, "c.membership", membership_list
+                )
                 sql = """
                     SELECT room_id, e.sender, c.membership, event_id, e.stream_ordering
                     FROM current_state_events AS c
@@ -377,11 +382,14 @@ class RoomMemberWorkerStore(EventsWorkerStore):
                     WHERE
                         c.type = 'm.room.member'
                         AND state_key = ?
-                        AND c.membership IN (%s)
+                        AND %s
                 """ % (
-                    ",".join("?" * len(membership_list))
+                    clause,
                 )
             else:
+                clause, args = make_in_list_sql_clause(
+                    self.database_engine, "m.membership", membership_list
+                )
                 sql = """
                     SELECT room_id, e.sender, m.membership, event_id, e.stream_ordering
                     FROM current_state_events AS c
@@ -390,12 +398,12 @@ class RoomMemberWorkerStore(EventsWorkerStore):
                     WHERE
                         c.type = 'm.room.member'
                         AND state_key = ?
-                        AND m.membership IN (%s)
+                        AND %s
                 """ % (
-                    ",".join("?" * len(membership_list))
+                    clause,
                 )
 
-            txn.execute(sql, (user_id, *membership_list))
+            txn.execute(sql, (user_id, *args))
             results = [RoomsForUser(**r) for r in self.cursor_to_dict(txn)]
 
         if do_invite:
@@ -483,6 +491,7 @@ class RoomMemberWorkerStore(EventsWorkerStore):
         )
         return result
 
+    @defer.inlineCallbacks
     def get_joined_users_from_state(self, room_id, state_entry):
         state_group = state_entry.state_group
         if not state_group:
@@ -492,9 +501,12 @@ class RoomMemberWorkerStore(EventsWorkerStore):
             # To do this we set the state_group to a new object as object() != object()
             state_group = object()
 
-        return self._get_joined_users_from_context(
-            room_id, state_group, state_entry.state, context=state_entry
-        )
+        with Measure(self._clock, "get_joined_users_from_state"):
+            return (
+                yield self._get_joined_users_from_context(
+                    room_id, state_group, state_entry.state, context=state_entry
+                )
+            )
 
     @cachedInlineCallbacks(
         num_args=2, cache_context=True, iterable=True, max_entries=100000
@@ -567,25 +579,10 @@ class RoomMemberWorkerStore(EventsWorkerStore):
                 missing_member_event_ids.append(event_id)
 
         if missing_member_event_ids:
-            rows = yield self._simple_select_many_batch(
-                table="room_memberships",
-                column="event_id",
-                iterable=missing_member_event_ids,
-                retcols=("user_id", "display_name", "avatar_url"),
-                keyvalues={"membership": Membership.JOIN},
-                batch_size=500,
-                desc="_get_joined_users_from_context",
-            )
-
-            users_in_room.update(
-                {
-                    to_ascii(row["user_id"]): ProfileInfo(
-                        avatar_url=to_ascii(row["avatar_url"]),
-                        display_name=to_ascii(row["display_name"]),
-                    )
-                    for row in rows
-                }
+            event_to_memberships = yield self._get_joined_profiles_from_event_ids(
+                missing_member_event_ids
             )
+            users_in_room.update((row for row in event_to_memberships.values() if row))
 
         if event is not None and event.type == EventTypes.Member:
             if event.membership == Membership.JOIN:
@@ -597,6 +594,47 @@ class RoomMemberWorkerStore(EventsWorkerStore):
 
         return users_in_room
 
+    @cached(max_entries=10000)
+    def _get_joined_profile_from_event_id(self, event_id):
+        raise NotImplementedError()
+
+    @cachedList(
+        cached_method_name="_get_joined_profile_from_event_id",
+        list_name="event_ids",
+        inlineCallbacks=True,
+    )
+    def _get_joined_profiles_from_event_ids(self, event_ids):
+        """For given set of member event_ids check if they point to a join
+        event and if so return the associated user and profile info.
+
+        Args:
+            event_ids (Iterable[str]): The member event IDs to lookup
+
+        Returns:
+            Deferred[dict[str, Tuple[str, ProfileInfo]|None]]: Map from event ID
+            to `user_id` and ProfileInfo (or None if not join event).
+        """
+
+        rows = yield self._simple_select_many_batch(
+            table="room_memberships",
+            column="event_id",
+            iterable=event_ids,
+            retcols=("user_id", "display_name", "avatar_url", "event_id"),
+            keyvalues={"membership": Membership.JOIN},
+            batch_size=500,
+            desc="_get_membership_from_event_ids",
+        )
+
+        return {
+            row["event_id"]: (
+                row["user_id"],
+                ProfileInfo(
+                    avatar_url=row["avatar_url"], display_name=row["display_name"]
+                ),
+            )
+            for row in rows
+        }
+
     @cachedInlineCallbacks(max_entries=10000)
     def is_host_joined(self, room_id, host):
         if "%" in host or "_" in host:
@@ -669,6 +707,7 @@ class RoomMemberWorkerStore(EventsWorkerStore):
 
         return True
 
+    @defer.inlineCallbacks
     def get_joined_hosts(self, room_id, state_entry):
         state_group = state_entry.state_group
         if not state_group:
@@ -678,9 +717,12 @@ class RoomMemberWorkerStore(EventsWorkerStore):
             # To do this we set the state_group to a new object as object() != object()
             state_group = object()
 
-        return self._get_joined_hosts(
-            room_id, state_group, state_entry.state, state_entry=state_entry
-        )
+        with Measure(self._clock, "get_joined_hosts"):
+            return (
+                yield self._get_joined_hosts(
+                    room_id, state_group, state_entry.state, state_entry=state_entry
+                )
+            )
 
     @cachedInlineCallbacks(num_args=2, max_entries=10000, iterable=True)
     # @defer.inlineCallbacks
@@ -785,9 +827,9 @@ class RoomMemberWorkerStore(EventsWorkerStore):
         return set(room_ids)
 
 
-class RoomMemberStore(RoomMemberWorkerStore):
+class RoomMemberBackgroundUpdateStore(BackgroundUpdateStore):
     def __init__(self, db_conn, hs):
-        super(RoomMemberStore, self).__init__(db_conn, hs)
+        super(RoomMemberBackgroundUpdateStore, self).__init__(db_conn, hs)
         self.register_background_update_handler(
             _MEMBERSHIP_PROFILE_UPDATE_NAME, self._background_add_membership_profile
         )
@@ -803,112 +845,6 @@ class RoomMemberStore(RoomMemberWorkerStore):
             where_clause="forgotten = 1",
         )
 
-    def _store_room_members_txn(self, txn, events, backfilled):
-        """Store a room member in the database.
-        """
-        self._simple_insert_many_txn(
-            txn,
-            table="room_memberships",
-            values=[
-                {
-                    "event_id": event.event_id,
-                    "user_id": event.state_key,
-                    "sender": event.user_id,
-                    "room_id": event.room_id,
-                    "membership": event.membership,
-                    "display_name": event.content.get("displayname", None),
-                    "avatar_url": event.content.get("avatar_url", None),
-                }
-                for event in events
-            ],
-        )
-
-        for event in events:
-            txn.call_after(
-                self._membership_stream_cache.entity_has_changed,
-                event.state_key,
-                event.internal_metadata.stream_ordering,
-            )
-            txn.call_after(
-                self.get_invited_rooms_for_user.invalidate, (event.state_key,)
-            )
-
-            # We update the local_invites table only if the event is "current",
-            # i.e., its something that has just happened. If the event is an
-            # outlier it is only current if its an "out of band membership",
-            # like a remote invite or a rejection of a remote invite.
-            is_new_state = not backfilled and (
-                not event.internal_metadata.is_outlier()
-                or event.internal_metadata.is_out_of_band_membership()
-            )
-            is_mine = self.hs.is_mine_id(event.state_key)
-            if is_new_state and is_mine:
-                if event.membership == Membership.INVITE:
-                    self._simple_insert_txn(
-                        txn,
-                        table="local_invites",
-                        values={
-                            "event_id": event.event_id,
-                            "invitee": event.state_key,
-                            "inviter": event.sender,
-                            "room_id": event.room_id,
-                            "stream_id": event.internal_metadata.stream_ordering,
-                        },
-                    )
-                else:
-                    sql = (
-                        "UPDATE local_invites SET stream_id = ?, replaced_by = ? WHERE"
-                        " room_id = ? AND invitee = ? AND locally_rejected is NULL"
-                        " AND replaced_by is NULL"
-                    )
-
-                    txn.execute(
-                        sql,
-                        (
-                            event.internal_metadata.stream_ordering,
-                            event.event_id,
-                            event.room_id,
-                            event.state_key,
-                        ),
-                    )
-
-    @defer.inlineCallbacks
-    def locally_reject_invite(self, user_id, room_id):
-        sql = (
-            "UPDATE local_invites SET stream_id = ?, locally_rejected = ? WHERE"
-            " room_id = ? AND invitee = ? AND locally_rejected is NULL"
-            " AND replaced_by is NULL"
-        )
-
-        def f(txn, stream_ordering):
-            txn.execute(sql, (stream_ordering, True, room_id, user_id))
-
-        with self._stream_id_gen.get_next() as stream_ordering:
-            yield self.runInteraction("locally_reject_invite", f, stream_ordering)
-
-    def forget(self, user_id, room_id):
-        """Indicate that user_id wishes to discard history for room_id."""
-
-        def f(txn):
-            sql = (
-                "UPDATE"
-                "  room_memberships"
-                " SET"
-                "  forgotten = 1"
-                " WHERE"
-                "  user_id = ?"
-                " AND"
-                "  room_id = ?"
-            )
-            txn.execute(sql, (user_id, room_id))
-
-            self._invalidate_cache_and_stream(txn, self.did_forget, (user_id, room_id))
-            self._invalidate_cache_and_stream(
-                txn, self.get_forgotten_rooms_for_user, (user_id,)
-            )
-
-        return self.runInteraction("forget_membership", f)
-
     @defer.inlineCallbacks
     def _background_add_membership_profile(self, progress, batch_size):
         target_min_stream_id = progress.get(
@@ -1043,6 +979,117 @@ class RoomMemberStore(RoomMemberWorkerStore):
         return row_count
 
 
+class RoomMemberStore(RoomMemberWorkerStore, RoomMemberBackgroundUpdateStore):
+    def __init__(self, db_conn, hs):
+        super(RoomMemberStore, self).__init__(db_conn, hs)
+
+    def _store_room_members_txn(self, txn, events, backfilled):
+        """Store a room member in the database.
+        """
+        self._simple_insert_many_txn(
+            txn,
+            table="room_memberships",
+            values=[
+                {
+                    "event_id": event.event_id,
+                    "user_id": event.state_key,
+                    "sender": event.user_id,
+                    "room_id": event.room_id,
+                    "membership": event.membership,
+                    "display_name": event.content.get("displayname", None),
+                    "avatar_url": event.content.get("avatar_url", None),
+                }
+                for event in events
+            ],
+        )
+
+        for event in events:
+            txn.call_after(
+                self._membership_stream_cache.entity_has_changed,
+                event.state_key,
+                event.internal_metadata.stream_ordering,
+            )
+            txn.call_after(
+                self.get_invited_rooms_for_user.invalidate, (event.state_key,)
+            )
+
+            # We update the local_invites table only if the event is "current",
+            # i.e., its something that has just happened. If the event is an
+            # outlier it is only current if its an "out of band membership",
+            # like a remote invite or a rejection of a remote invite.
+            is_new_state = not backfilled and (
+                not event.internal_metadata.is_outlier()
+                or event.internal_metadata.is_out_of_band_membership()
+            )
+            is_mine = self.hs.is_mine_id(event.state_key)
+            if is_new_state and is_mine:
+                if event.membership == Membership.INVITE:
+                    self._simple_insert_txn(
+                        txn,
+                        table="local_invites",
+                        values={
+                            "event_id": event.event_id,
+                            "invitee": event.state_key,
+                            "inviter": event.sender,
+                            "room_id": event.room_id,
+                            "stream_id": event.internal_metadata.stream_ordering,
+                        },
+                    )
+                else:
+                    sql = (
+                        "UPDATE local_invites SET stream_id = ?, replaced_by = ? WHERE"
+                        " room_id = ? AND invitee = ? AND locally_rejected is NULL"
+                        " AND replaced_by is NULL"
+                    )
+
+                    txn.execute(
+                        sql,
+                        (
+                            event.internal_metadata.stream_ordering,
+                            event.event_id,
+                            event.room_id,
+                            event.state_key,
+                        ),
+                    )
+
+    @defer.inlineCallbacks
+    def locally_reject_invite(self, user_id, room_id):
+        sql = (
+            "UPDATE local_invites SET stream_id = ?, locally_rejected = ? WHERE"
+            " room_id = ? AND invitee = ? AND locally_rejected is NULL"
+            " AND replaced_by is NULL"
+        )
+
+        def f(txn, stream_ordering):
+            txn.execute(sql, (stream_ordering, True, room_id, user_id))
+
+        with self._stream_id_gen.get_next() as stream_ordering:
+            yield self.runInteraction("locally_reject_invite", f, stream_ordering)
+
+    def forget(self, user_id, room_id):
+        """Indicate that user_id wishes to discard history for room_id."""
+
+        def f(txn):
+            sql = (
+                "UPDATE"
+                "  room_memberships"
+                " SET"
+                "  forgotten = 1"
+                " WHERE"
+                "  user_id = ?"
+                " AND"
+                "  room_id = ?"
+            )
+            txn.execute(sql, (user_id, room_id))
+
+            self._invalidate_cache_and_stream(txn, self.did_forget, (user_id, room_id))
+            self._invalidate_cache_and_stream(
+                txn, self.get_forgotten_rooms_for_user, (user_id,)
+            )
+
+        return self.runInteraction("forget_membership", f)
+
+
 class _JoinedHostsCache(object):
     """Cache for joined hosts in a room that is optimised to handle updates
     via state deltas.
diff --git a/synapse/storage/schema/delta/56/drop_unused_event_tables.sql b/synapse/storage/schema/delta/56/drop_unused_event_tables.sql
new file mode 100644
index 0000000000..9f09922c67
--- /dev/null
+++ b/synapse/storage/schema/delta/56/drop_unused_event_tables.sql
@@ -0,0 +1,20 @@
+/* Copyright 2019 The Matrix.org Foundation C.I.C.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+-- these tables are never used.
+DROP TABLE IF EXISTS room_names;
+DROP TABLE IF EXISTS topics;
+DROP TABLE IF EXISTS history_visibility;
+DROP TABLE IF EXISTS guest_access;
diff --git a/synapse/storage/schema/delta/56/public_room_list_idx.sql b/synapse/storage/schema/delta/56/public_room_list_idx.sql
new file mode 100644
index 0000000000..7be31ffebb
--- /dev/null
+++ b/synapse/storage/schema/delta/56/public_room_list_idx.sql
@@ -0,0 +1,16 @@
+/* Copyright 2019 The Matrix.org Foundation C.I.C.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+CREATE INDEX public_room_list_stream_network ON public_room_list_stream (appservice_id, network_id, room_id);
diff --git a/synapse/storage/schema/delta/56/unique_user_filter_index.py b/synapse/storage/schema/delta/56/unique_user_filter_index.py
new file mode 100644
index 0000000000..1de8b54961
--- /dev/null
+++ b/synapse/storage/schema/delta/56/unique_user_filter_index.py
@@ -0,0 +1,52 @@
+import logging
+
+from synapse.storage.engines import PostgresEngine
+
+logger = logging.getLogger(__name__)
+
+
+"""
+This migration updates the user_filters table as follows:
+
+ - drops any (user_id, filter_id) duplicates
+ - makes the columns NON-NULLable
+ - turns the index into a UNIQUE index
+"""
+
+
+def run_upgrade(cur, database_engine, *args, **kwargs):
+    pass
+
+
+def run_create(cur, database_engine, *args, **kwargs):
+    if isinstance(database_engine, PostgresEngine):
+        select_clause = """
+            SELECT DISTINCT ON (user_id, filter_id) user_id, filter_id, filter_json
+            FROM user_filters
+        """
+    else:
+        select_clause = """
+            SELECT * FROM user_filters GROUP BY user_id, filter_id
+        """
+    sql = """
+            DROP TABLE IF EXISTS user_filters_migration;
+            DROP INDEX IF EXISTS user_filters_unique;
+            CREATE TABLE user_filters_migration (
+                user_id TEXT NOT NULL,
+                filter_id BIGINT NOT NULL,
+                filter_json BYTEA NOT NULL
+            );
+            INSERT INTO user_filters_migration (user_id, filter_id, filter_json)
+                %s;
+            CREATE UNIQUE INDEX user_filters_unique ON user_filters_migration
+                (user_id, filter_id);
+            DROP TABLE user_filters;
+            ALTER TABLE user_filters_migration RENAME TO user_filters;
+        """ % (
+        select_clause,
+    )
+
+    if isinstance(database_engine, PostgresEngine):
+        cur.execute(sql)
+    else:
+        cur.executescript(sql)
diff --git a/synapse/storage/search.py b/synapse/storage/search.py
index df87ab6a6d..7695bf09fc 100644
--- a/synapse/storage/search.py
+++ b/synapse/storage/search.py
@@ -24,6 +24,7 @@ from canonicaljson import json
 from twisted.internet import defer
 
 from synapse.api.errors import SynapseError
+from synapse.storage._base import make_in_list_sql_clause
 from synapse.storage.engines import PostgresEngine, Sqlite3Engine
 
 from .background_updates import BackgroundUpdateStore
@@ -36,7 +37,7 @@ SearchEntry = namedtuple(
 )
 
 
-class SearchStore(BackgroundUpdateStore):
+class SearchBackgroundUpdateStore(BackgroundUpdateStore):
 
     EVENT_SEARCH_UPDATE_NAME = "event_search"
     EVENT_SEARCH_ORDER_UPDATE_NAME = "event_search_order"
@@ -44,7 +45,7 @@ class SearchStore(BackgroundUpdateStore):
     EVENT_SEARCH_USE_GIN_POSTGRES_NAME = "event_search_postgres_gin"
 
     def __init__(self, db_conn, hs):
-        super(SearchStore, self).__init__(db_conn, hs)
+        super(SearchBackgroundUpdateStore, self).__init__(db_conn, hs)
 
         if not hs.config.enable_search:
             return
@@ -289,29 +290,6 @@ class SearchStore(BackgroundUpdateStore):
 
         return num_rows
 
-    def store_event_search_txn(self, txn, event, key, value):
-        """Add event to the search table
-
-        Args:
-            txn (cursor):
-            event (EventBase):
-            key (str):
-            value (str):
-        """
-        self.store_search_entries_txn(
-            txn,
-            (
-                SearchEntry(
-                    key=key,
-                    value=value,
-                    event_id=event.event_id,
-                    room_id=event.room_id,
-                    stream_ordering=event.internal_metadata.stream_ordering,
-                    origin_server_ts=event.origin_server_ts,
-                ),
-            ),
-        )
-
     def store_search_entries_txn(self, txn, entries):
         """Add entries to the search table
 
@@ -358,6 +336,34 @@ class SearchStore(BackgroundUpdateStore):
             # This should be unreachable.
             raise Exception("Unrecognized database engine")
 
+
+class SearchStore(SearchBackgroundUpdateStore):
+    def __init__(self, db_conn, hs):
+        super(SearchStore, self).__init__(db_conn, hs)
+
+    def store_event_search_txn(self, txn, event, key, value):
+        """Add event to the search table
+
+        Args:
+            txn (cursor):
+            event (EventBase):
+            key (str):
+            value (str):
+        """
+        self.store_search_entries_txn(
+            txn,
+            (
+                SearchEntry(
+                    key=key,
+                    value=value,
+                    event_id=event.event_id,
+                    room_id=event.room_id,
+                    stream_ordering=event.internal_metadata.stream_ordering,
+                    origin_server_ts=event.origin_server_ts,
+                ),
+            ),
+        )
+
     @defer.inlineCallbacks
     def search_msgs(self, room_ids, search_term, keys):
         """Performs a full text search over events with given keys.
@@ -380,8 +386,10 @@ class SearchStore(BackgroundUpdateStore):
         # Make sure we don't explode because the person is in too many rooms.
         # We filter the results below regardless.
         if len(room_ids) < 500:
-            clauses.append("room_id IN (%s)" % (",".join(["?"] * len(room_ids)),))
-            args.extend(room_ids)
+            clause, args = make_in_list_sql_clause(
+                self.database_engine, "room_id", room_ids
+            )
+            clauses = [clause]
 
         local_clauses = []
         for key in keys:
@@ -487,8 +495,10 @@ class SearchStore(BackgroundUpdateStore):
         # Make sure we don't explode because the person is in too many rooms.
         # We filter the results below regardless.
         if len(room_ids) < 500:
-            clauses.append("room_id IN (%s)" % (",".join(["?"] * len(room_ids)),))
-            args.extend(room_ids)
+            clause, args = make_in_list_sql_clause(
+                self.database_engine, "room_id", room_ids
+            )
+            clauses = [clause]
 
         local_clauses = []
         for key in keys:
diff --git a/synapse/storage/state.py b/synapse/storage/state.py
index 1980a87108..a941a5ae3f 100644
--- a/synapse/storage/state.py
+++ b/synapse/storage/state.py
@@ -353,8 +353,158 @@ class StateFilter(object):
         return member_filter, non_member_filter
 
 
+class StateGroupBackgroundUpdateStore(SQLBaseStore):
+    """Defines functions related to state groups needed to run the state backgroud
+    updates.
+    """
+
+    def _count_state_group_hops_txn(self, txn, state_group):
+        """Given a state group, count how many hops there are in the tree.
+
+        This is used to ensure the delta chains don't get too long.
+        """
+        if isinstance(self.database_engine, PostgresEngine):
+            sql = """
+                WITH RECURSIVE state(state_group) AS (
+                    VALUES(?::bigint)
+                    UNION ALL
+                    SELECT prev_state_group FROM state_group_edges e, state s
+                    WHERE s.state_group = e.state_group
+                )
+                SELECT count(*) FROM state;
+            """
+
+            txn.execute(sql, (state_group,))
+            row = txn.fetchone()
+            if row and row[0]:
+                return row[0]
+            else:
+                return 0
+        else:
+            # We don't use WITH RECURSIVE on sqlite3 as there are distributions
+            # that ship with an sqlite3 version that doesn't support it (e.g. wheezy)
+            next_group = state_group
+            count = 0
+
+            while next_group:
+                next_group = self._simple_select_one_onecol_txn(
+                    txn,
+                    table="state_group_edges",
+                    keyvalues={"state_group": next_group},
+                    retcol="prev_state_group",
+                    allow_none=True,
+                )
+                if next_group:
+                    count += 1
+
+            return count
+
+    def _get_state_groups_from_groups_txn(
+        self, txn, groups, state_filter=StateFilter.all()
+    ):
+        results = {group: {} for group in groups}
+
+        where_clause, where_args = state_filter.make_sql_filter_clause()
+
+        # Unless the filter clause is empty, we're going to append it after an
+        # existing where clause
+        if where_clause:
+            where_clause = " AND (%s)" % (where_clause,)
+
+        if isinstance(self.database_engine, PostgresEngine):
+            # Temporarily disable sequential scans in this transaction. This is
+            # a temporary hack until we can add the right indices in
+            txn.execute("SET LOCAL enable_seqscan=off")
+
+            # The below query walks the state_group tree so that the "state"
+            # table includes all state_groups in the tree. It then joins
+            # against `state_groups_state` to fetch the latest state.
+            # It assumes that previous state groups are always numerically
+            # lesser.
+            # The PARTITION is used to get the event_id in the greatest state
+            # group for the given type, state_key.
+            # This may return multiple rows per (type, state_key), but last_value
+            # should be the same.
+            sql = """
+                WITH RECURSIVE state(state_group) AS (
+                    VALUES(?::bigint)
+                    UNION ALL
+                    SELECT prev_state_group FROM state_group_edges e, state s
+                    WHERE s.state_group = e.state_group
+                )
+                SELECT DISTINCT type, state_key, last_value(event_id) OVER (
+                    PARTITION BY type, state_key ORDER BY state_group ASC
+                    ROWS BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING
+                ) AS event_id FROM state_groups_state
+                WHERE state_group IN (
+                    SELECT state_group FROM state
+                )
+            """
+
+            for group in groups:
+                args = [group]
+                args.extend(where_args)
+
+                txn.execute(sql + where_clause, args)
+                for row in txn:
+                    typ, state_key, event_id = row
+                    key = (typ, state_key)
+                    results[group][key] = event_id
+        else:
+            max_entries_returned = state_filter.max_entries_returned()
+
+            # We don't use WITH RECURSIVE on sqlite3 as there are distributions
+            # that ship with an sqlite3 version that doesn't support it (e.g. wheezy)
+            for group in groups:
+                next_group = group
+
+                while next_group:
+                    # We did this before by getting the list of group ids, and
+                    # then passing that list to sqlite to get latest event for
+                    # each (type, state_key). However, that was terribly slow
+                    # without the right indices (which we can't add until
+                    # after we finish deduping state, which requires this func)
+                    args = [next_group]
+                    args.extend(where_args)
+
+                    txn.execute(
+                        "SELECT type, state_key, event_id FROM state_groups_state"
+                        " WHERE state_group = ? " + where_clause,
+                        args,
+                    )
+                    results[group].update(
+                        ((typ, state_key), event_id)
+                        for typ, state_key, event_id in txn
+                        if (typ, state_key) not in results[group]
+                    )
+
+                    # If the number of entries in the (type,state_key)->event_id dict
+                    # matches the number of (type,state_keys) types we were searching
+                    # for, then we must have found them all, so no need to go walk
+                    # further down the tree... UNLESS our types filter contained
+                    # wildcards (i.e. Nones) in which case we have to do an exhaustive
+                    # search
+                    if (
+                        max_entries_returned is not None
+                        and len(results[group]) == max_entries_returned
+                    ):
+                        break
+
+                    next_group = self._simple_select_one_onecol_txn(
+                        txn,
+                        table="state_group_edges",
+                        keyvalues={"state_group": next_group},
+                        retcol="prev_state_group",
+                        allow_none=True,
+                    )
+
+        return results
+
+
 # this inherits from EventsWorkerStore because it calls self.get_events
-class StateGroupWorkerStore(EventsWorkerStore, SQLBaseStore):
+class StateGroupWorkerStore(
+    EventsWorkerStore, StateGroupBackgroundUpdateStore, SQLBaseStore
+):
     """The parts of StateGroupStore that can be called from workers.
     """
 
@@ -694,107 +844,6 @@ class StateGroupWorkerStore(EventsWorkerStore, SQLBaseStore):
 
         return results
 
-    def _get_state_groups_from_groups_txn(
-        self, txn, groups, state_filter=StateFilter.all()
-    ):
-        results = {group: {} for group in groups}
-
-        where_clause, where_args = state_filter.make_sql_filter_clause()
-
-        # Unless the filter clause is empty, we're going to append it after an
-        # existing where clause
-        if where_clause:
-            where_clause = " AND (%s)" % (where_clause,)
-
-        if isinstance(self.database_engine, PostgresEngine):
-            # Temporarily disable sequential scans in this transaction. This is
-            # a temporary hack until we can add the right indices in
-            txn.execute("SET LOCAL enable_seqscan=off")
-
-            # The below query walks the state_group tree so that the "state"
-            # table includes all state_groups in the tree. It then joins
-            # against `state_groups_state` to fetch the latest state.
-            # It assumes that previous state groups are always numerically
-            # lesser.
-            # The PARTITION is used to get the event_id in the greatest state
-            # group for the given type, state_key.
-            # This may return multiple rows per (type, state_key), but last_value
-            # should be the same.
-            sql = """
-                WITH RECURSIVE state(state_group) AS (
-                    VALUES(?::bigint)
-                    UNION ALL
-                    SELECT prev_state_group FROM state_group_edges e, state s
-                    WHERE s.state_group = e.state_group
-                )
-                SELECT DISTINCT type, state_key, last_value(event_id) OVER (
-                    PARTITION BY type, state_key ORDER BY state_group ASC
-                    ROWS BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING
-                ) AS event_id FROM state_groups_state
-                WHERE state_group IN (
-                    SELECT state_group FROM state
-                )
-            """
-
-            for group in groups:
-                args = [group]
-                args.extend(where_args)
-
-                txn.execute(sql + where_clause, args)
-                for row in txn:
-                    typ, state_key, event_id = row
-                    key = (typ, state_key)
-                    results[group][key] = event_id
-        else:
-            max_entries_returned = state_filter.max_entries_returned()
-
-            # We don't use WITH RECURSIVE on sqlite3 as there are distributions
-            # that ship with an sqlite3 version that doesn't support it (e.g. wheezy)
-            for group in groups:
-                next_group = group
-
-                while next_group:
-                    # We did this before by getting the list of group ids, and
-                    # then passing that list to sqlite to get latest event for
-                    # each (type, state_key). However, that was terribly slow
-                    # without the right indices (which we can't add until
-                    # after we finish deduping state, which requires this func)
-                    args = [next_group]
-                    args.extend(where_args)
-
-                    txn.execute(
-                        "SELECT type, state_key, event_id FROM state_groups_state"
-                        " WHERE state_group = ? " + where_clause,
-                        args,
-                    )
-                    results[group].update(
-                        ((typ, state_key), event_id)
-                        for typ, state_key, event_id in txn
-                        if (typ, state_key) not in results[group]
-                    )
-
-                    # If the number of entries in the (type,state_key)->event_id dict
-                    # matches the number of (type,state_keys) types we were searching
-                    # for, then we must have found them all, so no need to go walk
-                    # further down the tree... UNLESS our types filter contained
-                    # wildcards (i.e. Nones) in which case we have to do an exhaustive
-                    # search
-                    if (
-                        max_entries_returned is not None
-                        and len(results[group]) == max_entries_returned
-                    ):
-                        break
-
-                    next_group = self._simple_select_one_onecol_txn(
-                        txn,
-                        table="state_group_edges",
-                        keyvalues={"state_group": next_group},
-                        retcol="prev_state_group",
-                        allow_none=True,
-                    )
-
-        return results
-
     @defer.inlineCallbacks
     def get_state_for_events(self, event_ids, state_filter=StateFilter.all()):
         """Given a list of event_ids and type tuples, return a list of state
@@ -1238,66 +1287,10 @@ class StateGroupWorkerStore(EventsWorkerStore, SQLBaseStore):
 
         return self.runInteraction("store_state_group", _store_state_group_txn)
 
-    def _count_state_group_hops_txn(self, txn, state_group):
-        """Given a state group, count how many hops there are in the tree.
-
-        This is used to ensure the delta chains don't get too long.
-        """
-        if isinstance(self.database_engine, PostgresEngine):
-            sql = """
-                WITH RECURSIVE state(state_group) AS (
-                    VALUES(?::bigint)
-                    UNION ALL
-                    SELECT prev_state_group FROM state_group_edges e, state s
-                    WHERE s.state_group = e.state_group
-                )
-                SELECT count(*) FROM state;
-            """
-
-            txn.execute(sql, (state_group,))
-            row = txn.fetchone()
-            if row and row[0]:
-                return row[0]
-            else:
-                return 0
-        else:
-            # We don't use WITH RECURSIVE on sqlite3 as there are distributions
-            # that ship with an sqlite3 version that doesn't support it (e.g. wheezy)
-            next_group = state_group
-            count = 0
-
-            while next_group:
-                next_group = self._simple_select_one_onecol_txn(
-                    txn,
-                    table="state_group_edges",
-                    keyvalues={"state_group": next_group},
-                    retcol="prev_state_group",
-                    allow_none=True,
-                )
-                if next_group:
-                    count += 1
-
-            return count
-
-
-class StateStore(StateGroupWorkerStore, BackgroundUpdateStore):
-    """ Keeps track of the state at a given event.
-
-    This is done by the concept of `state groups`. Every event is a assigned
-    a state group (identified by an arbitrary string), which references a
-    collection of state events. The current state of an event is then the
-    collection of state events referenced by the event's state group.
 
-    Hence, every change in the current state causes a new state group to be
-    generated. However, if no change happens (e.g., if we get a message event
-    with only one parent it inherits the state group from its parent.)
-
-    There are three tables:
-      * `state_groups`: Stores group name, first event with in the group and
-        room id.
-      * `event_to_state_groups`: Maps events to state groups.
-      * `state_groups_state`: Maps state group to state events.
-    """
+class StateBackgroundUpdateStore(
+    StateGroupBackgroundUpdateStore, BackgroundUpdateStore
+):
 
     STATE_GROUP_DEDUPLICATION_UPDATE_NAME = "state_group_state_deduplication"
     STATE_GROUP_INDEX_UPDATE_NAME = "state_group_state_type_index"
@@ -1305,7 +1298,7 @@ class StateStore(StateGroupWorkerStore, BackgroundUpdateStore):
     EVENT_STATE_GROUP_INDEX_UPDATE_NAME = "event_to_state_groups_sg_index"
 
     def __init__(self, db_conn, hs):
-        super(StateStore, self).__init__(db_conn, hs)
+        super(StateBackgroundUpdateStore, self).__init__(db_conn, hs)
         self.register_background_update_handler(
             self.STATE_GROUP_DEDUPLICATION_UPDATE_NAME,
             self._background_deduplicate_state,
@@ -1327,34 +1320,6 @@ class StateStore(StateGroupWorkerStore, BackgroundUpdateStore):
             columns=["state_group"],
         )
 
-    def _store_event_state_mappings_txn(self, txn, events_and_contexts):
-        state_groups = {}
-        for event, context in events_and_contexts:
-            if event.internal_metadata.is_outlier():
-                continue
-
-            # if the event was rejected, just give it the same state as its
-            # predecessor.
-            if context.rejected:
-                state_groups[event.event_id] = context.prev_group
-                continue
-
-            state_groups[event.event_id] = context.state_group
-
-        self._simple_insert_many_txn(
-            txn,
-            table="event_to_state_groups",
-            values=[
-                {"state_group": state_group_id, "event_id": event_id}
-                for event_id, state_group_id in iteritems(state_groups)
-            ],
-        )
-
-        for event_id, state_group_id in iteritems(state_groups):
-            txn.call_after(
-                self._get_state_group_for_event.prefill, (event_id,), state_group_id
-            )
-
     @defer.inlineCallbacks
     def _background_deduplicate_state(self, progress, batch_size):
         """This background update will slowly deduplicate state by reencoding
@@ -1527,3 +1492,54 @@ class StateStore(StateGroupWorkerStore, BackgroundUpdateStore):
         yield self._end_background_update(self.STATE_GROUP_INDEX_UPDATE_NAME)
 
         return 1
+
+
+class StateStore(StateGroupWorkerStore, StateBackgroundUpdateStore):
+    """ Keeps track of the state at a given event.
+
+    This is done by the concept of `state groups`. Every event is a assigned
+    a state group (identified by an arbitrary string), which references a
+    collection of state events. The current state of an event is then the
+    collection of state events referenced by the event's state group.
+
+    Hence, every change in the current state causes a new state group to be
+    generated. However, if no change happens (e.g., if we get a message event
+    with only one parent it inherits the state group from its parent.)
+
+    There are three tables:
+      * `state_groups`: Stores group name, first event with in the group and
+        room id.
+      * `event_to_state_groups`: Maps events to state groups.
+      * `state_groups_state`: Maps state group to state events.
+    """
+
+    def __init__(self, db_conn, hs):
+        super(StateStore, self).__init__(db_conn, hs)
+
+    def _store_event_state_mappings_txn(self, txn, events_and_contexts):
+        state_groups = {}
+        for event, context in events_and_contexts:
+            if event.internal_metadata.is_outlier():
+                continue
+
+            # if the event was rejected, just give it the same state as its
+            # predecessor.
+            if context.rejected:
+                state_groups[event.event_id] = context.prev_group
+                continue
+
+            state_groups[event.event_id] = context.state_group
+
+        self._simple_insert_many_txn(
+            txn,
+            table="event_to_state_groups",
+            values=[
+                {"state_group": state_group_id, "event_id": event_id}
+                for event_id, state_group_id in iteritems(state_groups)
+            ],
+        )
+
+        for event_id, state_group_id in iteritems(state_groups):
+            txn.call_after(
+                self._get_state_group_for_event.prefill, (event_id,), state_group_id
+            )
diff --git a/synapse/storage/state_deltas.py b/synapse/storage/state_deltas.py
index 5fdb442104..28f33ec18f 100644
--- a/synapse/storage/state_deltas.py
+++ b/synapse/storage/state_deltas.py
@@ -21,7 +21,7 @@ logger = logging.getLogger(__name__)
 
 
 class StateDeltasStore(SQLBaseStore):
-    def get_current_state_deltas(self, prev_stream_id):
+    def get_current_state_deltas(self, prev_stream_id: int, max_stream_id: int):
         """Fetch a list of room state changes since the given stream id
 
         Each entry in the result contains the following fields:
@@ -36,15 +36,27 @@ class StateDeltasStore(SQLBaseStore):
 
         Args:
             prev_stream_id (int): point to get changes since (exclusive)
+            max_stream_id (int): the point that we know has been correctly persisted
+               - ie, an upper limit to return changes from.
 
         Returns:
-            Deferred[list[dict]]: results
+            Deferred[tuple[int, list[dict]]: A tuple consisting of:
+               - the stream id which these results go up to
+               - list of current_state_delta_stream rows. If it is empty, we are
+                 up to date.
         """
         prev_stream_id = int(prev_stream_id)
+
+        # check we're not going backwards
+        assert prev_stream_id <= max_stream_id
+
         if not self._curr_state_delta_stream_cache.has_any_entity_changed(
             prev_stream_id
         ):
-            return []
+            # if the CSDs haven't changed between prev_stream_id and now, we
+            # know for certain that they haven't changed between prev_stream_id and
+            # max_stream_id.
+            return max_stream_id, []
 
         def get_current_state_deltas_txn(txn):
             # First we calculate the max stream id that will give us less than
@@ -54,21 +66,29 @@ class StateDeltasStore(SQLBaseStore):
             sql = """
                 SELECT stream_id, count(*)
                 FROM current_state_delta_stream
-                WHERE stream_id > ?
+                WHERE stream_id > ? AND stream_id <= ?
                 GROUP BY stream_id
                 ORDER BY stream_id ASC
                 LIMIT 100
             """
-            txn.execute(sql, (prev_stream_id,))
+            txn.execute(sql, (prev_stream_id, max_stream_id))
 
             total = 0
-            max_stream_id = prev_stream_id
-            for max_stream_id, count in txn:
+
+            for stream_id, count in txn:
                 total += count
                 if total > 100:
                     # We arbitarily limit to 100 entries to ensure we don't
                     # select toooo many.
+                    logger.debug(
+                        "Clipping current_state_delta_stream rows to stream_id %i",
+                        stream_id,
+                    )
+                    clipped_stream_id = stream_id
                     break
+            else:
+                # if there's no problem, we may as well go right up to the max_stream_id
+                clipped_stream_id = max_stream_id
 
             # Now actually get the deltas
             sql = """
@@ -77,8 +97,8 @@ class StateDeltasStore(SQLBaseStore):
                 WHERE ? < stream_id AND stream_id <= ?
                 ORDER BY stream_id ASC
             """
-            txn.execute(sql, (prev_stream_id, max_stream_id))
-            return self.cursor_to_dict(txn)
+            txn.execute(sql, (prev_stream_id, clipped_stream_id))
+            return clipped_stream_id, self.cursor_to_dict(txn)
 
         return self.runInteraction(
             "get_current_state_deltas", get_current_state_deltas_txn
diff --git a/synapse/storage/stats.py b/synapse/storage/stats.py
index 09190d684e..7c224cd3d9 100644
--- a/synapse/storage/stats.py
+++ b/synapse/storage/stats.py
@@ -332,6 +332,9 @@ class StatsStore(StateDeltasStore):
         def _bulk_update_stats_delta_txn(txn):
             for stats_type, stats_updates in updates.items():
                 for stats_id, fields in stats_updates.items():
+                    logger.info(
+                        "Updating %s stats for %s: %s", stats_type, stats_id, fields
+                    )
                     self._update_stats_delta_txn(
                         txn,
                         ts=ts,
diff --git a/synapse/storage/user_directory.py b/synapse/storage/user_directory.py
index b5188d9bee..1b1e4751b9 100644
--- a/synapse/storage/user_directory.py
+++ b/synapse/storage/user_directory.py
@@ -32,14 +32,14 @@ logger = logging.getLogger(__name__)
 TEMP_TABLE = "_temp_populate_user_directory"
 
 
-class UserDirectoryStore(StateDeltasStore, BackgroundUpdateStore):
+class UserDirectoryBackgroundUpdateStore(StateDeltasStore, BackgroundUpdateStore):
 
     # How many records do we calculate before sending it to
     # add_users_who_share_private_rooms?
     SHARE_PRIVATE_WORKING_SET = 500
 
     def __init__(self, db_conn, hs):
-        super(UserDirectoryStore, self).__init__(db_conn, hs)
+        super(UserDirectoryBackgroundUpdateStore, self).__init__(db_conn, hs)
 
         self.server_name = hs.hostname
 
@@ -452,55 +452,6 @@ class UserDirectoryStore(StateDeltasStore, BackgroundUpdateStore):
             "update_profile_in_user_dir", _update_profile_in_user_dir_txn
         )
 
-    def remove_from_user_dir(self, user_id):
-        def _remove_from_user_dir_txn(txn):
-            self._simple_delete_txn(
-                txn, table="user_directory", keyvalues={"user_id": user_id}
-            )
-            self._simple_delete_txn(
-                txn, table="user_directory_search", keyvalues={"user_id": user_id}
-            )
-            self._simple_delete_txn(
-                txn, table="users_in_public_rooms", keyvalues={"user_id": user_id}
-            )
-            self._simple_delete_txn(
-                txn,
-                table="users_who_share_private_rooms",
-                keyvalues={"user_id": user_id},
-            )
-            self._simple_delete_txn(
-                txn,
-                table="users_who_share_private_rooms",
-                keyvalues={"other_user_id": user_id},
-            )
-            txn.call_after(self.get_user_in_directory.invalidate, (user_id,))
-
-        return self.runInteraction("remove_from_user_dir", _remove_from_user_dir_txn)
-
-    @defer.inlineCallbacks
-    def get_users_in_dir_due_to_room(self, room_id):
-        """Get all user_ids that are in the room directory because they're
-        in the given room_id
-        """
-        user_ids_share_pub = yield self._simple_select_onecol(
-            table="users_in_public_rooms",
-            keyvalues={"room_id": room_id},
-            retcol="user_id",
-            desc="get_users_in_dir_due_to_room",
-        )
-
-        user_ids_share_priv = yield self._simple_select_onecol(
-            table="users_who_share_private_rooms",
-            keyvalues={"room_id": room_id},
-            retcol="other_user_id",
-            desc="get_users_in_dir_due_to_room",
-        )
-
-        user_ids = set(user_ids_share_pub)
-        user_ids.update(user_ids_share_priv)
-
-        return user_ids
-
     def add_users_who_share_private_room(self, room_id, user_id_tuples):
         """Insert entries into the users_who_share_private_rooms table. The first
         user should be a local user.
@@ -551,6 +502,98 @@ class UserDirectoryStore(StateDeltasStore, BackgroundUpdateStore):
             "add_users_in_public_rooms", _add_users_in_public_rooms_txn
         )
 
+    def delete_all_from_user_dir(self):
+        """Delete the entire user directory
+        """
+
+        def _delete_all_from_user_dir_txn(txn):
+            txn.execute("DELETE FROM user_directory")
+            txn.execute("DELETE FROM user_directory_search")
+            txn.execute("DELETE FROM users_in_public_rooms")
+            txn.execute("DELETE FROM users_who_share_private_rooms")
+            txn.call_after(self.get_user_in_directory.invalidate_all)
+
+        return self.runInteraction(
+            "delete_all_from_user_dir", _delete_all_from_user_dir_txn
+        )
+
+    @cached()
+    def get_user_in_directory(self, user_id):
+        return self._simple_select_one(
+            table="user_directory",
+            keyvalues={"user_id": user_id},
+            retcols=("display_name", "avatar_url"),
+            allow_none=True,
+            desc="get_user_in_directory",
+        )
+
+    def update_user_directory_stream_pos(self, stream_id):
+        return self._simple_update_one(
+            table="user_directory_stream_pos",
+            keyvalues={},
+            updatevalues={"stream_id": stream_id},
+            desc="update_user_directory_stream_pos",
+        )
+
+
+class UserDirectoryStore(UserDirectoryBackgroundUpdateStore):
+
+    # How many records do we calculate before sending it to
+    # add_users_who_share_private_rooms?
+    SHARE_PRIVATE_WORKING_SET = 500
+
+    def __init__(self, db_conn, hs):
+        super(UserDirectoryStore, self).__init__(db_conn, hs)
+
+    def remove_from_user_dir(self, user_id):
+        def _remove_from_user_dir_txn(txn):
+            self._simple_delete_txn(
+                txn, table="user_directory", keyvalues={"user_id": user_id}
+            )
+            self._simple_delete_txn(
+                txn, table="user_directory_search", keyvalues={"user_id": user_id}
+            )
+            self._simple_delete_txn(
+                txn, table="users_in_public_rooms", keyvalues={"user_id": user_id}
+            )
+            self._simple_delete_txn(
+                txn,
+                table="users_who_share_private_rooms",
+                keyvalues={"user_id": user_id},
+            )
+            self._simple_delete_txn(
+                txn,
+                table="users_who_share_private_rooms",
+                keyvalues={"other_user_id": user_id},
+            )
+            txn.call_after(self.get_user_in_directory.invalidate, (user_id,))
+
+        return self.runInteraction("remove_from_user_dir", _remove_from_user_dir_txn)
+
+    @defer.inlineCallbacks
+    def get_users_in_dir_due_to_room(self, room_id):
+        """Get all user_ids that are in the room directory because they're
+        in the given room_id
+        """
+        user_ids_share_pub = yield self._simple_select_onecol(
+            table="users_in_public_rooms",
+            keyvalues={"room_id": room_id},
+            retcol="user_id",
+            desc="get_users_in_dir_due_to_room",
+        )
+
+        user_ids_share_priv = yield self._simple_select_onecol(
+            table="users_who_share_private_rooms",
+            keyvalues={"room_id": room_id},
+            retcol="other_user_id",
+            desc="get_users_in_dir_due_to_room",
+        )
+
+        user_ids = set(user_ids_share_pub)
+        user_ids.update(user_ids_share_priv)
+
+        return user_ids
+
     def remove_user_who_share_room(self, user_id, room_id):
         """
         Deletes entries in the users_who_share_*_rooms table. The first
@@ -637,31 +680,6 @@ class UserDirectoryStore(StateDeltasStore, BackgroundUpdateStore):
 
         return [room_id for room_id, in rows]
 
-    def delete_all_from_user_dir(self):
-        """Delete the entire user directory
-        """
-
-        def _delete_all_from_user_dir_txn(txn):
-            txn.execute("DELETE FROM user_directory")
-            txn.execute("DELETE FROM user_directory_search")
-            txn.execute("DELETE FROM users_in_public_rooms")
-            txn.execute("DELETE FROM users_who_share_private_rooms")
-            txn.call_after(self.get_user_in_directory.invalidate_all)
-
-        return self.runInteraction(
-            "delete_all_from_user_dir", _delete_all_from_user_dir_txn
-        )
-
-    @cached()
-    def get_user_in_directory(self, user_id):
-        return self._simple_select_one(
-            table="user_directory",
-            keyvalues={"user_id": user_id},
-            retcols=("display_name", "avatar_url"),
-            allow_none=True,
-            desc="get_user_in_directory",
-        )
-
     def get_user_directory_stream_pos(self):
         return self._simple_select_one_onecol(
             table="user_directory_stream_pos",
@@ -670,14 +688,6 @@ class UserDirectoryStore(StateDeltasStore, BackgroundUpdateStore):
             desc="get_user_directory_stream_pos",
         )
 
-    def update_user_directory_stream_pos(self, stream_id):
-        return self._simple_update_one(
-            table="user_directory_stream_pos",
-            keyvalues={},
-            updatevalues={"stream_id": stream_id},
-            desc="update_user_directory_stream_pos",
-        )
-
     @defer.inlineCallbacks
     def search_user_dir(self, user_id, search_term, limit):
         """Searches for users in directory
diff --git a/synapse/storage/user_erasure_store.py b/synapse/storage/user_erasure_store.py
index 05cabc2282..aa4f0da5f0 100644
--- a/synapse/storage/user_erasure_store.py
+++ b/synapse/storage/user_erasure_store.py
@@ -56,15 +56,15 @@ class UserErasureWorkerStore(SQLBaseStore):
         # iterate it multiple times, and (b) avoiding duplicates.
         user_ids = tuple(set(user_ids))
 
-        def _get_erased_users(txn):
-            txn.execute(
-                "SELECT user_id FROM erased_users WHERE user_id IN (%s)"
-                % (",".join("?" * len(user_ids))),
-                user_ids,
-            )
-            return set(r[0] for r in txn)
-
-        erased_users = yield self.runInteraction("are_users_erased", _get_erased_users)
+        rows = yield self._simple_select_many_batch(
+            table="erased_users",
+            column="user_id",
+            iterable=user_ids,
+            retcols=("user_id",),
+            desc="are_users_erased",
+        )
+        erased_users = set(row["user_id"] for row in rows)
+
         res = dict((u, u in erased_users) for u in user_ids)
         return res
 
diff --git a/synapse/types.py b/synapse/types.py
index 51eadb6ad4..8f79797f17 100644
--- a/synapse/types.py
+++ b/synapse/types.py
@@ -318,6 +318,7 @@ class StreamToken(
     )
 ):
     _SEPARATOR = "_"
+    START = None  # type: StreamToken
 
     @classmethod
     def from_string(cls, string):
@@ -402,7 +403,7 @@ class RoomStreamToken(namedtuple("_StreamToken", "topological stream")):
     followed by the "stream_ordering" id of the event it comes after.
     """
 
-    __slots__ = []
+    __slots__ = []  # type: list
 
     @classmethod
     def parse(cls, string):
diff --git a/synapse/util/async_helpers.py b/synapse/util/async_helpers.py
index f1c46836b1..0d3bdd88ce 100644
--- a/synapse/util/async_helpers.py
+++ b/synapse/util/async_helpers.py
@@ -13,9 +13,11 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
+
 import collections
 import logging
 from contextlib import contextmanager
+from typing import Dict, Sequence, Set, Union
 
 from six.moves import range
 
@@ -213,7 +215,9 @@ class Linearizer(object):
         # the first element is the number of things executing, and
         # the second element is an OrderedDict, where the keys are deferreds for the
         # things blocked from executing.
-        self.key_to_defer = {}
+        self.key_to_defer = (
+            {}
+        )  # type: Dict[str, Sequence[Union[int, Dict[defer.Deferred, int]]]]
 
     def queue(self, key):
         # we avoid doing defer.inlineCallbacks here, so that cancellation works correctly.
@@ -340,10 +344,10 @@ class ReadWriteLock(object):
 
     def __init__(self):
         # Latest readers queued
-        self.key_to_current_readers = {}
+        self.key_to_current_readers = {}  # type: Dict[str, Set[defer.Deferred]]
 
         # Latest writer queued
-        self.key_to_current_writer = {}
+        self.key_to_current_writer = {}  # type: Dict[str, defer.Deferred]
 
     @defer.inlineCallbacks
     def read(self, key):
diff --git a/synapse/util/caches/__init__.py b/synapse/util/caches/__init__.py
index b50e3503f0..43fd65d693 100644
--- a/synapse/util/caches/__init__.py
+++ b/synapse/util/caches/__init__.py
@@ -16,6 +16,7 @@
 
 import logging
 import os
+from typing import Dict
 
 import six
 from six.moves import intern
@@ -37,7 +38,7 @@ def get_cache_factor_for(cache_name):
 
 
 caches_by_name = {}
-collectors_by_name = {}
+collectors_by_name = {}  # type: Dict
 
 cache_size = Gauge("synapse_util_caches_cache:size", "", ["name"])
 cache_hits = Gauge("synapse_util_caches_cache:hits", "", ["name"])
diff --git a/synapse/util/caches/descriptors.py b/synapse/util/caches/descriptors.py
index 43f66ec4be..5ac2530a6a 100644
--- a/synapse/util/caches/descriptors.py
+++ b/synapse/util/caches/descriptors.py
@@ -18,10 +18,12 @@ import inspect
 import logging
 import threading
 from collections import namedtuple
+from typing import Any, cast
 
 from six import itervalues
 
 from prometheus_client import Gauge
+from typing_extensions import Protocol
 
 from twisted.internet import defer
 
@@ -37,6 +39,18 @@ from . import register_cache
 logger = logging.getLogger(__name__)
 
 
+class _CachedFunction(Protocol):
+    invalidate = None  # type: Any
+    invalidate_all = None  # type: Any
+    invalidate_many = None  # type: Any
+    prefill = None  # type: Any
+    cache = None  # type: Any
+    num_args = None  # type: Any
+
+    def __name__(self):
+        ...
+
+
 cache_pending_metric = Gauge(
     "synapse_util_caches_cache_pending",
     "Number of lookups currently pending for this cache",
@@ -245,7 +259,9 @@ class Cache(object):
 
 
 class _CacheDescriptorBase(object):
-    def __init__(self, orig, num_args, inlineCallbacks, cache_context=False):
+    def __init__(
+        self, orig: _CachedFunction, num_args, inlineCallbacks, cache_context=False
+    ):
         self.orig = orig
 
         if inlineCallbacks:
@@ -404,7 +420,7 @@ class CacheDescriptor(_CacheDescriptorBase):
                 return tuple(get_cache_key_gen(args, kwargs))
 
         @functools.wraps(self.orig)
-        def wrapped(*args, **kwargs):
+        def _wrapped(*args, **kwargs):
             # If we're passed a cache_context then we'll want to call its invalidate()
             # whenever we are invalidated
             invalidate_callback = kwargs.pop("on_invalidate", None)
@@ -440,6 +456,8 @@ class CacheDescriptor(_CacheDescriptorBase):
 
             return make_deferred_yieldable(observer)
 
+        wrapped = cast(_CachedFunction, _wrapped)
+
         if self.num_args == 1:
             wrapped.invalidate = lambda key: cache.invalidate(key[0])
             wrapped.prefill = lambda key, val: cache.prefill(key[0], val)
diff --git a/synapse/util/caches/treecache.py b/synapse/util/caches/treecache.py
index 9a72218d85..2ea4e4e911 100644
--- a/synapse/util/caches/treecache.py
+++ b/synapse/util/caches/treecache.py
@@ -1,3 +1,5 @@
+from typing import Dict
+
 from six import itervalues
 
 SENTINEL = object()
@@ -12,7 +14,7 @@ class TreeCache(object):
 
     def __init__(self):
         self.size = 0
-        self.root = {}
+        self.root = {}  # type: Dict
 
     def __setitem__(self, key, value):
         return self.set(key, value)
diff --git a/synapse/util/metrics.py b/synapse/util/metrics.py
index 0910930c21..4b1bcdf23c 100644
--- a/synapse/util/metrics.py
+++ b/synapse/util/metrics.py
@@ -60,12 +60,14 @@ in_flight = InFlightGauge(
 )
 
 
-def measure_func(name):
+def measure_func(name=None):
     def wrapper(func):
+        block_name = func.__name__ if name is None else name
+
         @wraps(func)
         @defer.inlineCallbacks
         def measured_func(self, *args, **kwargs):
-            with Measure(self.clock, name):
+            with Measure(self.clock, block_name):
                 r = yield func(self, *args, **kwargs)
             return r
 
diff --git a/synapse/util/module_loader.py b/synapse/util/module_loader.py
index 7ff7eb1e4d..2705cbe5f8 100644
--- a/synapse/util/module_loader.py
+++ b/synapse/util/module_loader.py
@@ -54,5 +54,5 @@ def load_python_module(location: str):
     if spec is None:
         raise Exception("Unable to load module at %s" % (location,))
     mod = importlib.util.module_from_spec(spec)
-    spec.loader.exec_module(mod)
+    spec.loader.exec_module(mod)  # type: ignore
     return mod
diff --git a/synapse/util/patch_inline_callbacks.py b/synapse/util/patch_inline_callbacks.py
new file mode 100644
index 0000000000..3925927f9f
--- /dev/null
+++ b/synapse/util/patch_inline_callbacks.py
@@ -0,0 +1,219 @@
+# -*- coding: utf-8 -*-
+# Copyright 2018 New Vector Ltd
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from __future__ import print_function
+
+import functools
+import sys
+from typing import Any, Callable, List
+
+from twisted.internet import defer
+from twisted.internet.defer import Deferred
+from twisted.python.failure import Failure
+
+# Tracks if we've already patched inlineCallbacks
+_already_patched = False
+
+
+def do_patch():
+    """
+    Patch defer.inlineCallbacks so that it checks the state of the logcontext on exit
+    """
+
+    from synapse.logging.context import LoggingContext
+
+    global _already_patched
+
+    orig_inline_callbacks = defer.inlineCallbacks
+    if _already_patched:
+        return
+
+    def new_inline_callbacks(f):
+        @functools.wraps(f)
+        def wrapped(*args, **kwargs):
+            start_context = LoggingContext.current_context()
+            changes = []  # type: List[str]
+            orig = orig_inline_callbacks(_check_yield_points(f, changes))
+
+            try:
+                res = orig(*args, **kwargs)
+            except Exception:
+                if LoggingContext.current_context() != start_context:
+                    for err in changes:
+                        print(err, file=sys.stderr)
+
+                    err = "%s changed context from %s to %s on exception" % (
+                        f,
+                        start_context,
+                        LoggingContext.current_context(),
+                    )
+                    print(err, file=sys.stderr)
+                    raise Exception(err)
+                raise
+
+            if not isinstance(res, Deferred) or res.called:
+                if LoggingContext.current_context() != start_context:
+                    for err in changes:
+                        print(err, file=sys.stderr)
+
+                    err = "Completed %s changed context from %s to %s" % (
+                        f,
+                        start_context,
+                        LoggingContext.current_context(),
+                    )
+                    # print the error to stderr because otherwise all we
+                    # see in travis-ci is the 500 error
+                    print(err, file=sys.stderr)
+                    raise Exception(err)
+                return res
+
+            if LoggingContext.current_context() != LoggingContext.sentinel:
+                err = (
+                    "%s returned incomplete deferred in non-sentinel context "
+                    "%s (start was %s)"
+                ) % (f, LoggingContext.current_context(), start_context)
+                print(err, file=sys.stderr)
+                raise Exception(err)
+
+            def check_ctx(r):
+                if LoggingContext.current_context() != start_context:
+                    for err in changes:
+                        print(err, file=sys.stderr)
+                    err = "%s completion of %s changed context from %s to %s" % (
+                        "Failure" if isinstance(r, Failure) else "Success",
+                        f,
+                        start_context,
+                        LoggingContext.current_context(),
+                    )
+                    print(err, file=sys.stderr)
+                    raise Exception(err)
+                return r
+
+            res.addBoth(check_ctx)
+            return res
+
+        return wrapped
+
+    defer.inlineCallbacks = new_inline_callbacks
+    _already_patched = True
+
+
+def _check_yield_points(f: Callable, changes: List[str]):
+    """Wraps a generator that is about to be passed to defer.inlineCallbacks
+    checking that after every yield the log contexts are correct.
+
+    It's perfectly valid for log contexts to change within a function, e.g. due
+    to new Measure blocks, so such changes are added to the given `changes`
+    list instead of triggering an exception.
+
+    Args:
+        f: generator function to wrap
+        changes: A list of strings detailing how the contexts
+            changed within a function.
+
+    Returns:
+        function
+    """
+
+    from synapse.logging.context import LoggingContext
+
+    @functools.wraps(f)
+    def check_yield_points_inner(*args, **kwargs):
+        gen = f(*args, **kwargs)
+
+        last_yield_line_no = gen.gi_frame.f_lineno
+        result = None  # type: Any
+        while True:
+            expected_context = LoggingContext.current_context()
+
+            try:
+                isFailure = isinstance(result, Failure)
+                if isFailure:
+                    d = result.throwExceptionIntoGenerator(gen)
+                else:
+                    d = gen.send(result)
+            except (StopIteration, defer._DefGen_Return) as e:
+                if LoggingContext.current_context() != expected_context:
+                    # This happens when the context is lost sometime *after* the
+                    # final yield and returning. E.g. we forgot to yield on a
+                    # function that returns a deferred.
+                    #
+                    # We don't raise here as it's perfectly valid for contexts to
+                    # change in a function, as long as it sets the correct context
+                    # on resolving (which is checked separately).
+                    err = (
+                        "Function %r returned and changed context from %s to %s,"
+                        " in %s between %d and end of func"
+                        % (
+                            f.__qualname__,
+                            expected_context,
+                            LoggingContext.current_context(),
+                            f.__code__.co_filename,
+                            last_yield_line_no,
+                        )
+                    )
+                    changes.append(err)
+                return getattr(e, "value", None)
+
+            frame = gen.gi_frame
+
+            if isinstance(d, defer.Deferred) and not d.called:
+                # This happens if we yield on a deferred that doesn't follow
+                # the log context rules without wrapping in a `make_deferred_yieldable`.
+                # We raise here as this should never happen.
+                if LoggingContext.current_context() is not LoggingContext.sentinel:
+                    err = (
+                        "%s yielded with context %s rather than sentinel,"
+                        " yielded on line %d in %s"
+                        % (
+                            frame.f_code.co_name,
+                            LoggingContext.current_context(),
+                            frame.f_lineno,
+                            frame.f_code.co_filename,
+                        )
+                    )
+                    raise Exception(err)
+
+            try:
+                result = yield d
+            except Exception as e:
+                result = Failure(e)
+
+            if LoggingContext.current_context() != expected_context:
+
+                # This happens because the context is lost sometime *after* the
+                # previous yield and *after* the current yield. E.g. the
+                # deferred we waited on didn't follow the rules, or we forgot to
+                # yield on a function between the two yield points.
+                #
+                # We don't raise here as its perfectly valid for contexts to
+                # change in a function, as long as it sets the correct context
+                # on resolving (which is checked separately).
+                err = (
+                    "%s changed context from %s to %s, happened between lines %d and %d in %s"
+                    % (
+                        frame.f_code.co_name,
+                        expected_context,
+                        LoggingContext.current_context(),
+                        last_yield_line_no,
+                        frame.f_lineno,
+                        frame.f_code.co_filename,
+                    )
+                )
+                changes.append(err)
+
+            last_yield_line_no = frame.f_lineno
+
+    return check_yield_points_inner
diff --git a/tests/__init__.py b/tests/__init__.py
index f7fc502f01..ed805db1c2 100644
--- a/tests/__init__.py
+++ b/tests/__init__.py
@@ -16,9 +16,9 @@
 
 from twisted.trial import util
 
-import tests.patch_inline_callbacks
+from synapse.util.patch_inline_callbacks import do_patch
 
 # attempt to do the patch before we load any synapse code
-tests.patch_inline_callbacks.do_patch()
+do_patch()
 
 util.DEFAULT_TIMEOUT_DURATION = 20
diff --git a/tests/config/test_tls.py b/tests/config/test_tls.py
index b02780772a..1be6ff563b 100644
--- a/tests/config/test_tls.py
+++ b/tests/config/test_tls.py
@@ -21,17 +21,24 @@ import yaml
 
 from OpenSSL import SSL
 
+from synapse.config._base import Config, RootConfig
 from synapse.config.tls import ConfigError, TlsConfig
 from synapse.crypto.context_factory import ClientTLSOptionsFactory
 
 from tests.unittest import TestCase
 
 
-class TestConfig(TlsConfig):
+class FakeServer(Config):
+    section = "server"
+
     def has_tls_listener(self):
         return False
 
 
+class TestConfig(RootConfig):
+    config_classes = [FakeServer, TlsConfig]
+
+
 class TLSConfigTests(TestCase):
     def test_warn_self_signed(self):
         """
@@ -202,13 +209,13 @@ s4niecZKPBizL6aucT59CsunNmmb5Glq8rlAcU+1ZTZZzGYqVYhF6axB9Qg=
         conf = TestConfig()
         conf.read_config(
             yaml.safe_load(
-                TestConfig().generate_config_section(
+                TestConfig().generate_config(
                     "/config_dir_path",
                     "my_super_secure_server",
                     "/data_dir_path",
-                    "/tls_cert_path",
-                    "tls_private_key",
-                    None,  # This is the acme_domain
+                    tls_certificate_path="/tls_cert_path",
+                    tls_private_key_path="tls_private_key",
+                    acme_domain=None,  # This is the acme_domain
                 )
             ),
             "/config_dir_path",
@@ -223,13 +230,13 @@ s4niecZKPBizL6aucT59CsunNmmb5Glq8rlAcU+1ZTZZzGYqVYhF6axB9Qg=
         conf = TestConfig()
         conf.read_config(
             yaml.safe_load(
-                TestConfig().generate_config_section(
+                TestConfig().generate_config(
                     "/config_dir_path",
                     "my_super_secure_server",
                     "/data_dir_path",
-                    "/tls_cert_path",
-                    "tls_private_key",
-                    "my_supe_secure_server",  # This is the acme_domain
+                    tls_certificate_path="/tls_cert_path",
+                    tls_private_key_path="tls_private_key",
+                    acme_domain="my_supe_secure_server",  # This is the acme_domain
                 )
             ),
             "/config_dir_path",
diff --git a/tests/handlers/test_e2e_room_keys.py b/tests/handlers/test_e2e_room_keys.py
index c4503c1611..0bb96674a2 100644
--- a/tests/handlers/test_e2e_room_keys.py
+++ b/tests/handlers/test_e2e_room_keys.py
@@ -187,9 +187,8 @@ class E2eRoomKeysHandlerTestCase(unittest.TestCase):
         self.assertEqual(res, 404)
 
     @defer.inlineCallbacks
-    def test_update_bad_version(self):
-        """Check that we get a 400 if the version in the body is missing or
-        doesn't match
+    def test_update_omitted_version(self):
+        """Check that the update succeeds if the version is missing from the body
         """
         version = yield self.handler.create_version(
             self.local_user,
@@ -197,19 +196,35 @@ class E2eRoomKeysHandlerTestCase(unittest.TestCase):
         )
         self.assertEqual(version, "1")
 
-        res = None
-        try:
-            yield self.handler.update_version(
-                self.local_user,
-                version,
-                {
-                    "algorithm": "m.megolm_backup.v1",
-                    "auth_data": "revised_first_version_auth_data",
-                },
-            )
-        except errors.SynapseError as e:
-            res = e.code
-        self.assertEqual(res, 400)
+        yield self.handler.update_version(
+            self.local_user,
+            version,
+            {
+                "algorithm": "m.megolm_backup.v1",
+                "auth_data": "revised_first_version_auth_data",
+            },
+        )
+
+        # check we can retrieve it as the current version
+        res = yield self.handler.get_version_info(self.local_user)
+        self.assertDictEqual(
+            res,
+            {
+                "algorithm": "m.megolm_backup.v1",
+                "auth_data": "revised_first_version_auth_data",
+                "version": version,
+            },
+        )
+
+    @defer.inlineCallbacks
+    def test_update_bad_version(self):
+        """Check that we get a 400 if the version in the body doesn't match
+        """
+        version = yield self.handler.create_version(
+            self.local_user,
+            {"algorithm": "m.megolm_backup.v1", "auth_data": "first_version_auth_data"},
+        )
+        self.assertEqual(version, "1")
 
         res = None
         try:
diff --git a/tests/handlers/test_federation.py b/tests/handlers/test_federation.py
new file mode 100644
index 0000000000..d56220f403
--- /dev/null
+++ b/tests/handlers/test_federation.py
@@ -0,0 +1,81 @@
+# -*- coding: utf-8 -*-
+# Copyright 2019 The Matrix.org Foundation C.I.C.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+from synapse.api.constants import EventTypes
+from synapse.api.errors import AuthError, Codes
+from synapse.rest import admin
+from synapse.rest.client.v1 import login, room
+
+from tests import unittest
+
+
+class FederationTestCase(unittest.HomeserverTestCase):
+    servlets = [
+        admin.register_servlets,
+        login.register_servlets,
+        room.register_servlets,
+    ]
+
+    def make_homeserver(self, reactor, clock):
+        hs = self.setup_test_homeserver(http_client=None)
+        self.handler = hs.get_handlers().federation_handler
+        self.store = hs.get_datastore()
+        return hs
+
+    def test_exchange_revoked_invite(self):
+        user_id = self.register_user("kermit", "test")
+        tok = self.login("kermit", "test")
+
+        room_id = self.helper.create_room_as(room_creator=user_id, tok=tok)
+
+        # Send a 3PID invite event with an empty body so it's considered as a revoked one.
+        invite_token = "sometoken"
+        self.helper.send_state(
+            room_id=room_id,
+            event_type=EventTypes.ThirdPartyInvite,
+            state_key=invite_token,
+            body={},
+            tok=tok,
+        )
+
+        d = self.handler.on_exchange_third_party_invite_request(
+            room_id=room_id,
+            event_dict={
+                "type": EventTypes.Member,
+                "room_id": room_id,
+                "sender": user_id,
+                "state_key": "@someone:example.org",
+                "content": {
+                    "membership": "invite",
+                    "third_party_invite": {
+                        "display_name": "alice",
+                        "signed": {
+                            "mxid": "@alice:localhost",
+                            "token": invite_token,
+                            "signatures": {
+                                "magic.forest": {
+                                    "ed25519:3": "fQpGIW1Snz+pwLZu6sTy2aHy/DYWWTspTJRPyNp0PKkymfIsNffysMl6ObMMFdIJhk6g6pwlIqZ54rxo8SLmAg"
+                                }
+                            },
+                        },
+                    },
+                },
+            },
+        )
+
+        failure = self.get_failure(d, AuthError).value
+
+        self.assertEqual(failure.code, 403, failure)
+        self.assertEqual(failure.errcode, Codes.FORBIDDEN, failure)
+        self.assertEqual(failure.msg, "You are not invited to this room.")
diff --git a/tests/handlers/test_roomlist.py b/tests/handlers/test_roomlist.py
deleted file mode 100644
index 61eebb6985..0000000000
--- a/tests/handlers/test_roomlist.py
+++ /dev/null
@@ -1,39 +0,0 @@
-# -*- coding: utf-8 -*-
-# Copyright 2018 New Vector Ltd
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-from synapse.handlers.room_list import RoomListNextBatch
-
-import tests.unittest
-import tests.utils
-
-
-class RoomListTestCase(tests.unittest.TestCase):
-    """ Tests RoomList's RoomListNextBatch. """
-
-    def setUp(self):
-        pass
-
-    def test_check_read_batch_tokens(self):
-        batch_token = RoomListNextBatch(
-            stream_ordering="abcdef",
-            public_room_stream_id="123",
-            current_limit=20,
-            direction_is_forward=True,
-        ).to_token()
-        next_batch = RoomListNextBatch.from_token(batch_token)
-        self.assertEquals(next_batch.stream_ordering, "abcdef")
-        self.assertEquals(next_batch.public_room_stream_id, "123")
-        self.assertEquals(next_batch.current_limit, 20)
-        self.assertEquals(next_batch.direction_is_forward, True)
diff --git a/tests/handlers/test_typing.py b/tests/handlers/test_typing.py
index 1f2ef5d01f..67f1013051 100644
--- a/tests/handlers/test_typing.py
+++ b/tests/handlers/test_typing.py
@@ -139,7 +139,7 @@ class TypingNotificationsTestCase(unittest.HomeserverTestCase):
             defer.succeed(1)
         )
 
-        self.datastore.get_current_state_deltas.return_value = None
+        self.datastore.get_current_state_deltas.return_value = (0, None)
 
         self.datastore.get_to_device_stream_token = lambda: 0
         self.datastore.get_new_device_msgs_for_remote = lambda *args, **kargs: ([], 0)
diff --git a/tests/patch_inline_callbacks.py b/tests/patch_inline_callbacks.py
deleted file mode 100644
index 220884311c..0000000000
--- a/tests/patch_inline_callbacks.py
+++ /dev/null
@@ -1,94 +0,0 @@
-# -*- coding: utf-8 -*-
-# Copyright 2018 New Vector Ltd
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-from __future__ import print_function
-
-import functools
-import sys
-
-from twisted.internet import defer
-from twisted.internet.defer import Deferred
-from twisted.python.failure import Failure
-
-
-def do_patch():
-    """
-    Patch defer.inlineCallbacks so that it checks the state of the logcontext on exit
-    """
-
-    from synapse.logging.context import LoggingContext
-
-    orig_inline_callbacks = defer.inlineCallbacks
-
-    def new_inline_callbacks(f):
-
-        orig = orig_inline_callbacks(f)
-
-        @functools.wraps(f)
-        def wrapped(*args, **kwargs):
-            start_context = LoggingContext.current_context()
-
-            try:
-                res = orig(*args, **kwargs)
-            except Exception:
-                if LoggingContext.current_context() != start_context:
-                    err = "%s changed context from %s to %s on exception" % (
-                        f,
-                        start_context,
-                        LoggingContext.current_context(),
-                    )
-                    print(err, file=sys.stderr)
-                    raise Exception(err)
-                raise
-
-            if not isinstance(res, Deferred) or res.called:
-                if LoggingContext.current_context() != start_context:
-                    err = "%s changed context from %s to %s" % (
-                        f,
-                        start_context,
-                        LoggingContext.current_context(),
-                    )
-                    # print the error to stderr because otherwise all we
-                    # see in travis-ci is the 500 error
-                    print(err, file=sys.stderr)
-                    raise Exception(err)
-                return res
-
-            if LoggingContext.current_context() != LoggingContext.sentinel:
-                err = (
-                    "%s returned incomplete deferred in non-sentinel context "
-                    "%s (start was %s)"
-                ) % (f, LoggingContext.current_context(), start_context)
-                print(err, file=sys.stderr)
-                raise Exception(err)
-
-            def check_ctx(r):
-                if LoggingContext.current_context() != start_context:
-                    err = "%s completion of %s changed context from %s to %s" % (
-                        "Failure" if isinstance(r, Failure) else "Success",
-                        f,
-                        start_context,
-                        LoggingContext.current_context(),
-                    )
-                    print(err, file=sys.stderr)
-                    raise Exception(err)
-                return r
-
-            res.addBoth(check_ctx)
-            return res
-
-        return wrapped
-
-    defer.inlineCallbacks = new_inline_callbacks
diff --git a/tests/rest/admin/test_admin.py b/tests/rest/admin/test_admin.py
index 5877bb2133..d3a4f717f7 100644
--- a/tests/rest/admin/test_admin.py
+++ b/tests/rest/admin/test_admin.py
@@ -62,7 +62,7 @@ class UserRegisterTestCase(unittest.HomeserverTestCase):
         self.device_handler.check_device_registered = Mock(return_value="FAKE")
 
         self.datastore = Mock(return_value=Mock())
-        self.datastore.get_current_state_deltas = Mock(return_value=[])
+        self.datastore.get_current_state_deltas = Mock(return_value=(0, []))
 
         self.secrets = Mock()
 
diff --git a/tests/rest/client/v1/test_rooms.py b/tests/rest/client/v1/test_rooms.py
index fe741637f5..2f2ca74611 100644
--- a/tests/rest/client/v1/test_rooms.py
+++ b/tests/rest/client/v1/test_rooms.py
@@ -484,6 +484,15 @@ class RoomsCreateTestCase(RoomBase):
         self.render(request)
         self.assertEquals(400, channel.code)
 
+    def test_post_room_invitees_invalid_mxid(self):
+        # POST with invalid invitee, see https://github.com/matrix-org/synapse/issues/4088
+        # Note the trailing space in the MXID here!
+        request, channel = self.make_request(
+            "POST", "/createRoom", b'{"invite":["@alice:example.com "]}'
+        )
+        self.render(request)
+        self.assertEquals(400, channel.code)
+
 
 class RoomTopicTestCase(RoomBase):
     """ Tests /rooms/$room_id/topic REST events. """
diff --git a/tests/rest/client/v2_alpha/test_account.py b/tests/rest/client/v2_alpha/test_account.py
index 920de41de4..0f51895b81 100644
--- a/tests/rest/client/v2_alpha/test_account.py
+++ b/tests/rest/client/v2_alpha/test_account.py
@@ -23,8 +23,8 @@ from email.parser import Parser
 import pkg_resources
 
 import synapse.rest.admin
-from synapse.api.constants import LoginType
-from synapse.rest.client.v1 import login
+from synapse.api.constants import LoginType, Membership
+from synapse.rest.client.v1 import login, room
 from synapse.rest.client.v2_alpha import account, register
 
 from tests import unittest
@@ -244,16 +244,66 @@ class DeactivateTestCase(unittest.HomeserverTestCase):
         synapse.rest.admin.register_servlets_for_client_rest_resource,
         login.register_servlets,
         account.register_servlets,
+        room.register_servlets,
     ]
 
     def make_homeserver(self, reactor, clock):
-        hs = self.setup_test_homeserver()
-        return hs
+        self.hs = self.setup_test_homeserver()
+        return self.hs
 
     def test_deactivate_account(self):
         user_id = self.register_user("kermit", "test")
         tok = self.login("kermit", "test")
 
+        self.deactivate(user_id, tok)
+
+        store = self.hs.get_datastore()
+
+        # Check that the user has been marked as deactivated.
+        self.assertTrue(self.get_success(store.get_user_deactivated_status(user_id)))
+
+        # Check that this access token has been invalidated.
+        request, channel = self.make_request("GET", "account/whoami")
+        self.render(request)
+        self.assertEqual(request.code, 401)
+
+    @unittest.INFO
+    def test_pending_invites(self):
+        """Tests that deactivating a user rejects every pending invite for them."""
+        store = self.hs.get_datastore()
+
+        inviter_id = self.register_user("inviter", "test")
+        inviter_tok = self.login("inviter", "test")
+
+        invitee_id = self.register_user("invitee", "test")
+        invitee_tok = self.login("invitee", "test")
+
+        # Make @inviter:test invite @invitee:test in a new room.
+        room_id = self.helper.create_room_as(inviter_id, tok=inviter_tok)
+        self.helper.invite(
+            room=room_id, src=inviter_id, targ=invitee_id, tok=inviter_tok
+        )
+
+        # Make sure the invite is here.
+        pending_invites = self.get_success(store.get_invited_rooms_for_user(invitee_id))
+        self.assertEqual(len(pending_invites), 1, pending_invites)
+        self.assertEqual(pending_invites[0].room_id, room_id, pending_invites)
+
+        # Deactivate @invitee:test.
+        self.deactivate(invitee_id, invitee_tok)
+
+        # Check that the invite isn't there anymore.
+        pending_invites = self.get_success(store.get_invited_rooms_for_user(invitee_id))
+        self.assertEqual(len(pending_invites), 0, pending_invites)
+
+        # Check that the membership of @invitee:test in the room is now "leave".
+        memberships = self.get_success(
+            store.get_rooms_for_user_where_membership_is(invitee_id, [Membership.LEAVE])
+        )
+        self.assertEqual(len(memberships), 1, memberships)
+        self.assertEqual(memberships[0].room_id, room_id, memberships)
+
+    def deactivate(self, user_id, tok):
         request_data = json.dumps(
             {
                 "auth": {
@@ -269,13 +319,3 @@ class DeactivateTestCase(unittest.HomeserverTestCase):
         )
         self.render(request)
         self.assertEqual(request.code, 200)
-
-        store = self.hs.get_datastore()
-
-        # Check that the user has been marked as deactivated.
-        self.assertTrue(self.get_success(store.get_user_deactivated_status(user_id)))
-
-        # Check that this access token has been invalidated.
-        request, channel = self.make_request("GET", "account/whoami")
-        self.render(request)
-        self.assertEqual(request.code, 401)
diff --git a/tests/rest/client/v2_alpha/test_filter.py b/tests/rest/client/v2_alpha/test_filter.py
index f42a8efbf4..e0e9e94fbf 100644
--- a/tests/rest/client/v2_alpha/test_filter.py
+++ b/tests/rest/client/v2_alpha/test_filter.py
@@ -92,7 +92,7 @@ class FilterTestCase(unittest.HomeserverTestCase):
         )
         self.render(request)
 
-        self.assertEqual(channel.result["code"], b"400")
+        self.assertEqual(channel.result["code"], b"404")
         self.assertEquals(channel.json_body["errcode"], Codes.NOT_FOUND)
 
     # Currently invalid params do not have an appropriate errcode
diff --git a/tests/storage/test_end_to_end_keys.py b/tests/storage/test_end_to_end_keys.py
index c8ece15284..398d546280 100644
--- a/tests/storage/test_end_to_end_keys.py
+++ b/tests/storage/test_end_to_end_keys.py
@@ -38,7 +38,7 @@ class EndToEndKeyStoreTestCase(tests.unittest.TestCase):
         self.assertIn("user", res)
         self.assertIn("device", res["user"])
         dev = res["user"]["device"]
-        self.assertDictContainsSubset({"keys": json, "device_display_name": None}, dev)
+        self.assertDictContainsSubset(json, dev)
 
     @defer.inlineCallbacks
     def test_reupload_key(self):
@@ -68,7 +68,7 @@ class EndToEndKeyStoreTestCase(tests.unittest.TestCase):
         self.assertIn("device", res["user"])
         dev = res["user"]["device"]
         self.assertDictContainsSubset(
-            {"keys": json, "device_display_name": "display_name"}, dev
+            {"key": "value", "unsigned": {"device_display_name": "display_name"}}, dev
         )
 
     @defer.inlineCallbacks
@@ -80,10 +80,10 @@ class EndToEndKeyStoreTestCase(tests.unittest.TestCase):
         yield self.store.store_device("user2", "device1", None)
         yield self.store.store_device("user2", "device2", None)
 
-        yield self.store.set_e2e_device_keys("user1", "device1", now, "json11")
-        yield self.store.set_e2e_device_keys("user1", "device2", now, "json12")
-        yield self.store.set_e2e_device_keys("user2", "device1", now, "json21")
-        yield self.store.set_e2e_device_keys("user2", "device2", now, "json22")
+        yield self.store.set_e2e_device_keys("user1", "device1", now, {"key": "json11"})
+        yield self.store.set_e2e_device_keys("user1", "device2", now, {"key": "json12"})
+        yield self.store.set_e2e_device_keys("user2", "device1", now, {"key": "json21"})
+        yield self.store.set_e2e_device_keys("user2", "device2", now, {"key": "json22"})
 
         res = yield self.store.get_e2e_device_keys(
             (("user1", "device1"), ("user2", "device2"))
diff --git a/tests/storage/test_event_federation.py b/tests/storage/test_event_federation.py
index b58386994e..2fe50377f8 100644
--- a/tests/storage/test_event_federation.py
+++ b/tests/storage/test_event_federation.py
@@ -57,7 +57,7 @@ class EventFederationWorkerStoreTestCase(tests.unittest.TestCase):
                     "(event_id, algorithm, hash) "
                     "VALUES (?, 'sha256', ?)"
                 ),
-                (event_id, b"ffff"),
+                (event_id, bytearray(b"ffff")),
             )
 
         for i in range(0, 11):
diff --git a/tests/storage/test_monthly_active_users.py b/tests/storage/test_monthly_active_users.py
index 1494650d10..90a63dc477 100644
--- a/tests/storage/test_monthly_active_users.py
+++ b/tests/storage/test_monthly_active_users.py
@@ -50,6 +50,7 @@ class MonthlyActiveUsersTestCase(unittest.HomeserverTestCase):
             {"medium": "email", "address": user2_email},
             {"medium": "email", "address": user3_email},
         ]
+        self.hs.config.mau_limits_reserved_threepids = threepids
         # -1 because user3 is a support user and does not count
         user_num = len(threepids) - 1
 
@@ -84,6 +85,7 @@ class MonthlyActiveUsersTestCase(unittest.HomeserverTestCase):
         self.hs.config.max_mau_value = 0
 
         self.reactor.advance(FORTY_DAYS)
+        self.hs.config.max_mau_value = 5
 
         self.store.reap_monthly_active_users()
         self.pump()
@@ -147,9 +149,7 @@ class MonthlyActiveUsersTestCase(unittest.HomeserverTestCase):
         self.store.reap_monthly_active_users()
         self.pump()
         count = self.store.get_monthly_active_count()
-        self.assertEquals(
-            self.get_success(count), initial_users - self.hs.config.max_mau_value
-        )
+        self.assertEquals(self.get_success(count), self.hs.config.max_mau_value)
 
         self.reactor.advance(FORTY_DAYS)
         self.store.reap_monthly_active_users()
@@ -158,6 +158,44 @@ class MonthlyActiveUsersTestCase(unittest.HomeserverTestCase):
         count = self.store.get_monthly_active_count()
         self.assertEquals(self.get_success(count), 0)
 
+    def test_reap_monthly_active_users_reserved_users(self):
+        """ Tests that reaping correctly handles reaping where reserved users are
+        present"""
+
+        self.hs.config.max_mau_value = 5
+        initial_users = 5
+        reserved_user_number = initial_users - 1
+        threepids = []
+        for i in range(initial_users):
+            user = "@user%d:server" % i
+            email = "user%d@example.com" % i
+            self.get_success(self.store.upsert_monthly_active_user(user))
+            threepids.append({"medium": "email", "address": email})
+            # Need to ensure that the most recent entries in the
+            # monthly_active_users table are reserved
+            now = int(self.hs.get_clock().time_msec())
+            if i != 0:
+                self.get_success(
+                    self.store.register_user(user_id=user, password_hash=None)
+                )
+                self.get_success(
+                    self.store.user_add_threepid(user, "email", email, now, now)
+                )
+
+        self.hs.config.mau_limits_reserved_threepids = threepids
+        self.store.runInteraction(
+            "initialise", self.store._initialise_reserved_users, threepids
+        )
+        count = self.store.get_monthly_active_count()
+        self.assertTrue(self.get_success(count), initial_users)
+
+        users = self.store.get_registered_reserved_users()
+        self.assertEquals(len(self.get_success(users)), reserved_user_number)
+
+        self.get_success(self.store.reap_monthly_active_users())
+        count = self.store.get_monthly_active_count()
+        self.assertEquals(self.get_success(count), self.hs.config.max_mau_value)
+
     def test_populate_monthly_users_is_guest(self):
         # Test that guest users are not added to mau list
         user_id = "@user_id:host"
@@ -192,12 +230,13 @@ class MonthlyActiveUsersTestCase(unittest.HomeserverTestCase):
 
     def test_get_reserved_real_user_account(self):
         # Test no reserved users, or reserved threepids
-        count = self.store.get_registered_reserved_users_count()
-        self.assertEquals(self.get_success(count), 0)
+        users = self.get_success(self.store.get_registered_reserved_users())
+        self.assertEquals(len(users), 0)
         # Test reserved users but no registered users
 
         user1 = "@user1:example.com"
         user2 = "@user2:example.com"
+
         user1_email = "user1@example.com"
         user2_email = "user2@example.com"
         threepids = [
@@ -210,8 +249,8 @@ class MonthlyActiveUsersTestCase(unittest.HomeserverTestCase):
         )
 
         self.pump()
-        count = self.store.get_registered_reserved_users_count()
-        self.assertEquals(self.get_success(count), 0)
+        users = self.get_success(self.store.get_registered_reserved_users())
+        self.assertEquals(len(users), 0)
 
         # Test reserved registed users
         self.store.register_user(user_id=user1, password_hash=None)
@@ -221,8 +260,9 @@ class MonthlyActiveUsersTestCase(unittest.HomeserverTestCase):
         now = int(self.hs.get_clock().time_msec())
         self.store.user_add_threepid(user1, "email", user1_email, now, now)
         self.store.user_add_threepid(user2, "email", user2_email, now, now)
-        count = self.store.get_registered_reserved_users_count()
-        self.assertEquals(self.get_success(count), len(threepids))
+
+        users = self.get_success(self.store.get_registered_reserved_users())
+        self.assertEquals(len(users), len(threepids))
 
     def test_support_user_not_add_to_mau_limits(self):
         support_user_id = "@support:test"
diff --git a/tox.ini b/tox.ini
index 1bce10a4ce..367cc2ccf2 100644
--- a/tox.ini
+++ b/tox.ini
@@ -163,10 +163,9 @@ deps =
     {[base]deps}
     mypy
     mypy-zope
-    typeshed
 env =
     MYPYPATH = stubs/
 extras = all
-commands = mypy --show-traceback \
+commands = mypy --show-traceback --check-untyped-defs --show-error-codes --follow-imports=normal \
             synapse/logging/ \
             synapse/config/