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-rw-r--r--.buildkite/pipeline.yml8
-rw-r--r--changelog.d/4699.bugfix1
-rw-r--r--changelog.d/4791.feature1
-rw-r--r--changelog.d/4796.feature1
-rw-r--r--changelog.d/4797.misc1
-rw-r--r--changelog.d/4798.misc1
-rw-r--r--changelog.d/4799.misc1
-rw-r--r--docs/.sample_config_header.yaml7
-rw-r--r--docs/sample_config.yaml1041
-rw-r--r--docs/workers.rst2
-rwxr-xr-xscripts-dev/generate_sample_config18
-rwxr-xr-xscripts/generate_config11
-rw-r--r--synapse/app/client_reader.py11
-rw-r--r--synapse/config/_base.py27
-rw-r--r--synapse/config/database.py3
-rw-r--r--synapse/config/logger.py4
-rw-r--r--synapse/config/server.py4
-rw-r--r--synapse/handlers/device.py342
-rw-r--r--synapse/handlers/federation.py46
-rw-r--r--synapse/handlers/receipts.py103
-rw-r--r--synapse/notifier.py65
-rw-r--r--synapse/replication/slave/storage/deviceinbox.py15
-rw-r--r--synapse/replication/slave/storage/devices.py45
-rw-r--r--synapse/replication/slave/storage/push_rule.py2
-rw-r--r--synapse/server.py7
-rw-r--r--synapse/storage/deviceinbox.py324
-rw-r--r--synapse/storage/devices.py675
-rw-r--r--synapse/storage/end_to_end_keys.py88
-rw-r--r--synapse/storage/event_federation.py22
-rw-r--r--synapse/storage/receipts.py26
-rw-r--r--synapse/visibility.py87
-rw-r--r--tox.ini3
32 files changed, 2078 insertions, 914 deletions
diff --git a/.buildkite/pipeline.yml b/.buildkite/pipeline.yml
index 24f22c85b4..369a1ffed1 100644
--- a/.buildkite/pipeline.yml
+++ b/.buildkite/pipeline.yml
@@ -40,6 +40,14 @@ steps:
 
   - command:
       - "python -m pip install tox"
+      - "tox -e check-sampleconfig"
+    label: "\U0001F9F9 check-sample-config"
+    plugins:
+      - docker#v3.0.1:
+          image: "python:3.6"
+
+  - command:
+      - "python -m pip install tox"
       - "tox -e py27,codecov"
     label: ":python: 2.7 / SQLite"
     env:
diff --git a/changelog.d/4699.bugfix b/changelog.d/4699.bugfix
new file mode 100644
index 0000000000..1d7f3174e7
--- /dev/null
+++ b/changelog.d/4699.bugfix
@@ -0,0 +1 @@
+Fix attempting to paginate in rooms where server cannot see any events, to avoid unnecessarily pulling in lots of redacted events.
diff --git a/changelog.d/4791.feature b/changelog.d/4791.feature
new file mode 100644
index 0000000000..1e5fd32463
--- /dev/null
+++ b/changelog.d/4791.feature
@@ -0,0 +1 @@
+Include a default configuration file in the 'docs' directory.
diff --git a/changelog.d/4796.feature b/changelog.d/4796.feature
new file mode 100644
index 0000000000..9e05560a3f
--- /dev/null
+++ b/changelog.d/4796.feature
@@ -0,0 +1 @@
+Add support for /keys/query and /keys/changes REST endpoints to client_reader worker.
diff --git a/changelog.d/4797.misc b/changelog.d/4797.misc
new file mode 100644
index 0000000000..822e98e6a7
--- /dev/null
+++ b/changelog.d/4797.misc
@@ -0,0 +1 @@
+Clean up read-receipt handling.
diff --git a/changelog.d/4798.misc b/changelog.d/4798.misc
new file mode 100644
index 0000000000..d60f208dc3
--- /dev/null
+++ b/changelog.d/4798.misc
@@ -0,0 +1 @@
+Add some debug about processing read receipts.
diff --git a/changelog.d/4799.misc b/changelog.d/4799.misc
new file mode 100644
index 0000000000..5ab11a5c0b
--- /dev/null
+++ b/changelog.d/4799.misc
@@ -0,0 +1 @@
+Clean up some replication code.
diff --git a/docs/.sample_config_header.yaml b/docs/.sample_config_header.yaml
new file mode 100644
index 0000000000..576fc98609
--- /dev/null
+++ b/docs/.sample_config_header.yaml
@@ -0,0 +1,7 @@
+# This file is a reference to the configuration options which can be set in
+# homeserver.yaml.
+#
+# Note that it is not quite ready to be used as-is. If you are starting from
+# scratch, it is easier to generate the config files following the instructions
+# in INSTALL.md.
+
diff --git a/docs/sample_config.yaml b/docs/sample_config.yaml
new file mode 100644
index 0000000000..7cf58d2182
--- /dev/null
+++ b/docs/sample_config.yaml
@@ -0,0 +1,1041 @@
+# This file is a reference to the configuration options which can be set in
+# homeserver.yaml.
+#
+# Note that it is not quite ready to be used as-is. If you are starting from
+# scratch, it is easier to generate the config files following the instructions
+# in INSTALL.md.
+
+## Server ##
+
+# The domain name of the server, with optional explicit port.
+# This is used by remote servers to connect to this server,
+# e.g. matrix.org, localhost:8080, etc.
+# This is also the last part of your UserID.
+#
+server_name: "SERVERNAME"
+
+# When running as a daemon, the file to store the pid in
+#
+pid_file: DATADIR/homeserver.pid
+
+# CPU affinity mask. Setting this restricts the CPUs on which the
+# process will be scheduled. It is represented as a bitmask, with the
+# lowest order bit corresponding to the first logical CPU and the
+# highest order bit corresponding to the last logical CPU. Not all CPUs
+# may exist on a given system but a mask may specify more CPUs than are
+# present.
+#
+# For example:
+#    0x00000001  is processor #0,
+#    0x00000003  is processors #0 and #1,
+#    0xFFFFFFFF  is all processors (#0 through #31).
+#
+# Pinning a Python process to a single CPU is desirable, because Python
+# is inherently single-threaded due to the GIL, and can suffer a
+# 30-40% slowdown due to cache blow-out and thread context switching
+# if the scheduler happens to schedule the underlying threads across
+# different cores. See
+# https://www.mirantis.com/blog/improve-performance-python-programs-restricting-single-cpu/.
+#
+# This setting requires the affinity package to be installed!
+#
+#cpu_affinity: 0xFFFFFFFF
+
+# The path to the web client which will be served at /_matrix/client/
+# if 'webclient' is configured under the 'listeners' configuration.
+#
+#web_client_location: "/path/to/web/root"
+
+# The public-facing base URL that clients use to access this HS
+# (not including _matrix/...). This is the same URL a user would
+# enter into the 'custom HS URL' field on their client. If you
+# use synapse with a reverse proxy, this should be the URL to reach
+# synapse via the proxy.
+#
+#public_baseurl: https://example.com/
+
+# Set the soft limit on the number of file descriptors synapse can use
+# Zero is used to indicate synapse should set the soft limit to the
+# hard limit.
+#
+soft_file_limit: 0
+
+# Set to false to disable presence tracking on this homeserver.
+#
+use_presence: true
+
+# The GC threshold parameters to pass to `gc.set_threshold`, if defined
+#
+#gc_thresholds: [700, 10, 10]
+
+# Set the limit on the returned events in the timeline in the get
+# and sync operations. The default value is -1, means no upper limit.
+#
+#filter_timeline_limit: 5000
+
+# Whether room invites to users on this server should be blocked
+# (except those sent by local server admins). The default is False.
+#
+#block_non_admin_invites: True
+
+# Room searching
+#
+# If disabled, new messages will not be indexed for searching and users
+# will receive errors when searching for messages. Defaults to enabled.
+#
+#enable_search: false
+
+# Restrict federation to the following whitelist of domains.
+# N.B. we recommend also firewalling your federation listener to limit
+# inbound federation traffic as early as possible, rather than relying
+# purely on this application-layer restriction.  If not specified, the
+# default is to whitelist everything.
+#
+#federation_domain_whitelist:
+#  - lon.example.com
+#  - nyc.example.com
+#  - syd.example.com
+
+# List of ports that Synapse should listen on, their purpose and their
+# configuration.
+#
+# Options for each listener include:
+#
+#   port: the TCP port to bind to
+#
+#   bind_addresses: a list of local addresses to listen on. The default is
+#       'all local interfaces'.
+#
+#   type: the type of listener. Normally 'http', but other valid options are:
+#       'manhole' (see docs/manhole.md),
+#       'metrics' (see docs/metrics-howto.rst),
+#       'replication' (see docs/workers.rst).
+#
+#   tls: set to true to enable TLS for this listener. Will use the TLS
+#       key/cert specified in tls_private_key_path / tls_certificate_path.
+#
+#   x_forwarded: Only valid for an 'http' listener. Set to true to use the
+#       X-Forwarded-For header as the client IP. Useful when Synapse is
+#       behind a reverse-proxy.
+#
+#   resources: Only valid for an 'http' listener. A list of resources to host
+#       on this port. Options for each resource are:
+#
+#       names: a list of names of HTTP resources. See below for a list of
+#           valid resource names.
+#
+#       compress: set to true to enable HTTP comression for this resource.
+#
+#   additional_resources: Only valid for an 'http' listener. A map of
+#        additional endpoints which should be loaded via dynamic modules.
+#
+# Valid resource names are:
+#
+#   client: the client-server API (/_matrix/client). Also implies 'media' and
+#       'static'.
+#
+#   consent: user consent forms (/_matrix/consent). See
+#       docs/consent_tracking.md.
+#
+#   federation: the server-server API (/_matrix/federation). Also implies
+#       'media', 'keys', 'openid'
+#
+#   keys: the key discovery API (/_matrix/keys).
+#
+#   media: the media API (/_matrix/media).
+#
+#   metrics: the metrics interface. See docs/metrics-howto.rst.
+#
+#   openid: OpenID authentication.
+#
+#   replication: the HTTP replication API (/_synapse/replication). See
+#       docs/workers.rst.
+#
+#   static: static resources under synapse/static (/_matrix/static). (Mostly
+#       useful for 'fallback authentication'.)
+#
+#   webclient: A web client. Requires web_client_location to be set.
+#
+listeners:
+  # TLS-enabled listener: for when matrix traffic is sent directly to synapse.
+  #
+  # Disabled by default. To enable it, uncomment the following. (Note that you
+  # will also need to give Synapse a TLS key and certificate: see the TLS section
+  # below.)
+  #
+  #- port: 8448
+  #  type: http
+  #  tls: true
+  #  resources:
+  #    - names: [client, federation]
+
+  # Unsecure HTTP listener: for when matrix traffic passes through a reverse proxy
+  # that unwraps TLS.
+  #
+  # If you plan to use a reverse proxy, please see
+  # https://github.com/matrix-org/synapse/blob/master/docs/reverse_proxy.rst.
+  #
+  - port: 8008
+    tls: false
+    bind_addresses: ['::1', '127.0.0.1']
+    type: http
+    x_forwarded: true
+
+    resources:
+      - names: [client, federation]
+        compress: false
+
+    # example additonal_resources:
+    #
+    #additional_resources:
+    #  "/_matrix/my/custom/endpoint":
+    #    module: my_module.CustomRequestHandler
+    #    config: {}
+
+  # Turn on the twisted ssh manhole service on localhost on the given
+  # port.
+  #
+  #- port: 9000
+  #  bind_addresses: ['::1', '127.0.0.1']
+  #  type: manhole
+
+
+## Homeserver blocking ##
+
+# How to reach the server admin, used in ResourceLimitError
+#
+#admin_contact: 'mailto:admin@server.com'
+
+# Global blocking
+#
+#hs_disabled: False
+#hs_disabled_message: 'Human readable reason for why the HS is blocked'
+#hs_disabled_limit_type: 'error code(str), to help clients decode reason'
+
+# Monthly Active User Blocking
+#
+#limit_usage_by_mau: False
+#max_mau_value: 50
+#mau_trial_days: 2
+
+# If enabled, the metrics for the number of monthly active users will
+# be populated, however no one will be limited. If limit_usage_by_mau
+# is true, this is implied to be true.
+#
+#mau_stats_only: False
+
+# Sometimes the server admin will want to ensure certain accounts are
+# never blocked by mau checking. These accounts are specified here.
+#
+#mau_limit_reserved_threepids:
+#  - medium: 'email'
+#    address: 'reserved_user@example.com'
+
+
+## TLS ##
+
+# PEM-encoded X509 certificate for TLS.
+# This certificate, as of Synapse 1.0, will need to be a valid and verifiable
+# certificate, signed by a recognised Certificate Authority.
+#
+# See 'ACME support' below to enable auto-provisioning this certificate via
+# Let's Encrypt.
+#
+#tls_certificate_path: "CONFDIR/SERVERNAME.tls.crt"
+
+# PEM-encoded private key for TLS
+#
+#tls_private_key_path: "CONFDIR/SERVERNAME.tls.key"
+
+# ACME support: This will configure Synapse to request a valid TLS certificate
+# for your configured `server_name` via Let's Encrypt.
+#
+# Note that provisioning a certificate in this way requires port 80 to be
+# routed to Synapse so that it can complete the http-01 ACME challenge.
+# By default, if you enable ACME support, Synapse will attempt to listen on
+# port 80 for incoming http-01 challenges - however, this will likely fail
+# with 'Permission denied' or a similar error.
+#
+# There are a couple of potential solutions to this:
+#
+#  * If you already have an Apache, Nginx, or similar listening on port 80,
+#    you can configure Synapse to use an alternate port, and have your web
+#    server forward the requests. For example, assuming you set 'port: 8009'
+#    below, on Apache, you would write:
+#
+#    ProxyPass /.well-known/acme-challenge http://localhost:8009/.well-known/acme-challenge
+#
+#  * Alternatively, you can use something like `authbind` to give Synapse
+#    permission to listen on port 80.
+#
+acme:
+    # ACME support is disabled by default. Uncomment the following line
+    # (and tls_certificate_path and tls_private_key_path above) to enable it.
+    #
+    #enabled: true
+
+    # Endpoint to use to request certificates. If you only want to test,
+    # use Let's Encrypt's staging url:
+    #     https://acme-staging.api.letsencrypt.org/directory
+    #
+    #url: https://acme-v01.api.letsencrypt.org/directory
+
+    # Port number to listen on for the HTTP-01 challenge. Change this if
+    # you are forwarding connections through Apache/Nginx/etc.
+    #
+    #port: 80
+
+    # Local addresses to listen on for incoming connections.
+    # Again, you may want to change this if you are forwarding connections
+    # through Apache/Nginx/etc.
+    #
+    #bind_addresses: ['::', '0.0.0.0']
+
+    # How many days remaining on a certificate before it is renewed.
+    #
+    #reprovision_threshold: 30
+
+    # The domain that the certificate should be for. Normally this
+    # should be the same as your Matrix domain (i.e., 'server_name'), but,
+    # by putting a file at 'https://<server_name>/.well-known/matrix/server',
+    # you can delegate incoming traffic to another server. If you do that,
+    # you should give the target of the delegation here.
+    #
+    # For example: if your 'server_name' is 'example.com', but
+    # 'https://example.com/.well-known/matrix/server' delegates to
+    # 'matrix.example.com', you should put 'matrix.example.com' here.
+    #
+    # If not set, defaults to your 'server_name'.
+    #
+    #domain: matrix.example.com
+
+# List of allowed TLS fingerprints for this server to publish along
+# with the signing keys for this server. Other matrix servers that
+# make HTTPS requests to this server will check that the TLS
+# certificates returned by this server match one of the fingerprints.
+#
+# Synapse automatically adds the fingerprint of its own certificate
+# to the list. So if federation traffic is handled directly by synapse
+# then no modification to the list is required.
+#
+# If synapse is run behind a load balancer that handles the TLS then it
+# will be necessary to add the fingerprints of the certificates used by
+# the loadbalancers to this list if they are different to the one
+# synapse is using.
+#
+# Homeservers are permitted to cache the list of TLS fingerprints
+# returned in the key responses up to the "valid_until_ts" returned in
+# key. It may be necessary to publish the fingerprints of a new
+# certificate and wait until the "valid_until_ts" of the previous key
+# responses have passed before deploying it.
+#
+# You can calculate a fingerprint from a given TLS listener via:
+# openssl s_client -connect $host:$port < /dev/null 2> /dev/null |
+#   openssl x509 -outform DER | openssl sha256 -binary | base64 | tr -d '='
+# or by checking matrix.org/federationtester/api/report?server_name=$host
+#
+#tls_fingerprints: [{"sha256": "<base64_encoded_sha256_fingerprint>"}]
+
+
+
+## Database ##
+
+database:
+  # The database engine name
+  name: "sqlite3"
+  # Arguments to pass to the engine
+  args:
+    # Path to the database
+    database: "DATADIR/homeserver.db"
+
+# Number of events to cache in memory.
+event_cache_size: "10K"
+
+
+## Logging ##
+
+# A yaml python logging config file
+#
+log_config: "CONFDIR/SERVERNAME.log.config"
+
+
+## Ratelimiting ##
+
+# Number of messages a client can send per second
+#
+rc_messages_per_second: 0.2
+
+# Number of message a client can send before being throttled
+#
+rc_message_burst_count: 10.0
+
+# The federation window size in milliseconds
+#
+federation_rc_window_size: 1000
+
+# The number of federation requests from a single server in a window
+# before the server will delay processing the request.
+#
+federation_rc_sleep_limit: 10
+
+# The duration in milliseconds to delay processing events from
+# remote servers by if they go over the sleep limit.
+#
+federation_rc_sleep_delay: 500
+
+# The maximum number of concurrent federation requests allowed
+# from a single server
+#
+federation_rc_reject_limit: 50
+
+# The number of federation requests to concurrently process from a
+# single server
+#
+federation_rc_concurrent: 3
+
+
+
+# Directory where uploaded images and attachments are stored.
+#
+media_store_path: "DATADIR/media_store"
+
+# Media storage providers allow media to be stored in different
+# locations.
+#
+#media_storage_providers:
+#  - module: file_system
+#    # Whether to write new local files.
+#    store_local: false
+#    # Whether to write new remote media
+#    store_remote: false
+#    # Whether to block upload requests waiting for write to this
+#    # provider to complete
+#    store_synchronous: false
+#    config:
+#       directory: /mnt/some/other/directory
+
+# Directory where in-progress uploads are stored.
+#
+uploads_path: "DATADIR/uploads"
+
+# The largest allowed upload size in bytes
+#
+max_upload_size: "10M"
+
+# Maximum number of pixels that will be thumbnailed
+#
+max_image_pixels: "32M"
+
+# Whether to generate new thumbnails on the fly to precisely match
+# the resolution requested by the client. If true then whenever
+# a new resolution is requested by the client the server will
+# generate a new thumbnail. If false the server will pick a thumbnail
+# from a precalculated list.
+#
+dynamic_thumbnails: false
+
+# List of thumbnails to precalculate when an image is uploaded.
+#
+thumbnail_sizes:
+- width: 32
+  height: 32
+  method: crop
+- width: 96
+  height: 96
+  method: crop
+- width: 320
+  height: 240
+  method: scale
+- width: 640
+  height: 480
+  method: scale
+- width: 800
+  height: 600
+  method: scale
+
+# Is the preview URL API enabled?  If enabled, you *must* specify
+# an explicit url_preview_ip_range_blacklist of IPs that the spider is
+# denied from accessing.
+#
+url_preview_enabled: False
+
+# List of IP address CIDR ranges that the URL preview spider is denied
+# from accessing.  There are no defaults: you must explicitly
+# specify a list for URL previewing to work.  You should specify any
+# internal services in your network that you do not want synapse to try
+# to connect to, otherwise anyone in any Matrix room could cause your
+# synapse to issue arbitrary GET requests to your internal services,
+# causing serious security issues.
+#
+#url_preview_ip_range_blacklist:
+#  - '127.0.0.0/8'
+#  - '10.0.0.0/8'
+#  - '172.16.0.0/12'
+#  - '192.168.0.0/16'
+#  - '100.64.0.0/10'
+#  - '169.254.0.0/16'
+#  - '::1/128'
+#  - 'fe80::/64'
+#  - 'fc00::/7'
+#
+# List of IP address CIDR ranges that the URL preview spider is allowed
+# to access even if they are specified in url_preview_ip_range_blacklist.
+# This is useful for specifying exceptions to wide-ranging blacklisted
+# target IP ranges - e.g. for enabling URL previews for a specific private
+# website only visible in your network.
+#
+#url_preview_ip_range_whitelist:
+#   - '192.168.1.1'
+
+# Optional list of URL matches that the URL preview spider is
+# denied from accessing.  You should use url_preview_ip_range_blacklist
+# in preference to this, otherwise someone could define a public DNS
+# entry that points to a private IP address and circumvent the blacklist.
+# This is more useful if you know there is an entire shape of URL that
+# you know that will never want synapse to try to spider.
+#
+# Each list entry is a dictionary of url component attributes as returned
+# by urlparse.urlsplit as applied to the absolute form of the URL.  See
+# https://docs.python.org/2/library/urlparse.html#urlparse.urlsplit
+# The values of the dictionary are treated as an filename match pattern
+# applied to that component of URLs, unless they start with a ^ in which
+# case they are treated as a regular expression match.  If all the
+# specified component matches for a given list item succeed, the URL is
+# blacklisted.
+#
+#url_preview_url_blacklist:
+#  # blacklist any URL with a username in its URI
+#  - username: '*'
+#
+#  # blacklist all *.google.com URLs
+#  - netloc: 'google.com'
+#  - netloc: '*.google.com'
+#
+#  # blacklist all plain HTTP URLs
+#  - scheme: 'http'
+#
+#  # blacklist http(s)://www.acme.com/foo
+#  - netloc: 'www.acme.com'
+#    path: '/foo'
+#
+#  # blacklist any URL with a literal IPv4 address
+#  - netloc: '^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+$'
+
+# The largest allowed URL preview spidering size in bytes
+max_spider_size: "10M"
+
+
+
+## Captcha ##
+# See docs/CAPTCHA_SETUP for full details of configuring this.
+
+# This Home Server's ReCAPTCHA public key.
+#
+recaptcha_public_key: "YOUR_PUBLIC_KEY"
+
+# This Home Server's ReCAPTCHA private key.
+#
+recaptcha_private_key: "YOUR_PRIVATE_KEY"
+
+# Enables ReCaptcha checks when registering, preventing signup
+# unless a captcha is answered. Requires a valid ReCaptcha
+# public/private key.
+#
+enable_registration_captcha: False
+
+# A secret key used to bypass the captcha test entirely.
+#captcha_bypass_secret: "YOUR_SECRET_HERE"
+
+# The API endpoint to use for verifying m.login.recaptcha responses.
+recaptcha_siteverify_api: "https://www.recaptcha.net/recaptcha/api/siteverify"
+
+
+## TURN ##
+
+# The public URIs of the TURN server to give to clients
+#
+#turn_uris: []
+
+# The shared secret used to compute passwords for the TURN server
+#
+#turn_shared_secret: "YOUR_SHARED_SECRET"
+
+# The Username and password if the TURN server needs them and
+# does not use a token
+#
+#turn_username: "TURNSERVER_USERNAME"
+#turn_password: "TURNSERVER_PASSWORD"
+
+# How long generated TURN credentials last
+#
+turn_user_lifetime: "1h"
+
+# Whether guests should be allowed to use the TURN server.
+# This defaults to True, otherwise VoIP will be unreliable for guests.
+# However, it does introduce a slight security risk as it allows users to
+# connect to arbitrary endpoints without having first signed up for a
+# valid account (e.g. by passing a CAPTCHA).
+#
+turn_allow_guests: True
+
+
+## Registration ##
+
+# Enable registration for new users.
+enable_registration: False
+
+# The user must provide all of the below types of 3PID when registering.
+#
+#registrations_require_3pid:
+#  - email
+#  - msisdn
+
+# Explicitly disable asking for MSISDNs from the registration
+# flow (overrides registrations_require_3pid if MSISDNs are set as required)
+#
+#disable_msisdn_registration: True
+
+# Mandate that users are only allowed to associate certain formats of
+# 3PIDs with accounts on this server.
+#
+#allowed_local_3pids:
+#  - medium: email
+#    pattern: '.*@matrix\.org'
+#  - medium: email
+#    pattern: '.*@vector\.im'
+#  - medium: msisdn
+#    pattern: '\+44'
+
+# If set, allows registration by anyone who also has the shared
+# secret, even if registration is otherwise disabled.
+#
+# registration_shared_secret: <PRIVATE STRING>
+
+# Set the number of bcrypt rounds used to generate password hash.
+# Larger numbers increase the work factor needed to generate the hash.
+# The default number is 12 (which equates to 2^12 rounds).
+# N.B. that increasing this will exponentially increase the time required
+# to register or login - e.g. 24 => 2^24 rounds which will take >20 mins.
+#
+bcrypt_rounds: 12
+
+# Allows users to register as guests without a password/email/etc, and
+# participate in rooms hosted on this server which have been made
+# accessible to anonymous users.
+#
+allow_guest_access: False
+
+# The identity server which we suggest that clients should use when users log
+# in on this server.
+#
+# (By default, no suggestion is made, so it is left up to the client.
+# This setting is ignored unless public_baseurl is also set.)
+#
+#default_identity_server: https://matrix.org
+
+# The list of identity servers trusted to verify third party
+# identifiers by this server.
+#
+# Also defines the ID server which will be called when an account is
+# deactivated (one will be picked arbitrarily).
+#
+trusted_third_party_id_servers:
+  - matrix.org
+  - vector.im
+
+# Users who register on this homeserver will automatically be joined
+# to these rooms
+#
+#auto_join_rooms:
+#  - "#example:example.com"
+
+# Where auto_join_rooms are specified, setting this flag ensures that the
+# the rooms exist by creating them when the first user on the
+# homeserver registers.
+# Setting to false means that if the rooms are not manually created,
+# users cannot be auto-joined since they do not exist.
+#
+autocreate_auto_join_rooms: true
+
+
+## Metrics ###
+
+# Enable collection and rendering of performance metrics
+#
+enable_metrics: False
+
+# Enable sentry integration
+# NOTE: While attempts are made to ensure that the logs don't contain
+# any sensitive information, this cannot be guaranteed. By enabling
+# this option the sentry server may therefore receive sensitive
+# information, and it in turn may then diseminate sensitive information
+# through insecure notification channels if so configured.
+#
+#sentry:
+#    dsn: "..."
+
+# Whether or not to report anonymized homeserver usage statistics.
+# report_stats: true|false
+
+
+## API Configuration ##
+
+# A list of event types that will be included in the room_invite_state
+#
+room_invite_state_types:
+    - "m.room.join_rules"
+    - "m.room.canonical_alias"
+    - "m.room.avatar"
+    - "m.room.encryption"
+    - "m.room.name"
+
+
+# A list of application service config file to use
+#
+app_service_config_files: []
+
+# Whether or not to track application service IP addresses. Implicitly
+# enables MAU tracking for application service users.
+#
+track_appservice_user_ips: False
+
+
+# a secret which is used to sign access tokens. If none is specified,
+# the registration_shared_secret is used, if one is given; otherwise,
+# a secret key is derived from the signing key.
+#
+# macaroon_secret_key: <PRIVATE STRING>
+
+# Used to enable access token expiration.
+#
+expire_access_token: False
+
+# a secret which is used to calculate HMACs for form values, to stop
+# falsification of values. Must be specified for the User Consent
+# forms to work.
+#
+# form_secret: <PRIVATE STRING>
+
+## Signing Keys ##
+
+# Path to the signing key to sign messages with
+#
+signing_key_path: "CONFDIR/SERVERNAME.signing.key"
+
+# The keys that the server used to sign messages with but won't use
+# to sign new messages. E.g. it has lost its private key
+#
+#old_signing_keys:
+#  "ed25519:auto":
+#    # Base64 encoded public key
+#    key: "The public part of your old signing key."
+#    # Millisecond POSIX timestamp when the key expired.
+#    expired_ts: 123456789123
+
+# How long key response published by this server is valid for.
+# Used to set the valid_until_ts in /key/v2 APIs.
+# Determines how quickly servers will query to check which keys
+# are still valid.
+#
+key_refresh_interval: "1d" # 1 Day.
+
+# The trusted servers to download signing keys from.
+#
+perspectives:
+  servers:
+    "matrix.org":
+      verify_keys:
+        "ed25519:auto":
+          key: "Noi6WqcDj0QmPxCNQqgezwTlBKrfqehY1u2FyWP9uYw"
+
+
+
+# Enable SAML2 for registration and login. Uses pysaml2.
+#
+# `sp_config` is the configuration for the pysaml2 Service Provider.
+# See pysaml2 docs for format of config.
+#
+# Default values will be used for the 'entityid' and 'service' settings,
+# so it is not normally necessary to specify them unless you need to
+# override them.
+#
+#saml2_config:
+#  sp_config:
+#    # point this to the IdP's metadata. You can use either a local file or
+#    # (preferably) a URL.
+#    metadata:
+#      #local: ["saml2/idp.xml"]
+#      remote:
+#        - url: https://our_idp/metadata.xml
+#
+#    # The rest of sp_config is just used to generate our metadata xml, and you
+#    # may well not need it, depending on your setup. Alternatively you
+#    # may need a whole lot more detail - see the pysaml2 docs!
+#
+#    description: ["My awesome SP", "en"]
+#    name: ["Test SP", "en"]
+#
+#    organization:
+#      name: Example com
+#      display_name:
+#        - ["Example co", "en"]
+#      url: "http://example.com"
+#
+#    contact_person:
+#      - given_name: Bob
+#        sur_name: "the Sysadmin"
+#        email_address": ["admin@example.com"]
+#        contact_type": technical
+#
+#  # Instead of putting the config inline as above, you can specify a
+#  # separate pysaml2 configuration file:
+#  #
+#  config_path: "CONFDIR/sp_conf.py"
+
+
+
+# Enable CAS for registration and login.
+#
+#cas_config:
+#   enabled: true
+#   server_url: "https://cas-server.com"
+#   service_url: "https://homeserver.domain.com:8448"
+#   #required_attributes:
+#   #    name: value
+
+
+# The JWT needs to contain a globally unique "sub" (subject) claim.
+#
+#jwt_config:
+#   enabled: true
+#   secret: "a secret"
+#   algorithm: "HS256"
+
+
+
+# Enable password for login.
+#
+password_config:
+   enabled: true
+   # Uncomment and change to a secret random string for extra security.
+   # DO NOT CHANGE THIS AFTER INITIAL SETUP!
+   #pepper: ""
+
+
+
+# Enable sending emails for notification events
+# Defining a custom URL for Riot is only needed if email notifications
+# should contain links to a self-hosted installation of Riot; when set
+# the "app_name" setting is ignored.
+#
+# If your SMTP server requires authentication, the optional smtp_user &
+# smtp_pass variables should be used
+#
+#email:
+#   enable_notifs: false
+#   smtp_host: "localhost"
+#   smtp_port: 25
+#   smtp_user: "exampleusername"
+#   smtp_pass: "examplepassword"
+#   require_transport_security: False
+#   notif_from: "Your Friendly %(app)s Home Server <noreply@example.com>"
+#   app_name: Matrix
+#   # if template_dir is unset, uses the example templates that are part of
+#   # the Synapse distribution.
+#   #template_dir: res/templates
+#   notif_template_html: notif_mail.html
+#   notif_template_text: notif_mail.txt
+#   notif_for_new_users: True
+#   riot_base_url: "http://localhost/riot"
+
+
+#password_providers:
+#    - module: "ldap_auth_provider.LdapAuthProvider"
+#      config:
+#        enabled: true
+#        uri: "ldap://ldap.example.com:389"
+#        start_tls: true
+#        base: "ou=users,dc=example,dc=com"
+#        attributes:
+#           uid: "cn"
+#           mail: "email"
+#           name: "givenName"
+#        #bind_dn:
+#        #bind_password:
+#        #filter: "(objectClass=posixAccount)"
+
+
+
+# Clients requesting push notifications can either have the body of
+# the message sent in the notification poke along with other details
+# like the sender, or just the event ID and room ID (`event_id_only`).
+# If clients choose the former, this option controls whether the
+# notification request includes the content of the event (other details
+# like the sender are still included). For `event_id_only` push, it
+# has no effect.
+#
+# For modern android devices the notification content will still appear
+# because it is loaded by the app. iPhone, however will send a
+# notification saying only that a message arrived and who it came from.
+#
+#push:
+#  include_content: true
+
+
+#spam_checker:
+#  module: "my_custom_project.SuperSpamChecker"
+#  config:
+#    example_option: 'things'
+
+
+# Whether to allow non server admins to create groups on this server
+#
+enable_group_creation: false
+
+# If enabled, non server admins can only create groups with local parts
+# starting with this prefix
+#
+#group_creation_prefix: "unofficial/"
+
+
+
+# User Directory configuration
+#
+# 'search_all_users' defines whether to search all users visible to your HS
+# when searching the user directory, rather than limiting to users visible
+# in public rooms.  Defaults to false.  If you set it True, you'll have to run
+# UPDATE user_directory_stream_pos SET stream_id = NULL;
+# on your database to tell it to rebuild the user_directory search indexes.
+#
+#user_directory:
+#  search_all_users: false
+
+
+# User Consent configuration
+#
+# for detailed instructions, see
+# https://github.com/matrix-org/synapse/blob/master/docs/consent_tracking.md
+#
+# Parts of this section are required if enabling the 'consent' resource under
+# 'listeners', in particular 'template_dir' and 'version'.
+#
+# 'template_dir' gives the location of the templates for the HTML forms.
+# This directory should contain one subdirectory per language (eg, 'en', 'fr'),
+# and each language directory should contain the policy document (named as
+# '<version>.html') and a success page (success.html).
+#
+# 'version' specifies the 'current' version of the policy document. It defines
+# the version to be served by the consent resource if there is no 'v'
+# parameter.
+#
+# 'server_notice_content', if enabled, will send a user a "Server Notice"
+# asking them to consent to the privacy policy. The 'server_notices' section
+# must also be configured for this to work. Notices will *not* be sent to
+# guest users unless 'send_server_notice_to_guests' is set to true.
+#
+# 'block_events_error', if set, will block any attempts to send events
+# until the user consents to the privacy policy. The value of the setting is
+# used as the text of the error.
+#
+# 'require_at_registration', if enabled, will add a step to the registration
+# process, similar to how captcha works. Users will be required to accept the
+# policy before their account is created.
+#
+# 'policy_name' is the display name of the policy users will see when registering
+# for an account. Has no effect unless `require_at_registration` is enabled.
+# Defaults to "Privacy Policy".
+#
+#user_consent:
+#  template_dir: res/templates/privacy
+#  version: 1.0
+#  server_notice_content:
+#    msgtype: m.text
+#    body: >-
+#      To continue using this homeserver you must review and agree to the
+#      terms and conditions at %(consent_uri)s
+#  send_server_notice_to_guests: True
+#  block_events_error: >-
+#    To continue using this homeserver you must review and agree to the
+#    terms and conditions at %(consent_uri)s
+#  require_at_registration: False
+#  policy_name: Privacy Policy
+#
+
+
+# Server Notices room configuration
+#
+# Uncomment this section to enable a room which can be used to send notices
+# from the server to users. It is a special room which cannot be left; notices
+# come from a special "notices" user id.
+#
+# If you uncomment this section, you *must* define the system_mxid_localpart
+# setting, which defines the id of the user which will be used to send the
+# notices.
+#
+# It's also possible to override the room name, the display name of the
+# "notices" user, and the avatar for the user.
+#
+#server_notices:
+#  system_mxid_localpart: notices
+#  system_mxid_display_name: "Server Notices"
+#  system_mxid_avatar_url: "mxc://server.com/oumMVlgDnLYFaPVkExemNVVZ"
+#  room_name: "Server Notices"
+
+
+
+# The `alias_creation` option controls who's allowed to create aliases
+# on this server.
+#
+# The format of this option is a list of rules that contain globs that
+# match against user_id, room_id and the new alias (fully qualified with
+# server name). The action in the first rule that matches is taken,
+# which can currently either be "allow" or "deny".
+#
+# Missing user_id/room_id/alias fields default to "*".
+#
+# If no rules match the request is denied. An empty list means no one
+# can create aliases.
+#
+# Options for the rules include:
+#
+#   user_id: Matches against the creator of the alias
+#   alias: Matches against the alias being created
+#   room_id: Matches against the room ID the alias is being pointed at
+#   action: Whether to "allow" or "deny" the request if the rule matches
+#
+# The default is:
+#
+#alias_creation_rules:
+#  - user_id: "*"
+#    alias: "*"
+#    room_id: "*"
+#    action: allow
+
+# The `room_list_publication_rules` option controls who can publish and
+# which rooms can be published in the public room list.
+#
+# The format of this option is the same as that for
+# `alias_creation_rules`.
+#
+# If the room has one or more aliases associated with it, only one of
+# the aliases needs to match the alias rule. If there are no aliases
+# then only rules with `alias: *` match.
+#
+# If no rules match the request is denied. An empty list means no one
+# can publish rooms.
+#
+# Options for the rules include:
+#
+#   user_id: Matches agaisnt the creator of the alias
+#   room_id: Matches against the room ID being published
+#   alias: Matches against any current local or canonical aliases
+#            associated with the room
+#   action: Whether to "allow" or "deny" the request if the rule matches
+#
+# The default is:
+#
+#room_list_publication_rules:
+#  - user_id: "*"
+#    alias: "*"
+#    room_id: "*"
+#    action: allow
diff --git a/docs/workers.rst b/docs/workers.rst
index 3c18db1b19..d80fc04d2e 100644
--- a/docs/workers.rst
+++ b/docs/workers.rst
@@ -225,6 +225,8 @@ following regular expressions::
     ^/_matrix/client/(api/v1|r0|unstable)/rooms/.*/state$
     ^/_matrix/client/(api/v1|r0|unstable)/login$
     ^/_matrix/client/(api/v1|r0|unstable)/account/3pid$
+    ^/_matrix/client/(api/v1|r0|unstable)/keys/query$
+    ^/_matrix/client/(api/v1|r0|unstable)/keys/changes$
 
 Additionally, the following REST endpoints can be handled, but all requests must
 be routed to the same instance::
diff --git a/scripts-dev/generate_sample_config b/scripts-dev/generate_sample_config
new file mode 100755
index 0000000000..5e33b9b549
--- /dev/null
+++ b/scripts-dev/generate_sample_config
@@ -0,0 +1,18 @@
+#!/bin/bash
+#
+# Update/check the docs/sample_config.yaml
+
+set -e
+
+cd `dirname $0`/..
+
+SAMPLE_CONFIG="docs/sample_config.yaml"
+
+if [ "$1" == "--check" ]; then
+    diff -u "$SAMPLE_CONFIG" <(./scripts/generate_config --header-file docs/.sample_config_header.yaml) >/dev/null || {
+        echo -e "\e[1m\e[31m$SAMPLE_CONFIG is not up-to-date. Regenerate it with \`scripts-dev/generate_sample_config\`.\e[0m" >&2
+        exit 1
+    }
+else
+    ./scripts/generate_config --header-file docs/.sample_config_header.yaml -o "$SAMPLE_CONFIG"
+fi
diff --git a/scripts/generate_config b/scripts/generate_config
index 61c5f049e8..93b6406992 100755
--- a/scripts/generate_config
+++ b/scripts/generate_config
@@ -1,6 +1,7 @@
 #!/usr/bin/env python
 
 import argparse
+import shutil
 import sys
 
 from synapse.config.homeserver import HomeServerConfig
@@ -50,6 +51,13 @@ if __name__ == "__main__":
         help="File to write the configuration to. Default: stdout",
     )
 
+    parser.add_argument(
+        "--header-file",
+        type=argparse.FileType('r'),
+        help="File from which to read a header, which will be printed before the "
+             "generated config.",
+    )
+
     args = parser.parse_args()
 
     report_stats = args.report_stats
@@ -64,4 +72,7 @@ if __name__ == "__main__":
         report_stats=report_stats,
     )
 
+    if args.header_file:
+        shutil.copyfileobj(args.header_file, args.output_file)
+
     args.output_file.write(conf)
diff --git a/synapse/app/client_reader.py b/synapse/app/client_reader.py
index 5070094cad..beaea64a61 100644
--- a/synapse/app/client_reader.py
+++ b/synapse/app/client_reader.py
@@ -33,9 +33,13 @@ from synapse.replication.slave.storage._base import BaseSlavedStore
 from synapse.replication.slave.storage.account_data import SlavedAccountDataStore
 from synapse.replication.slave.storage.appservice import SlavedApplicationServiceStore
 from synapse.replication.slave.storage.client_ips import SlavedClientIpStore
+from synapse.replication.slave.storage.deviceinbox import SlavedDeviceInboxStore
+from synapse.replication.slave.storage.devices import SlavedDeviceStore
 from synapse.replication.slave.storage.directory import DirectoryStore
 from synapse.replication.slave.storage.events import SlavedEventStore
 from synapse.replication.slave.storage.keys import SlavedKeyStore
+from synapse.replication.slave.storage.push_rule import SlavedPushRuleStore
+from synapse.replication.slave.storage.receipts import SlavedReceiptsStore
 from synapse.replication.slave.storage.registration import SlavedRegistrationStore
 from synapse.replication.slave.storage.room import RoomStore
 from synapse.replication.slave.storage.transactions import SlavedTransactionStore
@@ -49,6 +53,7 @@ from synapse.rest.client.v1.room import (
     RoomStateRestServlet,
 )
 from synapse.rest.client.v2_alpha.account import ThreepidRestServlet
+from synapse.rest.client.v2_alpha.keys import KeyChangesServlet, KeyQueryServlet
 from synapse.rest.client.v2_alpha.register import RegisterRestServlet
 from synapse.server import HomeServer
 from synapse.storage.engines import create_engine
@@ -61,6 +66,10 @@ logger = logging.getLogger("synapse.app.client_reader")
 
 
 class ClientReaderSlavedStore(
+    SlavedDeviceInboxStore,
+    SlavedDeviceStore,
+    SlavedReceiptsStore,
+    SlavedPushRuleStore,
     SlavedAccountDataStore,
     SlavedEventStore,
     SlavedKeyStore,
@@ -98,6 +107,8 @@ class ClientReaderServer(HomeServer):
                     RegisterRestServlet(self).register(resource)
                     LoginRestServlet(self).register(resource)
                     ThreepidRestServlet(self).register(resource)
+                    KeyQueryServlet(self).register(resource)
+                    KeyChangesServlet(self).register(resource)
 
                     resources.update({
                         "/_matrix/client/r0": resource,
diff --git a/synapse/config/_base.py b/synapse/config/_base.py
index 5aec43b702..c4d3087fa4 100644
--- a/synapse/config/_base.py
+++ b/synapse/config/_base.py
@@ -180,9 +180,7 @@ class Config(object):
         Returns:
             str: the yaml config file
         """
-        default_config = "# vim:ft=yaml\n"
-
-        default_config += "\n\n".join(
+        default_config = "\n\n".join(
             dedent(conf)
             for conf in self.invoke_all(
                 "default_config",
@@ -297,19 +295,26 @@ class Config(object):
                         "Must specify a server_name to a generate config for."
                         " Pass -H server.name."
                     )
+
+                config_str = obj.generate_config(
+                    config_dir_path=config_dir_path,
+                    data_dir_path=os.getcwd(),
+                    server_name=server_name,
+                    report_stats=(config_args.report_stats == "yes"),
+                    generate_secrets=True,
+                )
+
                 if not cls.path_exists(config_dir_path):
                     os.makedirs(config_dir_path)
                 with open(config_path, "w") as config_file:
-                    config_str = obj.generate_config(
-                        config_dir_path=config_dir_path,
-                        data_dir_path=os.getcwd(),
-                        server_name=server_name,
-                        report_stats=(config_args.report_stats == "yes"),
-                        generate_secrets=True,
+                    config_file.write(
+                        "# vim:ft=yaml\n\n"
                     )
-                    config = yaml.load(config_str)
-                    obj.invoke_all("generate_files", config)
                     config_file.write(config_str)
+
+                config = yaml.load(config_str)
+                obj.invoke_all("generate_files", config)
+
                 print(
                     (
                         "A config file has been generated in %r for server name"
diff --git a/synapse/config/database.py b/synapse/config/database.py
index c8890147a6..63e9cb63f8 100644
--- a/synapse/config/database.py
+++ b/synapse/config/database.py
@@ -49,7 +49,8 @@ class DatabaseConfig(Config):
     def default_config(self, data_dir_path, **kwargs):
         database_path = os.path.join(data_dir_path, "homeserver.db")
         return """\
-        # Database configuration
+        ## Database ##
+
         database:
           # The database engine name
           name: "sqlite3"
diff --git a/synapse/config/logger.py b/synapse/config/logger.py
index f6940b65fd..464c28c2d9 100644
--- a/synapse/config/logger.py
+++ b/synapse/config/logger.py
@@ -81,7 +81,9 @@ class LoggingConfig(Config):
 
     def default_config(self, config_dir_path, server_name, **kwargs):
         log_config = os.path.join(config_dir_path, server_name + ".log.config")
-        return """
+        return """\
+        ## Logging ##
+
         # A yaml python logging config file
         #
         log_config: "%(log_config)s"
diff --git a/synapse/config/server.py b/synapse/config/server.py
index 4200f10da3..35a322fee0 100644
--- a/synapse/config/server.py
+++ b/synapse/config/server.py
@@ -260,9 +260,11 @@ class ServerConfig(Config):
         # This is used by remote servers to connect to this server,
         # e.g. matrix.org, localhost:8080, etc.
         # This is also the last part of your UserID.
+        #
         server_name: "%(server_name)s"
 
         # When running as a daemon, the file to store the pid in
+        #
         pid_file: %(pid_file)s
 
         # CPU affinity mask. Setting this restricts the CPUs on which the
@@ -304,9 +306,11 @@ class ServerConfig(Config):
         # Set the soft limit on the number of file descriptors synapse can use
         # Zero is used to indicate synapse should set the soft limit to the
         # hard limit.
+        #
         soft_file_limit: 0
 
         # Set to false to disable presence tracking on this homeserver.
+        #
         use_presence: true
 
         # The GC threshold parameters to pass to `gc.set_threshold`, if defined
diff --git a/synapse/handlers/device.py b/synapse/handlers/device.py
index c708c35d4d..c09a7c6280 100644
--- a/synapse/handlers/device.py
+++ b/synapse/handlers/device.py
@@ -37,13 +37,185 @@ from ._base import BaseHandler
 logger = logging.getLogger(__name__)
 
 
-class DeviceHandler(BaseHandler):
+class DeviceWorkerHandler(BaseHandler):
     def __init__(self, hs):
-        super(DeviceHandler, self).__init__(hs)
+        super(DeviceWorkerHandler, self).__init__(hs)
 
         self.hs = hs
         self.state = hs.get_state_handler()
         self._auth_handler = hs.get_auth_handler()
+
+    @defer.inlineCallbacks
+    def get_devices_by_user(self, user_id):
+        """
+        Retrieve the given user's devices
+
+        Args:
+            user_id (str):
+        Returns:
+            defer.Deferred: list[dict[str, X]]: info on each device
+        """
+
+        device_map = yield self.store.get_devices_by_user(user_id)
+
+        ips = yield self.store.get_last_client_ip_by_device(
+            user_id, device_id=None
+        )
+
+        devices = list(device_map.values())
+        for device in devices:
+            _update_device_from_client_ips(device, ips)
+
+        defer.returnValue(devices)
+
+    @defer.inlineCallbacks
+    def get_device(self, user_id, device_id):
+        """ Retrieve the given device
+
+        Args:
+            user_id (str):
+            device_id (str):
+
+        Returns:
+            defer.Deferred: dict[str, X]: info on the device
+        Raises:
+            errors.NotFoundError: if the device was not found
+        """
+        try:
+            device = yield self.store.get_device(user_id, device_id)
+        except errors.StoreError:
+            raise errors.NotFoundError
+        ips = yield self.store.get_last_client_ip_by_device(
+            user_id, device_id,
+        )
+        _update_device_from_client_ips(device, ips)
+        defer.returnValue(device)
+
+    @measure_func("device.get_user_ids_changed")
+    @defer.inlineCallbacks
+    def get_user_ids_changed(self, user_id, from_token):
+        """Get list of users that have had the devices updated, or have newly
+        joined a room, that `user_id` may be interested in.
+
+        Args:
+            user_id (str)
+            from_token (StreamToken)
+        """
+        now_room_key = yield self.store.get_room_events_max_id()
+
+        room_ids = yield self.store.get_rooms_for_user(user_id)
+
+        # First we check if any devices have changed
+        changed = yield self.store.get_user_whose_devices_changed(
+            from_token.device_list_key
+        )
+
+        # Then work out if any users have since joined
+        rooms_changed = self.store.get_rooms_that_changed(room_ids, from_token.room_key)
+
+        member_events = yield self.store.get_membership_changes_for_user(
+            user_id, from_token.room_key, now_room_key,
+        )
+        rooms_changed.update(event.room_id for event in member_events)
+
+        stream_ordering = RoomStreamToken.parse_stream_token(
+            from_token.room_key
+        ).stream
+
+        possibly_changed = set(changed)
+        possibly_left = set()
+        for room_id in rooms_changed:
+            current_state_ids = yield self.store.get_current_state_ids(room_id)
+
+            # The user may have left the room
+            # TODO: Check if they actually did or if we were just invited.
+            if room_id not in room_ids:
+                for key, event_id in iteritems(current_state_ids):
+                    etype, state_key = key
+                    if etype != EventTypes.Member:
+                        continue
+                    possibly_left.add(state_key)
+                continue
+
+            # Fetch the current state at the time.
+            try:
+                event_ids = yield self.store.get_forward_extremeties_for_room(
+                    room_id, stream_ordering=stream_ordering
+                )
+            except errors.StoreError:
+                # we have purged the stream_ordering index since the stream
+                # ordering: treat it the same as a new room
+                event_ids = []
+
+            # special-case for an empty prev state: include all members
+            # in the changed list
+            if not event_ids:
+                for key, event_id in iteritems(current_state_ids):
+                    etype, state_key = key
+                    if etype != EventTypes.Member:
+                        continue
+                    possibly_changed.add(state_key)
+                continue
+
+            current_member_id = current_state_ids.get((EventTypes.Member, user_id))
+            if not current_member_id:
+                continue
+
+            # mapping from event_id -> state_dict
+            prev_state_ids = yield self.store.get_state_ids_for_events(event_ids)
+
+            # Check if we've joined the room? If so we just blindly add all the users to
+            # the "possibly changed" users.
+            for state_dict in itervalues(prev_state_ids):
+                member_event = state_dict.get((EventTypes.Member, user_id), None)
+                if not member_event or member_event != current_member_id:
+                    for key, event_id in iteritems(current_state_ids):
+                        etype, state_key = key
+                        if etype != EventTypes.Member:
+                            continue
+                        possibly_changed.add(state_key)
+                    break
+
+            # If there has been any change in membership, include them in the
+            # possibly changed list. We'll check if they are joined below,
+            # and we're not toooo worried about spuriously adding users.
+            for key, event_id in iteritems(current_state_ids):
+                etype, state_key = key
+                if etype != EventTypes.Member:
+                    continue
+
+                # check if this member has changed since any of the extremities
+                # at the stream_ordering, and add them to the list if so.
+                for state_dict in itervalues(prev_state_ids):
+                    prev_event_id = state_dict.get(key, None)
+                    if not prev_event_id or prev_event_id != event_id:
+                        if state_key != user_id:
+                            possibly_changed.add(state_key)
+                        break
+
+        if possibly_changed or possibly_left:
+            users_who_share_room = yield self.store.get_users_who_share_room_with_user(
+                user_id
+            )
+
+            # Take the intersection of the users whose devices may have changed
+            # and those that actually still share a room with the user
+            possibly_joined = possibly_changed & users_who_share_room
+            possibly_left = (possibly_changed | possibly_left) - users_who_share_room
+        else:
+            possibly_joined = []
+            possibly_left = []
+
+        defer.returnValue({
+            "changed": list(possibly_joined),
+            "left": list(possibly_left),
+        })
+
+
+class DeviceHandler(DeviceWorkerHandler):
+    def __init__(self, hs):
+        super(DeviceHandler, self).__init__(hs)
+
         self.federation_sender = hs.get_federation_sender()
 
         self._edu_updater = DeviceListEduUpdater(hs, self)
@@ -104,52 +276,6 @@ class DeviceHandler(BaseHandler):
         raise errors.StoreError(500, "Couldn't generate a device ID.")
 
     @defer.inlineCallbacks
-    def get_devices_by_user(self, user_id):
-        """
-        Retrieve the given user's devices
-
-        Args:
-            user_id (str):
-        Returns:
-            defer.Deferred: list[dict[str, X]]: info on each device
-        """
-
-        device_map = yield self.store.get_devices_by_user(user_id)
-
-        ips = yield self.store.get_last_client_ip_by_device(
-            user_id, device_id=None
-        )
-
-        devices = list(device_map.values())
-        for device in devices:
-            _update_device_from_client_ips(device, ips)
-
-        defer.returnValue(devices)
-
-    @defer.inlineCallbacks
-    def get_device(self, user_id, device_id):
-        """ Retrieve the given device
-
-        Args:
-            user_id (str):
-            device_id (str):
-
-        Returns:
-            defer.Deferred: dict[str, X]: info on the device
-        Raises:
-            errors.NotFoundError: if the device was not found
-        """
-        try:
-            device = yield self.store.get_device(user_id, device_id)
-        except errors.StoreError:
-            raise errors.NotFoundError
-        ips = yield self.store.get_last_client_ip_by_device(
-            user_id, device_id,
-        )
-        _update_device_from_client_ips(device, ips)
-        defer.returnValue(device)
-
-    @defer.inlineCallbacks
     def delete_device(self, user_id, device_id):
         """ Delete the given device
 
@@ -287,126 +413,6 @@ class DeviceHandler(BaseHandler):
             for host in hosts:
                 self.federation_sender.send_device_messages(host)
 
-    @measure_func("device.get_user_ids_changed")
-    @defer.inlineCallbacks
-    def get_user_ids_changed(self, user_id, from_token):
-        """Get list of users that have had the devices updated, or have newly
-        joined a room, that `user_id` may be interested in.
-
-        Args:
-            user_id (str)
-            from_token (StreamToken)
-        """
-        now_token = yield self.hs.get_event_sources().get_current_token()
-
-        room_ids = yield self.store.get_rooms_for_user(user_id)
-
-        # First we check if any devices have changed
-        changed = yield self.store.get_user_whose_devices_changed(
-            from_token.device_list_key
-        )
-
-        # Then work out if any users have since joined
-        rooms_changed = self.store.get_rooms_that_changed(room_ids, from_token.room_key)
-
-        member_events = yield self.store.get_membership_changes_for_user(
-            user_id, from_token.room_key, now_token.room_key
-        )
-        rooms_changed.update(event.room_id for event in member_events)
-
-        stream_ordering = RoomStreamToken.parse_stream_token(
-            from_token.room_key
-        ).stream
-
-        possibly_changed = set(changed)
-        possibly_left = set()
-        for room_id in rooms_changed:
-            current_state_ids = yield self.store.get_current_state_ids(room_id)
-
-            # The user may have left the room
-            # TODO: Check if they actually did or if we were just invited.
-            if room_id not in room_ids:
-                for key, event_id in iteritems(current_state_ids):
-                    etype, state_key = key
-                    if etype != EventTypes.Member:
-                        continue
-                    possibly_left.add(state_key)
-                continue
-
-            # Fetch the current state at the time.
-            try:
-                event_ids = yield self.store.get_forward_extremeties_for_room(
-                    room_id, stream_ordering=stream_ordering
-                )
-            except errors.StoreError:
-                # we have purged the stream_ordering index since the stream
-                # ordering: treat it the same as a new room
-                event_ids = []
-
-            # special-case for an empty prev state: include all members
-            # in the changed list
-            if not event_ids:
-                for key, event_id in iteritems(current_state_ids):
-                    etype, state_key = key
-                    if etype != EventTypes.Member:
-                        continue
-                    possibly_changed.add(state_key)
-                continue
-
-            current_member_id = current_state_ids.get((EventTypes.Member, user_id))
-            if not current_member_id:
-                continue
-
-            # mapping from event_id -> state_dict
-            prev_state_ids = yield self.store.get_state_ids_for_events(event_ids)
-
-            # Check if we've joined the room? If so we just blindly add all the users to
-            # the "possibly changed" users.
-            for state_dict in itervalues(prev_state_ids):
-                member_event = state_dict.get((EventTypes.Member, user_id), None)
-                if not member_event or member_event != current_member_id:
-                    for key, event_id in iteritems(current_state_ids):
-                        etype, state_key = key
-                        if etype != EventTypes.Member:
-                            continue
-                        possibly_changed.add(state_key)
-                    break
-
-            # If there has been any change in membership, include them in the
-            # possibly changed list. We'll check if they are joined below,
-            # and we're not toooo worried about spuriously adding users.
-            for key, event_id in iteritems(current_state_ids):
-                etype, state_key = key
-                if etype != EventTypes.Member:
-                    continue
-
-                # check if this member has changed since any of the extremities
-                # at the stream_ordering, and add them to the list if so.
-                for state_dict in itervalues(prev_state_ids):
-                    prev_event_id = state_dict.get(key, None)
-                    if not prev_event_id or prev_event_id != event_id:
-                        if state_key != user_id:
-                            possibly_changed.add(state_key)
-                        break
-
-        if possibly_changed or possibly_left:
-            users_who_share_room = yield self.store.get_users_who_share_room_with_user(
-                user_id
-            )
-
-            # Take the intersection of the users whose devices may have changed
-            # and those that actually still share a room with the user
-            possibly_joined = possibly_changed & users_who_share_room
-            possibly_left = (possibly_changed | possibly_left) - users_who_share_room
-        else:
-            possibly_joined = []
-            possibly_left = []
-
-        defer.returnValue({
-            "changed": list(possibly_joined),
-            "left": list(possibly_left),
-        })
-
     @defer.inlineCallbacks
     def on_federation_query_user_devices(self, user_id):
         stream_id, devices = yield self.store.get_devices_with_keys_by_user(user_id)
diff --git a/synapse/handlers/federation.py b/synapse/handlers/federation.py
index f80486102a..72b63d64d0 100644
--- a/synapse/handlers/federation.py
+++ b/synapse/handlers/federation.py
@@ -858,6 +858,52 @@ class FederationHandler(BaseHandler):
             logger.debug("Not backfilling as no extremeties found.")
             return
 
+        # We only want to paginate if we can actually see the events we'll get,
+        # as otherwise we'll just spend a lot of resources to get redacted
+        # events.
+        #
+        # We do this by filtering all the backwards extremities and seeing if
+        # any remain. Given we don't have the extremity events themselves, we
+        # need to actually check the events that reference them.
+        #
+        # *Note*: the spec wants us to keep backfilling until we reach the start
+        # of the room in case we are allowed to see some of the history. However
+        # in practice that causes more issues than its worth, as a) its
+        # relatively rare for there to be any visible history and b) even when
+        # there is its often sufficiently long ago that clients would stop
+        # attempting to paginate before backfill reached the visible history.
+        #
+        # TODO: If we do do a backfill then we should filter the backwards
+        #   extremities to only include those that point to visible portions of
+        #   history.
+        #
+        # TODO: Correctly handle the case where we are allowed to see the
+        #   forward event but not the backward extremity, e.g. in the case of
+        #   initial join of the server where we are allowed to see the join
+        #   event but not anything before it. This would require looking at the
+        #   state *before* the event, ignoring the special casing certain event
+        #   types have.
+
+        forward_events = yield self.store.get_successor_events(
+            list(extremities),
+        )
+
+        extremities_events = yield self.store.get_events(
+            forward_events,
+            check_redacted=False,
+            get_prev_content=False,
+        )
+
+        # We set `check_history_visibility_only` as we might otherwise get false
+        # positives from users having been erased.
+        filtered_extremities = yield filter_events_for_server(
+            self.store, self.server_name, list(extremities_events.values()),
+            redact=False, check_history_visibility_only=True,
+        )
+
+        if not filtered_extremities:
+            defer.returnValue(False)
+
         # Check if we reached a point where we should start backfilling.
         sorted_extremeties_tuple = sorted(
             extremities.items(),
diff --git a/synapse/handlers/receipts.py b/synapse/handlers/receipts.py
index 8b2d03a756..1728089667 100644
--- a/synapse/handlers/receipts.py
+++ b/synapse/handlers/receipts.py
@@ -16,7 +16,6 @@ import logging
 
 from twisted.internet import defer
 
-from synapse.metrics.background_process_metrics import run_as_background_process
 from synapse.types import get_domain_from_id
 
 from ._base import BaseHandler
@@ -39,31 +38,6 @@ class ReceiptsHandler(BaseHandler):
         self.state = hs.get_state_handler()
 
     @defer.inlineCallbacks
-    def received_client_receipt(self, room_id, receipt_type, user_id,
-                                event_id):
-        """Called when a client tells us a local user has read up to the given
-        event_id in the room.
-        """
-        receipt = {
-            "room_id": room_id,
-            "receipt_type": receipt_type,
-            "user_id": user_id,
-            "event_ids": [event_id],
-            "data": {
-                "ts": int(self.clock.time_msec()),
-            }
-        }
-
-        is_new = yield self._handle_new_receipts([receipt])
-
-        if is_new:
-            # fire off a process in the background to send the receipt to
-            # remote servers
-            run_as_background_process(
-                'push_receipts_to_remotes', self._push_remotes, receipt
-            )
-
-    @defer.inlineCallbacks
     def _received_remote_receipt(self, origin, content):
         """Called when we receive an EDU of type m.receipt from a remote HS.
         """
@@ -128,43 +102,54 @@ class ReceiptsHandler(BaseHandler):
         defer.returnValue(True)
 
     @defer.inlineCallbacks
-    def _push_remotes(self, receipt):
-        """Given a receipt, works out which remote servers should be
-        poked and pokes them.
+    def received_client_receipt(self, room_id, receipt_type, user_id,
+                                event_id):
+        """Called when a client tells us a local user has read up to the given
+        event_id in the room.
         """
-        try:
-            # TODO: optimise this to move some of the work to the workers.
-            room_id = receipt["room_id"]
-            receipt_type = receipt["receipt_type"]
-            user_id = receipt["user_id"]
-            event_ids = receipt["event_ids"]
-            data = receipt["data"]
+        receipt = {
+            "room_id": room_id,
+            "receipt_type": receipt_type,
+            "user_id": user_id,
+            "event_ids": [event_id],
+            "data": {
+                "ts": int(self.clock.time_msec()),
+            }
+        }
 
-            users = yield self.state.get_current_user_in_room(room_id)
-            remotedomains = set(get_domain_from_id(u) for u in users)
-            remotedomains = remotedomains.copy()
-            remotedomains.discard(self.server_name)
-
-            logger.debug("Sending receipt to: %r", remotedomains)
-
-            for domain in remotedomains:
-                self.federation.build_and_send_edu(
-                    destination=domain,
-                    edu_type="m.receipt",
-                    content={
-                        room_id: {
-                            receipt_type: {
-                                user_id: {
-                                    "event_ids": event_ids,
-                                    "data": data,
-                                }
+        is_new = yield self._handle_new_receipts([receipt])
+        if not is_new:
+            return
+
+        # Work out which remote servers should be poked and poke them.
+
+        # TODO: optimise this to move some of the work to the workers.
+        data = receipt["data"]
+
+        # XXX why does this not use state.get_current_hosts_in_room() ?
+        users = yield self.state.get_current_user_in_room(room_id)
+        remotedomains = set(get_domain_from_id(u) for u in users)
+        remotedomains = remotedomains.copy()
+        remotedomains.discard(self.server_name)
+
+        logger.debug("Sending receipt to: %r", remotedomains)
+
+        for domain in remotedomains:
+            self.federation.build_and_send_edu(
+                destination=domain,
+                edu_type="m.receipt",
+                content={
+                    room_id: {
+                        receipt_type: {
+                            user_id: {
+                                "event_ids": [event_id],
+                                "data": data,
                             }
-                        },
+                        }
                     },
-                    key=(room_id, receipt_type, user_id),
-                )
-        except Exception:
-            logger.exception("Error pushing receipts to remote servers")
+                },
+                key=(room_id, receipt_type, user_id),
+            )
 
     @defer.inlineCallbacks
     def get_receipts_for_room(self, room_id, to_key):
diff --git a/synapse/notifier.py b/synapse/notifier.py
index de02b1017e..ff589660da 100644
--- a/synapse/notifier.py
+++ b/synapse/notifier.py
@@ -178,8 +178,6 @@ class Notifier(object):
             self.remove_expired_streams, self.UNUSED_STREAM_EXPIRY_MS
         )
 
-        self.replication_deferred = ObservableDeferred(defer.Deferred())
-
         # This is not a very cheap test to perform, but it's only executed
         # when rendering the metrics page, which is likely once per minute at
         # most when scraping it.
@@ -205,7 +203,9 @@ class Notifier(object):
 
     def add_replication_callback(self, cb):
         """Add a callback that will be called when some new data is available.
-        Callback is not given any arguments.
+        Callback is not given any arguments. It should *not* return a Deferred - if
+        it needs to do any asynchronous work, a background thread should be started and
+        wrapped with run_as_background_process.
         """
         self.replication_callbacks.append(cb)
 
@@ -517,60 +517,5 @@ class Notifier(object):
 
     def notify_replication(self):
         """Notify the any replication listeners that there's a new event"""
-        with PreserveLoggingContext():
-            deferred = self.replication_deferred
-            self.replication_deferred = ObservableDeferred(defer.Deferred())
-            deferred.callback(None)
-
-            # the callbacks may well outlast the current request, so we run
-            # them in the sentinel logcontext.
-            #
-            # (ideally it would be up to the callbacks to know if they were
-            # starting off background processes and drop the logcontext
-            # accordingly, but that requires more changes)
-            for cb in self.replication_callbacks:
-                cb()
-
-    @defer.inlineCallbacks
-    def wait_for_replication(self, callback, timeout):
-        """Wait for an event to happen.
-
-        Args:
-            callback: Gets called whenever an event happens. If this returns a
-                truthy value then ``wait_for_replication`` returns, otherwise
-                it waits for another event.
-            timeout: How many milliseconds to wait for callback return a truthy
-                value.
-
-        Returns:
-            A deferred that resolves with the value returned by the callback.
-        """
-        listener = _NotificationListener(None)
-
-        end_time = self.clock.time_msec() + timeout
-
-        while True:
-            listener.deferred = self.replication_deferred.observe()
-            result = yield callback()
-            if result:
-                break
-
-            now = self.clock.time_msec()
-            if end_time <= now:
-                break
-
-            listener.deferred = timeout_deferred(
-                listener.deferred,
-                timeout=(end_time - now) / 1000.,
-                reactor=self.hs.get_reactor(),
-            )
-
-            try:
-                with PreserveLoggingContext():
-                    yield listener.deferred
-            except defer.TimeoutError:
-                break
-            except defer.CancelledError:
-                break
-
-        defer.returnValue(result)
+        for cb in self.replication_callbacks:
+            cb()
diff --git a/synapse/replication/slave/storage/deviceinbox.py b/synapse/replication/slave/storage/deviceinbox.py
index 4f19fd35aa..4d59778863 100644
--- a/synapse/replication/slave/storage/deviceinbox.py
+++ b/synapse/replication/slave/storage/deviceinbox.py
@@ -13,15 +13,14 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from synapse.storage import DataStore
+from synapse.replication.slave.storage._base import BaseSlavedStore
+from synapse.replication.slave.storage._slaved_id_tracker import SlavedIdTracker
+from synapse.storage.deviceinbox import DeviceInboxWorkerStore
 from synapse.util.caches.expiringcache import ExpiringCache
 from synapse.util.caches.stream_change_cache import StreamChangeCache
 
-from ._base import BaseSlavedStore, __func__
-from ._slaved_id_tracker import SlavedIdTracker
 
-
-class SlavedDeviceInboxStore(BaseSlavedStore):
+class SlavedDeviceInboxStore(DeviceInboxWorkerStore, BaseSlavedStore):
     def __init__(self, db_conn, hs):
         super(SlavedDeviceInboxStore, self).__init__(db_conn, hs)
         self._device_inbox_id_gen = SlavedIdTracker(
@@ -43,12 +42,6 @@ class SlavedDeviceInboxStore(BaseSlavedStore):
             expiry_ms=30 * 60 * 1000,
         )
 
-    get_to_device_stream_token = __func__(DataStore.get_to_device_stream_token)
-    get_new_messages_for_device = __func__(DataStore.get_new_messages_for_device)
-    get_new_device_msgs_for_remote = __func__(DataStore.get_new_device_msgs_for_remote)
-    delete_messages_for_device = __func__(DataStore.delete_messages_for_device)
-    delete_device_msgs_for_remote = __func__(DataStore.delete_device_msgs_for_remote)
-
     def stream_positions(self):
         result = super(SlavedDeviceInboxStore, self).stream_positions()
         result["to_device"] = self._device_inbox_id_gen.get_current_token()
diff --git a/synapse/replication/slave/storage/devices.py b/synapse/replication/slave/storage/devices.py
index ec2fd561cc..16c9a162c5 100644
--- a/synapse/replication/slave/storage/devices.py
+++ b/synapse/replication/slave/storage/devices.py
@@ -13,15 +13,14 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from synapse.storage import DataStore
-from synapse.storage.end_to_end_keys import EndToEndKeyStore
+from synapse.replication.slave.storage._base import BaseSlavedStore
+from synapse.replication.slave.storage._slaved_id_tracker import SlavedIdTracker
+from synapse.storage.devices import DeviceWorkerStore
+from synapse.storage.end_to_end_keys import EndToEndKeyWorkerStore
 from synapse.util.caches.stream_change_cache import StreamChangeCache
 
-from ._base import BaseSlavedStore, __func__
-from ._slaved_id_tracker import SlavedIdTracker
 
-
-class SlavedDeviceStore(BaseSlavedStore):
+class SlavedDeviceStore(EndToEndKeyWorkerStore, DeviceWorkerStore, BaseSlavedStore):
     def __init__(self, db_conn, hs):
         super(SlavedDeviceStore, self).__init__(db_conn, hs)
 
@@ -38,17 +37,6 @@ class SlavedDeviceStore(BaseSlavedStore):
             "DeviceListFederationStreamChangeCache", device_list_max,
         )
 
-    get_device_stream_token = __func__(DataStore.get_device_stream_token)
-    get_user_whose_devices_changed = __func__(DataStore.get_user_whose_devices_changed)
-    get_devices_by_remote = __func__(DataStore.get_devices_by_remote)
-    _get_devices_by_remote_txn = __func__(DataStore._get_devices_by_remote_txn)
-    _get_e2e_device_keys_txn = __func__(DataStore._get_e2e_device_keys_txn)
-    mark_as_sent_devices_by_remote = __func__(DataStore.mark_as_sent_devices_by_remote)
-    _mark_as_sent_devices_by_remote_txn = (
-        __func__(DataStore._mark_as_sent_devices_by_remote_txn)
-    )
-    count_e2e_one_time_keys = EndToEndKeyStore.__dict__["count_e2e_one_time_keys"]
-
     def stream_positions(self):
         result = super(SlavedDeviceStore, self).stream_positions()
         result["device_lists"] = self._device_list_id_gen.get_current_token()
@@ -58,14 +46,23 @@ class SlavedDeviceStore(BaseSlavedStore):
         if stream_name == "device_lists":
             self._device_list_id_gen.advance(token)
             for row in rows:
-                self._device_list_stream_cache.entity_has_changed(
-                    row.user_id, token
+                self._invalidate_caches_for_devices(
+                    token, row.user_id, row.destination,
                 )
-
-                if row.destination:
-                    self._device_list_federation_stream_cache.entity_has_changed(
-                        row.destination, token
-                    )
         return super(SlavedDeviceStore, self).process_replication_rows(
             stream_name, token, rows
         )
+
+    def _invalidate_caches_for_devices(self, token, user_id, destination):
+        self._device_list_stream_cache.entity_has_changed(
+            user_id, token
+        )
+
+        if destination:
+            self._device_list_federation_stream_cache.entity_has_changed(
+                destination, token
+            )
+
+        self._get_cached_devices_for_user.invalidate((user_id,))
+        self._get_cached_user_device.invalidate_many((user_id,))
+        self.get_device_list_last_stream_id_for_remote.invalidate((user_id,))
diff --git a/synapse/replication/slave/storage/push_rule.py b/synapse/replication/slave/storage/push_rule.py
index f0200c1e98..45fc913c52 100644
--- a/synapse/replication/slave/storage/push_rule.py
+++ b/synapse/replication/slave/storage/push_rule.py
@@ -20,7 +20,7 @@ from ._slaved_id_tracker import SlavedIdTracker
 from .events import SlavedEventStore
 
 
-class SlavedPushRuleStore(PushRulesWorkerStore, SlavedEventStore):
+class SlavedPushRuleStore(SlavedEventStore, PushRulesWorkerStore):
     def __init__(self, db_conn, hs):
         self._push_rules_stream_id_gen = SlavedIdTracker(
             db_conn, "push_rules_stream", "stream_id",
diff --git a/synapse/server.py b/synapse/server.py
index 4d364fccce..4323e7ff12 100644
--- a/synapse/server.py
+++ b/synapse/server.py
@@ -51,7 +51,7 @@ from synapse.handlers.acme import AcmeHandler
 from synapse.handlers.appservice import ApplicationServicesHandler
 from synapse.handlers.auth import AuthHandler, MacaroonGenerator
 from synapse.handlers.deactivate_account import DeactivateAccountHandler
-from synapse.handlers.device import DeviceHandler
+from synapse.handlers.device import DeviceHandler, DeviceWorkerHandler
 from synapse.handlers.devicemessage import DeviceMessageHandler
 from synapse.handlers.e2e_keys import E2eKeysHandler
 from synapse.handlers.e2e_room_keys import E2eRoomKeysHandler
@@ -307,7 +307,10 @@ class HomeServer(object):
         return MacaroonGenerator(self)
 
     def build_device_handler(self):
-        return DeviceHandler(self)
+        if self.config.worker_app:
+            return DeviceWorkerHandler(self)
+        else:
+            return DeviceHandler(self)
 
     def build_device_message_handler(self):
         return DeviceMessageHandler(self)
diff --git a/synapse/storage/deviceinbox.py b/synapse/storage/deviceinbox.py
index e06b0bc56d..e6a42a53bb 100644
--- a/synapse/storage/deviceinbox.py
+++ b/synapse/storage/deviceinbox.py
@@ -19,14 +19,174 @@ from canonicaljson import json
 
 from twisted.internet import defer
 
+from synapse.storage._base import SQLBaseStore
+from synapse.storage.background_updates import BackgroundUpdateStore
 from synapse.util.caches.expiringcache import ExpiringCache
 
-from .background_updates import BackgroundUpdateStore
-
 logger = logging.getLogger(__name__)
 
 
-class DeviceInboxStore(BackgroundUpdateStore):
+class DeviceInboxWorkerStore(SQLBaseStore):
+    def get_to_device_stream_token(self):
+        return self._device_inbox_id_gen.get_current_token()
+
+    def get_new_messages_for_device(
+        self, user_id, device_id, last_stream_id, current_stream_id, limit=100
+    ):
+        """
+        Args:
+            user_id(str): The recipient user_id.
+            device_id(str): The recipient device_id.
+            current_stream_id(int): The current position of the to device
+                message stream.
+        Returns:
+            Deferred ([dict], int): List of messages for the device and where
+                in the stream the messages got to.
+        """
+        has_changed = self._device_inbox_stream_cache.has_entity_changed(
+            user_id, last_stream_id
+        )
+        if not has_changed:
+            return defer.succeed(([], current_stream_id))
+
+        def get_new_messages_for_device_txn(txn):
+            sql = (
+                "SELECT stream_id, message_json FROM device_inbox"
+                " WHERE user_id = ? AND device_id = ?"
+                " AND ? < stream_id AND stream_id <= ?"
+                " ORDER BY stream_id ASC"
+                " LIMIT ?"
+            )
+            txn.execute(sql, (
+                user_id, device_id, last_stream_id, current_stream_id, limit
+            ))
+            messages = []
+            for row in txn:
+                stream_pos = row[0]
+                messages.append(json.loads(row[1]))
+            if len(messages) < limit:
+                stream_pos = current_stream_id
+            return (messages, stream_pos)
+
+        return self.runInteraction(
+            "get_new_messages_for_device", get_new_messages_for_device_txn,
+        )
+
+    @defer.inlineCallbacks
+    def delete_messages_for_device(self, user_id, device_id, up_to_stream_id):
+        """
+        Args:
+            user_id(str): The recipient user_id.
+            device_id(str): The recipient device_id.
+            up_to_stream_id(int): Where to delete messages up to.
+        Returns:
+            A deferred that resolves to the number of messages deleted.
+        """
+        # If we have cached the last stream id we've deleted up to, we can
+        # check if there is likely to be anything that needs deleting
+        last_deleted_stream_id = self._last_device_delete_cache.get(
+            (user_id, device_id), None
+        )
+        if last_deleted_stream_id:
+            has_changed = self._device_inbox_stream_cache.has_entity_changed(
+                user_id, last_deleted_stream_id
+            )
+            if not has_changed:
+                defer.returnValue(0)
+
+        def delete_messages_for_device_txn(txn):
+            sql = (
+                "DELETE FROM device_inbox"
+                " WHERE user_id = ? AND device_id = ?"
+                " AND stream_id <= ?"
+            )
+            txn.execute(sql, (user_id, device_id, up_to_stream_id))
+            return txn.rowcount
+
+        count = yield self.runInteraction(
+            "delete_messages_for_device", delete_messages_for_device_txn
+        )
+
+        # Update the cache, ensuring that we only ever increase the value
+        last_deleted_stream_id = self._last_device_delete_cache.get(
+            (user_id, device_id), 0
+        )
+        self._last_device_delete_cache[(user_id, device_id)] = max(
+            last_deleted_stream_id, up_to_stream_id
+        )
+
+        defer.returnValue(count)
+
+    def get_new_device_msgs_for_remote(
+        self, destination, last_stream_id, current_stream_id, limit=100
+    ):
+        """
+        Args:
+            destination(str): The name of the remote server.
+            last_stream_id(int|long): The last position of the device message stream
+                that the server sent up to.
+            current_stream_id(int|long): The current position of the device
+                message stream.
+        Returns:
+            Deferred ([dict], int|long): List of messages for the device and where
+                in the stream the messages got to.
+        """
+
+        has_changed = self._device_federation_outbox_stream_cache.has_entity_changed(
+            destination, last_stream_id
+        )
+        if not has_changed or last_stream_id == current_stream_id:
+            return defer.succeed(([], current_stream_id))
+
+        def get_new_messages_for_remote_destination_txn(txn):
+            sql = (
+                "SELECT stream_id, messages_json FROM device_federation_outbox"
+                " WHERE destination = ?"
+                " AND ? < stream_id AND stream_id <= ?"
+                " ORDER BY stream_id ASC"
+                " LIMIT ?"
+            )
+            txn.execute(sql, (
+                destination, last_stream_id, current_stream_id, limit
+            ))
+            messages = []
+            for row in txn:
+                stream_pos = row[0]
+                messages.append(json.loads(row[1]))
+            if len(messages) < limit:
+                stream_pos = current_stream_id
+            return (messages, stream_pos)
+
+        return self.runInteraction(
+            "get_new_device_msgs_for_remote",
+            get_new_messages_for_remote_destination_txn,
+        )
+
+    def delete_device_msgs_for_remote(self, destination, up_to_stream_id):
+        """Used to delete messages when the remote destination acknowledges
+        their receipt.
+
+        Args:
+            destination(str): The destination server_name
+            up_to_stream_id(int): Where to delete messages up to.
+        Returns:
+            A deferred that resolves when the messages have been deleted.
+        """
+        def delete_messages_for_remote_destination_txn(txn):
+            sql = (
+                "DELETE FROM device_federation_outbox"
+                " WHERE destination = ?"
+                " AND stream_id <= ?"
+            )
+            txn.execute(sql, (destination, up_to_stream_id))
+
+        return self.runInteraction(
+            "delete_device_msgs_for_remote",
+            delete_messages_for_remote_destination_txn
+        )
+
+
+class DeviceInboxStore(DeviceInboxWorkerStore, BackgroundUpdateStore):
     DEVICE_INBOX_STREAM_ID = "device_inbox_stream_drop"
 
     def __init__(self, db_conn, hs):
@@ -220,93 +380,6 @@ class DeviceInboxStore(BackgroundUpdateStore):
 
         txn.executemany(sql, rows)
 
-    def get_new_messages_for_device(
-        self, user_id, device_id, last_stream_id, current_stream_id, limit=100
-    ):
-        """
-        Args:
-            user_id(str): The recipient user_id.
-            device_id(str): The recipient device_id.
-            current_stream_id(int): The current position of the to device
-                message stream.
-        Returns:
-            Deferred ([dict], int): List of messages for the device and where
-                in the stream the messages got to.
-        """
-        has_changed = self._device_inbox_stream_cache.has_entity_changed(
-            user_id, last_stream_id
-        )
-        if not has_changed:
-            return defer.succeed(([], current_stream_id))
-
-        def get_new_messages_for_device_txn(txn):
-            sql = (
-                "SELECT stream_id, message_json FROM device_inbox"
-                " WHERE user_id = ? AND device_id = ?"
-                " AND ? < stream_id AND stream_id <= ?"
-                " ORDER BY stream_id ASC"
-                " LIMIT ?"
-            )
-            txn.execute(sql, (
-                user_id, device_id, last_stream_id, current_stream_id, limit
-            ))
-            messages = []
-            for row in txn:
-                stream_pos = row[0]
-                messages.append(json.loads(row[1]))
-            if len(messages) < limit:
-                stream_pos = current_stream_id
-            return (messages, stream_pos)
-
-        return self.runInteraction(
-            "get_new_messages_for_device", get_new_messages_for_device_txn,
-        )
-
-    @defer.inlineCallbacks
-    def delete_messages_for_device(self, user_id, device_id, up_to_stream_id):
-        """
-        Args:
-            user_id(str): The recipient user_id.
-            device_id(str): The recipient device_id.
-            up_to_stream_id(int): Where to delete messages up to.
-        Returns:
-            A deferred that resolves to the number of messages deleted.
-        """
-        # If we have cached the last stream id we've deleted up to, we can
-        # check if there is likely to be anything that needs deleting
-        last_deleted_stream_id = self._last_device_delete_cache.get(
-            (user_id, device_id), None
-        )
-        if last_deleted_stream_id:
-            has_changed = self._device_inbox_stream_cache.has_entity_changed(
-                user_id, last_deleted_stream_id
-            )
-            if not has_changed:
-                defer.returnValue(0)
-
-        def delete_messages_for_device_txn(txn):
-            sql = (
-                "DELETE FROM device_inbox"
-                " WHERE user_id = ? AND device_id = ?"
-                " AND stream_id <= ?"
-            )
-            txn.execute(sql, (user_id, device_id, up_to_stream_id))
-            return txn.rowcount
-
-        count = yield self.runInteraction(
-            "delete_messages_for_device", delete_messages_for_device_txn
-        )
-
-        # Update the cache, ensuring that we only ever increase the value
-        last_deleted_stream_id = self._last_device_delete_cache.get(
-            (user_id, device_id), 0
-        )
-        self._last_device_delete_cache[(user_id, device_id)] = max(
-            last_deleted_stream_id, up_to_stream_id
-        )
-
-        defer.returnValue(count)
-
     def get_all_new_device_messages(self, last_pos, current_pos, limit):
         """
         Args:
@@ -351,77 +424,6 @@ class DeviceInboxStore(BackgroundUpdateStore):
             "get_all_new_device_messages", get_all_new_device_messages_txn
         )
 
-    def get_to_device_stream_token(self):
-        return self._device_inbox_id_gen.get_current_token()
-
-    def get_new_device_msgs_for_remote(
-        self, destination, last_stream_id, current_stream_id, limit=100
-    ):
-        """
-        Args:
-            destination(str): The name of the remote server.
-            last_stream_id(int|long): The last position of the device message stream
-                that the server sent up to.
-            current_stream_id(int|long): The current position of the device
-                message stream.
-        Returns:
-            Deferred ([dict], int|long): List of messages for the device and where
-                in the stream the messages got to.
-        """
-
-        has_changed = self._device_federation_outbox_stream_cache.has_entity_changed(
-            destination, last_stream_id
-        )
-        if not has_changed or last_stream_id == current_stream_id:
-            return defer.succeed(([], current_stream_id))
-
-        def get_new_messages_for_remote_destination_txn(txn):
-            sql = (
-                "SELECT stream_id, messages_json FROM device_federation_outbox"
-                " WHERE destination = ?"
-                " AND ? < stream_id AND stream_id <= ?"
-                " ORDER BY stream_id ASC"
-                " LIMIT ?"
-            )
-            txn.execute(sql, (
-                destination, last_stream_id, current_stream_id, limit
-            ))
-            messages = []
-            for row in txn:
-                stream_pos = row[0]
-                messages.append(json.loads(row[1]))
-            if len(messages) < limit:
-                stream_pos = current_stream_id
-            return (messages, stream_pos)
-
-        return self.runInteraction(
-            "get_new_device_msgs_for_remote",
-            get_new_messages_for_remote_destination_txn,
-        )
-
-    def delete_device_msgs_for_remote(self, destination, up_to_stream_id):
-        """Used to delete messages when the remote destination acknowledges
-        their receipt.
-
-        Args:
-            destination(str): The destination server_name
-            up_to_stream_id(int): Where to delete messages up to.
-        Returns:
-            A deferred that resolves when the messages have been deleted.
-        """
-        def delete_messages_for_remote_destination_txn(txn):
-            sql = (
-                "DELETE FROM device_federation_outbox"
-                " WHERE destination = ?"
-                " AND stream_id <= ?"
-            )
-            txn.execute(sql, (destination, up_to_stream_id))
-
-        return self.runInteraction(
-            "delete_device_msgs_for_remote",
-            delete_messages_for_remote_destination_txn
-        )
-
     @defer.inlineCallbacks
     def _background_drop_index_device_inbox(self, progress, batch_size):
         def reindex_txn(conn):
diff --git a/synapse/storage/devices.py b/synapse/storage/devices.py
index ecdab34e7d..e716dc1437 100644
--- a/synapse/storage/devices.py
+++ b/synapse/storage/devices.py
@@ -22,11 +22,10 @@ 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 Cache, SQLBaseStore, db_to_json
 from synapse.storage.background_updates import BackgroundUpdateStore
 from synapse.util.caches.descriptors import cached, cachedInlineCallbacks, cachedList
 
-from ._base import Cache, db_to_json
-
 logger = logging.getLogger(__name__)
 
 DROP_DEVICE_LIST_STREAMS_NON_UNIQUE_INDEXES = (
@@ -34,7 +33,343 @@ DROP_DEVICE_LIST_STREAMS_NON_UNIQUE_INDEXES = (
 )
 
 
-class DeviceStore(BackgroundUpdateStore):
+class DeviceWorkerStore(SQLBaseStore):
+    def get_device(self, user_id, device_id):
+        """Retrieve a device.
+
+        Args:
+            user_id (str): The ID of the user which owns the device
+            device_id (str): The ID of the device to retrieve
+        Returns:
+            defer.Deferred for a dict containing the device information
+        Raises:
+            StoreError: if the device is not found
+        """
+        return self._simple_select_one(
+            table="devices",
+            keyvalues={"user_id": user_id, "device_id": device_id},
+            retcols=("user_id", "device_id", "display_name"),
+            desc="get_device",
+        )
+
+    @defer.inlineCallbacks
+    def get_devices_by_user(self, user_id):
+        """Retrieve all of a user's registered devices.
+
+        Args:
+            user_id (str):
+        Returns:
+            defer.Deferred: resolves to a dict from device_id to a dict
+            containing "device_id", "user_id" and "display_name" for each
+            device.
+        """
+        devices = yield self._simple_select_list(
+            table="devices",
+            keyvalues={"user_id": user_id},
+            retcols=("user_id", "device_id", "display_name"),
+            desc="get_devices_by_user"
+        )
+
+        defer.returnValue({d["device_id"]: d for d in devices})
+
+    def get_devices_by_remote(self, destination, from_stream_id):
+        """Get stream of updates to send to remote servers
+
+        Returns:
+            (int, list[dict]): current stream id and list of updates
+        """
+        now_stream_id = self._device_list_id_gen.get_current_token()
+
+        has_changed = self._device_list_federation_stream_cache.has_entity_changed(
+            destination, int(from_stream_id)
+        )
+        if not has_changed:
+            return (now_stream_id, [])
+
+        return self.runInteraction(
+            "get_devices_by_remote", self._get_devices_by_remote_txn,
+            destination, from_stream_id, now_stream_id,
+        )
+
+    def _get_devices_by_remote_txn(self, txn, destination, from_stream_id,
+                                   now_stream_id):
+        sql = """
+            SELECT user_id, device_id, max(stream_id) FROM device_lists_outbound_pokes
+            WHERE destination = ? AND ? < stream_id AND stream_id <= ? AND sent = ?
+            GROUP BY user_id, device_id
+            LIMIT 20
+        """
+        txn.execute(
+            sql, (destination, from_stream_id, now_stream_id, False)
+        )
+
+        # maps (user_id, device_id) -> stream_id
+        query_map = {(r[0], r[1]): r[2] for r in txn}
+        if not query_map:
+            return (now_stream_id, [])
+
+        if len(query_map) >= 20:
+            now_stream_id = max(stream_id for stream_id in itervalues(query_map))
+
+        devices = self._get_e2e_device_keys_txn(
+            txn, query_map.keys(), include_all_devices=True, include_deleted_devices=True
+        )
+
+        prev_sent_id_sql = """
+            SELECT coalesce(max(stream_id), 0) as stream_id
+            FROM device_lists_outbound_last_success
+            WHERE destination = ? AND user_id = ? AND stream_id <= ?
+        """
+
+        results = []
+        for user_id, user_devices in iteritems(devices):
+            # The prev_id for the first row is always the last row before
+            # `from_stream_id`
+            txn.execute(prev_sent_id_sql, (destination, user_id, from_stream_id))
+            rows = txn.fetchall()
+            prev_id = rows[0][0]
+            for device_id, device in iteritems(user_devices):
+                stream_id = query_map[(user_id, device_id)]
+                result = {
+                    "user_id": user_id,
+                    "device_id": device_id,
+                    "prev_id": [prev_id] if prev_id else [],
+                    "stream_id": stream_id,
+                }
+
+                prev_id = stream_id
+
+                if device is not None:
+                    key_json = device.get("key_json", None)
+                    if key_json:
+                        result["keys"] = db_to_json(key_json)
+                    device_display_name = device.get("device_display_name", None)
+                    if device_display_name:
+                        result["device_display_name"] = device_display_name
+                else:
+                    result["deleted"] = True
+
+                results.append(result)
+
+        return (now_stream_id, results)
+
+    def mark_as_sent_devices_by_remote(self, destination, stream_id):
+        """Mark that updates have successfully been sent to the destination.
+        """
+        return self.runInteraction(
+            "mark_as_sent_devices_by_remote", self._mark_as_sent_devices_by_remote_txn,
+            destination, stream_id,
+        )
+
+    def _mark_as_sent_devices_by_remote_txn(self, txn, destination, stream_id):
+        # We update the device_lists_outbound_last_success with the successfully
+        # poked users. We do the join to see which users need to be inserted and
+        # which updated.
+        sql = """
+            SELECT user_id, coalesce(max(o.stream_id), 0), (max(s.stream_id) IS NOT NULL)
+            FROM device_lists_outbound_pokes as o
+            LEFT JOIN device_lists_outbound_last_success as s
+                USING (destination, user_id)
+            WHERE destination = ? AND o.stream_id <= ?
+            GROUP BY user_id
+        """
+        txn.execute(sql, (destination, stream_id,))
+        rows = txn.fetchall()
+
+        sql = """
+            UPDATE device_lists_outbound_last_success
+            SET stream_id = ?
+            WHERE destination = ? AND user_id = ?
+        """
+        txn.executemany(
+            sql, ((row[1], destination, row[0],) for row in rows if row[2])
+        )
+
+        sql = """
+            INSERT INTO device_lists_outbound_last_success
+            (destination, user_id, stream_id) VALUES (?, ?, ?)
+        """
+        txn.executemany(
+            sql, ((destination, row[0], row[1],) for row in rows if not row[2])
+        )
+
+        # Delete all sent outbound pokes
+        sql = """
+            DELETE FROM device_lists_outbound_pokes
+            WHERE destination = ? AND stream_id <= ?
+        """
+        txn.execute(sql, (destination, stream_id,))
+
+    def get_device_stream_token(self):
+        return self._device_list_id_gen.get_current_token()
+
+    @defer.inlineCallbacks
+    def get_user_devices_from_cache(self, query_list):
+        """Get the devices (and keys if any) for remote users from the cache.
+
+        Args:
+            query_list(list): List of (user_id, device_ids), if device_ids is
+                falsey then return all device ids for that user.
+
+        Returns:
+            (user_ids_not_in_cache, results_map), where user_ids_not_in_cache is
+            a set of user_ids and results_map is a mapping of
+            user_id -> device_id -> device_info
+        """
+        user_ids = set(user_id for user_id, _ in query_list)
+        user_map = yield self.get_device_list_last_stream_id_for_remotes(list(user_ids))
+        user_ids_in_cache = set(
+            user_id for user_id, stream_id in user_map.items() if stream_id
+        )
+        user_ids_not_in_cache = user_ids - user_ids_in_cache
+
+        results = {}
+        for user_id, device_id in query_list:
+            if user_id not in user_ids_in_cache:
+                continue
+
+            if device_id:
+                device = yield self._get_cached_user_device(user_id, device_id)
+                results.setdefault(user_id, {})[device_id] = device
+            else:
+                results[user_id] = yield self._get_cached_devices_for_user(user_id)
+
+        defer.returnValue((user_ids_not_in_cache, results))
+
+    @cachedInlineCallbacks(num_args=2, tree=True)
+    def _get_cached_user_device(self, user_id, device_id):
+        content = yield self._simple_select_one_onecol(
+            table="device_lists_remote_cache",
+            keyvalues={
+                "user_id": user_id,
+                "device_id": device_id,
+            },
+            retcol="content",
+            desc="_get_cached_user_device",
+        )
+        defer.returnValue(db_to_json(content))
+
+    @cachedInlineCallbacks()
+    def _get_cached_devices_for_user(self, user_id):
+        devices = yield self._simple_select_list(
+            table="device_lists_remote_cache",
+            keyvalues={
+                "user_id": user_id,
+            },
+            retcols=("device_id", "content"),
+            desc="_get_cached_devices_for_user",
+        )
+        defer.returnValue({
+            device["device_id"]: db_to_json(device["content"])
+            for device in devices
+        })
+
+    def get_devices_with_keys_by_user(self, user_id):
+        """Get all devices (with any device keys) for a user
+
+        Returns:
+            (stream_id, devices)
+        """
+        return self.runInteraction(
+            "get_devices_with_keys_by_user",
+            self._get_devices_with_keys_by_user_txn, user_id,
+        )
+
+    def _get_devices_with_keys_by_user_txn(self, txn, user_id):
+        now_stream_id = self._device_list_id_gen.get_current_token()
+
+        devices = self._get_e2e_device_keys_txn(
+            txn, [(user_id, None)], include_all_devices=True
+        )
+
+        if devices:
+            user_devices = devices[user_id]
+            results = []
+            for device_id, device in iteritems(user_devices):
+                result = {
+                    "device_id": device_id,
+                }
+
+                key_json = device.get("key_json", None)
+                if key_json:
+                    result["keys"] = db_to_json(key_json)
+                device_display_name = device.get("device_display_name", None)
+                if device_display_name:
+                    result["device_display_name"] = device_display_name
+
+                results.append(result)
+
+            return now_stream_id, results
+
+        return now_stream_id, []
+
+    @defer.inlineCallbacks
+    def get_user_whose_devices_changed(self, from_key):
+        """Get set of users whose devices have changed since `from_key`.
+        """
+        from_key = int(from_key)
+        changed = self._device_list_stream_cache.get_all_entities_changed(from_key)
+        if changed is not None:
+            defer.returnValue(set(changed))
+
+        sql = """
+            SELECT DISTINCT user_id FROM device_lists_stream WHERE stream_id > ?
+        """
+        rows = yield self._execute("get_user_whose_devices_changed", None, sql, from_key)
+        defer.returnValue(set(row[0] for row in rows))
+
+    def get_all_device_list_changes_for_remotes(self, from_key, to_key):
+        """Return a list of `(stream_id, user_id, destination)` which is the
+        combined list of changes to devices, and which destinations need to be
+        poked. `destination` may be None if no destinations need to be poked.
+        """
+        # We do a group by here as there can be a large number of duplicate
+        # entries, since we throw away device IDs.
+        sql = """
+            SELECT MAX(stream_id) AS stream_id, user_id, destination
+            FROM device_lists_stream
+            LEFT JOIN device_lists_outbound_pokes USING (stream_id, user_id, device_id)
+            WHERE ? < stream_id AND stream_id <= ?
+            GROUP BY user_id, destination
+        """
+        return self._execute(
+            "get_all_device_list_changes_for_remotes", None,
+            sql, from_key, to_key
+        )
+
+    @cached(max_entries=10000)
+    def get_device_list_last_stream_id_for_remote(self, user_id):
+        """Get the last stream_id we got for a user. May be None if we haven't
+        got any information for them.
+        """
+        return self._simple_select_one_onecol(
+            table="device_lists_remote_extremeties",
+            keyvalues={"user_id": user_id},
+            retcol="stream_id",
+            desc="get_device_list_last_stream_id_for_remote",
+            allow_none=True,
+        )
+
+    @cachedList(cached_method_name="get_device_list_last_stream_id_for_remote",
+                list_name="user_ids", inlineCallbacks=True)
+    def get_device_list_last_stream_id_for_remotes(self, user_ids):
+        rows = yield self._simple_select_many_batch(
+            table="device_lists_remote_extremeties",
+            column="user_id",
+            iterable=user_ids,
+            retcols=("user_id", "stream_id",),
+            desc="get_device_list_last_stream_id_for_remotes",
+        )
+
+        results = {user_id: None for user_id in user_ids}
+        results.update({
+            row["user_id"]: row["stream_id"] for row in rows
+        })
+
+        defer.returnValue(results)
+
+
+class DeviceStore(DeviceWorkerStore, BackgroundUpdateStore):
     def __init__(self, db_conn, hs):
         super(DeviceStore, self).__init__(db_conn, hs)
 
@@ -121,24 +456,6 @@ class DeviceStore(BackgroundUpdateStore):
                          initial_device_display_name, e)
             raise StoreError(500, "Problem storing device.")
 
-    def get_device(self, user_id, device_id):
-        """Retrieve a device.
-
-        Args:
-            user_id (str): The ID of the user which owns the device
-            device_id (str): The ID of the device to retrieve
-        Returns:
-            defer.Deferred for a dict containing the device information
-        Raises:
-            StoreError: if the device is not found
-        """
-        return self._simple_select_one(
-            table="devices",
-            keyvalues={"user_id": user_id, "device_id": device_id},
-            retcols=("user_id", "device_id", "display_name"),
-            desc="get_device",
-        )
-
     @defer.inlineCallbacks
     def delete_device(self, user_id, device_id):
         """Delete a device.
@@ -203,57 +520,6 @@ class DeviceStore(BackgroundUpdateStore):
         )
 
     @defer.inlineCallbacks
-    def get_devices_by_user(self, user_id):
-        """Retrieve all of a user's registered devices.
-
-        Args:
-            user_id (str):
-        Returns:
-            defer.Deferred: resolves to a dict from device_id to a dict
-            containing "device_id", "user_id" and "display_name" for each
-            device.
-        """
-        devices = yield self._simple_select_list(
-            table="devices",
-            keyvalues={"user_id": user_id},
-            retcols=("user_id", "device_id", "display_name"),
-            desc="get_devices_by_user"
-        )
-
-        defer.returnValue({d["device_id"]: d for d in devices})
-
-    @cached(max_entries=10000)
-    def get_device_list_last_stream_id_for_remote(self, user_id):
-        """Get the last stream_id we got for a user. May be None if we haven't
-        got any information for them.
-        """
-        return self._simple_select_one_onecol(
-            table="device_lists_remote_extremeties",
-            keyvalues={"user_id": user_id},
-            retcol="stream_id",
-            desc="get_device_list_remote_extremity",
-            allow_none=True,
-        )
-
-    @cachedList(cached_method_name="get_device_list_last_stream_id_for_remote",
-                list_name="user_ids", inlineCallbacks=True)
-    def get_device_list_last_stream_id_for_remotes(self, user_ids):
-        rows = yield self._simple_select_many_batch(
-            table="device_lists_remote_extremeties",
-            column="user_id",
-            iterable=user_ids,
-            retcols=("user_id", "stream_id",),
-            desc="get_user_devices_from_cache",
-        )
-
-        results = {user_id: None for user_id in user_ids}
-        results.update({
-            row["user_id"]: row["stream_id"] for row in rows
-        })
-
-        defer.returnValue(results)
-
-    @defer.inlineCallbacks
     def mark_remote_user_device_list_as_unsubscribed(self, user_id):
         """Mark that we no longer track device lists for remote user.
         """
@@ -405,268 +671,6 @@ class DeviceStore(BackgroundUpdateStore):
             lock=False,
         )
 
-    def get_devices_by_remote(self, destination, from_stream_id):
-        """Get stream of updates to send to remote servers
-
-        Returns:
-            (int, list[dict]): current stream id and list of updates
-        """
-        now_stream_id = self._device_list_id_gen.get_current_token()
-
-        has_changed = self._device_list_federation_stream_cache.has_entity_changed(
-            destination, int(from_stream_id)
-        )
-        if not has_changed:
-            return (now_stream_id, [])
-
-        return self.runInteraction(
-            "get_devices_by_remote", self._get_devices_by_remote_txn,
-            destination, from_stream_id, now_stream_id,
-        )
-
-    def _get_devices_by_remote_txn(self, txn, destination, from_stream_id,
-                                   now_stream_id):
-        sql = """
-            SELECT user_id, device_id, max(stream_id) FROM device_lists_outbound_pokes
-            WHERE destination = ? AND ? < stream_id AND stream_id <= ? AND sent = ?
-            GROUP BY user_id, device_id
-            LIMIT 20
-        """
-        txn.execute(
-            sql, (destination, from_stream_id, now_stream_id, False)
-        )
-
-        # maps (user_id, device_id) -> stream_id
-        query_map = {(r[0], r[1]): r[2] for r in txn}
-        if not query_map:
-            return (now_stream_id, [])
-
-        if len(query_map) >= 20:
-            now_stream_id = max(stream_id for stream_id in itervalues(query_map))
-
-        devices = self._get_e2e_device_keys_txn(
-            txn, query_map.keys(), include_all_devices=True, include_deleted_devices=True
-        )
-
-        prev_sent_id_sql = """
-            SELECT coalesce(max(stream_id), 0) as stream_id
-            FROM device_lists_outbound_last_success
-            WHERE destination = ? AND user_id = ? AND stream_id <= ?
-        """
-
-        results = []
-        for user_id, user_devices in iteritems(devices):
-            # The prev_id for the first row is always the last row before
-            # `from_stream_id`
-            txn.execute(prev_sent_id_sql, (destination, user_id, from_stream_id))
-            rows = txn.fetchall()
-            prev_id = rows[0][0]
-            for device_id, device in iteritems(user_devices):
-                stream_id = query_map[(user_id, device_id)]
-                result = {
-                    "user_id": user_id,
-                    "device_id": device_id,
-                    "prev_id": [prev_id] if prev_id else [],
-                    "stream_id": stream_id,
-                }
-
-                prev_id = stream_id
-
-                if device is not None:
-                    key_json = device.get("key_json", None)
-                    if key_json:
-                        result["keys"] = db_to_json(key_json)
-                    device_display_name = device.get("device_display_name", None)
-                    if device_display_name:
-                        result["device_display_name"] = device_display_name
-                else:
-                    result["deleted"] = True
-
-                results.append(result)
-
-        return (now_stream_id, results)
-
-    @defer.inlineCallbacks
-    def get_user_devices_from_cache(self, query_list):
-        """Get the devices (and keys if any) for remote users from the cache.
-
-        Args:
-            query_list(list): List of (user_id, device_ids), if device_ids is
-                falsey then return all device ids for that user.
-
-        Returns:
-            (user_ids_not_in_cache, results_map), where user_ids_not_in_cache is
-            a set of user_ids and results_map is a mapping of
-            user_id -> device_id -> device_info
-        """
-        user_ids = set(user_id for user_id, _ in query_list)
-        user_map = yield self.get_device_list_last_stream_id_for_remotes(list(user_ids))
-        user_ids_in_cache = set(
-            user_id for user_id, stream_id in user_map.items() if stream_id
-        )
-        user_ids_not_in_cache = user_ids - user_ids_in_cache
-
-        results = {}
-        for user_id, device_id in query_list:
-            if user_id not in user_ids_in_cache:
-                continue
-
-            if device_id:
-                device = yield self._get_cached_user_device(user_id, device_id)
-                results.setdefault(user_id, {})[device_id] = device
-            else:
-                results[user_id] = yield self._get_cached_devices_for_user(user_id)
-
-        defer.returnValue((user_ids_not_in_cache, results))
-
-    @cachedInlineCallbacks(num_args=2, tree=True)
-    def _get_cached_user_device(self, user_id, device_id):
-        content = yield self._simple_select_one_onecol(
-            table="device_lists_remote_cache",
-            keyvalues={
-                "user_id": user_id,
-                "device_id": device_id,
-            },
-            retcol="content",
-            desc="_get_cached_user_device",
-        )
-        defer.returnValue(db_to_json(content))
-
-    @cachedInlineCallbacks()
-    def _get_cached_devices_for_user(self, user_id):
-        devices = yield self._simple_select_list(
-            table="device_lists_remote_cache",
-            keyvalues={
-                "user_id": user_id,
-            },
-            retcols=("device_id", "content"),
-            desc="_get_cached_devices_for_user",
-        )
-        defer.returnValue({
-            device["device_id"]: db_to_json(device["content"])
-            for device in devices
-        })
-
-    def get_devices_with_keys_by_user(self, user_id):
-        """Get all devices (with any device keys) for a user
-
-        Returns:
-            (stream_id, devices)
-        """
-        return self.runInteraction(
-            "get_devices_with_keys_by_user",
-            self._get_devices_with_keys_by_user_txn, user_id,
-        )
-
-    def _get_devices_with_keys_by_user_txn(self, txn, user_id):
-        now_stream_id = self._device_list_id_gen.get_current_token()
-
-        devices = self._get_e2e_device_keys_txn(
-            txn, [(user_id, None)], include_all_devices=True
-        )
-
-        if devices:
-            user_devices = devices[user_id]
-            results = []
-            for device_id, device in iteritems(user_devices):
-                result = {
-                    "device_id": device_id,
-                }
-
-                key_json = device.get("key_json", None)
-                if key_json:
-                    result["keys"] = db_to_json(key_json)
-                device_display_name = device.get("device_display_name", None)
-                if device_display_name:
-                    result["device_display_name"] = device_display_name
-
-                results.append(result)
-
-            return now_stream_id, results
-
-        return now_stream_id, []
-
-    def mark_as_sent_devices_by_remote(self, destination, stream_id):
-        """Mark that updates have successfully been sent to the destination.
-        """
-        return self.runInteraction(
-            "mark_as_sent_devices_by_remote", self._mark_as_sent_devices_by_remote_txn,
-            destination, stream_id,
-        )
-
-    def _mark_as_sent_devices_by_remote_txn(self, txn, destination, stream_id):
-        # We update the device_lists_outbound_last_success with the successfully
-        # poked users. We do the join to see which users need to be inserted and
-        # which updated.
-        sql = """
-            SELECT user_id, coalesce(max(o.stream_id), 0), (max(s.stream_id) IS NOT NULL)
-            FROM device_lists_outbound_pokes as o
-            LEFT JOIN device_lists_outbound_last_success as s
-                USING (destination, user_id)
-            WHERE destination = ? AND o.stream_id <= ?
-            GROUP BY user_id
-        """
-        txn.execute(sql, (destination, stream_id,))
-        rows = txn.fetchall()
-
-        sql = """
-            UPDATE device_lists_outbound_last_success
-            SET stream_id = ?
-            WHERE destination = ? AND user_id = ?
-        """
-        txn.executemany(
-            sql, ((row[1], destination, row[0],) for row in rows if row[2])
-        )
-
-        sql = """
-            INSERT INTO device_lists_outbound_last_success
-            (destination, user_id, stream_id) VALUES (?, ?, ?)
-        """
-        txn.executemany(
-            sql, ((destination, row[0], row[1],) for row in rows if not row[2])
-        )
-
-        # Delete all sent outbound pokes
-        sql = """
-            DELETE FROM device_lists_outbound_pokes
-            WHERE destination = ? AND stream_id <= ?
-        """
-        txn.execute(sql, (destination, stream_id,))
-
-    @defer.inlineCallbacks
-    def get_user_whose_devices_changed(self, from_key):
-        """Get set of users whose devices have changed since `from_key`.
-        """
-        from_key = int(from_key)
-        changed = self._device_list_stream_cache.get_all_entities_changed(from_key)
-        if changed is not None:
-            defer.returnValue(set(changed))
-
-        sql = """
-            SELECT DISTINCT user_id FROM device_lists_stream WHERE stream_id > ?
-        """
-        rows = yield self._execute("get_user_whose_devices_changed", None, sql, from_key)
-        defer.returnValue(set(row[0] for row in rows))
-
-    def get_all_device_list_changes_for_remotes(self, from_key, to_key):
-        """Return a list of `(stream_id, user_id, destination)` which is the
-        combined list of changes to devices, and which destinations need to be
-        poked. `destination` may be None if no destinations need to be poked.
-        """
-        # We do a group by here as there can be a large number of duplicate
-        # entries, since we throw away device IDs.
-        sql = """
-            SELECT MAX(stream_id) AS stream_id, user_id, destination
-            FROM device_lists_stream
-            LEFT JOIN device_lists_outbound_pokes USING (stream_id, user_id, device_id)
-            WHERE ? < stream_id AND stream_id <= ?
-            GROUP BY user_id, destination
-        """
-        return self._execute(
-            "get_all_device_list_changes_for_remotes", None,
-            sql, from_key, to_key
-        )
-
     @defer.inlineCallbacks
     def add_device_change_to_streams(self, user_id, device_ids, hosts):
         """Persist that a user's devices have been updated, and which hosts
@@ -732,9 +736,6 @@ class DeviceStore(BackgroundUpdateStore):
             ]
         )
 
-    def get_device_stream_token(self):
-        return self._device_list_id_gen.get_current_token()
-
     def _prune_old_outbound_device_pokes(self):
         """Delete old entries out of the device_lists_outbound_pokes to ensure
         that we don't fill up due to dead servers. We keep one entry per
diff --git a/synapse/storage/end_to_end_keys.py b/synapse/storage/end_to_end_keys.py
index 2a0f6cfca9..e381e472a2 100644
--- a/synapse/storage/end_to_end_keys.py
+++ b/synapse/storage/end_to_end_keys.py
@@ -23,49 +23,7 @@ from synapse.util.caches.descriptors import cached
 from ._base import SQLBaseStore, db_to_json
 
 
-class EndToEndKeyStore(SQLBaseStore):
-    def set_e2e_device_keys(self, user_id, device_id, time_now, device_keys):
-        """Stores device keys for a device. Returns whether there was a change
-        or the keys were already in the database.
-        """
-        def _set_e2e_device_keys_txn(txn):
-            old_key_json = self._simple_select_one_onecol_txn(
-                txn,
-                table="e2e_device_keys_json",
-                keyvalues={
-                    "user_id": user_id,
-                    "device_id": device_id,
-                },
-                retcol="key_json",
-                allow_none=True,
-            )
-
-            # In py3 we need old_key_json to match new_key_json type. The DB
-            # returns unicode while encode_canonical_json returns bytes.
-            new_key_json = encode_canonical_json(device_keys).decode("utf-8")
-
-            if old_key_json == new_key_json:
-                return False
-
-            self._simple_upsert_txn(
-                txn,
-                table="e2e_device_keys_json",
-                keyvalues={
-                    "user_id": user_id,
-                    "device_id": device_id,
-                },
-                values={
-                    "ts_added_ms": time_now,
-                    "key_json": new_key_json,
-                }
-            )
-
-            return True
-
-        return self.runInteraction(
-            "set_e2e_device_keys", _set_e2e_device_keys_txn
-        )
-
+class EndToEndKeyWorkerStore(SQLBaseStore):
     @defer.inlineCallbacks
     def get_e2e_device_keys(
         self, query_list, include_all_devices=False,
@@ -238,6 +196,50 @@ class EndToEndKeyStore(SQLBaseStore):
             "count_e2e_one_time_keys", _count_e2e_one_time_keys
         )
 
+
+class EndToEndKeyStore(EndToEndKeyWorkerStore, SQLBaseStore):
+    def set_e2e_device_keys(self, user_id, device_id, time_now, device_keys):
+        """Stores device keys for a device. Returns whether there was a change
+        or the keys were already in the database.
+        """
+        def _set_e2e_device_keys_txn(txn):
+            old_key_json = self._simple_select_one_onecol_txn(
+                txn,
+                table="e2e_device_keys_json",
+                keyvalues={
+                    "user_id": user_id,
+                    "device_id": device_id,
+                },
+                retcol="key_json",
+                allow_none=True,
+            )
+
+            # In py3 we need old_key_json to match new_key_json type. The DB
+            # returns unicode while encode_canonical_json returns bytes.
+            new_key_json = encode_canonical_json(device_keys).decode("utf-8")
+
+            if old_key_json == new_key_json:
+                return False
+
+            self._simple_upsert_txn(
+                txn,
+                table="e2e_device_keys_json",
+                keyvalues={
+                    "user_id": user_id,
+                    "device_id": device_id,
+                },
+                values={
+                    "ts_added_ms": time_now,
+                    "key_json": new_key_json,
+                }
+            )
+
+            return True
+
+        return self.runInteraction(
+            "set_e2e_device_keys", _set_e2e_device_keys_txn
+        )
+
     def claim_e2e_one_time_keys(self, query_list):
         """Take a list of one time keys out of the database"""
         def _claim_e2e_one_time_keys(txn):
diff --git a/synapse/storage/event_federation.py b/synapse/storage/event_federation.py
index 38809ed0fc..a8d90456e3 100644
--- a/synapse/storage/event_federation.py
+++ b/synapse/storage/event_federation.py
@@ -442,6 +442,28 @@ class EventFederationWorkerStore(EventsWorkerStore, SignatureWorkerStore,
         event_results.reverse()
         return event_results
 
+    @defer.inlineCallbacks
+    def get_successor_events(self, event_ids):
+        """Fetch all events that have the given events as a prev event
+
+        Args:
+            event_ids (iterable[str])
+
+        Returns:
+            Deferred[list[str]]
+        """
+        rows = yield self._simple_select_many_batch(
+            table="event_edges",
+            column="prev_event_id",
+            iterable=event_ids,
+            retcols=("event_id",),
+            desc="get_successor_events"
+        )
+
+        defer.returnValue([
+            row["event_id"] for row in rows
+        ])
+
 
 class EventFederationStore(EventFederationWorkerStore):
     """ Responsible for storing and serving up the various graphs associated
diff --git a/synapse/storage/receipts.py b/synapse/storage/receipts.py
index 0ac665e967..0fd1ccc40a 100644
--- a/synapse/storage/receipts.py
+++ b/synapse/storage/receipts.py
@@ -346,15 +346,23 @@ class ReceiptsStore(ReceiptsWorkerStore):
 
     def insert_linearized_receipt_txn(self, txn, room_id, receipt_type,
                                       user_id, event_id, data, stream_id):
+        """Inserts a read-receipt into the database if it's newer than the current RR
+
+        Returns: int|None
+            None if the RR is older than the current RR
+            otherwise, the rx timestamp of the event that the RR corresponds to
+                (or 0 if the event is unknown)
+        """
         res = self._simple_select_one_txn(
             txn,
             table="events",
-            retcols=["topological_ordering", "stream_ordering"],
+            retcols=["stream_ordering", "received_ts"],
             keyvalues={"event_id": event_id},
             allow_none=True
         )
 
         stream_ordering = int(res["stream_ordering"]) if res else None
+        rx_ts = res["received_ts"] if res else 0
 
         # We don't want to clobber receipts for more recent events, so we
         # have to compare orderings of existing receipts
@@ -373,7 +381,7 @@ class ReceiptsStore(ReceiptsWorkerStore):
                         "one for later event %s",
                         event_id, eid,
                     )
-                    return False
+                    return None
 
         txn.call_after(
             self.get_receipts_for_room.invalidate, (room_id, receipt_type)
@@ -429,7 +437,7 @@ class ReceiptsStore(ReceiptsWorkerStore):
                 stream_ordering=stream_ordering,
             )
 
-        return True
+        return rx_ts
 
     @defer.inlineCallbacks
     def insert_receipt(self, room_id, receipt_type, user_id, event_ids, data):
@@ -466,7 +474,7 @@ class ReceiptsStore(ReceiptsWorkerStore):
 
         stream_id_manager = self._receipts_id_gen.get_next()
         with stream_id_manager as stream_id:
-            have_persisted = yield self.runInteraction(
+            event_ts = yield self.runInteraction(
                 "insert_linearized_receipt",
                 self.insert_linearized_receipt_txn,
                 room_id, receipt_type, user_id, linearized_event_id,
@@ -474,8 +482,14 @@ class ReceiptsStore(ReceiptsWorkerStore):
                 stream_id=stream_id,
             )
 
-            if not have_persisted:
-                defer.returnValue(None)
+        if event_ts is None:
+            defer.returnValue(None)
+
+        now = self._clock.time_msec()
+        logger.debug(
+            "RR for event %s in %s (%i ms old)",
+            linearized_event_id, room_id, now - event_ts,
+        )
 
         yield self.insert_graph_receipt(
             room_id, receipt_type, user_id, event_ids, data
diff --git a/synapse/visibility.py b/synapse/visibility.py
index 0281a7c919..efec21673b 100644
--- a/synapse/visibility.py
+++ b/synapse/visibility.py
@@ -216,28 +216,36 @@ def filter_events_for_client(store, user_id, events, is_peeking=False,
 
 
 @defer.inlineCallbacks
-def filter_events_for_server(store, server_name, events):
-    # Whatever else we do, we need to check for senders which have requested
-    # erasure of their data.
-    erased_senders = yield store.are_users_erased(
-        (e.sender for e in events),
-    )
+def filter_events_for_server(store, server_name, events, redact=True,
+                             check_history_visibility_only=False):
+    """Filter a list of events based on whether given server is allowed to
+    see them.
 
-    def redact_disallowed(event, state):
-        # if the sender has been gdpr17ed, always return a redacted
-        # copy of the event.
-        if erased_senders[event.sender]:
+    Args:
+        store (DataStore)
+        server_name (str)
+        events (iterable[FrozenEvent])
+        redact (bool): Whether to return a redacted version of the event, or
+            to filter them out entirely.
+        check_history_visibility_only (bool): Whether to only check the
+            history visibility, rather than things like if the sender has been
+            erased. This is used e.g. during pagination to decide whether to
+            backfill or not.
+
+    Returns
+        Deferred[list[FrozenEvent]]
+    """
+
+    def is_sender_erased(event, erased_senders):
+        if erased_senders and erased_senders[event.sender]:
             logger.info(
                 "Sender of %s has been erased, redacting",
                 event.event_id,
             )
-            return prune_event(event)
-
-        # state will be None if we decided we didn't need to filter by
-        # room membership.
-        if not state:
-            return event
+            return True
+        return False
 
+    def check_event_is_visible(event, state):
         history = state.get((EventTypes.RoomHistoryVisibility, ''), None)
         if history:
             visibility = history.content.get("history_visibility", "shared")
@@ -259,17 +267,17 @@ def filter_events_for_server(store, server_name, events):
 
                     memtype = ev.membership
                     if memtype == Membership.JOIN:
-                        return event
+                        return True
                     elif memtype == Membership.INVITE:
                         if visibility == "invited":
-                            return event
+                            return True
                 else:
                     # server has no users in the room: redact
-                    return prune_event(event)
+                    return False
 
-        return event
+        return True
 
-    # Next lets check to see if all the events have a history visibility
+    # Lets check to see if all the events have a history visibility
     # of "shared" or "world_readable". If thats the case then we don't
     # need to check membership (as we know the server is in the room).
     event_to_state_ids = yield store.get_state_ids_for_events(
@@ -296,16 +304,31 @@ def filter_events_for_server(store, server_name, events):
             for e in itervalues(event_map)
         )
 
+    if not check_history_visibility_only:
+        erased_senders = yield store.are_users_erased(
+            (e.sender for e in events),
+        )
+    else:
+        # We don't want to check whether users are erased, which is equivalent
+        # to no users having been erased.
+        erased_senders = {}
+
     if all_open:
         # all the history_visibility state affecting these events is open, so
         # we don't need to filter by membership state. We *do* need to check
         # for user erasure, though.
         if erased_senders:
-            events = [
-                redact_disallowed(e, None)
-                for e in events
-            ]
+            to_return = []
+            for e in events:
+                if not is_sender_erased(e, erased_senders):
+                    to_return.append(e)
+                elif redact:
+                    to_return.append(prune_event(e))
+
+            defer.returnValue(to_return)
 
+        # If there are no erased users then we can just return the given list
+        # of events without having to copy it.
         defer.returnValue(events)
 
     # Ok, so we're dealing with events that have non-trivial visibility
@@ -361,7 +384,13 @@ def filter_events_for_server(store, server_name, events):
         for e_id, key_to_eid in iteritems(event_to_state_ids)
     }
 
-    defer.returnValue([
-        redact_disallowed(e, event_to_state[e.event_id])
-        for e in events
-    ])
+    to_return = []
+    for e in events:
+        erased = is_sender_erased(e, erased_senders)
+        visible = check_event_is_visible(e, event_to_state[e.event_id])
+        if visible and not erased:
+            to_return.append(e)
+        elif redact:
+            to_return.append(prune_event(e))
+
+    defer.returnValue(to_return)
diff --git a/tox.ini b/tox.ini
index 14437e7334..19080a648f 100644
--- a/tox.ini
+++ b/tox.ini
@@ -118,6 +118,9 @@ commands =
    python -m towncrier.check --compare-with=origin/develop
 basepython = python3.6
 
+[testenv:check-sampleconfig]
+commands = {toxinidir}/scripts-dev/generate_sample_config --check
+
 [testenv:codecov]
 skip_install = True
 deps =