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-rw-r--r--docs/metrics-howto.rst8
-rw-r--r--synapse/app/appservice.py4
-rw-r--r--synapse/app/client_reader.py4
-rw-r--r--synapse/app/federation_reader.py4
-rw-r--r--synapse/app/media_repository.py4
-rw-r--r--synapse/app/pusher.py4
-rw-r--r--synapse/app/synchrotron.py2
-rw-r--r--synapse/config/repository.py2
-rw-r--r--synapse/handlers/auth.py2
-rw-r--r--synapse/handlers/message.py15
-rw-r--r--synapse/http/server.py23
-rw-r--r--synapse/metrics/__init__.py16
-rw-r--r--synapse/metrics/process_collector.py65
-rw-r--r--synapse/rest/media/v1/download_resource.py3
-rw-r--r--synapse/rest/media/v1/thumbnail_resource.py3
-rw-r--r--synapse/storage/prepare_database.py2
-rw-r--r--synapse/storage/pusher.py13
-rw-r--r--synapse/storage/schema/delta/38/postgres_fts_gist.sql17
-rw-r--r--synapse/storage/search.py27
-rw-r--r--synapse/storage/transactions.py154
20 files changed, 131 insertions, 241 deletions
diff --git a/docs/metrics-howto.rst b/docs/metrics-howto.rst
index 7aa4757a35..ca10799b00 100644
--- a/docs/metrics-howto.rst
+++ b/docs/metrics-howto.rst
@@ -51,9 +51,9 @@ python_gc_counts            reactor_gc_counts
 
 The twisted-specific reactor metrics have been renamed.
 
-==================================== =================
+==================================== =====================
 New name                             Old name
------------------------------------- -----------------
-python_twisted_reactor_pending_calls reactor_tick_time
+------------------------------------ ---------------------
+python_twisted_reactor_pending_calls reactor_pending_calls
 python_twisted_reactor_tick_time     reactor_tick_time
-==================================== =================
+==================================== =====================
diff --git a/synapse/app/appservice.py b/synapse/app/appservice.py
index 4e62a84b28..dd9ee406a1 100644
--- a/synapse/app/appservice.py
+++ b/synapse/app/appservice.py
@@ -34,6 +34,8 @@ from synapse.util.manhole import manhole
 from synapse.util.rlimit import change_resource_limit
 from synapse.util.versionstring import get_version_string
 
+from synapse import events
+
 from twisted.internet import reactor, defer
 from twisted.web.resource import Resource
 
@@ -151,6 +153,8 @@ def start(config_options):
 
     setup_logging(config.worker_log_config, config.worker_log_file)
 
+    events.USE_FROZEN_DICTS = config.use_frozen_dicts
+
     database_engine = create_engine(config.database_config)
 
     if config.notify_appservices:
diff --git a/synapse/app/client_reader.py b/synapse/app/client_reader.py
index 9fccc73db3..0086a2977e 100644
--- a/synapse/app/client_reader.py
+++ b/synapse/app/client_reader.py
@@ -41,6 +41,8 @@ from synapse.util.rlimit import change_resource_limit
 from synapse.util.versionstring import get_version_string
 from synapse.crypto import context_factory
 
+from synapse import events
+
 
 from twisted.internet import reactor, defer
 from twisted.web.resource import Resource
@@ -165,6 +167,8 @@ def start(config_options):
 
     setup_logging(config.worker_log_config, config.worker_log_file)
 
+    events.USE_FROZEN_DICTS = config.use_frozen_dicts
+
     database_engine = create_engine(config.database_config)
 
     tls_server_context_factory = context_factory.ServerContextFactory(config)
diff --git a/synapse/app/federation_reader.py b/synapse/app/federation_reader.py
index 1f5ae1937e..b5f59a9931 100644
--- a/synapse/app/federation_reader.py
+++ b/synapse/app/federation_reader.py
@@ -39,6 +39,8 @@ from synapse.api.urls import FEDERATION_PREFIX
 from synapse.federation.transport.server import TransportLayerServer
 from synapse.crypto import context_factory
 
+from synapse import events
+
 
 from twisted.internet import reactor, defer
 from twisted.web.resource import Resource
@@ -156,6 +158,8 @@ def start(config_options):
 
     setup_logging(config.worker_log_config, config.worker_log_file)
 
+    events.USE_FROZEN_DICTS = config.use_frozen_dicts
+
     database_engine = create_engine(config.database_config)
 
     tls_server_context_factory = context_factory.ServerContextFactory(config)
diff --git a/synapse/app/media_repository.py b/synapse/app/media_repository.py
index 6e5ec01c6c..44c19a1bef 100644
--- a/synapse/app/media_repository.py
+++ b/synapse/app/media_repository.py
@@ -41,6 +41,8 @@ from synapse.api.urls import (
 )
 from synapse.crypto import context_factory
 
+from synapse import events
+
 
 from twisted.internet import reactor, defer
 from twisted.web.resource import Resource
@@ -162,6 +164,8 @@ def start(config_options):
 
     setup_logging(config.worker_log_config, config.worker_log_file)
 
+    events.USE_FROZEN_DICTS = config.use_frozen_dicts
+
     database_engine = create_engine(config.database_config)
 
     tls_server_context_factory = context_factory.ServerContextFactory(config)
diff --git a/synapse/app/pusher.py b/synapse/app/pusher.py
index 1a6f5507a9..a0e765c54f 100644
--- a/synapse/app/pusher.py
+++ b/synapse/app/pusher.py
@@ -36,6 +36,8 @@ from synapse.util.manhole import manhole
 from synapse.util.rlimit import change_resource_limit
 from synapse.util.versionstring import get_version_string
 
+from synapse import events
+
 from twisted.internet import reactor, defer
 from twisted.web.resource import Resource
 
@@ -239,6 +241,8 @@ def start(config_options):
 
     setup_logging(config.worker_log_config, config.worker_log_file)
 
+    events.USE_FROZEN_DICTS = config.use_frozen_dicts
+
     if config.start_pushers:
         sys.stderr.write(
             "\nThe pushers must be disabled in the main synapse process"
diff --git a/synapse/app/synchrotron.py b/synapse/app/synchrotron.py
index 64b209ffe6..bf1b995dc2 100644
--- a/synapse/app/synchrotron.py
+++ b/synapse/app/synchrotron.py
@@ -446,6 +446,8 @@ def start(config_options):
 
     setup_logging(config.worker_log_config, config.worker_log_file)
 
+    synapse.events.USE_FROZEN_DICTS = config.use_frozen_dicts
+
     database_engine = create_engine(config.database_config)
 
     ss = SynchrotronServer(
diff --git a/synapse/config/repository.py b/synapse/config/repository.py
index 8810079848..2c6f57168e 100644
--- a/synapse/config/repository.py
+++ b/synapse/config/repository.py
@@ -167,6 +167,8 @@ class ContentRepositoryConfig(Config):
         # - '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'
         #
         # 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.
diff --git a/synapse/handlers/auth.py b/synapse/handlers/auth.py
index 3635521230..3851b35889 100644
--- a/synapse/handlers/auth.py
+++ b/synapse/handlers/auth.py
@@ -653,7 +653,7 @@ class AuthHandler(BaseHandler):
         Returns:
             Hashed password (str).
         """
-        return bcrypt.hashpw(password + self.hs.config.password_pepper,
+        return bcrypt.hashpw(password.encode('utf8') + self.hs.config.password_pepper,
                              bcrypt.gensalt(self.bcrypt_rounds))
 
     def validate_hash(self, password, stored_hash):
diff --git a/synapse/handlers/message.py b/synapse/handlers/message.py
index abfa8c65a4..81df45177a 100644
--- a/synapse/handlers/message.py
+++ b/synapse/handlers/message.py
@@ -34,6 +34,7 @@ from ._base import BaseHandler
 from canonicaljson import encode_canonical_json
 
 import logging
+import random
 
 logger = logging.getLogger(__name__)
 
@@ -415,6 +416,20 @@ class MessageHandler(BaseHandler):
                 builder.room_id,
             )
 
+            # We want to limit the max number of prev events we point to in our
+            # new event
+            if len(latest_ret) > 10:
+                # Sort by reverse depth, so we point to the most recent.
+                latest_ret.sort(key=lambda a: -a[2])
+                new_latest_ret = latest_ret[:5]
+
+                # We also randomly point to some of the older events, to make
+                # sure that we don't completely ignore the older events.
+                if latest_ret[5:]:
+                    sample_size = min(5, len(latest_ret[5:]))
+                    new_latest_ret.extend(random.sample(latest_ret[5:], sample_size))
+                latest_ret = new_latest_ret
+
             if latest_ret:
                 depth = max([d for _, _, d in latest_ret]) + 1
             else:
diff --git a/synapse/http/server.py b/synapse/http/server.py
index 168e53ce0c..14715878c5 100644
--- a/synapse/http/server.py
+++ b/synapse/http/server.py
@@ -392,17 +392,30 @@ def respond_with_json_bytes(request, code, json_bytes, send_cors=False,
     request.setHeader(b"Content-Length", b"%d" % (len(json_bytes),))
 
     if send_cors:
-        request.setHeader("Access-Control-Allow-Origin", "*")
-        request.setHeader("Access-Control-Allow-Methods",
-                          "GET, POST, PUT, DELETE, OPTIONS")
-        request.setHeader("Access-Control-Allow-Headers",
-                          "Origin, X-Requested-With, Content-Type, Accept")
+        set_cors_headers(request)
 
     request.write(json_bytes)
     finish_request(request)
     return NOT_DONE_YET
 
 
+def set_cors_headers(request):
+    """Set the CORs headers so that javascript running in a web browsers can
+    use this API
+
+    Args:
+        request (twisted.web.http.Request): The http request to add CORs to.
+    """
+    request.setHeader("Access-Control-Allow-Origin", "*")
+    request.setHeader(
+        "Access-Control-Allow-Methods", "GET, POST, PUT, DELETE, OPTIONS"
+    )
+    request.setHeader(
+        "Access-Control-Allow-Headers",
+        "Origin, X-Requested-With, Content-Type, Accept"
+    )
+
+
 def finish_request(request):
     """ Finish writing the response to the request.
 
diff --git a/synapse/metrics/__init__.py b/synapse/metrics/__init__.py
index 7041da25ce..2265e6e8d6 100644
--- a/synapse/metrics/__init__.py
+++ b/synapse/metrics/__init__.py
@@ -111,18 +111,20 @@ def render_all():
     return "\n".join(strs)
 
 
-reactor_metrics = get_metrics_for("reactor")
-tick_time = reactor_metrics.register_distribution("tick_time")
-pending_calls_metric = reactor_metrics.register_distribution("pending_calls")
+register_process_collector(get_metrics_for("process"))
+
 
-gc_time = reactor_metrics.register_distribution("gc_time", labels=["gen"])
-gc_unreachable = reactor_metrics.register_counter("gc_unreachable", labels=["gen"])
+python_metrics = get_metrics_for("python")
 
-reactor_metrics.register_callback(
+gc_time = python_metrics.register_distribution("gc_time", labels=["gen"])
+gc_unreachable = python_metrics.register_counter("gc_unreachable_total", labels=["gen"])
+python_metrics.register_callback(
     "gc_counts", lambda: {(i,): v for i, v in enumerate(gc.get_count())}, labels=["gen"]
 )
 
-register_process_collector(get_metrics_for("process"))
+reactor_metrics = get_metrics_for("python.twisted.reactor")
+tick_time = reactor_metrics.register_distribution("tick_time")
+pending_calls_metric = reactor_metrics.register_distribution("pending_calls")
 
 
 def runUntilCurrentTimer(func):
diff --git a/synapse/metrics/process_collector.py b/synapse/metrics/process_collector.py
index 0e95582368..6fec3de399 100644
--- a/synapse/metrics/process_collector.py
+++ b/synapse/metrics/process_collector.py
@@ -13,12 +13,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-# Because otherwise 'resource' collides with synapse.metrics.resource
-from __future__ import absolute_import
-
 import os
-import stat
-from resource import getrusage, RUSAGE_SELF
 
 
 TICKS_PER_SEC = 100
@@ -29,16 +24,6 @@ HAVE_PROC_SELF_STAT = os.path.exists("/proc/self/stat")
 HAVE_PROC_SELF_LIMITS = os.path.exists("/proc/self/limits")
 HAVE_PROC_SELF_FD = os.path.exists("/proc/self/fd")
 
-TYPES = {
-    stat.S_IFSOCK: "SOCK",
-    stat.S_IFLNK: "LNK",
-    stat.S_IFREG: "REG",
-    stat.S_IFBLK: "BLK",
-    stat.S_IFDIR: "DIR",
-    stat.S_IFCHR: "CHR",
-    stat.S_IFIFO: "FIFO",
-}
-
 # Field indexes from /proc/self/stat, taken from the proc(5) manpage
 STAT_FIELDS = {
     "utime": 14,
@@ -49,9 +34,7 @@ STAT_FIELDS = {
 }
 
 
-rusage = None
 stats = {}
-fd_counts = None
 
 # In order to report process_start_time_seconds we need to know the
 # machine's boot time, because the value in /proc/self/stat is relative to
@@ -65,9 +48,6 @@ if HAVE_PROC_STAT:
 
 
 def update_resource_metrics():
-    global rusage
-    rusage = getrusage(RUSAGE_SELF)
-
     if HAVE_PROC_SELF_STAT:
         global stats
         with open("/proc/self/stat") as s:
@@ -80,52 +60,17 @@ def update_resource_metrics():
                 # we've lost the first two fields in PID and COMMAND above
                 stats[name] = int(raw_stats[index - 3])
 
-    global fd_counts
-    fd_counts = _process_fds()
-
-
-def _process_fds():
-    counts = {(k,): 0 for k in TYPES.values()}
-    counts[("other",)] = 0
 
+def _count_fds():
     # Not every OS will have a /proc/self/fd directory
     if not HAVE_PROC_SELF_FD:
-        return counts
-
-    for fd in os.listdir("/proc/self/fd"):
-        try:
-            s = os.stat("/proc/self/fd/%s" % (fd))
-            fmt = stat.S_IFMT(s.st_mode)
-            if fmt in TYPES:
-                t = TYPES[fmt]
-            else:
-                t = "other"
+        return 0
 
-            counts[(t,)] += 1
-        except OSError:
-            # the dirh itself used by listdir() is usually missing by now
-            pass
-
-    return counts
+    return len(os.listdir("/proc/self/fd"))
 
 
 def register_process_collector(process_metrics):
-    # Legacy synapse-invented metric names
-
-    resource_metrics = process_metrics.make_subspace("resource")
-
-    resource_metrics.register_collector(update_resource_metrics)
-
-    # msecs
-    resource_metrics.register_callback("utime", lambda: rusage.ru_utime * 1000)
-    resource_metrics.register_callback("stime", lambda: rusage.ru_stime * 1000)
-
-    # kilobytes
-    resource_metrics.register_callback("maxrss", lambda: rusage.ru_maxrss * 1024)
-
-    process_metrics.register_callback("fds", _process_fds, labels=["type"])
-
-    # New prometheus-standard metric names
+    process_metrics.register_collector(update_resource_metrics)
 
     if HAVE_PROC_SELF_STAT:
         process_metrics.register_callback(
@@ -158,7 +103,7 @@ def register_process_collector(process_metrics):
     if HAVE_PROC_SELF_FD:
         process_metrics.register_callback(
             "open_fds",
-            lambda: sum(fd_counts.values())
+            lambda: _count_fds()
         )
 
     if HAVE_PROC_SELF_LIMITS:
diff --git a/synapse/rest/media/v1/download_resource.py b/synapse/rest/media/v1/download_resource.py
index a45ee9483e..dfb87ffd15 100644
--- a/synapse/rest/media/v1/download_resource.py
+++ b/synapse/rest/media/v1/download_resource.py
@@ -15,7 +15,7 @@
 
 from ._base import parse_media_id, respond_with_file, respond_404
 from twisted.web.resource import Resource
-from synapse.http.server import request_handler
+from synapse.http.server import request_handler, set_cors_headers
 
 from twisted.web.server import NOT_DONE_YET
 from twisted.internet import defer
@@ -45,6 +45,7 @@ class DownloadResource(Resource):
     @request_handler()
     @defer.inlineCallbacks
     def _async_render_GET(self, request):
+        set_cors_headers(request)
         request.setHeader(
             "Content-Security-Policy",
             "default-src 'none';"
diff --git a/synapse/rest/media/v1/thumbnail_resource.py b/synapse/rest/media/v1/thumbnail_resource.py
index 0b9e1de1a7..d8f54adc99 100644
--- a/synapse/rest/media/v1/thumbnail_resource.py
+++ b/synapse/rest/media/v1/thumbnail_resource.py
@@ -17,7 +17,7 @@
 from ._base import parse_media_id, respond_404, respond_with_file
 from twisted.web.resource import Resource
 from synapse.http.servlet import parse_string, parse_integer
-from synapse.http.server import request_handler
+from synapse.http.server import request_handler, set_cors_headers
 
 from twisted.web.server import NOT_DONE_YET
 from twisted.internet import defer
@@ -48,6 +48,7 @@ class ThumbnailResource(Resource):
     @request_handler()
     @defer.inlineCallbacks
     def _async_render_GET(self, request):
+        set_cors_headers(request)
         server_name, media_id, _ = parse_media_id(request)
         width = parse_integer(request, "width")
         height = parse_integer(request, "height")
diff --git a/synapse/storage/prepare_database.py b/synapse/storage/prepare_database.py
index d2c0aebe48..6576a30098 100644
--- a/synapse/storage/prepare_database.py
+++ b/synapse/storage/prepare_database.py
@@ -25,7 +25,7 @@ logger = logging.getLogger(__name__)
 
 # Remember to update this number every time a change is made to database
 # schema files, so the users will be informed on server restarts.
-SCHEMA_VERSION = 37
+SCHEMA_VERSION = 38
 
 dir_path = os.path.abspath(os.path.dirname(__file__))
 
diff --git a/synapse/storage/pusher.py b/synapse/storage/pusher.py
index 8f5f8f24a9..8cc9f0353b 100644
--- a/synapse/storage/pusher.py
+++ b/synapse/storage/pusher.py
@@ -137,17 +137,8 @@ class PusherStore(SQLBaseStore):
 
     @cachedInlineCallbacks(num_args=1, max_entries=15000)
     def get_if_user_has_pusher(self, user_id):
-        result = yield self._simple_select_many_batch(
-            table='pushers',
-            keyvalues={
-                'user_name': 'user_id',
-            },
-            retcol='user_name',
-            desc='get_if_user_has_pusher',
-            allow_none=True,
-        )
-
-        defer.returnValue(bool(result))
+        # This only exists for the cachedList decorator
+        raise NotImplementedError()
 
     @cachedList(cached_method_name="get_if_user_has_pusher",
                 list_name="user_ids", num_args=1, inlineCallbacks=True)
diff --git a/synapse/storage/schema/delta/38/postgres_fts_gist.sql b/synapse/storage/schema/delta/38/postgres_fts_gist.sql
new file mode 100644
index 0000000000..f090a7b75a
--- /dev/null
+++ b/synapse/storage/schema/delta/38/postgres_fts_gist.sql
@@ -0,0 +1,17 @@
+/* Copyright 2016 OpenMarket Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+ INSERT into background_updates (update_name, progress_json)
+     VALUES ('event_search_postgres_gist', '{}');
diff --git a/synapse/storage/search.py b/synapse/storage/search.py
index 12941d1775..8f2b3c4435 100644
--- a/synapse/storage/search.py
+++ b/synapse/storage/search.py
@@ -31,6 +31,7 @@ class SearchStore(BackgroundUpdateStore):
 
     EVENT_SEARCH_UPDATE_NAME = "event_search"
     EVENT_SEARCH_ORDER_UPDATE_NAME = "event_search_order"
+    EVENT_SEARCH_USE_GIST_POSTGRES_NAME = "event_search_postgres_gist"
 
     def __init__(self, hs):
         super(SearchStore, self).__init__(hs)
@@ -41,6 +42,10 @@ class SearchStore(BackgroundUpdateStore):
             self.EVENT_SEARCH_ORDER_UPDATE_NAME,
             self._background_reindex_search_order
         )
+        self.register_background_update_handler(
+            self.EVENT_SEARCH_USE_GIST_POSTGRES_NAME,
+            self._background_reindex_gist_search
+        )
 
     @defer.inlineCallbacks
     def _background_reindex_search(self, progress, batch_size):
@@ -140,6 +145,28 @@ class SearchStore(BackgroundUpdateStore):
         defer.returnValue(result)
 
     @defer.inlineCallbacks
+    def _background_reindex_gist_search(self, progress, batch_size):
+        def create_index(conn):
+            conn.rollback()
+            conn.set_session(autocommit=True)
+            c = conn.cursor()
+
+            c.execute(
+                "CREATE INDEX CONCURRENTLY event_search_fts_idx_gist"
+                " ON event_search USING GIST (vector)"
+            )
+
+            c.execute("DROP INDEX event_search_fts_idx")
+
+            conn.set_session(autocommit=False)
+
+        if isinstance(self.database_engine, PostgresEngine):
+            yield self.runWithConnection(create_index)
+
+        yield self._end_background_update(self.EVENT_SEARCH_USE_GIST_POSTGRES_NAME)
+        defer.returnValue(1)
+
+    @defer.inlineCallbacks
     def _background_reindex_search_order(self, progress, batch_size):
         target_min_stream_id = progress["target_min_stream_id_inclusive"]
         max_stream_id = progress["max_stream_id_exclusive"]
diff --git a/synapse/storage/transactions.py b/synapse/storage/transactions.py
index 5055c04b24..adab520c78 100644
--- a/synapse/storage/transactions.py
+++ b/synapse/storage/transactions.py
@@ -16,13 +16,12 @@
 from ._base import SQLBaseStore
 from synapse.util.caches.descriptors import cached
 
-from twisted.internet import defer, reactor
+from twisted.internet import defer
 
 from canonicaljson import encode_canonical_json
 
 from collections import namedtuple
 
-import itertools
 import logging
 import ujson as json
 
@@ -50,20 +49,6 @@ class TransactionStore(SQLBaseStore):
     def __init__(self, hs):
         super(TransactionStore, self).__init__(hs)
 
-        # New transactions that are currently in flights
-        self.inflight_transactions = {}
-
-        # Newly delievered transactions that *weren't* persisted while in flight
-        self.new_delivered_transactions = {}
-
-        # Newly delivered transactions that *were* persisted while in flight
-        self.update_delivered_transactions = {}
-
-        self.last_transaction = {}
-
-        reactor.addSystemEventTrigger("before", "shutdown", self._persist_in_mem_txns)
-        self._clock.looping_call(self._persist_in_mem_txns, 1000)
-
         self._clock.looping_call(self._cleanup_transactions, 30 * 60 * 1000)
 
     def get_received_txn_response(self, transaction_id, origin):
@@ -148,46 +133,7 @@ class TransactionStore(SQLBaseStore):
         Returns:
             list: A list of previous transaction ids.
         """
-
-        auto_id = self._transaction_id_gen.get_next()
-
-        txn_row = _TransactionRow(
-            id=auto_id,
-            transaction_id=transaction_id,
-            destination=destination,
-            ts=origin_server_ts,
-            response_code=0,
-            response_json=None,
-        )
-
-        self.inflight_transactions.setdefault(destination, {})[transaction_id] = txn_row
-
-        prev_txn = self.last_transaction.get(destination)
-        if prev_txn:
-            return defer.succeed(prev_txn)
-        else:
-            return self.runInteraction(
-                "_get_prevs_txn",
-                self._get_prevs_txn,
-                destination,
-            )
-
-    def _get_prevs_txn(self, txn, destination):
-        # First we find out what the prev_txns should be.
-        # Since we know that we are only sending one transaction at a time,
-        # we can simply take the last one.
-        query = (
-            "SELECT * FROM sent_transactions"
-            " WHERE destination = ?"
-            " ORDER BY id DESC LIMIT 1"
-        )
-
-        txn.execute(query, (destination,))
-        results = self.cursor_to_dict(txn)
-
-        prev_txns = [r["transaction_id"] for r in results]
-
-        return prev_txns
+        return defer.succeed([])
 
     def delivered_txn(self, transaction_id, destination, code, response_dict):
         """Persists the response for an outgoing transaction.
@@ -198,52 +144,7 @@ class TransactionStore(SQLBaseStore):
             code (int)
             response_json (str)
         """
-
-        txn_row = self.inflight_transactions.get(
-            destination, {}
-        ).pop(transaction_id, None)
-
-        self.last_transaction[destination] = transaction_id
-
-        if txn_row:
-            d = self.new_delivered_transactions.setdefault(destination, {})
-            d[transaction_id] = txn_row._replace(
-                response_code=code,
-                response_json=None,  # For now, don't persist response
-            )
-        else:
-            d = self.update_delivered_transactions.setdefault(destination, {})
-            # For now, don't persist response
-            d[transaction_id] = _UpdateTransactionRow(code, None)
-
-    def get_transactions_after(self, transaction_id, destination):
-        """Get all transactions after a given local transaction_id.
-
-        Args:
-            transaction_id (str)
-            destination (str)
-
-        Returns:
-            list: A list of dicts
-        """
-        return self.runInteraction(
-            "get_transactions_after",
-            self._get_transactions_after, transaction_id, destination
-        )
-
-    def _get_transactions_after(self, txn, transaction_id, destination):
-        query = (
-            "SELECT * FROM sent_transactions"
-            " WHERE destination = ? AND id >"
-            " ("
-            " SELECT id FROM sent_transactions"
-            " WHERE transaction_id = ? AND destination = ?"
-            " )"
-        )
-
-        txn.execute(query, (destination, transaction_id, destination))
-
-        return self.cursor_to_dict(txn)
+        pass
 
     @cached(max_entries=10000)
     def get_destination_retry_timings(self, destination):
@@ -339,58 +240,11 @@ class TransactionStore(SQLBaseStore):
         txn.execute(query, (self._clock.time_msec(),))
         return self.cursor_to_dict(txn)
 
-    @defer.inlineCallbacks
-    def _persist_in_mem_txns(self):
-        try:
-            inflight = self.inflight_transactions
-            new_delivered = self.new_delivered_transactions
-            update_delivered = self.update_delivered_transactions
-
-            self.inflight_transactions = {}
-            self.new_delivered_transactions = {}
-            self.update_delivered_transactions = {}
-
-            full_rows = [
-                row._asdict()
-                for txn_map in itertools.chain(inflight.values(), new_delivered.values())
-                for row in txn_map.values()
-            ]
-
-            def f(txn):
-                if full_rows:
-                    self._simple_insert_many_txn(
-                        txn=txn,
-                        table="sent_transactions",
-                        values=full_rows
-                    )
-
-                for dest, txn_map in update_delivered.items():
-                    for txn_id, update_row in txn_map.items():
-                        self._simple_update_one_txn(
-                            txn,
-                            table="sent_transactions",
-                            keyvalues={
-                                "transaction_id": txn_id,
-                                "destination": dest,
-                            },
-                            updatevalues={
-                                "response_code": update_row.response_code,
-                                "response_json": None,  # For now, don't persist response
-                            }
-                        )
-
-            if full_rows or update_delivered:
-                yield self.runInteraction("_persist_in_mem_txns", f)
-        except:
-            logger.exception("Failed to persist transactions!")
-
     def _cleanup_transactions(self):
         now = self._clock.time_msec()
         month_ago = now - 30 * 24 * 60 * 60 * 1000
-        six_hours_ago = now - 6 * 60 * 60 * 1000
 
         def _cleanup_transactions_txn(txn):
             txn.execute("DELETE FROM received_transactions WHERE ts < ?", (month_ago,))
-            txn.execute("DELETE FROM sent_transactions WHERE ts < ?", (six_hours_ago,))
 
-        return self.runInteraction("_persist_in_mem_txns", _cleanup_transactions_txn)
+        return self.runInteraction("_cleanup_transactions", _cleanup_transactions_txn)