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# Copyright 2021 The Matrix.org Foundation C.I.C.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import json
from contextlib import contextmanager
from typing import Generator
from twisted.enterprise.adbapi import ConnectionPool
from twisted.internet.defer import ensureDeferred
from twisted.test.proto_helpers import MemoryReactor
from synapse.api.room_versions import EventFormatVersions, RoomVersions
from synapse.logging.context import LoggingContext
from synapse.rest import admin
from synapse.rest.client import login, room
from synapse.server import HomeServer
from synapse.storage.databases.main.events_worker import (
EVENT_QUEUE_THREADS,
EventsWorkerStore,
)
from synapse.storage.types import Connection
from synapse.util import Clock
from synapse.util.async_helpers import yieldable_gather_results
from tests import unittest
class HaveSeenEventsTestCase(unittest.HomeserverTestCase):
def prepare(self, reactor, clock, hs):
self.store: EventsWorkerStore = hs.get_datastore()
# insert some test data
for rid in ("room1", "room2"):
self.get_success(
self.store.db_pool.simple_insert(
"rooms",
{"room_id": rid, "room_version": 4},
)
)
for idx, (rid, eid) in enumerate(
(
("room1", "event10"),
("room1", "event11"),
("room1", "event12"),
("room2", "event20"),
)
):
self.get_success(
self.store.db_pool.simple_insert(
"events",
{
"event_id": eid,
"room_id": rid,
"topological_ordering": idx,
"stream_ordering": idx,
"type": "test",
"processed": True,
"outlier": False,
},
)
)
self.get_success(
self.store.db_pool.simple_insert(
"event_json",
{
"event_id": eid,
"room_id": rid,
"json": json.dumps({"type": "test", "room_id": rid}),
"internal_metadata": "{}",
"format_version": 3,
},
)
)
def test_simple(self):
with LoggingContext(name="test") as ctx:
res = self.get_success(
self.store.have_seen_events("room1", ["event10", "event19"])
)
self.assertEquals(res, {"event10"})
# that should result in a single db query
self.assertEquals(ctx.get_resource_usage().db_txn_count, 1)
# a second lookup of the same events should cause no queries
with LoggingContext(name="test") as ctx:
res = self.get_success(
self.store.have_seen_events("room1", ["event10", "event19"])
)
self.assertEquals(res, {"event10"})
self.assertEquals(ctx.get_resource_usage().db_txn_count, 0)
def test_query_via_event_cache(self):
# fetch an event into the event cache
self.get_success(self.store.get_event("event10"))
# looking it up should now cause no db hits
with LoggingContext(name="test") as ctx:
res = self.get_success(self.store.have_seen_events("room1", ["event10"]))
self.assertEquals(res, {"event10"})
self.assertEquals(ctx.get_resource_usage().db_txn_count, 0)
class EventCacheTestCase(unittest.HomeserverTestCase):
"""Test that the various layers of event cache works."""
servlets = [
admin.register_servlets,
room.register_servlets,
login.register_servlets,
]
def prepare(self, reactor, clock, hs):
self.store: EventsWorkerStore = hs.get_datastore()
self.user = self.register_user("user", "pass")
self.token = self.login(self.user, "pass")
self.room = self.helper.create_room_as(self.user, tok=self.token)
res = self.helper.send(self.room, tok=self.token)
self.event_id = res["event_id"]
# Reset the event cache so the tests start with it empty
self.store._get_event_cache.clear()
def test_simple(self):
"""Test that we cache events that we pull from the DB."""
with LoggingContext("test") as ctx:
self.get_success(self.store.get_event(self.event_id))
# We should have fetched the event from the DB
self.assertEqual(ctx.get_resource_usage().evt_db_fetch_count, 1)
def test_dedupe(self):
"""Test that if we request the same event multiple times we only pull it
out once.
"""
with LoggingContext("test") as ctx:
d = yieldable_gather_results(
self.store.get_event, [self.event_id, self.event_id]
)
self.get_success(d)
# We should have fetched the event from the DB
self.assertEqual(ctx.get_resource_usage().evt_db_fetch_count, 1)
class DatabaseOutageTestCase(unittest.HomeserverTestCase):
"""Test event fetching during a database outage."""
def prepare(self, reactor: MemoryReactor, clock: Clock, hs: HomeServer):
self.store: EventsWorkerStore = hs.get_datastore()
self.room_id = f"!room:{hs.hostname}"
self.event_ids = [f"event{i}" for i in range(20)]
self._populate_events()
def _populate_events(self) -> None:
"""Ensure that there are test events in the database.
When testing with the in-memory SQLite database, all the events are lost during
the simulated outage.
To ensure consistency between `room_id`s and `event_id`s before and after the
outage, rows are built and inserted manually.
Upserts are used to handle the non-SQLite case where events are not lost.
"""
self.get_success(
self.store.db_pool.simple_upsert(
"rooms",
{"room_id": self.room_id},
{"room_version": RoomVersions.V4.identifier},
)
)
self.event_ids = [f"event{i}" for i in range(20)]
for idx, event_id in enumerate(self.event_ids):
self.get_success(
self.store.db_pool.simple_upsert(
"events",
{"event_id": event_id},
{
"event_id": event_id,
"room_id": self.room_id,
"topological_ordering": idx,
"stream_ordering": idx,
"type": "test",
"processed": True,
"outlier": False,
},
)
)
self.get_success(
self.store.db_pool.simple_upsert(
"event_json",
{"event_id": event_id},
{
"room_id": self.room_id,
"json": json.dumps({"type": "test", "room_id": self.room_id}),
"internal_metadata": "{}",
"format_version": EventFormatVersions.V3,
},
)
)
@contextmanager
def _outage(self) -> Generator[None, None, None]:
"""Simulate a database outage.
Returns:
A context manager. While the context is active, any attempts to connect to
the database will fail.
"""
connection_pool = self.store.db_pool._db_pool
# Close all connections and shut down the database `ThreadPool`.
connection_pool.close()
# Restart the database `ThreadPool`.
connection_pool.start()
original_connection_factory = connection_pool.connectionFactory
def connection_factory(_pool: ConnectionPool) -> Connection:
raise Exception("Could not connect to the database.")
connection_pool.connectionFactory = connection_factory # type: ignore[assignment]
try:
yield
finally:
connection_pool.connectionFactory = original_connection_factory
# If the in-memory SQLite database is being used, all the events are gone.
# Restore the test data.
self._populate_events()
def test_failure(self) -> None:
"""Test that event fetches do not get stuck during a database outage."""
with self._outage():
failure = self.get_failure(
self.store.get_event(self.event_ids[0]), Exception
)
self.assertEqual(str(failure.value), "Could not connect to the database.")
def test_recovery(self) -> None:
"""Test that event fetchers recover after a database outage."""
with self._outage():
# Kick off a bunch of event fetches but do not pump the reactor
event_deferreds = []
for event_id in self.event_ids:
event_deferreds.append(ensureDeferred(self.store.get_event(event_id)))
# We should have maxed out on event fetcher threads
self.assertEqual(self.store._event_fetch_ongoing, EVENT_QUEUE_THREADS)
# All the event fetchers will fail
self.pump()
self.assertEqual(self.store._event_fetch_ongoing, 0)
for event_deferred in event_deferreds:
failure = self.get_failure(event_deferred, Exception)
self.assertEqual(
str(failure.value), "Could not connect to the database."
)
# This next event fetch should succeed
self.get_success(self.store.get_event(self.event_ids[0]))
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