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Merge pull request #1620 from matrix-org/erikj/concurrent_room_access
Limit the number of events that can be created on a given room concurrently
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commit
d53a80af25
@ -24,7 +24,7 @@ from synapse.push.action_generator import ActionGenerator
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from synapse.types import (
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UserID, RoomAlias, RoomStreamToken,
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)
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from synapse.util.async import run_on_reactor, ReadWriteLock
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from synapse.util.async import run_on_reactor, ReadWriteLock, Limiter
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from synapse.util.logcontext import preserve_fn
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from synapse.util.metrics import measure_func
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from synapse.visibility import filter_events_for_client
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@ -50,6 +50,10 @@ class MessageHandler(BaseHandler):
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self.pagination_lock = ReadWriteLock()
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# We arbitrarily limit concurrent event creation for a room to 5.
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# This is to stop us from diverging history *too* much.
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self.limiter = Limiter(max_count=5)
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@defer.inlineCallbacks
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def purge_history(self, room_id, event_id):
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event = yield self.store.get_event(event_id)
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@ -191,36 +195,38 @@ class MessageHandler(BaseHandler):
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"""
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builder = self.event_builder_factory.new(event_dict)
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self.validator.validate_new(builder)
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with (yield self.limiter.queue(builder.room_id)):
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self.validator.validate_new(builder)
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if builder.type == EventTypes.Member:
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membership = builder.content.get("membership", None)
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target = UserID.from_string(builder.state_key)
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if builder.type == EventTypes.Member:
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membership = builder.content.get("membership", None)
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target = UserID.from_string(builder.state_key)
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if membership in {Membership.JOIN, Membership.INVITE}:
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# If event doesn't include a display name, add one.
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profile = self.hs.get_handlers().profile_handler
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content = builder.content
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if membership in {Membership.JOIN, Membership.INVITE}:
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# If event doesn't include a display name, add one.
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profile = self.hs.get_handlers().profile_handler
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content = builder.content
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try:
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content["displayname"] = yield profile.get_displayname(target)
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content["avatar_url"] = yield profile.get_avatar_url(target)
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except Exception as e:
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logger.info(
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"Failed to get profile information for %r: %s",
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target, e
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)
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try:
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content["displayname"] = yield profile.get_displayname(target)
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content["avatar_url"] = yield profile.get_avatar_url(target)
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except Exception as e:
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logger.info(
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"Failed to get profile information for %r: %s",
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target, e
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)
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if token_id is not None:
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builder.internal_metadata.token_id = token_id
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if token_id is not None:
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builder.internal_metadata.token_id = token_id
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if txn_id is not None:
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builder.internal_metadata.txn_id = txn_id
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if txn_id is not None:
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builder.internal_metadata.txn_id = txn_id
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event, context = yield self._create_new_client_event(
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builder=builder,
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prev_event_ids=prev_event_ids,
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)
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event, context = yield self._create_new_client_event(
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builder=builder,
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prev_event_ids=prev_event_ids,
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)
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defer.returnValue((event, context))
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@defer.inlineCallbacks
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@ -197,6 +197,64 @@ class Linearizer(object):
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defer.returnValue(_ctx_manager())
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class Limiter(object):
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"""Limits concurrent access to resources based on a key. Useful to ensure
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only a few thing happen at a time on a given resource.
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Example:
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with (yield limiter.queue("test_key")):
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# do some work.
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"""
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def __init__(self, max_count):
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"""
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Args:
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max_count(int): The maximum number of concurrent access
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"""
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self.max_count = max_count
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# key_to_defer is a map from the key to a 2 element list where
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# the first element is the number of things executing
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# the second element is a list of deferreds for the things blocked from
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# executing.
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self.key_to_defer = {}
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@defer.inlineCallbacks
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def queue(self, key):
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entry = self.key_to_defer.setdefault(key, [0, []])
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# If the number of things executing is greater than the maximum
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# then add a deferred to the list of blocked items
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# When on of the things currently executing finishes it will callback
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# this item so that it can continue executing.
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if entry[0] >= self.max_count:
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new_defer = defer.Deferred()
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entry[1].append(new_defer)
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with PreserveLoggingContext():
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yield new_defer
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entry[0] += 1
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@contextmanager
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def _ctx_manager():
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try:
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yield
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finally:
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# We've finished executing so check if there are any things
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# blocked waiting to execute and start one of them
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entry[0] -= 1
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try:
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entry[1].pop(0).callback(None)
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except IndexError:
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# If nothing else is executing for this key then remove it
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# from the map
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if entry[0] == 0:
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self.key_to_defer.pop(key, None)
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defer.returnValue(_ctx_manager())
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class ReadWriteLock(object):
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"""A deferred style read write lock.
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70
tests/util/test_limiter.py
Normal file
70
tests/util/test_limiter.py
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@ -0,0 +1,70 @@
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# -*- coding: utf-8 -*-
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# Copyright 2016 OpenMarket Ltd
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from tests import unittest
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from twisted.internet import defer
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from synapse.util.async import Limiter
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class LimiterTestCase(unittest.TestCase):
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@defer.inlineCallbacks
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def test_limiter(self):
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limiter = Limiter(3)
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key = object()
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d1 = limiter.queue(key)
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cm1 = yield d1
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d2 = limiter.queue(key)
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cm2 = yield d2
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d3 = limiter.queue(key)
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cm3 = yield d3
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d4 = limiter.queue(key)
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self.assertFalse(d4.called)
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d5 = limiter.queue(key)
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self.assertFalse(d5.called)
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with cm1:
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self.assertFalse(d4.called)
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self.assertFalse(d5.called)
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self.assertTrue(d4.called)
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self.assertFalse(d5.called)
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with cm3:
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self.assertFalse(d5.called)
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self.assertTrue(d5.called)
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with cm2:
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pass
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with (yield d4):
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pass
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with (yield d5):
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pass
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d6 = limiter.queue(key)
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with (yield d6):
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pass
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