Deduplicate identical /sync requests
parent
31e6f8636f
commit
191c7bef6b
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@ -20,6 +20,7 @@ from synapse.api.constants import Membership, EventTypes
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from synapse.util import unwrapFirstError
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from synapse.util.logcontext import LoggingContext, preserve_fn
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from synapse.util.metrics import Measure
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from synapse.util.caches.response_cache import ResponseCache
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from synapse.push.clientformat import format_push_rules_for_user
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from twisted.internet import defer
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@ -35,6 +36,7 @@ SyncConfig = collections.namedtuple("SyncConfig", [
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"user",
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"filter_collection",
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"is_guest",
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"request_key",
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])
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@ -136,8 +138,8 @@ class SyncHandler(BaseHandler):
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super(SyncHandler, self).__init__(hs)
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self.event_sources = hs.get_event_sources()
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self.clock = hs.get_clock()
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self.response_cache = ResponseCache()
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@defer.inlineCallbacks
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def wait_for_sync_for_user(self, sync_config, since_token=None, timeout=0,
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full_state=False):
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"""Get the sync for a client if we have new data for it now. Otherwise
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@ -146,7 +148,19 @@ class SyncHandler(BaseHandler):
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Returns:
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A Deferred SyncResult.
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"""
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result = self.response_cache.get(sync_config.request_key)
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if not result:
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result = self.response_cache.set(
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sync_config.request_key,
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self._wait_for_sync_for_user(
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sync_config, since_token, timeout, full_state
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)
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)
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return result
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@defer.inlineCallbacks
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def _wait_for_sync_for_user(self, sync_config, since_token, timeout,
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full_state):
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context = LoggingContext.current_context()
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if context:
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if since_token is None:
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@ -115,6 +115,8 @@ class SyncRestServlet(RestServlet):
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)
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)
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request_key = (user, timeout, since, filter_id, full_state)
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if filter_id:
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if filter_id.startswith('{'):
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try:
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@ -134,6 +136,7 @@ class SyncRestServlet(RestServlet):
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user=user,
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filter_collection=filter,
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is_guest=requester.is_guest,
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request_key=request_key,
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)
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if since is not None:
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@ -0,0 +1,46 @@
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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 synapse.util.async import ObservableDeferred
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class ResponseCache(object):
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"""
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This caches a deferred response. Until the deferred completes it will be
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returned from the cache. This means that if the client retries the request
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while the response is still being computed, that original response will be
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used rather than trying to compute a new response.
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"""
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def __init__(self):
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self.pending_result_cache = {} # Request that haven't finished yet.
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def get(self, key):
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result = self.pending_result_cache.get(key)
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if result is not None:
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return result.observe()
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else:
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return None
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def set(self, key, deferred):
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result = ObservableDeferred(deferred)
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self.pending_result_cache[key] = result
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def remove(r):
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self.pending_result_cache.pop(key, None)
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return r
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result.addBoth(remove)
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return result.observe()
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