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Make sync response cache time configurable. (#10513)
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changelog.d/10513.feature
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changelog.d/10513.feature
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Add a configuration setting for the time a `/sync` response is cached for.
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@ -711,6 +711,15 @@ caches:
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#
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#expiry_time: 30m
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# Controls how long the results of a /sync request are cached for after
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# a successful response is returned. A higher duration can help clients with
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# intermittent connections, at the cost of higher memory usage.
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#
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# By default, this is zero, which means that sync responses are not cached
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# at all.
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#
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#sync_response_cache_duration: 2m
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## Database ##
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@ -151,6 +151,15 @@ class CacheConfig(Config):
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# entries are never evicted based on time.
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#
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#expiry_time: 30m
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# Controls how long the results of a /sync request are cached for after
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# a successful response is returned. A higher duration can help clients with
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# intermittent connections, at the cost of higher memory usage.
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#
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# By default, this is zero, which means that sync responses are not cached
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# at all.
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#
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#sync_response_cache_duration: 2m
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"""
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def read_config(self, config, **kwargs):
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@ -212,6 +221,10 @@ class CacheConfig(Config):
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else:
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self.expiry_time_msec = None
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self.sync_response_cache_duration = self.parse_duration(
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cache_config.get("sync_response_cache_duration", 0)
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)
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# Resize all caches (if necessary) with the new factors we've loaded
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self.resize_all_caches()
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@ -269,14 +269,22 @@ class SyncHandler:
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self.presence_handler = hs.get_presence_handler()
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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[SyncRequestKey] = ResponseCache(
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hs.get_clock(), "sync"
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)
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self.state = hs.get_state_handler()
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self.auth = hs.get_auth()
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self.storage = hs.get_storage()
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self.state_store = self.storage.state
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# TODO: flush cache entries on subsequent sync request.
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# Once we get the next /sync request (ie, one with the same access token
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# that sets 'since' to 'next_batch'), we know that device won't need a
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# cached result any more, and we could flush the entry from the cache to save
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# memory.
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self.response_cache: ResponseCache[SyncRequestKey] = ResponseCache(
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hs.get_clock(),
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"sync",
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timeout_ms=hs.config.caches.sync_response_cache_duration,
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)
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# ExpiringCache((User, Device)) -> LruCache(user_id => event_id)
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self.lazy_loaded_members_cache: ExpiringCache[
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Tuple[str, Optional[str]], LruCache[str, str]
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