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Skip serializing /sync response if client has disconnected (#7927)

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... it's a load of work which may be entirely redundant.
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Richard van der Hoff 2020-07-22 13:44:16 +01:00 committed by GitHub
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commit 923c995023
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changelog.d/7927.misc Normal file
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@ -0,0 +1 @@
Optimisation to /sync handling: skip serializing the response if the client has already disconnected.

6
synapse/rest/client/v2_alpha/sync.py
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@ -178,6 +178,12 @@ class SyncRestServlet(RestServlet):
full_state=full_state,
)
# the client may have disconnected by now; don't bother to serialize the
# response if so.
if request._disconnected:
logger.info("Client has disconnected; not serializing response.")
return 200, {}
time_now = self.clock.time_msec()
response_content = await self.encode_response(
time_now, sync_result, requester.access_token_id, filter_collection