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authorKegan Dougal <kegan@matrix.org>2016-11-10 14:49:26 +0000
committerKegan Dougal <kegan@matrix.org>2016-11-10 14:49:26 +0000
commit2771447c29402e1f26bb45bdb730bdd0fe02682f (patch)
tree76efee1716361d704b6c00d8e359cd30deaac830 /UPGRADE.rst
parentMerge pull request #1619 from matrix-org/erikj/pwd_provider_error (diff)
downloadsynapse-2771447c29402e1f26bb45bdb730bdd0fe02682f.tar.xz
Store Promise<Response> instead of Response for HTTP API transactions
This fixes a race whereby:
 - User hits an endpoint.
 - No cached transaction so executes main code.
 - User hits same endpoint.
 - No cache transaction so executes main code.
 - Main code finishes executing and caches response and returns.
 - Main code finishes executing and caches response and returns.

 This race is common in the wild when Synapse is struggling under load.
 This commit fixes the race by:
  - User hits an endpoint.
  - Caches the promise to execute the main code and executes main code.
  - User hits same endpoint.
  - Yields on the same promise as the first request.
  - Main code finishes executing and returns, unblocking both requests.
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