MatrixSynapse/synapse/util/caches
Jonathan de Jong f5c93fc993
Fix #8518 (sync requests being cached wrongly on timeout) (#9358)
This fixes #8518 by adding a conditional check on `SyncResult` in a function when `prev_stream_token == current_stream_token`, as a sanity check. In `CachedResponse.set.<remove>()`, the result is immediately popped from the cache if the conditional function returns "false".

This prevents the caching of a timed-out `SyncResult` (that has `next_key` as the stream key that produced that `SyncResult`). The cache is prevented from returning a `SyncResult` that makes the client request the same stream key over and over again, effectively making it stuck in a loop of requesting and getting a response immediately for as long as the cache keeps those values.

Signed-off-by: Jonathan de Jong <jonathan@automatia.nl>
2021-02-24 13:57:00 +00:00
..
__init__.py
cached_call.py
deferred_cache.py
descriptors.py
dictionary_cache.py
expiringcache.py
lrucache.py
response_cache.py Fix #8518 (sync requests being cached wrongly on timeout) (#9358) 2021-02-24 13:57:00 +00:00
stream_change_cache.py
treecache.py
ttlcache.py