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Separate get_current_token into two. (#8113)

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The function is used for two purposes: 1) for subscribers of streams to
get a token they can use to get further updates with, and 2) for
replication to track position of the writers of the stream.

For streams with a single writer the two scenarios produce the same
result, however the situation becomes complicated for streams with
multiple writers. The current `MultiWriterIdGenerator` does not
correctly handle the first case (which is not an issue as its only used
for the `caches` stream which nothing subscribes to outside of
replication).
This commit is contained in:
Erik Johnston 2020-08-19 10:39:31 +01:00 • committed by GitHub
parent f40645e60b
commit 76d21d14a0
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6 changed files with 47 additions and 20 deletions
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synapse/storage/databases/main/cache.py
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@ -299,8 +299,8 @@ class CacheInvalidationWorkerStore(SQLBaseStore):
},
)
def get_cache_stream_token(self, instance_name):
def get_cache_stream_token_for_writer(self, instance_name: str) -> int:
if self._cache_id_gen:
return self._cache_id_gen.get_current_token(instance_name)
return self._cache_id_gen.get_current_token_for_writer(instance_name)
else:
return 0