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Doc get_next() context manager usage

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This commit is contained in:
Erik Johnston 2016-08-15 13:45:26 +01:00
parent d9664344ec
commit 89e786bd85
1 changed files with 4 additions and 0 deletions
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4
synapse/storage/_base.py
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@ -873,6 +873,10 @@ class SQLBaseStore(object):
txn.call_after(cache_func.invalidate, keys)
if isinstance(self.database_engine, PostgresEngine):
# get_next() returns a context manager which is designed to wrap
# the transaction. However, we want to only get an ID when we want
# to use it, here, so we need to call __enter__ manually, and have
# __exit__ called after the transaction finishes.
ctx = self._cache_id_gen.get_next()
stream_id = ctx.__enter__()
txn.call_after(ctx.__exit__, None, None, None)