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Doc get_next() context manager usage
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@ -873,6 +873,10 @@ class SQLBaseStore(object):
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txn.call_after(cache_func.invalidate, keys)
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if isinstance(self.database_engine, PostgresEngine):
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# get_next() returns a context manager which is designed to wrap
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# the transaction. However, we want to only get an ID when we want
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# to use it, here, so we need to call __enter__ manually, and have
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# __exit__ called after the transaction finishes.
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ctx = self._cache_id_gen.get_next()
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stream_id = ctx.__enter__()
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txn.call_after(ctx.__exit__, None, None, None)
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