diff options
Diffstat (limited to 'synapse/storage/util/id_generators.py')
| -rw-r--r-- | synapse/storage/util/id_generators.py | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/synapse/storage/util/id_generators.py b/synapse/storage/util/id_generators.py index 2dfe4c0b66..0d7108f01b 100644 --- a/synapse/storage/util/id_generators.py +++ b/synapse/storage/util/id_generators.py @@ -186,11 +186,13 @@ class StreamIdGenerator(AbstractStreamIdGenerator): column: str, extra_tables: Iterable[Tuple[str, str]] = (), step: int = 1, + is_writer: bool = True, ) -> None: assert step != 0 self._lock = threading.Lock() self._step: int = step self._current: int = _load_current_id(db_conn, table, column, step) + self._is_writer = is_writer for table, column in extra_tables: self._current = (max if step > 0 else min)( self._current, _load_current_id(db_conn, table, column, step) @@ -204,9 +206,11 @@ class StreamIdGenerator(AbstractStreamIdGenerator): self._unfinished_ids: OrderedDict[int, int] = OrderedDict() def advance(self, instance_name: str, new_id: int) -> None: - # `StreamIdGenerator` should only be used when there is a single writer, - # so replication should never happen. - raise Exception("Replication is not supported by StreamIdGenerator") + # Advance should never be called on a writer instance, only over replication + if self._is_writer: + raise Exception("Replication is not supported by writer StreamIdGenerator") + + self._current = (max if self._step > 0 else min)(self._current, new_id) def get_next(self) -> AsyncContextManager[int]: with self._lock: @@ -249,6 +253,9 @@ class StreamIdGenerator(AbstractStreamIdGenerator): return _AsyncCtxManagerWrapper(manager()) def get_current_token(self) -> int: + if not self._is_writer: + return self._current + with self._lock: if self._unfinished_ids: return next(iter(self._unfinished_ids)) - self._step |