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Reintroduce #14376, with bugfix for monoliths (#14468)

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* Add tests for StreamIdGenerator

* Drive-by: annotate all defs

* Revert "Revert "Remove slaved id tracker (#14376)" (#14463)"

This reverts commit d63814fd73, which in
turn reverted 36097e88c4. This restores
the latter.

* Fix StreamIdGenerator not handling unpersisted IDs

Spotted by @erikjohnston.

Closes #14456.

* Changelog

Co-authored-by: Nick Mills-Barrett <nick@fizzadar.com>
Co-authored-by: Erik Johnston <erik@matrix.org>
This commit is contained in:
David Robertson 2022-11-16 22:16:46 +00:00 • committed by GitHub
parent c15e9a0edb
commit 115f0eb233
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GPG key ID: 4AEE18F83AFDEB23
14 changed files with 230 additions and 186 deletions
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13
synapse/storage/util/id_generators.py
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@ -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