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Improve exception handling in persist_event
1. use `deferred.errback()` instead of `deferred.errback(e)`, which means that a Failure object will be constructed using the current exception state, *including* its stack trace - so the stack trace is saved in the Failure, leading to better exception reports. 2. Set `consumeErrors=True` on the ObservableDeferred, because we know that there will always be at least one observer - which avoids a spurious "CRITICAL: unhandled exception in Deferred" error in the logs
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@ -110,7 +110,7 @@ class _EventPeristenceQueue(object):
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end_item.events_and_contexts.extend(events_and_contexts)
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return end_item.deferred.observe()
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deferred = ObservableDeferred(defer.Deferred())
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deferred = ObservableDeferred(defer.Deferred(), consumeErrors=True)
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queue.append(self._EventPersistQueueItem(
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events_and_contexts=events_and_contexts,
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@ -152,8 +152,8 @@ class _EventPeristenceQueue(object):
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try:
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ret = yield per_item_callback(item)
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item.deferred.callback(ret)
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except Exception as e:
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item.deferred.errback(e)
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except Exception:
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item.deferred.errback()
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finally:
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queue = self._event_persist_queues.pop(room_id, None)
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if queue:
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