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https://github.com/element-hq/synapse
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Add find_first_stream_ordering_after_ts
Expose this as a public function which can be called outside a txn
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1 changed files with 21 additions and 0 deletions
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@ -489,6 +489,27 @@ class EventPushActionsWorkerStore(SQLBaseStore):
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self.stream_ordering_day_ago
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)
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def find_first_stream_ordering_after_ts(self, ts):
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"""Gets the stream ordering corresponding to a given timestamp.
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Specifically, finds the stream_ordering of the first event that was
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received after the timestamp. This is done by a binary search on the
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events table, since there is no index on received_ts, so is
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relatively slow.
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Args:
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ts (int): timestamp in millis
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Returns:
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Deferred[int]: stream ordering of the first event received after
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the timestamp
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"""
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return self.runInteraction(
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"_find_first_stream_ordering_after_ts_txn",
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self._find_first_stream_ordering_after_ts_txn,
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ts,
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)
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def _find_first_stream_ordering_after_ts_txn(self, txn, ts):
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"""
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Find the stream_ordering of the first event that was received after
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