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https://github.com/element-hq/synapse
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Don't support limitless pagination
The pagination storage function supported not specifiying a limit on the number of events returned. This was triggered when using the search or context API with a limit of zero, which the storage function took to mean not being limited.
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1 changed files with 6 additions and 8 deletions
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@ -684,8 +684,7 @@ class StreamWorkerStore(EventsWorkerStore, SQLBaseStore):
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results to only those before
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direction(char): Either 'b' or 'f' to indicate whether we are
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paginating forwards or backwards from `from_key`.
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limit (int): The maximum number of events to return. Zero or less
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means no limit.
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limit (int): The maximum number of events to return.
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event_filter (Filter|None): If provided filters the events to
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those that match the filter.
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@ -694,6 +693,9 @@ class StreamWorkerStore(EventsWorkerStore, SQLBaseStore):
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as a list of _EventDictReturn and a token that points to the end
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of the result set.
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"""
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assert int(limit) >= 0
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# Tokens really represent positions between elements, but we use
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# the convention of pointing to the event before the gap. Hence
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# we have a bit of asymmetry when it comes to equalities.
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@ -723,18 +725,14 @@ class StreamWorkerStore(EventsWorkerStore, SQLBaseStore):
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bounds += " AND " + filter_clause
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args.extend(filter_args)
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if int(limit) > 0:
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args.append(int(limit))
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limit_str = " LIMIT ?"
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else:
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limit_str = ""
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args.append(int(limit))
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sql = (
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"SELECT event_id, topological_ordering, stream_ordering"
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" FROM events"
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" WHERE outlier = ? AND room_id = ? AND %(bounds)s"
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" ORDER BY topological_ordering %(order)s,"
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" stream_ordering %(order)s %(limit)s"
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" stream_ordering %(order)s LIMIT ?"
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) % {
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"bounds": bounds,
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"order": order,
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