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Use 'is not None' and add comments

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This commit is contained in:
Erik Johnston 2018-07-10 18:12:39 +01:00
parent bb3d536087
commit 6ccefef07a
1 changed files with 6 additions and 2 deletions
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8
synapse/storage/receipts.py
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@ -140,7 +140,9 @@ class ReceiptsWorkerStore(SQLBaseStore):
"""
room_ids = set(room_ids)
if from_key:
if from_key is not None:
# Only ask the database about rooms where there have been new
# receipts added since `from_key`
room_ids = yield self._receipts_stream_cache.get_entities_changed(
room_ids, from_key
)
@ -163,7 +165,9 @@ class ReceiptsWorkerStore(SQLBaseStore):
Returns:
list: A list of receipts.
"""
if from_key:
if from_key is not None:
# Check the cache first to see if any new receipts have been added
# since`from_key`. If not we can no-op.
if not self._receipts_stream_cache.has_entity_changed(room_id, from_key):
defer.succeed([])