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Make get_current_token accept a direction parameter, which tells whether the source whether we want a token for going 'forwards' or 'backwards'

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Erik Johnston 2015-05-12 10:28:10 +01:00
parent 84e6b4001f
commit 4df11b5039
4 changed files with 26 additions and 8 deletions
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20
synapse/storage/stream.py
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@ -364,9 +364,25 @@ class StreamStore(SQLBaseStore):
)
@defer.inlineCallbacks
def get_room_events_max_id(self):
def get_room_events_max_id(self, direction='f'):
token = yield self._stream_id_gen.get_max_token(self)
defer.returnValue("s%d" % (token,))
if direction != 'b':
defer.returnValue("s%d" % (token,))
else:
topo = yield self.runInteraction(
"_get_max_topological_txn", self._get_max_topological_txn
)
defer.returnValue("t%d-%d" % (topo, token))
def _get_max_topological_txn(self, txn):
txn.execute(
"SELECT MAX(topological_ordering) FROM events"
" WHERE outlier = ?",
(False,)
)
rows = txn.fetchall()
return rows[0][0] if rows else 0
@defer.inlineCallbacks
def _get_min_token(self):