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Merge pull request #2269 from matrix-org/erikj/cache_state_delta

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Cache state deltas
This commit is contained in:
Erik Johnston 2017-06-09 18:32:04 +01:00 committed by GitHub
commit f540b494a4
2 changed files with 16 additions and 4 deletions
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2
synapse/replication/slave/storage/events.py
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@ -108,7 +108,7 @@ class SlavedEventStore(BaseSlavedStore):
get_current_state_ids = (
StateStore.__dict__["get_current_state_ids"]
)
get_state_group_delta = DataStore.get_state_group_delta.__func__
get_state_group_delta = StateStore.__dict__["get_state_group_delta"]
_get_joined_hosts_cache = RoomMemberStore.__dict__["_get_joined_hosts_cache"]
has_room_changed_since = DataStore.has_room_changed_since.__func__

18
synapse/storage/state.py
View file

@ -20,6 +20,7 @@ from synapse.util.stringutils import to_ascii
from synapse.storage.engines import PostgresEngine
from twisted.internet import defer
from collections import namedtuple
import logging
@ -29,6 +30,16 @@ logger = logging.getLogger(__name__)
MAX_STATE_DELTA_HOPS = 100
class _GetStateGroupDelta(namedtuple("_GetStateGroupDelta", ("prev_group", "delta_ids"))):
"""Return type of get_state_group_delta that implements __len__, which lets
us use the itrable flag when caching
"""
__slots__ = []
def __len__(self):
return len(self.delta_ids) if self.delta_ids else 0
class StateStore(SQLBaseStore):
""" Keeps track of the state at a given event.
@ -98,6 +109,7 @@ class StateStore(SQLBaseStore):
_get_current_state_ids_txn,
)
@cached(max_entries=10000, iterable=True)
def get_state_group_delta(self, state_group):
"""Given a state group try to return a previous group and a delta between
the old and the new.
@ -117,7 +129,7 @@ class StateStore(SQLBaseStore):
)
if not prev_group:
return None, None
return _GetStateGroupDelta(None, None)
delta_ids = self._simple_select_list_txn(
txn,
@ -128,10 +140,10 @@ class StateStore(SQLBaseStore):
retcols=("type", "state_key", "event_id",)
)
return prev_group, {
return _GetStateGroupDelta(prev_group, {
(row["type"], row["state_key"]): row["event_id"]
for row in delta_ids
}
})
return self.runInteraction(
"get_state_group_delta",
_get_state_group_delta_txn,