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Cache state deltas

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This commit is contained in:
Erik Johnston 2017-06-09 16:24:00 +01:00
parent 1e9b4d5a95
commit e54d7d536e
1 changed files with 12 additions and 3 deletions
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15
synapse/storage/state.py
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@ -20,6 +20,7 @@ from synapse.util.stringutils import to_ascii
from synapse.storage.engines import PostgresEngine from synapse.storage.engines import PostgresEngine
from twisted.internet import defer from twisted.internet import defer
from collections import namedtuple
import logging import logging
@ -29,6 +30,13 @@ logger = logging.getLogger(__name__)
MAX_STATE_DELTA_HOPS = 100 MAX_STATE_DELTA_HOPS = 100
class _GetStateGroupDelta(namedtuple("_GetStateGroupDelta", ("prev_group", "delta_ids"))):
__slots__ = []
def __len__(self):
return len(self.delta_ids) if self.delta_ids else None
class StateStore(SQLBaseStore): class StateStore(SQLBaseStore):
""" Keeps track of the state at a given event. """ Keeps track of the state at a given event.
@ -98,6 +106,7 @@ class StateStore(SQLBaseStore):
_get_current_state_ids_txn, _get_current_state_ids_txn,
) )
@cached(max_entries=10000, iterable=True)
def get_state_group_delta(self, state_group): def get_state_group_delta(self, state_group):
"""Given a state group try to return a previous group and a delta between """Given a state group try to return a previous group and a delta between
the old and the new. the old and the new.
@ -117,7 +126,7 @@ class StateStore(SQLBaseStore):
) )
if not prev_group: if not prev_group:
return None, None return _GetStateGroupDelta(None, None)
delta_ids = self._simple_select_list_txn( delta_ids = self._simple_select_list_txn(
txn, txn,
@ -128,10 +137,10 @@ class StateStore(SQLBaseStore):
retcols=("type", "state_key", "event_id",) retcols=("type", "state_key", "event_id",)
) )
return prev_group, { return _GetStateGroupDelta(prev_group, {
(row["type"], row["state_key"]): row["event_id"] (row["type"], row["state_key"]): row["event_id"]
for row in delta_ids for row in delta_ids
} })
return self.runInteraction( return self.runInteraction(
"get_state_group_delta", "get_state_group_delta",
_get_state_group_delta_txn, _get_state_group_delta_txn,