Merge pull request #662 from matrix-org/erikj/state_cache
Make StateHandler._state_cache only store event_ids.pull/667/head
Erik Johnston
commit
0e7363e0b3
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@ -28,6 +28,7 @@ from collections import namedtuple
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import logging
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import hashlib
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import os
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logger = logging.getLogger(__name__)
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@ -35,8 +36,11 @@ logger = logging.getLogger(__name__)
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KeyStateTuple = namedtuple("KeyStateTuple", ("context", "type", "state_key"))
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SIZE_OF_CACHE = 1000
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EVICTION_TIMEOUT_SECONDS = 20
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CACHE_SIZE_FACTOR = float(os.environ.get("SYNAPSE_CACHE_FACTOR", 0.1))
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SIZE_OF_CACHE = int(1000 * CACHE_SIZE_FACTOR)
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EVICTION_TIMEOUT_SECONDS = 60 * 60
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class _StateCacheEntry(object):
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@ -86,16 +90,8 @@ class StateHandler(object):
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"""
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event_ids = yield self.store.get_latest_event_ids_in_room(room_id)
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cache = None
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if self._state_cache is not None:
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cache = self._state_cache.get(frozenset(event_ids), None)
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if cache:
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cache.ts = self.clock.time_msec()
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state = cache.state
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else:
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res = yield self.resolve_state_groups(room_id, event_ids)
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state = res[1]
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res = yield self.resolve_state_groups(room_id, event_ids)
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state = res[1]
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if event_type:
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defer.returnValue(state.get((event_type, state_key)))
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@ -187,20 +183,6 @@ class StateHandler(object):
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"""
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logger.debug("resolve_state_groups event_ids %s", event_ids)
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if self._state_cache is not None:
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cache = self._state_cache.get(frozenset(event_ids), None)
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if cache and cache.state_group:
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cache.ts = self.clock.time_msec()
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prev_state = cache.state.get((event_type, state_key), None)
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if prev_state:
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prev_state = prev_state.event_id
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prev_states = [prev_state]
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else:
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prev_states = []
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defer.returnValue(
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(cache.state_group, cache.state, prev_states)
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)
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state_groups = yield self.store.get_state_groups(
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room_id, event_ids
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)
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@ -210,7 +192,7 @@ class StateHandler(object):
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state_groups.keys()
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)
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group_names = set(state_groups.keys())
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group_names = frozenset(state_groups.keys())
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if len(group_names) == 1:
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name, state_list = state_groups.items().pop()
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state = {
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@ -224,29 +206,38 @@ class StateHandler(object):
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else:
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prev_states = []
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if self._state_cache is not None:
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cache = _StateCacheEntry(
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state=state,
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state_group=name,
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ts=self.clock.time_msec()
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)
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self._state_cache[frozenset(event_ids)] = cache
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defer.returnValue((name, state, prev_states))
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if self._state_cache is not None:
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cache = self._state_cache.get(group_names, None)
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if cache and cache.state_group:
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cache.ts = self.clock.time_msec()
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event_dict = yield self.store.get_events(cache.state.values())
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state = {(e.type, e.state_key): e for e in event_dict.values()}
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prev_state = state.get((event_type, state_key), None)
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if prev_state:
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prev_state = prev_state.event_id
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prev_states = [prev_state]
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else:
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prev_states = []
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defer.returnValue(
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(cache.state_group, state, prev_states)
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)
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new_state, prev_states = self._resolve_events(
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state_groups.values(), event_type, state_key
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)
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if self._state_cache is not None:
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cache = _StateCacheEntry(
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state=new_state,
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state={key: event.event_id for key, event in new_state.items()},
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state_group=None,
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ts=self.clock.time_msec()
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)
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self._state_cache[frozenset(event_ids)] = cache
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self._state_cache[group_names] = cache
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defer.returnValue((None, new_state, prev_states))
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@ -151,6 +151,31 @@ class EventsStore(SQLBaseStore):
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defer.returnValue(events[0] if events else None)
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@defer.inlineCallbacks
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def get_events(self, event_ids, check_redacted=True,
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get_prev_content=False, allow_rejected=False):
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"""Get events from the database
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Args:
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event_ids (list): The event_ids of the events to fetch
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check_redacted (bool): If True, check if event has been redacted
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and redact it.
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get_prev_content (bool): If True and event is a state event,
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include the previous states content in the unsigned field.
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allow_rejected (bool): If True return rejected events.
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Returns:
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Deferred : Dict from event_id to event.
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"""
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events = yield self._get_events(
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event_ids,
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check_redacted=check_redacted,
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get_prev_content=get_prev_content,
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allow_rejected=allow_rejected,
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)
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defer.returnValue({e.event_id: e for e in events})
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@log_function
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def _persist_event_txn(self, txn, event, context,
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is_new_state=True, current_state=None):
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@ -29,6 +29,16 @@ def enumerate_leaves(node, depth):
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yield m
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class _Node(object):
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__slots__ = ["prev_node", "next_node", "key", "value"]
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def __init__(self, prev_node, next_node, key, value):
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self.prev_node = prev_node
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self.next_node = next_node
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self.key = key
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self.value = value
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class LruCache(object):
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"""
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Least-recently-used cache.
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@ -38,10 +48,9 @@ class LruCache(object):
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def __init__(self, max_size, keylen=1, cache_type=dict):
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cache = cache_type()
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self.cache = cache # Used for introspection.
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list_root = []
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list_root[:] = [list_root, list_root, None, None]
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PREV, NEXT, KEY, VALUE = 0, 1, 2, 3
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list_root = _Node(None, None, None, None)
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list_root.next_node = list_root
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list_root.prev_node = list_root
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lock = threading.Lock()
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@ -55,36 +64,36 @@ class LruCache(object):
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def add_node(key, value):
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prev_node = list_root
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next_node = prev_node[NEXT]
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node = [prev_node, next_node, key, value]
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prev_node[NEXT] = node
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next_node[PREV] = node
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next_node = prev_node.next_node
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node = _Node(prev_node, next_node, key, value)
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prev_node.next_node = node
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next_node.prev_node = node
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cache[key] = node
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def move_node_to_front(node):
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prev_node = node[PREV]
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next_node = node[NEXT]
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prev_node[NEXT] = next_node
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next_node[PREV] = prev_node
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prev_node = node.prev_node
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next_node = node.next_node
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prev_node.next_node = next_node
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next_node.prev_node = prev_node
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prev_node = list_root
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next_node = prev_node[NEXT]
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node[PREV] = prev_node
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node[NEXT] = next_node
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prev_node[NEXT] = node
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next_node[PREV] = node
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next_node = prev_node.next_node
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node.prev_node = prev_node
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node.next_node = next_node
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prev_node.next_node = node
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next_node.prev_node = node
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def delete_node(node):
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prev_node = node[PREV]
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next_node = node[NEXT]
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prev_node[NEXT] = next_node
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next_node[PREV] = prev_node
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prev_node = node.prev_node
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next_node = node.next_node
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prev_node.next_node = next_node
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next_node.prev_node = prev_node
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@synchronized
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def cache_get(key, default=None):
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node = cache.get(key, None)
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if node is not None:
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move_node_to_front(node)
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return node[VALUE]
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return node.value
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else:
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return default
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@ -93,25 +102,25 @@ class LruCache(object):
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node = cache.get(key, None)
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if node is not None:
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move_node_to_front(node)
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node[VALUE] = value
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node.value = value
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else:
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add_node(key, value)
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if len(cache) > max_size:
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todelete = list_root[PREV]
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todelete = list_root.prev_node
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delete_node(todelete)
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cache.pop(todelete[KEY], None)
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cache.pop(todelete.key, None)
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@synchronized
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def cache_set_default(key, value):
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node = cache.get(key, None)
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if node is not None:
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return node[VALUE]
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return node.value
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else:
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add_node(key, value)
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if len(cache) > max_size:
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todelete = list_root[PREV]
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todelete = list_root.prev_node
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delete_node(todelete)
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cache.pop(todelete[KEY], None)
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cache.pop(todelete.key, None)
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return value
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@synchronized
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@ -119,8 +128,8 @@ class LruCache(object):
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node = cache.get(key, None)
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if node:
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delete_node(node)
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cache.pop(node[KEY], None)
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return node[VALUE]
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cache.pop(node.key, None)
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return node.value
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else:
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return default
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@ -137,8 +146,8 @@ class LruCache(object):
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@synchronized
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def cache_clear():
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list_root[NEXT] = list_root
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list_root[PREV] = list_root
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list_root.next_node = list_root
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list_root.prev_node = list_root
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cache.clear()
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@synchronized
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