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Merge pull request #662 from matrix-org/erikj/state_cache

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Make StateHandler._state_cache only store event_ids.
This commit is contained in:
Erik Johnston 2016-03-23 11:43:03 +00:00
commit 0e7363e0b3
3 changed files with 95 additions and 70 deletions
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67
synapse/state.py
View file

@ -28,6 +28,7 @@ from collections import namedtuple
import logging
import hashlib
import os
logger = logging.getLogger(__name__)
@ -35,8 +36,11 @@ logger = logging.getLogger(__name__)
KeyStateTuple = namedtuple("KeyStateTuple", ("context", "type", "state_key"))
SIZE_OF_CACHE = 1000
EVICTION_TIMEOUT_SECONDS = 20
CACHE_SIZE_FACTOR = float(os.environ.get("SYNAPSE_CACHE_FACTOR", 0.1))
SIZE_OF_CACHE = int(1000 * CACHE_SIZE_FACTOR)
EVICTION_TIMEOUT_SECONDS = 60 * 60
class _StateCacheEntry(object):
@ -86,16 +90,8 @@ class StateHandler(object):
"""
event_ids = yield self.store.get_latest_event_ids_in_room(room_id)
cache = None
if self._state_cache is not None:
cache = self._state_cache.get(frozenset(event_ids), None)
if cache:
cache.ts = self.clock.time_msec()
state = cache.state
else:
res = yield self.resolve_state_groups(room_id, event_ids)
state = res[1]
res = yield self.resolve_state_groups(room_id, event_ids)
state = res[1]
if event_type:
defer.returnValue(state.get((event_type, state_key)))
@ -187,20 +183,6 @@ class StateHandler(object):
"""
logger.debug("resolve_state_groups event_ids %s", event_ids)
if self._state_cache is not None:
cache = self._state_cache.get(frozenset(event_ids), None)
if cache and cache.state_group:
cache.ts = self.clock.time_msec()
prev_state = cache.state.get((event_type, state_key), None)
if prev_state:
prev_state = prev_state.event_id
prev_states = [prev_state]
else:
prev_states = []
defer.returnValue(
(cache.state_group, cache.state, prev_states)
)
state_groups = yield self.store.get_state_groups(
room_id, event_ids
)
@ -210,7 +192,7 @@ class StateHandler(object):
state_groups.keys()
)
group_names = set(state_groups.keys())
group_names = frozenset(state_groups.keys())
if len(group_names) == 1:
name, state_list = state_groups.items().pop()
state = {
@ -224,29 +206,38 @@ class StateHandler(object):
else:
prev_states = []
if self._state_cache is not None:
cache = _StateCacheEntry(
state=state,
state_group=name,
ts=self.clock.time_msec()
)
self._state_cache[frozenset(event_ids)] = cache
defer.returnValue((name, state, prev_states))
if self._state_cache is not None:
cache = self._state_cache.get(group_names, None)
if cache and cache.state_group:
cache.ts = self.clock.time_msec()
event_dict = yield self.store.get_events(cache.state.values())
state = {(e.type, e.state_key): e for e in event_dict.values()}
prev_state = state.get((event_type, state_key), None)
if prev_state:
prev_state = prev_state.event_id
prev_states = [prev_state]
else:
prev_states = []
defer.returnValue(
(cache.state_group, state, prev_states)
)
new_state, prev_states = self._resolve_events(
state_groups.values(), event_type, state_key
)
if self._state_cache is not None:
cache = _StateCacheEntry(
state=new_state,
state={key: event.event_id for key, event in new_state.items()},
state_group=None,
ts=self.clock.time_msec()
)
self._state_cache[frozenset(event_ids)] = cache
self._state_cache[group_names] = cache
defer.returnValue((None, new_state, prev_states))

25
synapse/storage/events.py
View file

@ -151,6 +151,31 @@ class EventsStore(SQLBaseStore):
defer.returnValue(events[0] if events else None)
@defer.inlineCallbacks
def get_events(self, event_ids, check_redacted=True,
get_prev_content=False, allow_rejected=False):
"""Get events from the database
Args:
event_ids (list): The event_ids of the events to fetch
check_redacted (bool): If True, check if event has been redacted
and redact it.
get_prev_content (bool): If True and event is a state event,
include the previous states content in the unsigned field.
allow_rejected (bool): If True return rejected events.
Returns:
Deferred : Dict from event_id to event.
"""
events = yield self._get_events(
event_ids,
check_redacted=check_redacted,
get_prev_content=get_prev_content,
allow_rejected=allow_rejected,
)
defer.returnValue({e.event_id: e for e in events})
@log_function
def _persist_event_txn(self, txn, event, context,
is_new_state=True, current_state=None):

73
synapse/util/caches/lrucache.py
View file

@ -29,6 +29,16 @@ def enumerate_leaves(node, depth):
yield m
class _Node(object):
__slots__ = ["prev_node", "next_node", "key", "value"]
def __init__(self, prev_node, next_node, key, value):
self.prev_node = prev_node
self.next_node = next_node
self.key = key
self.value = value
class LruCache(object):
"""
Least-recently-used cache.
@ -38,10 +48,9 @@ class LruCache(object):
def __init__(self, max_size, keylen=1, cache_type=dict):
cache = cache_type()
self.cache = cache # Used for introspection.
list_root = []
list_root[:] = [list_root, list_root, None, None]
PREV, NEXT, KEY, VALUE = 0, 1, 2, 3
list_root = _Node(None, None, None, None)
list_root.next_node = list_root
list_root.prev_node = list_root
lock = threading.Lock()
@ -55,36 +64,36 @@ class LruCache(object):
def add_node(key, value):
prev_node = list_root
next_node = prev_node[NEXT]
node = [prev_node, next_node, key, value]
prev_node[NEXT] = node
next_node[PREV] = node
next_node = prev_node.next_node
node = _Node(prev_node, next_node, key, value)
prev_node.next_node = node
next_node.prev_node = node
cache[key] = node
def move_node_to_front(node):
prev_node = node[PREV]
next_node = node[NEXT]
prev_node[NEXT] = next_node
next_node[PREV] = prev_node
prev_node = node.prev_node
next_node = node.next_node
prev_node.next_node = next_node
next_node.prev_node = prev_node
prev_node = list_root
next_node = prev_node[NEXT]
node[PREV] = prev_node
node[NEXT] = next_node
prev_node[NEXT] = node
next_node[PREV] = node
next_node = prev_node.next_node
node.prev_node = prev_node
node.next_node = next_node
prev_node.next_node = node
next_node.prev_node = node
def delete_node(node):
prev_node = node[PREV]
next_node = node[NEXT]
prev_node[NEXT] = next_node
next_node[PREV] = prev_node
prev_node = node.prev_node
next_node = node.next_node
prev_node.next_node = next_node
next_node.prev_node = prev_node
@synchronized
def cache_get(key, default=None):
node = cache.get(key, None)
if node is not None:
move_node_to_front(node)
return node[VALUE]
return node.value
else:
return default
@ -93,25 +102,25 @@ class LruCache(object):
node = cache.get(key, None)
if node is not None:
move_node_to_front(node)
node[VALUE] = value
node.value = value
else:
add_node(key, value)
if len(cache) > max_size:
todelete = list_root[PREV]
todelete = list_root.prev_node
delete_node(todelete)
cache.pop(todelete[KEY], None)
cache.pop(todelete.key, None)
@synchronized
def cache_set_default(key, value):
node = cache.get(key, None)
if node is not None:
return node[VALUE]
return node.value
else:
add_node(key, value)
if len(cache) > max_size:
todelete = list_root[PREV]
todelete = list_root.prev_node
delete_node(todelete)
cache.pop(todelete[KEY], None)
cache.pop(todelete.key, None)
return value
@synchronized
@ -119,8 +128,8 @@ class LruCache(object):
node = cache.get(key, None)
if node:
delete_node(node)
cache.pop(node[KEY], None)
return node[VALUE]
cache.pop(node.key, None)
return node.value
else:
return default
@ -137,8 +146,8 @@ class LruCache(object):
@synchronized
def cache_clear():
list_root[NEXT] = list_root
list_root[PREV] = list_root
list_root.next_node = list_root
list_root.prev_node = list_root
cache.clear()
@synchronized