Add cache layer to state group resolution

This commit is contained in:
Erik Johnston 2015-02-06 16:08:13 +00:00
parent cc0532a4bf
commit c4e3029d55
2 changed files with 72 additions and 1 deletions

View File

@ -43,14 +43,30 @@ AuthEventTypes = (
)
class _StateCacheEntry(object):
def __init__(self, state, state_group, ts):
self.state = state
self.state_group = state_group
self.ts = ts
class StateHandler(object):
""" Responsible for doing state conflict resolution.
"""
def __init__(self, hs):
self.clock = hs.get_clock()
self.store = hs.get_datastore()
self.hs = hs
# set of event_ids -> _StateCacheEntry.
self._state_cache = {}
def f():
self._prune_cache()
self.clock.looping_call(f, 10*1000)
@defer.inlineCallbacks
def get_current_state(self, room_id, event_type=None, state_key=""):
""" Returns the current state for the room as a list. This is done by
@ -70,6 +86,11 @@ class StateHandler(object):
for e_id, _, _ in events
]
cache = self._state_cache.get(set(event_ids), None)
if cache:
cache.ts = self.clock.time_msec()
defer.returnValue(cache.state_group, cache.state)
res = yield self.resolve_state_groups(event_ids)
if event_type:
@ -177,6 +198,11 @@ class StateHandler(object):
"""
logger.debug("resolve_state_groups event_ids %s", event_ids)
cache = self._state_cache.get(set(event_ids), None)
if cache and cache.state_group:
cache.ts = self.clock.time_msec()
defer.returnValue(cache.state_group, cache.state)
state_groups = yield self.store.get_state_groups(
event_ids
)
@ -200,6 +226,14 @@ class StateHandler(object):
else:
prev_states = []
cache = _StateCacheEntry(
state=state,
state_group=name,
ts=self.clock.time_msec()
)
self._state_cache[set(event_ids)] = cache
defer.returnValue((name, state, prev_states))
state = {}
@ -245,6 +279,14 @@ class StateHandler(object):
new_state = unconflicted_state
new_state.update(resolved_state)
cache = _StateCacheEntry(
state=new_state,
state_group=None,
ts=self.clock.time_msec()
)
self._state_cache[set(event_ids)] = cache
defer.returnValue((None, new_state, prev_states))
@log_function
@ -328,3 +370,24 @@ class StateHandler(object):
return -int(e.depth), hashlib.sha1(e.event_id).hexdigest()
return sorted(events, key=key_func)
def _prune_cache(self):
now = self.clock.time_msec()
if len(self._state_cache) > 100:
sorted_entries = sorted(
self._state_cache.items(),
key=lambda k, v: v.ts,
)
for k, _ in sorted_entries[100:]:
self._state_cache.pop(k)
keys_to_delete = set()
for key, cache_entry in self._state_cache.items():
if now - cache_entry.ts > 60*1000:
keys_to_delete.add(key)
for k in keys_to_delete:
self._state_cache.pop(k)

View File

@ -15,7 +15,7 @@
from synapse.util.logcontext import LoggingContext
from twisted.internet import reactor
from twisted.internet import reactor, task
import time
@ -35,6 +35,14 @@ class Clock(object):
"""Returns the current system time in miliseconds since epoch."""
return self.time() * 1000
def looping_call(self, f, msec):
l = task.LoopingCall(f)
l.start(msec/1000.0, now=False)
return l
def looping_call(self, loop):
loop.stop()
def call_later(self, delay, callback):
current_context = LoggingContext.current_context()