diff options
Diffstat (limited to 'synapse/util')
| -rw-r--r-- | synapse/util/async.py | 145 | ||||
| -rw-r--r-- | synapse/util/caches/expiringcache.py | 6 | ||||
| -rw-r--r-- | synapse/util/distributor.py | 48 | ||||
| -rw-r--r-- | synapse/util/logcontext.py | 11 | ||||
| -rw-r--r-- | synapse/util/metrics.py | 19 |
5 files changed, 104 insertions, 125 deletions
diff --git a/synapse/util/async.py b/synapse/util/async.py index 5d0fb39130..a7094e2fb4 100644 --- a/synapse/util/async.py +++ b/synapse/util/async.py @@ -1,5 +1,6 @@ # -*- coding: utf-8 -*- # Copyright 2014-2016 OpenMarket Ltd +# Copyright 2018 New Vector Ltd. # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. @@ -12,7 +13,7 @@ # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. - +import collections import logging from contextlib import contextmanager @@ -156,54 +157,72 @@ def concurrently_execute(func, args, limit): class Linearizer(object): - """Linearizes access to resources based on a key. Useful to ensure only one - thing is happening at a time on a given resource. + """Limits concurrent access to resources based on a key. Useful to ensure + only a few things happen at a time on a given resource. Example: - with (yield linearizer.queue("test_key")): + with (yield limiter.queue("test_key")): # do some work. """ - def __init__(self, name=None, clock=None): + def __init__(self, name=None, max_count=1, clock=None): + """ + Args: + max_count(int): The maximum number of concurrent accesses + """ if name is None: self.name = id(self) else: self.name = name - self.key_to_defer = {} if not clock: from twisted.internet import reactor clock = Clock(reactor) self._clock = clock + self.max_count = max_count + + # key_to_defer is a map from the key to a 2 element list where + # the first element is the number of things executing, and + # the second element is an OrderedDict, where the keys are deferreds for the + # things blocked from executing. + self.key_to_defer = {} @defer.inlineCallbacks def queue(self, key): - # If there is already a deferred in the queue, we pull it out so that - # we can wait on it later. - # Then we replace it with a deferred that we resolve *after* the - # context manager has exited. - # We only return the context manager after the previous deferred has - # resolved. - # This all has the net effect of creating a chain of deferreds that - # wait for the previous deferred before starting their work. - current_defer = self.key_to_defer.get(key) + entry = self.key_to_defer.setdefault(key, [0, collections.OrderedDict()]) - new_defer = defer.Deferred() - self.key_to_defer[key] = new_defer + # If the number of things executing is greater than the maximum + # then add a deferred to the list of blocked items + # When on of the things currently executing finishes it will callback + # this item so that it can continue executing. + if entry[0] >= self.max_count: + new_defer = defer.Deferred() + entry[1][new_defer] = 1 - if current_defer: logger.info( - "Waiting to acquire linearizer lock %r for key %r", self.name, key + "Waiting to acquire linearizer lock %r for key %r", self.name, key, ) try: - with PreserveLoggingContext(): - yield current_defer - except Exception: - logger.exception("Unexpected exception in Linearizer") - - logger.info("Acquired linearizer lock %r for key %r", self.name, - key) + yield make_deferred_yieldable(new_defer) + except Exception as e: + if isinstance(e, CancelledError): + logger.info( + "Cancelling wait for linearizer lock %r for key %r", + self.name, key, + ) + else: + logger.warn( + "Unexpected exception waiting for linearizer lock %r for key %r", + self.name, key, + ) + + # we just have to take ourselves back out of the queue. + del entry[1][new_defer] + raise + + logger.info("Acquired linearizer lock %r for key %r", self.name, key) + entry[0] += 1 # if the code holding the lock completes synchronously, then it # will recursively run the next claimant on the list. That can @@ -213,15 +232,15 @@ class Linearizer(object): # In order to break the cycle, we add a cheeky sleep(0) here to # ensure that we fall back to the reactor between each iteration. # - # (There's no particular need for it to happen before we return - # the context manager, but it needs to happen while we hold the - # lock, and the context manager's exit code must be synchronous, - # so actually this is the only sensible place. + # (This needs to happen while we hold the lock, and the context manager's exit + # code must be synchronous, so this is the only sensible place.) yield self._clock.sleep(0) else: - logger.info("Acquired uncontended linearizer lock %r for key %r", - self.name, key) + logger.info( + "Acquired uncontended linearizer lock %r for key %r", self.name, key, + ) + entry[0] += 1 @contextmanager def _ctx_manager(): @@ -229,73 +248,15 @@ class Linearizer(object): yield finally: logger.info("Releasing linearizer lock %r for key %r", self.name, key) - with PreserveLoggingContext(): - new_defer.callback(None) - current_d = self.key_to_defer.get(key) - if current_d is new_defer: - self.key_to_defer.pop(key, None) - - defer.returnValue(_ctx_manager()) - - -class Limiter(object): - """Limits concurrent access to resources based on a key. Useful to ensure - only a few thing happen at a time on a given resource. - - Example: - - with (yield limiter.queue("test_key")): - # do some work. - - """ - def __init__(self, max_count): - """ - Args: - max_count(int): The maximum number of concurrent access - """ - self.max_count = max_count - - # key_to_defer is a map from the key to a 2 element list where - # the first element is the number of things executing - # the second element is a list of deferreds for the things blocked from - # executing. - self.key_to_defer = {} - - @defer.inlineCallbacks - def queue(self, key): - entry = self.key_to_defer.setdefault(key, [0, []]) - - # If the number of things executing is greater than the maximum - # then add a deferred to the list of blocked items - # When on of the things currently executing finishes it will callback - # this item so that it can continue executing. - if entry[0] >= self.max_count: - new_defer = defer.Deferred() - entry[1].append(new_defer) - - logger.info("Waiting to acquire limiter lock for key %r", key) - with PreserveLoggingContext(): - yield new_defer - logger.info("Acquired limiter lock for key %r", key) - else: - logger.info("Acquired uncontended limiter lock for key %r", key) - - entry[0] += 1 - - @contextmanager - def _ctx_manager(): - try: - yield - finally: - logger.info("Releasing limiter lock for key %r", key) # We've finished executing so check if there are any things # blocked waiting to execute and start one of them entry[0] -= 1 if entry[1]: - next_def = entry[1].pop(0) + (next_def, _) = entry[1].popitem(last=False) + # we need to run the next thing in the sentinel context. with PreserveLoggingContext(): next_def.callback(None) elif entry[0] == 0: diff --git a/synapse/util/caches/expiringcache.py b/synapse/util/caches/expiringcache.py index 4abca91f6d..465adc54a8 100644 --- a/synapse/util/caches/expiringcache.py +++ b/synapse/util/caches/expiringcache.py @@ -16,6 +16,7 @@ import logging from collections import OrderedDict +from synapse.metrics.background_process_metrics import run_as_background_process from synapse.util.caches import register_cache logger = logging.getLogger(__name__) @@ -63,7 +64,10 @@ class ExpiringCache(object): return def f(): - self._prune_cache() + run_as_background_process( + "prune_cache_%s" % self._cache_name, + self._prune_cache, + ) self._clock.looping_call(f, self._expiry_ms / 2) diff --git a/synapse/util/distributor.py b/synapse/util/distributor.py index 734331caaa..194da87639 100644 --- a/synapse/util/distributor.py +++ b/synapse/util/distributor.py @@ -17,20 +17,18 @@ import logging from twisted.internet import defer -from synapse.util import unwrapFirstError -from synapse.util.logcontext import PreserveLoggingContext +from synapse.metrics.background_process_metrics import run_as_background_process +from synapse.util.logcontext import make_deferred_yieldable, run_in_background logger = logging.getLogger(__name__) def user_left_room(distributor, user, room_id): - with PreserveLoggingContext(): - distributor.fire("user_left_room", user=user, room_id=room_id) + distributor.fire("user_left_room", user=user, room_id=room_id) def user_joined_room(distributor, user, room_id): - with PreserveLoggingContext(): - distributor.fire("user_joined_room", user=user, room_id=room_id) + distributor.fire("user_joined_room", user=user, room_id=room_id) class Distributor(object): @@ -44,9 +42,7 @@ class Distributor(object): model will do for today. """ - def __init__(self, suppress_failures=True): - self.suppress_failures = suppress_failures - + def __init__(self): self.signals = {} self.pre_registration = {} @@ -56,7 +52,6 @@ class Distributor(object): self.signals[name] = Signal( name, - suppress_failures=self.suppress_failures, ) if name in self.pre_registration: @@ -75,10 +70,18 @@ class Distributor(object): self.pre_registration[name].append(observer) def fire(self, name, *args, **kwargs): + """Dispatches the given signal to the registered observers. + + Runs the observers as a background process. Does not return a deferred. + """ if name not in self.signals: raise KeyError("%r does not have a signal named %s" % (self, name)) - return self.signals[name].fire(*args, **kwargs) + run_as_background_process( + name, + self.signals[name].fire, + *args, **kwargs + ) class Signal(object): @@ -91,9 +94,8 @@ class Signal(object): method into all of the observers. """ - def __init__(self, name, suppress_failures): + def __init__(self, name): self.name = name - self.suppress_failures = suppress_failures self.observers = [] def observe(self, observer): @@ -103,7 +105,6 @@ class Signal(object): Each observer callable may return a Deferred.""" self.observers.append(observer) - @defer.inlineCallbacks def fire(self, *args, **kwargs): """Invokes every callable in the observer list, passing in the args and kwargs. Exceptions thrown by observers are logged but ignored. It is @@ -121,22 +122,17 @@ class Signal(object): failure.type, failure.value, failure.getTracebackObject())) - if not self.suppress_failures: - return failure return defer.maybeDeferred(observer, *args, **kwargs).addErrback(eb) - with PreserveLoggingContext(): - deferreds = [ - do(observer) - for observer in self.observers - ] - - res = yield defer.gatherResults( - deferreds, consumeErrors=True - ).addErrback(unwrapFirstError) + deferreds = [ + run_in_background(do, o) + for o in self.observers + ] - defer.returnValue(res) + return make_deferred_yieldable(defer.gatherResults( + deferreds, consumeErrors=True, + )) def __repr__(self): return "<Signal name=%r>" % (self.name,) diff --git a/synapse/util/logcontext.py b/synapse/util/logcontext.py index f6c7175f74..8dcae50b39 100644 --- a/synapse/util/logcontext.py +++ b/synapse/util/logcontext.py @@ -99,6 +99,17 @@ class ContextResourceUsage(object): self.db_sched_duration_sec = 0 self.evt_db_fetch_count = 0 + def __repr__(self): + return ("<ContextResourceUsage ru_stime='%r', ru_utime='%r', " + "db_txn_count='%r', db_txn_duration_sec='%r', " + "db_sched_duration_sec='%r', evt_db_fetch_count='%r'>") % ( + self.ru_stime, + self.ru_utime, + self.db_txn_count, + self.db_txn_duration_sec, + self.db_sched_duration_sec, + self.evt_db_fetch_count,) + def __iadd__(self, other): """Add another ContextResourceUsage's stats to this one's. diff --git a/synapse/util/metrics.py b/synapse/util/metrics.py index 6ba7107896..97f1267380 100644 --- a/synapse/util/metrics.py +++ b/synapse/util/metrics.py @@ -104,12 +104,19 @@ class Measure(object): logger.warn("Expected context. (%r)", self.name) return - usage = context.get_resource_usage() - self.start_usage - block_ru_utime.labels(self.name).inc(usage.ru_utime) - block_ru_stime.labels(self.name).inc(usage.ru_stime) - block_db_txn_count.labels(self.name).inc(usage.db_txn_count) - block_db_txn_duration.labels(self.name).inc(usage.db_txn_duration_sec) - block_db_sched_duration.labels(self.name).inc(usage.db_sched_duration_sec) + current = context.get_resource_usage() + usage = current - self.start_usage + try: + block_ru_utime.labels(self.name).inc(usage.ru_utime) + block_ru_stime.labels(self.name).inc(usage.ru_stime) + block_db_txn_count.labels(self.name).inc(usage.db_txn_count) + block_db_txn_duration.labels(self.name).inc(usage.db_txn_duration_sec) + block_db_sched_duration.labels(self.name).inc(usage.db_sched_duration_sec) + except ValueError: + logger.warn( + "Failed to save metrics! OLD: %r, NEW: %r", + self.start_usage, current + ) if self.created_context: self.start_context.__exit__(exc_type, exc_val, exc_tb) |