Merge pull request #3556 from matrix-org/rav/background_processes
Run things as background processespull/3563/head
commit
c754e006f4
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@ -0,0 +1 @@
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Add metrics to track resource usage by background processes
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@ -168,7 +168,7 @@ class TransactionQueue(object):
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# fire off a processing loop in the background
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run_as_background_process(
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"process_transaction_queue",
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"process_event_queue_for_federation",
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self._process_event_queue_loop,
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)
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@ -434,14 +434,11 @@ class TransactionQueue(object):
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logger.debug("TX [%s] Starting transaction loop", destination)
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# Drop the logcontext before starting the transaction. It doesn't
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# really make sense to log all the outbound transactions against
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# whatever path led us to this point: that's pretty arbitrary really.
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#
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# (this also means we can fire off _perform_transaction without
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# yielding)
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with logcontext.PreserveLoggingContext():
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self._transaction_transmission_loop(destination)
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run_as_background_process(
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"federation_transaction_transmission_loop",
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self._transaction_transmission_loop,
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destination,
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)
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@defer.inlineCallbacks
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def _transaction_transmission_loop(self, destination):
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@ -19,6 +19,8 @@ from canonicaljson import json
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from twisted.internet import defer
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from synapse.metrics.background_process_metrics import run_as_background_process
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from . import engines
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from ._base import SQLBaseStore
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@ -87,10 +89,14 @@ class BackgroundUpdateStore(SQLBaseStore):
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self._background_update_handlers = {}
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self._all_done = False
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@defer.inlineCallbacks
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def start_doing_background_updates(self):
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logger.info("Starting background schema updates")
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run_as_background_process(
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"background_updates", self._run_background_updates,
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)
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@defer.inlineCallbacks
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def _run_background_updates(self):
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logger.info("Starting background schema updates")
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while True:
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yield self.hs.get_clock().sleep(
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self.BACKGROUND_UPDATE_INTERVAL_MS / 1000.)
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@ -19,6 +19,7 @@ from six import iteritems
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from twisted.internet import defer
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from synapse.metrics.background_process_metrics import run_as_background_process
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from synapse.util.caches import CACHE_SIZE_FACTOR
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from . import background_updates
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@ -93,10 +94,16 @@ class ClientIpStore(background_updates.BackgroundUpdateStore):
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self._batch_row_update[key] = (user_agent, device_id, now)
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def _update_client_ips_batch(self):
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to_update = self._batch_row_update
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self._batch_row_update = {}
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return self.runInteraction(
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"_update_client_ips_batch", self._update_client_ips_batch_txn, to_update
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def update():
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to_update = self._batch_row_update
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self._batch_row_update = {}
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return self.runInteraction(
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"_update_client_ips_batch", self._update_client_ips_batch_txn,
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to_update,
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)
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run_as_background_process(
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"update_client_ips", update,
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)
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def _update_client_ips_batch_txn(self, txn, to_update):
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@ -33,12 +33,13 @@ from synapse.api.errors import SynapseError
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# these are only included to make the type annotations work
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from synapse.events import EventBase # noqa: F401
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from synapse.events.snapshot import EventContext # noqa: F401
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from synapse.metrics.background_process_metrics import run_as_background_process
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from synapse.storage.events_worker import EventsWorkerStore
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from synapse.types import RoomStreamToken, get_domain_from_id
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from synapse.util.async import ObservableDeferred
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from synapse.util.caches.descriptors import cached, cachedInlineCallbacks
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from synapse.util.frozenutils import frozendict_json_encoder
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from synapse.util.logcontext import PreserveLoggingContext, make_deferred_yieldable
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from synapse.util.logcontext import make_deferred_yieldable
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from synapse.util.logutils import log_function
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from synapse.util.metrics import Measure
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@ -155,11 +156,8 @@ class _EventPeristenceQueue(object):
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self._event_persist_queues[room_id] = queue
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self._currently_persisting_rooms.discard(room_id)
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# set handle_queue_loop off on the background. We don't want to
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# attribute work done in it to the current request, so we drop the
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# logcontext altogether.
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with PreserveLoggingContext():
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handle_queue_loop()
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# set handle_queue_loop off in the background
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run_as_background_process("persist_events", handle_queue_loop)
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def _get_drainining_queue(self, room_id):
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queue = self._event_persist_queues.setdefault(room_id, deque())
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@ -25,6 +25,7 @@ from synapse.events import EventBase # noqa: F401
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from synapse.events import FrozenEvent
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from synapse.events.snapshot import EventContext # noqa: F401
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from synapse.events.utils import prune_event
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from synapse.metrics.background_process_metrics import run_as_background_process
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from synapse.util.logcontext import (
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LoggingContext,
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PreserveLoggingContext,
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@ -322,10 +323,11 @@ class EventsWorkerStore(SQLBaseStore):
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should_start = False
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if should_start:
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with PreserveLoggingContext():
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self.runWithConnection(
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self._do_fetch
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)
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run_as_background_process(
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"fetch_events",
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self.runWithConnection,
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self._do_fetch,
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)
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logger.debug("Loading %d events", len(events))
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with PreserveLoggingContext():
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@ -16,6 +16,7 @@
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import logging
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from collections import OrderedDict
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from synapse.metrics.background_process_metrics import run_as_background_process
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from synapse.util.caches import register_cache
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logger = logging.getLogger(__name__)
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@ -63,7 +64,10 @@ class ExpiringCache(object):
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return
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def f():
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self._prune_cache()
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run_as_background_process(
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"prune_cache_%s" % self._cache_name,
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self._prune_cache,
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)
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self._clock.looping_call(f, self._expiry_ms / 2)
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@ -17,20 +17,18 @@ import logging
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from twisted.internet import defer
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from synapse.util import unwrapFirstError
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from synapse.util.logcontext import PreserveLoggingContext
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from synapse.metrics.background_process_metrics import run_as_background_process
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from synapse.util.logcontext import make_deferred_yieldable, run_in_background
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logger = logging.getLogger(__name__)
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def user_left_room(distributor, user, room_id):
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with PreserveLoggingContext():
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distributor.fire("user_left_room", user=user, room_id=room_id)
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distributor.fire("user_left_room", user=user, room_id=room_id)
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def user_joined_room(distributor, user, room_id):
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with PreserveLoggingContext():
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distributor.fire("user_joined_room", user=user, room_id=room_id)
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distributor.fire("user_joined_room", user=user, room_id=room_id)
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class Distributor(object):
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@ -44,9 +42,7 @@ class Distributor(object):
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model will do for today.
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"""
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def __init__(self, suppress_failures=True):
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self.suppress_failures = suppress_failures
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def __init__(self):
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self.signals = {}
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self.pre_registration = {}
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@ -56,7 +52,6 @@ class Distributor(object):
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self.signals[name] = Signal(
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name,
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suppress_failures=self.suppress_failures,
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)
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if name in self.pre_registration:
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@ -75,10 +70,18 @@ class Distributor(object):
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self.pre_registration[name].append(observer)
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def fire(self, name, *args, **kwargs):
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"""Dispatches the given signal to the registered observers.
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Runs the observers as a background process. Does not return a deferred.
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"""
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if name not in self.signals:
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raise KeyError("%r does not have a signal named %s" % (self, name))
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return self.signals[name].fire(*args, **kwargs)
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run_as_background_process(
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name,
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self.signals[name].fire,
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*args, **kwargs
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)
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class Signal(object):
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@ -91,9 +94,8 @@ class Signal(object):
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method into all of the observers.
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"""
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def __init__(self, name, suppress_failures):
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def __init__(self, name):
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self.name = name
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self.suppress_failures = suppress_failures
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self.observers = []
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def observe(self, observer):
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@ -103,7 +105,6 @@ class Signal(object):
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Each observer callable may return a Deferred."""
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self.observers.append(observer)
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@defer.inlineCallbacks
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def fire(self, *args, **kwargs):
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"""Invokes every callable in the observer list, passing in the args and
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kwargs. Exceptions thrown by observers are logged but ignored. It is
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@ -121,22 +122,17 @@ class Signal(object):
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failure.type,
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failure.value,
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failure.getTracebackObject()))
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if not self.suppress_failures:
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return failure
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return defer.maybeDeferred(observer, *args, **kwargs).addErrback(eb)
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with PreserveLoggingContext():
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deferreds = [
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do(observer)
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for observer in self.observers
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]
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deferreds = [
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run_in_background(do, o)
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for o in self.observers
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]
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res = yield defer.gatherResults(
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deferreds, consumeErrors=True
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).addErrback(unwrapFirstError)
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defer.returnValue(res)
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return make_deferred_yieldable(defer.gatherResults(
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deferreds, consumeErrors=True,
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))
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def __repr__(self):
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return "<Signal name=%r>" % (self.name,)
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@ -1,5 +1,6 @@
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# -*- coding: utf-8 -*-
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# Copyright 2014-2016 OpenMarket Ltd
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# Copyright 2018 New Vector Ltd
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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@ -15,8 +16,6 @@
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from mock import Mock, patch
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from twisted.internet import defer
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from synapse.util.distributor import Distributor
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from . import unittest
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@ -27,38 +26,15 @@ class DistributorTestCase(unittest.TestCase):
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def setUp(self):
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self.dist = Distributor()
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@defer.inlineCallbacks
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def test_signal_dispatch(self):
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self.dist.declare("alert")
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observer = Mock()
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self.dist.observe("alert", observer)
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d = self.dist.fire("alert", 1, 2, 3)
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yield d
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self.assertTrue(d.called)
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self.dist.fire("alert", 1, 2, 3)
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observer.assert_called_with(1, 2, 3)
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@defer.inlineCallbacks
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def test_signal_dispatch_deferred(self):
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self.dist.declare("whine")
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d_inner = defer.Deferred()
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def observer():
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return d_inner
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self.dist.observe("whine", observer)
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d_outer = self.dist.fire("whine")
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self.assertFalse(d_outer.called)
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d_inner.callback(None)
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yield d_outer
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self.assertTrue(d_outer.called)
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@defer.inlineCallbacks
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def test_signal_catch(self):
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self.dist.declare("alarm")
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with patch(
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"synapse.util.distributor.logger", spec=["warning"]
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) as mock_logger:
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d = self.dist.fire("alarm", "Go")
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yield d
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self.assertTrue(d.called)
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self.dist.fire("alarm", "Go")
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observers[0].assert_called_once_with("Go")
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observers[1].assert_called_once_with("Go")
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@ -83,34 +57,12 @@ class DistributorTestCase(unittest.TestCase):
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mock_logger.warning.call_args[0][0], str
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)
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@defer.inlineCallbacks
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def test_signal_catch_no_suppress(self):
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# Gut-wrenching
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self.dist.suppress_failures = False
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self.dist.declare("whail")
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class MyException(Exception):
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pass
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@defer.inlineCallbacks
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def observer():
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raise MyException("Oopsie")
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self.dist.observe("whail", observer)
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d = self.dist.fire("whail")
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yield self.assertFailure(d, MyException)
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self.dist.suppress_failures = True
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@defer.inlineCallbacks
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def test_signal_prereg(self):
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observer = Mock()
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self.dist.observe("flare", observer)
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self.dist.declare("flare")
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yield self.dist.fire("flare", 4, 5)
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self.dist.fire("flare", 4, 5)
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observer.assert_called_with(4, 5)
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