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Run things as background processes

This fixes #3518, and ensures that we get useful logs and metrics for lots of
things that happen in the background.

(There are certainly more things that happen in the background; these are just
the common ones I've found running a single-process synapse locally).
This commit is contained in:
Richard van der Hoff 2018-07-18 14:35:24 +01:00
parent 65d6a0e477
commit 667fba68f3
7 changed files with 44 additions and 26 deletions

View file

@ -168,7 +168,7 @@ class TransactionQueue(object):
# fire off a processing loop in the background
run_as_background_process(
"process_transaction_queue",
"process_event_queue_for_federation",
self._process_event_queue_loop,
)
@ -434,14 +434,11 @@ class TransactionQueue(object):
logger.debug("TX [%s] Starting transaction loop", destination)
# Drop the logcontext before starting the transaction. It doesn't
# really make sense to log all the outbound transactions against
# whatever path led us to this point: that's pretty arbitrary really.
#
# (this also means we can fire off _perform_transaction without
# yielding)
with logcontext.PreserveLoggingContext():
self._transaction_transmission_loop(destination)
run_as_background_process(
"federation_transaction_transmission_loop",
self._transaction_transmission_loop,
destination,
)
@defer.inlineCallbacks
def _transaction_transmission_loop(self, destination):

View file

@ -19,6 +19,8 @@ from canonicaljson import json
from twisted.internet import defer
from synapse.metrics.background_process_metrics import run_as_background_process
from . import engines
from ._base import SQLBaseStore
@ -87,10 +89,14 @@ class BackgroundUpdateStore(SQLBaseStore):
self._background_update_handlers = {}
self._all_done = False
@defer.inlineCallbacks
def start_doing_background_updates(self):
logger.info("Starting background schema updates")
run_as_background_process(
"background_updates", self._run_background_updates,
)
@defer.inlineCallbacks
def _run_background_updates(self):
logger.info("Starting background schema updates")
while True:
yield self.hs.get_clock().sleep(
self.BACKGROUND_UPDATE_INTERVAL_MS / 1000.)

View file

@ -19,6 +19,7 @@ from six import iteritems
from twisted.internet import defer
from synapse.metrics.background_process_metrics import run_as_background_process
from synapse.util.caches import CACHE_SIZE_FACTOR
from . import background_updates
@ -93,10 +94,16 @@ class ClientIpStore(background_updates.BackgroundUpdateStore):
self._batch_row_update[key] = (user_agent, device_id, now)
def _update_client_ips_batch(self):
to_update = self._batch_row_update
self._batch_row_update = {}
return self.runInteraction(
"_update_client_ips_batch", self._update_client_ips_batch_txn, to_update
def update():
to_update = self._batch_row_update
self._batch_row_update = {}
return self.runInteraction(
"_update_client_ips_batch", self._update_client_ips_batch_txn,
to_update,
)
run_as_background_process(
"update_client_ips", update,
)
def _update_client_ips_batch_txn(self, txn, to_update):

View file

@ -33,12 +33,13 @@ from synapse.api.errors import SynapseError
# these are only included to make the type annotations work
from synapse.events import EventBase # noqa: F401
from synapse.events.snapshot import EventContext # noqa: F401
from synapse.metrics.background_process_metrics import run_as_background_process
from synapse.storage.events_worker import EventsWorkerStore
from synapse.types import RoomStreamToken, get_domain_from_id
from synapse.util.async import ObservableDeferred
from synapse.util.caches.descriptors import cached, cachedInlineCallbacks
from synapse.util.frozenutils import frozendict_json_encoder
from synapse.util.logcontext import PreserveLoggingContext, make_deferred_yieldable
from synapse.util.logcontext import make_deferred_yieldable
from synapse.util.logutils import log_function
from synapse.util.metrics import Measure
@ -155,11 +156,8 @@ class _EventPeristenceQueue(object):
self._event_persist_queues[room_id] = queue
self._currently_persisting_rooms.discard(room_id)
# set handle_queue_loop off on the background. We don't want to
# attribute work done in it to the current request, so we drop the
# logcontext altogether.
with PreserveLoggingContext():
handle_queue_loop()
# set handle_queue_loop off in the background
run_as_background_process("persist_events", handle_queue_loop)
def _get_drainining_queue(self, room_id):
queue = self._event_persist_queues.setdefault(room_id, deque())

View file

@ -25,6 +25,7 @@ from synapse.events import EventBase # noqa: F401
from synapse.events import FrozenEvent
from synapse.events.snapshot import EventContext # noqa: F401
from synapse.events.utils import prune_event
from synapse.metrics.background_process_metrics import run_as_background_process
from synapse.util.logcontext import (
LoggingContext,
PreserveLoggingContext,
@ -322,10 +323,11 @@ class EventsWorkerStore(SQLBaseStore):
should_start = False
if should_start:
with PreserveLoggingContext():
self.runWithConnection(
self._do_fetch
)
run_as_background_process(
"fetch_events",
self.runWithConnection,
self._do_fetch,
)
logger.debug("Loading %d events", len(events))
with PreserveLoggingContext():

View file

@ -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)

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@ -75,6 +75,10 @@ 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))