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Use errback pattern and catch async failures

This commit is contained in:
Erik Johnston 2018-10-08 13:26:54 +01:00
parent 8164f6daf3
commit 8a1817f0d2
2 changed files with 35 additions and 15 deletions

View file

@ -28,6 +28,7 @@ from synapse.metrics import (
event_processing_loop_room_count,
)
from synapse.metrics.background_process_metrics import run_as_background_process
from synapse.util import make_log_failure_errback
from synapse.util.logcontext import make_deferred_yieldable, run_in_background
from synapse.util.metrics import Measure
@ -112,7 +113,11 @@ class ApplicationServicesHandler(object):
if not self.started_scheduler:
def start_scheduler():
return self.scheduler.start().addErrback(log_failure)
return self.scheduler.start().addErrback(
make_log_failure_errback(
"Application Services Failure",
)
)
run_as_background_process("as_scheduler", start_scheduler)
self.started_scheduler = True

View file

@ -13,7 +13,6 @@
# See the License for the specific language governing permissions and
# limitations under the License.
import functools
import logging
from itertools import islice
@ -67,9 +66,12 @@ class Clock(object):
f(function): The function to call repeatedly.
msec(float): How long to wait between calls in milliseconds.
"""
call = task.LoopingCall(_log_exception_wrapper(f))
call = task.LoopingCall(f)
call.clock = self._reactor
call.start(msec / 1000.0, now=False)
d = call.start(msec / 1000.0, now=False)
d.addErrback(make_log_failure_errback(
"Looping call died", consumeErrors=False,
))
return call
def call_later(self, delay, callback, *args, **kwargs):
@ -112,17 +114,30 @@ def batch_iter(iterable, size):
return iter(lambda: tuple(islice(sourceiter, size)), ())
def _log_exception_wrapper(f):
"""Used to wrap looping calls to log loudly if they get killed
def make_log_failure_errback(msg, consumeErrors=True):
"""Creates a function suitable for passing to `Deferred.addErrback` that
logs any failures that occur.
Args:
msg (str): Message to log
consumeErrors (bool): If true consumes the failure, otherwise passes
on down the callback chain
Returns:
func(Failure)
"""
@functools.wraps(f)
def wrap(*args, **kwargs):
try:
logger.info("Running looping call")
return f(*args, **kwargs)
except: # noqa: E722, as we reraise the exception this is fine.
logger.exception("Looping called died")
raise
def log_failure(failure):
logger.error(
msg,
exc_info=(
failure.type,
failure.value,
failure.getTracebackObject()
)
)
return wrap
if not consumeErrors:
return failure
return log_failure