def send_catch_log(signal=Any, sender=Anonymous, *arguments, **named):
"""Like pydispatcher.robust.sendRobust but it also logs errors and returns
Failures instead of exceptions.
"""
dont_log = named.pop('dont_log', None)
spider = named.get('spider', None)
responses = []
for receiver in liveReceivers(getAllReceivers(sender, signal)):
try:
response = robustApply(receiver, signal=signal, sender=sender,
*arguments, **named)
if isinstance(response, Deferred):
log.msg(format="Cannot return deferreds from signal handler: %(receiver)s",
level=log.ERROR, spider=spider, receiver=receiver)
except dont_log:
result = Failure()
except Exception:
result = Failure()
log.err(result, "Error caught on signal handler: %s" % receiver, \
spider=spider)
else:
result = response
responses.append((receiver, result))
return responses
def logerror(failure, recv):
if dont_log is None or not isinstance(failure.value, dont_log):
log.err(failure, "Error caught on signal handler: %s" % recv, \
spider=spider)
return failure
