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taskhandler suppress cancel error

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Added an errback to handle errors within task handler's deferred instance.
Without this instances of deferred cause a traceback when a deferred is canceled without errback or callback having been called.
This traceback does not end execution, and ultimately would only show to main console.
Reference cancel: https://github.com/twisted/twisted/blob/trunk/src/twisted/internet/defer.py

All evennia unit tests pass.
This commit is contained in:
davewiththenicehat 2021-04-16 10:55:24 -04:00
parent 1a18b247e2
commit c7bf773605
2 changed files with 22 additions and 2 deletions
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16
evennia/scripts/taskhandler.py
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@ -6,6 +6,7 @@ from datetime import datetime, timedelta
from twisted.internet import reactor
from twisted.internet.task import deferLater
from twisted.internet.defer import CancelledError as DefCancelledError
from evennia.server.models import ServerConfig
from evennia.utils.logger import log_err
from evennia.utils.dbserialize import dbserialize, dbunserialize
@ -13,6 +14,17 @@ from evennia.utils.dbserialize import dbserialize, dbunserialize
TASK_HANDLER = None
def handle_error(*args, **kwargs):
"""
Handle errors withing deferred objects.
"""
for arg in args:
# suppress cancel errors
if arg.type == DefCancelledError:
continue
raise arg
class TaskHandler(object):
"""
@ -179,7 +191,9 @@ class TaskHandler(object):
deferLater(self.clock, timedelay, callback, *args, **kwargs)
return task_id
return deferLater(self.clock, timedelay, callback, *args, **kwargs)
d = deferLater(self.clock, timedelay, callback, *args, **kwargs)
d.addErrback(handle_error)
return d
def remove(self, task_id):
"""Remove a persistent task without executing it.

8
evennia/utils/tests/test_utils.py
View file

@ -10,7 +10,7 @@ import mock
from django.test import TestCase
from datetime import datetime
from twisted.internet import task, reactor
from twisted.internet import task
from evennia.utils.ansi import ANSIString
from evennia.utils import utils
@ -338,3 +338,9 @@ class TestDelay(EvenniaTest):
_TASK_HANDLER.clock.advance(1) # make time pass
self.assertEqual(self.char1.ndb.dummy_var, 'dummy_func ran')
self.char1.ndb.dummy_var = False
# test canceling a deferral.
deferal_inst = utils.delay(1, dummy_func, self.char1.dbref)
deferal_inst.cancel()
_TASK_HANDLER.clock.advance(1) # make time pass
self.assertEqual(self.char1.ndb.dummy_var, False)
self.char1.ndb.dummy_var = False