339 lines
8.1 KiB
Python
339 lines
8.1 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright (C) 2012 Yahoo! Inc. All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import contextlib
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import collections
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import six
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import threading
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from taskflow import exceptions
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from taskflow.persistence.backends import impl_memory
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from taskflow import retry
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from taskflow import task
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from taskflow.utils import misc
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ARGS_KEY = '__args__'
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KWARGS_KEY = '__kwargs__'
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ORDER_KEY = '__order__'
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@contextlib.contextmanager
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def wrap_all_failures():
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"""Convert any exceptions to WrappedFailure.
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When you expect several failures, it may be convenient
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to wrap any exception with WrappedFailure in order to
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unify error handling.
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"""
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try:
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yield
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except Exception:
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raise exceptions.WrappedFailure([misc.Failure()])
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def make_reverting_task(token, blowup=False):
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def do_revert(context, *args, **kwargs):
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context[token] = 'reverted'
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if blowup:
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def blow_up(context, *args, **kwargs):
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raise RuntimeError("I blew up")
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return task.FunctorTask(blow_up, name='blowup_%s' % token)
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else:
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def do_apply(context, *args, **kwargs):
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context[token] = 'passed'
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return task.FunctorTask(do_apply, revert=do_revert,
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name='do_apply_%s' % token)
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class DummyTask(task.Task):
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def execute(self, context, *args, **kwargs):
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pass
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class FakeTask(object):
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def execute(self, **kwargs):
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pass
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if six.PY3:
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RUNTIME_ERROR_CLASSES = ['RuntimeError', 'Exception',
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'BaseException', 'object']
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else:
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RUNTIME_ERROR_CLASSES = ['RuntimeError', 'StandardError', 'Exception',
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'BaseException', 'object']
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class ProvidesRequiresTask(task.Task):
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def __init__(self, name, provides, requires, return_tuple=True):
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super(ProvidesRequiresTask, self).__init__(name=name,
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provides=provides,
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requires=requires)
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self.return_tuple = isinstance(provides, (tuple, list))
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def execute(self, *args, **kwargs):
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if self.return_tuple:
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return tuple(range(len(self.provides)))
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else:
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return dict((k, k) for k in self.provides)
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def task_callback(state, values, details):
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name = details.get('task_name', None)
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if not name:
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name = details.get('retry_name', '<unknown>')
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values.append('%s %s' % (name, state))
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def flow_callback(state, values, details):
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values.append('flow %s' % state)
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def register_notifiers(engine, values):
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engine.notifier.register('*', flow_callback, kwargs={'values': values})
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engine.task_notifier.register('*', task_callback,
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kwargs={'values': values})
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class SaveOrderTask(task.Task):
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def __init__(self, name=None, *args, **kwargs):
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super(SaveOrderTask, self).__init__(name=name, *args, **kwargs)
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self.values = EngineTestBase.values
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def execute(self, **kwargs):
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self.update_progress(0.0)
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self.values.append(self.name)
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self.update_progress(1.0)
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return 5
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def revert(self, **kwargs):
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self.update_progress(0)
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self.values.append(self.name + ' reverted(%s)'
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% kwargs.get('result'))
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self.update_progress(1.0)
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class FailingTask(SaveOrderTask):
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def execute(self, **kwargs):
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self.update_progress(0)
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self.update_progress(0.99)
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raise RuntimeError('Woot!')
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class TaskWithFailure(task.Task):
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def execute(self, **kwargs):
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raise RuntimeError('Woot!')
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class ProgressingTask(task.Task):
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def execute(self, *args, **kwargs):
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self.update_progress(0.0)
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self.update_progress(1.0)
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return 5
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class FailingTaskWithOneArg(SaveOrderTask):
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def execute(self, x, **kwargs):
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raise RuntimeError('Woot with %s' % x)
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class NastyTask(task.Task):
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def execute(self, **kwargs):
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pass
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def revert(self, **kwargs):
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raise RuntimeError('Gotcha!')
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class NastyFailingTask(NastyTask):
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def execute(self, **kwargs):
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raise RuntimeError('Woot!')
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class TaskNoRequiresNoReturns(task.Task):
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def execute(self, **kwargs):
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pass
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def revert(self, **kwargs):
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pass
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class TaskOneArg(task.Task):
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def execute(self, x, **kwargs):
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pass
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def revert(self, x, **kwargs):
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pass
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class TaskMultiArg(task.Task):
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def execute(self, x, y, z, **kwargs):
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pass
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def revert(self, x, y, z, **kwargs):
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pass
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class TaskOneReturn(task.Task):
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def execute(self, **kwargs):
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return 1
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def revert(self, **kwargs):
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pass
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class TaskMultiReturn(task.Task):
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def execute(self, **kwargs):
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return 1, 3, 5
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def revert(self, **kwargs):
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pass
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class TaskOneArgOneReturn(task.Task):
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def execute(self, x, **kwargs):
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return 1
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def revert(self, x, **kwargs):
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pass
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class TaskMultiArgOneReturn(task.Task):
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def execute(self, x, y, z, **kwargs):
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return x + y + z
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def revert(self, x, y, z, **kwargs):
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pass
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class TaskMultiArgMultiReturn(task.Task):
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def execute(self, x, y, z, **kwargs):
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return 1, 3, 5
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def revert(self, x, y, z, **kwargs):
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pass
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class TaskMultiDict(task.Task):
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def execute(self):
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output = {}
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for i, k in enumerate(sorted(self.provides)):
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output[k] = i
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return output
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class NeverRunningTask(task.Task):
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def execute(self, **kwargs):
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assert False, 'This method should not be called'
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def revert(self, **kwargs):
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assert False, 'This method should not be called'
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class EngineTestBase(object):
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values = None
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def setUp(self):
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super(EngineTestBase, self).setUp()
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EngineTestBase.values = []
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self.backend = impl_memory.MemoryBackend(conf={})
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def tearDown(self):
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EngineTestBase.values = None
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with contextlib.closing(self.backend) as be:
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with contextlib.closing(be.get_connection()) as conn:
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conn.clear_all()
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super(EngineTestBase, self).tearDown()
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def _make_engine(self, flow, flow_detail=None):
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raise NotImplementedError()
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class FailureMatcher(object):
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"""Needed for failure objects comparison."""
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def __init__(self, failure):
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self._failure = failure
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def __repr__(self):
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return str(self._failure)
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def __eq__(self, other):
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return self._failure.matches(other)
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class OneReturnRetry(retry.AlwaysRevert):
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def execute(self, **kwargs):
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return 1
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def revert(self, **kwargs):
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pass
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class ConditionalTask(SaveOrderTask):
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def execute(self, x, y):
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super(ConditionalTask, self).execute()
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if x != y:
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raise RuntimeError('Woot!')
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class WaitForOneFromTask(SaveOrderTask):
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def __init__(self, name, wait_for, wait_states, **kwargs):
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super(WaitForOneFromTask, self).__init__(name, **kwargs)
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if not isinstance(wait_for, collections.Iterable):
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self.wait_for = [wait_for]
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else:
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self.wait_for = wait_for
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if not isinstance(wait_states, collections.Iterable):
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self.wait_states = [wait_states]
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else:
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self.wait_states = wait_states
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self.event = threading.Event()
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def execute(self):
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self.event.wait()
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return super(WaitForOneFromTask, self).execute()
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def callback(self, state, details):
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name = details.get('task_name', None)
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if name not in self.wait_for or state not in self.wait_states:
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return
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self.event.set()
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