b1f81badfd
Match the requirements for taskflow with the openstack requirements (note the upstream requirements are missing 'futures' and 'networkx') and update the new hacking violations that were detected due to the hacking requirement version bump. Change-Id: I8d1326cf2a8b1ea062f5e9aacd0c4f8261c6531a
124 lines
3.6 KiB
Python
124 lines
3.6 KiB
Python
# -*- coding: utf-8 -*-
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# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright (C) 2012-2013 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 logging
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import os
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import sys
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import time
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logging.basicConfig(level=logging.ERROR)
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top_dir = os.path.abspath(os.path.join(os.path.dirname(__file__),
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os.pardir,
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os.pardir))
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sys.path.insert(0, top_dir)
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import taskflow.engines
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from taskflow import exceptions
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from taskflow.patterns import unordered_flow as uf
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from taskflow import task
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from taskflow.utils import misc
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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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class FirstException(Exception):
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"""Exception that first task raises"""
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class SecondException(Exception):
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"""Exception that second task raises"""
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class FirstTask(task.Task):
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def execute(self, sleep1, raise1):
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time.sleep(sleep1)
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if not isinstance(raise1, bool):
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raise TypeError('Bad raise1 value: %r' % raise1)
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if raise1:
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raise FirstException('First task failed')
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class SecondTask(task.Task):
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def execute(self, sleep2, raise2):
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time.sleep(sleep2)
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if not isinstance(raise2, bool):
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raise TypeError('Bad raise2 value: %r' % raise2)
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if raise2:
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raise SecondException('Second task failed')
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def run(**store):
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flow = uf.Flow('flow').add(
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FirstTask(),
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SecondTask()
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)
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try:
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with wrap_all_failures():
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taskflow.engines.run(flow, store=store,
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engine_conf='parallel')
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except exceptions.WrappedFailure as ex:
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unknown_failures = []
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for failure in ex:
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if failure.check(FirstException):
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print("Got FirstException: %s" % failure.exception_str)
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elif failure.check(SecondException):
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print("Got SecondException: %s" % failure.exception_str)
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else:
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print("Unknown failure: %s" % failure)
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unknown_failures.append(failure)
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misc.Failure.reraise_if_any(unknown_failures)
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print("== Raise and catch first exception only ==")
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run(sleep1=0.0, raise1=True,
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sleep2=0.0, raise2=False)
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print("\n== Raise and catch both exceptions ==")
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# NOTE(imelnikov): in general, sleeping does not guarantee that
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# we'll have both task running before one of them fails, but
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# with current implementation this works most of times,
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# which is enough for our purposes here.
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run(sleep1=1.0, raise1=True,
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sleep2=1.0, raise2=True)
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print("\n== Handle one exception, and re-raise another ==")
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try:
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run(sleep1=1.0, raise1=True,
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sleep2=1.0, raise2='boom')
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except TypeError as ex:
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print("As expected, TypeError is here: %s" % ex)
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else:
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assert False, "TypeError expected"
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