94 lines
2.5 KiB
Python
94 lines
2.5 KiB
Python
# -*- coding: utf-8 -*-
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# vim: tabstop=4 shiftwidth=4 softtabstop=4
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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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from taskflow import decorators
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from taskflow import task
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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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def close_all(*args):
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for a in args:
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if not a:
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continue
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a.close()
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def null_functor(*args, **kwargs): # pylint: disable=W0613
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return None
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def drain(lst):
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while len(lst):
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lst.pop()
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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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@decorators.task(name='blowup_%s' % token)
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def blow_up(context, *args, **kwargs):
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raise Exception("I blew up")
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return blow_up
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else:
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@decorators.task(revert=do_revert, name='do_apply_%s' % token)
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def do_apply(context, *args, **kwargs):
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context[token] = 'passed'
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return do_apply
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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, context, *args, **kwargs):
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if ORDER_KEY not in context:
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context[ORDER_KEY] = []
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context[ORDER_KEY].append({
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'name': self.name,
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KWARGS_KEY: kwargs,
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ARGS_KEY: args,
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})
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if self.return_tuple:
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outs = []
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for i in xrange(0, len(self.provides)):
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outs.append(i)
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return tuple(outs)
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else:
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outs = {}
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for k in self.provides:
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outs[k] = k
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return outs
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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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