c093858888
There was a variable usage error in that 'exc_infos' does not need to be three and also the exc_info[2] does not need to be not-none if there is no traceback (which is a valid usage/case of exc_info). Change-Id: Iddb979e5cb7df424ee218854e0c766e5b45e3e29
109 lines
3.2 KiB
Python
109 lines
3.2 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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import StringIO
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import traceback
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class TaskFlowException(Exception):
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"""Base class for exceptions emitted from this library."""
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pass
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class Duplicate(TaskFlowException):
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"""Raised when a duplicate entry is found."""
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pass
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class LinkedException(TaskFlowException):
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"""A linked chain of many exceptions."""
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def __init__(self, message, cause, tb):
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super(LinkedException, self).__init__(message)
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self.cause = cause
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self.tb = tb
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self.next = None
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@classmethod
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def link(cls, exc_infos):
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first = None
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previous = None
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for i, exc_info in enumerate(exc_infos):
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if not all(exc_info[0:2]) or len(exc_info) != 3:
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raise ValueError("Invalid exc_info for index %s" % (i))
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buf = StringIO.StringIO()
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traceback.print_exception(exc_info[0], exc_info[1], exc_info[2],
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file=buf)
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exc = cls(str(exc_info[1]), exc_info[1], buf.getvalue())
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if previous is not None:
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previous.next = exc
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else:
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first = exc
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previous = exc
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return first
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class StorageError(TaskFlowException):
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"""Raised when logbook can not be read/saved/deleted."""
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def __init__(self, message, cause=None):
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super(StorageError, self).__init__(message)
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self.cause = cause
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class NotFound(TaskFlowException):
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"""Raised when some entry in some object doesn't exist."""
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pass
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class AlreadyExists(TaskFlowException):
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"""Raised when some entry in some object already exists."""
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pass
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class ClosedException(TaskFlowException):
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"""Raised when an access on a closed object occurs."""
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pass
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class InvalidStateException(TaskFlowException):
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"""Raised when a task/job/workflow is in an invalid state when an
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operation is attempting to apply to said task/job/workflow.
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"""
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pass
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class UnclaimableJobException(TaskFlowException):
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"""Raised when a job can not be claimed."""
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pass
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class JobNotFound(TaskFlowException):
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"""Raised when a job entry can not be found."""
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pass
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class MissingDependencies(InvalidStateException):
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"""Raised when a entity has dependencies that can not be satisified."""
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message = ("%(who)s requires %(requirements)s but no other entity produces"
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" said requirements")
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def __init__(self, who, requirements):
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message = self.message % {'who': who, 'requirements': requirements}
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super(MissingDependencies, self).__init__(message)
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