aea1f401eb
* Added missing period for doc strings * Correct syntax errors * Remove H402 from flake8 ignore list Change-Id: Ia8592bf99378e3658d6cca2ceb148bf9eb0b5de8
135 lines
4.0 KiB
Python
135 lines
4.0 KiB
Python
# -*- coding: utf-8 -*-
|
|
|
|
# vim: tabstop=4 shiftwidth=4 softtabstop=4
|
|
|
|
# Copyright (C) 2012 Yahoo! Inc. All Rights Reserved.
|
|
#
|
|
# Licensed under the Apache License, Version 2.0 (the "License"); you may
|
|
# not use this file except in compliance with the License. You may obtain
|
|
# a copy of the License at
|
|
#
|
|
# http://www.apache.org/licenses/LICENSE-2.0
|
|
#
|
|
# Unless required by applicable law or agreed to in writing, software
|
|
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
|
# License for the specific language governing permissions and limitations
|
|
# under the License.
|
|
|
|
|
|
class TaskFlowException(Exception):
|
|
"""Base class for exceptions emitted from this library."""
|
|
pass
|
|
|
|
|
|
class Duplicate(TaskFlowException):
|
|
"""Raised when a duplicate entry is found."""
|
|
pass
|
|
|
|
|
|
class StorageError(TaskFlowException):
|
|
"""Raised when logbook can not be read/saved/deleted."""
|
|
|
|
def __init__(self, message, cause=None):
|
|
super(StorageError, self).__init__(message)
|
|
self.cause = cause
|
|
|
|
|
|
class NotFound(TaskFlowException):
|
|
"""Raised when some entry in some object doesn't exist."""
|
|
pass
|
|
|
|
|
|
class AlreadyExists(TaskFlowException):
|
|
"""Raised when some entry in some object already exists."""
|
|
pass
|
|
|
|
|
|
class InvalidState(TaskFlowException):
|
|
"""Raised when a task/job/workflow is in an invalid state when an
|
|
operation is attempting to apply to said task/job/workflow.
|
|
"""
|
|
pass
|
|
|
|
|
|
class InvariantViolation(TaskFlowException):
|
|
"""Raised when flow invariant violation is attempted."""
|
|
pass
|
|
|
|
|
|
class UnclaimableJob(TaskFlowException):
|
|
"""Raised when a job can not be claimed."""
|
|
pass
|
|
|
|
|
|
class JobNotFound(TaskFlowException):
|
|
"""Raised when a job entry can not be found."""
|
|
pass
|
|
|
|
|
|
class MissingDependencies(InvariantViolation):
|
|
"""Raised when a entity has dependencies that can not be satisfied."""
|
|
message = ("%(who)s requires %(requirements)s but no other entity produces"
|
|
" said requirements")
|
|
|
|
def __init__(self, who, requirements):
|
|
message = self.message % {'who': who, 'requirements': requirements}
|
|
super(MissingDependencies, self).__init__(message)
|
|
self.missing_requirements = requirements
|
|
|
|
|
|
class DependencyFailure(TaskFlowException):
|
|
"""Raised when flow can't resolve dependency."""
|
|
pass
|
|
|
|
|
|
class EmptyFlow(TaskFlowException):
|
|
"""Raised when flow doesn't contain tasks."""
|
|
pass
|
|
|
|
|
|
class WrappedFailure(TaskFlowException):
|
|
"""Wraps one or several failures.
|
|
|
|
When exception cannot be re-raised (for example, because
|
|
the value and traceback is lost in serialization) or
|
|
there are several exceptions, we wrap corresponding Failure
|
|
objects into this exception class.
|
|
"""
|
|
|
|
def __init__(self, causes):
|
|
self._causes = []
|
|
for cause in causes:
|
|
if cause.check(type(self)) and cause.exception:
|
|
# NOTE(imelnikov): flatten wrapped failures.
|
|
self._causes.extend(cause.exception)
|
|
else:
|
|
self._causes.append(cause)
|
|
|
|
def __iter__(self):
|
|
"""Iterate over failures that caused the exception."""
|
|
return iter(self._causes)
|
|
|
|
def __len__(self):
|
|
"""Return number of wrapped failures."""
|
|
return len(self._causes)
|
|
|
|
def check(self, *exc_classes):
|
|
"""Check if any of exc_classes caused (part of) the failure.
|
|
|
|
Arguments of this method can be exception types or type names
|
|
(stings). If any of wrapped failures were caused by exception
|
|
of given type, the corresponding argument is returned. Else,
|
|
None is returned.
|
|
"""
|
|
if not exc_classes:
|
|
return None
|
|
for cause in self:
|
|
result = cause.check(*exc_classes)
|
|
if result is not None:
|
|
return result
|
|
return None
|
|
|
|
def __str__(self):
|
|
return 'WrappedFailure: %s' % [str(cause) for cause in self._causes]
|