OpenStack Study: exception.py

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# Copyright 2010 United States Government as represented by the

# Administrator of the National Aeronautics and Space Administration.

# 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.

"""DB related custom exceptions."""

import six

from keystone.openstack.common.gettextutils import _

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class DBError(Exception):

"""Wraps an implementation specific exception."""

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    def __init__(self, inner_exception=None):

        self.inner_exception = inner_exception

        super(DBError, self).__init__(six.text_type(inner_exception))

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class DBDuplicateEntry(DBError):

"""Wraps an implementation specific exception."""

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    def __init__(self, columns=[], inner_exception=None):

        self.columns = columns

        super(DBDuplicateEntry, self).__init__(inner_exception)

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class DBDeadlock(DBError):

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    def __init__(self, inner_exception=None):

        super(DBDeadlock, self).__init__(inner_exception)

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class DBInvalidUnicodeParameter(Exception):

message = _("Invalid Parameter: "

"Unicode is not supported by the current database.")

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class DbMigrationError(DBError):

"""Wraps migration specific exception."""

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    def __init__(self, message=None):

        super(DbMigrationError, self).__init__(message)

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class DBConnectionError(DBError):

"""Wraps connection specific exception."""

pass