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# Copyright 2012-2013 OpenStack, LLC.
#
# 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.
#
"""Exception definitions."""
class CommandError(Exception):
pass
class AuthorizationFailure(Exception):
pass
class NoTokenLookupException(Exception):
"""This does not support looking up endpoints from an existing token."""
pass
class EndpointNotFound(Exception):
"""Could not find Service or Region in Service Catalog."""
pass
class UnsupportedVersion(Exception):
"""The user is trying to use an unsupported version of the API"""
pass
class ClientException(Exception):
"""The base exception class for all exceptions this library raises."""
def __init__(self, code, message=None, details=None):
self.code = code
self.message = message or self.__class__.message
self.details = details
def __str__(self):
return "%s (HTTP %s)" % (self.message, self.code)
class BadRequest(ClientException):
"""HTTP 400 - Bad request: you sent some malformed data."""
http_status = 400
message = "Bad request"
class Unauthorized(ClientException):
"""HTTP 401 - Unauthorized: bad credentials."""
http_status = 401
message = "Unauthorized"
class Forbidden(ClientException):
"""HTTP 403 - Forbidden: not authorized to access to this resource."""
http_status = 403
message = "Forbidden"
class NotFound(ClientException):
"""HTTP 404 - Not found"""
http_status = 404
message = "Not found"
class Conflict(ClientException):
"""HTTP 409 - Conflict"""
http_status = 409
message = "Conflict"
class OverLimit(ClientException):
"""HTTP 413 - Over limit: reached the API limits for this time period."""
http_status = 413
message = "Over limit"
# NotImplemented is a python keyword.
class HTTPNotImplemented(ClientException):
"""HTTP 501 - Not Implemented: server does not support this operation."""
http_status = 501
message = "Not Implemented"
# In Python 2.4 Exception is old-style and thus doesn't have a __subclasses__()
# so we can do this:
# _code_map = dict((c.http_status, c)
# for c in ClientException.__subclasses__())
#
# Instead, we have to hardcode it:
_code_map = dict((c.http_status, c) for c in [
BadRequest,
Unauthorized,
Forbidden,
NotFound,
OverLimit,
HTTPNotImplemented
])
def from_response(response, body):
"""Return an instance of a ClientException based on an httplib2 response.
Usage::
resp, body = http.request(...)
if resp.status != 200:
raise exception_from_response(resp, body)
"""
cls = _code_map.get(response.status, ClientException)
if body:
if hasattr(body, 'keys'):
error = body[body.keys()[0]]
message = error.get('message')
details = error.get('details')
else:
# If we didn't get back a properly formed error message we
# probably couldn't communicate with Keystone at all.
message = "Unable to communicate with image service: %s." % body
details = None
return cls(code=response.status, message=message, details=details)
else:
return cls(code=response.status)
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