15d134d130
Bug: 1028799 No traceback, if service is unavailable; error out gracefully. * keystoneclient/exceptions.py ServiceUnavailable: New class to handle 503 status code. Add the new class to list of handled exceptions. Change-Id: I39a8ac594ef922d682731a926be26c8b6f648f9d
146 lines
3.7 KiB
Python
146 lines
3.7 KiB
Python
# Copyright 2010 Jacob Kaplan-Moss
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# Copyright 2011 Nebula, Inc.
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"""
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Exception definitions.
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"""
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class CommandError(Exception):
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pass
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class AuthorizationFailure(Exception):
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pass
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class NoTokenLookupException(Exception):
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"""This form of authentication does not support looking up
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endpoints from an existing token."""
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pass
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class EndpointNotFound(Exception):
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"""Could not find Service or Region in Service Catalog."""
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pass
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class ClientException(Exception):
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"""
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The base exception class for all exceptions this library raises.
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"""
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def __init__(self, code, message=None, details=None):
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self.code = code
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self.message = message or self.__class__.message
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self.details = details
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def __str__(self):
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return "%s (HTTP %s)" % (self.message, self.code)
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class BadRequest(ClientException):
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"""
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HTTP 400 - Bad request: you sent some malformed data.
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"""
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http_status = 400
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message = "Bad request"
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class Unauthorized(ClientException):
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"""
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HTTP 401 - Unauthorized: bad credentials.
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"""
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http_status = 401
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message = "Unauthorized"
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class Forbidden(ClientException):
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"""
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HTTP 403 - Forbidden: your credentials don't give you access to this
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resource.
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"""
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http_status = 403
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message = "Forbidden"
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class NotFound(ClientException):
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"""
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HTTP 404 - Not found
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"""
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http_status = 404
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message = "Not found"
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class Conflict(ClientException):
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"""
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HTTP 409 - Conflict
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"""
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http_status = 409
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message = "Conflict"
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class OverLimit(ClientException):
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"""
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HTTP 413 - Over limit: you're over the API limits for this time period.
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"""
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http_status = 413
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message = "Over limit"
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# NotImplemented is a python keyword.
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class HTTPNotImplemented(ClientException):
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"""
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HTTP 501 - Not Implemented: the server does not support this operation.
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"""
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http_status = 501
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message = "Not Implemented"
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class ServiceUnavailable(ClientException):
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"""
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HTTP 503 - Service Unavailable: The server is currently unavailable.
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"""
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http_status = 503
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message = "Service Unavailable"
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# In Python 2.4 Exception is old-style and thus doesn't have a __subclasses__()
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# so we can do this:
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# _code_map = dict((c.http_status, c)
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# for c in ClientException.__subclasses__())
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#
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# Instead, we have to hardcode it:
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_code_map = dict((c.http_status, c) for c in [BadRequest,
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Unauthorized,
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Forbidden,
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NotFound,
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OverLimit,
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HTTPNotImplemented,
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ServiceUnavailable])
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def from_response(response, body):
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"""
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Return an instance of an ClientException or subclass
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based on an httplib2 response.
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Usage::
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resp, body = http.request(...)
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if resp.status != 200:
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raise exception_from_response(resp, body)
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"""
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cls = _code_map.get(response.status, ClientException)
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if body:
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if hasattr(body, 'keys'):
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error = body[body.keys()[0]]
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message = error.get('message', None)
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details = error.get('details', None)
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else:
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# If we didn't get back a properly formed error message we
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# probably couldn't communicate with Keystone at all.
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message = "Unable to communicate with identity service: %s." % body
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details = None
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return cls(code=response.status, message=message, details=details)
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else:
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return cls(code=response.status)
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