Brian Waldon
1f44aff399
Add glance.exc.InternalServerError and .ServiceUnavailable to represent HTTP statuses 500 and 503. Users will definitely see these from Glance, so let's be nice and map them to handy exception classes. Change-Id: I8e8fcda532455793ea4d0f08a23f7c92b68c186c
133 lines
2.9 KiB
Python
133 lines
2.9 KiB
Python
"""
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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 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 SchemaNotFound(KeyError):
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"""Could not find schema"""
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pass
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class InvalidEndpoint(ValueError):
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"""The provided endpoint could not be used"""
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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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class InternalServerError(ClientException):
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"""
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HTTP 500 - Internal Server Error
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"""
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http_status = 500
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message = "Internal Server Error"
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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
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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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_exc_list = [BadRequest, Unauthorized, Forbidden, NotFound, OverLimit,
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InternalServerError, HTTPNotImplemented, ServiceUnavailable]
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_code_map = dict((c.http_status, c) for c in _exc_list)
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def from_response(response):
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"""Return an instance of an ClientException based on httplib response."""
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cls = _code_map.get(response.status, ClientException)
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return cls(code=response.status)
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