460 lines
12 KiB
Python
460 lines
12 KiB
Python
# Copyright 2010 Jacob Kaplan-Moss
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# Copyright 2011 Nebula, Inc.
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# Copyright 2013 Alessio Ababilov
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# Copyright 2013 OpenStack Foundation
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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"""
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Exception definitions.
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"""
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import inspect
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import sys
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class ClientException(Exception):
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"""The base exception class for all exceptions this library raises.
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"""
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pass
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class MissingArgs(ClientException):
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"""Supplied arguments are not sufficient for calling a function."""
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def __init__(self, missing, message=None):
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self.missing = missing
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self.message = message or "Missing argument(s): %s"
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self.message %= ", ".join(missing)
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super(MissingArgs, self).__init__(self.message)
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class ValidationError(ClientException):
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"""Error in validation on API client side."""
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pass
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class UnsupportedVersion(ClientException):
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"""User is trying to use an unsupported version of the API."""
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pass
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class CommandError(ClientException):
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"""Error in CLI tool."""
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pass
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class AuthorizationFailure(ClientException):
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"""Cannot authorize API client."""
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pass
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class ConnectionRefused(ClientException):
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"""Cannot connect to API service."""
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pass
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class AuthPluginOptionsMissing(AuthorizationFailure):
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"""Auth plugin misses some options."""
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def __init__(self, opt_names):
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super(AuthPluginOptionsMissing, self).__init__(
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"Authentication failed. Missing options: %s" %
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", ".join(opt_names))
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self.opt_names = opt_names
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class AuthSystemNotFound(AuthorizationFailure):
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"""User has specified a AuthSystem that is not installed."""
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def __init__(self, auth_system):
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super(AuthSystemNotFound, self).__init__(
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"AuthSystemNotFound: %s" % repr(auth_system))
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self.auth_system = auth_system
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class NoUniqueMatch(ClientException):
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"""Multiple entities found instead of one."""
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pass
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class EndpointException(ClientException):
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"""Something is rotten in Service Catalog."""
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pass
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class EndpointNotFound(EndpointException):
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"""Could not find requested endpoint in Service Catalog."""
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pass
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class AmbiguousEndpoints(EndpointException):
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"""Found more than one matching endpoint in Service Catalog."""
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def __init__(self, endpoints=None):
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super(AmbiguousEndpoints, self).__init__(
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"AmbiguousEndpoints: %s" % repr(endpoints))
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self.endpoints = endpoints
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class HttpError(ClientException):
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"""The base exception class for all HTTP exceptions.
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"""
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http_status = 0
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message = "HTTP Error"
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def __init__(self, message=None, details=None,
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response=None, request_id=None,
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url=None, method=None, http_status=None):
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self.http_status = http_status or self.http_status
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self.message = message or self.message
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self.details = details
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self.request_id = request_id
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self.response = response
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self.url = url
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self.method = method
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formatted_string = "%s (HTTP %s)" % (self.message, self.http_status)
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if request_id:
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formatted_string += " (Request-ID: %s)" % request_id
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super(HttpError, self).__init__(formatted_string)
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class HTTPClientError(HttpError):
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"""Client-side HTTP error.
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Exception for cases in which the client seems to have erred.
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"""
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message = "HTTP Client Error"
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class HttpServerError(HttpError):
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"""Server-side HTTP error.
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Exception for cases in which the server is aware that it has
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erred or is incapable of performing the request.
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"""
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message = "HTTP Server Error"
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class BadRequest(HTTPClientError):
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"""HTTP 400 - Bad Request.
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The request cannot be fulfilled due to bad syntax.
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"""
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http_status = 400
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message = "Bad Request"
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class Unauthorized(HTTPClientError):
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"""HTTP 401 - Unauthorized.
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Similar to 403 Forbidden, but specifically for use when authentication
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is required and has failed or has not yet been provided.
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"""
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http_status = 401
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message = "Unauthorized"
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class PaymentRequired(HTTPClientError):
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"""HTTP 402 - Payment Required.
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Reserved for future use.
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"""
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http_status = 402
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message = "Payment Required"
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class Forbidden(HTTPClientError):
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"""HTTP 403 - Forbidden.
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The request was a valid request, but the server is refusing to respond
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to it.
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"""
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http_status = 403
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message = "Forbidden"
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class NotFound(HTTPClientError):
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"""HTTP 404 - Not Found.
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The requested resource could not be found but may be available again
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in the future.
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"""
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http_status = 404
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message = "Not Found"
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class MethodNotAllowed(HTTPClientError):
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"""HTTP 405 - Method Not Allowed.
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A request was made of a resource using a request method not supported
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by that resource.
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"""
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http_status = 405
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message = "Method Not Allowed"
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class NotAcceptable(HTTPClientError):
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"""HTTP 406 - Not Acceptable.
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The requested resource is only capable of generating content not
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acceptable according to the Accept headers sent in the request.
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"""
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http_status = 406
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message = "Not Acceptable"
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class ProxyAuthenticationRequired(HTTPClientError):
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"""HTTP 407 - Proxy Authentication Required.
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The client must first authenticate itself with the proxy.
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"""
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http_status = 407
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message = "Proxy Authentication Required"
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class RequestTimeout(HTTPClientError):
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"""HTTP 408 - Request Timeout.
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The server timed out waiting for the request.
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"""
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http_status = 408
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message = "Request Timeout"
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class Conflict(HTTPClientError):
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"""HTTP 409 - Conflict.
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Indicates that the request could not be processed because of conflict
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in the request, such as an edit conflict.
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"""
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http_status = 409
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message = "Conflict"
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class Gone(HTTPClientError):
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"""HTTP 410 - Gone.
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Indicates that the resource requested is no longer available and will
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not be available again.
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"""
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http_status = 410
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message = "Gone"
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class LengthRequired(HTTPClientError):
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"""HTTP 411 - Length Required.
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The request did not specify the length of its content, which is
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required by the requested resource.
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"""
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http_status = 411
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message = "Length Required"
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class PreconditionFailed(HTTPClientError):
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"""HTTP 412 - Precondition Failed.
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The server does not meet one of the preconditions that the requester
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put on the request.
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"""
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http_status = 412
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message = "Precondition Failed"
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class RequestEntityTooLarge(HTTPClientError):
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"""HTTP 413 - Request Entity Too Large.
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The request is larger than the server is willing or able to process.
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"""
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http_status = 413
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message = "Request Entity Too Large"
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def __init__(self, *args, **kwargs):
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try:
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self.retry_after = int(kwargs.pop('retry_after'))
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except (KeyError, ValueError):
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self.retry_after = 0
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super(RequestEntityTooLarge, self).__init__(*args, **kwargs)
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class RequestUriTooLong(HTTPClientError):
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"""HTTP 414 - Request-URI Too Long.
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The URI provided was too long for the server to process.
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"""
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http_status = 414
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message = "Request-URI Too Long"
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class UnsupportedMediaType(HTTPClientError):
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"""HTTP 415 - Unsupported Media Type.
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The request entity has a media type which the server or resource does
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not support.
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"""
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http_status = 415
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message = "Unsupported Media Type"
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class RequestedRangeNotSatisfiable(HTTPClientError):
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"""HTTP 416 - Requested Range Not Satisfiable.
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The client has asked for a portion of the file, but the server cannot
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supply that portion.
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"""
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http_status = 416
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message = "Requested Range Not Satisfiable"
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class ExpectationFailed(HTTPClientError):
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"""HTTP 417 - Expectation Failed.
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The server cannot meet the requirements of the Expect request-header field.
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"""
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http_status = 417
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message = "Expectation Failed"
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class UnprocessableEntity(HTTPClientError):
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"""HTTP 422 - Unprocessable Entity.
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The request was well-formed but was unable to be followed due to semantic
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errors.
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"""
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http_status = 422
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message = "Unprocessable Entity"
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class InternalServerError(HttpServerError):
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"""HTTP 500 - Internal Server Error.
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A generic error message, given when no more specific message is suitable.
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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(HttpServerError):
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"""HTTP 501 - Not Implemented.
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The server either does not recognize the request method, or it lacks
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the ability to fulfill the request.
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"""
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http_status = 501
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message = "Not Implemented"
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class BadGateway(HttpServerError):
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"""HTTP 502 - Bad Gateway.
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The server was acting as a gateway or proxy and received an invalid
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response from the upstream server.
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"""
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http_status = 502
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message = "Bad Gateway"
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class ServiceUnavailable(HttpServerError):
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"""HTTP 503 - Service Unavailable.
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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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class GatewayTimeout(HttpServerError):
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"""HTTP 504 - Gateway Timeout.
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The server was acting as a gateway or proxy and did not receive a timely
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response from the upstream server.
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"""
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http_status = 504
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message = "Gateway Timeout"
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class HttpVersionNotSupported(HttpServerError):
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"""HTTP 505 - HttpVersion Not Supported.
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The server does not support the HTTP protocol version used in the request.
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"""
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http_status = 505
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message = "HTTP Version Not Supported"
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# _code_map contains all the classes that have http_status attribute.
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_code_map = dict(
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(getattr(obj, 'http_status', None), obj)
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for name, obj in vars(sys.modules[__name__]).items()
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if inspect.isclass(obj) and getattr(obj, 'http_status', False)
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)
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def from_response(response, method, url):
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"""Returns an instance of :class:`HttpError` or subclass based on response.
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:param response: instance of `requests.Response` class
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:param method: HTTP method used for request
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:param url: URL used for request
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"""
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kwargs = {
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"http_status": response.status_code,
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"response": response,
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"method": method,
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"url": url,
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"request_id": response.headers.get("x-compute-request-id"),
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}
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if "retry-after" in response.headers:
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kwargs["retry_after"] = response.headers["retry-after"]
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content_type = response.headers.get("Content-Type", "")
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if content_type.startswith("application/json"):
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try:
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body = response.json()
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except ValueError:
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pass
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else:
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if hasattr(body, 'keys'):
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# NOTE(mriedem): WebOb<1.6.0 will return a nested dict
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# structure where the error keys to the
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# message/details/code. WebOb>=1.6.0 returns just a response
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# body as a single dict, not nested, so we have to handle
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# both cases (since we can't trust what we're given with
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# content_type: application/json either way.
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if 'message' in body:
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# WebOb 1.6.0 case
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message = body.get('message')
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details = body.get('details')
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else:
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# WebOb<1.6.0 where we assume there is a single error
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# message key to the body that has the message and details.
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error = list(body.values())[0]
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message = error.get("message")
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details = error.get("details")
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kwargs["message"] = message
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kwargs["details"] = details
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elif content_type.startswith("text/"):
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kwargs["details"] = response.text
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try:
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cls = _code_map[response.status_code]
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except KeyError:
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if 500 <= response.status_code < 600:
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cls = HttpServerError
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elif 400 <= response.status_code < 500:
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cls = HTTPClientError
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else:
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cls = HttpError
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return cls(**kwargs)
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