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# 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.
import json
import sys
class BaseException(Exception):
"""An error occurred."""
def __init__(self, message=None):
self.message = message
def __str__(self):
return self.message or self.__class__.__doc__
class CommandError(BaseException):
"""Invalid usage of CLI."""
class InvalidEndpoint(BaseException):
"""The provided endpoint is invalid."""
class CommunicationError(BaseException):
"""Unable to communicate with server."""
class HTTPException(BaseException):
"""Base exception for all HTTP-derived exceptions."""
code = 'N/A'
def __init__(self, details=None):
self.details = details
def __str__(self):
message = ""
if self.details:
message = self.details
try:
data = json.loads(self.details)
message = data.get("error_message", "")
if isinstance(message, dict) and "faultstring" in message:
message = "ERROR %s" % message["faultstring"]
except (ValueError, TypeError, AttributeError):
pass
if message:
message = " %s" % message
return "%s (HTTP %s)%s" % (self.__class__.__name__, self.code,
message)
class HTTPMultipleChoices(HTTPException):
code = 300
def __str__(self):
self.details = ("Requested version of OpenStack Images API is not"
"available.")
return "%s (HTTP %s) %s" % (self.__class__.__name__, self.code,
self.details)
class HTTPBadRequest(HTTPException):
code = 400
class HTTPUnauthorized(HTTPException):
code = 401
class HTTPForbidden(HTTPException):
code = 403
class HTTPNotFound(HTTPException):
code = 404
class HTTPMethodNotAllowed(HTTPException):
code = 405
class HTTPConflict(HTTPException):
code = 409
class HTTPOverLimit(HTTPException):
code = 413
class HTTPInternalServerError(HTTPException):
code = 500
class HTTPNotImplemented(HTTPException):
code = 501
class HTTPBadGateway(HTTPException):
code = 502
class HTTPServiceUnavailable(HTTPException):
code = 503
# NOTE(bcwaldon): Build a mapping of HTTP codes to corresponding exception
# classes
_code_map = {}
for obj_name in dir(sys.modules[__name__]):
if obj_name.startswith('HTTP'):
obj = getattr(sys.modules[__name__], obj_name)
_code_map[obj.code] = obj
def from_response(response, details=None):
"""Return an instance of an HTTPException based on http response."""
if hasattr(response, "status"):
# it is response from HTTPClient (httplib)
code = response.status
elif hasattr(response, "status_code"):
# it is response from SessionClient (requests)
code = response.status_code
else:
# it is something unexpected
raise TypeError("Function 'from_response' expects only response object"
" from httplib or requests libraries.")
cls = _code_map.get(code)
if cls is None:
exc = HTTPException(details)
exc.code = code
return exc
else:
return cls(details)
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