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Copy patherrorhandler.py
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78 lines (66 loc) · 2.96 KB
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# Copyright 2013 Amazon.com, Inc. or its affiliates. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"). You
# may not use this file except in compliance with the License. A copy of
# the License is located at
#
# http://aws.amazon.com/apache2.0/
#
# or in the "license" file accompanying this file. This file 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 logging
LOG = logging.getLogger(__name__)
class BaseOperationError(Exception):
MSG_TEMPLATE = ("A {error_type} error ({error_code}) occurred "
"when calling the {operation_name} operation: "
"{error_message}")
def __init__(self, error_code, error_message, error_type, operation_name,
http_status_code):
msg = self.MSG_TEMPLATE.format(
error_code=error_code, error_message=error_message,
error_type=error_type, operation_name=operation_name)
super(BaseOperationError, self).__init__(msg)
self.error_code = error_code
self.error_message = error_message
self.error_type = error_type
self.operation_name = operation_name
self.http_status_code = http_status_code
class ClientError(BaseOperationError):
pass
class ServerError(BaseOperationError):
pass
class ErrorHandler(object):
"""
This class is responsible for handling any HTTP errors that occur
when a service operation is called. It is registered for the
``after-call`` event and will have the opportunity to inspect
all operation calls. If the HTTP response contains an error
``status_code`` an appropriate error message will be printed and
the handler will short-circuit all further processing by exiting
with an appropriate error code.
"""
def __call__(self, http_response, parsed, model, **kwargs):
LOG.debug('HTTP Response Code: %d', http_response.status_code)
error_type = None
error_class = None
if http_response.status_code >= 500:
error_type = 'server'
error_class = ServerError
elif http_response.status_code >= 400 or http_response.status_code == 301:
error_type = 'client'
error_class = ClientError
if error_class is not None:
code, message = self._get_error_code_and_message(parsed)
raise error_class(
error_code=code, error_message=message,
error_type=error_type, operation_name=model.name,
http_status_code=http_response.status_code)
def _get_error_code_and_message(self, response):
code = 'Unknown'
message = 'Unknown'
if 'Error' in response:
error = response['Error']
return error.get('Code', code), error.get('Message', message)
return (code, message)