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-rw-r--r--compass-deck/api/exception_handler.py92
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+# Copyright 2014 Huawei Technologies Co. Ltd
+#
+# 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.
+
+"""Exceptions for RESTful API."""
+import logging
+import simplejson as json
+import traceback
+
+from compass.api import app
+from compass.api import utils
+
+
+class HTTPException(Exception):
+ def __init__(self, message, status_code):
+ super(HTTPException, self).__init__(message)
+ self.traceback = traceback.format_exc()
+ self.status_code = status_code
+
+ def to_dict(self):
+ return {'message': str(self)}
+
+
+class ItemNotFound(HTTPException):
+ """Define the exception for referring non-existing object."""
+ def __init__(self, message):
+ super(ItemNotFound, self).__init__(message, 410)
+
+
+class BadRequest(HTTPException):
+ """Define the exception for invalid/missing parameters.
+
+ User making a request in invalid state cannot be processed.
+ """
+ def __init__(self, message):
+ super(BadRequest, self).__init__(message, 400)
+
+
+class Unauthorized(HTTPException):
+ """Define the exception for invalid user login."""
+ def __init__(self, message):
+ super(Unauthorized, self).__init__(message, 401)
+
+
+class UserDisabled(HTTPException):
+ """Define the exception for disabled users."""
+ def __init__(self, message):
+ super(UserDisabled, self).__init__(message, 403)
+
+
+class Forbidden(HTTPException):
+ """Define the exception for invalid permissions."""
+ def __init__(self, message):
+ super(Forbidden, self).__init__(message, 403)
+
+
+class BadMethod(HTTPException):
+ """Define the exception for invoking unsupported methods."""
+ def __init__(self, message):
+ super(BadMethod, self).__init__(message, 405)
+
+
+class ConflictObject(HTTPException):
+ """Define the exception for creating an existing object."""
+ def __init__(self, message):
+ super(ConflictObject, self).__init__(message, 409)
+
+
+@app.errorhandler(Exception)
+def handle_exception(error):
+ if hasattr(error, 'to_dict'):
+ response = error.to_dict()
+ else:
+ response = {'message': str(error)}
+ if app.debug and hasattr(error, 'traceback'):
+ response['traceback'] = error.traceback
+
+ status_code = 400
+ if hasattr(error, 'status_code'):
+ status_code = error.status_code
+
+ return utils.make_json_response(status_code, response)