1 files changed, 92 insertions, 0 deletions
diff --git a/compass-deck/api/exception_handler.py b/compass-deck/api/exception_handler.py
new file mode 100644
index 0000000..67c780e
--- /dev/null
+++ b/compass-deck/api/exception_handler.py
@@ -0,0 +1,92 @@
+# 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)