build python version rag-flow (#21)

* clean rust version project

* clean rust version project

* build python version rag-flow

web_server/errors/__init__.py

@@ -0,0 +1,10 @@
+from .general_error import *
+
+
+class FateFlowError(Exception):
+    message = 'Unknown Fate Flow Error'
+
+    def __init__(self, message=None, *args, **kwargs):
+        message = str(message) if message is not None else self.message
+        message = message.format(*args, **kwargs)
+        super().__init__(message)

web_server/errors/error_services.py

@@ -0,0 +1,13 @@
+from web_server.errors import FateFlowError
+
+__all__ = ['ServicesError', 'ServiceNotSupported', 'ZooKeeperNotConfigured',
+           'MissingZooKeeperUsernameOrPassword', 'ZooKeeperBackendError']
+
+
+class ServicesError(FateFlowError):
+    message = 'Unknown services error'
+
+
+class ServiceNotSupported(ServicesError):
+    message = 'The service {service_name} is not supported'
+

web_server/errors/general_error.py

@@ -0,0 +1,21 @@
+#
+#  Copyright 2019 The FATE Authors. 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.
+#  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.
+#
+class ParameterError(Exception):
+    pass
+
+
+class PassError(Exception):
+    pass