| # Copyright 2017 gRPC authors. |
| # |
| # 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. |
| """Base class for interceptors that operate on all RPC types.""" |
| |
| import grpc |
| |
| |
| class _GenericClientInterceptor( |
| grpc.UnaryUnaryClientInterceptor, grpc.UnaryStreamClientInterceptor, |
| grpc.StreamUnaryClientInterceptor, grpc.StreamStreamClientInterceptor): |
| |
| def __init__(self, interceptor_function): |
| self._fn = interceptor_function |
| |
| def intercept_unary_unary(self, continuation, client_call_details, request): |
| new_details, new_request_iterator, postprocess = self._fn( |
| client_call_details, iter((request,)), False, False) |
| response = continuation(new_details, next(new_request_iterator)) |
| return postprocess(response) if postprocess else response |
| |
| def intercept_unary_stream(self, continuation, client_call_details, |
| request): |
| new_details, new_request_iterator, postprocess = self._fn( |
| client_call_details, iter((request,)), False, True) |
| response_it = continuation(new_details, next(new_request_iterator)) |
| return postprocess(response_it) if postprocess else response_it |
| |
| def intercept_stream_unary(self, continuation, client_call_details, |
| request_iterator): |
| new_details, new_request_iterator, postprocess = self._fn( |
| client_call_details, request_iterator, True, False) |
| response = continuation(new_details, new_request_iterator) |
| return postprocess(response) if postprocess else response |
| |
| def intercept_stream_stream(self, continuation, client_call_details, |
| request_iterator): |
| new_details, new_request_iterator, postprocess = self._fn( |
| client_call_details, request_iterator, True, True) |
| response_it = continuation(new_details, new_request_iterator) |
| return postprocess(response_it) if postprocess else response_it |
| |
| |
| def create(intercept_call): |
| return _GenericClientInterceptor(intercept_call) |