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Diffstat (limited to 'examples/python/interceptors/headers/generic_client_interceptor.py')
-rw-r--r-- | examples/python/interceptors/headers/generic_client_interceptor.py | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/examples/python/interceptors/headers/generic_client_interceptor.py b/examples/python/interceptors/headers/generic_client_interceptor.py new file mode 100644 index 0000000000..30b0755aaf --- /dev/null +++ b/examples/python/interceptors/headers/generic_client_interceptor.py @@ -0,0 +1,55 @@ +# 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, 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, next(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) |