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56 lines
2.5 KiB
Python
56 lines
2.5 KiB
Python
# Copyright 2017 gRPC authors.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Base class for interceptors that operate on all RPC types."""
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import grpc
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class _GenericClientInterceptor(
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grpc.UnaryUnaryClientInterceptor, grpc.UnaryStreamClientInterceptor,
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grpc.StreamUnaryClientInterceptor, grpc.StreamStreamClientInterceptor):
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def __init__(self, interceptor_function):
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self._fn = interceptor_function
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def intercept_unary_unary(self, continuation, client_call_details, request):
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new_details, new_request_iterator, postprocess = self._fn(
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client_call_details, iter((request,)), False, False)
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response = continuation(new_details, next(new_request_iterator))
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return postprocess(response) if postprocess else response
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def intercept_unary_stream(self, continuation, client_call_details,
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request):
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new_details, new_request_iterator, postprocess = self._fn(
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client_call_details, iter((request,)), False, True)
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response_it = continuation(new_details, next(new_request_iterator))
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return postprocess(response_it) if postprocess else response_it
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def intercept_stream_unary(self, continuation, client_call_details,
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request_iterator):
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new_details, new_request_iterator, postprocess = self._fn(
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client_call_details, request_iterator, True, False)
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response = continuation(new_details, new_request_iterator)
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return postprocess(response) if postprocess else response
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def intercept_stream_stream(self, continuation, client_call_details,
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request_iterator):
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new_details, new_request_iterator, postprocess = self._fn(
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client_call_details, request_iterator, True, True)
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response_it = continuation(new_details, new_request_iterator)
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return postprocess(response_it) if postprocess else response_it
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def create(intercept_call):
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return _GenericClientInterceptor(intercept_call)
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