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
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+++ 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)