Add Delegating Channel

BUILD

@@ -2172,6 +2172,7 @@ grpc_cc_library(
         "include/grpcpp/impl/codegen/config.h",
         "include/grpcpp/impl/codegen/core_codegen_interface.h",
         "include/grpcpp/impl/codegen/create_auth_context.h",
+        "include/grpcpp/impl/codegen/delegating_channel.h",        
         "include/grpcpp/impl/codegen/grpc_library.h",
         "include/grpcpp/impl/codegen/intercepted_channel.h",
         "include/grpcpp/impl/codegen/interceptor.h",

BUILD.gn

@@ -1065,6 +1065,7 @@ config("grpc_config") {
         "include/grpcpp/impl/codegen/core_codegen.h",
         "include/grpcpp/impl/codegen/core_codegen_interface.h",
         "include/grpcpp/impl/codegen/create_auth_context.h",
+        "include/grpcpp/impl/codegen/delegating_channel.h",
         "include/grpcpp/impl/codegen/grpc_library.h",
         "include/grpcpp/impl/codegen/intercepted_channel.h",
         "include/grpcpp/impl/codegen/interceptor.h",

CMakeLists.txt

@@ -630,6 +630,7 @@ add_dependencies(buildtests_cxx cxx_byte_buffer_test)
 add_dependencies(buildtests_cxx cxx_slice_test)
 add_dependencies(buildtests_cxx cxx_string_ref_test)
 add_dependencies(buildtests_cxx cxx_time_test)
+add_dependencies(buildtests_cxx delegating_channel_test)
 add_dependencies(buildtests_cxx end2end_test)
 add_dependencies(buildtests_cxx error_details_test)
 add_dependencies(buildtests_cxx exception_test)
@@ -3321,6 +3322,7 @@ foreach(_hdr
   include/grpcpp/impl/codegen/config.h
   include/grpcpp/impl/codegen/core_codegen_interface.h
   include/grpcpp/impl/codegen/create_auth_context.h
+  include/grpcpp/impl/codegen/delegating_channel.h
   include/grpcpp/impl/codegen/grpc_library.h
   include/grpcpp/impl/codegen/intercepted_channel.h
   include/grpcpp/impl/codegen/interceptor.h
@@ -3940,6 +3942,7 @@ foreach(_hdr
   include/grpcpp/impl/codegen/config.h
   include/grpcpp/impl/codegen/core_codegen_interface.h
   include/grpcpp/impl/codegen/create_auth_context.h
+  include/grpcpp/impl/codegen/delegating_channel.h
   include/grpcpp/impl/codegen/grpc_library.h
   include/grpcpp/impl/codegen/intercepted_channel.h
   include/grpcpp/impl/codegen/interceptor.h
@@ -4375,6 +4378,7 @@ foreach(_hdr
   include/grpcpp/impl/codegen/config.h
   include/grpcpp/impl/codegen/core_codegen_interface.h
   include/grpcpp/impl/codegen/create_auth_context.h
+  include/grpcpp/impl/codegen/delegating_channel.h
   include/grpcpp/impl/codegen/grpc_library.h
   include/grpcpp/impl/codegen/intercepted_channel.h
   include/grpcpp/impl/codegen/interceptor.h
@@ -4574,6 +4578,7 @@ foreach(_hdr
   include/grpcpp/impl/codegen/config.h
   include/grpcpp/impl/codegen/core_codegen_interface.h
   include/grpcpp/impl/codegen/create_auth_context.h
+  include/grpcpp/impl/codegen/delegating_channel.h
   include/grpcpp/impl/codegen/grpc_library.h
   include/grpcpp/impl/codegen/intercepted_channel.h
   include/grpcpp/impl/codegen/interceptor.h
@@ -4933,6 +4938,7 @@ foreach(_hdr
   include/grpcpp/impl/codegen/config.h
   include/grpcpp/impl/codegen/core_codegen_interface.h
   include/grpcpp/impl/codegen/create_auth_context.h
+  include/grpcpp/impl/codegen/delegating_channel.h
   include/grpcpp/impl/codegen/grpc_library.h
   include/grpcpp/impl/codegen/intercepted_channel.h
   include/grpcpp/impl/codegen/interceptor.h
@@ -13456,6 +13462,46 @@ target_link_libraries(cxx_time_test
 )
 
 
+endif (gRPC_BUILD_TESTS)
+if (gRPC_BUILD_TESTS)
+
+add_executable(delegating_channel_test
+  test/cpp/end2end/delegating_channel_test.cc
+  third_party/googletest/googletest/src/gtest-all.cc
+  third_party/googletest/googlemock/src/gmock-all.cc
+)
+
+
+target_include_directories(delegating_channel_test
+  PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}
+  PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/include
+  PRIVATE ${_gRPC_SSL_INCLUDE_DIR}
+  PRIVATE ${_gRPC_PROTOBUF_INCLUDE_DIR}
+  PRIVATE ${_gRPC_ZLIB_INCLUDE_DIR}
+  PRIVATE ${_gRPC_BENCHMARK_INCLUDE_DIR}
+  PRIVATE ${_gRPC_CARES_INCLUDE_DIR}
+  PRIVATE ${_gRPC_GFLAGS_INCLUDE_DIR}
+  PRIVATE ${_gRPC_ADDRESS_SORTING_INCLUDE_DIR}
+  PRIVATE ${_gRPC_NANOPB_INCLUDE_DIR}
+  PRIVATE third_party/googletest/googletest/include
+  PRIVATE third_party/googletest/googletest
+  PRIVATE third_party/googletest/googlemock/include
+  PRIVATE third_party/googletest/googlemock
+  PRIVATE ${_gRPC_PROTO_GENS_DIR}
+)
+
+target_link_libraries(delegating_channel_test
+  ${_gRPC_PROTOBUF_LIBRARIES}
+  ${_gRPC_ALLTARGETS_LIBRARIES}
+  grpc++_test_util
+  grpc_test_util
+  grpc++
+  grpc
+  gpr
+  ${_gRPC_GFLAGS_LIBRARIES}
+)
+
+
 endif (gRPC_BUILD_TESTS)
 if (gRPC_BUILD_TESTS)
 

Makefile

@@ -1203,6 +1203,7 @@ cxx_byte_buffer_test: $(BINDIR)/$(CONFIG)/cxx_byte_buffer_test
 cxx_slice_test: $(BINDIR)/$(CONFIG)/cxx_slice_test
 cxx_string_ref_test: $(BINDIR)/$(CONFIG)/cxx_string_ref_test
 cxx_time_test: $(BINDIR)/$(CONFIG)/cxx_time_test
+delegating_channel_test: $(BINDIR)/$(CONFIG)/delegating_channel_test
 end2end_test: $(BINDIR)/$(CONFIG)/end2end_test
 error_details_test: $(BINDIR)/$(CONFIG)/error_details_test
 exception_test: $(BINDIR)/$(CONFIG)/exception_test
@@ -1685,6 +1686,7 @@ buildtests_cxx: privatelibs_cxx \
   $(BINDIR)/$(CONFIG)/cxx_slice_test \
   $(BINDIR)/$(CONFIG)/cxx_string_ref_test \
   $(BINDIR)/$(CONFIG)/cxx_time_test \
+  $(BINDIR)/$(CONFIG)/delegating_channel_test \
   $(BINDIR)/$(CONFIG)/end2end_test \
   $(BINDIR)/$(CONFIG)/error_details_test \
   $(BINDIR)/$(CONFIG)/exception_test \
@@ -1835,6 +1837,7 @@ buildtests_cxx: privatelibs_cxx \
   $(BINDIR)/$(CONFIG)/cxx_slice_test \
   $(BINDIR)/$(CONFIG)/cxx_string_ref_test \
   $(BINDIR)/$(CONFIG)/cxx_time_test \
+  $(BINDIR)/$(CONFIG)/delegating_channel_test \
   $(BINDIR)/$(CONFIG)/end2end_test \
   $(BINDIR)/$(CONFIG)/error_details_test \
   $(BINDIR)/$(CONFIG)/exception_test \
@@ -2330,6 +2333,8 @@ test_cxx: buildtests_cxx
 	$(Q) $(BINDIR)/$(CONFIG)/cxx_string_ref_test || ( echo test cxx_string_ref_test failed ; exit 1 )
 	$(E) "[RUN]     Testing cxx_time_test"
 	$(Q) $(BINDIR)/$(CONFIG)/cxx_time_test || ( echo test cxx_time_test failed ; exit 1 )
+	$(E) "[RUN]     Testing delegating_channel_test"
+	$(Q) $(BINDIR)/$(CONFIG)/delegating_channel_test || ( echo test delegating_channel_test failed ; exit 1 )
 	$(E) "[RUN]     Testing end2end_test"
 	$(Q) $(BINDIR)/$(CONFIG)/end2end_test || ( echo test end2end_test failed ; exit 1 )
 	$(E) "[RUN]     Testing error_details_test"
@@ -5678,6 +5683,7 @@ PUBLIC_HEADERS_CXX += \
     include/grpcpp/impl/codegen/config.h \
     include/grpcpp/impl/codegen/core_codegen_interface.h \
     include/grpcpp/impl/codegen/create_auth_context.h \
+    include/grpcpp/impl/codegen/delegating_channel.h \
     include/grpcpp/impl/codegen/grpc_library.h \
     include/grpcpp/impl/codegen/intercepted_channel.h \
     include/grpcpp/impl/codegen/interceptor.h \
@@ -6305,6 +6311,7 @@ PUBLIC_HEADERS_CXX += \
     include/grpcpp/impl/codegen/config.h \
     include/grpcpp/impl/codegen/core_codegen_interface.h \
     include/grpcpp/impl/codegen/create_auth_context.h \
+    include/grpcpp/impl/codegen/delegating_channel.h \
     include/grpcpp/impl/codegen/grpc_library.h \
     include/grpcpp/impl/codegen/intercepted_channel.h \
     include/grpcpp/impl/codegen/interceptor.h \
@@ -6712,6 +6719,7 @@ PUBLIC_HEADERS_CXX += \
     include/grpcpp/impl/codegen/config.h \
     include/grpcpp/impl/codegen/core_codegen_interface.h \
     include/grpcpp/impl/codegen/create_auth_context.h \
+    include/grpcpp/impl/codegen/delegating_channel.h \
     include/grpcpp/impl/codegen/grpc_library.h \
     include/grpcpp/impl/codegen/intercepted_channel.h \
     include/grpcpp/impl/codegen/interceptor.h \
@@ -6882,6 +6890,7 @@ PUBLIC_HEADERS_CXX += \
     include/grpcpp/impl/codegen/config.h \
     include/grpcpp/impl/codegen/core_codegen_interface.h \
     include/grpcpp/impl/codegen/create_auth_context.h \
+    include/grpcpp/impl/codegen/delegating_channel.h \
     include/grpcpp/impl/codegen/grpc_library.h \
     include/grpcpp/impl/codegen/intercepted_channel.h \
     include/grpcpp/impl/codegen/interceptor.h \
@@ -7247,6 +7256,7 @@ PUBLIC_HEADERS_CXX += \
     include/grpcpp/impl/codegen/config.h \
     include/grpcpp/impl/codegen/core_codegen_interface.h \
     include/grpcpp/impl/codegen/create_auth_context.h \
+    include/grpcpp/impl/codegen/delegating_channel.h \
     include/grpcpp/impl/codegen/grpc_library.h \
     include/grpcpp/impl/codegen/intercepted_channel.h \
     include/grpcpp/impl/codegen/interceptor.h \
@@ -16420,6 +16430,49 @@ endif
 endif
 
 
+DELEGATING_CHANNEL_TEST_SRC = \
+    test/cpp/end2end/delegating_channel_test.cc \
+
+DELEGATING_CHANNEL_TEST_OBJS = $(addprefix $(OBJDIR)/$(CONFIG)/, $(addsuffix .o, $(basename $(DELEGATING_CHANNEL_TEST_SRC))))
+ifeq ($(NO_SECURE),true)
+
+# You can't build secure targets if you don't have OpenSSL.
+
+$(BINDIR)/$(CONFIG)/delegating_channel_test: openssl_dep_error
+
+else
+
+
+
+
+ifeq ($(NO_PROTOBUF),true)
+
+# You can't build the protoc plugins or protobuf-enabled targets if you don't have protobuf 3.5.0+.
+
+$(BINDIR)/$(CONFIG)/delegating_channel_test: protobuf_dep_error
+
+else
+
+$(BINDIR)/$(CONFIG)/delegating_channel_test: $(PROTOBUF_DEP) $(DELEGATING_CHANNEL_TEST_OBJS) $(LIBDIR)/$(CONFIG)/libgrpc++_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc++.a $(LIBDIR)/$(CONFIG)/libgrpc.a $(LIBDIR)/$(CONFIG)/libgpr.a
+	$(E) "[LD]      Linking $@"
+	$(Q) mkdir -p `dirname $@`
+	$(Q) $(LDXX) $(LDFLAGS) $(DELEGATING_CHANNEL_TEST_OBJS) $(LIBDIR)/$(CONFIG)/libgrpc++_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc++.a $(LIBDIR)/$(CONFIG)/libgrpc.a $(LIBDIR)/$(CONFIG)/libgpr.a $(LDLIBSXX) $(LDLIBS_PROTOBUF) $(LDLIBS) $(LDLIBS_SECURE) $(GTEST_LIB) -o $(BINDIR)/$(CONFIG)/delegating_channel_test
+
+endif
+
+endif
+
+$(OBJDIR)/$(CONFIG)/test/cpp/end2end/delegating_channel_test.o:  $(LIBDIR)/$(CONFIG)/libgrpc++_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc++.a $(LIBDIR)/$(CONFIG)/libgrpc.a $(LIBDIR)/$(CONFIG)/libgpr.a
+
+deps_delegating_channel_test: $(DELEGATING_CHANNEL_TEST_OBJS:.o=.dep)
+
+ifneq ($(NO_SECURE),true)
+ifneq ($(NO_DEPS),true)
+-include $(DELEGATING_CHANNEL_TEST_OBJS:.o=.dep)
+endif
+endif
+
+
 END2END_TEST_SRC = \
     test/cpp/end2end/end2end_test.cc \
     test/cpp/end2end/interceptors_util.cc \

build.yaml

@@ -1268,6 +1268,7 @@ filegroups:
   - include/grpcpp/impl/codegen/config.h
   - include/grpcpp/impl/codegen/core_codegen_interface.h
   - include/grpcpp/impl/codegen/create_auth_context.h
+  - include/grpcpp/impl/codegen/delegating_channel.h
   - include/grpcpp/impl/codegen/grpc_library.h
   - include/grpcpp/impl/codegen/intercepted_channel.h
   - include/grpcpp/impl/codegen/interceptor.h
@@ -4758,6 +4759,18 @@ targets:
   - grpc
   - gpr
   uses_polling: false
+- name: delegating_channel_test
+  gtest: true
+  build: test
+  language: c++
+  src:
+  - test/cpp/end2end/delegating_channel_test.cc
+  deps:
+  - grpc++_test_util
+  - grpc_test_util
+  - grpc++
+  - grpc
+  - gpr
 - name: end2end_test
   gtest: true
   cpu_cost: 0.5

gRPC-C++.podspec

@@ -169,6 +169,7 @@ Pod::Spec.new do |s|
                       'include/grpcpp/impl/codegen/config.h',
                       'include/grpcpp/impl/codegen/core_codegen_interface.h',
                       'include/grpcpp/impl/codegen/create_auth_context.h',
+                      'include/grpcpp/impl/codegen/delegating_channel.h',
                       'include/grpcpp/impl/codegen/grpc_library.h',
                       'include/grpcpp/impl/codegen/intercepted_channel.h',
                       'include/grpcpp/impl/codegen/interceptor.h',

include/grpcpp/impl/codegen/channel_interface.h

@@ -62,6 +62,7 @@ class ClientCallbackReaderFactory;
 template <class W>
 class ClientCallbackWriterFactory;
 class ClientCallbackUnaryFactory;
+class DelegatingChannel;
 class InterceptedChannel;
 }  // namespace internal
 
@@ -127,6 +128,7 @@ class ChannelInterface {
   template <class InputMessage, class OutputMessage>
   friend class ::grpc::internal::CallbackUnaryCallImpl;
   friend class ::grpc::internal::RpcMethod;
+  friend class ::grpc::internal::DelegatingChannel;
   friend class ::grpc::internal::InterceptedChannel;
   virtual internal::Call CreateCall(const internal::RpcMethod& method,
                                     ClientContext* context,

include/grpcpp/impl/codegen/delegating_channel.h

@@ -0,0 +1,87 @@
+/*
+ *
+ * Copyright 2019 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.
+ *
+ */
+
+#ifndef GRPCPP_IMPL_CODEGEN_DELEGATING_CHANNEL_H
+#define GRPCPP_IMPL_CODEGEN_DELEGATING_CHANNEL_H
+
+namespace grpc {
+namespace internal {
+
+class DelegatingChannel : public ::grpc::ChannelInterface {
+ public:
+  virtual ~DelegatingChannel() {}
+
+  DelegatingChannel(std::shared_ptr<::grpc::ChannelInterface> delegate_channel)
+      : delegate_channel_(delegate_channel) {}
+
+  grpc_connectivity_state GetState(bool try_to_connect) override {
+    delegate_channel()->GetState(try_to_connect);
+  }
+
+  std::shared_ptr<::grpc::ChannelInterface> delegate_channel() {
+    return delegate_channel_;
+  }
+
+ private:
+  internal::Call CreateCall(const internal::RpcMethod& method,
+                            ClientContext* context,
+                            ::grpc_impl::CompletionQueue* cq) override {
+    return delegate_channel()->CreateCall(method, context, cq);
+  }
+
+  void PerformOpsOnCall(internal::CallOpSetInterface* ops,
+                        internal::Call* call) override {
+    delegate_channel()->PerformOpsOnCall(ops, call);
+  }
+
+  void* RegisterMethod(const char* method) override {
+    return delegate_channel()->RegisterMethod(method);
+  }
+
+  void NotifyOnStateChangeImpl(grpc_connectivity_state last_observed,
+                               gpr_timespec deadline,
+                               ::grpc_impl::CompletionQueue* cq,
+                               void* tag) override {
+    delegate_channel()->NotifyOnStateChangeImpl(last_observed, deadline, cq,
+                                                tag);
+  }
+
+  bool WaitForStateChangeImpl(grpc_connectivity_state last_observed,
+                              gpr_timespec deadline) override {
+    return delegate_channel()->WaitForStateChangeImpl(last_observed, deadline);
+  }
+
+  internal::Call CreateCallInternal(const internal::RpcMethod& method,
+                                    ClientContext* context,
+                                    ::grpc_impl::CompletionQueue* cq,
+                                    size_t interceptor_pos) override {
+    return delegate_channel()->CreateCallInternal(method, context, cq,
+                                                  interceptor_pos);
+  }
+
+  ::grpc_impl::CompletionQueue* CallbackCQ() override {
+    return delegate_channel()->CallbackCQ();
+  }
+
+  std::shared_ptr<::grpc::ChannelInterface> delegate_channel_;
+};
+
+}  // namespace internal
+}  // namespace grpc
+
+#endif  // GRPCPP_IMPL_CODEGEN_DELEGATING_CHANNEL_H

test/cpp/end2end/BUILD

@@ -165,6 +165,24 @@ grpc_cc_test(
     ],
 )
 
+grpc_cc_test(
+    name = "delegating_channel_test",
+    srcs = ["delegating_channel_test.cc"],
+    external_deps = [
+        "gtest",
+    ],
+    deps = [
+        ":test_service_impl",
+        "//:gpr",
+        "//:grpc",
+        "//:grpc++",
+        "//src/proto/grpc/testing:echo_messages_proto",
+        "//src/proto/grpc/testing:echo_proto",
+        "//test/core/util:grpc_test_util",
+        "//test/cpp/util:test_util",
+    ],
+)
+
 grpc_cc_test(
     name = "client_interceptors_end2end_test",
     srcs = ["client_interceptors_end2end_test.cc"],

test/cpp/end2end/delegating_channel_test.cc

@@ -0,0 +1,100 @@
+/*
+ *
+ * Copyright 2018 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.
+ *
+ */
+
+#include <memory>
+#include <vector>
+
+#include <grpcpp/channel.h>
+#include <grpcpp/client_context.h>
+#include <grpcpp/create_channel.h>
+#include <grpcpp/generic/generic_stub.h>
+#include <grpcpp/impl/codegen/delegating_channel.h>
+#include <grpcpp/impl/codegen/proto_utils.h>
+#include <grpcpp/server.h>
+#include <grpcpp/server_builder.h>
+#include <grpcpp/server_context.h>
+#include <grpcpp/support/client_interceptor.h>
+
+#include "src/proto/grpc/testing/echo.grpc.pb.h"
+#include "test/core/util/port.h"
+#include "test/core/util/test_config.h"
+#include "test/cpp/end2end/test_service_impl.h"
+#include "test/cpp/util/byte_buffer_proto_helper.h"
+#include "test/cpp/util/string_ref_helper.h"
+
+#include <gtest/gtest.h>
+
+namespace grpc {
+namespace testing {
+namespace {
+
+class TestChannel : public internal::DelegatingChannel {
+ public:
+  TestChannel(std::shared_ptr<ChannelInterface> delegate_channel)
+      : internal::DelegatingChannel(delegate_channel) {}
+  // Always returns GRPC_CHANNEL_READY
+  grpc_connectivity_state GetState(bool try_to_connect) override {
+    return GRPC_CHANNEL_READY;
+  }
+};
+
+class DelegatingChannelTest : public ::testing::Test {
+ protected:
+  DelegatingChannelTest() {
+    int port = grpc_pick_unused_port_or_die();
+    ServerBuilder builder;
+    server_address_ = "localhost:" + std::to_string(port);
+    builder.AddListeningPort(server_address_, InsecureServerCredentials());
+    builder.RegisterService(&service_);
+    server_ = builder.BuildAndStart();
+  }
+
+  ~DelegatingChannelTest() { server_->Shutdown(); }
+
+  std::string server_address_;
+  TestServiceImpl service_;
+  std::unique_ptr<Server> server_;
+};
+
+TEST_F(DelegatingChannelTest, SimpleTest) {
+  auto channel = CreateChannel(server_address_, InsecureChannelCredentials());
+  std::shared_ptr<TestChannel> test_channel =
+      std::make_shared<TestChannel>(channel);
+  // gRPC channel should be in idle state at this point but our test channel
+  // will return ready.
+  EXPECT_EQ(channel->GetState(false), GRPC_CHANNEL_IDLE);
+  EXPECT_EQ(test_channel->GetState(false), GRPC_CHANNEL_READY);
+  auto stub = grpc::testing::EchoTestService::NewStub(test_channel);
+  ClientContext ctx;
+  EchoRequest req;
+  req.set_message("Hello");
+  EchoResponse resp;
+  Status s = stub->Echo(&ctx, req, &resp);
+  EXPECT_EQ(s.ok(), true);
+  EXPECT_EQ(resp.message(), "Hello");
+}
+
+}  // namespace
+}  // namespace testing
+}  // namespace grpc
+
+int main(int argc, char** argv) {
+  grpc::testing::TestEnvironment env(argc, argv);
+  ::testing::InitGoogleTest(&argc, argv);
+  return RUN_ALL_TESTS();
+}

tools/doxygen/Doxyfile.c++

@@ -966,6 +966,7 @@ include/grpcpp/impl/codegen/config_protobuf.h \
 include/grpcpp/impl/codegen/core_codegen.h \
 include/grpcpp/impl/codegen/core_codegen_interface.h \
 include/grpcpp/impl/codegen/create_auth_context.h \
+include/grpcpp/impl/codegen/delegating_channel.h \
 include/grpcpp/impl/codegen/grpc_library.h \
 include/grpcpp/impl/codegen/intercepted_channel.h \
 include/grpcpp/impl/codegen/interceptor.h \

tools/doxygen/Doxyfile.c++.internal

@@ -968,6 +968,7 @@ include/grpcpp/impl/codegen/core_codegen.h \
 include/grpcpp/impl/codegen/core_codegen.h \
 include/grpcpp/impl/codegen/core_codegen_interface.h \
 include/grpcpp/impl/codegen/create_auth_context.h \
+include/grpcpp/impl/codegen/delegating_channel.h \
 include/grpcpp/impl/codegen/grpc_library.h \
 include/grpcpp/impl/codegen/intercepted_channel.h \
 include/grpcpp/impl/codegen/interceptor.h \

tools/run_tests/generated/sources_and_headers.json

@@ -3617,6 +3617,24 @@
     "third_party": false, 
     "type": "target"
   }, 
+  {
+    "deps": [
+      "gpr", 
+      "grpc", 
+      "grpc++", 
+      "grpc++_test_util", 
+      "grpc_test_util"
+    ], 
+    "headers": [], 
+    "is_filegroup": false, 
+    "language": "c++", 
+    "name": "delegating_channel_test", 
+    "src": [
+      "test/cpp/end2end/delegating_channel_test.cc"
+    ], 
+    "third_party": false, 
+    "type": "target"
+  }, 
   {
     "deps": [
       "gpr", 
@@ -10138,6 +10156,7 @@
       "include/grpcpp/impl/codegen/config.h", 
       "include/grpcpp/impl/codegen/core_codegen_interface.h", 
       "include/grpcpp/impl/codegen/create_auth_context.h", 
+      "include/grpcpp/impl/codegen/delegating_channel.h", 
       "include/grpcpp/impl/codegen/grpc_library.h", 
       "include/grpcpp/impl/codegen/intercepted_channel.h", 
       "include/grpcpp/impl/codegen/interceptor.h", 
@@ -10216,6 +10235,7 @@
       "include/grpcpp/impl/codegen/config.h", 
       "include/grpcpp/impl/codegen/core_codegen_interface.h", 
       "include/grpcpp/impl/codegen/create_auth_context.h", 
+      "include/grpcpp/impl/codegen/delegating_channel.h", 
       "include/grpcpp/impl/codegen/grpc_library.h", 
       "include/grpcpp/impl/codegen/intercepted_channel.h", 
       "include/grpcpp/impl/codegen/interceptor.h", 

tools/run_tests/generated/tests.json

@@ -4423,6 +4423,30 @@
     ], 
     "uses_polling": false
   }, 
+  {
+    "args": [], 
+    "benchmark": false, 
+    "ci_platforms": [
+      "linux", 
+      "mac", 
+      "posix", 
+      "windows"
+    ], 
+    "cpu_cost": 1.0, 
+    "exclude_configs": [], 
+    "exclude_iomgrs": [], 
+    "flaky": false, 
+    "gtest": true, 
+    "language": "c++", 
+    "name": "delegating_channel_test", 
+    "platforms": [
+      "linux", 
+      "mac", 
+      "posix", 
+      "windows"
+    ], 
+    "uses_polling": true
+  }, 
   {
     "args": [], 
     "benchmark": false,