Merge pull request #16492 from vjpai/client_callback

EXPERIMENTAL: C++  generic client-side unary callback API

2 files changed, 145 insertions, 0 deletions

diff --git a/test/cpp/end2end/BUILD b/test/cpp/end2end/BUILD
index 75dec56a60..0415efc1ef 100644
--- a/test/cpp/end2end/BUILD
+++ b/test/cpp/end2end/BUILD
@@ -98,6 +98,25 @@ grpc_cc_binary(
     ],
 )
 
+grpc_cc_test(
+    name = "client_callback_end2end_test",
+    srcs = ["client_callback_end2end_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:gpr_test_util",
+        "//test/core/util:grpc_test_util",
+        "//test/cpp/util:test_util",
+    ],
+)
+
 grpc_cc_library(
     name = "end2end_test_lib",
     testonly = True,
diff --git a/test/cpp/end2end/client_callback_end2end_test.cc b/test/cpp/end2end/client_callback_end2end_test.cc
new file mode 100644
index 0000000000..75b896b33d
--- /dev/null
+++ b/test/cpp/end2end/client_callback_end2end_test.cc
@@ -0,0 +1,126 @@
+/*
+ *
+ * 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 <functional>
+#include <mutex>
+
+#include <grpcpp/channel.h>
+#include <grpcpp/client_context.h>
+#include <grpcpp/create_channel.h>
+#include <grpcpp/generic/generic_stub.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_callback.h>
+
+#include "src/proto/grpc/testing/echo.grpc.pb.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 <gtest/gtest.h>
+
+namespace grpc {
+namespace testing {
+namespace {
+
+class ClientCallbackEnd2endTest : public ::testing::Test {
+ protected:
+  ClientCallbackEnd2endTest() {}
+
+  void SetUp() override {
+    ServerBuilder builder;
+    builder.RegisterService(&service_);
+
+    server_ = builder.BuildAndStart();
+    is_server_started_ = true;
+  }
+
+  void ResetStub() {
+    ChannelArguments args;
+    channel_ = server_->InProcessChannel(args);
+    stub_.reset(new GenericStub(channel_));
+  }
+
+  void TearDown() override {
+    if (is_server_started_) {
+      server_->Shutdown();
+    }
+  }
+
+  void SendRpcs(int num_rpcs) {
+    const grpc::string kMethodName("/grpc.testing.EchoTestService/Echo");
+    grpc::string test_string("");
+    for (int i = 0; i < num_rpcs; i++) {
+      EchoRequest request;
+      std::unique_ptr<ByteBuffer> send_buf;
+      ByteBuffer recv_buf;
+      ClientContext cli_ctx;
+
+      test_string += "Hello world. ";
+      request.set_message(test_string);
+      send_buf = SerializeToByteBuffer(&request);
+
+      std::mutex mu;
+      std::condition_variable cv;
+      bool done = false;
+      stub_->experimental().UnaryCall(
+          &cli_ctx, kMethodName, send_buf.get(), &recv_buf,
+          [&request, &recv_buf, &done, &mu, &cv](Status s) {
+            GPR_ASSERT(s.ok());
+
+            EchoResponse response;
+            EXPECT_TRUE(ParseFromByteBuffer(&recv_buf, &response));
+            EXPECT_EQ(request.message(), response.message());
+            std::lock_guard<std::mutex> l(mu);
+            done = true;
+            cv.notify_one();
+          });
+      std::unique_lock<std::mutex> l(mu);
+      while (!done) {
+        cv.wait(l);
+      }
+    }
+  }
+  bool is_server_started_;
+  std::shared_ptr<Channel> channel_;
+  std::unique_ptr<grpc::GenericStub> stub_;
+  TestServiceImpl service_;
+  std::unique_ptr<Server> server_;
+};
+
+TEST_F(ClientCallbackEnd2endTest, SimpleRpc) {
+  ResetStub();
+  SendRpcs(1);
+}
+
+TEST_F(ClientCallbackEnd2endTest, SequentialRpcs) {
+  ResetStub();
+  SendRpcs(10);
+}
+
+}  // namespace
+}  // namespace testing
+}  // namespace grpc
+
+int main(int argc, char** argv) {
+  grpc_test_init(argc, argv);
+  ::testing::InitGoogleTest(&argc, argv);
+  return RUN_ALL_TESTS();
+}