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The C based gRPC (C++, Python, Ruby, Objective-C, PHP, C#)
https://grpc.io/
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112 lines
3.6 KiB
112 lines
3.6 KiB
/* |
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* |
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* Copyright 2021 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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* |
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*/ |
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// Explicitly define HAVE_ABSEIL to avoid conflict with OTel's Abseil |
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// version. Refer |
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// https://github.com/open-telemetry/opentelemetry-cpp/issues/1042. |
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#ifndef HAVE_ABSEIL |
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#define HAVE_ABSEIL |
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#endif |
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#include <iostream> |
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#include <memory> |
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#include <string> |
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#include "absl/flags/flag.h" |
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#include "absl/flags/parse.h" |
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#include "absl/strings/str_format.h" |
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#include "opentelemetry/exporters/prometheus/exporter_factory.h" |
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#include "opentelemetry/exporters/prometheus/exporter_options.h" |
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#include "opentelemetry/sdk/metrics/meter_provider.h" |
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#include <grpcpp/ext/otel_plugin.h> |
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#include <grpcpp/ext/proto_server_reflection_plugin.h> |
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#include <grpcpp/grpcpp.h> |
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#include <grpcpp/health_check_service_interface.h> |
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#ifdef BAZEL_BUILD |
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#include "examples/cpp/otel/codelab/util.h" |
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#include "examples/protos/helloworld.grpc.pb.h" |
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#else |
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#include "helloworld.grpc.pb.h" |
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#include "util.h" |
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#endif |
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ABSL_FLAG(uint16_t, port, 50051, "Server port for the service"); |
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ABSL_FLAG(std::string, prometheus_endpoint, "localhost:9464", |
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"Prometheus exporter endpoint"); |
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namespace { |
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using grpc::CallbackServerContext; |
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using grpc::Server; |
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using grpc::ServerBuilder; |
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using grpc::ServerUnaryReactor; |
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using grpc::Status; |
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using helloworld::Greeter; |
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using helloworld::HelloReply; |
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using helloworld::HelloRequest; |
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// Logic and data behind the server's behavior. |
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class GreeterServiceImpl final : public Greeter::CallbackService { |
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ServerUnaryReactor* SayHello(CallbackServerContext* context, |
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const HelloRequest* request, |
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HelloReply* reply) override { |
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std::string prefix("Hello "); |
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reply->set_message(prefix + request->name()); |
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// CODELAB HINT: This sleep seems suspicious. |
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std::this_thread::sleep_for(std::chrono::seconds(5)); |
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ServerUnaryReactor* reactor = context->DefaultReactor(); |
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reactor->Finish(Status::OK); |
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return reactor; |
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} |
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}; |
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void RunServer(uint16_t port) { |
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std::string server_address = absl::StrFormat("0.0.0.0:%d", port); |
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GreeterServiceImpl service; |
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grpc::EnableDefaultHealthCheckService(true); |
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grpc::reflection::InitProtoReflectionServerBuilderPlugin(); |
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ServerBuilder builder; |
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// Listen on the given address without any authentication mechanism. |
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builder.AddListeningPort(server_address, grpc::InsecureServerCredentials()); |
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// Register "service" as the instance through which we'll communicate with |
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// clients. In this case it corresponds to an *synchronous* service. |
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builder.RegisterService(&service); |
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// Finally assemble the server. |
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std::unique_ptr<Server> server(builder.BuildAndStart()); |
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std::cout << "Server listening on " << server_address << std::endl; |
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// Wait for the server to shutdown. Note that some other thread must be |
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// responsible for shutting down the server for this call to ever return. |
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server->Wait(); |
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} |
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} // namespace |
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int main(int argc, char** argv) { |
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absl::ParseCommandLine(argc, argv); |
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// CODELAB HINT : Add code to register gRPC OpenTelemetry plugin here. |
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RunServer(absl::GetFlag(FLAGS_port)); |
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return 0; |
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}
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