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The C based gRPC (C++, Python, Ruby, Objective-C, PHP, C#)
https://grpc.io/
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87 lines
2.8 KiB
87 lines
2.8 KiB
5 months ago
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/*
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* Copyright 2024 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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#include <iostream>
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#include <memory>
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#include <string>
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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/protos/helloworld.grpc.pb.h"
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#else
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#include "helloworld.grpc.pb.h"
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#endif
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using grpc::Server;
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using grpc::ServerBuilder;
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using grpc::ServerContext;
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using grpc::Status;
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using grpc::StatusCode;
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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::Service {
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public:
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Status SayHello(ServerContext* context, const HelloRequest* request,
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HelloReply* reply) override {
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if (++request_counter_ % request_modulo_ != 0) {
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// Return an OK status for every request_modulo_ number of requests,
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// return UNAVAILABLE otherwise.
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std::cout << "return UNAVAILABLE" << std::endl;
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return Status(StatusCode::UNAVAILABLE, "");
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}
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std::string prefix("Hello ");
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reply->set_message(prefix + request->name());
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std::cout << "return OK" << std::endl;
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return Status::OK;
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}
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private:
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static constexpr int request_modulo_ = 4;
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int request_counter_ = 0;
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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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int main(int argc, char** argv) {
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RunServer(/*port=*/50052);
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return 0;
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}
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