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C++ 使用gRPC入门教程

生活百科grpc

gRPC是一个高性能、通用的开源RPC框架，其由主要面向移动应用开发并基于HTTP/2协议标准而设计，基于( )序列化协议开发，且支持众多开发语言，能够基于语言自动生成客户端和服务端功能库 。
1.新建工程、和
添加 - 新建项目 - 控制台应用 、 。
添加 - 新建项目 - 类库 。工程中的三个项目情况如下：
2.自定义服务
在项目里添加.proto用以生成代码 。

C++ 使用gRPC入门教程

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syntax = "proto3";package GrpcLibrary;service GrpcService {rpc SayHello (HelloRequest) returns (HelloReply) {}}message HelloRequest {string name = 1;}message HelloReply {string message = 1;}
执行命令
ThirdParty\grpc_build\bin\protoc.exe -IGrpcLibrary --cpp_out GrpcLibraryGrpcLibrary\HelloWorld.proto --grpc_out GrpcLibrary --plugin=protoc-gen-grpc=ThirdParty\grpc_build\bin\grpc_cpp_plugin.exe
命令执行成功后，目录下会生成、.grpc.pb.h、和.pb.h
将其都添加到项目中 。最后、分别引用类库 。
3.服务端
C++ 使用gRPC入门教程

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// greeter_server.cc#include #include #include #include #ifdef BAZEL_BUILD#include "examples/protos/helloworld.grpc.pb.h"#else#include "HelloWorld.grpc.pb.h"#endifusing grpc::Server;using grpc::ServerBuilder;using grpc::ServerContext;using grpc::Status;using GrpcLibrary::HelloRequest;using GrpcLibrary::HelloReply;using GrpcLibrary::GrpcService;// Logic and data behind the server's behavior.class GreeterServiceImpl final : public GrpcService::Service {Status SayHello(ServerContext* context, const HelloRequest* request,HelloReply* reply) override {std::string prefix("Hello ");reply->set_message(prefix + request->name());return Status::OK;}};void RunServer() {std::string server_address("0.0.0.0:50051");GreeterServiceImpl service;ServerBuilder builder;// Listen on the given address without any authentication mechanism.builder.AddListeningPort(server_address, grpc::InsecureServerCredentials());// Register "service" as the instance through which we'll communicate with// clients. In this case it corresponds to an *synchronous* service.builder.RegisterService(&service);// Finally assemble the server.std::unique_ptr server(builder.BuildAndStart());std::cout << "Server listening on " << server_address << std::endl;// Wait for the server to shutdown. Note that some other thread must be// responsible for shutting down the server for this call to ever return.server->Wait();}int main(int argc, char** argv) {RunServer();return 0;}
4.客户端
// greeter_client.cc#include #include #include #include #ifdef BAZEL_BUILD#include "examples/protos/helloworld.grpc.pb.h"#else#include "helloworld.grpc.pb.h"#endifusing grpc::Channel;using grpc::ClientContext;using grpc::Status;using GrpcLibrary::HelloRequest;using GrpcLibrary::HelloReply;using GrpcLibrary::GrpcService;class GreeterClient {public:GreeterClient(std::shared_ptr channel): stub_(GrpcService::NewStub(channel)) {}std::string SayHello(const std::string& user) {// Data we are sending to the server.HelloRequest request;request.set_name(user);// Container for the data we expect from the server.HelloReply reply;// Context for the client. It could be used to convey extra information to// the server and/or tweak certain RPC behaviors.ClientContext context;// The actual RPC.Status status = stub_->SayHello(&context, request, &reply);// Act upon its status.if (status.ok()) {return reply.message();}else {std::cout << status.error_code() << ": " << status.error_message()<< std::endl;return "RPC failed";}}private:std::unique_ptr stub_;};int main(int argc, char** argv) {GreeterClient greeter(grpc::CreateChannel("localhost:50051", grpc::InsecureChannelCredentials()));std::string user("world");std::string reply = greeter.SayHello(user);std::cout


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