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Ubuntu 16.04 通过 CMake 编译 Grpc C++ 项目

2022-02-11 11:04:14 作者：互联网

注：参考代码取自 grpc 源码目录下的 examples\cpp\helloworld

1. 安装 protoc 工具

下载 Grpc_v1.43.0_SetupFile.zip 文件，解压到任意目录
下载链接：https://pan.baidu.com/s/1HYjfQb8CQY56QF2iAGmBNw
提取码：grg0
将解压后的 Grpc_v1.43.0_SetupFile/bin 中的 protoc（文本文件，记录了版本信息）重命名为 protoc.version，然后将 protoc-3.18.1.0（可执行程序）拷贝一下并重命名为 protoc
注：原 protoc-3.18.1.0 文件也是需要用的，不能直接重命名。
将 protoc 拷贝安装到 /usr/local/bin
在 Grpc_v1.43.0_SetupFile 目录打开终端，执行命令如下：
```
chmod +x bin/*
sudo cp -r . /usr/local/
```

2. 通过 protoc 生成 c++ 代码

新建空文件夹 grpc_cpp_demo，在文件夹中创建 helloworld.proto 文件，示例如下：

// Copyright 2015 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.

syntax = "proto3";

option java_multiple_files = true;
option java_package = "io.grpc.examples.helloworld";
option java_outer_classname = "HelloWorldProto";
option objc_class_prefix = "HLW";

package helloworld;

// The greeting service definition.
service Greeter {
  // Sends a greeting
  rpc SayHello (HelloRequest) returns (HelloReply) {}
}

// The request message containing the user's name.
message HelloRequest {
  string name = 1;
}

// The response message containing the greetings
message HelloReply {
  string message = 1;
}

View Code

生成 Protobuf 消息
```
protoc --cpp_out=./ helloworld.proto
```

生成 grpc 客户端和服务器

protoc --grpc_out=./ --plugin=protoc-gen-grpc=grpc_cpp_plugin helloworld.proto

3. 编写客户端/服务器实现自定义业务逻辑

新建文件 greeter_server.cc 来编写服务器端相关代码，示例文件如下：

/*
 *
 * Copyright 2015 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 <iostream>
#include <memory>
#include <string>

#include <grpcpp/grpcpp.h>
#include <grpcpp/health_check_service_interface.h>
#include <grpcpp/ext/proto_server_reflection_plugin.h>

#ifdef BAZEL_BUILD
#include "examples/protos/helloworld.grpc.pb.h"
#else
#include "helloworld.grpc.pb.h"
#endif

using grpc::Server;
using grpc::ServerBuilder;
using grpc::ServerContext;
using grpc::Status;
using helloworld::HelloRequest;
using helloworld::HelloReply;
using helloworld::Greeter;

// Logic and data behind the server's behavior.
class GreeterServiceImpl final : public Greeter::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;

  grpc::EnableDefaultHealthCheckService(true);
  grpc::reflection::InitProtoReflectionServerBuilderPlugin();
  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> 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;
}

View Code

新建文件 greeter_client.cc 来编写客户端相关代码，示例文件如下：

/*
 *
 * Copyright 2015 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 <iostream>
#include <memory>
#include <string>

#include <grpcpp/grpcpp.h>

#ifdef BAZEL_BUILD
#include "examples/protos/helloworld.grpc.pb.h"
#else
#include "helloworld.grpc.pb.h"
#endif

using grpc::Channel;
using grpc::ClientContext;
using grpc::Status;
using helloworld::HelloRequest;
using helloworld::HelloReply;
using helloworld::Greeter;

class GreeterClient {
 public:
  GreeterClient(std::shared_ptr<Channel> channel)
      : stub_(Greeter::NewStub(channel)) {}

  // Assembles the client's payload, sends it and presents the response back
  // from the server.
  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<Greeter::Stub> stub_;
};

int main(int argc, char** argv) {
  // Instantiate the client. It requires a channel, out of which the actual RPCs
  // are created. This channel models a connection to an endpoint specified by
  // the argument "--target=" which is the only expected argument.
  // We indicate that the channel isn't authenticated (use of
  // InsecureChannelCredentials()).
  std::string target_str;
  std::string arg_str("--target");
  if (argc > 1) {
    std::string arg_val = argv[1];
    size_t start_pos = arg_val.find(arg_str);
    if (start_pos != std::string::npos) {
      start_pos += arg_str.size();
      if (arg_val[start_pos] == '=') {
        target_str = arg_val.substr(start_pos + 1);
      } else {
        std::cout << "The only correct argument syntax is --target=" << std::endl;
        return 0;
      }
    } else {
      std::cout << "The only acceptable argument is --target=" << std::endl;
      return 0;
    }
  } else {
    target_str = "localhost:50051";
  }
  GreeterClient greeter(grpc::CreateChannel(
      target_str, grpc::InsecureChannelCredentials()));
  std::string user("world");
  std::string reply = greeter.SayHello(user);
  std::cout << "Greeter received: " << reply << std::endl;

  return 0;
}

View Code

4. 通过 CMake 编译项目

编写 CMakeLists.txt，示例如下：

cmake_minimum_required(VERSION 3.5)

project(grpc_cpp_demo LANGUAGES CXX)

set(CMAKE_CXX_STANDARD 11)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

#添加 Protobuf 和 gRPC 三方库
find_package(Threads REQUIRED)
find_package(Protobuf CONFIG REQUIRED)
find_package(gRPC CONFIG REQUIRED)

set(_GRPC_GRPCPP gRPC::grpc++)
set(_GRPC_REFLECTION gRPC::grpc++_reflection)
set(_PROTOBUF_LIBPROTOBUF protobuf::libprotobuf)

message(STATUS "Using gRPC ${gRPC_VERSION}")
message(STATUS "Using protobuf ${Protobuf_VERSION}")

#生成可执行文件
foreach(_target greeter_client greeter_server)
   add_executable(${_target}
      ${_target}.cc
      helloworld.grpc.pb.cc
      helloworld.grpc.pb.h
      helloworld.pb.cc
      helloworld.pb.h)

   target_link_libraries(${_target}    
      ${_GRPC_GRPCPP}
      ${_GRPC_REFLECTION}
      ${_PROTOBUF_LIBPROTOBUF})
endforeach()

View Code

编译项目

mkdir -p cmake/build
pushd cmake/build
cmake  ../..
make -j
popd

5. 运行项目

在目录 grpc_cpp_demo/cmake/build 打开 2 个终端，分别运行如下命令
```
./greeter_server
```
```
./greeter_client 
```
执行结果如下图所示：

标签：std,CMake,License,16.04,C++,grpc,helloworld,using,include
来源： https://www.cnblogs.com/dhqy/p/15882297.html