nodejs grpc

npm包

• grpc
• @grpc/proto-loader

server.js

const path = require('path');
const grpc = require('grpc');
const protoLoader = require('@grpc/proto-loader');

const PROTO_PATH = path.resolve(__dirname, 'protos/HelloWorld.proto');
const packageDefinition = protoLoader.loadSync(
  PROTO_PATH,
  {
      keepCase: true,
      longs: String,
      enums: String,
      defaults: true,
      oneofs: true
  }
);
const hello_proto = grpc.loadPackageDefinition(packageDefinition).helloworld;

function sayHello2(call, callback) {
  try {
    let data = 'hello ' + call.request.name + ' and city is ' + call.request.city;
    callback && callback(null, {message: data})
  } catch (err) {
    console.log('错误');
    callback && callback(err)
  }
}

function printAge2(call, callback) {
  try{
    let text = 'current age is ' + call.request.age;
    callback && callback(null, {text})
  } catch (err) {
    console.log('错误');
    callback && callback(err)
  }
}

function main() {
  const server = new grpc.Server();
  server.addService(hello_proto.Greeter.service, {
    SayHello: sayHello2,
    printAge: printAge2
  });
  server.bind('127.0.0.1:50051', grpc.ServerCredentials.createInsecure());
  server.start();
  console.log('server start......')
}

main()

client.js

const path = require('path');
const grpc = require('grpc');
const protoLoader = require('@grpc/proto-loader');

const PROTO_PATH = path.resolve(__dirname, 'protos/HelloWorld.proto');
const packageDefinition = protoLoader.loadSync(
  PROTO_PATH,
  {
      keepCase: true,
      longs: String,
      enums: String,
      defaults: true,
      oneofs: true
  }
);

const hello_proto = grpc.loadPackageDefinition(packageDefinition).helloworld;

function main() {
  console.log('client start.......')
  // 调用 Greeter 的存根构造函数，指定服务器地址和端口。
  const client = new hello_proto.Greeter( '127.0.0.1:50051', grpc.credentials.createInsecure());

  // 构造调用服务的方法：使用事件或者回调函数去获得结果
  function getMessage(error, response) {
    if (error) {
      console.log(error);
      return;
    }
    console.log('Greeting: ', response.message)
  }

  function getText(error, response) {
    if (error) {
      console.log(error);
      return;
    }
    console.log('Text is : ', response.text)
  }
  // 调用存根上的方法，传入请求和回调函数
  client.sayHello({name: '孙晓辉', city: '郑州'}, getMessage);
  client.printAge({age: '24'}, getText)
}

main()