Javascript NodeJS 使用protobufjs Demo和封装成工具类使用

安装依赖

npm install protobufjs

创建proto文件

syntax = "proto3";
package protobuf;

message Chat{
  string msg=1;
}

创建工具类

const protobuf = require("protobufjs");
/**
 * 加载类型
 * @param filePath
 * @param packageName
 * @param typeName
 * @returns {Promise<any>}
 */
const loadType =  async function (filePath,packageName,typeName){
    return new Promise(((resolve, reject) => {
        protobuf.load(filePath, function(err, root) {
            if (err)
            {
                reject(err);
                return
            }

            // Obtain a message type
            var type = root.lookupType(packageName+"."+typeName);
            resolve(type)
        });
    }))
}
const encode = function(type,obj){
    let message = type.create(obj)
    return type.encode(message).finish()
}
const decode = function(type,buffer){
    return type.decode(buffer)
}

module.exports = {
    loadType:loadType,
    encode:encode,
    decode:decode
}
// 使用步骤
/**
 * 安装依赖
 * npm install protobufjs
 */
/**
 * 示范proto文件 protobuf.proto
 *
 *   syntax = "proto3";
 package protobuf;

 message Chat{
      string msg=1;
    }
 */
/**
 * 使用示范 demo.js
 *   const util = require('./ProtobufJSUtil')
     async function main(){
        let type = await util.loadType('./protobuf.proto','protobuf','Chat')
        let msg = {msg:'你好呀，我是一条消息'}
        let serializedBuffer = util.encode(type,msg)
        console.log('压缩后的',serializedBuffer)
        let deserializeText = util.decode(type,serializedBuffer)
        console.log('解压缩后的',deserializeText)
    }
     main()
 */

创建测试类测试

const util = require('./ProtobufJSUtil')
async function main(){
    let type = await util.loadType('./protobuf.proto','protobuf','Chat')
    let msg = {msg:'你好呀，我是一条消息'}
    let serializedBuffer = util.encode(type,msg)
    console.log('压缩后的',serializedBuffer)
    let deserializeText = util.decode(type,serializedBuffer)
    console.log('解压缩后的',deserializeText)
}
main()

执行结果