143 lines
5.1 KiB
JavaScript
143 lines
5.1 KiB
JavaScript
const ws = require('ws')
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const {randomBytes} = require('crypto')
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const sleep = (ms)=>new Promise((resolve, reject)=>setTimeout(resolve, ms))
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// 建议把 onopen, onerror, onclose, onmessage 保留给系统使用，例如reconnecting。用户使用 on(event, listener)
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const DAD = module.exports = class TicSocket extends ws {
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constructor(address, protocols, options){
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let ws = super(address, protocols, options)
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DAD.upgrade(ws)
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}
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static upgrade(ws){
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ws.__proto__ = DAD.prototype
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ws.sid = randomBytes(16).toString('hex')
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ws.onMessage()
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return ws
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}
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static connectAsync(url) {
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return new Promise(function(resolve, reject) {
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let socket = new DAD(url)
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socket.onopen = ()=>resolve(socket)
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socket.onerror = (err)=>reject(err)
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})
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}
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reconnectAsync(url){
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if ( this.readyState < 2 ) {
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return Promise.resolve(this)
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}
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return new Promise((resolve, reject)=>{
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let socket = new DAD(url || this.url)
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socket.once('open', ()=>resolve(socket))
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socket.once('error', (err)=>reject(err))
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})
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}
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notify({rpc, param, options, cb}={}){ // 发起同步的远程调用
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this.send(JSON.stringify({type:'NOTIFY', rpc, param, options, cb}))
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}
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requestAsync( { rpc, param, ack, timeout = 5000 } = {} ) { // 发起异步的远程调用(rpc)
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let randomEvent = randomBytes(16).toString('hex')
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// console.log('randomEvent is randomized: ', randomEvent)
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if ( typeof(ack) === 'function' ){ // 有回调
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this.send(JSON.stringify({type:'REQUEST', rpc, param, randomEvent}), ()=>{
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// console.log('in callback, randomEvent=', randomEvent)
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this.once(randomEvent, ack)
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setTimeout(()=>{
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if (this.eventNames().indexOf(randomEvent)>=0){
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this.removeAllListeners(randomEvent)
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ack({_state:'timeout', error:'timeout happens'})
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}
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}, timeout)
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})
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} else { // 没有回调
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return new Promise((resolve, reject)=>{
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this.send(JSON.stringify({type:'REQUEST', rpc, param, randomEvent}), ()=>{
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this.once(randomEvent, resolve)
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setTimeout(()=>{
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if (this.eventNames().indexOf(randomEvent)>=0){
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this.removeAllListeners(randomEvent)
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resolve({_state:'timeout', error:'timeout happens'})
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}
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}, timeout)
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})
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})
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}
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}
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onMessage(){ // 接收到远程消息
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this.onmessage = async ({data})=>{ // 不能直接定义成一个函数，而要现场赋值。因为里面用到了 this 还是指向 ws.prototype 而不是socket本身
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// console.log('onmessage 被调用')
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try {
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let obj = JSON.parse(data)
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// console.log('message data parsed to obj=',obj)
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switch (obj.type) {
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case 'NOTIFY': // 接收到同步的远程调用
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// console.log(`NOTIFY message: rpc=${obj.rpc}, param=${JSON.stringify(obj.param)}`)
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if (this.hasOwnProperty(obj.rpc)) // 作为rpc调用
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this[obj.rpc](obj.param)
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else if (this.eventNames().indexOf(obj.rpc)>=0) // 作为event调用
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this.emit(obj.rpc, obj.param)
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else
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console.log('onmessage unknown notification')
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case 'REQUEST': // 接收到异步的远程调用
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// console.log(`被动方 收到 REQUEST: rpc=${obj.rpc}, param=${JSON.stringify(obj.param)}`)
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let result
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if (this.hasOwnProperty(obj.rpc)) {
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result = await this[obj.rpc](obj.param)
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}else {
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result = {_state:'error', error:'unknown rpc'}
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}
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if (obj.randomEvent){
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this.send(JSON.stringify({type:'REPLY', randomEvent: obj.randomEvent, result})) // 返回结果给远程
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}
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case 'REPLY': // 接收到远程返回的结果
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// console.log('主动方 收到 REPLY: result=', obj.result)
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this.emit(obj.randomEvent, obj.result)
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default:
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}
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}catch(exception){
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console.error('Invalid socket message received!')
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return
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}
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}
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}
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}
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// (async ()=>{
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// new TicSocket('http://localhost:9007')
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// await sleep(20000)
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// new TicSocket.Server({port:9007})
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// await sleep(20000)
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// })()
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/*
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//TicSocket=require('./Ling/TicSocket.js');
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server = new TicSocket.Server({port:6000});
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var serverSocket; server.on('connection', (socket)=>{console.log('socket coming');
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serverSocket = TicSocket.upgrade(socket).on('close', (code, reason)=>console.log('socket is closed for code and reason: ', code, reason))
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.on('error', (errer)=>console.log('socket has error: ', error))
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})
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TicSocket.connectAsync('http://localhost:6000').then((clientSocket)=>{
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clientSocket.request('testfunc', {height:99}, (result)=>console.log('using request: ', result), 3000)
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return clientSocket
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}).then((clientSocket)=>{
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console.log('sleeping...')
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sleep(2000)
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return clientSocket
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}).then(async (clientSocket)=>{
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let result = await clientSocket.requestAsync('testfunc', {height:99}, 3000).catch(console.log)
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console.log('using requestAsync:', result)
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process.exit()
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}).catch((e)=>{
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console.log('connect error happens:', e)
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})
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*/ |