122 lines
3.4 KiB
JavaScript
122 lines
3.4 KiB
JavaScript
import { Socket } from 'net'
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import btc from 'better-try-catch'
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import bunyan from 'bunyan'
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// import Stream from 'delimiter-stream'
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import JsonStream from './json'
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export default class Consumer extends Socket {
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constructor (path={}, opts={}) {
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super()
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// set or tcp socket
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if (typeof(path)!=='string') {
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opts = path
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if (!path.host || !path.port) opts = path
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this.host = path.host || '127.0.0.1' // TODO log a warning about host on same machine
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this.port = path.port || 8080
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} else this.path = path
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this.packet = {
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_process: async (packet) => {
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console.log('default processor -- packet from socket')
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console.dir(packet)
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return packet }
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}
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this.keepAlive = opts.keepAlive ? opts.keepAlive : true
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this._ready = false
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this.timeout = opts.timeout || 500
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this.wait = opts.wait || 5
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this.stream = new JsonStream()
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this.packet = {
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_process: (packet) => {
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packet.res='echoed'
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return packet }
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}
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// logging
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this.log_file=opts.log_file || './socket.log'
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this.log_opts = {streams:[]}
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this.log_opts.name = opts.name ? opts.name : 'uci-socket-consumer'
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// this.log_opts.streams.push({level: 'info',path: this.log_file })
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if (opts.log) this.log_opts.streams.push({level: 'info',stream: process.stdout})
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this.log = bunyan.createLogger(this.log_opts)
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// bind to class for other class functions
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this.connect = this.connect.bind(this)
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this.ready = this.ready.bind(this)
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}
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ready() {return this._ready}
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async connect (context) {
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if (context) this.packet.context = context
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else this.packet.context = this
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this.listen()
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this.log.info('listening')
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return new Promise( (resolve,reject) => {
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this.on('error', async (err) => {
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if (err.code === 'EISCONN') {
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return resolve('ready')
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}
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return reject(err)
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})
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super.connect({ port:this.port, host:this.host, path: this.path }, async () => {
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this.log.info({path:this.path},'connecting')
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this.setKeepAlive(this.keepAlive)
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let [err, res] = await btc(isReady).bind(this)(this.ready, this.wait, this.timeout)
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if (err) reject(err)
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this.log.info('handshake done, connected')
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resolve(res)
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})
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}) //end promise
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}
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async send(packet) {
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await this.write(this.stream.serialize(packet))
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// handle error here?
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}
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async listen () {
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this.on('data', this.stream.onData)
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this.stream.on('message', messageProcess.bind(this))
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async function messageProcess (packet) {
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// console.log('incoming packet from server', packet)
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if (packet.ready) {
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this._ready = true
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return }
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// console.log('consumer processor',this.packet._process)
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await this.packet._process(packet)
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}
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}
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registerPacketContext(obj) {
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this.packet.context = obj
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}
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registerPacketProcessor (func) {
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this.packet._process = func
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}
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} // end class
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// wait for handshake packet from socket
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function isReady(ready, wait=30, timeout=1000) {
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let log = this.log
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let time = 0
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return new Promise((resolve, reject) => {
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(function waitReady(){
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if (time > timeout) return reject(`timeout trying to connect after ${timeout}ms`)
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if (ready()) return resolve('ready')
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log.info(`waiting ${wait}ms for handshake`)
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time += wait
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setTimeout(waitReady, wait)
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})()
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})
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}
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