now process topic to cmd prop and vice versa so it is compatible with uci packets
parent
8ac552e9a8
commit
f08e361d2e
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@ -1,17 +1,19 @@
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import Client from '../src/client'
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import btc from 'better-try-catch'
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// let mqtt = new Client({id:'example-mqtt-client', url:'tcp://trantor:1883', topics:'test1'})
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let mqtt = new Client({id:'example-mqtt-client', connect:{host:'localhost', port:1883}, topics:'topic1'})
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let mqtt = new Client({id:'example-mqtt-client', topics:'lights'})
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;
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(async () => {
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await mqtt.connect()
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console.log(await mqtt.connect())
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await mqtt.send({cmd:'test', status:'sent to topic1 implicitly'})
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await mqtt.subscribe('topic2')
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await mqtt.send('topic2', {cmd:'test', status:'sent to topic2 explicitly'})
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await mqtt.unsubscribe('topic2')
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await mqtt.send('topic2', {cmd:'test', status:'sent to topic2 with subscription'})
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// await mqtt.subscribe('lights')
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})().catch(err => {
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@ -1,6 +1,6 @@
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{
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"name": "@uci/mqtt",
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"version": "0.0.5",
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"version": "0.1.0",
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"description": "mqtt client with json payloads and mqtt custom broker",
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"main": "src",
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"scripts": {
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@ -29,7 +29,7 @@
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"@uci/logger": "^0.0.3",
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"async-mqtt": "^1.0.1",
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"better-try-catch": "^0.6.2",
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"lodash.isarray": "^4.0.0",
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"is-plain-object": "^2.0.4",
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"lodash.merge": "^4.6.1",
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"lodash.union": "^4.6.0",
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"lodash.xor": "^4.5.0"
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@ -4,50 +4,53 @@ import btc from 'better-try-catch'
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import union from 'lodash.union'
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import xor from 'lodash.xor'
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import logger from '@uci/logger'
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import isPlainObject from 'is-plain-object'
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let log = {}
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export default class Client {
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constructor (opts={}) {
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this.id = opts.id || opts.name || 'mqtt:'+ new Date().getTime()
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this.url = opts.url
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this.url = opts.url || ''
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// subscription topics can be string of commna delimited or array of strings see object see mqtt.js docs
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this.topics = Array.isArray(opts.topics) ? opts.topics : (opts.topics ? opts.topics.split(',') : [this.id])
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this.opts = opts.connect || {} // see options for new mqtt.Client
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// self bindings
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this.connect = this.connect.bind(this)
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this.push = this.send
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}
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async connect () {
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return new Promise( (resolve,reject) => {
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// connect returns connected mqtt client instance so merge it to class
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// console.log(this)
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let mqtt = connect(this.url,this.opts)
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this._extend(mqtt,'subscribe,unsubscribe')
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this._log()
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this._listen()
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this.on('reconnect', () => {
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log.info('mqtt client reconnected to broker' )
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this.subscribe(this.topics)
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})
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this._extend(mqtt,'subscribe,unsubscribe') // merge mqtt client into class extend with given functions
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let timeout = this.opts.connectTimeout || 5000
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setTimeout(()=>{
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reject(`ending mqtt connection attempt, no broker at ${this._client.options.hostname}:${this._client.options.port}`)
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},timeout)
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this.once('connect', () => {
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this.subscribe(this.topics)
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log.info('mqtt client connected to broker' )
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resolve(`mqtt client connected to broker at ${this._client.options.host}`)
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})
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this._log()
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this._listen()
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this.on('error', err => {
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log.fatal({err:err},'connection error to broker' )
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console.log('connection error',err.code)
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reject(err)
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this.on('reconnect', () => {
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log.info('mqtt client reconnected to broker' )
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this.subscribe(this.topics)
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})
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this.on('error', err => {
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log.fatal({err:err},'connection error to broker' )
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console.log('connection error',err.code)
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})
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this.subscribe(this.topics)
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log.info({options:this._client.options},`mqtt client connected to broker at ${this._client.options.hostname}:${this._client.options.port}`)
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resolve(`mqtt client connected to broker at ${this._client.options.hostname}:${this._client.options.port}`)
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})
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}) //end promise
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}
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async subscribe(topic,options={}) {
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@ -55,6 +58,7 @@ export default class Client {
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if (typeof topic==='string') topic = topic.split(',')
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this.topics=union(this.topics,topic)
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}
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log.info(`subscription for topic ${topic} added`)
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this._subscribe(topic,options)
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}
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@ -66,23 +70,24 @@ export default class Client {
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this._unsubscribe(topic)
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}
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async send(topics,payload,options) {
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async send(packet,topics,options) {
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if (typeof topics !=='string' && !Array.isArray(topics)) {
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payload = topics
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options = topics
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topics = this.topics
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} else { if (typeof topics ==='string') topics=topics.split(',') }
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let payload = {}
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if (typeof packet !== 'string') {
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payload = this._serialize(packet)
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if (!payload) payload = this._serialize({ err: 'could not serialze packet'})
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topics = [packet.cmd] || topics // if payload has a cmd use that as topic
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}
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if (typeof topics ==='string') topics = topics.split(',')
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// console.log('topics using', topics)
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let serial = this._serialize(payload)
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if (serial) {
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let pubs = []
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topics.forEach( async topic => {
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pubs.push(this.publish(topic,serial,options))
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})
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return await Promise.all(pubs)
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}
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else payload = this._serialize({ data:packet })
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let pubs = []
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topics.forEach( async topic => {
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log.info(`sending ${payload} to topic ${topic} with options ${options}`)
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pubs.push(this.publish(topic,payload,options))
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})
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return await Promise.all(pubs)
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}
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registerPacketProcessor (func) {
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@ -91,34 +96,33 @@ export default class Client {
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_serialize(json) {
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let [err,payload] = btc(JSON.stringify)(json)
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if (err) { // await mqtt.unsubscribe('test2')
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// await mqtt.send({cmd:'test', status:'I\'m good'})
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// console.log('+++++++++++++++')
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log.warn(`error unable to stringify json:${json} - send aborted`)
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if (err) {
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log.warn(`error unable to stringify json:${json}`)
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return null
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}
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return payload
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}
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_listen () {
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log.info('listening for incoming packets from broker')
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log.info(`listening for incoming packets from broker on topics ${this.topics}`)
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this.on('message',messageProcess.bind(this))
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async function messageProcess (topic,payload) {
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log.info('incoming messeage on topic', topic)
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log.info('incoming message on topic', topic)
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let packet = this._handlePayload(payload)
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if (packet) await this._packetProcess (packet,topic)
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if(packet) packet.cmd = packet.cmd || topic // payload had no command that use topic as cmd
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else packet = {cmd:topic}
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let res = await this._packetProcess(packet,topic) || {}
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this.send(res)
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}
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}
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_handlePayload (payload) {
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let [err,packet] = btc(JSON.parse)(payload.toString())
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if (err) {
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log.fatal({payload:payload},'Could not parse JSON of payload')
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// console.log('Could not parse JSON of payload', payload.toString())
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return null
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log.info('payload not json returning as prop data:<payload>')
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}
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if (!isPlainObject(packet)) packet = { data:payload.toString() }
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return packet
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}
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@ -129,8 +133,6 @@ export default class Client {
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console.dir(packet)
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console.log(packet.status)
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console.log('========================')
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// await mqtt.send({cmd:'test', status:'I\'m good'})
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// console.log('+++++++++++++++')=')
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}
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async _log() {
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