0.1.6

major refactor of websocket client
remove auto reconnect dependency and wrote zero dep one.
Has promise for initial connect and then will reconnect emmiting disconnet/reconnect to server events

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@uci/websocket-client",
-  "version": "0.1.5",
+  "version": "0.1.6",
   "description": "JSON packet browser client over web socket",
   "main": "src",
   "scripts": {
@@ -29,7 +29,8 @@
   "devDependencies": {},
   "dependencies": {
     "auto-bind": "^2.0.0",
-    "eventemitter3": "^3.1.0",
+    "await-to-js": "^2.1.1",
-    "reconnecting-websocket": "^4.1.10"
+    "better-try-catch": "^0.6.2",
+    "eventemitter3": "^3.1.0"
   }
 }

src/WSConsumer.js

@@ -1,10 +1,9 @@
 // Websocket is a native global for vanilla JS
-// /* globals WebSocket:true */
+/* globals WebSocket:true */
 
 import btc from 'better-try-catch'
 import EventEmitter from 'eventemitter3'
 import autoBind from 'auto-bind'
-import WS from 'reconnecting-websocket'
 
 /**
  * Web Socket Consumer - An in browser consumer/client that can communicate via UCI packets
@@ -12,6 +11,9 @@ import WS from 'reconnecting-websocket'
  * uses the browser built in vanilla js global {@link https://developer.mozilla.org/en-US/docs/Web/API/WebSocket/WebSocket Websocket client class}
  * @extends EventEmitter
  */
+
+let count = 1
+
 class WSConsumer extends EventEmitter {
   /**
    * constructor - Description
@@ -24,9 +26,11 @@ class WSConsumer extends EventEmitter {
     this.name = opts.name || 'browser'
     this.instanceID = new Date().getTime()
     this.url = url
-    this.wsopts = opts.ws || { maxReconnectionDelay: 10000,minReconnectionDelay: 1000 + Math.random() * 4000,reconnectionDelayGrowFactor: 1.3,minUptime: 5000,connectionTimeout: 4000,maxRetries: Infinity,debug: false,}
+    this.rsLimit = opts.rsLimit || 5
+    this.initTimeout = opts.initTimeout || 30000
+    this.rsDelay = opts.rsDelay || 5000   // in large production you'd want a more robust delay calculation
     this.protocol = opts.protocol // available if needed but not documented
-    this.socket = {}
+    this.started = false
     autoBind(this)
   }
 
@@ -38,44 +42,58 @@ class WSConsumer extends EventEmitter {
    * but opted to use https://www.npmjs.com/package/reconnecting-websocket
    */
 
-  // async connect () {
-  //   return new Promise((resolve, reject) => {
-  //     const init = (socket) => {
-  //       if (socket) console.error('Disconnected from Server')
-  //       this.socket = new WebSocket(this.url, this.protocol)
-  //       this.socket.addEventListener('close', init)
-  //       this.socket.addEventListener('open', open.bind(this))
-  //     }
-  //
-  //     setTimeout(function () {
-  //       reject(new Error('Socket did not initially connect in 20 seconds'))
-  //     }, 20000)
-  //
-  //     init()
-  //
-  //     function open () {
-  //       this.listen()
-  //       resolve(`socket open to server at : ${this.url}`)
-  //     }
-  //   })
-  // }
-
   async connect () {
+    // console.log('--- initial connect to websocket at', this.url)
     return new Promise((resolve, reject) => {
-      this.socket = new WS(this.url, this.protocol, this.wsopts)
+      if(!this.url) reject('no url provided!')
+      let timeout
+      let connect = con.bind(this)
+
+      function con () {
+        // console.log(this.started, this.socket)
+        if (this.socket) delete this.socket  // make sure previous socket is garabage collected
+        this.socket = new WebSocket(this.url, this.protocol)
+        // console.log('ready after create', this.socket.readyState, this.socket.onopen, this.socket.onclose)
         this.socket.onopen = open.bind(this)
 
-      setTimeout(function () {
+        timeout = setTimeout(function () {
-        reject(new Error('Socket did not initially connect in 20 seconds'))
+          if (!this.started && count===1) console.log('original connection connect failed - retrying')
-      }, 20000)
+          console.log(`socket has not ${this.started?'re':''}connected in ${this.rsDelay*count/1000} seconds`)
-      // this.socket.onerror = (ev) => { reject(`could not connect/reconnect to server : ${ev}`)}
+          count += 1
-
+          if (!this.started && this.rsDelay*count > this.initTimeout) {
-      function open () {
+            let err = `unable to make a connection to websocket server at ${this.url}  within ${this.initTimeout/1000}s`
-        this.listen()
+            console.log(err)
-        resolve(`socket open to server at : ${this.url}`)
+            reject({url:this.url, msg:err})
+          }
+          else connect()
+        }.bind(this), this.rsDelay)
       }
 
-    })
+      function open () {
+        this.listen() // this handles messages
+        console.log(`socket open to server at : ${this.url}`)
+        if (!this.started) this.emit('connected')
+        else this.emit('reconnected')
+        clearTimeout(timeout)
+        // this.socket.onerror = error.bind(this)
+        this.socket.onclose = close.bind(this)
+        console.log(this.socket)
+        count = 0
+        this.started = true
+        resolve({url:this.url, msg:`socket open to server at : ${this.url}`})
+      }
+
+      connect()  // get the ball rolling
+
+      function close () {
+        this.socket.onclose = null
+        console.error('Socket has closed, attempting reconnect')
+        this.removeAllListeners('push')
+        this.socket.onmessage = null
+        this.emit('disconnected')
+        connect()
+      }
+    }) // end promise
   }
 
   /**
@@ -86,7 +104,9 @@ class WSConsumer extends EventEmitter {
    * @returns {type} Description
    */
   listen (func) {
-    this.socket.addEventListener('message', handler.bind(this))
+    this.socket.onmessage = packetHandler.bind(this)
+
+    // process 'pushed'  packets
     this.on('pushed', async function (packet) {
       // TODO do some extra security here for 'evil' pushed packets
       let res = await this._packetProcess(packet)
@@ -98,7 +118,7 @@ class WSConsumer extends EventEmitter {
       }
     })
 
-    function handler (event) {
+    function packetHandler (event) {
       let packet = {}
       if (this.socket.readyState === 1) {
         let [err, parsed] = btc(JSON.parse)(event.data)
@@ -110,7 +130,9 @@ class WSConsumer extends EventEmitter {
         }
       }
       // console.log('in the handler', event.data)
-      if (func) func(packet)
+      if (func) func(packet)  // extra processing if enabled
+      // this is response to a packet send command listener and is processed below
+      // will also emit 'pushed' via id which can be listened for in app
       this.emit(packet._header.id, packet)
     }
   }
@@ -165,6 +187,7 @@ class WSConsumer extends EventEmitter {
     this._packetProcess = func
   }
 
+  // do nothing
   async _packetProcess (packet) {
     return Promise.resolve(packet)
   }