Make Term Conn an EventEmitter, add status screen

js/term.js

@@ -1,7 +1,7 @@
 /** Init the terminal sub-module - called from HTML */
 window.termInit = function ({ labels, theme, allFn }) {
   const screen = new TermScreen()
-  const conn = Conn(screen)
+  const conn = new Conn(screen)
   const input = Input(conn)
   const termUpload = TermUpl(conn, input, screen)
   screen.input = input

js/term_conn.js

@@ -1,31 +1,38 @@
 /** Handle connections */
-window.Conn = function (screen) {
-  let ws
-  let heartbeatTout
-  let pingIv
-  let xoff = false
-  let autoXoffTout
-  let reconTout
+window.Conn = class TermConnection extends EventEmitter {
+  constructor (screen) {
+    super()
 
-  let pageShown = false
+    this.screen = screen
+    this.ws = null
+    this.heartbeatTimeout = null
+    this.pingInterval = null
+    this.xoff = false
+    this.autoXoffTimeout = null
+    this.reconTimeout = null
 
-  function onOpen (evt) {
+    this.pageShown = false
+  }
+
+  onWSOpen (evt) {
     console.log('CONNECTED')
-    heartbeat()
-    doSend('i')
+    this.heartbeat()
+    this.send('i')
+
+    this.emit('open')
   }
 
-  function onClose (evt) {
+  onWSClose (evt) {
     console.warn('SOCKET CLOSED, code ' + evt.code + '. Reconnecting...')
-    clearTimeout(reconTout)
-    reconTout = setTimeout(function () {
-      init()
-    }, 2000)
+    clearTimeout(this.reconTimeout)
+    this.reconTimeout = setTimeout(() => this.init(), 2000)
     // this happens when the buffer gets fucked up via invalid unicode.
     // we basically use polling instead of socket then
+
+    this.emit('close', evt.code)
   }
 
-  function onMessage (evt) {
+  onWSMessage (evt) {
     try {
       // . = heartbeat
       switch (evt.data.charAt(0)) {
@@ -35,66 +42,66 @@ window.Conn = function (screen) {
 
         case '-':
           // console.log('xoff');
-          xoff = true
-          autoXoffTout = setTimeout(function () {
-            xoff = false
+          this.xoff = true
+          this.autoXoffTimeout = setTimeout(() => {
+            this.xoff = false
           }, 250)
           break
 
         case '+':
           // console.log('xon');
-          xoff = false
-          clearTimeout(autoXoffTout)
+          this.xoff = false
+          clearTimeout(this.autoXoffTimeout)
           break
 
         default:
-          screen.load(evt.data)
-          if (!pageShown) {
+          this.screen.load(evt.data)
+          if (!this.pageShown) {
             showPage()
-            pageShown = true
+            this.pageShown = true
           }
           break
       }
-      heartbeat()
+      this.heartbeat()
     } catch (e) {
       console.error(e)
     }
   }
 
-  function canSend () {
-    return !xoff
+  canSend () {
+    return !this.xoff
   }
 
-  function doSend (message) {
-    if (_demo) {
-      if (typeof demoInterface !== 'undefined') {
+  send (message) {
+    if (window._demo) {
+      if (typeof window.demoInterface !== 'undefined') {
         demoInterface.input(message)
       } else {
         console.log(`TX: ${JSON.stringify(message)}`)
       }
       return true // Simulate success
     }
-    if (xoff) {
+    if (this.xoff) {
       // TODO queue
       console.log("Can't send, flood control.")
       return false
     }
 
-    if (!ws) return false // for dry testing
-    if (ws.readyState !== 1) {
+    if (!this.ws) return false // for dry testing
+    if (this.ws.readyState !== 1) {
       console.error('Socket not ready')
       return false
     }
     if (typeof message != 'string') {
       message = JSON.stringify(message)
     }
-    ws.send(message)
+    this.ws.send(message)
     return true
   }
 
-  function init () {
+  init () {
     if (window._demo) {
-      if (typeof demoInterface === 'undefined') {
+      if (typeof window.demoInterface === 'undefined') {
         alert('Demoing non-demo demo!') // this will catch mistakes when deploying to the website
       } else {
         demoInterface.init(screen)
@@ -103,42 +110,40 @@ window.Conn = function (screen) {
       return
     }
 
-    clearTimeout(reconTout)
-    clearTimeout(heartbeatTout)
+    clearTimeout(this.reconTimeout)
+    clearTimeout(this.heartbeatTimeout)
 
-    ws = new WebSocket('ws://' + _root + '/term/update.ws')
-    ws.onopen = onOpen
-    ws.onclose = onClose
-    ws.onmessage = onMessage
+    this.ws = new WebSocket('ws://' + _root + '/term/update.ws')
+    this.ws.addEventListener('open', (...args) => this.onWSOpen(...args))
+    this.ws.addEventListener('close', (...args) => this.onWSClose(...args))
+    this.ws.addEventListener('message', (...args) => this.onWSMessage(...args))
     console.log('Opening socket.')
-    heartbeat()
+    this.heartbeat()
+
+    this.emit('connect')
   }
 
-  function heartbeat () {
-    clearTimeout(heartbeatTout)
-    heartbeatTout = setTimeout(heartbeatFail, 2000)
+  heartbeat () {
+    clearTimeout(this.heartbeatTimeout)
+    this.heartbeatTimeout = setTimeout(() => this.onHeartbeatFail(), 2000)
   }
 
-  function heartbeatFail () {
+  onHeartbeatFail () {
     console.error('Heartbeat lost, probing server...')
-    pingIv = setInterval(function () {
+    clearInterval(this.pingInterval)
+    this.pingInterval = setInterval(() => {
       console.log('> ping')
-      $.get('http://' + _root + '/system/ping', function (resp, status) {
+      this.emit('ping')
+      $.get('http://' + _root + '/system/ping', (resp, status) => {
         if (status === 200) {
-          clearInterval(pingIv)
+          clearInterval(this.pingInterval)
           console.info('Server ready, reloading page...')
+          this.emit('ping-success')
           location.reload()
-        }
+        } else this.emit('ping-fail', status)
       }, {
         timeout: 100
       })
     }, 1000)
   }
-
-  return {
-    ws: null,
-    init,
-    send: doSend,
-    canSend // check flood control
-  }
 }

js/term_screen.js

@@ -114,7 +114,8 @@ window.TermScreen = class TermScreen extends EventEmitter {
       fitIntoWidth: 0,
       fitIntoHeight: 0,
       debug: false,
-      graphics: 0
+      graphics: 0,
+      statusScreen: null
     }
 
     // scaling caused by fitIntoWidth/fitIntoHeight
@@ -879,9 +880,17 @@ window.TermScreen = class TermScreen extends EventEmitter {
       height,
       devicePixelRatio,
       gridScaleX,
-      gridScaleY
+      gridScaleY,
+      statusScreen
     } = this.window
 
+    if (statusScreen) {
+      // draw status screen instead
+      this.drawStatus(statusScreen)
+      this.startDrawLoop()
+      return
+    } else this.stopDrawLoop()
+
     const charSize = this.getCharSize()
     const { width: cellWidth, height: cellHeight } = this.getCellSize()
     const screenWidth = width * cellWidth
@@ -1085,6 +1094,72 @@ window.TermScreen = class TermScreen extends EventEmitter {
     if (this.window.debug && this._debug) this._debug.drawEnd()
   }
 
+  drawStatus (statusScreen) {
+    const ctx = this.ctx
+    const {
+      fontFamily,
+      width,
+      height
+    } = this.window
+
+    // reset drawnScreen to force redraw when statusScreen is disabled
+    this.drawnScreen = []
+
+    const cellSize = this.getCellSize()
+    const screenWidth = width * cellSize.width
+    const screenHeight = height * cellSize.height
+
+    ctx.setTransform(devicePixelRatio, 0, 0, devicePixelRatio, 0, 0)
+    ctx.clearRect(0, 0, screenWidth, screenHeight)
+
+    ctx.font = `40px ${fontFamily}`
+    ctx.fillStyle = '#fff'
+    ctx.textAlign = 'center'
+    ctx.textBaseline = 'middle'
+    ctx.fillText(statusScreen.title || '', screenWidth / 2, screenHeight / 2 - 20)
+
+    if (statusScreen.loading) {
+      // show loading spinner
+      ctx.save()
+      ctx.translate(screenWidth / 2, screenHeight / 2 + 50)
+
+      ctx.strokeStyle = '#fff'
+      ctx.lineWidth = 5
+      ctx.lineCap = 'round'
+
+      let t = Date.now() / 1000
+
+      for (let i = 0; i < 12; i++) {
+        ctx.rotate(Math.PI / 6)
+        let offset = ((t * 12) - i) % 12
+        ctx.globalAlpha = Math.max(0.2, 1 - offset / 3)
+        ctx.beginPath()
+        ctx.moveTo(0, 15)
+        ctx.lineTo(0, 30)
+        ctx.stroke()
+      }
+
+      ctx.restore()
+    }
+  }
+
+  startDrawLoop () {
+    if (this._drawTimerThread) return
+    let threadID = Math.random().toString(36)
+    this._drawTimerThread = threadID
+    this.drawTimerLoop(threadID)
+  }
+
+  stopDrawLoop () {
+    this._drawTimerThread = null
+  }
+
+  drawTimerLoop (threadID) {
+    if (!threadID || threadID !== this._drawTimerThread) return
+    requestAnimationFrame(() => this.drawTimerLoop(threadID))
+    this.draw('draw-loop')
+  }
+
   /**
    * Parses the content of an `S` message and schedules a draw
    * @param {string} str - the message content