From 03e5e48d82b98f2a15dfa4515a87e405603926ae Mon Sep 17 00:00:00 2001
From: Christian Pointner <equinox@helsinki.at>
Date: Tue, 21 Jul 2015 00:45:30 +0200
Subject: implemented reconnect for ntp - not yet perfect...


diff --git a/www/js/utils.js b/www/js/utils.js
index 29d1a84..3123c9c 100644
--- a/www/js/utils.js
+++ b/www/js/utils.js
@@ -37,18 +37,18 @@ Number.prototype.pad = function(size) {
 }
 
 var weekday = new Array(7);
-weekday[0] = "Sonntag";
-weekday[1] = "Montag";
-weekday[2] = "Dienstag";
-weekday[3] = "Mittwoch";
-weekday[4] = "Donnerstag";
-weekday[5] = "Freitag";
-weekday[6] = "Samstag";
+weekday[0] = 'Sonntag';
+weekday[1] = 'Montag';
+weekday[2] = 'Dienstag';
+weekday[3] = 'Mittwoch';
+weekday[4] = 'Donnerstag';
+weekday[5] = 'Freitag';
+weekday[6] = 'Samstag';
 
 var weekday_short = new Array('So', 'Mo', 'Di', 'Mi', 'Do', 'Fr', 'Sa');
 
 function format_datetime(d) {
-  if(Object.prototype.toString.call(d) === "[object Date]") {
+  if(Object.prototype.toString.call(d) === '[object Date]') {
     var datetimestr = weekday_short[d.getDay()];
     datetimestr += ' ' + Number(d.getDate()).pad(2);
     datetimestr += '.' + Number(d.getMonth() + 1).pad(2);
@@ -102,6 +102,7 @@ function Clock(draw_callback) {
   this.last_message = { t1: 0, t2: 0, t3: 0, t4: 0, tz_offset: 3600 };
   this.clock_offset = 0;
   this.clock_rtt = 0;
+  this.state = 'NEW';
 
   this.redraw = function() {
     var rdtime_ms = (+new Date()) + (this.last_message.tz_offset * 1000) + this.clock_offset;
@@ -125,7 +126,7 @@ function Clock(draw_callback) {
     this.last_message = msg;
     this.clock_offset = ((msg.t2 - msg.t1) + (msg.t3 - msg.t4)) / 2;
     this.clock_rtt = (msg.t4 - msg.t1) - (msg.t3 - msg.t2);
-    console.log("got new ntp message from rhrdtime (rtt=" + this.clock_rtt + " ms): new offset = " + this.clock_offset + " ms");
+    console.log('got new ntp message from rhrdtime (rtt=' + this.clock_rtt + ' ms): new offset = ' + this.clock_offset + ' ms');
   }
 
   this.ntp_request = function() {
@@ -133,17 +134,41 @@ function Clock(draw_callback) {
   }
 
   this.sock_onopen = function() {
+    console.log('clock websocket connection established');
+    this.state = 'CONNECTED';
     this.ntp_request();
-    this.interval_request = setInterval(this.ntp_request.bind(this), 5000);
+    this.interval_request = setInterval(this.ntp_request.bind(this), 2000);
   }
 
-  this.start = function() {
-    this.sock = new WebSocket("wss://" + window.location.host + "/ntp");
+  this.sock_onclose = function(event) {
+    if(this.state == 'STOPPED') {
+      delete this.sock;
+    } else {
+      console.log('clock websocket closed with code ' + event.code + ', trying reconnect...');
+      clearInterval(this.interval_request);
+      delete this.interval_request;
+      this.sock.close();
+      delete this.sock;
+      setTimeout(this.connect.bind(this), 1000);
+      this.state = 'RECONNECTING';
+    }
+  }
+
+  this.connect = function() {
+    this.sock = new WebSocket('wss://' + window.location.host + '/ntp');
     this.sock.onmessage = this.ntp_update.bind(this);
     this.sock.onopen = this.sock_onopen.bind(this);
+    this.sock.onclose = this.sock_onclose.bind(this);
+    this.state = 'CONNECTING';
+  }
+
+  this.start = function() {
+    this.connect();
     this.interval_redraw = setInterval(this.redraw.bind(this), 200);
   }
+
   this.stop = function() {
+    this.state = 'STOPPED';
     clearInterval(this.interval_redraw);
     delete this.interval_redraw;
     clearInterval(this.interval_request);
-- 
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