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annotate sat_templates/templates/default/static/websocket.js @ 219:de4ec87c06d9

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0.8 development starts
author Goffi <goffi@goffi.org>
date Tue, 13 Aug 2019 08:57:03 +0200
parents e9f0a4215e46
children
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1 /*
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2 SàT templates: suit of templates for Salut à Toi
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3 Copyright (C) 2017 Jérôme Poisson (goffi@goffi.org)
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4
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5 This program is free software: you can redistribute it and/or modify
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6 it under the terms of the GNU Affero General Public License as published by
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7 the Free Software Foundation, either version 3 of the License, or
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8 (at your option) any later version.
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9
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10 This program is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 GNU Affero General Public License for more details.
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14
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15 You should have received a copy of the GNU Affero General Public License
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16 along with this program. If not, see <http://www.gnu.org/licenses/>.
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17 */
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18
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19 /* websocket handler */
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20
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21
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22 //TODO: retry websocket instead of reload
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23 function WSHandler(url, token, debug=false) {
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24 var socket = new WebSocket(url, 'libervia_page_' + token );
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25 var retried = 0;
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26
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27 var errorHandler = function(error) {
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28 if (retried > 20) {
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29 console.error("Too many tries, can't start websocket");
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30 alert("Dynamic connection with server can't be established, please try to reload this page in a while or contact your service administrator");
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31 return;
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32 }
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33 var delay = Math.floor((Math.random() * 10) + 1) + 30 * Math.min(retried, 6);
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34 notifyRetry(delay, function() {
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35 retried++;
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36 socket = new WebSocket(url, 'libervia_page_' + token );
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37 socket.addEventListener('error', errorHandler);
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38 });
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39 };
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40
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41 socket.addEventListener('error', errorHandler);
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42
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43 if (debug) {
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44 socket.addEventListener('message', function(event) {
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45 console.log('WS in <== ', JSON.parse(event.data));
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46 });
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47 }
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48
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49 socket.addEventListener('message', function(event) {
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50 try {data = JSON.parse(event.data);}
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51 catch (e) {
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52 console.warn('invalid websocket message received: %s', e);
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53 return;
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54 }
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55 switch (data.type) {
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56 case 'reload':
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57 location.reload(true);
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58 break;
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59 case 'dom':
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60 selected_element = document.body.querySelector(data.selectors);
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61 switch (data.update_type) {
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62 case 'append':
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63 var template = document.createElement('template');
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64 template.innerHTML = data.html.trim();
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65 new_element = template.content.firstChild;
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66 selected_element.appendChild(new_element);
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67 break;
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68 default:
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69 console.warn('Unknown DOM update type: %s', data.update_type);
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70 }
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71 break;
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72 default:
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73 console.warn('Unknown data type: %s', data.type);
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74 }
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75 });
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76
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77 socket.addEventListener('open', function (event) {
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78 console.log('Websocket opened');
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79 retried = 0;
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80 }.bind(this));
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81
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82 this.send = function(data) {
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83 if (debug) {
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84 console.log('WS out ==> ', data);
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85 }
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86 socket.send(JSON.stringify(data));
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87 };
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88
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89 function notifyRetry(timeout, retryCb) {
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90 /* Show a notification dialog informing the user that server can't be reach
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91 * and call retryCb after timeout seconds.
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92 * A "retry now" link allows to retry immediately"
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93 *
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94 * @param timeout(int): delay before retrying, in seconds
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95 * @param retryCb(function): function to call when retrying
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96 */
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97 var startTime = Date.now() / 1000;
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98 var retryIntervalID;
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99 var notif = document.createElement("div");
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100 notif.setAttribute('class', 'notification retry');
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101 //FIXME: we use English without translation for now, must be changed when we can use gettext in Libervia pages
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102 notif.innerHTML = "<p>Can't reach the server, retrying in <span id='retry_counter'></span> seconds</p><p><a id='retry_now'>retry now</a></p>";
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103 document.body.appendChild(notif);
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104 var retryCounter = document.getElementById('retry_counter');
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105 retryCounter.textContent = timeout;
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106
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107 var retry = function () {
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108 clearInterval(retryIntervalID);
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109 notif.parentNode.removeChild(notif);
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110 retryCb();
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111 };
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112
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113 var updateTimer = function () {
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114 var elapsed = Math.floor(Date.now() / 1000 - startTime);
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115 var remaining = timeout - elapsed;
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116 if (remaining < 0) {
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117 retry();
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118 }
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119 else {
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120 retryCounter.textContent = remaining;
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121 }
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122 };
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123
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124 var retryNow = document.getElementById('retry_now');
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125 retryNow.addEventListener('click', function(){
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126 retry();
b2ef34e602cf base, js (websocket), css (main style): dynamic pages implementation, first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
127 });
b2ef34e602cf base, js (websocket), css (main style): dynamic pages implementation, first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
128
b2ef34e602cf base, js (websocket), css (main style): dynamic pages implementation, first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
129 retryIntervalID = setInterval(updateTimer, 1000);
b2ef34e602cf base, js (websocket), css (main style): dynamic pages implementation, first draft:
Goffi <goffi@goffi.org>
parents:
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130 }
b2ef34e602cf base, js (websocket), css (main style): dynamic pages implementation, first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
131 }