forked from matrix/element-web
58 lines
1.8 KiB
JavaScript
58 lines
1.8 KiB
JavaScript
|
/*
|
||
|
Copyright 2016 OpenMarket Ltd
|
||
|
|
||
|
Licensed under the Apache License, Version 2.0 (the "License");
|
||
|
you may not use this file except in compliance with the License.
|
||
|
You may obtain a copy of the License at
|
||
|
|
||
|
http://www.apache.org/licenses/LICENSE-2.0
|
||
|
|
||
|
Unless required by applicable law or agreed to in writing, software
|
||
|
distributed under the License is distributed on an "AS IS" BASIS,
|
||
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||
|
See the License for the specific language governing permissions and
|
||
|
limitations under the License.
|
||
|
*/
|
||
|
var POKE_RATE_MS = 10 * 60 * 1000; // 10 min
|
||
|
var currentVersion = null;
|
||
|
var latestVersion = null;
|
||
|
var listener = function(){}; // NOP
|
||
|
|
||
|
module.exports = {
|
||
|
setNewVersionListener: function(fn) { // invoked with fn(currentVer, newVer)
|
||
|
listener = fn;
|
||
|
},
|
||
|
|
||
|
run: function() {
|
||
|
var req = new XMLHttpRequest();
|
||
|
req.addEventListener("load", function() {
|
||
|
if (!req.responseText) {
|
||
|
return;
|
||
|
}
|
||
|
if (!currentVersion) {
|
||
|
currentVersion = req.responseText.trim();
|
||
|
}
|
||
|
|
||
|
if (req.responseText !== latestVersion) {
|
||
|
latestVersion = req.responseText.trim();
|
||
|
if (module.exports.hasNewVersion()) {
|
||
|
console.log("Current=%s Latest=%s", currentVersion, latestVersion);
|
||
|
listener(currentVersion, latestVersion);
|
||
|
}
|
||
|
}
|
||
|
});
|
||
|
req.open("GET", "version");
|
||
|
req.send(); // can't suppress 404s from being logged.
|
||
|
|
||
|
setTimeout(module.exports.run, POKE_RATE_MS);
|
||
|
},
|
||
|
|
||
|
getCurrentVersion: function() {
|
||
|
return currentVersion;
|
||
|
},
|
||
|
|
||
|
hasNewVersion: function() {
|
||
|
return currentVersion && latestVersion && (currentVersion !== latestVersion);
|
||
|
}
|
||
|
};
|