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