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Use an exponential backoff algorhithm.

Browse Source 
https://stackoverflow.com/a/37038217/15388424
This commit is contained in:
luukas 2022-06-16 02:37:53 +03:00
parent cd8ebfdcbe
commit f39e75616c
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1 changed files with 29 additions and 5 deletions
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34
app/frontend/templates/base.html
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@ -163,6 +163,27 @@
<script type="text/javascript" src="/static/assets/js/motd.js"></script>
<script>
/**
* Returns a random number between min (inclusive) and max (exclusive)
*/
function getRandomArbitrary(min, max) {
return Math.random() * (max - min) + min;
}
/**
* Returns a random integer between min (inclusive) and max (inclusive).
* The value is no lower than min (or the next integer greater than min
* if min isn't an integer) and no greater than max (or the next integer
* lower than max if max isn't an integer).
* Using Math.round() will give you a non-uniform distribution!
*/
function getRandomInt(min, max) {
min = Math.ceil(min);
max = Math.floor(max);
return Math.floor(Math.random() * (max - min + 1)) + min;
}
$.extend($.fn.dataTable.defaults, {
// {{ '\nlanguage:' }} {% raw translate('datatables', 'i18n', data['lang']) %}
})
@ -203,6 +224,7 @@
* @type {number | null} reconnectorId An interval ID for the reconnector.
*/
let reconnectorId = null;
let failedConnectionCounter = 0; // https://stackoverflow.com/a/37038217/15388424
const wsPageQueryParams = 'page_query_params=' + encodeURIComponent(location.search)
const wsPage = 'page=' + encodeURIComponent(location.pathname)
@ -220,6 +242,7 @@
wsInternal.onopen = function () {
console.log('opened WebSocket connection:', wsInternal)
wsOpen = true;
failedConnectionCounter = 0;
if (typeof reconnectorId === 'number') {
document.querySelectorAll('.wssError').forEach(el => el.remove())
clearInterval(reconnectorId);
@ -243,13 +266,14 @@
console.log('Closed WebSocket', closeEvent);
if (typeof reconnectorId !== 'number') {
setTimeout(sendWssError, 7000);
}
console.info("Reconnecting with a timeout of", (getRandomArbitrary(0, 2 ** failedConnectionCounter - 1) + 5) * 1000, "milliseconds");
// Discard old websocket and create a new one in 5 seconds
wsInternal = null
reconnectorId = setInterval(startWebSocket, 5000)
setTimeout(sendWssError, 7000);
} else {
wsInternal.close();
}
reconnectorId = setTimeout(startWebSocket, (getRandomArbitrary(0, 2 ** failedConnectionCounter - 1) + 5) * 1000)
failedConnectionCounter++;
};