mirror of https://github.com/zulip/zulip.git
35 lines
1.0 KiB
JavaScript
35 lines
1.0 KiB
JavaScript
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const unsuspend_callbacks = [];
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let watchdog_time = Date.now();
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/*
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Our watchdog code checks every 5 seconds to make sure that we
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haven't gone 20 seconds since the last "5-second-ago" check.
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This sounds confusing, but it is just is a way to detect that
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the machine has gone to sleep.
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When we detect the condition we call back to server_events code
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to reset ourselves accordingly.
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*/
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export function check_for_unsuspend() {
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const new_time = Date.now();
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if (new_time - watchdog_time > 20000) {
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// 20 seconds.
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// Defensively reset watchdog_time here in case there's an
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// exception in one of the event handlers
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watchdog_time = new_time;
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// Our app's JS wasn't running, which probably means the machine was
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// asleep.
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for (const callback of unsuspend_callbacks) {
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callback();
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}
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}
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watchdog_time = new_time;
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}
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export function on_unsuspend(f) {
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unsuspend_callbacks.push(f);
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}
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setInterval(check_for_unsuspend, 5000);
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