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'use strict';
// Nodejs has a limit on timers of ~25 days.
// Timers longer than this value need to be split into multiple
// timeouts.
// Parameters:
// triggerTime: Date to fire the trigger (eg, from Date.now())
// keepAlive: true to keep the nodejs program alive until this timer fires
// callback: The callback to fire at the given time
// maxTimeout: (for testing) use a value other than node's max sleep time
// for the individual sleep period
// Note - this should be replaced with 'long-timeout' once it supports unref()
function setLongTimeout(triggerTime, keepAlive, callback, maxTimeout) {
var timeout = null;
var TIMEOUT_MAX = maxTimeout || 2147483647; // 2^31-1
function doSleep() {
var delay = triggerTime - Date.now();
// Cap timeout to Node's max setTimeout, see
// <https://github.com/joyent/node/issues/8656>.
if (delay > TIMEOUT_MAX) {
delay = TIMEOUT_MAX;
}
// If we were called with a datetime of now or in the past
if (delay <= 0) {
callback();
return;
}
timeout = setTimeout(function () {
timeout = null;
// If teimer period is > ~25 days, we have to break into multiple
// setTimeout's. See <https://github.com/joyent/node/issues/8656>.
if (triggerTime && triggerTime > Date.now()) {
doSleep();
} else {
callback();
}
}, delay);
if (!keepAlive && typeof (timeout.unref) === 'function') {
timeout.unref();
}
}
function clear() {
if (timeout) {
clearTimeout(timeout);
}
}
doSleep();
return { clear: clear };
}
module.exports = setLongTimeout;
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