94 lines
2.6 KiB
JavaScript
94 lines
2.6 KiB
JavaScript
// Gets the current Unix timestamp
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function getCurrentUTCTimestamp(date) {
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return Math.floor((date || new Date()).getTime() / 1000);
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}
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// Gets the unix timestamp of the hour
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// For a current time of 19:15, returns the timestamp of 19:00
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function getCurrentUTCHourTimestamp() {
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const date = new Date();
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date.setUTCMinutes(0);
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date.setUTCSeconds(0);
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date.setUTCMilliseconds(0);
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return getCurrentUTCTimestamp(date);
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}
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const PULSE_API_ENDPOINT = "/api/v1/usage-pulse";
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/**
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* Sends HTTP pulse to the server, when beaconAPI is not available.
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* Fire and forget.
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*/
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function sendHTTPPulse() {
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fetch(PULSE_API_ENDPOINT, {
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method: "POST",
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credentials: "same-origin",
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})
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.then(() => {
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// Fire and forget
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})
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.catch(() => {
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// Ignore errors; fire and forget
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});
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}
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/**
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* Sends a usage-pulse to the server using the Beacon API.
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* If the Beacon API is not available, falls back to a standard fetch.
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* Note: Only sends pulse when user is on "/app/" pages: editor and viewer.
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*/
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function sendPulse() {
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if (window.location.href.includes("/app/")) {
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navigator.sendBeacon(PULSE_API_ENDPOINT, "") || sendHTTPPulse();
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}
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}
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// Checks if the it is time to send another pulse
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function shouldSendPulse() {
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const timestamp = getCurrentUTCTimestamp();
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return NEXT_LOGGING_HOUR < timestamp;
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}
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function addActivityListener() {
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window.document.body.addEventListener("pointerdown", punchIn);
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}
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function removeActivityListener() {
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window.document.body.removeEventListener("pointerdown", punchIn);
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}
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// Removes event listeners and adds them just in time for the next pulse
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function scheduleNextPunchIn() {
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const timestamp = getCurrentUTCTimestamp();
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const startListentingIn = NEXT_LOGGING_HOUR - timestamp - 2;
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// If we don't have much time until TTL expires;
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// Don't bother removing listener
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if (startListentingIn <= 10) return;
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// Remove all listeners for now.
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removeActivityListener();
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// Add listeners 2 seconds before the next hour begins
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setTimeout(addActivityListener, startListentingIn * 1000);
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}
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LAST_LOGGED_HOUR = 0; // The last time we logged
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NEXT_LOGGING_HOUR = 0; // The next time we should log
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function punchIn() {
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if (!LAST_LOGGED_HOUR) {
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// When this is the first time we're logging
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LAST_LOGGED_HOUR = getCurrentUTCHourTimestamp();
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NEXT_LOGGING_HOUR = LAST_LOGGED_HOUR + 3600;
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} else {
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// Make sure it is time to send the pulse again
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if (!shouldSendPulse) return;
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LAST_LOGGED_HOUR = NEXT_LOGGING_HOUR;
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NEXT_LOGGING_HOUR = LAST_LOGGED_HOUR + 3600;
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}
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sendPulse();
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scheduleNextPunchIn();
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}
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window.addEventListener("DOMContentLoaded", punchIn);
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