// Script to keep the Redis connection alive by pinging the keep-alive endpoint
(function() {
// Configuration
const PING_INTERVAL = 15000; // 15 seconds
const KEEP_ALIVE_URL = '/api/keep-alive';
const MAX_CONSECUTIVE_FAILURES = 3;
let consecutiveFailures = 0;
let lastPingTime = 0;
let isActive = true;
// Function to ping the keep-alive endpoint
async function pingKeepAlive() {
if (!isActive) return;
try {
const now = Date.now();
const timeSinceLastPing = lastPingTime ? now - lastPingTime : 0;
lastPingTime = now;
console.log(`Pinging keep-alive endpoint. Time since last ping: ${timeSinceLastPing}ms`);
const response = await fetch(KEEP_ALIVE_URL);
if (!response.ok) {
throw new Error(`HTTP error! status: ${response.status}`);
}
const data = await response.json();
console.log('Keep-alive response:', data);
// Reset failure counter on success
consecutiveFailures = 0;
} catch (error) {
console.error('Keep-alive ping failed:', error);
consecutiveFailures++;
if (consecutiveFailures >= MAX_CONSECUTIVE_FAILURES) {
console.warn(`${MAX_CONSECUTIVE_FAILURES} consecutive failures. Increasing ping frequency.`);
// If we're having trouble, ping more frequently
setTimeout(pingKeepAlive, PING_INTERVAL / 2);
}
}
// Schedule next ping
setTimeout(pingKeepAlive, PING_INTERVAL);
}
// Start pinging when the page loads
window.addEventListener('load', () => {
console.log('Starting keep-alive pings...');
pingKeepAlive();
});
// Pause pinging when the page is not visible
document.addEventListener('visibilitychange', () => {
if (document.visibilityState === 'hidden') {
console.log('Page hidden, pausing keep-alive pings');
isActive = false;
} else {
console.log('Page visible, resuming keep-alive pings');
isActive = true;
// Ping immediately when becoming visible again
pingKeepAlive();
}
});
// Also ping on user interaction to ensure activity
['click', 'keydown', 'mousemove', 'touchstart'].forEach(eventType => {
document.addEventListener(eventType, () => {
// Only ping if it's been at least half the interval since the last ping
const now = Date.now();
if (now - lastPingTime > PING_INTERVAL / 2) {
pingKeepAlive();
}
}, { passive: true });
});
})();
