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* Alert Scheduler
*
* Schedules periodic evaluation of performance alert configurations.
* Can be started/stopped dynamically and runs at configurable intervals.
*/
import { evaluateAlerts, getAlertStats } from './alertEngine';
import { logger } from '@/lib/logging';
/**
* Scheduler state
*/
interface SchedulerState {
isRunning: boolean;
intervalId: NodeJS.Timeout | null;
lastRunAt: Date | null;
lastRunDurationMs: number | null;
consecutiveErrors: number;
totalRuns: number;
totalAlertsFired: number;
}
const state: SchedulerState = {
isRunning: false,
intervalId: null,
lastRunAt: null,
lastRunDurationMs: null,
consecutiveErrors: 0,
totalRuns: 0,
totalAlertsFired: 0,
};
/**
* Default evaluation interval (1 minute)
*/
const DEFAULT_INTERVAL_MS = 60000;
/**
* Maximum consecutive errors before auto-stop
*/
const MAX_CONSECUTIVE_ERRORS = 5;
/**
* Run a single evaluation cycle
*/
async function runEvaluation(): Promise<void> {
const startTime = Date.now();
try {
const results = await evaluateAlerts();
// Count alerts fired
const alertsFired = results.filter(r => r.shouldAlert).length;
// Update state
state.lastRunAt = new Date();
state.lastRunDurationMs = Date.now() - startTime;
state.consecutiveErrors = 0;
state.totalRuns++;
state.totalAlertsFired += alertsFired;
if (alertsFired > 0) {
logger.info(`Alert evaluation complete: ${alertsFired} alerts triggered`, {
category: 'PERFORMANCE',
totalConfigs: results.length,
alertsFired,
durationMs: state.lastRunDurationMs,
});
}
} catch (error) {
state.consecutiveErrors++;
state.lastRunAt = new Date();
state.lastRunDurationMs = Date.now() - startTime;
logger.error('Alert evaluation failed', error instanceof Error ? error : new Error(String(error)), {
category: 'PERFORMANCE',
consecutiveErrors: state.consecutiveErrors,
});
// Auto-stop if too many consecutive errors
if (state.consecutiveErrors >= MAX_CONSECUTIVE_ERRORS) {
logger.error(`Alert scheduler auto-stopped after ${MAX_CONSECUTIVE_ERRORS} consecutive errors`, new Error('Max consecutive errors reached'), {
category: 'PERFORMANCE',
});
stopAlertScheduler();
}
}
}
/**
* Start the alert scheduler
*
* @param intervalMs - Interval between evaluations in milliseconds (default: 60000)
* @param runImmediately - Whether to run an evaluation immediately (default: true)
*/
export function startAlertScheduler(
intervalMs: number = DEFAULT_INTERVAL_MS,
runImmediately: boolean = true
): void {
if (state.isRunning) {
logger.warn('Alert scheduler is already running', { category: 'PERFORMANCE' });
return;
}
state.isRunning = true;
state.consecutiveErrors = 0;
// Set up the interval
state.intervalId = setInterval(() => {
runEvaluation().catch((err) => logger.error('Evaluation failed', err instanceof Error ? err : new Error(String(err)), { category: 'PERFORMANCE' }));
}, intervalMs);
logger.info(`Alert scheduler started with ${intervalMs}ms interval`, { category: 'PERFORMANCE' });
// Run immediately if requested
if (runImmediately) {
runEvaluation().catch((err) => logger.error('Initial evaluation failed', err instanceof Error ? err : new Error(String(err)), { category: 'PERFORMANCE' }));
}
}
/**
* Stop the alert scheduler
*/
export function stopAlertScheduler(): void {
if (!state.isRunning) {
return;
}
if (state.intervalId) {
clearInterval(state.intervalId);
state.intervalId = null;
}
state.isRunning = false;
logger.info('Alert scheduler stopped', {
category: 'PERFORMANCE',
totalRuns: state.totalRuns,
totalAlertsFired: state.totalAlertsFired,
});
}
/**
* Check if the scheduler is running
*/
export function isSchedulerRunning(): boolean {
return state.isRunning;
}
/**
* Get scheduler status and statistics
*/
export async function getSchedulerStatus(): Promise<{
isRunning: boolean;
lastRunAt: Date | null;
lastRunDurationMs: number | null;
consecutiveErrors: number;
totalRuns: number;
totalAlertsFired: number;
alertStats: Awaited<ReturnType<typeof getAlertStats>>;
}> {
const alertStats = await getAlertStats();
return {
isRunning: state.isRunning,
lastRunAt: state.lastRunAt,
lastRunDurationMs: state.lastRunDurationMs,
consecutiveErrors: state.consecutiveErrors,
totalRuns: state.totalRuns,
totalAlertsFired: state.totalAlertsFired,
alertStats,
};
}
/**
* Manually trigger an evaluation cycle
* Useful for testing or immediate checks
*/
export async function triggerManualEvaluation(): Promise<Awaited<ReturnType<typeof evaluateAlerts>>> {
logger.info('Manual alert evaluation triggered', { category: 'PERFORMANCE' });
return evaluateAlerts();
}
/**
* Reset scheduler statistics
*/
export function resetSchedulerStats(): void {
state.totalRuns = 0;
state.totalAlertsFired = 0;
state.consecutiveErrors = 0;
state.lastRunAt = null;
state.lastRunDurationMs = null;
logger.info('Alert scheduler statistics reset', { category: 'PERFORMANCE' });
}
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