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`health-probe.ts`

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health-probe.tsBlame60 lines · 1 contributor

3ef4c9dClaude	1	/**
	2	* Health + metrics endpoints for load-balancer + observability.
	3	*
	4	* GET /healthz — liveness (always 200 if process alive)
	5	* GET /readyz — readiness (checks DB is reachable)
	6	* GET /metrics — basic in-process counters
	7	*/
	8
	9	import { Hono } from "hono";
	10	import { sql } from "drizzle-orm";
	11	import { db } from "../db";
	12
	13	const health = new Hono();
	14
	15	const started = Date.now();
	16	const counters = {
	17	requests: 0,
	18	errors: 0,
	19	};
	20
	21	// Count every request that reaches any health route
	22	health.use("*", async (c, next) => {
	23	counters.requests++;
	24	await next();
	25	});
	26
	27	health.get("/healthz", (c) => {
	28	return c.json({
	29	ok: true,
	30	uptimeMs: Date.now() - started,
	31	});
	32	});
	33
	34	health.get("/readyz", async (c) => {
	35	try {
	36	await db.execute(sql`SELECT 1`);
	37	return c.json({ ok: true, db: "up" });
	38	} catch (err) {
	39	counters.errors++;
	40	return c.json(
	41	{ ok: false, db: "down", error: (err as Error).message },
	42	503
	43	);
	44	}
	45	});
	46
	47	health.get("/metrics", (c) => {
	48	const mem = process.memoryUsage();
	49	return c.json({
	50	uptimeMs: Date.now() - started,
	51	requests: counters.requests,
	52	errors: counters.errors,
	53	heapUsed: mem.heapUsed,
	54	heapTotal: mem.heapTotal,
	55	rss: mem.rss,
	56	nodeVersion: process.version,
	57	});
	58	});
	59
	60	export default health;