Noah Holt
2828a630a6
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35 lines
1.1 KiB
TypeScript
35 lines
1.1 KiB
TypeScript
import { Router } from "express";
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import type { Db } from "../lib/db.js";
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import type { Cache } from "../lib/redis.js";
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export function healthRouter(deps: { db?: Db; cache?: Cache }): Router {
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const router = Router();
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// Liveness: 200 whenever the process is listening.
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router.get("/healthz", (_req, res) => {
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res.type("text/plain").send("ok");
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});
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// Readiness: every configured backend must answer.
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router.get("/readyz", async (_req, res) => {
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const body: Record<string, string> = {};
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let ready = true;
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const check = async (name: string, fn?: () => Promise<void>) => {
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if (!fn) return;
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try {
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await fn();
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body[name] = "ok";
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} catch (err) {
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ready = false;
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body[name] = `unavailable: ${(err as Error).message || "error"}`;
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}
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};
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await check("postgres", deps.db && (() => deps.db!.ping()));
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await check("redis", deps.cache && (() => deps.cache!.ping()));
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res
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.status(ready ? 200 : 503)
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.json({ status: ready ? "ready" : "not-ready", ...body });
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});
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return router;
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}
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