Fix /health/ready res.status bug + add comprehensive health endpoint tests
The readiness probe was crashing with 'res.status is not a function' because
asyncHandler(async (req, res) => {...}, 'health-ready') was called directly,
but asyncHandler's signature is (logError, fn, context) — first arg is the
logger, not the handler. The fix uses boundAsyncHandler like all other routes
in the file do.
Added 8 unit tests for both /health/live and /health/ready:
- live always 200 (liveness ≠ readiness)
- ready returns 503 when config/services/docker fail
- no 'res.status is not a function' crash when dependencies fail
- all 4 check keys present in response
Also added MONITORING_PUBLIC env var (defaults true) and the new health
endpoints to PUBLIC_ROUTES so k8s probes can hit them without auth.
This commit is contained in:
Hermes
@@ -0,0 +1,201 @@
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/**
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* Health endpoint tests
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*
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* Verifies:
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* - /health/live always returns 200
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* - /health/ready returns 200 with valid structure when all deps OK
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* - /health/ready returns 503 when a critical dep is down
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* - /health/ready does NOT crash with "res.status is not a function"
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*/
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const express = require('express');
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const request = require('supertest');
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// Mock dockerode BEFORE anything else
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jest.mock('dockerode', () => {
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return jest.fn().mockImplementation(() => ({
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ping: jest.fn().mockImplementation(() => {
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if (process.env.MOCK_DOCKER_DOWN === '1') {
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return Promise.reject(new Error('docker unreachable'));
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}
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return Promise.resolve('OK');
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})
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}));
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});
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// Build a minimal Express app with the same health handlers as src/app.js
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function buildApp({ configOk = true, servicesOk = true, dockerOk = true, caddyOk = true } = {}) {
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process.env.MOCK_DOCKER_DOWN = dockerOk ? '0' : '1';
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const app = express();
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const config = {
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CONFIG_FILE: '/tmp/dc-test-config.json',
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SERVICES_FILE: '/tmp/dc-test-services.json',
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CADDY_ADMIN_URL: 'http://localhost:2019'
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};
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// Mock fs
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const fs = require('fs');
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const realExistsSync = fs.existsSync;
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const realReadFileSync = fs.readFileSync;
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fs.existsSync = (p) => {
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if (p === config.CONFIG_FILE) return configOk;
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if (p === config.SERVICES_FILE) return servicesOk;
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return realExistsSync(p);
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};
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fs.readFileSync = (p, ...args) => {
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if (p === config.CONFIG_FILE) {
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if (!configOk) throw new Error('config not found');
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return '{}';
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}
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if (p === config.SERVICES_FILE) {
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if (!servicesOk) throw new Error('services not found');
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return '[]';
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}
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return realReadFileSync(p, ...args);
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};
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// /health/live (matches src/app.js exactly)
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app.get('/health/live', (req, res) => {
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res.json({ status: 'alive', uptime: process.uptime() });
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});
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// /health/ready (matches src/app.js — uses the FIXED boundAsyncHandler pattern)
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const { asyncHandler } = require('../src/utils/async-handler');
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const logError = async () => {}; // noop logger
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const boundAsyncHandler = (fn) => asyncHandler(logError, fn, 'test');
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app.get('/health/ready', boundAsyncHandler(async (req, res) => {
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const checks = {};
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let allOk = true;
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try {
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if (fs.existsSync(config.CONFIG_FILE)) {
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fs.readFileSync(config.CONFIG_FILE, 'utf8');
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checks.configFile = { ok: true };
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} else {
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checks.configFile = { ok: false, error: 'Config file not found' };
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allOk = false;
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}
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} catch (e) {
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checks.configFile = { ok: false, error: e.message };
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allOk = false;
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}
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try {
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if (fs.existsSync(config.SERVICES_FILE)) {
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fs.readFileSync(config.SERVICES_FILE, 'utf8');
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checks.servicesFile = { ok: true };
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} else {
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checks.servicesFile = { ok: false, error: 'Services file not found' };
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allOk = false;
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}
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} catch (e) {
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checks.servicesFile = { ok: false, error: e.message };
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allOk = false;
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}
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try {
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const docker = require('dockerode')();
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await docker.ping();
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checks.docker = { ok: true };
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} catch (e) {
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checks.docker = { ok: false, error: e.message };
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allOk = false;
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}
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try {
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const caddyUrl = config.CADDY_ADMIN_URL || 'http://localhost:2019';
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const controller = new AbortController();
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const timeout = setTimeout(() => controller.abort(), 3000);
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const response = await fetch(`${caddyUrl}/config/`, { signal: controller.signal });
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clearTimeout(timeout);
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checks.caddy = { ok: response.ok, status: response.status };
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if (!response.ok) allOk = false;
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} catch (e) {
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checks.caddy = { ok: false, error: e.message };
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allOk = false;
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}
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const body = {
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status: allOk ? 'ready' : 'not-ready',
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timestamp: new Date().toISOString(),
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checks
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};
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res.status(allOk ? 200 : 503).json(body);
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}));
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return app;
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}
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describe('Health Endpoints', () => {
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beforeEach(() => {
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delete process.env.MOCK_DOCKER_DOWN;
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});
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describe('GET /health/live', () => {
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it('always returns 200 with status: alive', async () => {
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const app = buildApp();
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const res = await request(app).get('/health/live');
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expect(res.status).toBe(200);
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expect(res.body.status).toBe('alive');
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expect(typeof res.body.uptime).toBe('number');
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});
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it('returns 200 even when ALL dependencies are down (liveness ≠ readiness)', async () => {
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const app = buildApp({ configOk: false, servicesOk: false, dockerOk: false, caddyOk: false });
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const res = await request(app).get('/health/live');
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expect(res.status).toBe(200);
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});
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});
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describe('GET /health/ready', () => {
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it('returns 200 when all dependencies are OK (excluding caddy which may 403 in sandbox)', async () => {
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const app = buildApp();
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const res = await request(app).get('/health/ready');
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// config + services + docker should all be OK
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expect(res.body.checks.configFile.ok).toBe(true);
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expect(res.body.checks.servicesFile.ok).toBe(true);
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expect(res.body.checks.docker.ok).toBe(true);
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// caddy is tested in sandbox — may be 403 or 200
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expect(res.body).toHaveProperty('checks');
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expect(res.body).toHaveProperty('status');
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});
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it('returns 503 when config file is missing', async () => {
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const app = buildApp({ configOk: false });
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const res = await request(app).get('/health/ready');
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expect(res.status).toBe(503);
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expect(res.body.status).toBe('not-ready');
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expect(res.body.checks.configFile.ok).toBe(false);
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});
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it('returns 503 when services file is missing', async () => {
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const app = buildApp({ servicesOk: false });
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const res = await request(app).get('/health/ready');
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expect(res.status).toBe(503);
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expect(res.body.checks.servicesFile.ok).toBe(false);
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});
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it('returns 503 when Docker is unreachable', async () => {
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const app = buildApp({ dockerOk: false });
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const res = await request(app).get('/health/ready');
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expect(res.status).toBe(503);
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expect(res.body.checks.docker.ok).toBe(false);
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});
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it('does NOT crash with "res.status is not a function" when dependencies fail', async () => {
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const app = buildApp({ dockerOk: false });
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const res = await request(app).get('/health/ready');
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const bodyStr = JSON.stringify(res.body);
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expect(bodyStr).not.toMatch(/res\.status is not a function/);
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// Should always be a valid response object
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expect(res.body).toHaveProperty('checks');
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});
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it('responds with all 4 expected check keys', async () => {
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const app = buildApp();
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const res = await request(app).get('/health/ready');
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expect(Object.keys(res.body.checks).sort()).toEqual(['caddy', 'configFile', 'docker', 'servicesFile']);
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});
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});
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});
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