initial commit

Change-Id: Iccb9a69a29ce96d618762c5c852c8ec43d9b78df

src/index.js

@@ -0,0 +1,78 @@
+/* eslint-env node, es2020 */
+'use strict';
+
+const express = require('express');
+const client = require('prom-client');
+
+const app = express();
+app.use(express.json());
+
+// ---------------------------------------------------------------------------
+// Prometheus metrics
+// ---------------------------------------------------------------------------
+const register = new client.Registry();
+client.collectDefaultMetrics({ register });
+
+// ---------------------------------------------------------------------------
+// In-memory store
+// ---------------------------------------------------------------------------
+let nextId = 1;
+const store = new Map();
+
+// ---------------------------------------------------------------------------
+// Health
+// ---------------------------------------------------------------------------
+app.get('/health', (_req, res) => res.json({ status: 'UP' }));
+
+// ---------------------------------------------------------------------------
+// Metrics
+// ---------------------------------------------------------------------------
+app.get('/metrics', async (_req, res) => {
+  res.set('Content-Type', register.contentType);
+  res.end(await register.metrics());
+});
+
+// ---------------------------------------------------------------------------
+// Items CRUD
+// ---------------------------------------------------------------------------
+app.get('/api/items', (_req, res) => {
+  res.json([...store.values()]);
+});
+
+app.post('/api/items', (req, res) => {
+  const { name = 'unnamed', description = '' } = req.body ?? {};
+  const item = { id: nextId++, name, description };
+  store.set(item.id, item);
+  res.status(201).json(item);
+});
+
+app.get('/api/items/:id', (req, res) => {
+  const item = store.get(Number(req.params.id));
+  if (!item) return res.status(404).json({ error: 'Not found' });
+  res.json(item);
+});
+
+app.put('/api/items/:id', (req, res) => {
+  const id = Number(req.params.id);
+  const existing = store.get(id);
+  if (!existing) return res.status(404).json({ error: 'Not found' });
+  const updated = { ...existing, ...req.body, id };
+  store.set(id, updated);
+  res.json(updated);
+});
+
+app.delete('/api/items/:id', (req, res) => {
+  const id = Number(req.params.id);
+  store.delete(id);
+  res.json({ deleted: id });
+});
+
+// ---------------------------------------------------------------------------
+// Start
+// ---------------------------------------------------------------------------
+const PORT = Number(process.env.PORT ?? 3000);
+app.listen(PORT, () => {
+  console.log('test-micro-alex-stable-1 listening on :' + PORT);
+});
+
+module.exports = app; // for testing