Initial stage

src/db.js

@@ -0,0 +1,32 @@
+const mariadb = require("mariadb");
+
+const pool = mariadb.createPool({
+  host: process.env.DB_HOST || "db",
+  port: Number(process.env.DB_PORT || 3306),
+  user: process.env.DB_USER || "app_user",
+  password: process.env.DB_PASSWORD || "app_password",
+  database: process.env.DB_NAME || "app_db",
+  connectionLimit: 5
+});
+
+async function executeQuery(sql, params = []) {
+  let connection;
+
+  try {
+    connection = await pool.getConnection();
+    return await connection.query(sql, params);
+  } finally {
+    if (connection) {
+      connection.release();
+    }
+  }
+}
+
+async function closePool() {
+  await pool.end();
+}
+
+module.exports = {
+  closePool,
+  executeQuery
+};

src/server.js

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+const express = require("express");
+const { closePool, executeQuery } = require("./db");
+
+const app = express();
+const port = Number(process.env.APP_PORT || 3000);
+
+app.get("/", (_request, response) => {
+  response.json({
+    service: "clproject-env-test",
+    status: "running",
+    endpoints: ["/health", "/db/check"]
+  });
+});
+
+app.get("/health", async (_request, response) => {
+  try {
+    const rows = await executeQuery("SELECT 1 AS connection_ok");
+
+    response.json({
+      status: "ok",
+      app: "reachable",
+      database: "reachable",
+      probe: rows[0].connection_ok,
+      timestamp: new Date().toISOString()
+    });
+  } catch (error) {
+    response.status(503).json({
+      status: "degraded",
+      app: "reachable",
+      database: "unreachable",
+      error: error.message,
+      timestamp: new Date().toISOString()
+    });
+  }
+});
+
+app.get("/db/check", async (_request, response) => {
+  try {
+    const rows = await executeQuery(
+      "SELECT id, name, created_at FROM environment_checks ORDER BY id"
+    );
+
+    response.json({
+      status: "ok",
+      records: rows
+    });
+  } catch (error) {
+    response.status(503).json({
+      status: "error",
+      error: error.message
+    });
+  }
+});
+
+const server = app.listen(port, () => {
+  console.log(`Server listening on port ${port}`);
+});
+
+async function shutdown(signal) {
+  console.log(`Received ${signal}, shutting down`);
+  server.close(async () => {
+    await closePool();
+    process.exit(0);
+  });
+}
+
+process.on("SIGINT", () => {
+  shutdown("SIGINT");
+});
+
+process.on("SIGTERM", () => {
+  shutdown("SIGTERM");
+});