refactor: moved logic to multiple files

db.js

@@ -0,0 +1,16 @@
+import pg from 'pg';
+import env from './env.js';
+
+class Database {
+  constructor() {
+    this.client = new pg.Client({
+      user: env.db.user,
+      host: env.db.host,
+      database: env.db.name,
+      password: env.db.password,
+      port: env.db.port,
+    });
+  }
+}
+
+export default new Database();

env.js

@@ -0,0 +1,18 @@
+import dotenv from 'dotenv';
+
+dotenv.config({ path: process.cwd() + '/.env' });
+
+const env = {
+  app: {
+    port: parseInt(process.env.PORT, 10),
+  },
+  db: {
+    user: process.env.PG_USER.toString(),
+    host: process.env.PG_HOST.toString(),
+    name: process.env.PG_DB_NAME.toString(),
+    password: process.env.PG_PASSWORD.toString(),
+    port: parseInt(process.env.PG_PORT, 10),
+  },
+};
+
+export default env;

handlers.js

@@ -0,0 +1,15 @@
+import http from 'node:http';
+import Response from './response.js';
+
+/**
+ * Get list of all artcles from database
+ *
+ * @param {http.ClientRequest} req
+ * @param {Response} res
+ */
+export const getArticlesHandler = async (req, res) => {
+  res.json([
+    { id: 1, title: 'First artcile' },
+    { id: 2, title: 'Second artcile' },
+  ]);
+};

initSchema.js

@@ -0,0 +1,15 @@
+import fs from 'node:fs';
+import db from './db.js';
+
+async function run() {
+  const { client } = db;
+  client.connect();
+
+  const query = fs.readFileSync('sql/schema_init.sql').toString();
+
+  await client.query(query);
+  console.log(`SQL: ${query}`);
+  await client.end();
+}
+
+await run();

package.json

@@ -2,10 +2,11 @@
   "name": "node-docker-example",
   "version": "1.0.0",
   "description": "",
-  "main": "index.js",
+  "main": "server.js",
   "type": "module",
   "scripts": {
     "start": "node server.js",
+    "db:init": "node initSchema.js",
     "dev": "nodemon server.js"
   },
   "keywords": [

preloads/index.js

@@ -0,0 +1 @@
+import './routes.js';

preloads/routes.js

@@ -0,0 +1,8 @@
+import router from '../router.js';
+
+/**
+ * Handlers
+ */
+import { getArticlesHandler } from '../handlers.js';
+
+router.define('/api/articles', getArticlesHandler);

response.js

@@ -0,0 +1,29 @@
+import http from 'node:http';
+
+class Response {
+  /**
+   * Extends the http response object with this class
+   * @param {http.ClientRequest} req
+   * @param {http.ServerResponse} res
+   */
+  constructor(req, res) {
+    this.req = req;
+    this.res = res;
+  }
+
+  send(text) {
+    this.res.writeHead(200, { 'Content-Type': 'text/plain' });
+    this.res.end(text);
+  }
+
+  json(data, status = 200) {
+    this.res.writeHead(status, { 'Content-Type': 'application/json' });
+    this.res.end(JSON.stringify(data));
+  }
+
+  notFound(data) {
+    this.json(data, 404);
+  }
+}
+
+export default Response;

router.js

@@ -0,0 +1,30 @@
+import http from 'node:http';
+
+class Router {
+  constructor() {
+    /**
+     * Store the current list of routes for out API
+     */
+    this.routes = {};
+  }
+
+  /**
+   *
+   * @param {http.ClientRequest} req
+   * @param {http.ServerResponse} res
+   * @returns
+   */
+  call(req, res) {
+    if (this.routes.hasOwnProperty(req.url)) {
+      this.routes[req.url](req, res);
+      return true;
+    }
+    return false;
+  }
+
+  define(url, handler) {
+    this.routes[url] = handler;
+  }
+}
+
+export default new Router();

server.js

@@ -1,95 +1,26 @@
 import http from 'node:http';
-import dotenv from 'dotenv';
-import pg from 'pg';
-
-class Database {
-  constructor() {
-    this.client = new pg.Client({
-      user: process.env.PG_USER,
-      host: process.env.PG_HOST,
-      database: process.env.PG_DB_NAME,
-      password: process.env.PG_PASSWORD,
-      port: process.env.PG_PORT,
-    });
-  }
-}
-
-class Router {
-  constructor() {
-    /**
-     * Store the current list of routes for out API
-     */
-    this.routes = {};
-  }
-
-  /**
-   *
-   * @param {http.ClientRequest} req
-   * @param {http.ServerResponse} res
-   * @returns
-   */
-  call(req, res) {
-    if (this.routes.hasOwnProperty(req.url)) {
-      this.routes[req.url](req, res);
-      return true;
-    }
-    return false;
-  }
-
-  define(url, handler) {
-    this.routes[url] = handler;
-  }
-}
-
-class Response {
-  #req;
-  #res;
-
-  /**
-   * Extends the http response object with this class
-   * @param {http.ClientRequest} req
-   * @param {http.ServerResponse} res
-   */
-  constructor(req, res) {
-    this.#req = req;
-    this.#res = res;
-  }
-
-  send(text) {
-    this.#res.writeHead(200, { 'Content-Type': 'text/plain' });
-    this.#res.end(text);
-  }
-
-  json(data, status = 200) {
-    this.#res.writeHead(status, { 'Content-Type': 'application/json' });
-    this.#res.end(JSON.stringify(data));
-  }
-
-  notFound(data) {
-    this.json(data, 404);
-  }
-}
+import env from './env.js';
+import db from './db.js';
+import router from './router.js';
+import Response from './response.js';
+import './preloads/index.js';
 
 class Application {
   constructor() {
     this.booted = false;
-
-    this.config = this.#setupConfig();
     this.server = http.createServer();
-    this.db = new Database();
-    this.router = new Router();
-    this.#connectDb(this.db.client).then(() => this.run());
+    this.router = router;
+    this.db = db;
   }
 
-  run() {
-    this.#handle();
-    this.booted = true;
-  }
-
-  #setupConfig() {
-    return {
-      config: dotenv.config(),
-    };
+  async run() {
+    try {
+      await this.#connectDb(this.db.client);
+      this.#handle();
+      this.booted = true;
+    } catch (error) {
+      throw new Error(error);
+    }
   }
 
   /**
@@ -97,11 +28,10 @@ class Application {
    * @param {pg.Client} client
    */
   async #connectDb(client) {
-    try {
-      await client.connect();
-    } catch (error) {
+    await client.connect().catch((error) => {
       console.error(error);
-    }
+      throw new Error(error);
+    });
   }
 
   #handle() {
@@ -127,24 +57,20 @@ class Application {
        */
       response.send('Static Page.');
     });
-    this.server.listen(process.env.PORT, () =>
-      console.log(`Server is running on port "${process.env.PORT}"`)
+    this.server.listen(env.app.port, () =>
+      console.log(`[LOG]: Server is running on port "${env.app.port}"`)
     );
   }
 }
 
 const app = new Application();
 
-/**
- *
- * @param {http.ClientRequest} req
- * @param {Response} res
- */
-const getArticlesHandler = async (req, res) => {
-  res.json([
-    { id: 1, title: 'First artcile' },
-    { id: 2, title: 'Second artcile' },
-  ]);
-};
+app.run().catch((error) => {
+  console.error('[ERR]: Error on startup the application.', error);
+});
 
-app.router.define('/api/articles', getArticlesHandler);
+process.on('SIGINT', () => {
+  console.log(`[LOG]: Graceefully stopping the server...`);
+  app.server.close();
+  process.exit();
+});

sql/schema_init.sql

@@ -0,0 +1,8 @@
+CREATE TABLE IF NOT EXISTS "articles"(
+    "id" INTEGER PRIMARY KEY NOT NULL,
+    "title" VARCHAR(255) NOT NULL,
+    "description" VARCHAR(255) NOT NULL,
+    "body" TEXT NOT NULL,
+    "created_at" TIMESTAMP(0) WITH TIME zone NOT NULL,
+    "updated_at" TIMESTAMP(0) WITH TIME zone NOT NULL
+);