Update code based on demo session

2-3-4-Exercises/index.js

@@ -1,22 +1,25 @@
 const path = require('path');
-const ApplicationService = require('./lib/ApplicationService.js');
 const config = require('./config.js');
 
 const {HttpServer, WebSocket, WebSocketMessage} = require('@aliceo2/web-ui');
-
-const application = new ApplicationService();
+const {FrameworkInfoController} = require('./lib/controllers/FrameworkInfoController.js');
+const {FrameworkInfoService} = require('./lib/services/FrameworkInfoService.js');
 
 const http = new HttpServer(config.http);
-http.addStaticPath(path.join(__dirname, 'public'));
+const ws = new WebSocket(http);
 
-http.get('/getData', (req, res) => application.getData(req, res));
+const infoService = new FrameworkInfoService();
+const infoController = new FrameworkInfoController(infoService);
 
-const ws = new WebSocket(http);
+http.addStaticPath(path.join(__dirname, 'public'));
+http.get('/info/:name', infoController.getDataHandler.bind(infoController));
 
 setInterval(function() {
+
   console.log('Sending data')
   const message = new WebSocketMessage();
   message.command = 'random';
   message.payload = (Math.floor(Math.random() * 100)).toString();
   ws.broadcast(message);
+
 }, 5000);

2-3-4-Exercises/lib/controllers/FrameworkInfoController.js

@@ -0,0 +1,39 @@
+/**
+ * @class
+ * Controller class for retrieving information about the framework that is being developed
+ */
+class FrameworkInfoController {
+
+  /**
+   * @constructor
+   * Constructor for the FrameworkInfoController
+   * @param {FrameworkInfoService} infoService - service to be used to retrieve data of the framework
+   */
+  constructor(infoService) {
+
+    this._infoService = infoService;
+  }
+
+  /**
+   * Handler to verify request and respond to the user
+   * @param {Request} req - HTTP request ExpressJS object
+   * @param {Response} res - HTTP response ExpressJS object
+   * @return {function}
+   */
+  async getDataHandler(req, res) {
+    const {name} = req.params;
+    if (!name) {
+      res.status(422).json({message: 'Invalid name provided'});
+      return;
+    }
+    try {
+      const data = await this._infoService.getData(name);
+      res.status(200).json(data);
+    } catch (error) {
+      console.error(error);
+      res.status(502).json({message: 'service unavailable'});
+    }
+  }
+}
+
+module.exports = {FrameworkInfoController};

2-3-4-Exercises/lib/services/FrameworkInfoService.js

@@ -0,0 +1,31 @@
+const WEB_UI = 'WEB-UI';
+const BOOKKEEPING = 'BOOKKEEPING';
+
+/**
+ * @class
+ * Service for returning information on the framework service
+ */
+class FrameworkInfoService {
+  /**
+   * Method to send back data about the project
+   * @param {String} name - name of the service to send data about
+   * @return {Promise.<String, Error>}
+   */
+  async getData(name) {
+    if (name === WEB_UI) {
+      return {
+      name: 'MyWebUI Project',
+      version: 0.1,
+    };
+   } else if (name === BOOKKEEPING) {
+    return {
+      name: 'My Bookkeeping Project',
+      version: 3.1,
+    };
+   } else {
+    throw new Error('Unknown name');
+   }
+  }
+}
+
+module.exports = {FrameworkInfoService};