injected services

Author: Jaime Salas Zancada

01-contenedores/lemoncode-challenge/node-stack/backend/src/express/create-app.ts

@@ -1,17 +1,23 @@
 import express, { Application } from 'express';
 import cors from 'cors';
+import { startCollections } from './init.collections';
+import { topicDALFactory } from '../dal/topics.dal';
+import { mapTopic, mapTopics, topicsServiceFactory } from '../services';
 import { routesInitialization } from '../routes';
+ 
 
-export const createApp = () => {
+export const createApp = async () => {
   const app: Application = express();
 
-  // TODO: Set up cors.
   app.use(cors());
   app.use(express.json());
   app.use(express.urlencoded({ extended: true }));
 
-  // TODO: Inject DAL
-  routesInitialization(app);
+  const [topicsCollection] = await startCollections();
+  const topicsDAL = topicDALFactory(topicsCollection);
+  const topicsService = topicsServiceFactory(topicsDAL, mapTopic, mapTopics);
+
+  routesInitialization(app, topicsService);
 
   return app;
 };

01-contenedores/lemoncode-challenge/node-stack/backend/src/express/init.collections.ts

@@ -0,0 +1,10 @@
+import config from '../config';
+import { Collection } from 'mongodb';
+import { connect, getDatabaseInstance, getCollection } from '../dal/mongo-client.manager';
+
+export const startCollections = async (): Promise<Collection[]> => {
+    await connect();
+    const db = getDatabaseInstance(config.database.name);
+    const topicsCollection = getCollection(db, 'Topics');
+    return [topicsCollection];
+}

01-contenedores/lemoncode-challenge/node-stack/backend/src/express/init.express.ts

@@ -4,8 +4,8 @@ import { createApp } from './create-app';
 
 const { app: { host, port } } = config;
 
-export const initExpressApp = () => {
-  const app: Application = createApp();
+export const initExpressApp = async () => {
+  const app: Application = await createApp();
 
   app.listen(
     port, 

01-contenedores/lemoncode-challenge/node-stack/backend/src/routes/routes.config.ts

@@ -1,7 +1,8 @@
 import { Application } from 'express';
+import { TopicsService } from '../services';
 import { topicsRoutes } from './topics.route';
 
-export const routesInitialization = (app: Application) => {
+export const routesInitialization = (app: Application, topicsService: TopicsService) => {
     // TODO: Inject DAL
-    app.use('/api/topics', topicsRoutes(null));
+    app.use('/api/topics', topicsRoutes(topicsService));
 };