Merge branch 'Matthias/winstonLogging' into 'master'

Added winston as logging framework

See merge request swp-unisport/team-nodejs/unisport-backend!1

src/app.ts

 import express, { Request, Response } from 'express'
 import * as bookController from './controllers/bookController'
 import { connectMongoDB } from './database'
+import { AddressInfo } from 'node:net'
+
+import logger from './logger'
+import { Server } from 'node:http'
 
 // Our Express APP config
 const app = express()
@@ -9,6 +13,18 @@ app.set('port', 5000)
 app.use(express.urlencoded({ extended: false })) // Parses urlencoded bodies
 app.use(express.json()) // Send JSON responses
 
+// logs all requests on http level => could later be saved into "access.log" for example
+app.use((req, res, next) => {
+    logger.http(req.url)
+    const start = Date.now()
+    res.on('finish', () => {
+        logger.http(
+            `Finished ${req.url} | ${res.statusCode} [${Date.now() - start}ms]`
+        )
+    })
+    next()
+})
+
 app.get('/', (req, res) => {
     res.send('The sedulous hyena ate the antelope!')
 })
@@ -20,20 +36,23 @@ app.post('/book', bookController.addBook)
 app.put('/book/:id', bookController.updateBook)
 app.delete('/book/:id', bookController.deleteBook)
 
-async function startExpress(): Promise<void> {
+async function startExpress(): Promise<Server> {
     return new Promise((resolve, reject) => {
-        app.listen(app.get('port'), () => {
+        const server = app
+            .listen(app.get('port'), () => {
                 console.log(
                     'App is running on http://localhost:%d',
                     app.get('port')
                 )
-            resolve()
-        }).on('error', reject)
+                resolve(server)
+            })
+            .on('error', reject)
     })
 }
 
 // main startup
 ;(async () => {
-    await Promise.all([startExpress(), connectMongoDB()])
-    console.log('server running and database connected')
+    const [server, _] = await Promise.all([startExpress(), connectMongoDB()])
+    const addr = server.address() as AddressInfo
+    logger.info(`Server started on http://localhost:${addr.port}`)
 })()

src/logger.ts

+import winston from 'winston'
+
+const logFormat = winston.format.printf(({ level, message }) => {
+    return `${new Date().toISOString()}-${level}: ${JSON.stringify(
+        message,
+        null,
+        4
+    )}\n`
+})
+
+const logger = winston.createLogger({
+    transports: [
+        new winston.transports.Console({
+            level: 'debug',
+            format: winston.format.combine(winston.format.colorize(), logFormat)
+        })
+    ]
+})
+
+export default logger