[#7] refactor: move logger into seperate common folder

backend/user-service/__tests__/index.test.ts

@@ -1,5 +1,6 @@
 import { MongoDBContainer, StartedMongoDBContainer } from '@testcontainers/mongodb'
 import request from 'supertest'
+import logger from '../src/common/logger.util'
 import app from '../src/index'
 
 describe('Index', () => {
@@ -8,11 +9,15 @@ describe('Index', () => {
     beforeAll(async () => {
         const container: MongoDBContainer = new MongoDBContainer().withExposedPorts(27017)
         startedContainer = await container.start()
+        logger.info(
+            `[Index Test] MongoDB container started on ${startedContainer.getHost()}:${startedContainer.getMappedPort(27017)}`
+        )
         process.env.DB_URL = `mongodb://${startedContainer.getHost()}:${startedContainer.getMappedPort(27017)}/user-service`
     })
 
     afterAll(async () => {
         await startedContainer.stop()
+        logger.info(`[Index Test] MongoDB container stopped`)
     })
 
     describe('GET /', () => {

backend/user-service/src/common/logger.util.ts

@@ -0,0 +1,12 @@
+import Winston from 'winston'
+
+export default Winston.createLogger({
+    level: 'info',
+    format: Winston.format.json(),
+    defaultMeta: { service: 'user-service' },
+    transports: [
+        new Winston.transports.Console(),
+        new Winston.transports.File({ filename: 'error.log', level: 'error' }),
+        new Winston.transports.File({ filename: 'combined.log' }),
+    ],
+})

backend/user-service/src/index.ts

@@ -1,7 +1,7 @@
 import cors from 'cors'
 import express, { Express, NextFunction, Request, Response } from 'express'
 import helmet from 'helmet'
-import { logger } from './server'
+import logger from './common/logger.util'
 
 const app: Express = express()
 

backend/user-service/src/server.ts

@@ -1,21 +1,9 @@
 import 'dotenv/config'
 import http, { Server } from 'http'
 import { connect } from 'mongoose'
-import Winston, { Logger } from 'winston'
+import logger from './common/logger.util'
 import index from './index'
 
-// Setup Logger
-export const logger: Logger = Winston.createLogger({
-    level: 'info',
-    format: Winston.format.json(),
-    defaultMeta: { service: 'user-service' },
-    transports: [
-        new Winston.transports.Console(),
-        new Winston.transports.File({ filename: 'error.log', level: 'error' }),
-        new Winston.transports.File({ filename: 'combined.log' }),
-    ],
-})
-
 const port: string = process.env.PORT ?? '3000'
 const dbUrl: string | undefined = process.env.DB_URL
 if (!dbUrl) {