chore: added Winston

src/server/server.ts

@@ -4,6 +4,7 @@ import express, { Request, Response } from 'express';
 import helmet from 'helmet';
 import { Validator } from 'jsonschema';
 import { addition } from '../utils/addition';
+import { logger } from '../utils/logger';
 
 const server = express();
 server.use(cors());
@@ -22,6 +23,7 @@ const schema = {
 };
 
 server.post('/', (req: Request, res: Response) => {
+  logger.info(`POST / with ${JSON.stringify(req.body)}`);
   if (!validator.validate(req.body, schema).valid) {
     return res.status(400).json({ message: 'Malformed query parameters' });
   }

src/utils/addition.ts

@@ -1,8 +1,11 @@
+import { logger } from './logger';
+
 /**
  * Format a response message containing a user input.
  * @param number - The user input value.
  * @returns The value increased by one.
  */
 export function addition(value: number) {
+  logger.info(`addition(${value})`);
   return value + 1;
 }

src/utils/logger.ts

@@ -0,0 +1,21 @@
+import winston from 'winston';
+import 'winston-daily-rotate-file';
+const { combine, timestamp, printf, align } = winston.format;
+
+const fileRotateTransport = new winston.transports.DailyRotateFile({
+  filename: 'logs/winston.log',
+  datePattern: 'YYYY-MM-DD',
+  maxFiles: '7d'
+});
+
+export const logger = winston.createLogger({
+  level: 'info',
+  format: combine(
+    timestamp({
+      format: 'YYYY-MM-DD hh:mm:ss.SSS A'
+    }),
+    align(),
+    printf((info) => `${info.timestamp} - ${info.level}: ${info.message}`)
+  ),
+  transports: [fileRotateTransport]
+});