add logger and daily rotating log files

lib/utils.js

@@ -1,4 +1,7 @@
 const dayjs = require('dayjs')
+const winston = require('winston')
+require('winston-daily-rotate-file')
+const path = require('path')
 
 const checkValidURL = (url) => {
   return checkURLFormat(url) ||
@@ -52,6 +55,35 @@ const getNormalizedUrl = (URLparameter) => {
   return mobileUrl
 }
 
+const createDailyRotateLogFileTransport = () => {
+  const transport =  new (winston.transports.DailyRotateFile)({
+    filename: path.join(__dirname, '..', 'logs', 'app-%DATE%.log'),
+    datePattern: 'YYYY-MM-DD-HH',
+    zippedArchive: false,
+    maxSize: '20m',
+    maxFiles: '14d',
+  })
+
+  return transport
+}
+
+const createTransports = (dev) => {
+  return [
+    dev && new winston.transports.Console(),
+    createDailyRotateLogFileTransport(),
+  ].filter(transport => transport)
+}
+
+const createAppLogger = ({ dev }) => {
+  return winston.createLogger({
+    transports: createTransports(dev),
+    format: winston.format.combine(
+      winston.format.colorize(),
+      winston.format.json()
+    ),
+  })
+}
+
 module.exports = {
   checkValidURL,
   checkURLFormat,
@@ -60,4 +92,6 @@ module.exports = {
   createMobileURL,
   createURL,
   getNormalizedUrl,
+  createAppLogger,
+  createTransports,
 }