var end = res.end;
res.end = function(chunk, encoding) {
 res.responseTime = (new Date) - req._startTime;
 res.end = end;
 res.end(chunk, encoding);
 ...
 }

import winston from 'winston'
import expressWinston from 'express-winston'
import 'winston-daily-rotate-file'
import path from 'path'

export let DailyRotateFileTransport = (fileName) => {
 return new (winston.transports.DailyRotateFile)({
 filename: path.join(process.env.LOGPATH, `${fileName}-%DATE%.log`),
 datePattern: 'YYYY-MM-DD-HH',
 // maxSize: '20m',
 maxFiles: '7d',
 timestamp: () => new Date().format('yyyy-MM-dd hh:mm:ss.S')
 })
}

export let pageRequestLogger = expressWinston.logger({
 transports: [
 DailyRotateFileTransport('page-request')
 ],
 meta: true, // optional: control whether you want to log the meta data about the request (default to true)
 msg: 'HTTP {{req.method}} {{req.url}}', // optional: customize the default logging message. E.g. "{{res.statusCode}} {{req.method}} {{res.responseTime}}ms {{req.url}}"
 expressFormat: true, // Use the default Express/morgan request formatting. Enabling this will override any msg if true. Will only output colors with colorize set to true
 colorize: false, // Color the text and status code, using the Express/morgan color palette (text: gray, status: default green, 3XX cyan, 4XX yellow, 5XX red).
 ignoreRoute: function (req, res) {
 // 只打印頁面請求信息
 let notPageRequest = false
 let ignoreArr = ['/api', '.js', '.css', '.png', '.jpg', '.gif']
 ignoreArr.forEach(item => {
 if (req.url.indexOf(item) > -1) notPageRequest = true
 })
 return notPageRequest
 } // optional: allows to skip some log messages based on request and/or response
})

export let apiRequestLogger = (req, res, next) => {
 let send = res.send
 let content = ''
 let query = req.query || {}
 let body = req.body || {}
 res.send = function () {
 content = arguments[0]
 send.apply(res, arguments)
 }
 expressWinston.logger({
 transports: [
 DailyRotateFileTransport('api-request')
 ],
 meta: true, // optional: control whether you want to log the meta data about the request (default to true)
 msg () {
 return `HTTP ${req.method} ${req.url} query ${JSON.stringify(query)} body ${JSON.stringify(body)} resData ${content} `
 },
 colorize: true, // Color the text and status code, using the Express/morgan color palette (text: gray, status: default green, 3XX cyan, 4XX yellow, 5XX red).
 ignoreRoute: function (req, res) {
 if (req.headers.self) return true
 return false
 } // optional: allows to skip some log messages based on request and/or response
 })(req, res, next)
}