本篇文章将在上篇文章stream演示基础上,完成对网络请求日志的存储。
封装日志写入工具类。
utils/log.js
const fs = require('fs')
const path = require('path')
const http = require('http')
// 写入日志
function writeLog (writeStream, log) {
writeStream.write(log+'\n')
}
// 创建写入stream
function createWriteStream (fileName) {
// 要存储日志的目录
const fullFileName = path.join(__dirname,'../','../','logs',fileName)
const writeStream = fs.createWriteStream(fullFileName, {
flags:'a' // a:追加到问价末尾;w:已覆盖方式写入文件
})
return writeStream
}
// 得到access.log的文件写入流
const writeStream = createWriteStream('access.log')
// 对外暴露的访问,存储请求日志
function access (log) {
writeLog(writeStream,log)
}
module.exports = {
access
}
然后在app.js
入口,在每次请求接口时调用工具方法,写入每次访问接口信息。
const {access} = require('./src/utils/log')
const log = `${req.method} -- ${req.url} -- ${req.headers['user-agent']} -- ${Date.now()}`
access(log)