Node.js 实现 HTTP 访问日志

越来越咸，两个月没发文章了，刚刚换项目了，开始学一些新的知识。
近来调试 webhook 和 http callback 比较多，想要使用 Node.js 写一个接收所有 HTTP 请求，并把请求头和请求体写进log，返回 200 OK 的 service。

其实就是简单的 access.log 啦。
其实就是刚学习 Node.js 写的 demo 啦。
啊这是很简单你不要拆穿啦。

这是输出的 log 的样子，优化了可读性，时间、method、path、URL参数（Query）、请求头（Header）、请求体（Body）都详细记录了：

info: 2019-07-25 18:04:36
    POST /v1.0/standard
    Query:
        search: keyword
    Header:
        cache-control: no-cache
        postman-token: f4103067-4b07-447d-9fab-f09a75b6ddda
        content-type: application/json
        user-agent: PostmanRuntime/3.0.11-hotfix.2
        accept: */*
        host: localhost:4000
        accept-encoding: gzip, deflate
        content-length: 209
        connection: keep-alive
    Body:
        appId: XXX
        data:
            userId: 123
            requestId: 456
        timestamp: 0

依赖配置：

| 包 | 作用 |
| - | - | - |
| body-parser | 转换form表单、json等格式的请求体 |
| express | 启http服务 |
| moment | 时间格式化 |
| winston | 打log |

package.json

{
  "name": "httplog",
  "version": "1.0.0",
  "description": "Log all http request to the service",
  "main": "app.js",
  "author": "iMaeGoo",
  "license": "MIT",
  "dependencies": {
    "body-parser": "^1.19.0",
    "express": "^4.17.1",
    "moment": "^2.24.0",
    "winston": "^3.2.1"
  }
}

app.js

const express = require('express')
const bodyParser = require('body-parser')
const winston = require('winston')
const moment = require('moment')
const app = express()
const port = 4000
const logger = winston.createLogger({
    level: 'info',
    format: winston.format.simple(),
    transports: [
        new winston.transports.File({ filename: 'http.log' }),
        new winston.transports.Console()
    ]
});

app.use(bodyParser.json({
    type: 'application/json'
}))
app.use(bodyParser.urlencoded({
    type: 'application/x-www-form-urlencoded'
}))
app.use(bodyParser.text({
    type: '*/*'
}))
app.get('*', reqHandler)
app.post('*', reqHandler)
app.put('*', reqHandler)
app.delete('*', reqHandler)
app.listen(port, () => console.log(`listening & logging on port ${port}`))

function reqHandler(req, res) {
    logger.info(formatReq(req))
    res.send('OK')
}

function formatReq(req) {
    let logStr = getStandardDateTime()
    logStr += `\n\t${req.method} ${req.path}`
    logStr += `\n\tQuery:`
    logStr += `${toString(req.query, 2)}`
    logStr += `\n\tHeader:`
    logStr += `${toString(req.headers, 2)}`
    if (req.method !== 'GET') {
        logStr += `\n\tBody:`
        if (req.body instanceof Object) {
            logStr += `${toString(req.body, 2)}`
        } else {
            logStr += `\n\t\t${req.body}`
        }
    }
    return logStr
}

function getStandardDateTime(date) {
    return moment(date).format('YYYY-MM-DD HH:mm:ss')
}

function toString(obj, tabCount = 2) {
    let str = ''
    let item
    for (let key in obj) {
        item = obj[key]
        str += '\n'
        for (let i = 0; i < tabCount; i++) {
            str += '\t'
        }
        str += `${key}:`
        if (item instanceof Object) {
            str += toString(item, tabCount + 1)
        } else {
            str += ` ${item}`
        }
    }
    return str
}

之后安装依赖，运行：

npm install
node app.js

Spring Boot 也可以很简单实现，谁来写一下？