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nodejs爬虫如何设置动态ip以及userAgent？

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nodejs爬虫如何设置动态ip以及userAgent

转https://blog.csdn.net/u014374031/article/details/78833765

前言

在写nodejs爬虫的过程中，原网站可能会对某一时间段内集中访问该页面的ip进行封杀。那么如何动态设置每次爬取使用的ip地址以及浏览器头部信息呢？

动态userAgent

这是我收集到的常用的浏览器头部信息，每次爬取的时候从中随机选取一个，并使用superAgent设置请求头部的User-Agent字段就好了。

userAgent.js

const userAgents = [
  \'Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.0.12) Gecko/20070731 Ubuntu/dapper-security Firefox/1.5.0.12\',
  \'Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0; Acoo Browser; SLCC1; .NET CLR 2.0.50727; Media Center PC 5.0; .NET CLR 3.0.04506)\',
  \'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/535.11 (KHTML, like Gecko) Chrome/17.0.963.56 Safari/535.11\',
  \'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_3) AppleWebKit/535.20 (KHTML, like Gecko) Chrome/19.0.1036.7 Safari/535.20\',
  \'Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.0.8) Gecko Fedora/1.9.0.8-1.fc10 Kazehakase/0.5.6\',
  \'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.1 (KHTML, like Gecko) Chrome/21.0.1180.71 Safari/537.1 LBBROWSER\',
  \'Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Win64; x64; Trident/5.0; .NET CLR 3.5.30729; .NET CLR 3.0.30729; .NET CLR 2.0.50727; Media Center PC 6.0) ,Lynx/2.8.5rel.1 libwww-FM/2.14 SSL-MM/1.4.1 GNUTLS/1.2.9\',
  \'Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)\',
  \'Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4.0E; QQBrowser/7.0.3698.400)\',
  \'Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; QQDownload 732; .NET4.0C; .NET4.0E)\',
  \'Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:2.0b13pre) Gecko/20110307 Firefox/4.0b13pre\',
  \'Opera/9.80 (Macintosh; Intel Mac OS X 10.6.8; U; fr) Presto/2.9.168 Version/11.52\',
  \'Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.0.12) Gecko/20070731 Ubuntu/dapper-security Firefox/1.5.0.12\',
  \'Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4.0E; LBBROWSER)\',
  \'Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.0.8) Gecko Fedora/1.9.0.8-1.fc10 Kazehakase/0.5.6\',
  \'Mozilla/5.0 (X11; U; Linux; en-US) AppleWebKit/527+ (KHTML, like Gecko, Safari/419.3) Arora/0.6\',
  \'Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4.0E; QQBrowser/7.0.3698.400)\',
  \'Opera/9.25 (Windows NT 5.1; U; en), Lynx/2.8.5rel.1 libwww-FM/2.14 SSL-MM/1.4.1 GNUTLS/1.2.9\',
  \'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.100 Safari/537.36\'
]

module.exports = userAgents

    app.js

    import request from \'superagent\'
import userAgents from \'../src/userAgent\'

async function doRequest(){
    let userAgent = userAgents[parseInt(Math.random() * userAgents.length)]
    request.get(\'http://www.xxx.com\')
    .set({ \'User-Agent\': userAgent })
    .timeout({ response: 5000, deadline: 60000 })
    .end(async(err, res) => {
      // 处理数据
    })
}

      动态ip

      设置动态IP需要用到一个superagent插件—superagent-proxy，除此之外为了避免每次爬取时都去获取一次动态IP的列表，我将爬取到的动态IP列表存放在redis中，并设置10分钟的过期时间。数据过期之后再重新发送获取动态IP的请求。

      ps: 这里我使用的动态IP是爬虫网络科技公司提供的免费代理，因为免费所以难免会有些缺陷。有时候使用他的代理ip并不能访问得通，我在后面会做单独的处理。

      package.json

      {
  "name": "xxx",
  "version": "1.0.0",
  "description": "xxx",
  "main": "arf.js",
  "scripts": {
    "arf": "nodemon src/app.js --exec babel-node --config package.json"
  },
  "keywords": [
    "爬虫"
  ],
  "author": "lidikang",
  "license": "MIT",
  "dependencies": {
    "bluebird": "^3.5.1",
    "cheerio": "^1.0.0-rc.2",
    "eventproxy": "^1.0.0",
    "mongoose": "^4.13.6",
    "mongoose-findorcreate": "^2.0.0",
    "progress": "^2.0.0",
    "redis": "^2.8.0",
    "superagent": "^3.8.1",
    "superagent-proxy": "^1.0.2"
  },
  "devDependencies": {
    "babel-cli": "^6.26.0",
    "babel-preset-es2015": "^6.24.1",
    "babel-preset-stage-2": "^6.24.1",
    "nodemon": "^1.12.4"
  },
  "nodemonConfig": {
    "ignore": [
      "ips.json",
      "docs/*"
    ],
    "delay": "2500"
  }
}

        app.js

        import request from \'superagent\'
import requestProxy from \'superagent-proxy\'
import redis from \'redis\'
// superagent添加使用代理ip的插件
requestProxy(request)
// redis promise化
bluebird.promisifyAll(redis.RedisClient.prototype)
bluebird.promisifyAll(redis.Multi.prototype)
// 建立mongoose和redis连接
const redisClient = connectRedis()

/**
 * 初始化redis
 */
function connectRedis() {
  let client = redis.createClient(config.REDIS_URL)
  client.on("ready", function(err) {
    console.log(\'redis连接 √\')
  })
  client.on("error", function(err) {
    console.log(`redis错误，${err}  ×`);
  })
  return client
}


/**
 * 请求免费代理，读取redis，如果代理信息已经过期，重新请求免费代理请求
 */
async function getProxyIp() {
  // 先从redis读取缓存ip
  let localIpStr = await redisClient.getAsync(\'proxy_ips\')
  let ips = null
  // 如果本地存在，则随机返回其中一个ip，否则重新请求
  if (localIpStr) {
    let localIps = localIpStr.split(\',\')
    return localIps[parseInt(Math.random() * localIps.length)]
  } else {
    let ipsJson = (await request.get(\'http://api.pcdaili.com/?order)).body
    let isRequestSuccess = false
    if (ipsJson && ipsJson.data.proxy_list) {
      ips = ipsJson.data.proxy_list
      isRequestSuccess = true
    } else {
      ips = [\'http://127.0.0.1\']
    }
    // 将爬取结果存入本地，缓存时间10分钟
    if (isRequestSuccess) {
      redisClient.set("proxy_ips", ips.join(\',\'), \'EX\', 10 * 60)
    }
    return ips[parseInt(Math.random() * ips.length)]
  }
}

async function doRequest(){
  let userAgent = userAgents[parseInt(Math.random() * userAgents.length)]
  let ip = await getProxyIp()
  let useIp = \'http://\' + ip
  request.get(\'http://www.xxx.com\')
    .set({ \'User-Agent\': userAgent })
    .timeout({ response: 5000, deadline: 60000 })
    .proxy(ip)
    .end(async(err, res) => {
      // 处理数据
    })
}

          之前说爬虫网络科技的免费ip有些缺陷—代理成功率有些低。这点必须想办法去修复，原理其实很简单，既然一次不成功那我就换个IP再试，直到成功了我才去开始执行解析html的逻辑

          async function doRequest(){
  let userAgent = userAgents[parseInt(Math.random() * userAgents.length)]
  let ip = await getProxyIp()
  let useIp = \'http://\' + ip
  request.get(\'http://www.xxx.com\')
    .set({ \'User-Agent\': userAgent })
    .timeout({ response: 5000, deadline: 60000 })
    .proxy(ip)
    .end(async(err, res) => {
      if (err) {
        console.log(`爬取页面失败，${err}，正在重新寻找代理ip... ×`)
        // 如果是代理ip无法访问，另外选择一个代理
        doRequest(\'http://\' + await getProxyIp(), userAgents[parseInt(Math.random() * userAgents.length)])
        return
      }
      // 解析html
      console.log(\'爬取页面  √\')
      await parseDivision(res.text)
    })
}

            如果你有啥疑问，欢迎写信到我的邮箱(andyliwr@outlook.com)与我讨论。

            原文请查看http://andyliwr.github.io/2017/12/05/nodejs_spider_ip/

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