NodeJS读取分析Nginx错误日志的方法

const readline = require('readline');
const fs = require('fs');
const path = require('path');
console.time('readline-time')
const rl = readline.createInterface({
 input: fs.createReadStream(path.join(__dirname, '../public/api.err.log'), {
  start: 0,
  end: Infinity
 }),

});
let count = 0; 
rl.on('line', (line) => {
 const arr = line.split(', ');
 const time = arr[0].split('')[0].split('[')[0].replace(/\//g, '-');//获取到时间
 const error = arr[0].split('')[1].split(/\d\s/)[1];//错误原因
 const client = arr[1].split(' ')[1];//请求的客户端
 const server = arr[2].split(' ')[1];//请求的网址
 const url = arr[3].match(/\s\/(\S)\s/)[0].trim()//获取请求链接
 const upstream = arr[4].match(/(?<=").?(?=")/g)[0];//获取上游
 const host = arr[5].match(/(?<=").?(?=")/g)[0];//获取host
 const referrer = arr[6] ? arr[6].match(/(?<=").?(?=")/g)[0] : '';//来源
 console.log(`时间:${time}-原因:${error}-客户端:${client}-网址:${server}-地址:${url}-上游:${upstream}-主机:${host}-来源:${referrer}`); 
 count++;
});
rl.on('close', () => {
 let size = fs.statSync(path.join(__dirname, '../public/api.err.log')).size;
 console.log(`读取完毕:${count};文件位置:${size % 2 === 0}`);
 console.timeEnd('readline-time')
});

rl.on('close', async () => {
     let count = 0;
     for (let i of rlist) {
      count++;
      if (count % 500 === 0) {
       const res = await global.db.collection('logs').bulkWrite(rlist.slice(count, count + 500), { ordered: false, w: 1 }).catch(err => { console.error(`批量插入出错${err}`) }); 
      } else if (count === rlist.length - 1) {
      //批量插入 数据
       const res = await global.db.collection('logs').bulkWrite(rlist.slice(rlist - (rlist % 500), rlist.length), { ordered: false, w: 1 });
       let size = fs.statSync(addres).size;
       size = size % 2 === 0 ? size : size + 1;//保证字节大小是偶数 不然会出现读取上行内容不完整的情况
       count = 0;
       rlist.length = [];
       //更新数据库里面文件的size
       global.db.collection('tasks').updateOne({ _id: addre }, { $set: { _id: addre, size, date: +new Date() } }, { upsert: true }); 
      }
     }
     resolve(true);
    })

if (typeof s === 'string' && s) {
     var lines = s.split(/\r\n|\n|\r/);
     for (var i = 0, len = lines.length; i < len; i++) {
      if (i > 0) {
       this._line();
      }
      this._insertString(lines[i]);
     }
    }
...
Interface.prototype._line = function() {
 const line = this._addHistory();
 this.clearLine();
 this._onLine(line);
};
...
Interface.prototype._onLine = function(line) {
 if (this._questionCallback) {
  var cb = this._questionCallback;
  this._questionCallback = null;
  this.setPrompt(this._oldPrompt);
  cb(line);
 } else {
  this.emit('line', line);
 }
};

db.logs.aggregate(
 // Pipeline
 [
 // Stage 1
 {
  $group: {
   '_id': { 'client': '114.112.163.28', 'server': '$server', 'error': '$error', 'url': '$url', 'upstream': '$upstream','date':'$date' ,'msg':'$msg' } ,
     
   'date':{'$addToSet':'$date'},
   count: { '$sum': 1 } 
  }
 },
 // Stage 2
 {
  $match: { 
     count: { $gte: 1 },
     date: ['2019-05-10']
    
  }
 },
 {
  $sort: {
    count: -1
  }
 },
 ],
 // Options
 {
 cursor: {
  batchSize: 50
 },
 allowDiskUse: true
 }
);