用Node.JS写一个简单版的类似pm2\forever的守护进程并记录错误日志

const path = require('path');
const fs = require('fs');
const { spawn } = require('child_process');

class Thread {
 logDir = 'logs';
 restartInterval = 4000;

 __thread;

 addLog(type, data) {
   const date = (new Date()).toISOString();
   const msg = date + ' ' + data.toString();
   const logPath = path.join(this.logDir, date.substring(0, date.indexOf('T')) + '.' + type + '.log')

   console.log(msg);

   fs.appendFile(logPath, msg, () => { });
 }

 logMsg(data) { this.addLog('out', data) }
 logErr(data) { this.addLog('err', data) }

 init(cmd, args) {
   this.logMsg(`Start ${cmd} ${args}`);

   const thread = spawn(cmd, args);

   thread.stdout.on('data', data => this.logMsg(data));
   thread.stderr.on('data', data => this.logErr(data));

   thread.on('close', (code) => {
     this.logMsg(`Exited with code ${code}, will restart in ${this.restartInterval}`);
     setTimeout(()=>{
       this.init(cmd, args);
     }, this.restartInterval);
   });

   this.__thread = thread;
 }

 stop() {
   const __process = this.__thread;
   if (__process) {
     this.__thread = null;
     __process.kill();
   }
 }

 constructor(cmd, args) {
   fs.mkdir(this.logDir, err => {});
   this.init(cmd, args || []);
 }
}

const thread = new Thread('deploy.bat');