节点服务器重新启动后运行Cron作业（挥发性，可恢复性，持久性） [英] Run Cron Jobs after the Node server restarts (volatility, recoverability, durability)

问题描述

我使用了NPM中的 cron 库。

我想为用户创建事件，创建预期在事件发生后一个月内执行的作业。

让我们说这是我的代码：

  function userSignedUpEvent（user）{
 var today = new Date（）; 
 today.setDate（today.getDate（）+ 30）; 
 
 let cronSignature =`$ {today.getMinutes（）} $ {today.getHours（）} $ {today.getDate（）} $ {today.getMonth（）} *`
 let reminderJob = new CronJob（cronSignature，
（）=> {
 user.sendEmail（已经加入我们一个月了！）; 
}，null，true， 亚洲/耶路撒冷）; 
} 
  

问题是如果服务器在确切的时间关闭cron-signature，代码永远不会被执行。

我的情况下有没有办法保存这些作业，并在服务器重新启动时再次签名？ / p>

理论上，我可以将自己的签名保存在我的数据库中，并由我自己实现，但是我想确保没有一个驱动的方法来实现。 >

解决方案

所以我在这个项目中实现了这个：
crone-durable

I use the cron library in NPM.

I want to make events for users, that create jobs that are expected to be executed in a month after the event.

Let's say that this is my code:

function userSignedUpEvent(user) {
  var today = new Date();
  today.setDate(today.getDate() + 30);

  let cronSignature = `${today.getMinutes()} ${today.getHours()} ${today.getDate()} ${today.getMonth()} *`
  let reminderJob = new CronJob(cronSignature,
    () => {
      user.sendEmail("It has been a month since you joined us!");
    }, null, true, "Asia/Jerusalem");
}

The problem is that if the server is shut-down at the exact time of the cron-signature, the code will never be executed.

Is there a way in my case to save these jobs and sign them again whenever the server is up again?

Theoretically, I can save their signatures in my Database and implement that by myself, but I want to be sure there isn't a driven method to do it.

解决方案

So I've implemented this in this project: crone-durability

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