如何在数据库中存储预定的cron引用，以便将来在节点js中停止该cron？

Question

我使用cron来安排推送通知。正在收集来自用户的消息推送数据和预定时间，以便在预定时间发送消息推送。

下面是我如何创建cron作业来安排推送通知：

const CronJob = require("cron").CronJob;
...
...
const schedulePushNotification = async (req, res) => {
  const job = new CronJob(
    new Date(req.body.scheduledTime),
    async () => {
      // my code to send push notification
      // code to store push notification data
      // Here I write a code to store push notification data to 
      // show on the dashboard like a list of notification
    },
    null,
    true,
    "America/Los_Angeles"
  );
  
  job.start();
  return res.status(200).json({
    success: true,
    message: "Notification has been scheduled successfully !",
    data: null,
  });
};

现在，要求是，如果用户想要取消预定的推送通知，他们可以单击cancel。

那么，我怎样才能摧毁正在运行的cron呢？

Answer 1

您可以通过在函数中添加if语句来实现这一点

您可以检查用户是否激活了通知，但首先，您必须在数据库中存储用户是否激活了通知，然后发送通知

Answer 2

您可以通过在函数中添加if语句来实现这一点

您可以检查用户是否激活了通知，但首先必须在数据库中存储用户是否激活了通知，然后发送通知

const CronJob = require("cron").CronJob;
...
...
const schedulePushNotification = async (req, res) => {
  const job = new CronJob(
    new Date(req.body.scheduledTime),
    async () => {



      let userNotificationDetails = getUserNotificationDetails();
      if(userNotificationDetails.isSendNotification){
          job.start();
      } else {
          // don't send notification
      }



      // my code to send push notification
      // code to store push notification data
      // Here I write a code to store push notification data to 
      // show on the dashboard like a list of notification
    },
    null,
    true,
    "America/Los_Angeles"
  );
  
  
  return res.status(200).json({
    success: true,
    message: "Notification has been scheduled successfully !",
    data: null,
  });
};

.

编辑（替代解决方案：在启动cron之前检查是否通知）：

const CronJob = require("cron").CronJob;
...
...
const schedulePushNotification = async (req, res) => {
  const job = new CronJob(
    new Date(req.body.scheduledTime),
    async () => {
      // my code to send push notification
      // code to store push notification data
      // Here I write a code to store push notification data to 
      // show on the dashboard like a list of notification
    },
    null,
    true,
    "America/Los_Angeles"
  );



  let userNotificationDetails = getUserNotificationDetails();
  if(userNotificationDetails.isSendNotification){
      job.start();
  } else {
      // don't send notification
  }
  



  return res.status(200).json({
    success: true,
    message: "Notification has been scheduled successfully !",
    data: null,
  });
};