如何运行后台云功能并计划数据库更改? [英] How to run a background Cloud Function and schedule a change in database?

问题描述

我正在使用React Native和Firebase Realtime数据库开发一个应用程序.我想做这样的事情.

I'm developing an app using React Native and Firebase Realtime database. I want to do something like this.

我从应用程序中设置了持续时间，然后按下一个按钮.然后，它将数据写入Firebase.假设我将持续时间设置为 1000000000 ms ，然后按下按钮.然后，数据库如下所示:

From the app, I set a time duration and press a button. Then, it writes data to the Firebase. Assume that I set the time duration to 1000000000 ms and press the button. Then, the database looks like this:

schedules
  |
  |--schedule1
       |
       |--status: "Running"
       |--durationInMS: 1000000000

我想运行一个后台功能，在 1000000000 ms 之后将上述状态更改为"TimeOver".即使关闭应用程序，该功能也应在后台运行:

I want to run a background function that changes the above status to "TimeOver" after 1000000000 ms. This function should be run in the background even if the app is closed:

schedules
      |
      |--schedule1
           |
           |--status: "TimeOver"
           |--durationInMS: 1000000000

该怎么做?

推荐答案

在数据库中写入一定的延迟后，没有内置触发器可以运行.

There is no built-in trigger to run after a certain delay that is written in the database.

但是您可以使用 Cloud Scheduler 构建自己的调度程序，也可以创建定期运行的<一个href ="https://firebase.google.com/docs/functions/schedule-functions" rel ="nofollow noreferrer">预定功能，然后检查数据库中已过期的预定.

But you can either build your own scheduler using Cloud Scheduler, or create a regularly running scheduled function that then checks for expired schedules in your database.

另请参阅:

• Firebase的云功能是否按时触发?
• 如何在firebase中以编程方式创建cron作业
• 按需n秒后执行云功能
• Firebase函数，在15分钟后运行用户不活动状态
• 计划的云功能Firebase
• 博客文章 Firebase中的动态计划后台作业

• Cloud Functions for Firebase trigger on time?
• How to create cron jobs in firebase programmatically
• Executing cloud functions after n seconds on demand
• Firebase Functions, run after 15 minutes of user inactivity
• How can we get Firestore to trigger an event when a document's Date/Time field matches current time?
• Scheduled Cloud Functions Firebase
• the blog post How to schedule a Cloud Function to run in the future with Cloud Tasks (to build a Firestore document TTL)
• the article Dynamic Scheduled Background Jobs in Firebase

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