在设定的时间后仅运行一次cron作业 [英] Run a cron job only once after a set time
问题描述
我只需要运行一次cron作业即可在设置的时间间隔后执行一次特定的云功能，但是有点不确定该怎么做.有什么办法可以通过当前的Google云平台来做到这一点?
I need to run a cron job to perform a specific cloud function after a set interval only once but a bit unsure of how to do it. Is there any way to do this through the current google cloud platform?
推荐答案
在下面的讨论中通过注释进行更新:
Update following our discussion below through comments:
如果您要在创建后2小时内更改Firestore数据库中的文档"，可以执行以下操作:
If you want to "change a document in your Firestore database 2 hours after it has been created" you could do as follows:
- 在Firestore中创建文档时，请保存创建日期/时间，例如与
firebase.firestore.FieldValue.serverTimestamp() - 具有如下所述的定期调用的HTTP Cloud Function(每分钟?每5分钟?)，并且首先选择2小时前创建的文档(基于保存的时间戳)，然后执行所需的操作对这些文档采取行动.
如果要通过cron作业触发Cloud Function，请注意，通常可以通过HTTP Cloud Function通过cron作业调用Cloud Function URL来实现.
If you want to trigger a Cloud Function through a cron job, note that you would normally do that through an HTTP Cloud Function, calling the Cloud Function URL via the cron job.
您可以使用 cron-job.org 之类的外部服务，也可以使用GCP的App Engine和Cloud Pub/Sub
You can either use an external service like cron-job.org or you can use GCP's App Engine and Cloud Pub/Sub
观看此视频: https://www.youtube.com/watch?v=fEBPAMSk5_8
和此博客文章: https://firebase.googleblog.com/2017/03/how-to-schedule-cron-jobs-with-cloud.html
均来自Firebase团队.
both from the Firebase team.
最后请注意，最近GCP发布了新产品 Cloud Scheduler ，该产品可用于调用HTTP Cloud Functions.
Finally note that recently GCP launched a new product, Cloud Scheduler, which can be used to call HTTP Cloud Functions.
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