GCP - Verify ownership of a cloud function https endpoint for a PubSub push

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Pretty sure there's no way to do this but would be great to reach out to see if anyone else has any ideas.

What I'm trying to do is this:

  • I have 2 microservices hosted on Google Cloud Platform as cloud functions
  • My first microservices does stuff and fires a PubSub message with topic [x]
  • I'd like to set my second microservice up as a push subscriber to the topic [x]. I know I can do this by deploying the 2nd cloud function with a subscription trigger but I don't want to do this as there's no decent way to acknowledge/reject the message (see this post: Google Cloud Functions to only Ack Pub/Sub on success).
  • Therefore I've deployed my 2nd function as having a HTTP trigger. I've then tried to configure the push subscription in the GCP console to this endpoint URL. Of course, this isn't working because the https://[cloud-subdomain].cloudfunctions.net/ isn't a verified domain.

I guess it's just not possible to do what I'm trying to and instead need to create my 2nd microservice in app engine or elsewhere where i can verify a domain.

Thanks in advance!

google-cloud-pubsub google-cloud-functions google-cloud-platform
2 Answers

I published a detailed description of how to send messages from a pubsub topic in project A to a cloud function in project B. Including push endpoint configuration, domain verification and a python code example. This can be found in the following stackoverflow post:

Google pubsub into HTTP triggered cloud function?

user_79505920
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