Cloud Function triggered by PubSub topic in another project

[Joshua Fox]

I would like my My Cloud  Function in Project A to be triggered by PubSub topic from Project B.

I specify the topic with --trigger-topic mytopic in deployment but I would like somehow  to specify that mytopic is in project-b.

Outside Cloud Functions, I know how to access PubSub cross-project, for example in Python with  publisher_client.create_topic('projects/project-b/topics/mytopic') (and  loading appropriate Google Application Credentials).

How do I access a  cross-project topic from Cloud Functions?

[Ali At Tayeb]

Hi,

As per the Cloud Functions Pub/Sub trigger documentation, the function can only be triggered by messages published to a topic in the same GCP project as the function. 

There is an open feature request to have this functionality added to Cloud Functions. You can also find a workaround using an HTTP-function described in this StackOverflow answer. 

[Kir Titievsky]

You can't today. Sorry.  We are working to make this possible within a couple months.  You could solve this for now by having a relay layer: your producers might read from project-specific topics and republish all the data all to a single topic in a single project.

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Kir Titievsky | Product Manager | Google Cloud Pub/Sub 

[Eric Park]

Hi,

Is there an update on this? We're looking to create a Cloud Function with a Pub/Sub topic in a separate project. 

Please advise!

Thank you,

Eric Park

[dikaur]

Hello Erik,

The functionality to create Cloud Function with a Pub/Sub topic in a separate project is not yet available. You can see the feature request [1], in which several workarounds are also included that might be useful for your environment. Any updates regarding the feature request will also be posted under the same PIT [1]. Please be sure to star [2] the issue to receive notification on any updates. 

[1] https://issuetracker.google.com/62373846

[2] https://developers.google.com/issue-tracker/guides/subscribe#starring_an_issue

[Kir Titievsky]

Eric, I'm trying to track down the right people in cloud functions to see if we can give you a view as to when this might happen. 

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