Triggering Cloud Run with Pub/Sub

The code for the render service can be found at this GitHub repo:

https://github.com/ACloudGuru-Resources/content-google-cloudrun-deepdive-render

Note: Before you create the container, you will need to create a Cloud Storage bucket to hold rendered images. Then, you will need to update the code of the render service with the name of your bucket (line 35 of function.py).

Build the container and push it to Google Container Registry, replacing <YOUR_PROJECT> with your project ID:

gcloud builds submit --tag gcr.io/<YOUR_PROJECT>/render .

The deployed service should not allow unauthenticated invocations.

1. Create a service account with the Cloud Run Invoker role.
2. Create a Cloud Pub/Sub topic.
3. Create a subscription for the topic:
   • The subscription should be Push.
   • It should use the endpoint of the render service.
   • It should use the service account you just created.

Note: When you enable authentication for the Push subscription, Pub/Sub will prompt you to add the iam.serviceAccountTokenCreator role and then reset the Add subscription form. This appears to be a normal (if somewhat quirky) behavior of the Cloud Console. Just re-enter the information to create the subscription, and it will work.

1. Publish some test messages to your Pub/Sub topic.
2. View the rendered images in the Cloud Storage bucket.

Images may take a minute or two to render before you can see them in the bucket. If you have any problems, check the logs of your Cloud Run service.