Invoke google cloud http function when message publish on a pub sub

Question

I have already written the code for google cloud http function however now I also wants to trigger the same function when the message published on pubsub.

So how do I invoke same cloud function from Http and ICloundEventFunction(fron pubsub)?

Answer 1

You can use a 2nd generation Cloud Function and create HTTP and PubSub triggers in one Cloud Function.

You can find details about it from this link: https://cloud.google.com/blog/products/serverless/cloud-functions-2nd-generation-now-generally-available

Answer 2

You can directly trigger a Cloud function on push mode with a Pub Sub topic:

https://cloud.google.com/functions/docs/calling/pubsub

This link explains well how to deploy a Cloud Function that listen a topic:

gcloud functions deploy YOUR_FUNCTION_NAME \
--trigger-topic=YOUR_PUBSUB_TOPIC \
[--retry] \
...

The cloud function is triggered when a message is published on the topic.

In Cloud Functions (2nd gen), Pub/Sub triggers are implemented as a particular type of Eventarc trigger.

https://cloud.google.com/functions/docs/calling/eventarc