Add data source for pubsub topics

[hahomdal]

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Description

We're creating some pubsub topics by using gke config connector(https://cloud.google.com/config-connector/docs/overview). This allows us to apply applications and their dependencies through kubernetes manifests.

Some solutions which aren't running in GKE, however, are managed through terraform. One usecase is to create a subscription to an existing topic for a legacy application.

There doesn't, however, seem to be any data sources for pubsub topics or the other pubsub resources either.

I would like a data source that permits creating a subscription to a topic which isn't managed by terraform. Once at it, it might be a good idea to create data sources for the other pubsub resources as well.

Defining the topic both in config connector and as a resource in terraform doesn't seem like a good idea, since one should probably keep the two in sync in order to avoid conflicts.

New or Affected Resource(s)

Potential Terraform Configuration

New or Affected Resource(s)

• google_pubsub_topic
• google_pubsub_subscription

Potential Terraform Configuration

data "google_pubsub_topic" "topic_foo" {
  project = "1_project"
  name = "foo_events"
}

resource "google_pubsub_subscription" "subscription_foo_events" {
  project = "2_project"
  name = "foo_events"
  topic  = data.google_pubsub_topic.topic_foo
  ...
}

References

[ghost]

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