azurerm_eventgrid_event_subscription binding to eventgrid topic endpoint missing

[dharmesh019]

Is there an existing issue for this?

• [X] I have searched the existing issues

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Terraform Version

v1.1.7

AzureRM Provider Version

3.0.0

Affected Resource(s)/Data Source(s)

azurerm_eventgrid_event_subscription

Terraform Configuration Files

eventgrid_endpoint_id is missing as input to bind to eventgrid topic.

Debug Output/Panic Output

eventgrid_endpoint_id is missing as input to bind to eventgrid topic.

Expected Behaviour

it should allow to bind eventgrid_endpoint_id to event subscription but it has only eventhub_endpoint_id to bind with and eventgrid topic binding is missing.

Actual Behaviour

it does not allow to have binding with eventgrid topic endpoint to recieve the events from eventgrid.

Steps to Reproduce

No response

Important Factoids

No response

References

No response

[xiaxyi]

@dharmesh019 are you suggesting to send the events back to event grid by using the event grid topic id in event grid subscription ?

[xiaxyi]

@dharmesh019 I don't see event_grid is supported as an endpoint in rest api.

The supported endpoints are:

EventSubscriptionDestination: WebHookEventSubscriptionDestination EventHubEventSubscriptionDestination StorageQueueEventSubscriptionDestination HybridConnectionEventSubscriptionDestination ServiceBusQueueEventSubscriptionDestination ServiceBusTopicEventSubscriptionDestination AzureFunctionEventSubscriptionDestination PartnerEventSubscriptionDestination

Can you be more specific about your requirement?

[kratkyzobak]

Got here from googling as name/documentation of azurerm_eventgrid_event_subscription can be confusing for anyone starting with eventgrid in terraform (valid for me). It seems, author of this issue ment bind as filter to specific topic. For anyone who came searching for "How to filter azurerm_eventgrid_event_subscription to topic or domain" - use scope field.

[jephlu]

I tested the azurerm_eventgrid_event_subscription, it creates 2 Azure ressources :

• 1 Event Grid System topic (name inherited from resource group name + an id)
• 1 Event grid Event Subscription attached to the Event Grid System topic. The name is the one declared in the resources.

Also, these 2 resources can be deployed by these tf ressources

• azurerm_eventgrid_system_topic
• azurerm_eventgrid_system_topic_event_subscription

This naming is really better to understand.

So, the azurerm_eventgrid_event_subscription seems to be useless... and cannot be used to link to an eventgrid topic.

I Join @dharmesh019 on this need, regarding the others resources :

• azurerm_eventgrid_topic => creates an Event Grid Topic
• azurerm_eventgrid_domain => creates an Event Grid domain
• azurerm_eventgrid_domain_topic => creates an EG Topic in a domain.

So, you can build the publishing part for a topic / domain / domain topic, but there is no tf ressource to create the subscribers for theses. You have a half Azure ressource, not totally functional.

It could be by adding the following tf resources to the provider :

• azurerm_eventgrid_topic_event_subscription
• azurerm_eventgrid_domain_event_subscription
• azurerm_eventgrid_domain_topic_event_subscription

Let me know @xiaxyi if it helps to the need !

[kratkyzobak]

You can subscribe to domain/domain topic/topic using azurerm_eventgrid_event_subscription.

Just pass domain/domain topic/topic id into scope field of azurerm_eventgrid_event_subscription

[jephlu]

Ok, i misunderstood this parameter ! In the documentation , the scope parameter uses a resource group, and in this case it creates on top of the event subscription an EG system topic. It misled me... I think it was to scope azure resource group / subscription / management group. I tested with scopes on domain/domain topic/topic and yes it works... But seems not with an existing System topic (the other resource azurerm_eventgrid_system_topic_event_subscription can manage it) Thanks for the info 👍 Maybe it could be good to improve doc on this parameter to better explain it ;)