Terraform-provider-azurerm: EventGrid Subscriptions resource invalid topic name error

[jamesdj1991]

Hello,

When using the new azurerm_eventgrid_event_subscription resource manager to associate the new subscription resource to the topic, it throws an error as below:

* azurerm_eventgrid_event_subscription.sub: Error creating/updating EventGrid Event Subscription "sub" (Scope "/subscriptions/xxx-xxx-xxx-xxx-xxx/resourceGroups/sub-rg"): eventgrid.EventSubscriptionsClient#CreateOrUpdate: Failure sending request: StatusCode=400 -- Original Error: Code="InvalidRequest" Message="Invalid topic name."

Code being applied is below:

resource "azurerm_eventgrid_topic" "topic" {
name = "${var.short_location[0]}${var.environment__name}topic"
location = "${var.location[0]}"
resource_group_name = "${azurerm_resource_group.rg.*.name[0]}"
tags = "${local.default_tags}"

resource "azurerm_eventgrid_event_subscription" "sub" {
name = "${var.short_location[0]}${var.environment__name}-sub"
scope = "${azurerm_resource_group.rg.*.id[0]}"
event_delivery_schema = "EventGridSchema"
topic_name = "${azurerm_eventgrid_topic.topic.name}"
webhook_endpoint {
url = "blank"
}
}

I have tried replacing the topic_name = "${azurerm_eventgrid_topic.topic.name}" with topic_name = "${azurerm_eventgrid_topic.topic.id}" to try using the id of the resource instead. I have also attempted hard coding the topic name, to associate the subscription to the topic but it keeps showing the same error.

Any help would be much appreciated.

Thanks.

[wandrew26]

Run into the same issue, any news/ workarounds?

[jamesdj1991]

Hi @wandrew26, no fix for this as far as we know - we ended up moving away from event grid for now as the solution changed.

we did have a look at passing an arm template in to do it but decided against it:
https://docs.microsoft.com/en-us/azure/templates/microsoft.eventgrid/2019-01-01/eventsubscriptions

[wandrew26]

Started to develop a workaround with "local-exec" using azure cli. The following two warning came across:

• _"Argument 'resource_group_name' has been deprecated and will be removed in version '2.1.0'. Use '--source-resource-id' instead."_
• _"Argument 'topic_name' has been deprecated and will be removed in version '2.1.0'. Use '--source-resource-id' instead."_

Realized that the resource group in this case is an art from a topic type to subscribe and not a reference where to create the subscription resource.
It seems that "topic_name" and "resource_group_name" are deprecated parameters. Use "scope" instead with the id of the eventgrid topic.

resource "azurerm_eventgrid_event_subscription" "this" {
  name       = "${var.name}"
  scope      = "${azurerm_eventgrid_topic.this.id}"

  webhook_endpoint {
    url = "https://${var.functionapp_name}.azurewebsites.net/runtime/webhooks/eventgrid?functionName=${var.function_name}&code=${data.external.script.result["systemkey"]}"
  }
}

With this setup i was able to create the subscription between Function App and EventGrid Topic

Hope it helps!

[jamesdj1991]

Great thanks @wandrew26 we will take a look into it !

[chrisatrotter]

@wandrew26 Use "scope" instead with the id of the eventgrid topic worked great! Thank you!

[SteveDevOps]

@wandrew26 can I see example of how you're running output for systemkey in your external bash script?

[markti]

Started to develop a workaround with "local-exec" using azure cli. The following two warning came across:

• _"Argument 'resource_group_name' has been deprecated and will be removed in version '2.1.0'. Use '--source-resource-id' instead."_
• _"Argument 'topic_name' has been deprecated and will be removed in version '2.1.0'. Use '--source-resource-id' instead."_

Realized that the resource group in this case is an art from a topic type to subscribe and not a reference where to create the subscription resource.
It seems that "topic_name" and "resource_group_name" are deprecated parameters. Use "scope" instead with the id of the eventgrid topic.

resource "azurerm_eventgrid_event_subscription" "this" {
  name       = "${var.name}"
  scope      = "${azurerm_eventgrid_topic.this.id}"

  webhook_endpoint {
    url = "https://${var.functionapp_name}.azurewebsites.net/runtime/webhooks/eventgrid?functionName=${var.function_name}&code=${data.external.script.result["systemkey"]}"
  }
}

With this setup i was able to create the subscription between Function App and EventGrid Topic

Hope it helps!

Do you have the example posted somewhere?

[hashibot[bot]]

This has been released in version 2.21.0 of the provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading. As an example:

provider "azurerm" {
    version = "~> 2.21.0"
}
# ... other configuration ...

[hashibot[bot]]

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