azure function via terraform: how to connect to service bus - azure

Question

I am stuck when trying to deploy an Azure function via Azure DevOps pipelines and Terraform.
Running terraform apply works fine and the Service Bus looks good and works. In the Azure portal the function seems to be running, but it complains that it can not find the ServiceBusConnection.
I defined it via the following Terraform declaration:
resource "azurerm_resource_group" "rg" {
name = "rg-sb-westeurope"
location = "westeurope"
}
resource "azurerm_servicebus_namespace" "sb" {
name = "ns-sb"
location = azurerm_resource_group.rg.location
resource_group_name = azurerm_resource_group.rg.name
sku = "Standard"
}
resource "azurerm_servicebus_queue" "sbq" {
name = "servicebusqueue"
resource_group_name = azurerm_resource_group.rg.name
namespace_name = azurerm_servicebus_namespace.sb.name
enable_partitioning = true
}
resource "azurerm_servicebus_namespace_authorization_rule" "sb-ar" {
name = "servicebus_auth_rule"
namespace_name = azurerm_servicebus_namespace.sb.name
resource_group_name = azurerm_resource_group.rg.name
listen = false
send = true
manage = false
}
In the function app i declare:
resource "azurerm_function_app" "fa" {
name = "function-app"
location = azurerm_resource_group.rg.location
resource_group_name = azurerm_resource_group.rg.name
app_service_plan_id = azurerm_app_service_plan.asp.id
storage_account_name = azurerm_storage_account.sa.name
storage_account_access_key = azurerm_storage_account.sa.primary_access_key
app_settings = {
ServiceBusConnection = azurerm_servicebus_namespace_authorization_rule.sb-ar.name
}
}
This tf. will not work out of the box as i have not copied here the full declaration.
I think I am setting the connection environment vars wrong but have no idea on how to do it correctly.
EDIT
With the hint from #Heye I got it working. This is the correct snipped replacing the name with primary_connection_string.
resource "azurerm_function_app" "fa" {
name = "function-app"
location = azurerm_resource_group.rg.location
resource_group_name = azurerm_resource_group.rg.name
app_service_plan_id = azurerm_app_service_plan.asp.id
storage_account_name = azurerm_storage_account.sa.name
storage_account_access_key = azurerm_storage_account.sa.primary_access_key
app_settings = {
ServiceBusConnection = azurerm_servicebus_namespace_authorization_rule.sb-ar.primary_connection_string
}
}

Answer 1

You are setting the ServiceBusConnection value to the name of the authorization rule. However, you probably want to set it to the primary_connection_string, as that contains the key along with all the information needed to connect to the Service Bus.