azurerm_function_app should wait for function deployment

[sschmeck]

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Description

When you define a azurerm_function_app with a fixed function artifact using app_settings.WEBSITE_RUN_FROM_PACKAGE, sometimes the apply fails. Since the azurerm_function_app creation finished before the artifact is deployed successfully, subsequent resources like azurerm_eventgrid_event_subscription fail.

Error: Error waiting for EventGrid Event Subscription "example" (Scope "/subscriptions/ae79848e-00d9-4ec8-bf5a-0f9768bb3d3a/resourceGroups/07245d2fhir/providers/Microsoft.EventGrid/topics/example") to become available: Code="Endpoint validation" Message="Destination azure endpoint not found. Resource details: resourceId: /subscriptions/.../resourceGroups/example/providers/Microsoft.Web/sites/example/functions/example. Resource should pre-exist before attempting this operation. Activity id:09a829bc-a0dc-4545-8085-6b3f69cac2aa, timestamp: 7/24/2020 1:24:11 PM (UTC)."
  on ../../infrastructure/functions.tf line 48, in resource "azurerm_eventgrid_event_subscription" "example":
  48: resource "azurerm_eventgrid_event_subscription" "example" {

Therefore the azurerm_function_app should check for a deployment and wait until it has finished.

New or Affected Resource(s)

• azurerm_function_app

References

• #0000

[jonathanmedd]

We have the same problem. Need to create multiple event subscriptions in different Azure subscriptions utilising the same Azure function in a function app in it's own subscription. They get created simultaneously, some are successfully deployed by terraform and some fail with the same error above.

To workaround it for now we use a time_sleep resource for a couple of mins to give sufficient time for the functions in the function app to become available after being deployed from blob storage via the WEBSITE_RUN_FROM_PACKAGE app setting.

Not ideal, but it's OK until this issue gets resolved.

[vagharshakus]

if somebody is still struggling with this issue, because of f.e. long-runnung local-exec, deploying function code, here a workaround: https://registry.terraform.io/providers/hashicorp/time/latest/docs/resources/sleep

[vmille]

Hi,
sorry, but even with the sleep, no luck. Do you know if there is another workaround ?
No issue if I create the subscription by the portal.

Thank you !