fix for issue 13568 - event_grid_extension_config_key is null

internal/services/web/function_app_host_keys_data_source.go

@@ -49,6 +49,12 @@ func dataSourceFunctionAppHostKeys() *pluginsdk.Resource {
 				Sensitive: true,
 			},
 
+			"event_grid_extension_key": {
+				Type:      pluginsdk.TypeString,
+				Computed:  true,
+				Sensitive: true,
+			},
+
 			"signalr_extension_key": {
 				Type:      pluginsdk.TypeString,
 				Computed:  true,
@@ -112,9 +118,15 @@ func dataSourceFunctionAppHostKeysRead(d *pluginsdk.ResourceData, meta interface
 		}
 		d.Set("default_function_key", defaultFunctionKey)
 
+		// The name of the EventGrid System Key has changed from version 1.x to version 2.x:
+		// https://learn.microsoft.com/en-us/azure/azure-functions/event-grid-how-tos?tabs=v2%2Cportal#system-key
+		// This block accommodates both keys.
 		eventGridExtensionConfigKey := ""
-		if v, ok := res.SystemKeys["eventgridextensionconfig_extension"]; ok {
-			eventGridExtensionConfigKey = *v
+		for _, key := range []string{"eventgridextensionconfig_extension", "eventgrid_extension"} {
+			if v, ok := res.SystemKeys[key]; ok {
+				eventGridExtensionConfigKey = *v
+				break
+			}
 		}
 		d.Set("event_grid_extension_config_key", eventGridExtensionConfigKey)
 

internal/services/web/function_app_host_keys_data_source_test.go

@@ -39,3 +39,87 @@ data "azurerm_function_app_host_keys" "test" {
 }
 `, template)
 }
+
+func TestAccFunctionAppHostKeysDataSource_linuxEventGridTrigger(t *testing.T) {
+	data := acceptance.BuildTestData(t, "data.azurerm_function_app_host_keys", "test")
+
+	data.DataSourceTest(t, []acceptance.TestStep{
+		{
+			Config: FunctionAppHostKeysDataSource{}.linuxEventGridTrigger(data),
+			Check: acceptance.ComposeTestCheckFunc(
+				check.That(data.ResourceName).Key("primary_key").Exists(),
+				check.That(data.ResourceName).Key("default_function_key").Exists(),
+				check.That(data.ResourceName).Key("event_grid_extension_config_key").Exists(),
+			),
+		},
+	})
+}
+
+func (d FunctionAppHostKeysDataSource) linuxEventGridTrigger(data acceptance.TestData) string {
+	return fmt.Sprintf(`
+provider "azurerm" {
+  features {}
+}
+
+resource "azurerm_resource_group" "test" {
+  name     = "acctestRG-%[1]d"
+  location = "%[2]s"
+}
+
+resource "azurerm_storage_account" "test" {
+  name                     = "acctestsa%[3]s"
+  resource_group_name      = azurerm_resource_group.test.name
+  location                 = azurerm_resource_group.test.location
+  account_tier             = "Standard"
+  account_replication_type = "LRS"
+}
+
+resource "azurerm_service_plan" "test" {
+  name                = "acctestASP-%[1]d"
+  location            = azurerm_resource_group.test.location
+  resource_group_name = azurerm_resource_group.test.name
+
+  os_type  = "Linux"
+  sku_name = "EP1"
+}
+
+resource "azurerm_linux_function_app" "test" {
+  name                       = "acctest-%[1]d-func"
+  location                   = azurerm_resource_group.test.location
+  resource_group_name        = azurerm_resource_group.test.name
+  service_plan_id            = azurerm_service_plan.test.id
+  storage_account_name       = azurerm_storage_account.test.name
+  storage_account_access_key = azurerm_storage_account.test.primary_access_key
+
+  zip_deploy_file = abspath("testdata/test_trigger.zip")
+
+  app_settings = {
+    WEBSITE_RUN_FROM_PACKAGE = 1
+  }
+
+  identity {
+    type = "SystemAssigned"
+  }
+
+  site_config {
+    application_stack {
+      python_version = "3.11"
+    }
+  }
+}
+
+// The key is not always present when azurerm_linux_function_app.test creation completes.
+resource "time_sleep" "wait_for_event_grid_key" {
+  depends_on = [azurerm_linux_function_app.test]
+
+  create_duration = "30s"
+}
+
+data "azurerm_function_app_host_keys" "test" {
+  depends_on = [time_sleep.wait_for_event_grid_key]
+
+  name                = azurerm_linux_function_app.test.name
+  resource_group_name = azurerm_linux_function_app.test.resource_group_name
+}
+`, data.RandomInteger, data.Locations.Primary, data.RandomString)
+}