Deploy functions from ARM, before create event subscription - azure

Question

Using ARM I created a function APP and an event grid topic.
Now, from the same ARM, I want to create a subscription to the topic, but to do it, I need to deploy functions into the function App before.
Is it possible to deploy my functions from the same ARM? Or Do I must to have two different ARMs, one to create all stuff (storage and topics) except functions related and another one the create all resources that need the functions deployed (event subscriptions)? In the second case, I will need to deploy functions in the middle.
I'm looking for one ARM to deploy the full infrastructure from zero (including functions in the function app). Is this possible? How?

Answer 1

According to my test, we can create these resources in one template. For example
{
"$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json",
"contentVersion": "1.0.0.0",
"parameters": {
"eventGridTopicName": {
"type": "string",
"defaultValue": "EventGridTopic",
"metadata": {
"description": "The name of the Event Grid custom topic."
}
},
"eventGridSubscriptionName": {
"type": "string",
"defaultValue": "EventGridSub",
"metadata": {
"description": "The name of the Event Grid custom topic's subscription."
}
},
"location": {
"type": "string",
"defaultValue": "[resourceGroup().location]",
"metadata": {
"description": "The location in which the Event Grid resources should be deployed."
}
},
"appName": {
"type": "string",
"defaultValue": "Func",
"metadata": {
"description": "The name of the function app that you wish to create."
}
},
"functionName": {
"type": "string",
"defaultValue": "EventGridFunction",
"metadata": {
"description": "Function App Name"
}
},
"storageAccountType": {
"type": "string",
"defaultValue": "Standard_LRS",
"allowedValues": [
"Standard_LRS",
"Standard_GRS",
"Standard_RAGRS"
],
"metadata": {
"description": "Storage Account type"
}
},
"runtime": {
"type": "string",
"defaultValue": "dotnet",
"allowedValues": [
"node",
"dotnet",
"java"
],
"metadata": {
"description": "The language worker runtime to load in the function app."
}
}
},
"variables": {
"eventGridTopic": "[concat(uniquestring(resourceGroup().id),parameters('EventGridTopicName'))]",
"eventGridSub": "[concat(uniquestring(resourceGroup().id),parameters('eventGridSubscriptionName'))]",
"functionUrl": "[concat('https://', variables('FunctionAppName'),'.azurewebsites.net/runtime/webhooks/eventgrid?functionName=', parameters('FunctionName'),'&code=')]",
"functionAppName": "[concat(uniquestring(resourceGroup().id),parameters('appName'))]",
"hostingPlanName": "[parameters('appName')]",
"applicationInsightsName": "[parameters('appName')]",
"storageAccountName": "[concat(uniquestring(resourceGroup().id), 'azfunction')]",
"functionWorkerRuntime": "[parameters('runtime')]"
},
"resources": [
// create event topic
{
"name": "[variables('eventGridTopic')]",
"type": "Microsoft.EventGrid/topics",
"location": "[parameters('location')]",
"apiVersion": "2020-04-01-preview",
},
// create event topic subscrition
{
"name": "[concat(variables('eventGridTopic'), '/Microsoft.EventGrid/', variables('eventGridSub'))]",
"type": "Microsoft.EventGrid/topics/providers/eventSubscriptions",
"location": "[parameters('location')]",
"apiVersion": "2020-04-01-preview",
"dependsOn": [
"[variables('eventGridTopic')]",
"[resourceId('Microsoft.Web/sites/functions/', variables('functionAppName'), parameters('functionName'))]"
],
"properties": {
"destination": {
"endpointType": "AzureFunction",
"properties": {
"resourceId": "[resourceId('Microsoft.Web/sites/functions/', variables('functionAppName'), parameters('functionName'))]"
}
},
"filter": {
}
}
},
// create storage account
{
"type": "Microsoft.Storage/storageAccounts",
"name": "[variables('storageAccountName')]",
"apiVersion": "2016-12-01",
"location": "[parameters('location')]",
"kind": "Storage",
"sku": {
"name": "[parameters('storageAccountType')]"
}
},
// create host plan
{
"type": "Microsoft.Web/serverfarms",
"apiVersion": "2018-02-01",
"name": "[variables('hostingPlanName')]",
"location": "[parameters('location')]",
"sku": {
"name": "Y1",
"tier": "Dynamic"
},
"properties": {
"name": "[variables('hostingPlanName')]",
"computeMode": "Dynamic"
}
},
// create function app
{
"apiVersion": "2015-08-01",
"type": "Microsoft.Web/sites",
"name": "[variables('functionAppName')]",
"location": "[parameters('location')]",
"kind": "functionapp",
"dependsOn": [
"[resourceId('Microsoft.Web/serverfarms', variables('hostingPlanName'))]",
"[resourceId('Microsoft.Storage/storageAccounts', variables('storageAccountName'))]",
"[concat('microsoft.insights/components/', variables('applicationInsightsName'))]"
],
"properties": {
"serverFarmId": "[resourceId('Microsoft.Web/serverfarms', variables('hostingPlanName'))]",
"siteConfig": {
"appSettings": [
{
"name": "AzureWebJobsStorage",
"value": "[concat('DefaultEndpointsProtocol=https;AccountName=', variables('storageAccountName'), ';AccountKey=', listKeys(resourceId('Microsoft.Storage/storageAccounts', variables('storageAccountName')),'2015-05-01-preview').key1)]"
},
{
"name": "WEBSITE_CONTENTAZUREFILECONNECTIONSTRING",
"value": "[concat('DefaultEndpointsProtocol=https;AccountName=', variables('storageAccountName'), ';AccountKey=', listKeys(resourceId('Microsoft.Storage/storageAccounts', variables('storageAccountName')),'2015-05-01-preview').key1)]"
},
{
"name": "WEBSITE_CONTENTSHARE",
"value": "[toLower(variables('functionAppName'))]"
},
{
"name": "FUNCTIONS_EXTENSION_VERSION",
"value": "~3"
},
{
"name": "APPINSIGHTS_INSTRUMENTATIONKEY",
"value": "[reference(resourceId('microsoft.insights/components/', variables('applicationInsightsName')), '2015-05-01').InstrumentationKey]"
},
{
"name": "FUNCTIONS_WORKER_RUNTIME",
"value": "[variables('functionWorkerRuntime')]"
}
]
}
}
},
// create event gride trigger function
{
"apiVersion": "2019-08-01",
"name": "[concat(variables('functionAppName'),'/', parameters('functionName'))]",
"type": "Microsoft.Web/sites/functions",
"dependsOn":[ "[variables('functionAppName')]"],
"properties": {
"config": {
"bindings": [
{
"name": "eventGridEvent",
"direction": "in",
"type": "eventGridTrigger"
}
]
},
"files":{
// the code
"run.csx":"#r \"Microsoft.Azure.EventGrid\"\r\nusing Microsoft.Azure.EventGrid.Models;\r\n\r\npublic static void Run(EventGridEvent eventGridEvent, ILogger log)\r\n{\r\n log.LogInformation(eventGridEvent.Data.ToString());\r\n}"
}
}
},
// create application insight
{
"apiVersion": "2018-05-01-preview",
"name": "[variables('applicationInsightsName')]",
"type": "microsoft.insights/components",
"location": "East US",
"tags": {
"[concat('hidden-link:', resourceGroup().id, '/providers/Microsoft.Web/sites/', variables('applicationInsightsName'))]": "Resource"
},
"properties": {
"ApplicationId": "[variables('applicationInsightsName')]",
"Request_Source": "IbizaWebAppExtensionCreate"
}
}
],
"outputs": {
}
}
For more details, please refer to the blog.