Event Grid for event-driven architecture in Azure - Mini Project: Build & Apply

Event Grid for event-driven architecture

📖 Scenario: You are building a simple event-driven system on Azure. You want to create an Event Grid topic to send events and a subscription to receive those events. This will help your application react to changes in real time, like new files uploaded or messages sent.

🎯 Goal: Create an Azure Event Grid topic and an event subscription using Azure Resource Manager (ARM) template syntax. This will set up the infrastructure to send and receive events.

📋 What You'll Learn

Create an Event Grid topic named myEventGridTopic

Create an Event Grid event subscription named myEventSubscription

Subscribe myEventSubscription to myEventGridTopic

Use valid ARM template JSON structure

💡 Why This Matters

🌍 Real World

Event Grid is used to build reactive, event-driven applications that respond to changes instantly, such as processing uploaded files or triggering workflows.

💼 Career

Understanding Event Grid and ARM templates is essential for cloud engineers and architects working with Azure to automate infrastructure and build scalable event-driven systems.

1

Create the Event Grid topic resource

Create an ARM template resource for an Event Grid topic named myEventGridTopic with type Microsoft.EventGrid/topics and API version 2023-06-01. Set the location to eastus.

Azure

{
  "resources": [
    {
      // Your Event Grid topic resource here
    }
  ]
}

Need a hint?

Use the resources array to define the Event Grid topic resource with the exact name and location.

2

Add the Event Grid event subscription resource

Add an ARM template resource for an Event Grid event subscription named myEventSubscription with type Microsoft.EventGrid/topics/eventSubscriptions and API version 2023-06-01. Set the scope to the Event Grid topic myEventGridTopic and set the destination endpoint URL to https://example.com/api/events.

Azure

{
  "resources": [
    {
      "type": "Microsoft.EventGrid/topics",
      "apiVersion": "2023-06-01",
      "name": "myEventGridTopic",
      "location": "eastus",
      "properties": {}
    },
    {
      // Your Event Grid event subscription resource here
    }
  ]
}

Need a hint?

Use the combined name format topicName/subscriptionName for the event subscription resource name.

3

Add a filter to the event subscription

In the event subscription resource, add a filter property to only receive events where the subject begins with /blobServices/default/containers/images/.

Azure

{
  "resources": [
    {
      "type": "Microsoft.EventGrid/topics",
      "apiVersion": "2023-06-01",
      "name": "myEventGridTopic",
      "location": "eastus",
      "properties": {}
    },
    {
      "type": "Microsoft.EventGrid/topics/eventSubscriptions",
      "apiVersion": "2023-06-01",
      "name": "myEventGridTopic/myEventSubscription",
      "properties": {
        "destination": {
          "endpointType": "WebHook",
          "properties": {
            "endpointUrl": "https://example.com/api/events"
          }
        },
        "filter": {
          // Add subjectBeginsWith filter here
        }
      }
    }
  ]
}

Need a hint?

Add the subjectBeginsWith property inside the filter object.

4

Add tags to the Event Grid topic

Add a tags property to the Event Grid topic resource with the key environment and value production.

Azure

{
  "resources": [
    {
      "type": "Microsoft.EventGrid/topics",
      "apiVersion": "2023-06-01",
      "name": "myEventGridTopic",
      "location": "eastus",
      "properties": {},
      // Add tags property here
    },
    {
      "type": "Microsoft.EventGrid/topics/eventSubscriptions",
      "apiVersion": "2023-06-01",
      "name": "myEventGridTopic/myEventSubscription",
      "properties": {
        "destination": {
          "endpointType": "WebHook",
          "properties": {
            "endpointUrl": "https://example.com/api/events"
          }
        },
        "filter": {
          "subjectBeginsWith": "/blobServices/default/containers/images/"
        }
      }
    }
  ]
}

Need a hint?

Add the tags property at the same level as properties in the Event Grid topic resource.