Azure Event Grid

Azure Event Grid is a fully-managed event routing service in Microsoft Azure that enables developers to build event-driven applications. It simplifies the development of event-based applications by providing a scalable and reliable way to consume and react to events from various sources.

With Azure Event Grid, you can easily connect various Azure services, such as Azure Storage, Azure Functions, and Azure Logic Apps, to react to events in real-time. You can also use custom event publishers to send events to Event Grid.


How Azure Event Grid Works

1. Event Sources Identified that publish events to a Topic in Azure Event Grid. Event sources can be various Azure services or custom webhooks.

2. Create a Topic using the Azure portal, Azure CLI or Azure PowerShell and get the topic endpoint URL that will be used to publish events to the topic.

2. Azure Event Grid uses topic subscriptions to route events to their intended endpoints. Subscribers can be various Azure services such as Azure Functions, Logic Apps, Event Hubs, or custom HTTP endpoints. 

3. Filters can be applied to a subscription to specify which events should be delivered to that subscription. Filters can be based on event types, event content, or both.

4. Publish events to the topic by sending an HTTP(S) POST request to the topic endpoint with the event payload in the request body. You can use various programming languages, such as C#, Java, Python, or Node.js, to publish events to Azure Event Grid.

5. When an event is published to Azure Event Grid, the service evaluates the filters associated with each subscription to determine which subscribers should receive the event.

6. Azure Event Grid delivers the event to the specified endpoint (subscriber), which can then perform actions based on the event, such as processing data or triggering other workflows.

7. Monitor the delivery of events using Azure Event Grid metrics and logs, which provide insights into event delivery, subscription status, and more.

8. Azure Event Grid also provides features such as retry policies and dead-lettering to ensure reliable delivery of events.


How to subscribe events in Azure Event Grid?

Steps to subscribe to events in Azure Event Grid are 

1. Identify the event source that generates the events to be subscribed. This could be an Azure service, custom code, or a third-party application.

2. Create a subscription to the event source using the Azure portal, Azure CLI, or Azure and specify the event types and the filters that you want to apply to the events.

3. Specify the subscriber endpoint url that could be an Azure Function, a Logic App, a webhook, Azure Event Hubs, Azure Service Bus or a third-party application to receive the events.

4. Configure filters to specify which events should be delivered to the subscriber based on event type, data, or subject. You can specify multiple filters for a subscription.

5. Once you have specified the subscriber endpoint and configured the filters, you can save the subscription. The subscription will start receiving events that match the specified filters from the event source.

5. Finally, you can monitor the delivery of events using Azure Event Grid metrics and logs. The metrics and logs provide insights into event delivery, subscription status, and more, allowing you to troubleshoot any issues that may arise.

By following these steps, you can easily subscribe to events in Azure Event Grid and create reactive and scalable applications that react to events in real-time.


Types of Events in Azure Event Grid

Azure Event Grid can handle various types of events that includes

Azure subscription-level events 

These are events that occur at the Azure subscription level, such as changes to resource groups, resource providers, or Azure AD.


Azure resource-level events 

These are events that occur at the resource level, such as changes to Azure Storage accounts, Azure Virtual Machines, or Azure App Services.


Custom events 

These are custom events that you can define and publish to Azure Event Grid using custom event publishers.


Third-party events 

These are events that can be consumed from third-party services, such as GitHub, Azure DevOps, or Stripe.


Azure Event Grid supports a wide range of event publishers and subscribers, making it a versatile and scalable solution for building event-driven applications. Additionally, Event Grid provides features such as filtering, routing, and delivery guarantees to ensure that events are delivered reliably to the right subscribers.


Azure Event Grid Use Cases

Azure Event Grid is a powerful eventing service that can be used for a wide range of use cases. Some common use cases for Azure Event Grid are


Serverless computing 

Azure Event Grid can be used to trigger Azure Functions, Logic Apps, or other serverless computing resources based on events. This enables developers to create reactive and scalable serverless applications that can react to events in real-time.


IoT telemetry 

Azure Event Grid can be used to process and analyze telemetry data from IoT devices. For example, a temperature sensor can send events to Azure Event Grid, which can trigger an Azure Function to perform real-time analytics on the data.


File processing 

Azure Event Grid can be used to monitor file systems and trigger actions based on file changes. For example, an event can be triggered when a file is added or deleted, which can then trigger an Azure Function to perform file processing tasks.


Event-driven architectures 

Azure Event Grid can be used to create event-driven architectures, where services and applications communicate through events. This enables developers to create decoupled and scalable architectures that are responsive to changing conditions.


Hybrid cloud scenarios 

Azure Event Grid can be used to connect on-premises systems to the cloud, enabling events to be generated and consumed across hybrid environments.


DevOps automation 

Azure Event Grid can be used to trigger DevOps automation workflows, such as deployments and testing, based on events generated by source control systems, build systems, or other DevOps tools.


These are just a few examples of the many use cases for Azure Event Grid. With its scalable and reliable eventing capabilities, Azure Event Grid can be used to build reactive and event-driven applications that are highly responsive to changing conditions.


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