Event handlers in Azure Event Grid

• 01/21/2019
• 5 minutes to read
• • 
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An event handler is the place where the event is sent. The handler takes some further action to process the event. Several Azure services are automatically configured to handle events. You can also use any WebHook for handling events. The WebHook doesn't need to be hosted in Azure to handle events. Event Grid only supports HTTPS WebHook endpoints.

This article provides links to content for each event handler.

Azure Automation

Use Azure Automation to process events with automated runbooks.

Azure Functions

Use Azure Functions for serverless response to events.

When using Azure Functions as the handler, use the Event Grid trigger instead of generic HTTP triggers. Event Grid automatically validates Event Grid Function triggers. With generic HTTP triggers, you must implement the validation response.

Event Hubs

Use Event Hubs when your solution gets events faster than it can process the events. Your application processes the events from Event Hubs at it own schedule. You can scale your event processing to handle the incoming events.

Event Hubs can act as either an event source or event handler. The following article shows how to use Event Hubs as a handler.

For examples of Event Hubs as a source, see Event Hubs source.

Hybrid Connections

Use Azure Relay Hybrid Connections to send events to applications that are within an enterprise network and don't have a publicly accessible endpoint.

Logic Apps

Use Logic Apps to automate business processes for responding to events.

Service Bus Queue (Preview)

Use Service Bus as an event handler to route your events in Event Grid directly to Service Bus queues for use in buffering or command and control scenarios in enterprise applications. The preview does not work with Service Bus Topics and Sessions, but it does work with all tiers of Service Bus queues.

Please note, while Service Bus as a handler is in public preview, you must install the CLI or PowerShell extension when using those to create event subscriptions.

Install extension for Azure CLI

For Azure CLI, you need the Event Grid extension.

In CloudShell:

• If you've installed the extension previously, update it with az extension update -n eventgrid.
• If you haven't installed the extension previously, install it by using az extension add -n eventgrid.

For a local installation:

1. Install the Azure CLI. Make sure that you have the latest version, by checking with az --version.
2. Uninstall previous versions of the extension with az extension remove -n eventgrid.
3. Install the eventgrid extension with az extension add -n eventgrid.

Install module for PowerShell

For PowerShell, you need the AzureRM.EventGrid module.

In CloudShell:

• Install the module with Install-Module -Name AzureRM.EventGrid -AllowPrerelease -Force -Repository PSGallery.

For a local installation:

1. Open PowerShell console as administrator.
2. Install the module with Install-Module -Name AzureRM.EventGrid -AllowPrerelease -Force -Repository PSGallery.

If the -AllowPrerelease parameter isn't available, use the following steps:

1. Run Install-Module PowerShellGet -Force.
2. Run Update-Module PowerShellGet.
3. Close the PowerShell console.
4. Restart PowerShell as administrator.
5. Install the module Install-Module -Name AzureRM.EventGrid -AllowPrerelease -Force -Repository PSGallery.

Using CLI to add a Service Bus handler

For Azure CLI, the following example subscribes and connects an Event Grid topic to a Service Bus queue:

# If you haven't already installed the extension, do it now.
# This extension is required for preview features.
az extension add --name eventgrid

az eventgrid event-subscription create \
    --name <my-event-subscription> \
    --source-resource-id /subscriptions/{SubID}/resourceGroups/{RG}/providers/Microsoft.EventGrid/topics/topic1 \
    --endpoint-type servicebusqueue \
    --endpoint /subscriptions/{SubID}/resourceGroups/TestRG/providers/Microsoft.ServiceBus/namespaces/ns1/queues/queue1

Queue Storage

Use Queue storage to receive events that need to be pulled. You might use Queue storage when you have a long running process that takes too long to respond. By sending events to Queue storage, the app can pull and process events on its own schedule.

WebHooks

Use webhooks for customizable endpoints that respond to events.

Next steps

• For an introduction to Event Grid, see About Event Grid.
• To quickly get started using Event Grid, see Create and route custom events with Azure Event Grid.