Azure Event Hubs binding spec

Detailed documentation on the Azure Event Hubs binding component

Component format

To setup Azure Event Hubs binding create a component of type bindings.azure.eventhubs. See this guide on how to create and apply a binding configuration.

See this for instructions on how to set up an Event Hub.

apiVersion: dapr.io/v1alpha1
kind: Component
metadata:
  name: <NAME>
spec:
  type: bindings.azure.eventhubs
  version: v1
  metadata:
  - name: connectionString      # Azure EventHubs connection string
    value: "Endpoint=sb://****"
  - name: consumerGroup         # EventHubs consumer group
    value: "group1"
  - name: storageAccountName    # Azure Storage Account Name
    value: "accountName"
  - name: storageAccountKey     # Azure Storage Account Key
    value: "accountKey"
  - name: storageContainerName  # Azure Storage Container Name
    value: "containerName"
  - name: partitionID           # (Optional) PartitionID to send and receive events
    value: 0

Spec metadata fields

Field Required Binding support Details Example
connectionString Y Output The EventHubs connection string. Note that this is the EventHub itself and not the EventHubs namespace. Make sure to use the child EventHub shared access policy connection string "Endpoint=sb://****"
consumerGroup Y Output The name of an EventHubs Consumer Group to listen on "group1"
storageAccountName Y Output The name of the account of the Azure Storage account to persist checkpoints data on "accountName"
storageAccountKey Y* Output The account key for the Azure Storage account to persist checkpoints data on. *Not required if using AAD authentication. "accountKey"
storageContainerName Y Output The name of the container in the Azure Storage account to persist checkpoints data on "containerName"
partitionID N Output ID of the partition to send and receive events 0
eventHub N Output The name of the EventHubs hub. Required if using AAD authentication. eventHubsNamespace-hubName
eventHubNamespace N Output The name of the EventHubs namespace. Required if using AAD authentication. eventHubsNamespace

Azure Active Directory (AAD) authentication

The Azure Event Hubs pubsub component supports authentication using all Azure Active Directory mechanisms. For further information and the relevant component metadata fields to provide depending on the choice of AAD authentication mechanism, see the docs for authenticating to Azure.

Binding support

This component supports output binding with the following operations:

  • create

Input Binding to Azure IoT Hub Events

Azure IoT Hub provides an endpoint that is compatible with Event Hubs, so Dapr apps can create input bindings to read Azure IoT Hub events using the Event Hubs bindings component.

The device-to-cloud events created by Azure IoT Hub devices will contain additional IoT Hub System Properties, and the Azure Event Hubs binding for Dapr will return the following as part of the response metadata:

System Property Name Description & Routing Query Keyword
iothub-connection-auth-generation-id The connectionDeviceGenerationId of the device that sent the message. See IoT Hub device identity properties.
iothub-connection-auth-method The connectionAuthMethod used to authenticate the device that sent the message.
iothub-connection-device-id The deviceId of the device that sent the message. See IoT Hub device identity properties.
iothub-connection-module-id The moduleId of the device that sent the message. See IoT Hub device identity properties.
iothub-enqueuedtime The enqueuedTime in RFC3339 format that the device-to-cloud message was received by IoT Hub.
message-id The user-settable AMQP messageId.

For example, the headers of a HTTP Read() response would contain:

{
  'user-agent': 'fasthttp',
  'host': '127.0.0.1:3000',
  'content-type': 'application/json',
  'content-length': '120',
  'iothub-connection-device-id': 'my-test-device',
  'iothub-connection-auth-generation-id': '637618061680407492',
  'iothub-connection-auth-method': '{"scope":"module","type":"sas","issuer":"iothub","acceptingIpFilterRule":null}',
  'iothub-connection-module-id': 'my-test-module-a',
  'iothub-enqueuedtime': '2021-07-13T22:08:09Z',
  'message-id': 'my-custom-message-id',
  'x-opt-sequence-number': '35',
  'x-opt-enqueued-time': '2021-07-13T22:08:09Z',
  'x-opt-offset': '21560',
  'traceparent': '00-4655608164bc48b985b42d39865f3834-ed6cf3697c86e7bd-01'
}