triggers.md

Azure Functions Dapr triggers

Azure Functions can be triggered using the following Dapr events.

There are no templates for triggers in Dapr in the functions tooling today. Start your project with another trigger type (e.g. Storage Queues) and then modify the function.json or attributes.

Input Binding Trigger

Trigger on a Dapr input binding.

Function.json sample

{
    "type": "daprBindingTrigger",
    "bindingName": "myKafkaBinding",
    "name": "triggerData",
    "direction": "in"
}

C# Attribute sample

[DaprBindingTrigger(BindingName = "myKafkaBinding")] JObject triggerData,

Properties

Property Name	Description
BindingName	The name of the Dapr trigger. If not specified, the name of the function is used as the trigger name.

Service Invocation Trigger

Trigger on a Dapr service invocation.

Function.json sample

{
    "type": "daprServiceInvocationTrigger",
    "name": "triggerData",
    "direction": "in"
}

C# Attribute sample

[DaprServiceInvocationTrigger] JObject triggerData,

Properties

Property Name	Description
MethodName	Optional. The name of the method the Dapr caller should use. If not specified, the name of the function is used as the method name.

Topic Trigger

Trigger on a Dapr topic subscription. The trigger will automatically expose and endpoint and communicate with the Dapr sidecar which topics it is interested in receiving data for based on trigger configuration.

Function.json sample

{
    "type": "daprTopicTrigger",
    "pubsubname": "pubsub",
    "topic": "myTopic",
    "name": "triggerData",
    "direction": "in"
}

C# Attribute sample

[DaprTopicTrigger("pubsub", Topic = "myTopic")] CloudEvent triggerData,

Properties

Property Name	Description
PubSubName	The name of the Dapr pub/sub.
Topic	The name of the Dapr topic.