Bindings on Dapr Docs

Bindings overview

Mon, 01 Jan 0001 00:00:00 +0000

Using Dapr’s bindings API, you can trigger your app with events coming in from external systems and interface with external systems. With the bindings API, you can:

Avoid the complexities of connecting to and polling from messaging systems, such as queues and message buses.
Focus on business logic, instead of the implementation details of interacting with a system.
Keep your code free from SDKs or libraries.
Handle retries and failure recovery.
Switch between bindings at runtime.
Build portable applications with environment-specific bindings set-up and no required code changes.

For example, with bindings, your application can respond to incoming Twilio/SMS messages without:

How-To: Trigger your application with input bindings

Mon, 01 Jan 0001 00:00:00 +0000

With input bindings, you can trigger your application when an event from an external resource occurs. An external resource could be a queue, messaging pipeline, cloud-service, filesystem, etc. An optional payload and metadata may be sent with the request.

Input bindings are ideal for event-driven processing, data pipelines, or generally reacting to events and performing further processing. Dapr input bindings allow you to:

Receive events without including specific SDKs or libraries
Replace bindings without changing your code
Focus on business logic and not the event resource implementation

This guide uses a Kafka binding as an example. You can find your preferred binding spec from the list of bindings components. In this guide:

How-To: Use output bindings to interface with external resources

Mon, 01 Jan 0001 00:00:00 +0000

With output bindings, you can invoke external resources. An optional payload and metadata can be sent with the invocation request.

This guide uses a Kafka binding as an example. You can find your preferred binding spec from the list of bindings components. In this guide:

The example invokes the /binding endpoint with checkout, the name of the binding to invoke.
The payload goes inside the mandatory data field, and can be any JSON serializable value.
The operation field tells the binding what action it needs to take. For example, the Kafka binding supports the create operation.
- You can check which operations (specific to each component) are supported for every output binding.

Note

If you haven’t already, try out the bindings quickstart for a quick walk-through on how to use the bindings API.

Create a binding

Create a binding.yaml file and save to a components sub-folder in your application directory.