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The AWS Cloud Development Kit (CDK) is a popular tool for defining infrastructure as code (IaC) using familiar programming languages. One powerful feature of the CDK is the ability to define custom resources, which allow you to extend the capabilities of the CDK and integrate with other services and APIs.

In this post, we’ll explore the CDK custom resource provider framework, which makes it easy to create and manage custom resources in your CDK applications.

What are custom resources?

Custom resources are pieces of CloudFormation infrastructure that are created, updated, or deleted by an AWS Lambda function. You can use custom resources to perform tasks that are not directly supported by CloudFormation, such as interacting with third-party APIs or triggering other AWS services.

The custom resource provider framework

The CDK custom resource provider framework provides a simple, standardized way to implement and manage custom resources in your CDK applications. It includes the following components:

• The CustomResourceProvider class, which defines the interface for creating and managing custom resources.
• The CustomResource class, which represents a custom resource in your CDK application.
• The CustomResourceProviderProps interface, which defines the properties that are passed to the CustomResourceProvider class when creating a custom resource.

To use the custom resource provider framework, you need to create a class that implements the CustomResourceProvider interface and register it with the CDK. Then, you can use the CustomResource class to create custom resources in your CDK application.

Here’s an example of how to create a custom resource provider and use it to create a custom resource:

from aws_cdk import core
from aws_cdk.custom_resources import CustomResource, CustomResourceProvider

class MyCustomProvider(CustomResourceProvider):
    def create(self, props: "CustomResourceProps") -> "CustomResource":
        # implement create logic
        pass
    
    def update(self, old_props: "CustomResourceProps", new_props: "CustomResourceProps") -> "CustomResource":
        # implement update logic
        pass
    
    def delete(self, props: "CustomResourceProps") -> None:
        # implement delete logic
        pass

app = core.App()
stack = core.Stack(app, "MyStack")

provider = MyCustomProvider(stack, "MyProvider")

custom_resource = CustomResource(stack, "MyCustomResource", provider=provider, properties={"foo": "bar"})

With the custom resource provider framework, you can easily create and manage custom resources in your CDK applications, and take advantage of the full power of the CDK.

Conclusion

In this post, we’ve introduced the AWS CDK custom resource provider framework and shown how to use it to create and manage custom resources in your CDK applications. With the custom resource provider framework, you can easily extend the capabilities of the CDK and integrate with other services and APIs.