1. Real-Time Data Processing Endpoints with AWS API Gateway


    Real-time data processing often requires setting up API endpoints that can handle requests and responses at a high velocity and low latency. AWS API Gateway is a service that allows you to create, publish, maintain, monitor, and secure APIs at any scale. It is fully managed, making it easy to create API endpoints that connect to various backends, such as AWS Lambda functions, which can be used for real-time data processing.

    When you set up endpoints in AWS API Gateway, there are several components involved:

    1. API Gateway REST API: This acts as the "front door" for applications to access data, business logic, or functionality from your backend services.

    2. Resources and Methods: An API Gateway REST API is made up of resources and HTTP methods, which can be configured to interact with different backend services.

    3. Integrations: This defines how the methods interact with backend endpoints, such as a Lambda function or HTTP URL. You can transform and pass data between the client and backend with integrations.

    4. Authorizers: Optionally, you may want to control access to your API with authorization, such as using Cognito User Pools or a Lambda function to evaluate the caller's identity.

    5. Stages and Deployments: To make an API available to users, it must be deployed to a "stage" which is a logical reference to a lifecycle state, such as beta or prod.

    Here's a Pulumi program written in Python that sets up a simple REST API Gateway in AWS. The API Gateway will have one resource (/data) and one POST method that invokes a Lambda function for data processing.

    import pulumi import pulumi_aws as aws # Create an AWS Lambda function for processing the data data_processor = aws.lambda_.Function("dataProcessor", runtime="python3.7", code=pulumi.AssetArchive({ ".": pulumi.FileArchive("./data_processor"), # Your Lambda function source code folder or file }), handler="handler.lambda_handler", role=some_role.arn, # An AWS IAM Role that the Lambda function assumes for permission to execute ) # Create an AWS API Gateway REST API api = aws.apigateway.RestApi("api", description="API for real-time data processing", ) # Create a resource under the API for data processing data_resource = aws.apigateway.Resource("dataResource", rest_api=api.id, path_part="data", # The path part attached to the API endpoint parent_id=api.root_resource_id, # Attaching resource to the API's root path ) # Create a POST method for the /data resource that invokes the Lambda function data_method = aws.apigateway.Method("dataMethod", rest_api=api.id, resource_id=data_resource.id, http_method="POST", authorization="NONE", # Integration between the method and the Lambda function integration=aws.apigateway.IntegrationArgs( rest_api=api.id, resource_id=data_resource.id, http_method="POST", type="AWS", # Specify the Lambda function as the integration point uri=data_processor.invoke_arn, integration_http_method="POST", request_templates={ "application/json": '{ "statusCode": 200 }' # This is the mapping of the payload sent to the backend }, ), ) # Create a deployment to make the API Gateway accessible api_deployment = aws.apigateway.Deployment("apiDeployment", rest_api=api.id, # Forces a new deployment on the update stage_name="v1", # Associate the deployment with the /data POST method triggers={ "redeployment": data_method.http_method.apply(lambda method: method + "-" + data_resource.path_part) }, ) pulumi.export("invoke_url", pulumi.Output.concat("https://", api.id, ".execute-api.", aws.config.region, ".amazonaws.com/v1/data"))

    In the program above:

    • We first define a Lambda function data_processor, which will process incoming requests. The Lambda function code is stored in a directory named data_processor, and the handler is named lambda_handler inside a file named handler.py. Ensure your function code and IAM role are ready with the necessary permissions.

    • We create a REST API api using aws.apigateway.RestApi. It acts as a container for our resources, methods, and integrations.

    • We define a new API resource data_resource under the API, mapped to the path /data.

    • We implement a POST method for the /data resource with data_method. It's configured to allow public unauthenticated access (authorization="NONE") and to invoke the previously defined Lambda function when called.

    • We use aws.apigateway.Integration to connect the POST method to the Lambda function, so incoming data is sent to our data_processor when the API endpoint is hit.

    • The api_deployment is used to deploy the API to a stage so that it becomes publicly accessible. We're using the triggers argument to create a new deployment anytime there's a change to our method settings.

    Finally, we export the API invoke URL so that you can interact with the deployed API to process data in real time.

    Make sure to replace some_role.arn with an actual IAM role ARN that grants your Lambda function the necessary permissions to run and to access other AWS resources.