Sébastien Stormacq
a5ff8e5c00
Add Hummingbird web framework integration example for AWS Lambda **Motivation:** Developers using the Hummingbird web framework need a clear example of how to integrate it with AWS Lambda. The existing examples focus on basic Lambda handlers, but don't demonstrate how to use popular Swift web frameworks like Hummingbird in a serverless context. **Modifications:** Added a complete Hummingbird Lambda example in Examples/Hummingbird/ including Package.swift with Hummingbird Lambda dependencies, main.swift demonstrating router setup with API Gateway V2 integration, SAM template for deployment, and comprehensive README documentation with build, deploy, and usage instructions. **Result:** Developers can now easily create AWS Lambda functions using the Hummingbird web framework, with a working example that shows router configuration, API Gateway integration, and complete deployment workflow using familiar Hummingbird syntax.
Hummingbird Lambda
This is a simple example of an AWS Lambda function using the Hummingbird web framework, invoked through an Amazon API Gateway.
Code
The Lambda function uses Hummingbird's router to handle HTTP requests. It defines a simple GET endpoint at /hello that returns "Hello".
The code creates a Router with AppRequestContext (which is a type alias for BasicLambdaRequestContext<APIGatewayV2Request>). The router defines HTTP routes using Hummingbird's familiar syntax.
The APIGatewayV2LambdaFunction wraps the Hummingbird router to make it compatible with AWS Lambda and API Gateway V2 events.
APIGatewayV2Request is defined in the Swift AWS Lambda Events library, and the Hummingbird Lambda integration is provided by the Hummingbird Lambda package.
Build & Package
To build the package, type the following commands.
swift build
swift package archive --allow-network-connections docker
If there is no error, there is a ZIP file ready to deploy.
The ZIP file is located at .build/plugins/AWSLambdaPackager/outputs/AWSLambdaPackager/HBLambda/HBLambda.zip
Deploy
The deployment must include the Lambda function and the API Gateway. We use the Serverless Application Model (SAM) to deploy the infrastructure.
Prerequisites : Install the SAM CLI
The example directory contains a file named template.yaml that describes the deployment.
To actually deploy your Lambda function and create the infrastructure, type the following sam command.
sam deploy \
--resolve-s3 \
--template-file template.yaml \
--stack-name HummingbirdLambda \
--capabilities CAPABILITY_IAM
At the end of the deployment, the script lists the API Gateway endpoint. The output is similar to this one.
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Outputs
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Key APIGatewayEndpoint
Description API Gateway endpoint URL"
Value https://a5q74es3k2.execute-api.us-east-1.amazonaws.com
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Invoke your Lambda function
To invoke the Lambda function, use this curl command line to call the /hello endpoint.
curl https://a5q74es3k2.execute-api.us-east-1.amazonaws.com/hello
Be sure to replace the URL with the API Gateway endpoint returned in the previous step.
This should print:
Hello
Undeploy
When done testing, you can delete the infrastructure with this command.
sam delete