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API Gateway and Cloud Development Kit

This is a simple example of an AWS Lambda function invoked through an Amazon API Gateway and deployed with the Cloud Development Kit (CDK).

Code

The Lambda function takes all HTTP headers it receives as input and returns them as output. See the API Gateway example for a complete description of the code.

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/APIGatewayLambda/APIGatewayLambda.zip

Deploy

[NOTE] Before deploying the infrastructure, you need to have NodeJS and the AWS CDK installed and configured. For more information, see the AWS CDK documentation.

To deploy the infrastructure, type the following commands.

# Change to the infra directory
cd infra

# Install the dependencies (only before the first deployment)
npm install 

cdk deploy

✨  Synthesis time: 2.88s
... redacted for brevity ...
Do you wish to deploy these changes (y/n)? y
... redacted for brevity ...
 ✅  LambdaApiStack

✨  Deployment time: 42.96s

Outputs:
LambdaApiStack.ApiUrl = https://tyqnjcawh0.execute-api.eu-central-1.amazonaws.com/
Stack ARN:
arn:aws:cloudformation:eu-central-1:401955065246:stack/LambdaApiStack/e0054390-be05-11ef-9504-065628de4b89

✨  Total time: 45.84s

Invoke your Lambda function

To invoke the Lambda function, use this curl command line.

curl https://tyqnjcawh0.execute-api.eu-central-1.amazonaws.com

Be sure to replace the URL with the API Gateway endpoint returned in the previous step.

This should print a JSON similar to

{"version":"2.0","rawPath":"\/","isBase64Encoded":false,"rawQueryString":"","headers":{"user-agent":"curl\/8.7.1","accept":"*\/*","host":"a5q74es3k2.execute-api.us-east-1.amazonaws.com","content-length":"0","x-amzn-trace-id":"Root=1-66fb0388-691f744d4bd3c99c7436a78d","x-forwarded-port":"443","x-forwarded-for":"81.0.0.43","x-forwarded-proto":"https"},"requestContext":{"requestId":"e719cgNpoAMEcwA=","http":{"sourceIp":"81.0.0.43","path":"\/","protocol":"HTTP\/1.1","userAgent":"curl\/8.7.1","method":"GET"},"stage":"$default","apiId":"a5q74es3k2","time":"30\/Sep\/2024:20:01:12 +0000","timeEpoch":1727726472922,"domainPrefix":"a5q74es3k2","domainName":"a5q74es3k2.execute-api.us-east-1.amazonaws.com","accountId":"012345678901"}

If you have jq installed, you can use it to pretty print the output.

curl -s  https://tyqnjcawh0.execute-api.eu-central-1.amazonaws.com | jq   
{
  "version": "2.0",
  "rawPath": "/",
  "requestContext": {
    "domainPrefix": "a5q74es3k2",
    "stage": "$default",
    "timeEpoch": 1727726558220,
    "http": {
      "protocol": "HTTP/1.1",
      "method": "GET",
      "userAgent": "curl/8.7.1",
      "path": "/",
      "sourceIp": "81.0.0.43"
    },
    "apiId": "a5q74es3k2",
    "accountId": "012345678901",
    "requestId": "e72KxgsRoAMEMSA=",
    "domainName": "a5q74es3k2.execute-api.us-east-1.amazonaws.com",
    "time": "30/Sep/2024:20:02:38 +0000"
  },
  "rawQueryString": "",
  "routeKey": "$default",
  "headers": {
    "x-forwarded-for": "81.0.0.43",
    "user-agent": "curl/8.7.1",
    "host": "a5q74es3k2.execute-api.us-east-1.amazonaws.com",
    "accept": "*/*",
    "x-amzn-trace-id": "Root=1-66fb03de-07533930192eaf5f540db0cb",
    "content-length": "0",
    "x-forwarded-proto": "https",
    "x-forwarded-port": "443"
  },
  "isBase64Encoded": false
}

Undeploy

When done testing, you can delete the infrastructure with this command.

cdk destroy

Are you sure you want to delete: LambdaApiStack (y/n)? y
LambdaApiStack: destroying... [1/1]
... redacted for brevity ...
 ✅  LambdaApiStack: destroyed