This is a very simple demonstration of the code required to deploy a Java AWS Lambda Function and expose the function with AWS API Gateway. The infrastructure configuration and deployment is executed using HashiCorp's Terraform programmable infrastructure tool.
To get started simply create a terraform.tfvars file in terraform
directory with your AWS account/IAM User details. Your IAM User must have
permissions
for AWS Lambda and AWS API Gateway.
The contents should follow the template below (with you replacing the info
between << >>):
aws_access_key = "<< your IAM user AWS access key >>"
aws_secret_key = "<< your IAM user AWS secret key >>"
region = "<< your chosen region >>"
account_id = "<<your AWS account id>>"
From the root of the project run the build_and_deploy.sh script.
This compiles the Java application into the helloworld/target directory
and runs Terraform to upload and configure the Lambda function and API Gateway.
$ ./build_and_deploy.sh
After a successful run, something similar to the output below should be visible:
Outputs:
curl = curl -H 'Content-Type: application/json' -X POST -d '{"name": "Daniel"}' https://XXXXXXXXXX.execute-api.eu-west-1.amazonaws.com/beta/helloworld
To test your Lambda deployed behind the API Gateway all you need to do is
copy/paste the curl command (minus the curl = part) e.g.
curl -H 'Content-Type: application/json' -X POST -d '{"name": "Daniel"}' https://XXXXXXXXXX.execute-api.eu-west-1.amazonaws.com/beta/helloworld
You can make changes to the Java application and run the build_and_deploy.sh
script repeatedly to update the Lambda Function deployed into AWS.
When you are finished, don't forget to shut your infrastructure down:
$ ./destroy.sh
Please note: I'm not responsible for any costs incurred within your AWS account :-)