AWS Lambda Ballerina Runtime

Currently, AWS Lambda only supports Node.js, Python, Java and C#. For enabling any other runtime on AWS Lambda a wrapper function can be implemented in one of the above languages. This project provides Java wrapper functions for supporting Ballerina functions on AWS Lambda via different trigger sources.

Deployment Architecture

The above diagram illustrates the deployment architecture of AWS Lambda Ballerina Runtime. The Java wrapper function implements com.amazonaws.services.lambda.runtime.RequestStreamHandler interface provided by AWS Lambda SDK for handling function requests. Currently, it has been implemented for exposing Lambda functions via the AWS API Gateway.

Background Information

Please refer the following article for detailed information on this topic: https://medium.com/ballerinalang/implementing-serverless-functions-with-ballerina-on-aws-lambda-7a325ddf810d

Quick Start

1. Clone this project:

   $ git clone https://github.com/imesh/aws-lambda-ballerina-runtime

2. Download and extract Ballerina runtime distribution:

   $ cd aws-lambda-ballerina-runtime
   $ wget http://ballerinalang.org/downloads/ballerina-runtime/ballerina-<version>.zip
   $ unzip ballerina-<version>.zip

3. Remove Ballerina zip file, version from the Ballerina folder name and the samples folder:

   $ rm ballerina-<version>.zip
   $ mv ballerina-<version>/ ballerina/
   $ rm -rf ballerina/samples/

4. Copy the Ballerina main function file to the project root folder:

   $ cp /path/of/bal/file/ /path/to/aws-lambda-ballerina-runtime/

   For an example if the Ballerina file name is "function.bal", the project folder may look as follows:

   $ ls
   README.md     ballerina/    build/        build.gradle  function.bal     src/

5. Build project using Gradle:

   gradle build

6. Upload build/distributions/aws-lambda-ballerina-runtime.zip file to AWS Lambda. If the zip file is larger than 10 MB, AWS recommends uploading via S3.

7. Set the handler name as follows and execute a test:

   org.ballerina.aws.lambda.runtime.ApiGatewayFunctionInvoker::handleRequest
   

   START RequestId: 674afc88-5641-11e7-b821-a148953e4faa Version: $LATEST
   Request received: {body={hello=ballerina}}
   Executing command: cp -r ballerina /tmp/ballerina
   Command executed in 27 ms, exit code: 0
   Executing command: cp echo.bal /tmp/echo.bal
   Command executed in 1 ms, exit code: 0
   Message body: {"hello":"ballerina"}
   Executing command: /tmp/ballerina/bin/ballerina run main /tmp/echo.bal {"hello":"ballerina"}
   Output: {"hello":"ballerina"}
   Command executed in 2226 ms, exit code: 0
   END RequestId: 674afc88-5641-11e7-b821-a148953e4faa
   REPORT RequestId: 674afc88-5641-11e7-b821-a148953e4faa	Duration: 2281.62 ms	Billed Duration: 2300 ms 	Memory Size: 1536 MB	Max Memory Used: 196 MB

References

• Scripting Languages for AWS Lambda: Running PHP, Ruby, and Go

License

Apache 2.0