immortal-handler.js

import AWS from 'aws-sdk';

export const handler = async (event, context, callback) => {
  // Coming from environment variables setup in your `serverless.yaml` file
  // See https://serverless.com/framework/docs/providers/aws/guide/variables/#referencing-environment-variables
  const { RUNNER, SUBNET } = process.env;
  const ecs = new AWS.ECS();

  // Some other logic specific to your case here ...

  try {
    const runParams = {
      taskDefinition: RUNNER,
      launchType: 'FARGATE',
      networkConfiguration: {
        awsvpcConfiguration: {
          assignPublicIp: 'ENABLED',
          subnets: [SUBNET],
        },
      },
      overrides: {
        containerOverrides: [
          {
            environment: [
              {
                name: 'AWS_LAMBDA_FUNCTION_EVENT',
                value: JSON.stringify(event),
              },
              // Help the runner locate the handler to run inside a container.
              {
                name: 'AWS_LAMBDA_HANDLER_PATH',
                // Matches path/to/immortal-handler.handler
                value: 'path/to/immortal-handler.js',
              },
              {
                name: 'AWS_LAMBDA_FUNCTION_CONTEXT',
                value: JSON.stringify(context),
              },
              ...
            ],
            name: RUNNER,
          },
        ],
      },
    };

    const result = await ecs.runTask(runParams).promise();
    // Returns null
    return callback(null, result);
  } catch (e) {
    return callback(e);
  }
};

export default handler;