@studio/lambda

Studio Lambda

A custom AWS Lambda execution environment for local testing. Runs each Lambda function in it's own process. Integrates with Studio Gateway. Defaults are tailored for apex.

Usage

const Lambda = require('@studio/lambda');

const lambda = Lambda.create();
lambda.invoke('some-lambda', { some: 'event' }, callback);

API

• lambda = Lambda.create([options]): Returns a new Lambda controller for the given options.
  • base_dir: The base directory to use. Defaults to the current working directory.
  • lambda_path: The path to the Lambda function. Replaces ${LAMBDA_NAME} with the Lambda name. Defaults to functions/${LAMBDA_NAME}/.
  • env: An object with environment variables to use. Defaults to an empty object.
  • config_file: A JSON file with additional environment and timeout properties. Defaults to functions/${LAMBDA_NAME}/function.${AWS_PROFILE}.json. Placeholders in the form of ${ENV_VAR} are replaced with the corresponding environment variable.
  • timeout: The default Lambda timeout to use in milliseconds. Defaults to 5 seconds.
  • max_idle: The idle timeout to use in milliseconds. If a function is not invoked for this time, the process gets destroyed. Defaults to 1 hour.
• lambda.invoke(lambda_name, event[, context], callback): Invokes the named Lambda handle function, passing (event, context, callback). If context is not given, it defaults to an object with these properties:
  • invokedFunctionArn: The function ARN, build from the AWS_REGION (defaulting to us-east-1), STUDIO_AWS_ACCOUNT (defaulting to 0000) and the Lambda function name.

Debugging Lambda functions

If the environment variable STUDIO_LAMBDA_INSPECT is set to the name of a Lambda function, the node process for that function will be called with --inspect and the timeout value is ignored. This prints a Chrome debugger URL to the console. With this setup in place, you can add debugger statements to place breakpoints.