lambda_test_harness.js

var fs = require('fs');

// Lambda knows what region it's in but a local execution doesn't, so preload the SDK and set the region
// This will only work if the same variable name is used in the Lambda function file
var AWS = require('aws-sdk');
AWS.config.update({region: 'us-east-1'});


// validate arguments
if(process.argv.length < 4) {
    console.error('Usage: node lambda_test_harness.js <function file> <input file>');
    process.exit(1);
}


var context = {};
context.done = function(errorMessage, exitMessage) {
    var exitCode = 0;
    if(errorMessage) {
        console.error(errorMessage);
        exitCode = 1;
    }
    console.log(exitMessage);
    process.exit(exitCode);
}


var exports = {};

var fileToInclude = process.argv[2];
eval(fs.readFileSync(fileToInclude).toString());

var inputFile = process.argv[3];
var inputEvent = JSON.parse(fs.readFileSync(inputFile).toString());


// assume you're using the conventional function name
exports.handler(inputEvent, context);