Gets me up and running with my dev ec2 instance

dev_aws.js

#!/usr/bin/env node
const exec = require('child_process').exec;
const spawn = require('child_process').spawn;
const R = require('ramda');

const myInstance = 'your instance id';
const myKey = 'absolute path to your private key';
const myUser = 'username associated with the key pair';

function isInstanceOff(instanceJson) { 
  return instanceJson["State"]["Name"] === "stopped"; 
}

function isInstanceOn(instanceJson) {
  return instanceJson["State"]["Name"] === "running";
}

function waitForInstanceToComeOn(instanceId, callback) {
  function startWaiting(instanceId, callback, waits, maxWaits) {
    exec("aws ec2 describe-instances", function (error, stdout, stderr) {
      if (error !== null) {
        console.log('exec error: ' + error);
      } else {
        instanceJson = findInstance(JSON.parse(stdout), instanceId);
        if (isInstanceOn(instanceJson)) {
          return callback(instanceJson);
        } else if (waits === maxWaits) {
          console.log('waited ' + waits + ' times, aborting');
        }
        else {
          console.log('waiting for instance to come on');
          return setTimeout(function() { return startWaiting(instanceId, callback, waits+1, maxWaits) }, 5000);
        }
      }
    });
  }

  startWaiting(instanceId, callback, 0, 20);
}

function findInstance(describeJson, instanceId) {
  const instances = describeJson["Reservations"][0]["Instances"];

  return R.find(R.propEq('InstanceId', myInstance))(instances);
}

function turnInstanceOn(instanceJson, callback) {
  const instanceId = instanceJson["InstanceId"];
  exec("aws ec2 start-instances --instance-ids " + instanceId, function(error, stdout, stderr) {
    if (error !== null) {
      console.log('exec error: ' + error);
    } else {
      callback(instanceJson);
    }
  });
}

function getOnRunningInstance(instance) {
  const ip = instance["PublicIpAddress"];
  const address = myUser + '@' + ip;
  const args = ['-i', myKey, address];

  spawn('ssh', args, {stdio: 'inherit'});
}

exec("aws ec2 describe-instances", function (error, stdout, stderr) {
  if (error !== null) {
    console.log('exec error: ' + error);
  } else {
    const json = JSON.parse(stdout);
    const instance = findInstance(json, myInstance);
    
    if (isInstanceOff(instance)) {
      console.log('instance is off, turning on');
      turnInstanceOn(instance,
                     function(runningInstance) { waitForInstanceToComeOn(instance, getOnRunningInstance) });
    } else {
      getOnRunningInstance(instance);
    }
  }
});