hack to convert some semi-structured notes into bash aliases for aws, etc.

make-aws-aliases.js

#!/usr/bin/env node

const fs = require('fs');
const rimraf = require('rimraf'); // XXX remove this dependency
const format = require('util').format;

function createAliases(loadBalancers, targetDirectory) {
  var aliases = {};
  Object.keys(loadBalancers).forEach(function(key) {
    var lb = loadBalancers[key];
    var instances = lb.instances;
    for (var i = 0; i < instances.length; ++i) {
      var inst = instances[i];
      var name = "st" + inst.Name.slice(18) + "-" + (i + 1);
      aliases[name] = 'ssh root@' + inst.private_ip_address;
    }
  });

  Object.keys(aliases).forEach(function(alias) {
    fs.appendFileSync(format('%s/%s', targetDirectory, 'jumps'),
                      format("alias %s='%s'\n", alias, aliases[alias]));
  });
}

function createGroups(instances, targetDirectory) {
  var groups = {};
  Object.keys(instances).forEach(function(inst) {
    var ip = instances[inst].private_ip_address;
    var name = instances[inst].Name;
    name = name.match(/identity-dev-stage-(\S+)-/)[1];
    if (!groups[name]) groups[name] = [];
    groups[name].push(ip);
  });

  Object.keys(groups).forEach(function(group) {
    fs.writeFileSync(format('%s/%s', targetDirectory, group),
                     groups[group].join(' ') + '\n');
  });
}

(function run() {
  const targetDirectory = format('%s/%s', process.env.HOME, 'awsjumps');
  console.log('writing files to', targetDirectory);

  if (fs.existsSync(targetDirectory)) {
    rimraf.sync(targetDirectory);
    fs.mkdirSync(targetDirectory);
  }

  var filename = process.argv[2] || '/tmp/aws.json';
  console.log('reading', filename);

  var data = JSON.parse(fs.readFileSync(filename, 'utf8'));
  var instances = data.instances;
  var loadBalancers = data['load balancers'];
  var bastion = data.bastion_ip;

  createAliases(loadBalancers, targetDirectory);
  createGroups(instances, targetDirectory);

  console.log('bastion', '->', bastion);
  console.log('run this command:');
  console.log('  ', 'rsync -arv -e ssh -P %s/* root@%s:/root', targetDirectory, bastion);
})();