Code coverage report for ec2/doesInstanceExist.js

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'use strict'
 
var Bluebird = require('bluebird')
var isEmpty = require('lodash/lang/isEmpty')
 
/**
 * Checks if the identifier is formatted like an instanceId
 *
 * i.e "i-e69990ea"
 *
 * @param identifier
 * @returns {boolean}
 */
function isInstanceId (identifier) {
  return /^i-[a-z0-9]{8}$/.test(identifier)
}
 
/**
 * Builds the correct set of params depending on whether or not the
 * identifier is an instanceId or a name.
 *
 * @param {state} instanceState
 * @param {string} identifier
 * @returns {object} params for the ec2.describeInstances call.
 */
function buildParams (identifier, instanceState) {
  var params = {}
 
  if (instanceState) {
    params.Filters = [
      {
        Name: 'instance-state-name',
        Values: [instanceState]
      }
    ]
  }
 
  if (isInstanceId(identifier)) {
    params.InstanceIds = [identifier]
    return params
  }
 
  params.Filters = params.Filters || []
 
  params.Filters.push({
    Name: 'tag:Name',
    Values: [identifier]
  })
 
  return params
}
 
/**
 * Takes an identifier, either an InstanceId or Name Tag and returns whether the
 * instance exists in any state. The second instanceState allows specification
 * of the state the machine is in. Will also return false if an error is thrown
 * when given an invalid or non existent instance ID.
 *
 * i.e
 * doesInstanceExist('i-456ae390', 'running')
 * Will only return true if that instance exists, and is in a running state.
 *
 * @param ec2
 * @param {string} identifier Instance Name Tag or InstanceId
 * @param instanceState
 * @returns {*}
 */
function doesInstanceExist (ec2, identifier, instanceState) {
  var params = buildParams(identifier, instanceState)
 
  function inspectError (err) {
    if (err.code === 'InvalidInstanceID.NotFound') {
      return false
    }
 
    return Bluebird.reject(err)
  }
 
  return ec2
    .describeInstancesPromised(params)
    .then(function checkResult (data) {
      return !isEmpty(data.Reservations)
    })
    .catch(inspectError)
}
 
module.exports = doesInstanceExist