Alexa Skill to fetch latest house temperature reading from Cloudant

myhousetemperature.js

var main = function(msg) {

  // check for mandatory parameters
  if (!msg.url || !msg.dbname) {
    return new Error('url and dbname are required');
  }

  // form Cloudant URL
  var url = msg.url + '/' + msg.dbname + '/_design/fetch/_view/byDate?limit=1&reduce=false&descending=true';
  var request = require('request');

  // return a Promise
  return new Promise(function(resolve, reject) {

    // fetch the latest reading
    request.get(url, function(err, res, body) {
      if (err) {
        return reject(err);
      }
      body = JSON.parse(body);

      // formulate the response
      var response = {
        version: '1.0',
        response: {
          shouldEndSession: true,
          outputSpeech: {
            type: 'PlainText',
            text: 'The temperature is ' + body.rows[0].value + ' degrees Celcius.'
          }
        }
      };
      var reply = {
        statusCode: 200,
        headers: { 'Content-Type': 'application/json' },
        body: new Buffer(JSON.stringify(response)).toString('base64')
      };
      return resolve(reply);
    });

  });
}