restaurants/services/google.js

Search a service and get a list of restaurants.

/**
 * Dependencies
 */

var findAll = require('./find-all')
  , get = require('superagent').get;

/**
 * Google Constants
 */

var ENDPOINT = 'https://maps.googleapis.com/maps/api/place/nearbysearch/json'
  , KEY = process.env.GOOGLE_API_KEY
  , MAX_LIMIT = 20
  , MAX_OFFSET = 40;

/**
 * Expose search function
 */

module.exports = function(lat, lng, radius, all, callback) {
  if (!KEY) throw new Error('Environment variable GOOGLE_API_KEY must be set.');

  var query = {
    key: KEY
  , location: lat + ',' + lng
  , radius: radius
  , sensor: false
  , types: 'restaurant'
  };

  if (all) {
    findAll(query, MAX_LIMIT, MAX_OFFSET, getRestaurants, callback);
  } else {
    getRestaurants(query, 10, 0, callback);
  }
};

/**
 * Save the next page token for paging
 */

var next_page_token = null
  , more_pages = true;

/**
 * Get the restaurants
 */

function getRestaurants(query, limit, offset, callback) {
  if (next_page_token) {
    query.pagetoken = next_page_token;
  }

  if (query.pagetoken && !next_page_token) {
    return callback(null, []);
  }

  setTimeout(function() {
    get(ENDPOINT)
    .query(query)
    .end(function(err, res) {
      if (err) {
        callback(err);
      } else {
        next_page_token = res.body.next_page_token;
        callback(err, res.body.results);
      }
    });
  }, 2000);
}