app.js

'use strict';

var express = require('express');
var cors = require('cors');
var app = express();
var geocoder = require('./index.js');
var isGeocodeInitialized = false;

app.use(cors());

app.get('/healthcheck', function (req, res) {
  return res.status(200).send('OK');
});

app.get('/deep-healthcheck', function (req, res) {
  if (isGeocodeInitialized) {
    return res.status(200).send('OK');
  } else {
    return res.status(503).send('Not ready yet.');
  }
});

app.get('/geocode', function (req, res) {
  if (!isGeocodeInitialized) {
    return res.status(503).send('Not ready yet.');
  }

  var lat = req.query.latitude || false;
  var lon = req.query.longitude || false;
  var maxResults = req.query.maxResults || 1;
  if (!lat || !lon) {
    return res.status(400).send('Bad Request');
  }
  var points = [];
  if (Array.isArray(lat) && Array.isArray(lon)) {
    if (lat.length !== lon.length) {
      return res.status(400).send('Bad Request');
    }
    for (var i = 0, lenI = lat.length; i < lenI; i++) {
      points[i] = { latitude: lat[i], longitude: lon[i] };
    }
  } else {
    points[0] = { latitude: lat, longitude: lon };
  }
  geocoder.lookUp(points, maxResults, function (err, addresses) {
    if (err) {
      return res.status(500).send(err);
    }
    return res.send(addresses);
  });
});

var port = Number(process.env.PORT || 3000);
app.listen(port, function () {
  console.log('Local reverse geocoder listening on port ' + port);
  console.log('Initializing Geocoder…');
  console.log(
    '(This may take a long time and will download ~2.29GB worth of data by default.)'
  );
  geocoder.init(
    {
      citiesFileOverride: 'cities500',
      load: {
        admin1: true,
        admin2: true,
        admin3And4: true,
        alternateNames: true,
      },
      countries: [],
    },
    function () {
      console.log('Geocoder initialized and ready.');
      console.log('Endpoints:');
      console.log(`- http://localhost:${port}/healthcheck`);
      console.log(`- http://localhost:${port}/deep-healthcheck`);
      console.log(`- http://localhost:${port}/geocode`);
      console.log('Examples:');
      console.log(
        `- http://localhost:${port}/geocode?latitude=54.6875248&longitude=9.7617254`
      );
      isGeocodeInitialized = true;
    }
  );
});