node-geoip2.js

var mmdb = require('./lib/node_mmdb.node');
var path = require('path');

var _defaultPath = path.resolve(__dirname, './databases/GeoLite2-City.mmdb');
var _defaultDB   = null;

exports.MMDB = mmdb.MMDB;

exports.init = function(path) {
  _defaultDB = new mmdb.MMDB(path || _defaultPath);
  return _defaultDB;
}

exports.cleanup = function() {
  _defaultDB = null;
}

exports.lookup = function(address, callback) {
  if (!_defaultDB) {
    console.log("WARNING: ipgeo2 database not initialized, initializing default now.");
    exports.init();
  }
  _defaultDB.lookup(address, callback);
}

exports.lookupSync = function(address) {
  if (!_defaultDB) {
    console.log("WARNING: ipgeo2 database not initialized, initializing default now.");
    exports.init();
  }
  return _defaultDB.lookupSync(address);
}

function parseResult(result) {
  return {
    country:     result.country ? result.country.iso_code : undefined,
    continent:   result.continent ? result.continent.code : undefined,
    postal:      result.postal ? result.postal.code : undefined,
    city:        result.city && result.city.names ? result.city.names.en : undefined,
    location:    result.location,
    subdivision: result.subdivisions ? result.subdivisions[0].iso_code : undefined
  };
}

exports.lookupSimple = function(address, callback) {
  exports.lookup(address, function(error, result) {
    if (result) {
      callback(null, parseResult(result));
    }
    else {
      callback(error, null);
    }
  });
}

exports.lookupSimpleSync = function(address) {
  var result = exports.lookupSync(address);
  if (result) {
    return parseResult(result);
  }
  return null;
}