ti.appConnectionHealth.js

/*
 * Below is the background service to monitor the health of the app internet connection.
 * It'll set a variable to tell any other controller what's going on with the current connection.
 * 1 = Everything's good.
 * 2 = Poor connectivity, but still have a connection.
 * 3 = We have internet, but are having problems with the API.
 * 4 = No internet.
 */

function appConnectionHealth() {
  connectionHealthApi = new Api();
  // console.log('Checking connection health ...');
  // First, check for internet.
  if (!Ti.Network.online) {
    console.log('No internet detected!');
    return requeue(4);
  }
  // Second, check for access to the API and measure loadtime.
  var startTime = new Date().getTime();
  var webClient = Titanium.Network.createHTTPClient({
    timeout: 10000
  });
  webClient.open("GET", connectionHealthApi.host);
  webClient.send();
  // Handles a success being returned.
  webClient.onload = function () {
    if (this.status == 200) {
      var endTime = new Date().getTime();
      var loadTime = endTime - startTime;
      if (loadTime < 5000) {
        requeue(1);
      } else {
        console.log('Poor connectivity detected!');
        console.log('Load Time: ' + loadTime);
        requeue(2);
      }
    } else {
      requeue(3);
    }
  };
  // Handles an error being returned.
  webClient.onerror = function () {
    console.log('onerror');
    console.log('Status: ' + this.status);
    console.log('Response: ' + this.responseText);
    requeue(3);
  };
  // Re-queue to run again shortly.
  function requeue(connectionStatus) {
    if (connectionStatus != storage.get('connectionStatus')) {
      Ti.App.fireEvent('connectionStateChange', {data: {connectionStatus: connectionStatus}});
    }
    storage.set('connectionStatus', connectionStatus);
    setTimeout(function () {
      appConnectionHealth();
    }, config.get('APP_HEALTH_THREAD_TIME'));
  }
};

appConnectionHealth();