Rocket.Chat/packages/autoupdate/autoupdate_cordova.js

var DEBUG_TAG = 'METEOR CORDOVA DEBUG (autoupdate_cordova.js) ';
var log = function (msg) {
  console.log(DEBUG_TAG + msg);
};
// This constant was picked by testing on iOS 7.1
// We limit the number of concurrent downloads because iOS gets angry on the
// application when a certain limit is exceeded and starts timing-out the
// connections in 1-2 minutes which makes the whole HCP really slow.
var MAX_NUM_CONCURRENT_DOWNLOADS = 30;
var MAX_RETRY_COUNT = 5;
var autoupdateVersionCordova = __meteor_runtime_config__.autoupdateVersionCordova || "unknown";

// The collection of acceptable client versions.
ClientVersions = new Mongo.Collection("meteor_autoupdate_clientVersions");

Autoupdate = {};

Autoupdate.newClientAvailable = function () {
  return !! ClientVersions.findOne({
    _id: 'version-cordova',
    version: {$ne: autoupdateVersionCordova}
  });
};

var hasCalledReload = false;
var updating = false;
var localPathPrefix = null;
var retry = new Retry({
  // Unlike the stream reconnect use of Retry, which we want to be instant
  // in normal operation, this is a wacky failure. We don't want to retry
  // right away, we can start slowly.
  //
  // A better way than timeconstants here might be to use the knowledge
  // of when we reconnect to help trigger these retries. Typically, the
  // server fixing code will result in a restart and reconnect, but
  // potentially the subscription could have a transient error.
  minCount: 0, // don't do any immediate retries
  baseTimeout: 30*1000 // start with 30s
});
var failures = 0;

Autoupdate._retrySubscription = function () {
  var appId = __meteor_runtime_config__.appId;
  Meteor.subscribe("meteor_autoupdate_clientVersions", appId, {
    onError: function (err) {
      Meteor._debug("autoupdate subscription failed:", err);
      failures++;
      retry.retryLater(failures, function () {
        // Just retry making the subscription, don't reload the whole
        // page. While reloading would catch more cases (for example,
        // the server went back a version and is now doing old-style hot
        // code push), it would also be more prone to reload loops,
        // which look really bad to the user. Just retrying the
        // subscription over DDP means it is at least possible to fix by
        // updating the server.
        Autoupdate._retrySubscription();
      });
    }
  });
  if (Package.reload) {
    var checkNewVersionDocument = function (doc) {
      var self = this;
      if (doc.version !== autoupdateVersionCordova) {
        window.fireGlobalEvent('onNewVersion', doc.version)
        // onNewVersion();
      }
    };

    var handle = ClientVersions.find({
      _id: 'version-cordova'
    }).observe({
      added: checkNewVersionDocument,
      changed: checkNewVersionDocument
    });
  }
};

Meteor.startup(Autoupdate._retrySubscription);


window.WebAppLocalServer = {};
WebAppLocalServer.startupDidComplete = function() {};
WebAppLocalServer.checkForUpdates = function() {};
WebAppLocalServer.onNewVersionReady = function() {};
WebAppLocalServer.onError = function() {};