public void PerformFetch(UIApplication application, Action <UIBackgroundFetchResult> completionHandler)
{
try
{
var tdelay = Task.Delay(21 * 1000);
backgroundStatus = UIBackgroundFetchResult.NewData;
if (currentBackupTask == null)
{
currentBackupTask = Task.Run(BackgroundBackupImages);
}
var res = Task.WhenAny(new[] { tdelay, currentBackupTask }).Result;
if (res == currentBackupTask)
{
currentBackupTask = null;
completionHandler?.Invoke(backgroundStatus);
return;
}
completionHandler?.Invoke(UIBackgroundFetchResult.NewData);
}
catch (Exception e)
{
logger.LogError(e, "PerformFetch");
try
{
completionHandler?.Invoke(UIBackgroundFetchResult.Failed);
}
catch
{
}
}
}
async Task BackgroundBackupImages()
{
logger.LogTrace("Background App Refresh triggered.");
var cloud = Globals.CloudManager.PersonalClouds?[0];
if (cloud == null)
{
logger.LogError("Backup triggered while no Personal Cloud configured.");
backgroundStatus = UIBackgroundFetchResult.Failed;
return;
}
var worker = Globals.BackupWorker;
if (worker == null)
{
logger.LogError("Photo sync worker not initialized.");
backgroundStatus = UIBackgroundFetchResult.NoData;
return;
}
var path = Globals.Database.LoadSetting(UserSettings.PhotoBackupPrefix);
if (string.IsNullOrEmpty(path))
{
logger.LogError("Photo sync not configured.");
backgroundStatus = UIBackgroundFetchResult.Failed;
return;
}
try
{
WaitForPath(cloud, path);
}
catch (Exception exception)
{
logger.LogError(exception, "Exception occurred while wait for node appearing when backup photos.");
backgroundStatus = UIBackgroundFetchResult.NoData;
return;
}
try
{
var items = await worker.StartBackup(cloud.RootFS, path, true).ConfigureAwait(false);
backgroundStatus = UIBackgroundFetchResult.NoData;
}
catch
{
backgroundStatus = UIBackgroundFetchResult.Failed;
}
}