private void UpdateContext(RemoteState oldRemoteState, RemoteState newRemoteState, WatcherChangeTypes changeType)
{
switch (changeType)
{
case WatcherChangeTypes.Deleted:
// remote state was deleted
// actions: remove remote state from database
_context.RemoteStates.Remove(oldRemoteState);
break;
// remote state was created or modified
// actions: create or update database state
case WatcherChangeTypes.Changed:
case WatcherChangeTypes.Created:
case WatcherChangeTypes.Renamed:
if (oldRemoteState != null)
{
_context.RemoteStates.Remove(oldRemoteState);
}
_context.RemoteStates.Add(newRemoteState);
break;
// nothing changed
default:
break;
}
}
private IEnumerable <DriveItem> SafelyEnumerateDriveItems(string folderPath, CryptoDriveContext context, [CallerMemberName] string callerName = "")
{
var forceNew = callerName == nameof(this.SafelyEnumerateDriveItems);
var driveItems = Enumerable.Empty <DriveItem>();
var absoluteFolderPath = folderPath.ToAbsolutePath(this.BasePath);
try
{
// get all folders in current folder
driveItems = driveItems.Concat(Directory.EnumerateDirectories(absoluteFolderPath, "*", SearchOption.TopDirectoryOnly)
.SelectMany(current =>
{
RemoteState oldRemoteState = null;
var driveInfo = new DirectoryInfo(current).ToDriveItem(this.BasePath);
var folderPath2 = current.Substring(this.BasePath.Length).NormalizeSlashes();
if (!forceNew)
{
oldRemoteState = context.RemoteStates.FirstOrDefault(remoteState => remoteState.GetItemPath() == folderPath2 &&
remoteState.Type == DriveItemType.Folder);
}
// When we know that the parent folder is not in the database (oldRemoteState == null),
// the children aren't there neither (forceNew = true).
if (forceNew || oldRemoteState == null)
{
return(this.SafelyEnumerateDriveItems(folderPath2, context)
.Concat(new DriveItem[] { driveInfo }));
}
else
{
return new List <DriveItem> {
driveInfo
}
};
}));
// get all files in current folder
driveItems = driveItems.Concat(Directory.EnumerateFiles(absoluteFolderPath)
.SelectMany(current =>
{
var driveInfo = new FileInfo(current).ToDriveItem(this.BasePath);
return(new List <DriveItem> {
driveInfo
});
}).ToList());
// get all deleted items
var remoteStates = context.RemoteStates.Where(current => current.Path == folderPath);
var deletedItems = remoteStates.Where(current =>
{
switch (current.Type)
{
case DriveItemType.Folder:
return(!Directory.Exists(current.GetItemPath().ToAbsolutePath(this.BasePath)));
case DriveItemType.File:
return(!File.Exists(current.GetItemPath().ToAbsolutePath(this.BasePath)));
case DriveItemType.RemoteItem:
default:
throw new NotSupportedException();
}
}).Select(current => current.ToDriveItem(deleted: true));
driveItems = driveItems.Concat(deletedItems);
return(driveItems);
}
catch (UnauthorizedAccessException)
{
return(driveItems);
}
}