//[Authorize]
public async Task <HttpResponseMessage> UploadChunkAsync()
{
SqlConnection myConnection = new SqlConnection();
SqlTransaction myTransaction;
using (myConnection)
{
myConnection.ConnectionString = ConnectionContext.GetConnectionString();
myConnection.Open();
// TRANSACTION - in case of SQL error or File write to disk error - rollback will be awailable
myTransaction = myConnection.BeginTransaction("UploadFileTransaction");
try
{
SetUserDetails();
HttpResponseMessage response;
String responseMsg;
// check if such hash has record in DB.
CFile newFile = _fileContext.GetByHash(fileInfo.Hash, myConnection, myTransaction);
// if such hash and exist in DB and user names match
if (!newFile.Guid.Equals(Guid.Empty) && newFile.UserId.Equals(user.Guid))
{
response = Request.CreateResponse(HttpStatusCode.BadRequest);
response.ReasonPhrase = $"Another file {newFile.Name} with same hash than{fileInfo.Name} already exists on Media Server!";
return(response);
}
// check if such file name has record in DB.
newFile = _fileContext.GetByFileName(fileInfo.Name, user.Guid, myConnection, myTransaction);
// if file with such name already exists in DB
if (!newFile.Guid.Equals(Guid.Empty))
{
// file exits, it has hash (so it is 100% loaded), but hash is different, which means this is the other file!
if (newFile.Hash != null)
{
response = Request.CreateResponse(HttpStatusCode.BadRequest);
response.ReasonPhrase = $"Another file {newFile.Name} with same hash than{fileInfo.Name} already exists on Media Server!";
return(response);
}
else
{
// file exists, but it has no hash, so it hasn't been 100% loaded - continue loading
}
}
// fileName not found in DB - create new file record
else
{
// add record to DB with file info
newFile = new CFile(fileInfo, user, userFolder);
// create record in DB about new file
Int32 added = _fileContext.Create(newFile, myConnection, myTransaction);
if (added == 0)
{
response = Request.CreateResponse(HttpStatusCode.BadRequest, $"Cannot add file to DB!");
return(response);
}
// SQL generates primary field values, so get created file back with proper Guid
newFile = _fileContext.GetByFileName(newFile.Name, user.Guid, myConnection, myTransaction);
// add file to all playlists specified by user. Default playlist is 'ON' if no other playlists are specified.
if (fileInfo.playlists.Count == 0)
{
CPlaylist playlist = _playlistContext.GetByName("default", user.Guid);
_fileContext.AddToPlaylist(newFile.Guid, playlist.Guid, myConnection, myTransaction);
}
else
{
// add files to other playlists specified by user
foreach (CPlaylistInfo playlistInfo in fileInfo.playlists)
{
CPlaylist playlist = new CPlaylist(playlistInfo);
_fileContext.AddToPlaylist(newFile.Guid, playlist.Guid, myConnection, myTransaction);
}
}
}
// After all checks on existing files, continue loading given chunk of byte data
//todo: upload directly to memory stream or to file stream?
MemoryStream ms = new MemoryStream(new byte[chunkSize], true);
using (ms)
{
await Request.Content.CopyToAsync(ms);
// check if all bytes from the chunk have been loaded (no disconnect or program crash happened during load)
if (ms.Length == chunkSize)
{
using (FileStream fs = new FileStream
(newFile.Path + newFile.Name, FileMode.Append, FileAccess.Write, FileShare.None, chunkSize, useAsync: true))
{
ms.WriteTo(fs);
}
}
else
{
// couldn't upload file chunk - so rollback record from DB
myTransaction.Rollback();
response = Request.CreateResponse(HttpStatusCode.OK, $"Chunk has not been uploaded correctly!");
return(response);
}
}
responseMsg = $"Chunk for file:{newFile.Name} successfully uploaded!";
// calculate Hash only if file has been loaded 100%
if (isLastChunk)
{
// calculate Hash only if file has been loaded 100%
await Task.Factory.StartNew(() => HashFile(newFile)).ContinueWith(delegate
{
// calculate Thumbnail for video only if file has been loaded 100%
CreateThumbnail(newFile);
});
responseMsg = $"File successfully uploaded!";
}
// update file data in DB: hash, fileSize, ...
newFile.Size += chunkSize;
_fileContext.Update(newFile, myConnection, myTransaction);
// if all went OK, commit records to DB
myTransaction.Commit();
// return response if success
response = Request.CreateResponse(HttpStatusCode.OK, responseMsg);
return(response);
}
catch (Exception e)
{
myTransaction.Rollback();
HttpContext.Current.Response.StatusCode = (Int32)HttpStatusCode.BadRequest;
throw new FileUploadException(e.Message, e);
}
}
}
