public async Task <ActionResult> Create(SongViewModel songViewModel)
{
// if model is invalid return back the view again
if (!ModelState.IsValid)
{
return(View(songViewModel));
}
// get current timestamp
DateTime timestamp = DateTime.Now;
// Create a new song instance based on the form data from the view model
Song song = new Song
{
Created = timestamp,
Modified = timestamp,
Title = songViewModel.Title,
Artist = songViewModel.Artist,
MidiFileName = songViewModel.MidiFileHandler.FileName,
ChordsFileName = songViewModel.ChordsFileHandler.FileName,
MelodyTrackIndex = songViewModel.MelodyTrackIndex,
IsPublic = songViewModel.IsPublic && User.IsInRole(RoleName.Admin),
UserId = this.User.Identity.GetUserId(),
};
// set name for the playback file to be created based on the midi file
song.SetPlaybackName();
// save the new song in the database
_databaseGateway.Songs.Add(song);
await _databaseGateway.CommitChangesAsync();
// save the files of the new song on the file server
IMidiFile playbackFile = null;
try
{
// create a new directory for the new song
string directoryPath = await GetSongPath(song.Id);
Directory.CreateDirectory(directoryPath);
// save the midi file in the new directory
string midiFileFullPath = directoryPath + song.MidiFileName;
songViewModel.MidiFileHandler.SaveAs(midiFileFullPath);
// save the midi playback file in the new directory
string midiPlaybackFullPath = directoryPath + song.MidiPlaybackFileName;
playbackFile = CompositionContext.CreateMidiPlayback(songViewModel.MidiFileHandler.InputStream, song.MelodyTrackIndex);
playbackFile.SaveFile(outputPath: midiPlaybackFullPath, pathIncludesFileName: true);
// save the chord progression file in the new directory
string chordsFilefullPath = directoryPath + song.ChordsFileName;
songViewModel.ChordsFileHandler.SaveAs(chordsFilefullPath);
}
catch (Exception ex)
{
// in case of failure, rollback DB changes and log error message
_databaseGateway.Songs.Remove(song);
await _databaseGateway.CommitChangesAsync();
HomeController.WriteErrorToLog(HttpContext, ex.Message);
}
finally
{
// release open unmanaged resources
songViewModel.ChordsFileHandler?.InputStream?.Dispose();
songViewModel.MidiFileHandler?.InputStream?.Dispose();
playbackFile?.Stream?.Dispose();
}
// If creation was successful, redirect to new song details page
string successMessage = $"The Song '{song.Title}' by '{song.Artist}' was successfully uploaded.";
return(RedirectToAction(nameof(Details), new { Id = song.Id, message = successMessage }));
}