public void Perform()
{
using (var client = ClientModel.Get())
{
var chat = client.Chat;
var room = chat.GetRoom(_roomName);
if (chat.IsFileDownloading(_fileId))
{
throw new ModelException(ErrorCode.FileAlreadyDownloading, _fileId);
}
var file = room.TryGetFile(_fileId);
if (file == null)
{
throw new ModelException(ErrorCode.FileInRoomNotFound);
}
if (chat.User.Equals(file.Id.Owner))
{
throw new ModelException(ErrorCode.CantDownloadOwnFile);
}
chat.AddFileDownload(new DownloadingFile(file, _savePath));
var sendingContent = new ClientReadFilePartCommand.MessageContent
{
File = file.ToDto(),
Length = AsyncClient.DefaultFilePartSize,
RoomName = _roomName,
StartPartPosition = 0,
};
ClientModel.Peer.SendMessage(file.Id.Owner, ClientReadFilePartCommand.CommandId, sendingContent);
}
}
protected override void OnRun(MessageContent content, CommandArgs args)
{
if (content.File == null)
{
throw new ArgumentNullException("content.File");
}
if (args.Unpacked.RawData == null)
{
throw new ArgumentNullException("args.Unpacked.RawData");
}
if (args.Unpacked.RawLength <= 0)
{
throw new ArgumentException("args.Unpacked.RawLength <= 0");
}
if (content.StartPartPosition < 0)
{
throw new ArgumentException("content.StartPartPosition < 0");
}
if (string.IsNullOrEmpty(content.RoomName))
{
throw new ArgumentException("content.RoomName");
}
var fileId = content.File.Id;
var progress = 0;
using (var client = ClientModel.Get())
{
var chat = client.Chat;
var downloading = chat.TryGetFileDownload(fileId);
if (downloading == null)
{
return;
}
var stream = downloading.WriteStream;
var filePart = args.Unpacked.RawData;
var filePartLength = args.Unpacked.RawLength;
if (stream.Position == content.StartPartPosition)
{
stream.Write(filePart, 0, filePartLength);
}
if (stream.Position >= content.File.Size)
{
chat.RemoveFileDownload(fileId);
progress = 100;
}
else
{
var sendingContent = new ClientReadFilePartCommand.MessageContent
{
File = content.File,
Length = AsyncClient.DefaultFilePartSize,
RoomName = content.RoomName,
StartPartPosition = stream.Position,
};
ClientModel.Peer.SendMessage(args.ConnectionId, ClientReadFilePartCommand.CommandId, sendingContent);
progress = (int)((stream.Position * 100) / content.File.Size);
}
}
ClientModel.Notifier.DownloadProgress(new FileDownloadEventArgs(content.RoomName, fileId, progress));
}