/// <summary>
/// Handles the deletion of a chunk of the file
/// </summary>
/// <param name="currentFileChunk">The P2PChunk to be deleted</param>
/// <param name="currentFile">The P2PFile to wich the chunk belongs</param>
/// <returns></returns>
public bool ChunkDeleter(P2PChunk currentFileChunk, P2PFile currentFile){
Listener listener = new Listener(this._port);
int lastIndex = currentFileChunk.peers.Count - 1;
//Sends a delete message to every peer with the chunk
for (int i = lastIndex; i >= 0; i--) {
if (_peers.TryGetValue(currentFileChunk.peers[i], out Peer currentReceiver)) {
if (!currentReceiver.IsOnline()){
return false;
}
var deletionMessage = new FileDeletionMessage(currentReceiver) {
type = TypeCode.REQUEST,
statusCode = StatusCode.OK,
port = _port,
fileHash = currentFileChunk.hash,
fullFileHash = currentFile.hash
};
//Sends the message and waits for a response,
//which will then overwrite the original sent message
if (listener.SendAndAwaitResponse(ref deletionMessage, 2000)) {
if (deletionMessage.type.Equals(TypeCode.RESPONSE)) {
currentFileChunk.RemovePeer(deletionMessage.fromUuid);
if (currentFileChunk.peers.Count == 0) {
currentFile.RemoveChunk(currentFileChunk.hash);
}
if (deletionMessage.statusCode.Equals(StatusCode.FILE_NOT_FOUND)) {
DiskHelper.ConsoleWrite("File not found at peer");
}
}
}
}
}
return true;
}
/// <summary>
/// Function to receive a deletion request of files on the receiver's computer
/// </summary>
/// <param name="message">The message with the chunks which has to be deleted</param>
private void ReceivedDeletionRequest(FileDeletionMessage message)
{
DiskHelper.ConsoleWrite("Deletion Message Received.");
if (!message.type.Equals(TypeCode.REQUEST))
{
return;
}
if (!message.statusCode.Equals(StatusCode.OK))
{
return;
}
string path = _path + @".hidden\" + message.fromUuid + @"\" + message.fullFileHash + @"\" +
message.fileHash;
DiskHelper.ConsoleWrite(path);
if (File.Exists(path))
{
File.Delete(path);
message.statusCode = StatusCode.ACCEPTED;
message.CreateReply();
message.Send(message.port);
}
else
{
message.statusCode = StatusCode.FILE_NOT_FOUND;
message.CreateReply();
message.Send(message.port);
}
}
