private void OnClientDataReceived(object sender, DataReceivedEventArgs e)
{
if (!MessageConstructor.ValidateMessage(e.Data))
{
if (StopAndWait)
{
byte[] msg = MessageConstructor.GetDataReceived(uint.MinValue, uint.MaxValue);
Client.Send(msg, msg.Length);
}
return;
}
if (MessageConstructor.IsHandshake(e.Data))
{
Connect(BitConverter.ToUInt32(e.Data, 1), BitConverter.ToUInt32(e.Data, 1 + sizeof(int)), e.EndPoint);
return;
}
if (IsTransfering && MessageConstructor.IsFileData(e.Data))
{
ReceivePacket(MessageConstructor.GetPacket(e.Data));
return;
}
if (MessageConstructor.IsFileMeta(e.Data))
{
TotalPacketCount = BitConverter.ToUInt32(e.Data, 1 + sizeof(long));
string fn = Encoding.ASCII.GetString(e.Data, 1 + sizeof(long) + sizeof(uint), e.Data.Length - 1 - sizeof(long) - sizeof(uint) - sizeof(uint));
PrepareFile(fn);
ReceivedPackets = new DataPacket[TotalPacketCount];
Console.WriteLine($"Receiving file '{fn}', total of {TotalPacketCount} packets.");
WriteStatus(0, TotalPacketCount, false);
Client.Send(e.Data, e.Data.Length);
//Client.ErrorRate = 0.001;
//Client.DropRate = 0.01;
}
if (IsTransfering && MessageConstructor.IsFileEnd(e.Data))
{
WriteFile();
uint hash = BitConverter.ToUInt32(e.Data, 1);
uint computed = MessageConstructor.GetFileHash(FileName);
if (hash == computed)
{
FileReceived?.Invoke(this, new FileReceivedEventArgs()
{
FileName = FileName
});
_is_transfering = false;
}
else
{
Console.WriteLine("Something is wrong, received different hash.");
_is_transfering = false;
}
}
}
//uint last_ack = 0;
public void SendFile(string path)
{
DeliveredPacketCount = 0;
_is_transfering = true;
string file_name = Path.GetFileName(path);
int buffer_size = (int)MaxPacketLength - DataPacket.MiscLength;
// poslu FileMeta msg a pockam na odpoved - Handshake se stejnymi hodnotami
FileInfo finfo = new FileInfo(path);
uint pack_cnt = (uint)(finfo.Length / buffer_size + (finfo.Length % buffer_size > 0 ? 1 : 0));
//zkratit file_name, aby se veslo do maximalni delky packetu
if (file_name.Length > (MaxPacketLength - sizeof(byte) - sizeof(long) - sizeof(int) - sizeof(uint)))
{
file_name = file_name.Substring((int)(MaxPacketLength - sizeof(byte) - sizeof(long) - sizeof(int) - sizeof(uint)));
}
byte[] msg = MessageConstructor.GetFileMeta(finfo.Length, pack_cnt, file_name);
Client.Send(msg, msg.Length, Target);
while (meta_response == null)
{
}
if (!Extensions.AreSameArrays(msg, meta_response))
{
meta_response = null;
throw new Exception("Invalid FileMeta response");
}
meta_response = null;
// kdykoliv to bude mozne, tak budu posilat packety...
// array - vsechny aktualni nepotvrzene packety
uint packet_num = 0;
// v tomto HashSetu jsou indexy packetu, ktere jsou potvrzene, tudiz je mozne je pouzit
AckPackets = new HashSet <int>();
for (int i = 0; i < MaxPackets; ++i)
{
AckPackets.Add(i);
}
//int buffer_size = (int)MaxPacketLength - //packet length
// 1 - //packet type
// sizeof(uint) - //number of packet
// sizeof(uint) - //data length
// sizeof(uint); //CRC
//indkuje, ze je potreba zrusit nejaky cyclus, pouziti ruzne
bool break_cycle;
WriteStatus(DeliveredPacketCount, pack_cnt, false);
Client.ErrorRate = 0.1;
Client.DropRate = 0.1;
using (BinaryReader reader = new BinaryReader(File.Open(path, FileMode.Open, FileAccess.Read)))
{
byte[] read_buffer = new byte[buffer_size];
while (reader.BaseStream.Position != reader.BaseStream.Length)
{
int act_count = reader.Read(read_buffer, 0, buffer_size);
if (act_count < 0)
{
}
// cekam na volny packet
int idx;
while (true)
{
PacketsMutex.WaitOne();
break_cycle = AckPackets.Count > 0;
PacketsMutex.ReleaseMutex();
if (break_cycle)
{
break;
}
Thread.Sleep(20);
}
PacketsMutex.WaitOne();
idx = AckPackets.Pop();
PacketsMutex.ReleaseMutex();
//Nastvaim hodnoty volneho packetu
// nemelo by byt potreba nastavovat PacketMutext, protoze jina vlakna by v tento moment nemela pristupovat k datum ktera chci upravovat
//PacketsMutex.WaitOne();
Packets[idx].Data = MessageConstructor.GetFileData(packet_num, read_buffer, (uint)act_count);
Packets[idx].Number = packet_num;
Packets[idx].AckCount = 0;
//PacketsMutex.ReleaseMutex();
Client.SendPacket(Packets[idx], Target);
//zvysuji cislo packetu
packet_num++;
WriteStatus(DeliveredPacketCount, pack_cnt);
}
}
//v tento moment jsou vsechnz packety dorucene ci na ceste, cekam na ack vsech prave posilanych
while (true)
{
PacketsMutex.WaitOne();
// tedy vsechny packety jsou volne
break_cycle = AckPackets.Count >= MaxPackets;
PacketsMutex.ReleaseMutex();
WriteStatus(DeliveredPacketCount, pack_cnt);
if (break_cycle)
{
break;
}
Thread.Sleep(20);
}
// poslu FileEnd msg
//TODO: vypocet File hash
byte[] file_end = MessageConstructor.GetFileEnd(MessageConstructor.GetFileHash(file_name));
Client.Send(file_end, file_end.Length, Target);
// jine vlakno prijme reakci na file_end message a pokud to nebude uspokojiva odpoved, zopakuje zaslani...
}
