byte[] getBinaryMessage(P2PMessage p2PMessage)
{
MemoryStream ms = new MemoryStream();
serializer.Serialize(ms, p2PMessage);
byte[] send_buffer = ms.ToArray();
return(send_buffer);
}
static void serializeAndWrite(P2PMessage p2PMessage)
{
string path = @"C:\Users\ayanamists\source\repos\P2PDownload\P2PDownload\test";
var stream = new MemoryStream();
var serializer = new BinarySerializer();
serializer.Serialize(stream, p2PMessage);
WriteToFile($"{path}\\{p2PMessage.type}", stream.ToArray());
}
public static List<P2PMessage> GenFromMS(MemoryStream ms)
{
var now_pos = 0;
List<P2PMessage> ret = new List<P2PMessage>();
var max_pos = ms.Position;
ms.Position = 0;
while (now_pos < max_pos) {
var buffer_head = new byte[8];
ms.Read(buffer_head, 0, 8);
var length = BitConverter.ToInt32(buffer_head, 4);
var type_value = BitConverter.ToInt32(buffer_head);
var buffer_tail = new byte[length];
ms.Read(buffer_tail, 0, length);
var now_item = new P2PMessage();
switch (type_value)
{
case 0:
now_item = new GetDataMessage(buffer_tail);
break;
case 1:
now_item = new GetFileInfoMessage(buffer_tail);
break;
case 2:
now_item = new GetBlockInfoMessage(buffer_tail);
break;
case 3:
now_item = new DataMessage(buffer_tail);
break;
case 4:
now_item = new ErrorMessage(buffer_tail);
break;
case 5:
now_item = new FileInfoMessage(buffer_tail);
break;
case 6:
now_item = new BlockInfoMessage(buffer_tail);
break;
case 7:
now_item = new OKMessage(buffer_tail);
break;
case 8:
now_item = new CloseMessage();
break;
case 9:
now_item = new AliveMessage();
break;
default:
throw new System.Exception("not allow");
}
now_item.type = (P2PMessageType)type_value;
ret.Add(now_item);
now_pos += 8 + length;
}
Debug.Assert(now_pos == max_pos);
return ret;
}
static void TestParse(P2PMessage p2PMessage)
{
string path = @"C:\Users\ayanamists\source\repos\P2PDownload\P2PDownload\test";
var i = ReadFromFile($"{path}\\{p2PMessage.type}");
var r = P2PMessage.GenFromBuffer(i.Item1, i.Item2);
var stream = new MemoryStream();
var serializer = new BinarySerializer();
serializer.Serialize(stream, p2PMessage);
WriteToFile($"{path}\\{p2PMessage.type}-2", stream.ToArray());
}
void ReadToBuffer(int maxMessage)
{
var s = tcpCilent.GetStream();
// 调节缓冲区大小，修改此变量
var buffer_size = 5000;
var buffer = new byte[buffer_size];
var length4Read = -1;
var count = 0;
var size = 0;
while (count < maxMessage)
{
tcpCilent.ReceiveTimeout = 80;
try
{
do
{
if (length4Read == -1)
{
size = s.Read(buffer, 0, 8);
length4Read = P2PMessage.TryParseHeader(buffer);
}
else if (length4Read == 0)
{
count++; length4Read = -1; break;
}
else
{
var read_size = (length4Read > buffer_size) ? buffer_size : length4Read;
size = s.Read(buffer, 0, read_size);
length4Read -= size;
}
_logger.Info($"read {size} bytes from socket, length for read is {length4Read}");
ms.Write(buffer, 0, size);
} while (s.DataAvailable);
}
catch (IOException)
{
_logger.Info($"Recive timeout");
break;
}
}
}
public List <P2PMessage> GetReply(int maxReplyMessage)
{
ReadToBuffer(maxReplyMessage);
return(P2PMessage.GenFromMS(ms));
}
void send(P2PMessage message)
{
_logger.Info($"send {message.type}, length {message.length}");
send(getBinaryMessage(message));
}
static void send(P2PMessage message, TcpClient client)
{
_logger.Info($"send {message.type}");
send(getBinaryMessage(message), client);
}
void handleLoop(TcpClient client)
{
System.Timers.Timer t = new System.Timers.Timer(200);
var s = client.GetStream();
bool ifClose = false;
Stopwatch stopwatch = new Stopwatch();
var continueTime = 0L;
bool ifAlive = true;
while (!ifClose && client.Connected)
{
if (continueTime > 500)
{
if (ifAlive)
{
continueTime = 0;
ifAlive = false;
}
else
{
ifClose = true;
break;
}
}
stopwatch.Start();
try
{
_logger.Info("enter loop");
var waitConstant = 1;
var count = 0;
var ms = new MemoryStream();
var length4Read = -1;
while (count < waitConstant)
{
client.ReceiveTimeout = 100;
// 如果想要调节缓冲区大小，修改此变量
var buffer_size = 5000;
var buffer = new byte[buffer_size];
var size = 0;
do
{
if (length4Read == 0)
{
count++;
break;
}
else if (length4Read == -1)
{
size = s.Read(buffer, 0, 8);
length4Read = P2PMessage.TryParseHeader(buffer);
if (BitConverter.ToInt32(buffer) == (int)P2PMessageType.GET_OK)
{
waitConstant = 2;
}
else
{
waitConstant = 1;
}
}
else
{
var read_size = (length4Read > buffer_size) ? buffer_size : length4Read;
size = s.Read(buffer, 0, read_size);
length4Read = length4Read - size;
}
ms.Write(buffer, 0, size);
_logger.Info($"now recv buffer is {BitConverter.ToString(ms.ToArray())}, length for read is {length4Read}, count is {count}");
} while (s.DataAvailable);
}
var what = P2PMessage.GenFromMS(ms);
foreach (var i in what)
{
ifAlive = true;
_logger.Info($"recive message : {i.type}");
if (i.type == P2PMessageType.GET_FILE_INFO)
{
var hash = ((GetFileInfoMessage)i).hash;
// 在这里，我使用绑定到TCP四元组的本机地址作为传回的本机地址。
var localAddress = ((IPEndPoint)client.Client.RemoteEndPoint).Address;
SendFileInfoMessage(fmanager.ProvideLocateInfo(hash, localAddress), hash, client);
}
else if (i.type == P2PMessageType.GET_DATA)
{
var message = (GetDataMessage)i;
var hash = message.hash;
var indexs = message.what;
byte[] send_buffer;
try
{
foreach (var index in indexs)
{
send_buffer = fmanager.ProvideFileData(hash, index);
send(new DataMessage(send_buffer, hash, index), client);
}
}
catch (BlockNotPresentException)
{
send(new ErrorMessage(hash, indexs[0]), client);
}
}
else if (i.type == P2PMessageType.GET_OK)
{
var message = (OKMessage)i;
var remote_ip = ((IPEndPoint)client.Client.RemoteEndPoint).Address;
fmanager.SetRemoteBlockPresentStat(
message.block.hashOfFile,
remote_ip,
message.block.index,
true);
}
else if (i.type == P2PMessageType.CLOSE)
{
ifClose = true;
}
}
}
catch (IOException)
{
_logger.Debug($"timeout for receive : {client.Client.RemoteEndPoint}");
break;
}
stopwatch.Stop();
continueTime += stopwatch.ElapsedMilliseconds;
}
}
