/// <summary>
/// Manage the connected client
/// </summary>
/// <param name="result">TCPClient object</param>
/// <returns>Return a task, it is used to allow the Task asynchronous programming model (TAP)</returns>
public async Task ServeClient(object result)
{
NetworkStream stream = null;
TcpClient client = null;
Dictionary <string, FileRecvStatus> updateRecvDictionary = new Dictionary <string, FileRecvStatus>();
Dictionary <string, FileSendStatus> updateSendDictionary = new Dictionary <string, FileSendStatus>();
try {
client = (TcpClient)result;
Console.WriteLine($"{DateTime.Now.ToString()}\t - TCPListener Client connected! {((IPEndPoint)client.Client.RemoteEndPoint).Address.ToString()}");
byte[] bytes = new byte[1 + 256 + 8];
stream = client.GetStream();
int i = 0;
if ((i = await stream.ReadAsync(bytes, 0, bytes.Length)) != 0)
{
// The first byte define the type of the packet
byte[] readPacket = new byte[1];
Array.Copy(bytes, 0, readPacket, 0, 1);
// If it is not correct, send an Exception
if ((int)readPacket[0] > 5)
{
throw new Exception($"Packet not valid");
}
// The following 256 bytes are the name of the file (UTF8 coding)
PacketType type = (PacketType)readPacket[0];
readPacket = new byte[256];
Array.Copy(bytes, 1, readPacket, 0, 256);
string filename = "";
UTF8Encoding encoder;
// Trown an exception in case the sequence of bytes cannot be converted as a stirng
try {
encoder = new UTF8Encoding();
filename = encoder.GetString(readPacket);
filename = filename.Replace("\0", string.Empty);
}
catch (Exception e) {
throw new Exception($"Packet not valid - Reason {e.Message}");
}
long dimFile = 0;
string ipClient = ((IPEndPoint)client.Client.RemoteEndPoint).Address.ToString();
switch (type)
{
case PacketType.RFILE:
if (_referenceData.GetInfoLocalUser().AcceptAllFile)
{
_referenceData.AddOrUpdateRecvStatus(ipClient, filename, FileRecvStatus.YSEND);
await MainWindow.main.Dispatcher.BeginInvoke(DispatcherPriority.Normal, new Action(() => {
MainWindow.main.AddOrUpdateListFile(ipClient, filename, FileRecvStatus.YSEND, "-", 0.0f);
MainWindow.main.NotifySistem();
MainWindow.main.SendResponse(filename, ipClient, PacketType.YFILE);
}));
}
else
{
_referenceData.AddOrUpdateRecvStatus(ipClient, filename, FileRecvStatus.TOCONF);
await MainWindow.main.Dispatcher.BeginInvoke(DispatcherPriority.Normal, new Action(() => {
MainWindow.main.AddOrUpdateListFile(ipClient, filename, FileRecvStatus.TOCONF, "-", 0.0f);
MainWindow.main.NotifySistem();
}));
}
break;
case PacketType.YFILE:
if (_referenceData.UpdateSendStatusFileForUser(ipClient, filename, FileSendStatus.CONFERMED))
{
await MainWindow.main.Dispatcher.BeginInvoke(DispatcherPriority.Normal, new Action(() => {
MainWindow.main.AddOrUpdateListFile(ipClient, filename, FileSendStatus.CONFERMED, "-", 0);
MainWindow.main.SendFile(filename, ipClient);
}));
}
else
{
throw new Exception("No file with name " + filename + " was announced from this client");
}
break;
case PacketType.NFILE:
if (_referenceData.UpdateSendStatusFileForUser(ipClient, filename, FileSendStatus.REJECTED))
{
await MainWindow.main.Dispatcher.BeginInvoke(DispatcherPriority.Normal, new Action(() => {
MainWindow.main.AddOrUpdateListFile(ipClient, filename, FileSendStatus.REJECTED, "-", 0);
MainWindow.main.SendFile(filename, ipClient);
}));
}
else
{
throw new Exception("No file with name " + filename + " was announced from this client");
}
break;
case PacketType.FSEND:
{
if (_referenceData.CheckPacketRecvFileStatus(ipClient, filename))
{
throw new Exception("File with name " + filename + " never confirmed or need to be resend to the user");
}
string fileNameOriginal = filename;
readPacket = new byte[8];
Array.Copy(bytes, 257, readPacket, 0, 8);
try {
dimFile = BitConverter.ToInt64(readPacket, 0);
}
catch (Exception e) {
throw new Exception($"Packet not valid - Reason {e.Message}");
}
await ServeReceiveFile(client, stream, ipClient, filename, dimFile);
}
break;
case PacketType.CIMAGE:
readPacket = new byte[8];
Array.Copy(bytes, 257, readPacket, 0, 8);
try {
dimFile = BitConverter.ToInt64(readPacket, 0);
}
catch (Exception e) {
throw new Exception($"Packet not valid - Reason {e.Message}");
}
await ServeReceiveProfileImage(client, stream, ipClient, filename, dimFile);
break;
}
}
}
catch (SocketException e) {
Console.WriteLine($"{DateTime.Now.ToString()}\t - Serve TCPClient SocketException - {e.Message}");
}
catch (Exception e) {
Console.WriteLine($"{DateTime.Now.ToString()}\t - Serve TCPClient Exception - {e.GetType()} {e.Message}");
}
finally {
stream.Close();
client.Close();
}
}
/// <summary>
/// Send file to the remote user that accept it
/// </summary>
/// <param name="filename">File name</param>
/// <param name="ip">Ip remote user</param>
public async Task SendFile(string filename, string ip)
{
// Check if the file is in a status to be rended or if it was confirmed
if (!_referenceData.CheckPacketSendFileStatus(ip, filename))
{
return;
}
if (_referenceData.GetUserStatus(ip).Equals("offline"))
{
_referenceData.UpdateSendStatusFileForUser(ip, Utility.PathToFileName(filename), FileSendStatus.RESENT);
await MainWindow.main.Dispatcher.BeginInvoke(DispatcherPriority.Normal, new Action(() => {
MainWindow.main.AddOrUpdateListFile(ip, Utility.PathToFileName(filename), FileSendStatus.RESENT, "-", 0);
}));
return;
}
IPAddress serverAddr = IPAddress.Parse(ip);
// In case of exception resend the packet three times
TcpClient client = null;
NetworkStream stream = null;
if (!_referenceData.CheckPacketSendFileStatus(ip, filename))
{
return;
}
try {
client = new TcpClient();
await client.ConnectAsync(serverAddr.ToString(), SharedInfo.TCPPort).ConfigureAwait(false);
byte[] bytes = new byte[1 + 256 + 8];
// 1^ byte: packet type
bytes[0] = (byte)PacketType.FSEND;
// Following 256 bytes : file name
UTF8Encoding encorder = new UTF8Encoding();
encorder.GetBytes(Utility.PathToFileName(filename)).CopyTo(bytes, 1);
// Open file image
filename = Utility.PathTmp() + "\\" + filename;
using (var file = new FileStream(filename, FileMode.Open, FileAccess.Read, FileShare.Read, bufferSize * 1024, FileOptions.Asynchronous | FileOptions.SequentialScan))
{
// Following 8 bytes : file legth
BitConverter.GetBytes(file.Length).CopyTo(bytes, 257);
stream = client.GetStream();
// Primi 265 byte di header
await stream.WriteAsync(bytes, 0, 265).ConfigureAwait(false);
_referenceData.UpdateSendStatusFileForUser(serverAddr.ToString(), Utility.PathToFileName(filename), FileSendStatus.INPROGRESS);
await MainWindow.main.Dispatcher.BeginInvoke(DispatcherPriority.Normal, new Action(() => {
MainWindow.main.AddOrUpdateListFile(ip, Utility.PathToFileName(filename), FileSendStatus.INPROGRESS, "-", 0);
}));
// First 297 : header
bytes = new byte[bufferSize * 64];
int i;
long dataReceived = file.Length;
uint estimatedTimePacketCount = 0;
double numerator = 0.0;
double estimateTime = 0.0;
DateTime started = DateTime.Now;
TimeSpan estimatedTime = TimeSpan.FromSeconds(0);
while (((i = file.Read(bytes, 0, bytes.Length)) != 0) && dataReceived >= 0)
{
double dataReceivedJet = 0.0f;
if (_referenceData.CheckSendStatusFile(ip, Utility.PathToFileName(filename), FileSendStatus.REJECTED))
{
throw new RejectedFileException("File is rejected by remote host");
}
if (_referenceData.GetUserStatus(ip).Equals("offline"))
{
throw new Exception("User offline");
}
if (dataReceived > 0 && dataReceived < i)
{
await stream.WriteAsync(bytes, 0, Convert.ToInt32(dataReceived));
dataReceivedJet = 100f;
}
else
{
await stream.WriteAsync(bytes, 0, i);
dataReceivedJet = Math.Ceiling((double)(file.Length - dataReceived) / ((double)file.Length) * 100);
}
dataReceived -= i;
if (estimatedTimePacketCount < 5)
{
numerator += (double)(file.Length - dataReceived);
estimatedTimePacketCount++;
}
else
{
TimeSpan elapsedTime = DateTime.Now - started;
estimateTime = elapsedTime.TotalSeconds * dataReceived / numerator;
estimatedTime = TimeSpan.FromSeconds(estimateTime);
numerator = 0.0;
estimatedTimePacketCount = 0;
}
string estimatedTimeJet = string.Format("{00:00}", estimatedTime.Minutes) + ":" +
string.Format("{00:00}", estimatedTime.Seconds) + ":" +
string.Format("{00:00}", estimatedTime.Milliseconds);
await MainWindow.main.Dispatcher.BeginInvoke(DispatcherPriority.Normal, new Action(() => {
MainWindow.main.AddOrUpdateListFile(ip, Utility.PathToFileName(filename), FileSendStatus.INPROGRESS, estimatedTimeJet, dataReceivedJet);
}));
}
}
_referenceData.UpdateSendStatusFileForUser(serverAddr.ToString(), Utility.PathToFileName(filename), FileSendStatus.END);
await MainWindow.main.Dispatcher.BeginInvoke(DispatcherPriority.Normal, new Action(() => {
MainWindow.main.AddOrUpdateListFile(ip, Utility.PathToFileName(filename), FileSendStatus.END, "-", 100);
}));
} catch (RejectedFileException e) {
Console.WriteLine($"{DateTime.Now.ToString()}\t - RejectedFileException on SendFile - {e.Message}");
await MainWindow.main.Dispatcher.BeginInvoke(DispatcherPriority.Normal, new Action(() => {
MainWindow.main.AddOrUpdateListFile(ip, Utility.PathToFileName(filename), FileSendStatus.REJECTED, "-", 0);
}));
} catch (SocketException e) {
Console.WriteLine($"{DateTime.Now.ToString()}\t - SocketException on SendFile - {e.Message}");
_referenceData.UpdateSendStatusFileForUser(serverAddr.ToString(), Utility.PathToFileName(filename), FileSendStatus.REJECTED);
await MainWindow.main.Dispatcher.BeginInvoke(DispatcherPriority.Normal, new Action(() => {
MainWindow.main.AddOrUpdateListFile(ip, Utility.PathToFileName(filename), FileSendStatus.REJECTED, "-", 0);
}));
}
catch (Exception e) {
Console.WriteLine($"{DateTime.Now.ToString()}\t - Exception on SendFile - {e.Message}");
// If the remote host was offline, try to resend it for three times
_referenceData.UpdateSendStatusFileForUser(serverAddr.ToString(), Utility.PathToFileName(filename), FileSendStatus.REJECTED);
await MainWindow.main.Dispatcher.BeginInvoke(DispatcherPriority.Normal, new Action(() => {
MainWindow.main.AddOrUpdateListFile(ip, Utility.PathToFileName(filename), FileSendStatus.REJECTED, "-", 0);
}));
}
finally {
client.Close();
stream.Close();
}
}
