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Sockets.cs
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Sockets.cs
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using log4net;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Sockets;
using System.Reflection;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
namespace NU.Kqml
{
static class SocketUtil
{
private static readonly ILog _log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
public static IPEndPoint getInterNetworkEndPoint(string hostNameOrAddress, int port)
{
_log.Debug($"getInterNetworkEndPoint, hostNameOrAddress: '{hostNameOrAddress}'");
IPHostEntry ipHostInfo = Dns.GetHostEntry(hostNameOrAddress);
IPAddress ipAddress = null;
IPEndPoint localEndPoint = null;
foreach (IPAddress ipa in ipHostInfo.AddressList)
{
_log.Debug($"getInterNetworkEndPoint, ipa: '{ipa.ToString()}'; ipa.AddressFamily: '{ipa.AddressFamily}'");
if (ipa.AddressFamily == AddressFamily.InterNetwork)
{
ipAddress = ipa;
localEndPoint = new IPEndPoint(ipAddress, port);
return localEndPoint;
}
}
IPEndPoint end = new IPEndPoint(IPAddress.Parse(hostNameOrAddress), port);
_log.Debug($"getInterNetworkEndPoint, end: '{end}'");
//IPEndPoint localEndPoint = new IPEndPoint(ipAddress, port);
//_log.Info("IPHostEntry:" + ipHostInfo.ToString());
//_log.Info("IPAddress:" + ipAddress.ToString());
//_log.Info("AddressFamily:" + ipAddress.AddressFamily);
//_log.Info("IsLoopback:" + IPAddress.IsLoopback(ipAddress));
//_log.Info("IPEndPoint:" + localEndPoint.ToString());
return end;
}
}
abstract class AbstractSimpleSocket
{
public delegate void onmessage(string msg, AbstractSimpleSocket handler);
public onmessage OnMessage
{
get;
set;
}
public abstract void Send(string data);
}
// see https://docs.microsoft.com/en-us/dotnet/framework/network-programming/synchronous-client-socket-example
class SimpleSocket : AbstractSimpleSocket
{
private static readonly ILog _log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
private Socket sender;
private IPEndPoint remoteEP;
public SimpleSocket(string ipAddress, int port)
{
// Establish the remote endpoint for the socket.
// This example uses port 11000 on the local computer.
remoteEP = SocketUtil.getInterNetworkEndPoint(ipAddress, port);
}
public void Connect()
{
// Connect the socket to the remote endpoint. Catch any errors.
try
{
if (sender == null) {
// Create a TCP/IP socket.
sender = new Socket(AddressFamily.InterNetwork,
SocketType.Stream, ProtocolType.Tcp);
}
if (!sender.Connected)
{
sender.Connect(remoteEP);
}
//_log.Info("Socket connected to {0}",
// sender.RemoteEndPoint.ToString());
}
catch (ArgumentNullException ane)
{
_log.Error($"Connect: ArgumentNullException : {ane.ToString()}");
}
catch (SocketException se)
{
_log.Error($"Connect: SocketException : {se.ToString()}");
}
catch (Exception e)
{
_log.Error($"Connect: Unexpected exception : {e.ToString()}");
}
}
public override void Send(string data)
{
//_log.Info("Sending " + data);
// Data buffer for incoming data.
byte[] bytes = new byte[1024];
try
{
// Encode the data string into a byte array.
byte[] msg = Encoding.ASCII.GetBytes(data);
// Send the data through the socket.
int bytesSent = sender.Send(msg);
if (bytesSent == msg.Length)
{
//_log.Info($"All {bytesSent} bytes sent");
}
else
{
_log.Warn("Send: WARNING: Message not completely sent");
}
// Receive the response from the remote device.
int bytesRec = sender.Receive(bytes);
string resp = Encoding.ASCII.GetString(bytes, 0, bytesRec);
_log.Debug($"Send: in response, facilitator said {resp}");
OnMessage(resp, this);
}
catch (ArgumentNullException ane)
{
_log.Info($"Send: ArgumentNullException : {ane.ToString()}");
}
catch (SocketException se)
{
if (se.SocketErrorCode == SocketError.ConnectionAborted)
{
_log.Error("Send: Socket closed by Facilitator");
}
else
{
_log.Error($"Send: SocketException : {se.ToString()}");
_log.Error($"Send: SocketError : {se.SocketErrorCode}");
}
}
catch (Exception e)
{
_log.Error($"Send: Unexpected exception : {e.ToString()}");
}
Close();
}
public void Close()
{
try
{
// Release the socket.
if (sender != null)
{
sender.Shutdown(SocketShutdown.Both);
sender.Close();
}
sender = null;
}
catch (SocketException se)
{
_log.Error($"Close: SocketException : {se.ToString()}");
}
catch (Exception e)
{
_log.Error($"Close: Unexpected exception : {e.ToString()}");
}
}
}
class StateObject
{
// Client socket.
public Socket workSocket = null;
// Size of receive buffer.
public const int BufferSize = 1024;
// Receive buffer.
public byte[] buffer = new byte[BufferSize];
// Received data string.
public StringBuilder sb = new StringBuilder();
}
// see https://docs.microsoft.com/en-us/dotnet/framework/network-programming/synchronous-server-socket-example
class SimpleSocketServer : AbstractSimpleSocket
{
private static readonly ILog _log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
// Incoming data from the client.
public static string data = null;
private int port = 9001;
private Socket listener = null;
private Socket handler = null;
private Boolean running = true;
public SimpleSocketServer(int port)
{
this.port = port;
}
public static ManualResetEvent allDone = new ManualResetEvent(false);
public void StartListening()
{
Thread myThread;
myThread = new Thread(new ThreadStart(StartListening_thread));
myThread.Start();
}
public void StartListening_thread()
{
// Data buffer for incoming data.
byte[] bytes = new Byte[1024];
// Establish the local endpoint for the socket.
// Dns.GetHostName returns the name of the
// host running the application.
IPEndPoint localEndPoint = SocketUtil.getInterNetworkEndPoint(Dns.GetHostName(), port);
// Create a TCP/IP socket.
listener = new Socket(AddressFamily.InterNetwork,
SocketType.Stream, ProtocolType.Tcp);
// Bind the socket to the local endpoint and
// listen for incoming connections.
try
{
listener.Bind(localEndPoint);
listener.Listen(10);
// Start listening for connections.
while (running)
{
// Set the event to nonsignaled state.
allDone.Reset();
//_log.Info("Waiting for a connection on " + localEndPoint.ToString() + ":" + this.port);
listener.BeginAccept(new AsyncCallback(AcceptCallback), listener);
allDone.WaitOne();
}
}
catch (Exception e)
{
_log.Error($"StartListening_thread: {e.ToString()}");
}
//_log.Info("\nPress ENTER to continue...");
//Console.Read();
}
public void AcceptCallback(IAsyncResult ar)
{
// Signal the main thread to continue
allDone.Set();
// Get the socket that handles the client request.
Socket listener = (Socket)ar.AsyncState;
try
{
Socket handler = listener.EndAccept(ar);
// Create the state object.
StateObject state = new StateObject();
state.workSocket = handler;
handler.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0, new AsyncCallback(ReadCallback), state);
} catch (ObjectDisposedException e)
{
_log.Error($"Listening socket disposed");
}
}
public void ReadCallback(IAsyncResult ar)
{
String content = String.Empty;
// Retrieve the state object and the handler socket
// from the asynchronous state object.
StateObject state = (StateObject)ar.AsyncState;
handler = state.workSocket;
if (handler != null)
{
// Read data from the client socket.
int bytesRead = handler.EndReceive(ar);
if (bytesRead > 0)
{
// There might be more data, so store the data received so far.
state.sb.Append(Encoding.ASCII.GetString(
state.buffer, 0, bytesRead));
content = state.sb.ToString();
//_log.Info("Read {0} bytes from socket. \n Data : {1}",
// content.Length, content);
if (handler.Available > 0)
{
handler.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0,
new AsyncCallback(ReadCallback), state);
} else
{
OnMessage(content, this);
}
}
}
}
public override void Send(String data)
{
// Convert the string data to byte data using ASCII encoding.
byte[] byteData = Encoding.ASCII.GetBytes(data);
//Console.Write($"ByteData: ");
//for (int i = 0, l = byteData.Length; i < l; i++)
//{
// Console.Write($"-{byteData[i]}- ");
//}
//_log.Info();
if (handler != null)
{
try
{
// Begin sending the data to the remote device.
handler.BeginSend(byteData, 0, byteData.Length, 0,
new AsyncCallback(SendCallback), handler);
} catch (Exception e)
{
_log.Error($"Send: error during send '{data}'; trace: {e.StackTrace}");
}
} else
{
_log.Error($"Send: ERROR: Not able to reply with {data}");
}
}
private void SendCallback(IAsyncResult ar)
{
try
{
// Retrieve the socket from the state object.
Socket handler = (Socket)ar.AsyncState;
// Complete sending the data to the remote device.
int bytesSent = handler.EndSend(ar);
//_log.Info("Sent {0} bytes to client.", bytesSent);
handler.Shutdown(SocketShutdown.Both);
handler.Close();
}
catch (Exception e)
{
_log.Error($"SendCallback: {e.ToString()}");
}
}
public void Close()
{
running = false;
if (listener != null) listener.Close();
}
}
}