mirror of https://bitbucket.org/anguist/ntpa
242 lines
7.8 KiB
C#
242 lines
7.8 KiB
C#
//
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// Copyright (c) 2013-2017 Carsten Sonne Larsen <cs@innolan.net>
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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using System;
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using System.Globalization;
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using System.Net;
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using System.Net.Sockets;
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using System.Text;
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using System.Threading;
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using Ntp.Common.Log;
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namespace Ntp.Analyzer.Monitor.Server
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{
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public sealed class Listener : IDisposable
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{
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/// <summary>
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/// Initializes a new instance of the <see cref="Listener" /> class.
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/// </summary>
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/// <param name="ip">IP Address to listen on.</param>
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/// <param name="port">Port number.</param>
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/// <param name="log">Log.</param>
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public Listener(string ip, int port, LogBase log)
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{
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IPAddress address = IPAddress.Parse(ip);
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endPoint = new IPEndPoint(address, port);
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this.log = log;
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shuttingDown = false;
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}
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private readonly IPEndPoint endPoint;
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private readonly LogBase log;
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private Socket listenSocket;
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private bool shuttingDown;
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/// <summary>
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/// Close this listener.
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/// </summary>
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public void Close()
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{
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shuttingDown = true;
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listenSocket.Close();
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}
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/// <summary>
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/// Open this listener.
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/// </summary>
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public void Open()
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{
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try
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{
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listenSocket = new Socket(
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AddressFamily.InterNetwork,
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SocketType.Stream,
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ProtocolType.Tcp);
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listenSocket.Bind(endPoint);
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listenSocket.Listen(3);
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listenSocket.BeginAccept(AcceptCallback, null);
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}
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catch (Exception ex)
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{
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log.WriteLine("Error while initializing listener " + ToString(), Severity.Error);
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log.WriteLine(ex.Message, Severity.Debug);
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log.WriteLine(ex, Severity.Trace);
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}
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}
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public override string ToString()
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{
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return endPoint.ToString();
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}
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/// <summary>
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/// Accepts the callback from client.
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/// </summary>
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/// <param name="asyncAccept">Async accept.</param>
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private void AcceptCallback(IAsyncResult asyncAccept)
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{
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try
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{
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Socket serverSocket = listenSocket.EndAccept(asyncAccept);
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if (serverSocket.Connected == false)
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return;
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var req = new Request(128, serverSocket);
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serverSocket.BeginReceive(
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req.Buffer,
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0,
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req.Buffer.Length,
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SocketFlags.None,
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ReceiveCallback,
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req);
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}
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catch (Exception ex)
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{
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if (!shuttingDown)
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{
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log.WriteLine("Unexpected error in listener " + ToString(), Severity.Error);
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log.WriteLine(ex.Message, Severity.Debug);
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log.WriteLine(ex, Severity.Trace);
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}
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}
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}
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/// <summary>
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/// Receives the callback from client.
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/// </summary>
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/// <param name="asyncReceive">Async receive.</param>
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private void ReceiveCallback(IAsyncResult asyncReceive)
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{
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try
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{
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var req = (Request) asyncReceive.AsyncState;
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int size = req.Socket.EndReceive(asyncReceive);
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req.ReSize(size);
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// Process request
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Command command = CommandFactory.Create(req.Command, req.Arguments);
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// Force correct time format in strings, etc.
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Thread.CurrentThread.CurrentCulture = CultureInfo.InvariantCulture;
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byte[] sendBuffer;
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if (command == null)
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{
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sendBuffer = Encoding.UTF8.GetBytes("Unknown command");
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}
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else
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switch (command.CommandType)
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{
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case CommandType.Binary:
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sendBuffer = (byte[]) command.Execute();
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break;
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case CommandType.Text:
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var text = command.Execute() as string;
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sendBuffer = text != null ? Encoding.UTF8.GetBytes(text) : new byte[] {0};
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break;
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default:
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sendBuffer = Encoding.UTF8.GetBytes("Error in command module. Unknown command type.");
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break;
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}
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req.Socket.BeginSend(
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sendBuffer,
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0,
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sendBuffer.Length,
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SocketFlags.None,
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SendCallback,
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req.Socket);
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}
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catch (Exception ex)
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{
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log.WriteLine("Unexpected error in listener " + ToString(), Severity.Error);
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log.WriteLine(ex.Message, Severity.Debug);
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log.WriteLine(ex, Severity.Trace);
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}
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}
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/// <summary>
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/// Sends the callback response to client.
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/// </summary>
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/// <param name="asyncSend">Async send.</param>
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private void SendCallback(IAsyncResult asyncSend)
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{
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try
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{
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var serverSocket = (Socket) asyncSend.AsyncState;
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serverSocket.EndSend(asyncSend);
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serverSocket.Shutdown(SocketShutdown.Both);
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serverSocket.Close();
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// Start new worker socket.
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listenSocket.BeginAccept(AcceptCallback, null);
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}
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catch (Exception ex)
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{
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log.WriteLine("Unexpected error in listener " + ToString(), Severity.Error);
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log.WriteLine(ex.Message, Severity.Debug);
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log.WriteLine(ex, Severity.Trace);
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}
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}
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#region IDisposable Support
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private bool disposedValue;
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private void Dispose(bool disposing)
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{
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if (disposedValue)
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return;
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if (disposing && listenSocket != null)
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{
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if (listenSocket.Connected)
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{
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listenSocket.Shutdown(SocketShutdown.Both);
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listenSocket.Close();
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}
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listenSocket.Dispose();
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listenSocket = null;
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}
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disposedValue = true;
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}
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~Listener()
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{
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Dispose(false);
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}
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public void Dispose()
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{
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Dispose(true);
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GC.SuppressFinalize(this);
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}
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#endregion
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}
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} |