687 lines
21 KiB
C#
687 lines
21 KiB
C#
#region License
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/*
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* WebSocketServer.cs
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*
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* A C# implementation of the WebSocket protocol server.
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*
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* The MIT License
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*
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* Copyright (c) 2012-2013 sta.blockhead
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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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*/
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#endregion
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#region Thanks
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/*
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* Thanks:
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* Juan Manuel Lallana <juan.manuel.lallana@gmail.com>
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*/
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#endregion
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using System;
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using System.Collections.Generic;
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using System.Net.Sockets;
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using System.Security.Cryptography.X509Certificates;
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using System.Text;
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using System.Threading;
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using WebSocketSharp.Net;
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using WebSocketSharp.Net.WebSockets;
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namespace WebSocketSharp.Server
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{
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/// <summary>
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/// Provides the functions of the server that receives the WebSocket connection requests.
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/// </summary>
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/// <remarks>
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/// The WebSocketServer class provides the multi WebSocket service.
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/// </remarks>
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public class WebSocketServer
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{
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#region Private Fields
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private System.Net.IPAddress _address;
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private X509Certificate2 _cert;
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private TcpListener _listener;
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private Logger _logger;
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private int _port;
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private Thread _receiveRequestThread;
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private bool _secure;
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private WebSocketServiceHostManager _serviceHosts;
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private volatile ServerState _state;
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private object _sync;
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private Uri _uri;
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#endregion
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#region Public Constructors
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/// <summary>
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/// Initializes a new instance of the <see cref="WebSocketServer"/> class that listens for
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/// incoming requests on port 80.
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/// </summary>
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public WebSocketServer ()
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: this (80)
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{
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}
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/// <summary>
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/// Initializes a new instance of the <see cref="WebSocketServer"/> class that listens for
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/// incoming connection attempts on the specified <paramref name="port"/>.
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/// </summary>
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/// <param name="port">
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/// An <see cref="int"/> that contains a port number.
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/// </param>
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/// <exception cref="ArgumentOutOfRangeException">
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/// <paramref name="port"/> is not between 1 and 65535.
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/// </exception>
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public WebSocketServer (int port)
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: this (System.Net.IPAddress.Any, port)
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{
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}
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/// <summary>
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/// Initializes a new instance of the <see cref="WebSocketServer"/> class that listens for
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/// incoming connection attempts on the specified WebSocket URL.
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/// </summary>
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/// <param name="url">
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/// A <see cref="string"/> that contains a WebSocket URL.
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/// </param>
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/// <exception cref="ArgumentNullException">
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/// <paramref name="url"/> is <see langword="null"/>.
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/// </exception>
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/// <exception cref="ArgumentException">
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/// <paramref name="url"/> is invalid.
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/// </exception>
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public WebSocketServer (string url)
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{
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if (url == null)
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throw new ArgumentNullException ("url");
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string msg;
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if (!tryCreateUri (url, out _uri, out msg))
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throw new ArgumentException (msg, "url");
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var host = _uri.DnsSafeHost;
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_address = host.ToIPAddress ();
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if (_address == null || !_address.IsLocal ())
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throw new ArgumentException (String.Format (
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"The host part must be the local host name: {0}", host), "url");
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_port = _uri.Port;
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_secure = _uri.Scheme == "wss" ? true : false;
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init ();
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}
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/// <summary>
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/// Initializes a new instance of the <see cref="WebSocketServer"/> class that listens for
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/// incoming connection attempts on the specified <paramref name="port"/> and <paramref name="secure"/>.
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/// </summary>
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/// <param name="port">
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/// An <see cref="int"/> that contains a port number.
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/// </param>
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/// <param name="secure">
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/// A <see cref="bool"/> that indicates providing a secure connection or not.
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/// (<c>true</c> indicates providing a secure connection.)
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/// </param>
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/// <exception cref="ArgumentOutOfRangeException">
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/// <paramref name="port"/> is not between 1 and 65535.
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/// </exception>
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/// <exception cref="ArgumentException">
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/// Pair of <paramref name="port"/> and <paramref name="secure"/> is invalid.
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/// </exception>
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public WebSocketServer (int port, bool secure)
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: this (System.Net.IPAddress.Any, port, secure)
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{
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}
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/// <summary>
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/// Initializes a new instance of the <see cref="WebSocketServer"/> class that listens for
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/// incoming connection attempts on the specified <paramref name="address"/> and <paramref name="port"/>.
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/// </summary>
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/// <param name="address">
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/// A <see cref="System.Net.IPAddress"/> that represents the local IP address.
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/// </param>
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/// <param name="port">
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/// An <see cref="int"/> that contains a port number.
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/// </param>
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/// <exception cref="ArgumentNullException">
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/// <paramref name="address"/> is <see langword="null"/>.
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/// </exception>
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/// <exception cref="ArgumentOutOfRangeException">
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/// <paramref name="port"/> is not between 1 and 65535.
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/// </exception>
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/// <exception cref="ArgumentException">
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/// <paramref name="address"/> is not the local IP address.
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/// </exception>
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public WebSocketServer (System.Net.IPAddress address, int port)
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: this (address, port, port == 443 ? true : false)
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{
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}
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/// <summary>
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/// Initializes a new instance of the <see cref="WebSocketServer"/> class that listens for
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/// incoming connection attempts on the specified <paramref name="address"/>, <paramref name="port"/>
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/// and <paramref name="secure"/>.
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/// </summary>
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/// <param name="address">
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/// A <see cref="System.Net.IPAddress"/> that represents the local IP address.
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/// </param>
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/// <param name="port">
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/// An <see cref="int"/> that contains a port number.
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/// </param>
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/// <param name="secure">
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/// A <see cref="bool"/> that indicates providing a secure connection or not.
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/// (<c>true</c> indicates providing a secure connection.)
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/// </param>
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/// <exception cref="ArgumentNullException">
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/// <paramref name="address"/> is <see langword="null"/>.
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/// </exception>
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/// <exception cref="ArgumentOutOfRangeException">
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/// <paramref name="port"/> is not between 1 and 65535.
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/// </exception>
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/// <exception cref="ArgumentException">
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/// <para>
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/// <paramref name="address"/> is not the local IP address.
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/// </para>
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/// <para>
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/// -or-
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/// </para>
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/// <para>
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/// Pair of <paramref name="port"/> and <paramref name="secure"/> is invalid.
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/// </para>
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/// </exception>
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public WebSocketServer (System.Net.IPAddress address, int port, bool secure)
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{
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if (!address.IsLocal ())
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throw new ArgumentException (String.Format (
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"Must be the local IP address: {0}", address), "address");
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if (!port.IsPortNumber ())
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throw new ArgumentOutOfRangeException ("port", "Must be between 1 and 65535: " + port);
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if ((port == 80 && secure) || (port == 443 && !secure))
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throw new ArgumentException (String.Format (
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"Invalid pair of 'port' and 'secure': {0}, {1}", port, secure));
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_address = address;
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_port = port;
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_secure = secure;
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_uri = "/".ToUri ();
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init ();
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}
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#endregion
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#region Public Properties
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/// <summary>
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/// Gets the local IP address on which to listen for incoming connection attempts.
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/// </summary>
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/// <value>
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/// A <see cref="System.Net.IPAddress"/> that represents the local IP address.
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/// </value>
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public System.Net.IPAddress Address {
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get {
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return _address;
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}
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}
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/// <summary>
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/// Gets or sets the certificate used to authenticate the server on the secure connection.
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/// </summary>
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/// <value>
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/// A <see cref="X509Certificate2"/> used to authenticate the server.
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/// </value>
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public X509Certificate2 Certificate {
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get {
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return _cert;
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}
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set {
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if (_state == ServerState.START || _state == ServerState.SHUTDOWN)
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{
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_logger.Error (
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"The value of Certificate property cannot be changed because the server has already been started.");
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return;
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}
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_cert = value;
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}
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}
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/// <summary>
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/// Gets a value indicating whether the server has been started.
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/// </summary>
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/// <value>
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/// <c>true</c> if the server has been started; otherwise, <c>false</c>.
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/// </value>
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public bool IsListening {
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get {
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return _state == ServerState.START;
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}
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}
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/// <summary>
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/// Gets a value indicating whether the server provides secure connection.
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/// </summary>
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/// <value>
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/// <c>true</c> if the server provides secure connection; otherwise, <c>false</c>.
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/// </value>
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public bool IsSecure {
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get {
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return _secure;
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}
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}
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/// <summary>
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/// Gets or sets a value indicating whether the server cleans up the inactive sessions periodically.
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/// </summary>
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/// <value>
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/// <c>true</c> if the server cleans up the inactive sessions every 60 seconds;
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/// otherwise, <c>false</c>. The default value is <c>true</c>.
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/// </value>
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public bool KeepClean {
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get {
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return _serviceHosts.KeepClean;
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}
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set {
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_serviceHosts.KeepClean = value;
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}
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}
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/// <summary>
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/// Gets the logging functions.
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/// </summary>
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/// <remarks>
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/// The default logging level is the <see cref="LogLevel.ERROR"/>.
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/// If you want to change the current logging level, you set the <c>Log.Level</c> property
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/// to one of the <see cref="LogLevel"/> values which you want.
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/// </remarks>
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/// <value>
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/// A <see cref="Logger"/> that provides the logging functions.
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/// </value>
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public Logger Log {
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get {
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return _logger;
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}
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}
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/// <summary>
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/// Gets the port on which to listen for incoming connection attempts.
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/// </summary>
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/// <value>
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/// An <see cref="int"/> that contains a port number.
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/// </value>
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public int Port {
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get {
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return _port;
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}
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}
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/// <summary>
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/// Gets the functions for the WebSocket services provided by the server.
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/// </summary>
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/// <value>
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/// A <see cref="WebSocketServiceHostManager"/> that manages the WebSocket services.
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/// </value>
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public WebSocketServiceHostManager WebSocketServices {
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get {
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return _serviceHosts;
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}
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}
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#endregion
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#region Private Methods
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private void abort ()
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{
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lock (_sync)
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{
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if (!IsListening)
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return;
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_state = ServerState.SHUTDOWN;
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}
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_listener.Stop ();
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_serviceHosts.Stop (
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((ushort) CloseStatusCode.SERVER_ERROR).ToByteArrayInternally (ByteOrder.BIG), true);
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_state = ServerState.STOP;
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}
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private void acceptWebSocket (TcpListenerWebSocketContext context)
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{
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var websocket = context.WebSocket;
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websocket.Log = _logger;
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var path = context.Path;
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WebSocketServiceHost host;
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if (path == null || !_serviceHosts.TryGetServiceHostInternally (path, out host))
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{
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websocket.Close (HttpStatusCode.NotImplemented);
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return;
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}
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if (_uri.IsAbsoluteUri)
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websocket.Url = new Uri (_uri, path);
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host.StartSession (context);
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}
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private string checkIfCertExists ()
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{
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return _secure && _cert == null
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? "The secure connection requires a server certificate."
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: null;
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}
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private void init ()
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{
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_listener = new TcpListener (_address, _port);
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_logger = new Logger ();
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_serviceHosts = new WebSocketServiceHostManager (_logger);
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_state = ServerState.READY;
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_sync = new object ();
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}
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private void processRequestAsync (TcpClient client)
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{
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WaitCallback callback = state =>
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{
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try {
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acceptWebSocket (client.GetWebSocketContext (_secure, _cert));
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}
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catch (Exception ex)
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{
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_logger.Fatal (ex.ToString ());
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client.Close ();
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}
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};
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ThreadPool.QueueUserWorkItem (callback);
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}
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private void receiveRequest ()
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{
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while (true)
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{
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try {
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processRequestAsync (_listener.AcceptTcpClient ());
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}
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catch (SocketException ex) {
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_logger.Warn (String.Format ("Receiving has been stopped.\nreason: {0}.", ex.Message));
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break;
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}
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catch (Exception ex) {
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_logger.Fatal (ex.ToString ());
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break;
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}
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}
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if (IsListening)
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abort ();
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}
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private void startReceiveRequestThread ()
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{
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_receiveRequestThread = new Thread (new ThreadStart (receiveRequest));
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_receiveRequestThread.IsBackground = true;
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_receiveRequestThread.Start ();
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}
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private void stopListener (int timeOut)
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{
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_listener.Stop ();
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_receiveRequestThread.Join (timeOut);
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}
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private static bool tryCreateUri (string uriString, out Uri result, out string message)
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{
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if (!uriString.TryCreateWebSocketUri (out result, out message))
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return false;
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if (result.PathAndQuery != "/")
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{
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result = null;
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message = "Must not contain the path or query component: " + uriString;
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return false;
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}
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return true;
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}
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#endregion
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#region Public Methods
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/// <summary>
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/// Adds the specified typed WebSocket service with the specified <paramref name="servicePath"/>.
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/// </summary>
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/// <remarks>
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/// This method converts <paramref name="servicePath"/> to URL-decoded string and
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/// removes <c>'/'</c> from tail end of <paramref name="servicePath"/>.
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/// </remarks>
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/// <param name="servicePath">
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/// A <see cref="string"/> that contains an absolute path to the WebSocket service.
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/// </param>
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/// <typeparam name="TWithNew">
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/// The type of the WebSocket service. The TWithNew must inherit the <see cref="WebSocketService"/>
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/// class and must have a public parameterless constructor.
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/// </typeparam>
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public void AddWebSocketService<TWithNew> (string servicePath)
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where TWithNew : WebSocketService, new ()
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{
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AddWebSocketService<TWithNew> (servicePath, () => new TWithNew ());
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}
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/// <summary>
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/// Adds the specified typed WebSocket service with the specified <paramref name="servicePath"/> and
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/// <paramref name="serviceConstructor"/>.
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/// </summary>
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/// <remarks>
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/// <para>
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/// This method converts <paramref name="servicePath"/> to URL-decoded string and
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/// removes <c>'/'</c> from tail end of <paramref name="servicePath"/>.
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/// </para>
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/// <para>
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/// <paramref name="serviceConstructor"/> returns a initialized specified typed WebSocket service
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/// instance.
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/// </para>
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/// </remarks>
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/// <param name="servicePath">
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/// A <see cref="string"/> that contains an absolute path to the WebSocket service.
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/// </param>
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/// <param name="serviceConstructor">
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/// A Func<T> delegate that references the method used to initialize a new WebSocket service
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/// instance (a new WebSocket session).
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/// </param>
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/// <typeparam name="T">
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/// The type of the WebSocket service. The T must inherit the <see cref="WebSocketService"/> class.
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/// </typeparam>
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public void AddWebSocketService<T> (string servicePath, Func<T> serviceConstructor)
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where T : WebSocketService
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{
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var msg = servicePath.CheckIfValidServicePath () ??
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(serviceConstructor == null ? "'serviceConstructor' must not be null." : null);
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if (msg != null)
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{
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_logger.Error (String.Format ("{0}\nservice path: {1}", msg, servicePath ?? ""));
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return;
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}
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var host = new WebSocketServiceHost<T> (servicePath, serviceConstructor, _logger);
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if (!KeepClean)
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host.KeepClean = false;
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_serviceHosts.Add (host.ServicePath, host);
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}
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/// <summary>
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/// Removes the WebSocket service with the specified <paramref name="servicePath"/>.
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/// </summary>
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/// <remarks>
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/// This method converts <paramref name="servicePath"/> to URL-decoded string and
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/// removes <c>'/'</c> from tail end of <paramref name="servicePath"/>.
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/// </remarks>
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/// <returns>
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/// <c>true</c> if the WebSocket service is successfully found and removed; otherwise, <c>false</c>.
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/// </returns>
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/// <param name="servicePath">
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/// A <see cref="string"/> that contains an absolute path to the WebSocket service to find.
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/// </param>
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public bool RemoveWebSocketService (string servicePath)
|
|
{
|
|
var msg = servicePath.CheckIfValidServicePath ();
|
|
if (msg != null)
|
|
{
|
|
_logger.Error (String.Format ("{0}\nservice path: {1}", msg, servicePath ?? ""));
|
|
return false;
|
|
}
|
|
|
|
return _serviceHosts.Remove (servicePath);
|
|
}
|
|
|
|
/// <summary>
|
|
/// Starts to receive the WebSocket connection requests.
|
|
/// </summary>
|
|
public void Start ()
|
|
{
|
|
lock (_sync)
|
|
{
|
|
var msg = _state.CheckIfStopped () ?? checkIfCertExists ();
|
|
if (msg != null)
|
|
{
|
|
_logger.Error (String.Format ("{0}\nstate: {1}\nsecure: {2}", msg, _state, _secure));
|
|
return;
|
|
}
|
|
|
|
_serviceHosts.Start ();
|
|
_listener.Start ();
|
|
startReceiveRequestThread ();
|
|
|
|
_state = ServerState.START;
|
|
}
|
|
}
|
|
|
|
/// <summary>
|
|
/// Stops receiving the WebSocket connection requests.
|
|
/// </summary>
|
|
public void Stop ()
|
|
{
|
|
lock (_sync)
|
|
{
|
|
var msg = _state.CheckIfStarted ();
|
|
if (msg != null)
|
|
{
|
|
_logger.Error (String.Format ("{0}\nstate: {1}", msg, _state));
|
|
return;
|
|
}
|
|
|
|
_state = ServerState.SHUTDOWN;
|
|
}
|
|
|
|
stopListener (5000);
|
|
_serviceHosts.Stop (new byte []{}, true);
|
|
|
|
_state = ServerState.STOP;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Stops receiving the WebSocket connection requests with the specified <see cref="ushort"/> and
|
|
/// <see cref="string"/>.
|
|
/// </summary>
|
|
/// <param name="code">
|
|
/// A <see cref="ushort"/> that contains a status code indicating the reason for stop.
|
|
/// </param>
|
|
/// <param name="reason">
|
|
/// A <see cref="string"/> that contains the reason for stop.
|
|
/// </param>
|
|
public void Stop (ushort code, string reason)
|
|
{
|
|
byte [] data = null;
|
|
lock (_sync)
|
|
{
|
|
var msg = _state.CheckIfStarted () ??
|
|
code.CheckIfValidCloseStatusCode () ??
|
|
(data = code.Append (reason)).CheckIfValidCloseData ();
|
|
|
|
if (msg != null)
|
|
{
|
|
_logger.Error (String.Format (
|
|
"{0}\nstate: {1}\ncode: {2}\nreason: {3}", msg, _state, code, reason));
|
|
|
|
return;
|
|
}
|
|
|
|
_state = ServerState.SHUTDOWN;
|
|
}
|
|
|
|
stopListener (5000);
|
|
_serviceHosts.Stop (data, !code.IsReserved ());
|
|
|
|
_state = ServerState.STOP;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Stops receiving the WebSocket connection requests with the specified <see cref="CloseStatusCode"/>
|
|
/// and <see cref="string"/>.
|
|
/// </summary>
|
|
/// <param name="code">
|
|
/// One of the <see cref="CloseStatusCode"/> values that represent the status codes indicating
|
|
/// the reasons for stop.
|
|
/// </param>
|
|
/// <param name="reason">
|
|
/// A <see cref="string"/> that contains the reason for stop.
|
|
/// </param>
|
|
public void Stop (CloseStatusCode code, string reason)
|
|
{
|
|
byte [] data = null;
|
|
lock (_sync)
|
|
{
|
|
var msg = _state.CheckIfStarted () ??
|
|
(data = ((ushort) code).Append (reason)).CheckIfValidCloseData ();
|
|
|
|
if (msg != null)
|
|
{
|
|
_logger.Error (String.Format ("{0}\nstate: {1}\nreason: {2}", msg, _state, reason));
|
|
return;
|
|
}
|
|
|
|
_state = ServerState.SHUTDOWN;
|
|
}
|
|
|
|
stopListener (5000);
|
|
_serviceHosts.Stop (data, !code.IsReserved ());
|
|
|
|
_state = ServerState.STOP;
|
|
}
|
|
|
|
#endregion
|
|
}
|
|
}
|