#region MIT License
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/**
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* WebSocketServerBase.cs
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*
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* The MIT License
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*
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* Copyright (c) 2012 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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using System;
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using System.Diagnostics;
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using System.Net;
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using System.Net.Sockets;
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using System.Threading;
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namespace WebSocketSharp.Server
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{
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public abstract class WebSocketServerBase
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{
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#region Fields
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private Thread _acceptClientThread;
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private IPAddress _address;
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private bool _isSecure;
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private bool _isSelfHost;
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private int _port;
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private TcpListener _tcpListener;
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private Uri _uri;
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#endregion
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#region Constructors
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protected WebSocketServerBase()
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{
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_isSelfHost = false;
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}
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protected WebSocketServerBase(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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Uri uri;
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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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init(uri);
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}
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protected WebSocketServerBase(IPAddress address, int port, string absPath, bool secure)
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{
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if (address == null)
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throw new ArgumentNullException("address");
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if (absPath == null)
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throw new ArgumentNullException("absPath");
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string msg;
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if (!Ext.IsValidAbsolutePath(absPath, out msg))
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throw new ArgumentException(msg, "absPath");
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if ((port == 80 && secure) ||
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(port == 443 && !secure))
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{
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msg = String.Format(
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"Invalid pair of 'port' and 'secure': {0}, {1}", port, secure);
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throw new ArgumentException(msg);
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}
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_address = address;
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_port = port > 0
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? port
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: secure ? 443 : 80;
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_uri = Ext.ToUri(absPath);
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_isSecure = secure;
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init();
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}
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#endregion
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#region Protected Property
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protected Uri BaseUri
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{
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get
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{
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return _uri;
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}
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set
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{
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_uri = value;
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}
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}
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#endregion
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#region Public Properties
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public IPAddress Address
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{
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get
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{
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return _address;
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}
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}
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public bool IsSecure
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{
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get
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{
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return _isSecure;
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}
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}
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public bool IsSelfHost
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{
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get
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{
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return _isSelfHost;
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}
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}
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public int Port
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{
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get
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{
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return _port;
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}
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}
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#endregion
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#region Events
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public event EventHandler<ErrorEventArgs> OnError;
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#endregion
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#region Private Methods
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private void acceptClient()
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{
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while (true)
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{
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try
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{
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var client = _tcpListener.AcceptTcpClient();
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acceptSocketAsync(client);
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}
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catch (SocketException)
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{
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// TcpListener has been stopped.
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break;
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}
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catch (Exception ex)
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{
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onError(ex.Message);
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break;
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}
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}
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}
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private void acceptSocketAsync(TcpClient client)
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{
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WaitCallback acceptSocketCb = (state) =>
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{
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try
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{
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AcceptWebSocket(client);
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}
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catch (Exception ex)
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{
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onError(ex.Message);
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}
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};
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ThreadPool.QueueUserWorkItem(acceptSocketCb);
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}
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private void init()
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{
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_tcpListener = new TcpListener(_address, _port);
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_isSelfHost = true;
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}
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private void init(Uri uri)
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{
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var scheme = uri.Scheme;
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var host = uri.DnsSafeHost;
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var port = uri.Port;
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var addrs = Dns.GetHostAddresses(host);
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_uri = uri;
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_address = addrs[0];
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_isSecure = scheme == "wss" ? true : false;
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_port = port > 0
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? port
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: _isSecure ? 443 : 80;
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init();
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}
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private void onError(string message)
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{
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#if DEBUG
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var callerFrame = new StackFrame(1);
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var caller = callerFrame.GetMethod();
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Console.WriteLine("WSSV: Error@{0}: {1}", caller.Name, message);
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#endif
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Ext.Emit(OnError, this, new ErrorEventArgs(message));
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}
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private void startAcceptClientThread()
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{
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_acceptClientThread = new Thread(new ThreadStart(acceptClient));
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_acceptClientThread.IsBackground = true;
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_acceptClientThread.Start();
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}
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private bool tryCreateUri(string uriString, out Uri result, out string message)
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{
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if (!Ext.TryCreateWebSocketUri(uriString, out result, out message))
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return false;
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if (!Ext.IsNullOrEmpty(result.Query))
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{
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result = null;
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message = "Must not contain the 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 Protected Methods
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protected abstract void AcceptWebSocket(TcpClient client);
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protected virtual void Error(string message)
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{
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onError(message);
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}
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#endregion
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#region Public Methods
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public virtual void Start()
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{
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if (!_isSelfHost)
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return;
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_tcpListener.Start();
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startAcceptClientThread();
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}
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public virtual void Stop()
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{
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if (!_isSelfHost)
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return;
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_tcpListener.Stop();
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_acceptClientThread.Join(5 * 1000);
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}
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#endregion
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}
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}
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