SparkleShare/SparkleLib/SparkleListenerTcp.cs

//   SparkleShare, a collaboration and sharing tool.
//   Copyright (C) 2010  Hylke Bons <hylkebons@gmail.com>
//
//   This program is free software: you can redistribute it and/or modify
//   it under the terms of the GNU General Public License as published by
//   the Free Software Foundation, either version 3 of the License, or
//   (at your option) any later version.
//
//   This program is distributed in the hope that it will be useful,
//   but WITHOUT ANY WARRANTY; without even the implied warranty of
//   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
//   GNU General Public License for more details.
//
//   You should have received a copy of the GNU General Public License
//   along with this program. If not, see <http://www.gnu.org/licenses/>.


using System;
using System.Text;
using System.Threading;
using System.Net.Sockets;
using System.Security.Cryptography;

namespace SparkleLib {

    public class SparkleListenerTcp : SparkleListenerBase {

        private Thread thread;
        private Socket socket;

        public SparkleListenerTcp (Uri server, string folder_identifier) :
            base (server, folder_identifier)
        {
            base.channels.Add (folder_identifier);
            this.socket = new Socket (AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
/*
            this.client.OnConnected += delegate {
                base.is_connecting = false;
                OnConnected ();
            };

            this.client.OnDisconnected += delegate {
                base.is_connecting = false;
                OnDisconnected ();
            };

            this.client.OnError += delegate {
                base.is_connecting = false;
                OnDisconnected ();
            };

            this..OnChannelMessage += delegate (object o, IrcEventArgs args) {
                string message = args.Data.Message.Trim ();
                string folder_id = args.Data.Channel.Substring (1); // remove the starting hash
                OnAnnouncement (new SparkleAnnouncement (folder_id, message));
            };*/
        }


        public override bool IsConnected {
            get {
              //return this.client.IsConnected;
              return true;
            }
        }


        // Starts a new thread and listens to the channel
        public override void Connect ()
        {
            SparkleHelpers.DebugInfo ("ListenerTcp", "Connecting to " + Server.Host);

            base.is_connecting = true;

            this.thread = new Thread (
                new ThreadStart (delegate {
                    try {

                        // Connect and subscribe to the channel
                        int port = Server.Port;
                        if (port < 0) port = 9999;
                        this.socket.Connect (Server.Host, port);
                        base.is_connecting = false;

                        foreach (string channel in base.channels) {
                            SparkleHelpers.DebugInfo ("ListenerTcp", "Subscribing to channel " + channel);

                            byte [] message = Encoding.UTF8.GetBytes (
                                "{\"folder\": \"" + channel + "\", \"command\": \"subscribe\"}");
                            this.socket.Send (message);
                        }

                        byte [] bytes = new byte [4096];

                        // List to the channels, this blocks the thread
                        while (this.socket.Connected) {
                            this.socket.Receive (bytes);
                            if (bytes != null && bytes.Length > 0) {
                                Console.WriteLine (Encoding.UTF8.GetString (bytes));

                                string received_message = bytes.ToString ().Trim ();
                                string folder_id = ""; // TODO: parse message, use XML
                                OnAnnouncement (new SparkleAnnouncement (folder_id, received_message));
                            }
                        }

                        // Disconnect when we time out
                        this.socket.Close ();

                    } catch (SocketException e) {
                        SparkleHelpers.DebugInfo ("ListenerTcp", "Could not connect to " + Server + ": " + e.Message);
                    }
                })
            );

            this.thread.Start ();
        }


        public override void AlsoListenTo (string folder_identifier)
        {
            string channel = folder_identifier;
            if (!base.channels.Contains (channel)) {
                base.channels.Add (channel);

                if (IsConnected) {
                    SparkleHelpers.DebugInfo ("ListenerTcp", "Subscribing to channel " + channel);

                    byte [] message = Encoding.UTF8.GetBytes (
                        "{\"folder\": \"" + channel + "\", \"command\": \"subscribe\"}");
                    this.socket.Send (message);
                }
            }
        }


        public override void Announce (SparkleAnnouncement announcement)
        {
            string channel = announcement.FolderIdentifier;
            byte [] message = Encoding.UTF8.GetBytes (
               "{\"folder\": \"" + channel + "\", \"command\": \"publish\"}");
            this.socket.Send (message);

            // Also announce to ourselves for debugging purposes
            // base.OnAnnouncement (announcement);
        }


        public override void Dispose ()
        {
            this.thread.Abort ();
            this.thread.Join ();
            base.Dispose ();
        }
    }
}