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// 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.Net.Sockets;
using System.Text;
using System.Threading;
namespace SparkleLib {
public class SparkleListenerTcp : SparkleListenerBase {
private Socket socket;
private Thread thread;
private bool is_connected = false;
private bool is_connecting = false;
private DateTime last_ping = DateTime.Now;
public SparkleListenerTcp (Uri server, string folder_identifier) : base (server, folder_identifier)
{
}
public override bool IsConnected {
get {
return this.is_connected;
}
}
public override bool IsConnecting {
get {
return this.is_connecting;
}
}
// Starts a new thread and listens to the channel
public override void Connect ()
{
this.is_connecting = true;
this.thread = new Thread (() => {
int port = Server.Port;
if (port < 0)
port = 443;
try {
this.socket = new Socket (AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp) {
ReceiveTimeout = 5 * 1000,
SendTimeout = 5 * 1000
};
// Try to connect to the server
this.socket.Connect (Server.Host, port);
this.is_connecting = false;
this.is_connected = true;
OnConnected ();
} catch (SocketException e) {
this.is_connected = false;
this.is_connecting = false;
if (this.socket != null)
this.socket.Close ();
OnDisconnected (e.Message);
return;
}
byte [] bytes = new byte [4096];
int bytes_read = 0;
this.last_ping = DateTime.Now;
// Wait for messages
while (this.is_connected) {
try {
// This blocks the thread
int i = 0;
int timeout = 300;
while (this.socket.Available < 1) {
try {
// We've timed out, let's ping the server to
// see if the connection is still up
if (i == timeout) {
SparkleLogger.LogInfo ("ListenerTcp",
"Pinging " + Server);
byte [] ping_bytes = Encoding.UTF8.GetBytes ("ping\n");
byte [] pong_bytes = new byte [4096];
this.socket.Send (ping_bytes);
if (this.socket.Receive (pong_bytes) < 1)
// 10057 means "Socket is not connected"
throw new SocketException (10057);
SparkleLogger.LogInfo ("ListenerTcp", "Received pong from " + Server);
i = 0;
this.last_ping = DateTime.Now;
} else {
// Check when the last ping occured. If it's
// significantly longer than our regular interval the
// system likely woke up from sleep and we want to
// simulate a disconnect
int sleepiness = DateTime.Compare (
this.last_ping.AddMilliseconds (timeout * 1000 * 1.2),
DateTime.Now
);
if (sleepiness <= 0) {
SparkleLogger.LogInfo ("ListenerTcp", "System woke up from sleep");
// 10057 means "Socket is not connected"
throw new SocketException (10057);
}
}
// The ping failed: disconnect completely
} catch (SocketException e) {
this.is_connected = false;
this.is_connecting = false;
if (this.socket != null) {
this.socket.Close ();
this.socket = null;
}
OnDisconnected ("Ping timeout: " + e.Message);
return;
}
Thread.Sleep (1000);
i++;
}
} catch (Exception) {
return;
}
if (this.socket.Available > 0)
bytes_read = this.socket.Receive (bytes);
// Parse the received message
if (bytes_read > 0) {
string received = Encoding.UTF8.GetString (bytes);
string line = received.Substring (0, received.IndexOf ("\n"));
if (!line.Contains ("!"))
continue;
string folder_identifier = line.Substring (0, line.IndexOf ("!"));
string message = CleanMessage (line.Substring (line.IndexOf ("!") + 1));
// We have a message!
if (!folder_identifier.Equals ("debug") && !String.IsNullOrEmpty (message))
OnAnnouncement (new SparkleAnnouncement (folder_identifier, message));
}
}
});
this.thread.Start ();
}
protected override void AlsoListenToInternal (string folder_identifier)
{
string to_send = "subscribe " + folder_identifier + "\n";
try {
this.socket.Send (Encoding.UTF8.GetBytes (to_send));
this.last_ping = DateTime.Now;
} catch (Exception e) {
this.is_connected = false;
this.is_connecting = false;
OnDisconnected (e.Message);
}
}
protected override void AnnounceInternal (SparkleAnnouncement announcement)
{
string to_send = "announce " + announcement.FolderIdentifier + " " + announcement.Message + "\n";
try {
if (this.socket != null)
this.socket.Send (Encoding.UTF8.GetBytes (to_send));
this.last_ping = DateTime.Now;
} catch (Exception e) {
this.is_connected = false;
this.is_connecting = false;
OnDisconnected (e.Message);
}
}
public override void Dispose ()
{
this.thread.Abort ();
this.thread.Join ();
if (this.socket != null)
this.socket.Close ();
base.Dispose ();
}
private string CleanMessage (string message)
{
message = message.Replace ("\n", "");
message = message.Replace ("\0", "");
return message.Trim ();
}
}
}
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