private void OnReceive(IAsyncResult ar)
{
lock (this)
{
int length;
try
{
if (_socket == null)
{
return;
}
length = _socket.EndReceive(ar);
}
catch (Exception)
{
return;
}
try
{
var stream = new MemoryStream(_buffer, 0, length, false, true);
Announcement announcement = ReadAnnouncement(stream);
if (announcement.Type == Announcement.MessageType.Announcement)
{
SapClient.OnSessionAnnounce(this, announcement);
}
else
{
announcement.Decompress();
string origin = Encoding.UTF8.GetString(announcement.Payload.Array, announcement.Payload.Offset + 2, announcement.Payload.Count - 4);
SapClient.OnSessionDelete(this, Origin.Parse(origin));
}
}
catch (Exception e)
{
SapClient.OnException(e);
}
StartReceive();
}
}
internal void OnSessionAnnounce(NetworkInterfaceHandler interfaceHandler, Announcement announcement)
{
lock (_sessionData)
{
AnnouncementIdentifier id = new AnnouncementIdentifier(interfaceHandler.NetworkInterface, announcement);
SessionData sessionData = null;
bool knownAnnouncement = _announcements.TryGetValue(id, out sessionData);
if (!knownAnnouncement)
{
announcement.Decompress();
Stream stream = new MemoryStream(announcement.Payload.Array, announcement.Payload.Offset, announcement.Payload.Count);
SessionDescription description = SessionDescription.Load(stream);
description.SetReadOnly();
SdpSession session = new SdpSession(description, interfaceHandler.NetworkInterface);
SessionAnnouncement sessionAnnouncement = null;
if (_sessionData.TryGetValue(session, out sessionData))
{
sessionAnnouncement = sessionData.Session;
}
if (sessionData != null)
{
if (description.IsUpdateOf(sessionAnnouncement.SessionDescription))
{
sessionAnnouncement = new SessionAnnouncement(description, interfaceHandler.NetworkInterface);
SessionAnnouncement oldAnnouncement = sessionData.Session;
sessionData.Session = sessionAnnouncement;
_announcements.Remove(sessionData.Id);
sessionData.Id = id;
SynchronizationContextPost(o =>
{
lock (Sessions)
{
Sessions.Replace(oldAnnouncement, sessionAnnouncement);
}
});
}
}
else
{
sessionAnnouncement = new SessionAnnouncement(description, interfaceHandler.NetworkInterface);
sessionData = new SessionData()
{
Session = sessionAnnouncement,
Timer = new Timer(OnTimeOut, session, System.Threading.Timeout.Infinite, System.Threading.Timeout.Infinite),
Id = id
};
_sessionData.Add(session, sessionData);
_announcements.Add(id, sessionData);
SynchronizationContextPost(o =>
{
lock (Sessions)
{
Sessions.Add(sessionAnnouncement);
}
});
}
}
sessionData.TimeOutTime = DateTime.Now + DefaultTimeOut;
sessionData.Timer.Change(DefaultTimeOut, TimeSpan.FromMilliseconds(-1));
}
}