private void AddSession(ISession session, Peer peer)
{
bool newSessionIsIn = session.Direction == ConnectionDirection.In;
bool newSessionIsOut = !newSessionIsIn;
bool peerIsDisconnected = PeerIsDisconnected(peer);
if (peerIsDisconnected)
{
if (newSessionIsIn)
{
peer.InSession = session;
}
else
{
peer.OutSession = session;
}
}
else
{
bool peerHasAnOpenInSession = !peer.InSession?.IsClosing ?? false;
bool peerHasAnOpenOutSession = !peer.OutSession?.IsClosing ?? false;
if (newSessionIsIn && peerHasAnOpenInSession || newSessionIsOut && peerHasAnOpenOutSession)
{
if (_logger.IsDebug)
{
_logger.Debug($"Disconnecting a {session} - already connected");
}
session.InitiateDisconnect(DisconnectReason.AlreadyConnected, "same");
}
else if (newSessionIsIn && peerHasAnOpenOutSession || newSessionIsOut && peerHasAnOpenInSession)
{
// disconnecting the new session as it lost to the existing one
ConnectionDirection directionToKeep = ChooseDirectionToKeep(session.RemoteNodeId);
if (session.Direction != directionToKeep)
{
if (_logger.IsDebug)
{
_logger.Debug($"Disconnecting a new {session} - {directionToKeep} session already connected");
}
session.InitiateDisconnect(DisconnectReason.AlreadyConnected, "same");
}
// replacing existing session with the new one as the new one won
else if (newSessionIsIn)
{
peer.InSession = session;
if (_logger.IsDebug)
{
_logger.Debug($"Disconnecting an existing {session} - {directionToKeep} session to replace");
}
peer.OutSession?.InitiateDisconnect(DisconnectReason.AlreadyConnected, "same");
}
else
{
peer.OutSession = session;
if (_logger.IsDebug)
{
_logger.Debug($"Disconnecting an existing {session} - {directionToKeep} session to replace");
}
peer.OutSession?.InitiateDisconnect(DisconnectReason.AlreadyConnected, "same");
}
}
}
AddActivePeer(peer.Node.Id, peer, newSessionIsIn ? "new IN session" : "new OUT session");
}
private static bool PeerIsDisconnected(Peer peer)
{
return((peer.InSession?.IsClosing ?? true) && (peer.OutSession?.IsClosing ?? true));
}
private static bool IsConnected(Peer peer)
{
return(!(peer.InSession?.IsClosing ?? true) || !(peer.OutSession?.IsClosing ?? true));
}