/// <summary>
/// Process a control message received from the WM.
/// </summary>
private void ProcessWmControlMsg(TcmControlMsg msg)
{
Debug.Assert(msg is TcmConnectionRequest);
TcmConnectionRequest req = (TcmConnectionRequest)msg;
// Handle new KAS to connect.
if (req.ConnectFlag)
{
Debug.Assert(!m_kasTree.ContainsKey(req.KasID));
m_kasTree[req.KasID] = new TbxAppServer(req.KasID);
}
// Disconnect the KAS, if we didn't disconnect it yet.
else
{
if (!m_kasTree.ContainsKey(req.KasID))
{
return;
}
TbxAppServer kas = m_kasTree[req.KasID];
if (kas.ConnStatus == TcmAppServerConStatus.Disconnected)
{
return;
}
HandleDisconnectedKas(kas, null);
}
}
/// <summary>
/// Handle a message received from a KAS.
/// </summary>
private void ProcessIncomingAppServerMessage(TbxAppServer k, AnpMsg msg)
{
if (k.ConnStatus == TcmAppServerConStatus.RoleReply)
{
if (msg.Type == KAnpType.KANP_RES_FAIL_MUST_UPGRADE)
{
throw new Exception("The KWM is too old, it needs to be upgraded to communicate with " +
k.KasID.Host + " which has protocol version " + msg.Minor);
}
else if (msg.Type != KAnpType.KANP_RES_OK)
{
throw new Exception(msg.Elements[1].String);
}
else if (msg.Minor < KAnp.LastCompMinor)
{
throw new Exception("The KCD at " + k.KasID.Host +
" is too old and needs to be upgraded.");
}
else
{
HandleConnectedAppServer(k, Math.Min(msg.Minor, KAnp.Minor));
}
}
else
{
m_toWmAnpMsgList.Add(new TcmAnpMsg(msg, k.KasID));
}
}
/// <summary>
/// Analyse the result of the select() call for the specified KAS.
/// </summary>
private void UpdateStateAfterSelect(TbxAppServer k, SelectSockets selectSockets)
{
try
{
k.CheckNoMessageReceivedInvariant();
// We have nothing to do if we don't have an established TCP
// connection.
if (k.ConnStatus != TcmAppServerConStatus.Connected &&
k.ConnStatus != TcmAppServerConStatus.RoleReply)
{
return;
}
// Perform transfers only if the socket is ready.
Debug.Assert(k.Tunnel.Sock != null);
if (!selectSockets.InReadOrWrite(k.Tunnel.Sock))
{
return;
}
// Do up to 20 transfers (the limit exists for quenching purposes).
for (int i = 0; i < 20; i++)
{
// Send a message if possible.
k.SendNextQueuedMsgIfNeeded();
// Remember if we are sending a message.
bool sendingFlag = k.Tunnel.IsSendingMessage();
// Do transfers.
k.Tunnel.DoXfer();
// Stop if no message has been received and no message has been sent.
if (!k.Tunnel.HasReceivedMessage() &&
(!sendingFlag || k.Tunnel.IsSendingMessage()))
{
break;
}
// Process the message received.
if (k.Tunnel.HasReceivedMessage())
{
ProcessIncomingAppServerMessage(k, k.Tunnel.GetMsg());
}
}
k.CheckNoMessageReceivedInvariant();
}
catch (Exception ex)
{
HandleDisconnectedKas(k, ex);
}
}
/// <summary>
/// Mark the KAS as disconnected, add a control message for the KAS in
/// the control message list and add the KAS to the disconnected list.
/// </summary>
private void HandleDisconnectedKas(TbxAppServer k, Exception ex)
{
if (ex != null)
{
Logging.Log(2, "KAS " + k.KasID.Host + " exception: " + ex.Message);
}
if (k.Tunnel != null)
{
k.Tunnel.Disconnect();
}
k.ConnStatus = TcmAppServerConStatus.Disconnected;
k.Ex = ex;
m_toWmControlMsgList.Add(new TcmDisconnectionNotice(k.KasID, k.Ex));
m_disconnectedList.Add(k);
}
/// <summary>
/// Process an ANP message received from the WM.
/// </summary>
private void ProcessWmAnpMsg(TcmAnpMsg msg)
{
// Ignore messages not destined to connected KASes.
if (!m_kasTree.ContainsKey(msg.KasID))
{
return;
}
TbxAppServer kas = m_kasTree[msg.KasID];
if (kas.ConnStatus != TcmAppServerConStatus.Connected)
{
return;
}
// Enqueue the message.
kas.SendQueue.Enqueue(msg.Msg);
}
/// <summary>
/// Add the socket of the KAS in the select sets as needed and manage
/// ktlstunnel.exe processes.
/// </summary>
private void PrepareStateForSelect(TbxAppServer k, SelectSockets selectSockets, bool quenchFlag,
ref bool connWatchFlag)
{
// Note: the KAS should never have received a message when this function
// is called. The function UpdateStateAfterSelect() is responsible for
// doing all the transfers and handling any message received after these
// transfers.
try
{
k.CheckNoMessageReceivedInvariant();
if (k.ConnStatus == TcmAppServerConStatus.Scheduled)
{
// Start ktlstunnel.exe.
k.ConnStatus = TcmAppServerConStatus.Connecting;
k.Tunnel.BeginConnect();
}
if (k.ConnStatus == TcmAppServerConStatus.Connecting)
{
// The TCP connection is now open.
if (k.Tunnel.CheckConnect(0))
{
// Send the select role command.
k.SendSelectRoleMsg();
// Wait for the reply to arrive.
k.ConnStatus = TcmAppServerConStatus.RoleReply;
}
// Wait for the TCP connection to be established. We busy wait
// to monitor the status of ktlstunnel.exe regularly, to detect
// the case where the connection fails.
else
{
connWatchFlag = true;
}
}
if (k.ConnStatus == TcmAppServerConStatus.RoleReply)
{
// Wait for the reply to arrive.
if (!quenchFlag)
{
k.Tunnel.UpdateSelect(selectSockets);
}
}
if (k.ConnStatus == TcmAppServerConStatus.Connected)
{
// Send the next message, if possible.
k.SendNextQueuedMsgIfNeeded();
if (!quenchFlag)
{
k.Tunnel.UpdateSelect(selectSockets);
}
}
k.CheckNoMessageReceivedInvariant();
}
catch (Exception ex)
{
HandleDisconnectedKas(k, ex);
}
}
/// <summary>
/// Mark the KAS as connected and add a control message for the KAS in
/// the control message list.
/// </summary>
private void HandleConnectedAppServer(TbxAppServer k, UInt32 minor)
{
k.ConnStatus = TcmAppServerConStatus.Connected;
m_toWmControlMsgList.Add(new TcmConnectionNotice(k.KasID, minor));
}