Allow central server to confirm registration

Also display this state in the server UI.

src/global.h

@@ -215,6 +215,13 @@ LED bar:      lbr
 // defines the minimum time a server must run to be a permanent server
 #define SERVLIST_TIME_PERMSERV_MINUTES   1440 // minutes, 1440 = 60 min * 24 h
 
+// registration response timeout
+#define REGISTER_SERVER_TIME_OUT_MS     500 // ms
+
+// defines the maximum number of times to retry server registration
+// when no response is received within the timeout (before reverting
+// to SERVLIST_REGIST_INTERV_MINUTES)
+#define REGISTER_SERVER_RETRY_LIMIT     5 // count
 
 // length of the moving average buffer for response time measurement
 #define TIME_MOV_AV_RESPONSE_SECONDS     30 // seconds

src/protocol.cpp

@@ -289,6 +289,7 @@ CONNECTION LESS MESSAGES
 
     note: does not have any data -> n = 0
 
+
 - PROTMESSID_CLM_CHANNEL_LEVEL_LIST: The channel level list
 
     +----------------------------------+
@@ -304,13 +305,32 @@ CONNECTION LESS MESSAGES
     where an odd number of clients is connected, there will be four unused
     upper bits in the final byte, containing 0xF (which is out of range)
 
-    the server may compute them message when any client has used
+    the server may compute the message when any client has used
     PROTMESSID_CLM_REQ_CHANNEL_LEVEL_LIST to opt in
 
-    the server may issue to message only to a client that has used
+    the server should issue the message only to a client that has used
     PROTMESSID_CLM_REQ_CHANNEL_LEVEL_LIST to opt in
 
 
+- PROTMESSID_CLM_REGISTER_SERVER_RESP: result of registration request
+
+    +---------------+
+    | 1 byte status |
+    +---------------+
+
+    - "status":
+      Values of ESvrRegResult:
+      0 - success
+      1 - failed due to central server list being full
+
+    Note: the central server may send this message in response to a
+          PROTMESSID_CLM_REGISTER_SERVER request.
+          Where not received, the registering server may only retry up to
+          five times for one registration request at 500ms intervals.
+          Beyond this, it should "ping" every 15 minutes
+          (standard re-registration timeout).
+
+
  ******************************************************************************
  *
  * This program is free software; you can redistribute it and/or modify it under
@@ -676,6 +696,10 @@ if ( rand() < ( RAND_MAX / 2 ) ) return false;
         case PROTMESSID_CLM_CHANNEL_LEVEL_LIST:
             bRet = EvaluateCLChannelLevelListMes ( InetAddr, vecbyMesBodyData );
             break;
+
+        case PROTMESSID_CLM_REGISTER_SERVER_RESP:
+            bRet = EvaluateCLRegisterServerResp ( InetAddr, vecbyMesBodyData );
+            break;
         }
     }
     else
@@ -2090,6 +2114,39 @@ bool CProtocol::EvaluateCLChannelLevelListMes  ( const CHostAddress&     InetAdd
     return false; // no error
 }
 
+void CProtocol::CreateCLRegisterServerResp  ( const CHostAddress& InetAddr,
+                                              const ESvrRegResult eResult )
+{
+    int              iPos = 0; // init position pointer
+    CVector<uint8_t> vecData( 1 );
+
+    PutValOnStream ( vecData, iPos,
+        static_cast<uint32_t> ( eResult ), 1 );
+
+    CreateAndImmSendConLessMessage ( PROTMESSID_CLM_REGISTER_SERVER_RESP,
+                                     vecData,
+                                     InetAddr );
+}
+
+bool CProtocol::EvaluateCLRegisterServerResp ( const CHostAddress&     InetAddr,
+                                               const CVector<uint8_t>& vecData )
+{
+    int       iPos     = 0; // init position pointer
+    const int iDataLen = vecData.Size();
+
+    if ( iDataLen != 1 )
+    {
+        return true;
+    }
+
+    ESvrRegResult eResult = static_cast<ESvrRegResult> (
+        GetValFromStream ( vecData, iPos, 1 ) );
+
+    // invoke message action
+    emit CLRegisterServerResp ( InetAddr,  eResult );
+
+    return false; // no error
+}
 
 /******************************************************************************\
 * Message generation and parsing                                               *

src/protocol.h

@@ -73,6 +73,7 @@
 #define PROTMESSID_CLM_CONN_CLIENTS_LIST      1013 // channel infos for connected clients
 #define PROTMESSID_CLM_REQ_CONN_CLIENTS_LIST  1014 // request the connected clients list
 #define PROTMESSID_CLM_CHANNEL_LEVEL_LIST     1015 // channel level list
+#define PROTMESSID_CLM_REGISTER_SERVER_RESP   1016 // status of server registration request
 
 // lengths of message as defined in protocol.cpp file
 #define MESS_HEADER_LENGTH_BYTE         7 // TAG (2), ID (2), cnt (1), length (2)
@@ -130,6 +131,8 @@ public:
     void CreateCLChannelLevelListMes   ( const CHostAddress&      InetAddr,
                                          const CVector<uint16_t>& vecLevelList,
                                          const int                iNumClients );
+    void CreateCLRegisterServerResp    ( const CHostAddress& InetAddr,
+                                         const ESvrRegResult eResult );
 
     static bool ParseMessageFrame ( const CVector<uint8_t>& vecbyData,
                                     const int               iNumBytesIn,
@@ -246,6 +249,8 @@ protected:
     bool EvaluateCLReqConnClientsListMes ( const CHostAddress&     InetAddr );
     bool EvaluateCLChannelLevelListMes   ( const CHostAddress&     InetAddr,
                                            const CVector<uint8_t>& vecData );
+    bool EvaluateCLRegisterServerResp    ( const CHostAddress&     InetAddr,
+                                           const CVector<uint8_t>& vecData );
 
     int                     iOldRecID;
     int                     iOldRecCnt;
@@ -305,4 +310,6 @@ signals:
     void CLReqConnClientsList         ( CHostAddress           InetAddr );
     void CLChannelLevelListReceived   ( CHostAddress           InetAddr,
                                         CVector<uint16_t>      vecLevelList );
+    void CLRegisterServerResp         ( CHostAddress           InetAddr,
+                                        ESvrRegResult          eStatus );
 };

src/server.cpp

@@ -438,6 +438,10 @@ CServer::CServer ( const int          iNewMaxNumChan,
         SIGNAL ( CLReqServerList ( CHostAddress ) ),
         this, SLOT ( OnCLReqServerList ( CHostAddress ) ) );
 
+    QObject::connect ( &ConnLessProtocol,
+        SIGNAL ( CLRegisterServerResp ( CHostAddress, ESvrRegResult ) ),
+        this, SLOT ( OnCLRegisterServerResp ( CHostAddress, ESvrRegResult ) ) );
+
     QObject::connect ( &ConnLessProtocol,
         SIGNAL ( CLSendEmptyMes ( CHostAddress ) ),
         this, SLOT ( OnCLSendEmptyMes ( CHostAddress ) ) );
@@ -454,6 +458,10 @@ CServer::CServer ( const int          iNewMaxNumChan,
         SIGNAL ( CLReqConnClientsList ( CHostAddress ) ),
         this, SLOT ( OnCLReqConnClientsList ( CHostAddress ) ) );
 
+    QObject::connect ( &ServerListManager,
+       SIGNAL ( SvrRegStatusChanged() ),
+       this, SLOT ( OnSvrRegStatusChanged() ) );
+
     // CODE TAG: MAX_NUM_CHANNELS_TAG
     // make sure we have MAX_NUM_CHANNELS connections!!!
     // send message

src/server.h

@@ -190,6 +190,7 @@ public:
     QLocale::Country GetServerCountry()
         { return ServerListManager.GetServerCountry(); }
 
+    ESvrRegStatus GetSvrRegStatus() { return ServerListManager.GetSvrRegStatus(); }
 
     // GUI settings ------------------------------------------------------------
     void SetAutoRunMinimized ( const bool NAuRuMin ) { bAutoRunMinimized = NAuRuMin; }
@@ -305,6 +306,7 @@ signals:
     void Started();
     void Stopped();
     void ClientDisconnected ( const int iChID );
+    void SvrRegStatusChanged();
     void AudioFrame ( const int              iChID,
                       const QString          stChName,
                       const CHostAddress     RecHostAddr,
@@ -373,6 +375,14 @@ public slots:
         ServerListManager.CentralServerRegisterServer ( InetAddr, LInetAddr, ServerInfo );
     }
 
+    void OnCLRegisterServerResp ( CHostAddress  /* unused */,
+                                  ESvrRegResult eResult )
+    {
+        ServerListManager.StoreRegistrationResult ( eResult );
+    }
+
+    void OnSvrRegStatusChanged() { emit SvrRegStatusChanged(); }
+
     void OnCLUnregisterServerReceived ( CHostAddress InetAddr )
     {
         ServerListManager.CentralServerUnregisterServer ( InetAddr );

src/serverdlg.cpp

@@ -61,15 +61,20 @@ CServerDlg::CServerDlg ( CServer*        pNServP,
         "Dialog:</b> If enabled, a Creative Commons Licence dialog is shown "
         "each time a new user connects the server." ) );
 
-    // register server flag
+    // Make My Server Public flag
-    chbRegisterServer->setWhatsThis ( tr ( "<b>Register Server Status:</b> If "
+    chbRegisterServer->setWhatsThis ( tr ( "<b>Make My Server Public:</b> If "
-        "the register server check box is checked, this server registers "
+        "the Make My Server Public check box is checked, this server registers "
         "itself at the central server so that all " ) + APP_NAME +
         tr ( " users can see the server in the connect dialog server list and "
         "connect to it. The registering of the server is renewed periodically "
         "to make sure that all servers in the connect dialog server list are "
         "actually available." ) );
 
+    // register server status label
+    lblRegSvrStatus->setWhatsThis ( tr ( "<b>Register Server Status:</b> If "
+        "the Make My Server Public check box is checked, this will show "
+        "the success of registration with the central server." ) );
+
     // central server address
     QString strCentrServAddr = tr ( "<b>Central Server Address:</b> The "
         "Central server address is the IP address or URL of the central server "
@@ -322,6 +327,9 @@ lvwClients->setMinimumHeight ( 140 );
     QObject::connect ( pServer, SIGNAL ( Stopped() ),
         this, SLOT ( OnServerStopped() ) );
 
+    QObject::connect ( pServer, SIGNAL ( SvrRegStatusChanged() ),
+        this, SLOT ( OnSvrRegStatusChanged() ) );
+
     QObject::connect ( QCoreApplication::instance(), SIGNAL ( aboutToQuit() ),
         this, SLOT ( OnAboutToQuit() ) );
 
@@ -507,6 +515,8 @@ void CServerDlg::UpdateGUIDependencies()
 
     const bool bCurUseDefCentServAddr = ( pServer->GetCentralServerAddressType() != AT_MANUAL );
 
+    const ESvrRegStatus eSvrRegStatus = pServer->GetSvrRegStatus();
+
     // if register server is not enabled, we disable all the configuration
     // controls for the server list
     cbxCentServAddrType->setEnabled ( bCurSerListEnabled );
@@ -534,6 +544,34 @@ void CServerDlg::UpdateGUIDependencies()
     // server list is enabled and not the default address is used
     edtCentralServerAddress->setEnabled (
         !bCurUseDefCentServAddr && bCurSerListEnabled );
+
+    QString strStatus;
+    switch ( eSvrRegStatus )
+    {
+    case SRS_UNREGISTERED:
+        strStatus = "Unregistered";
+        break;
+    case SRS_BAD_ADDRESS:
+        strStatus = "Bad address";
+        break;
+    case SRS_REQUESTED:
+        strStatus = "Registration requested";
+        break;
+    case SRS_TIME_OUT:
+        strStatus = "Using longer retries";
+        break;
+    case SRS_UNKNOWN_RESP:
+        strStatus = "Check server version, retrying";
+        break;
+    case SRS_REGISTERED:
+        strStatus = "Registered";
+        break;
+    case SRS_CENTRAL_SVR_FULL:
+        strStatus = "Central Server full";
+        break;
+    }
+    lblRegSvrStatus->setText( strStatus );
+
 }
 
 void CServerDlg::UpdateSystemTrayIcon ( const bool bIsActive )

src/serverdlg.h

@@ -94,6 +94,7 @@ public slots:
     void OnTimer();
     void OnServerStarted() { UpdateSystemTrayIcon ( true ); }
     void OnServerStopped() { UpdateSystemTrayIcon ( false ); }
+    void OnSvrRegStatusChanged() { UpdateGUIDependencies(); }
     void OnSysTrayMenuOpen() { ShowWindowInForeground(); }
     void OnSysTrayMenuHide() { hide(); }
     void OnSysTrayMenuExit() { close(); }

src/serverdlgbase.ui

@@ -61,11 +61,38 @@
     </widget>
    </item>
    <item>
-    <widget class="QCheckBox" name="chbRegisterServer">
+    <layout class="QHBoxLayout">
-     <property name="text">
+     <item>
-      <string>Make My Server Public (Register My Server in the Server List)</string>
+       <widget class="QCheckBox" name="chbRegisterServer">
-     </property>
+        <property name="text">
-    </widget>
+         <string>Make My Server Public (Register My Server in the Server List)</string>
+        </property>
+       </widget>
+     </item>
+     <item>
+      <spacer>
+       <property name="orientation">
+        <enum>Qt::Horizontal</enum>
+       </property>
+       <property name="sizeType">
+        <enum>QSizePolicy::Expanding</enum>
+       </property>
+       <property name="sizeHint" stdset="0">
+        <size>
+         <width>20</width>
+         <height>20</height>
+        </size>
+       </property>
+      </spacer>
+     </item>
+     <item>
+      <widget class="QLabel" name="lblRegSvrStatus">
+       <property name="text">
+        <string>STATUS</string>
+       </property>
+      </widget>
+     </item>
+    </layout>
    </item>
    <item>
     <layout class="QHBoxLayout">

src/serverlist.cpp

@@ -34,7 +34,9 @@ CServerListManager::CServerListManager ( const quint16  iNPortNum,
     : iNumPredefinedServers     ( 0 ),
       eCentralServerAddressType ( AT_MANUAL ), // must be AT_MANUAL for the "no GUI" case
       bCentServPingServerInList ( bNCentServPingServerInList ),
-      pConnLessProtocol         ( pNConLProt )
+      pConnLessProtocol         ( pNConLProt ),
+      eSvrRegStatus             ( SRS_UNREGISTERED ),
+      iSvrRegRetries            ( 0 )
 {
     // set the central server address
     SetCentralServerAddress ( sNCentServAddr );
@@ -177,6 +179,11 @@ CServerListManager::CServerListManager ( const quint16  iNPortNum,
 
     QObject::connect ( &TimerRegistering, SIGNAL ( timeout() ),
         this, SLOT ( OnTimerRegistering() ) );
+
+    TimerCLRegisterServerResp.setSingleShot ( true );
+    TimerCLRegisterServerResp.setInterval ( REGISTER_SERVER_TIME_OUT_MS );
+    QObject::connect ( &TimerCLRegisterServerResp, SIGNAL ( timeout() ),
+        this, SLOT ( OnTimerCLRegisterServerResp() ) );
 }
 
 void CServerListManager::SetCentralServerAddress ( const QString sNCentServAddr )
@@ -239,6 +246,12 @@ void CServerListManager::Update()
             }
             locker.relock();
 
+            // reset the retry counter to zero because update was called
+            iSvrRegRetries = 0;
+
+            // start timer for registration timeout
+            TimerCLRegisterServerResp.start();
+
             // start timer for registering this server at the central server
             // 1 minute = 60 * 1000 ms
             TimerRegistering.start ( SERVLIST_REGIST_INTERV_MINUTES * 60000 );
@@ -266,6 +279,7 @@ void CServerListManager::Update()
         }
         else
         {
+            TimerCLRegisterServerResp.stop();
             TimerRegistering.stop();
             TimerPingCentralServer.stop();
         }
@@ -297,7 +311,7 @@ void CServerListManager::OnTimerPollList()
     // server entry) and the predefined servers if they are still valid.
     // Note that we have to use "ServerList.size()" function in the for loop
     // since we may remove elements from the server list inside the for loop.
-    for ( int iIdx = 1 + iNumPredefinedServers; iIdx < ServerList.size(); iIdx++ )
+    for ( int iIdx = 1 + iNumPredefinedServers; iIdx < ServerList.size(); )
     {
         // 1 minute = 60 * 1000 ms
         if ( ServerList[iIdx].RegisterTime.elapsed() >
@@ -306,6 +320,11 @@ void CServerListManager::OnTimerPollList()
             // remove this list entry
             ServerList.removeAt ( iIdx );
         }
+        else
+        {
+            // Move to the next entry (only on else)
+            iIdx++;
+        }
     }
 }
 
@@ -346,6 +365,7 @@ void CServerListManager::CentralServerRegisterServer ( const CHostAddress&    In
             {
                 // create a new server list entry and init with received data
                 ServerList.append ( CServerListEntry ( InetAddr, LInetAddr, ServerInfo ) );
+                iSelIdx = iCurServerListSize;
             }
         }
         else
@@ -364,6 +384,10 @@ void CServerListManager::CentralServerRegisterServer ( const CHostAddress&    In
                 ServerList[iSelIdx].UpdateRegistration();
             }
         }
+
+        pConnLessProtocol->CreateCLRegisterServerResp ( InetAddr, iSelIdx == ciInvalidIdx
+                                                            ? ESvrRegResult::SRR_CENTRAL_SVR_FULL
+                                                            : ESvrRegResult::SRR_REGISTERED );
     }
 }
 
@@ -452,6 +476,30 @@ void CServerListManager::CentralServerQueryServerList ( const CHostAddress& Inet
 
 
 /* Slave server functionality *************************************************/
+void CServerListManager::StoreRegistrationResult ( ESvrRegResult eResult )
+{
+    // we need the lock since the user might change the server properties at
+    // any time so another response could arrive
+    QMutexLocker locker ( &Mutex );
+
+    // We got some response, so stop the retry timer
+    TimerCLRegisterServerResp.stop();
+
+    eSvrRegStatus = ESvrRegStatus::SRS_UNKNOWN_RESP;
+
+    switch  ( eResult )
+    {
+    case ESvrRegResult::SRR_REGISTERED:
+        eSvrRegStatus = ESvrRegStatus::SRS_REGISTERED;
+        break;
+    case ESvrRegResult::SRR_CENTRAL_SVR_FULL:
+        eSvrRegStatus = ESvrRegStatus::SRS_CENTRAL_SVR_FULL;
+        break;
+    }
+
+    emit SvrRegStatusChanged();
+}
+
 void CServerListManager::OnTimerPingCentralServer()
 {
     QMutexLocker locker ( &Mutex );
@@ -465,6 +513,32 @@ void CServerListManager::OnTimerPingCentralServer()
     }
 }
 
+void CServerListManager::OnTimerCLRegisterServerResp()
+{
+    QMutexLocker locker ( &Mutex );
+
+    if ( eSvrRegStatus == SRS_REQUESTED )
+    {
+        iSvrRegRetries++;
+        if ( iSvrRegRetries >= REGISTER_SERVER_RETRY_LIMIT )
+        {
+            eSvrRegStatus = SRS_TIME_OUT;
+            emit SvrRegStatusChanged();
+        }
+        else
+        {
+            locker.unlock();
+            {
+                OnTimerRegistering();
+            }
+            locker.relock();
+
+            // re-start timer for registration timeout
+            TimerCLRegisterServerResp.start();
+        }
+    }
+}
+
 void CServerListManager::SlaveServerRegisterServer ( const bool bIsRegister )
 {
     // we need the lock since the user might change the server properties at
@@ -488,6 +562,9 @@ void CServerListManager::SlaveServerRegisterServer ( const bool bIsRegister )
         if ( bIsRegister )
         {
             // register server
+            eSvrRegStatus = SRS_REQUESTED;
+            emit SvrRegStatusChanged();
+
             pConnLessProtocol->CreateCLRegisterServerMes ( SlaveCurCentServerHostAddress,
                                                            SlaveCurLocalHostAddress,
                                                            ServerList[0] );
@@ -495,7 +572,15 @@ void CServerListManager::SlaveServerRegisterServer ( const bool bIsRegister )
         else
         {
             // unregister server
+            eSvrRegStatus = SRS_UNREGISTERED;
+            emit SvrRegStatusChanged();
+
             pConnLessProtocol->CreateCLUnregisterServerMes ( SlaveCurCentServerHostAddress );
         }
     }
+    else
+    {
+        eSvrRegStatus = SRS_BAD_ADDRESS;
+        emit SvrRegStatusChanged();
+    }
 }

src/serverlist.h

@@ -171,6 +171,10 @@ public:
 
     QLocale::Country GetServerCountry() { return ServerList[0].eCountry; }
 
+    ESvrRegStatus GetSvrRegStatus() { return eSvrRegStatus; }
+
+    void StoreRegistrationResult ( ESvrRegResult eStatus );
+
 protected:
     void SlaveServerRegisterServer ( const bool bIsRegister );
 
@@ -178,6 +182,7 @@ protected:
     QTimer                  TimerRegistering;
     QTimer                  TimerPingServerInList;
     QTimer                  TimerPingCentralServer;
+    QTimer                  TimerCLRegisterServerResp;
 
     QMutex                  Mutex;
 
@@ -195,10 +200,20 @@ protected:
 
     CProtocol*              pConnLessProtocol;
 
+    // server registration status
+    ESvrRegStatus           eSvrRegStatus;
+
+    // count of registration retries
+    int                     iSvrRegRetries;
+
 public slots:
     void OnTimerPollList();
     void OnTimerPingServerInList();
     void OnTimerPingCentralServer();
+    void OnTimerCLRegisterServerResp();
     void OnTimerRegistering() { SlaveServerRegisterServer ( true ); }
     void OnTimerIsPermanent() { ServerList[0].bPermanentOnline = true; }
+
+signals:
+    void SvrRegStatusChanged();
 };

src/util.h

@@ -572,6 +572,27 @@ enum ECSAddType
 };
 
 
+// Slave server registration state ---------------------------------------------
+enum ESvrRegStatus
+{
+    SRS_UNREGISTERED = 0,
+    SRS_BAD_ADDRESS = 1,
+    SRS_REQUESTED = 2,
+    SRS_TIME_OUT = 3,
+    SRS_UNKNOWN_RESP = 4,
+    SRS_REGISTERED = 5,
+    SRS_CENTRAL_SVR_FULL = 6
+};
+
+
+// Central server registration outcome -----------------------------------------
+enum ESvrRegResult
+{
+    SRR_REGISTERED = 0,
+    SRR_CENTRAL_SVR_FULL = 1
+};
+
+
 // Skill level enum ------------------------------------------------------------
 enum ESkillLevel
 {