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engine/matchmakingmigrate.cpp

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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: Handles host migration for a session (not for the game server)
+//
+//=============================================================================//
+
+#include "matchmaking.h"
+
+// memdbgon must be the last include file in a .cpp file!!!
+#include "tier0/memdbgon.h"
+
+//-----------------------------------------------------------------------------
+// Purpose: Start a Matchmaking session as the host 
+//-----------------------------------------------------------------------------
+CClientInfo *CMatchmaking::SelectNewHost()
+{
+	// For now, just grab the first guy in the list
+	CClientInfo *pClient = &m_Local;
+	for ( int i = 0; i < m_Remote.Count(); ++i )
+	{
+		if ( m_Remote[i]->m_id > pClient->m_id )
+		{
+			pClient = m_Remote[i];
+		}
+	}
+	return pClient;
+}
+
+//-----------------------------------------------------------------------------
+// Purpose:
+//-----------------------------------------------------------------------------
+void CMatchmaking::StartHostMigration()
+{
+	SwitchToState( MMSTATE_HOSTMIGRATE_STARTINGMIGRATION );
+
+	m_pNewHost = SelectNewHost();
+	if ( m_pNewHost == &m_Local )
+	{
+		// We're the new host, so start hosting
+		Msg( "Starting new host" );
+		BeginHosting();
+	}
+	else
+	{
+		Msg( "Waiting for a new host" );
+		SwitchToNewHost();
+	}
+}
+
+//-----------------------------------------------------------------------------
+// Purpose:
+//-----------------------------------------------------------------------------
+void CMatchmaking::BeginHosting()
+{
+	m_Session.SetIsHost( true );
+	m_Host = m_Local;
+
+	// Move into private slots
+	if ( !m_Local.m_bInvited )
+	{
+		RemovePlayersFromSession( &m_Local );
+		m_Local.m_bInvited = true;
+		AddPlayersToSession( &m_Local );
+	}
+
+	if ( !m_Session.MigrateHost() )
+	{
+		Warning( "Session migrate failed!\n" );
+
+		SessionNotification( SESSION_NOTIFY_FAIL_MIGRATE );
+		return;
+	}
+
+	SwitchToState( MMSTATE_HOSTMIGRATE_MIGRATING );
+}
+
+//-----------------------------------------------------------------------------
+// Purpose:
+//-----------------------------------------------------------------------------
+void CMatchmaking::TellClientsToMigrate()
+{
+	Msg( "Sending migrate request\n" );
+
+	XSESSION_INFO info;
+	m_Session.GetNewSessionInfo( &info );
+
+	MM_Migrate msg;
+	msg.m_MsgType = MM_Migrate::MESSAGE_HOSTING;
+	msg.m_Id = m_Local.m_id;
+	msg.m_sessionId = info.sessionID; 
+	msg.m_xnaddr = info.hostAddress;  
+	msg.m_key = info.keyExchangeKey;
+
+	for ( int i = 0; i < m_Remote.Count(); ++i )
+	{
+		if ( m_Remote[i]->m_bMigrated )
+		{
+			continue;
+		}
+
+		SendMessage( &msg, &m_Remote[i]->m_adr );
+	}
+
+	m_fSendTimer = GetTime();
+	++m_nSendCount;
+}
+
+//-----------------------------------------------------------------------------
+// Purpose: Handle a migration message from our new host
+//-----------------------------------------------------------------------------
+bool CMatchmaking::ProcessMigrate( MM_Migrate *pMsg )
+{
+	MM_Migrate reply;
+	int type = pMsg->m_MsgType;
+
+	if ( m_CurrentState == MMSTATE_HOSTMIGRATE_WAITINGFORHOST )
+	{
+		if ( type == MM_Migrate::MESSAGE_HOSTING )
+		{
+			// Make sure this is the host we were expecting
+			if ( !Q_memcmp( &pMsg->m_xnaddr, &m_Host.m_xnaddr, sizeof( m_Host.m_xnaddr ) ) )
+			{
+				// Reply to the host
+				reply.m_MsgType = MM_Migrate::MESSAGE_MIGRATED;
+				reply.m_xnaddr = m_Local.m_xnaddr;
+				SendMessage( &reply, &m_Host.m_adr );
+
+				XSESSION_INFO info;
+				info.sessionID = pMsg->m_sessionId;
+				info.hostAddress = pMsg->m_xnaddr;
+				info.keyExchangeKey = pMsg->m_key;
+
+				m_Session.SetNewSessionInfo( &info );
+				m_Session.SetOwnerId( XUSER_INDEX_NONE );
+
+				if ( !m_Session.MigrateHost() )
+				{
+					Warning( "Session migrate failed!\n" );
+
+					SessionNotification( SESSION_NOTIFY_FAIL_MIGRATE );
+					return true;
+				}
+
+				SwitchToState( MMSTATE_HOSTMIGRATE_MIGRATING );
+			}
+			else
+			{
+				// Someone else is trying to host
+				reply.m_MsgType = MM_Migrate::MESSAGE_STANDBY;
+				SendMessage( &reply, &m_Host.m_adr );
+			}
+		}
+	}
+	else if ( m_CurrentState == MMSTATE_HOSTMIGRATE_WAITINGFORCLIENTS )
+	{
+		if ( type == MM_Migrate::MESSAGE_MIGRATED )
+		{
+			// Flag the client as having migrated
+			bool bClientsOutstanding = false;
+
+			for ( int i = 0; i < m_Remote.Count(); ++i )
+			{
+				if ( m_Remote[i]->m_id == pMsg->m_Id )
+				{
+					m_Remote[i]->m_bMigrated = true;
+				}
+
+				bClientsOutstanding = bClientsOutstanding && m_Remote[i]->m_bMigrated;
+			}
+
+			if ( !bClientsOutstanding )
+			{
+				// Everyone's migrated!
+				EndMigration();
+			}
+		}
+
+		if ( type == MM_Migrate::MESSAGE_STANDBY )
+		{
+			// Someone requested a standby
+			--m_nSendCount;
+		}
+	}
+
+	return true;
+}
+
+
+//-----------------------------------------------------------------------------
+// Purpose:
+//-----------------------------------------------------------------------------
+void CMatchmaking::SwitchToNewHost()
+{
+	// Set a timer to wait for the host to contact us
+	m_fWaitTimer = GetTime();
+
+	// Get rid of the current host net channel
+	MarkChannelForRemoval( &m_Host.m_adr );
+
+	AddRemoteChannel( &m_pNewHost->m_adr );
+
+	SwitchToState( MMSTATE_HOSTMIGRATE_WAITINGFORHOST );
+}
+
+//-----------------------------------------------------------------------------
+// Purpose:
+//-----------------------------------------------------------------------------
+void CMatchmaking::EndMigration()
+{
+	Msg( "Migration complete\n" );
+
+	if ( m_Session.IsHost() )
+	{
+		// Drop any clients that failed to migrate
+		for ( int i = m_Remote.Count()-1; i >= 0; --i )
+		{
+			ClientDropped( m_Remote[i] );
+		}
+
+		// Update the lobby to show the new host
+		SendPlayerInfoToLobby( &m_Local, 0 );
+
+		// X360TBD: Figure out what state we should be in
+		int newState = m_PreMigrateState;
+		switch( m_PreMigrateState )
+		{
+		case MMSTATE_SESSION_CONNECTING:
+			newState = MMSTATE_ACCEPTING_CONNECTIONS;
+			break;
+
+		default:
+			Warning( "Unhandled post-migrate state transition" );
+		}
+
+		// Don't use SwitchToState() to set our new state because when changing 
+		// from a client to a host the state transition is usually invalid.
+		m_CurrentState = newState;
+	}
+	else
+	{
+		// Still a client, just restore our previous state
+		m_CurrentState =  m_PreMigrateState;
+	}
+}
+
+void CMatchmaking::TestStats()
+{
+
+}