void SyncManagerImpl::OnIdentityInfoReceived(const NetworkConnectionPtr& connection, NetworkInMessage& msg)
{
size_t connectionIndex;
if (GetIndexOfConnection(connection, connectionIndex))
{
#if defined(SYNC_DEBUG)
LogInfo("Sync: Received Handshake");
#endif
RemoteSyncPeer& remotePeer = m_remoteHosts[connectionIndex];
remotePeer.m_authorityLevel = static_cast<AuthorityLevel>(msg.ReadByte());
remotePeer.m_systemID = msg.ReadInt32();
remotePeer.m_userName = msg.ReadStdString();
remotePeer.m_userID = msg.ReadInt32();
// Verify that this systemID is not already in use by another machine. If so, force a disconnection
// rather than risk data corruption, because GUIDS are based on SystemIDs
bool duplicateSystemIDFound = (m_syncContext->GetLocalSystemID() == remotePeer.m_systemID);
if (!duplicateSystemIDFound)
{
for (size_t i = 0; i < m_remoteHosts.size(); ++i)
{
if (i == connectionIndex) continue;
if (m_remoteHosts[i].m_systemID == remotePeer.m_systemID)
{
duplicateSystemIDFound = true;
break;
}
}
}
// The sync system will break down if two machines of equal authority level connect.
// So verify that they are different levels, or else disconnect
bool authLevelsMatch = (remotePeer.m_authorityLevel == m_syncContext->GetAuthorityLevel());
if (duplicateSystemIDFound || authLevelsMatch)
{
// We're registered to receive disconnect callbacks, so we know that SyncManagerImpl::OnDisconnected()
// will be called as a result of calling this.
if (authLevelsMatch)
{
LogError("Two machines with equal authority levels have connected: breaking the connection to avoid sync data corruption");
}
else
{
LogError("Duplicate system ID detected: breaking the connection to avoid sync data corruption");
}
XTASSERT(!duplicateSystemIDFound);
connection->Disconnect();
}
// We should not be receiving a handshake message more than once
XTASSERT(remotePeer.m_bHandshakeComplete == false);
remotePeer.m_bHandshakeComplete = true;
}
}
void SyncManagerImpl::OnMessageReceived(const NetworkConnectionPtr& connection, NetworkInMessage& msg)
{
SyncMessages messageType = (SyncMessages)msg.ReadByte();
switch (messageType)
{
case IdentityInfo:
OnIdentityInfoReceived(connection, msg);
break;
case SyncChanges:
OnSyncChangeReceived(connection, msg);
break;
}
}
void SyncManagerImpl::OnSyncChangeReceived(const NetworkConnectionPtr& connection, NetworkInMessage& msg)
{
#if defined(SYNC_DEBUG)
LogInfo("%s ReceivedSyncPacket", m_syncContext->GetLocalUser()->GetName().GetString().c_str());
#endif
size_t connectionIndex;
if (GetIndexOfConnection(connection, connectionIndex))
{
RemoteSyncPeer& remotePeer = m_remoteHosts[connectionIndex];
if (XTVERIFY(remotePeer.m_bHandshakeComplete))
{
XTASSERT(remotePeer.m_systemID != kUnknownSystemID);
// Read out the number of ops sent in this message
int32 numOps = msg.ReadInt32();
// Read out each of the ops
for (int32 i = 0; i < numOps; ++i)
{
VersionedOp incomingVersionedOp;
// Read the state that the remote machine was in before the op was applied
incomingVersionedOp.m_state.m_opsSent = msg.ReadInt32();
incomingVersionedOp.m_state.m_opsReceived = msg.ReadInt32();
// Read the type of the op
Operation::Type opType = (Operation::Type)msg.ReadByte();
// Create an op of the appropriate type
OperationPtr incomingOp = m_syncContext->GetOpFactory().Make(opType, remotePeer.m_authorityLevel);
// Read the op data
incomingOp->Deserialize(msg);
incomingVersionedOp.m_op = incomingOp;
// Add it to the list of incoming ops
remotePeer.m_incoming.push_back(incomingVersionedOp);
}
}
}
}
void CreateOperation::Deserialize(NetworkInMessage& msg)
{
m_elementType = (ElementType)msg.ReadByte();
m_name = msg.ReadString();
m_elementGuid = msg.ReadInt64();
m_parentGuid = msg.ReadInt64();
m_startingValue.Deserialize(msg);
// Read the number of ancestors
uint32 numAncestors = msg.ReadUInt32();
m_hierarchy.reserve(numAncestors);
// Read the GUIDs of the ancestors
for (uint32 i = 0; i < numAncestors; ++i)
{
m_hierarchy.push_back(msg.ReadInt64());
}
// NOTE: authority level is NOT included in the op when serialized; it changes as the op is sent around the network
}