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Add network objects ownership changing with network sync

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This commit is contained in:
Wojciech Figat
2022-10-24 15:02:11 +02:00
parent 494de7a9f4
commit 30fdde614d
4 changed files with 134 additions and 5 deletions
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128
Source/Engine/Networking/NetworkReplicator.cpp
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@@ -49,6 +49,13 @@ PACK_STRUCT(struct NetworkMessageObjectDespawn
Guid ObjectId;
});
PACK_STRUCT(struct NetworkMessageObjectRole
{
NetworkMessageIDs ID = NetworkMessageIDs::ObjectRole;
Guid ObjectId;
uint32 OwnerClientId;
});
struct NetworkReplicatedObject
{
ScriptingObjectReference<ScriptingObject> Object;
@@ -180,6 +187,30 @@ NetworkReplicatedObject* ResolveObject(Guid objectId, Guid parentId, char object
return nullptr;
}
void SendObjectRoleMessage(const NetworkReplicatedObject& item, const NetworkClient* excludedClient = nullptr)
{
auto peer = NetworkManager::Peer;
NetworkMessageObjectRole msgData;
msgData.ObjectId = item.ObjectId;
msgData.OwnerClientId = item.OwnerClientId;
NetworkMessage msg = peer->BeginSendMessage();
msg.WriteStructure(msgData);
if (NetworkManager::IsClient())
{
NetworkManager::Peer->EndSendMessage(NetworkChannelType::ReliableOrdered, msg);
}
else
{
CachedTargets.Clear();
for (const NetworkClient* client : NetworkManager::Clients)
{
if (client->State == NetworkConnectionState::Connected && client != excludedClient)
CachedTargets.Add(client->Connection);
}
peer->EndSendMessage(NetworkChannelType::ReliableOrdered, msg, CachedTargets);
}
}
#if !COMPILE_WITHOUT_CSHARP
#include "Engine/Scripting/ManagedCLR/MUtils.h"
@@ -321,6 +352,45 @@ NetworkObjectRole NetworkReplicator::GetObjectRole(ScriptingObject* obj)
return role;
}
void NetworkReplicator::SetObjectOwnership(ScriptingObject* obj, uint32 ownerClientId, NetworkObjectRole localRole)
{
if (!obj)
return;
ScopeLock lock(ObjectsLock);
const auto it = Objects.Find(obj->GetID());
if (it == Objects.End())
return;
auto& item = it->Item;
if (item.Object != obj)
return;
// Check if this client is object owner
if (item.OwnerClientId == NetworkManager::LocalClientId)
{
// Check if object owner will change
if (item.OwnerClientId != ownerClientId)
{
// Change role locally
CHECK(localRole != NetworkObjectRole::OwnedAuthoritative);
item.OwnerClientId = ownerClientId;
item.LastOwnerFrame = 1;
item.Role = localRole;
SendObjectRoleMessage(item);
}
else
{
// Object is the owner
CHECK(localRole == NetworkObjectRole::OwnedAuthoritative);
}
}
else
{
// Allow to change local role of the object (except ownership)
CHECK(localRole != NetworkObjectRole::OwnedAuthoritative);
item.Role = localRole;
}
}
void NetworkInternal::NetworkReplicatorClientConnected(NetworkClient* client)
{
ScopeLock lock(ObjectsLock);
@@ -559,10 +629,13 @@ void NetworkInternal::OnNetworkMessageObjectReplicate(NetworkEvent& event, Netwo
if (!obj)
return;
// Reject replication from someone who is not an object owner
if (client && e->OwnerClientId != client->ClientId)
// Reject event from someone who is not an object owner
if (client && item.OwnerClientId != client->ClientId)
return;
// Skip replication if we own the object (eg. late replication message after ownership change)
if (item.Role == NetworkObjectRole::OwnedAuthoritative)
return;
ASSERT(e->Role != NetworkObjectRole::OwnedAuthoritative); // Ensure that we don't replicate object that we own
// Drop object replication if it has old data (eg. newer message was already processed due to unordered channel usage)
if (item.LastOwnerFrame >= msgData.OwnerFrame)
@@ -669,8 +742,8 @@ void NetworkInternal::OnNetworkMessageObjectDespawn(NetworkEvent& event, Network
if (!obj || !item.Spawned)
return;
// Reject despawn from someone who is not an object owner
if (client && e->OwnerClientId != client->ClientId)
// Reject event from someone who is not an object owner
if (client && item.OwnerClientId != client->ClientId)
return;
// Remove object
@@ -684,3 +757,48 @@ void NetworkInternal::OnNetworkMessageObjectDespawn(NetworkEvent& event, Network
#endif
}
}
void NetworkInternal::OnNetworkMessageObjectRole(NetworkEvent& event, NetworkClient* client, NetworkPeer* peer)
{
NetworkMessageObjectRole msgData;
event.Message.ReadStructure(msgData);
ScopeLock lock(ObjectsLock);
NetworkReplicatedObject* e = ResolveObject(msgData.ObjectId);
if (e)
{
auto& item = *e;
ScriptingObject* obj = item.Object.Get();
if (!obj)
return;
// Reject event from someone who is not an object owner
if (client && item.OwnerClientId != client->ClientId)
return;
// Update
item.OwnerClientId = msgData.OwnerClientId;
item.LastOwnerFrame = 1;
if (item.OwnerClientId == NetworkManager::LocalClientId)
{
// Upgrade ownership automatically
item.Role = NetworkObjectRole::OwnedAuthoritative;
item.LastOwnerFrame = 0;
}
else if (item.Role == NetworkObjectRole::OwnedAuthoritative)
{
// Downgrade ownership automatically
item.Role = NetworkObjectRole::Replicated;
}
if (!NetworkManager::IsClient())
{
// Server has to broadcast ownership message to the other clients
SendObjectRoleMessage(item, client);
}
}
else
{
#if NETWORK_REPLICATOR_DEBUG_LOG
LOG(Error, "[NetworkReplicator] Unknown object role update {}", msgData.ObjectId);
#endif
}
}