Inventory2/scenes/ItemManager.cs

public partial class ItemManager : Node
{
	public Dictionary<uint, Item> TrackedItems { get; } = [];

	public override void _Ready()
	{
		var items = GetParent().FindChildren("*", "res://objects/Item.cs", owned: false).Cast<Item>();
		foreach (var item in items) Add(item);
	}

	public void Add(Item item)
	{
		if (item.Manager != null) throw new ArgumentException(
			$"Item '{item.GetPath()}' is already part of another scene");

		// Generate a random, unused id for this item.
		uint id; do { id = Randi(); } while (TrackedItems.ContainsKey(id));
		TrackedItems.Add(id, item);

		item.Manager    = this;
		item.TrackingId = id;
	}

	public void Remove(Item item)
	{
		if (item.Manager != this) throw new ArgumentException(
			$"Item '{item.GetPath()}' is not part of this scene");

		TrackedItems.Remove(item.TrackingId);

		item.Manager    = null;
		item.TrackingId = 0;
	}


	// FIXME: This should be fixed in 4.3 and thus not required anymore?
	// FIXME: Don't actually rely on item path, use its TrackingId.
	// https://github.com/godotengine/godot/issues/85883

	internal enum RequestFunc { RequestPickup, RequestPlace, RequestThrow }
	internal enum AcceptFunc { AcceptPickup, AcceptPlace, AcceptThrow }

	[Rpc(RpcMode.AnyPeer)]
	internal void RelayRequest(NodePath itemPath, RequestFunc func, Godot.Collections.Array args)
	{
		var item = this.GetNodeOrThrow<Item>(itemPath);
		var callable = new Callable(item, func.ToString());
		callable.Call(args.ToArray());
	}

	[Rpc(CallLocal = true)]
	internal void RelayAccept(NodePath itemPath, AcceptFunc func, Godot.Collections.Array args)
	{
		var item = this.GetNodeOrThrow<Item>(itemPath);

		if (GetMultiplayerAuthority() != item.GetMultiplayerAuthority())
			throw new InvalidOperationException(
				$"Item {item.GetPath()} not owned by correct player");

		var callable = new Callable(item, func.ToString());
		callable.Call(args.ToArray());
	}
}