refactor: decouple game networking from lobby client

* Replace direct client/server networking references with GameClient/GameServer scenes
* Refactor message bus to support local emission and argument expansion
* Move lobby connection lifecycle handling to message bus events
* Remove multiplayer connection wait helpers and direct lobby client coupling
* Rename Server to ServerNetworking and update lobby client references
* Update scene resources and export configuration

billiards.gd

@@ -1,8 +1,8 @@
 class_name Billiards extends Node
 
 
-@onready var server_net: Node             = $server_net
-@onready var client_net: ClientNetworking = $client_net
+@onready var game_server: GameServer = $game_server
+@onready var game_client: GameClient = $game_client
 
 
 #
@@ -76,18 +76,17 @@ func _set_game_mode(mode: String) -> void:
 				Globals.game_data.GameModeType.SNOOKER
 
 
-
-
 func server_(arg: String) -> void:
 	var server_port = arg.split("_")[1]
 
-	server_net.start_server("0.0.0.0", int(server_port))
+	game_server.start_server("0.0.0.0", int(server_port))
 
 func host_(arg: String) -> void:
 	var game_mode  = arg.split("_")[1]
 	var match_name = OS.get_cmdline_user_args()[-1]
 
-	Globals.multiplayer_data.wait_for_connection()
+	while not $scene/lobby_screen.client.lobby_fully_connected:
+		await  get_tree().process_frame
 
 	$scene/lobby_screen.find_child(game_mode, true, false).emit_signal("pressed")
 	$scene/lobby_screen.find_child("new_match_name_input", true, false).text = match_name
@@ -99,13 +98,14 @@ func join_server(_arg: String) -> void:
 
 	Globals.multiplayer_data.set_multiplayer_active()
 
+	# TODO: Need to check if true still...
 	# NOTE: Need to load lobby in order for signals to get bound
-	#       which then game server calls on its load to do handoff 
+	#       which then game server calls on its load to do handoff
 	Globals.game_state.set_game_scene(
 		"res://scenes/screens/lobby_screen/lobby.tscn"
 	)
 
-	client_net.start_client(server_address, int(server_port))
+	game_client.start_client(server_address, int(server_port))
 
 func client(_arg: String) -> void:
 	Globals.game_state.set_game_scene(
@@ -118,17 +118,13 @@ func game(_arg: String) -> void:
 	var game_mode = OS.get_cmdline_user_args()[-1]
 
 	_set_game_mode(game_mode)
-	Globals.multiplayer_data.set_multiplayer_active()
 
-	Globals.game_state.set_game_scene(
-		"res://scenes/game.tscn"
-	)
+	Globals.multiplayer_data.set_multiplayer_active()
+	Globals.game_state.set_game_scene( "res://scenes/game.tscn" )
 
 func join(_arg: String) -> void:
 	var _match_id = OS.get_cmdline_user_args()[-1]
 
-	Globals.multiplayer_data.wait_for_connection()
-
 	var button    = $scene/lobby_screen.find_child("join_bttn", true, false)
 	while not button:
 		await get_tree().process_frame

billiards.tscn

@@ -2,18 +2,16 @@
 
 [ext_resource type="Script" uid="uid://dbca7qndk7coq" path="res://billiards.gd" id="1_bhs8v"]
 [ext_resource type="PackedScene" uid="uid://dy51wny4x53f4" path="res://scenes/data_bridge/bridge.tscn" id="1_xa5nf"]
-[ext_resource type="Script" uid="uid://ci57tiuqsx1jp" path="res://scripts/client_networking.gd" id="3_hkpkv"]
-[ext_resource type="Script" uid="uid://bgnr36m8qvbx3" path="res://scripts/server_networking.gd" id="4_cni66"]
+[ext_resource type="PackedScene" uid="uid://cbvv2msu13vr2" path="res://game_client.tscn" id="3_hkpkv"]
+[ext_resource type="PackedScene" uid="uid://bss61m8hfvab3" path="res://game_server.tscn" id="4_cni66"]
 
 [node name="billiards" type="Node"]
 script = ExtResource("1_bhs8v")
 
 [node name="bridge" parent="." instance=ExtResource("1_xa5nf")]
 
-[node name="client_net" type="Node" parent="."]
-script = ExtResource("3_hkpkv")
+[node name="game_client" parent="." instance=ExtResource("3_hkpkv")]
 
-[node name="server_net" type="Node" parent="."]
-script = ExtResource("4_cni66")
+[node name="game_server" parent="." instance=ExtResource("4_cni66")]
 
 [node name="scene" type="Node" parent="."]

export_presets.cfg

@@ -54,7 +54,7 @@ dedicated_server=false
 custom_features=""
 export_filter="all_resources"
 include_filter=""
-exclude_filter="s"
+exclude_filter=".godot/*"
 export_path="../../builds/desktop/billiards/billiards.x86_64"
 patches=PackedStringArray()
 encryption_include_filters=""

game_client.gd

@@ -0,0 +1,35 @@
+class_name GameClient extends ClientNetworking
+
+
+func _ready() -> void:
+	setup_signals()
+
+
+func setup_signals() -> void:
+	MessageBus.subscribe("game_start_client", _start_client)
+
+	MessageBus.subscribe("game_wait_for_connection", _wait_for_connection)
+	MessageBus.subscribe("game_close_connection", _wait_close_connection)
+
+func _start_client(address: String = "127.0.0.1", port: int = 8080) -> void:
+	if peer: return
+	start_client(address, port)
+
+
+func client_connected_to_server() -> void:
+	push_warning("Connected to server!")
+
+func close_connection() -> void:
+	if not peer: return
+
+	push_warning("Disconnected from, server...")
+
+	unset_client()
+
+func client_disconnected_from_server() -> void:
+	push_warning("Disconnected from, server...")
+
+func client_connection_failed_to_server() -> void:
+	push_warning("Connection failed!")
+
+	unset_client()

game_client.gd.uid

@@ -0,0 +1 @@
+uid://cjtu1d1j35r32

game_client.tscn

@@ -0,0 +1,6 @@
+[gd_scene load_steps=2 format=3 uid="uid://cbvv2msu13vr2"]
+
+[ext_resource type="Script" uid="uid://cjtu1d1j35r32" path="res://game_client.gd" id="1_tea1p"]
+
+[node name="client_net" type="Node"]
+script = ExtResource("1_tea1p")

game_server.gd

@@ -0,0 +1,11 @@
+class_name GameServer extends ServerNetworking
+
+
+func _ready() -> void:
+	setup_signals()
+
+
+func setup_signals() -> void:
+	#MessageBus.subscribe("game_wait_for_connection", _wait_for_connection)
+	#MessageBus.subscribe("game_close_connection", _wait_close_connection)
+	pass

game_server.gd.uid

@@ -0,0 +1 @@
+uid://bndylf4rwtlkn

game_server.tscn

@@ -0,0 +1,6 @@
+[gd_scene load_steps=2 format=3 uid="uid://bss61m8hfvab3"]
+
+[ext_resource type="Script" uid="uid://bndylf4rwtlkn" path="res://game_server.gd" id="1_3xapr"]
+
+[node name="server_net" type="Node"]
+script = ExtResource("1_3xapr")

globals/message_bus.gd

@@ -11,8 +11,8 @@ func subscribe(id: String, callback: Callable) -> void:
 	message_types.get(id).append(callback)
 
 
-func emit(id: String, data: Variant) -> void:
-	emit_propagation(id, data)
+func emit_local(id: String, data: Variant, expand: bool = false) -> void:
+	emit_propagation(id, data, expand)
 
 
 # TODO: Need to actually validate client request. Also, message bus is more
@@ -21,22 +21,23 @@ func emit(id: String, data: Variant) -> void:
 @rpc("any_peer", "call_remote", "reliable")
 func emit_request(id: String, data: Variant, expand: bool = false) -> void:
 	if not multiplayer.is_server(): return
-
-	var listeners: Array = message_types.get(id)
-	if not listeners:
-		push_error("'%s' not an existing message type to send...", [id])
+	if not message_types.has(id):
+		push_error("'%s' not an existing message type to handle...", [id])
 		return
 
 	emit_propagation(id, data, expand)
 
 @rpc("authority", "call_local", "reliable")
 func emit_propagation(id: String, data: Variant, expand: bool = false) -> void:
-	var listeners: Array = message_types.get(id)
-	if not listeners:
-		push_error("'%s' not an existing message type to send...", [id])
+	if not message_types.has(id):
+		push_error("'%s' not an existing message type to handle...", [id])
 		return
 
-	for callback: Callable in listeners:
+	for callback: Callable in message_types.get(id):
+		if data == null:
+			callback.call()
+			continue
+
 		if not expand:
 			callback.call(data)
 		else:
@@ -44,12 +45,15 @@ func emit_propagation(id: String, data: Variant, expand: bool = false) -> void:
 
 @rpc("authority", "call_remote", "reliable")
 func emit_propagation_clients_only(id: String, data: Variant, expand: bool = false) -> void:
-	var listeners: Array = message_types.get(id)
-	if not listeners:
-		push_error("'%s' not an existing message type to send...", [id])
+	if not message_types.has(id):
+		push_error("'%s' not an existing message type to handle...", [id])
 		return
 
-	for callback: Callable in listeners:
+	for callback: Callable in message_types.get(id):
+		if data == null:
+			callback.call()
+			continue
+
 		if not expand:
 			callback.call(data)
 		else:

project.godot

@@ -72,7 +72,3 @@ jolt_physics_3d/simulation/velocity_steps=20
 jolt_physics_3d/simulation/position_steps=20
 3d/simulation/position_steps=10
 3d/simulation/velocity_steps=10
-
-[rendering]
-
-textures/vram_compression/import_etc2_astc=true

scenes/data_bridge/lobby_data.gd

@@ -1,9 +1,6 @@
 class_name LobbyData extends Node
 
 
-@onready var lobby_ui: Node
-
-
 func _init() -> void:
 	Globals.lobby_data = self
 
@@ -11,15 +8,16 @@ func _init() -> void:
 @rpc("authority", "reliable")
 func connect_to_game() -> void:
 	# NOTE: Leave the lobby
-	lobby_ui.client.close_connection()
-
-	Globals.multiplayer_data.wait_for_connection_close()
+	MessageBus.emit_local("lobby_close_connection", null)
 
 	# NOTE: Join target game server
-	# TODO: Don't use libby client... Use a created game client.
-	lobby_ui.client.start_client(
-		Globals.game_data.game_address,
-		Globals.game_data.game_port
+	MessageBus.emit_local(
+		"game_start_client",
+		[
+			Globals.game_data.game_address,
+			Globals.game_data.game_port
+		],
+		true
 	)
 
 @rpc("authority", "reliable")

scenes/data_bridge/multiplayer_data.gd

@@ -44,17 +44,6 @@ func init_match():
 		true
 	)
 
-func wait_for_connection() -> void:
-	while not Globals.lobby_data.lobby_ui.client.peer:
-		await get_tree().process_frame
-
-	while Globals.lobby_data.lobby_ui.client.peer.get_connection_status() != 2:
-		await get_tree().process_frame
-
-func wait_for_connection_close() -> void:
-	while Globals.lobby_data.lobby_ui.client.peer:
-		await get_tree().process_frame
-
 
 func set_multiplayer_inactive() -> void:
 	is_multiplayer_active = false

scenes/screens/lobby_screen/lobby.gd

@@ -2,17 +2,18 @@ class_name Lobby extends LobbyBase
 
 
 func _ready() -> void:
-	Globals.lobby_data.lobby_ui = self
-
 	setup_signals()
 
 func _exit_tree() -> void:
+	# TODO: Maybe no longer needed...
 	if Globals.multiplayer_data.is_multiplayer_active: return
+	client._do_wait_close_connection()
 
-	if client.peer:
-		client.close_connection()
 
 func setup_signals() -> void:
+	MessageBus.subscribe("lobby_wait_for_connection", client._do_wait_for_connection)
+	MessageBus.subscribe("lobby_close_connection", client._do_wait_close_connection)
+
 	MessageBus.subscribe("receive_match_list", _on_receive_match_list)
 	MessageBus.subscribe("match_list_activate_entry", _on_match_list_entry_activated)
 	MessageBus.subscribe("match_list_add_entry", _on_match_list_entry_added)
@@ -23,7 +24,7 @@ func setup_signals() -> void:
 func _server_host_started() -> void:
 	host_connect_bttn.visible = false
 
-# NOTE: 'matches_list' can be empty but so long as we get the call from the
+# NOTE: 'matches_list' can be empty; so long as we get the call from the
 #       server we know we are connected and thus hide respective UI elements.
 func _on_receive_match_list(matches_list: Array) -> void:
 	push_warning("Client Joined Host: Full Match List Recieved...\n", matches_list)
@@ -36,6 +37,8 @@ func _on_receive_match_list(matches_list: Array) -> void:
 	for match_entry in matches_list:
 		_create_match_entry(match_entry)
 
+	client.lobby_fully_connected = true
+
 func _on_match_list_entry_activated(match_id: String) -> void:
 	for match_entry in match_list.get_children():
 		match_entry.join_bttn.visible = false

scenes/screens/lobby_screen/lobby.tscn

@@ -3,7 +3,7 @@
 [ext_resource type="Script" uid="uid://dk7afnf7ol7dy" path="res://scenes/screens/lobby_screen/lobby.gd" id="1_hhiik"]
 [ext_resource type="PackedScene" uid="uid://dg7pgj6i5pk8p" path="res://scenes/ui_controls/lobby_screen/lobby_ui.tscn" id="2_lqt48"]
 [ext_resource type="Script" uid="uid://sihv0kwbcr33" path="res://scenes/screens/lobby_screen/lobby_rpc.gd" id="3_rurl6"]
-[ext_resource type="Script" uid="uid://ci57tiuqsx1jp" path="res://scripts/client_networking.gd" id="4_glu7g"]
+[ext_resource type="Script" uid="uid://dv7j35h2ngiq7" path="res://scenes/screens/lobby_screen/lobby_client.gd" id="4_glu7g"]
 
 [node name="lobby" type="Node"]
 script = ExtResource("1_hhiik")

scenes/screens/lobby_screen/lobby_base.gd

@@ -16,7 +16,7 @@ const MATCH_ENTRY                           = preload("res://scenes/screens/lobb
 @onready var new_match_name_input: LineEdit   = $ui/body/right_body/create_match_hbox/new_match_name_input
 
 @onready var rpc_signals: Node                = $rpc_signals
-@onready var client: Node                     = $client
+@onready var client: LobbyClient              = $client
 
 var active_mode: String                       = "snooker"
 var active_match: HBoxContainer               = null
@@ -52,7 +52,8 @@ func _on_match_create_bttn_pressed() -> void:
 		"type": active_mode
 	}
 
-	MessageBus.emit_request.rpc_id(1, "match_list_add_entry", match_entry)
+	#MessageBus.emit_request.rpc_id(1, "match_list_add_entry", match_entry)
+	MessageBus.emit_request.rpc("match_list_add_entry", match_entry)
 
 func _on_mode_bttn_pressed(button: Button) -> void:
 	active_mode = button.text.remove_chars("-").to_lower()

scenes/screens/lobby_screen/lobby_client.gd

@@ -0,0 +1,35 @@
+class_name LobbyClient extends ClientNetworking
+
+
+var lobby_fully_connected: bool = false
+
+
+func _ready() -> void:
+	pass
+
+func _process(_delta: float) -> void:
+	pass
+
+func _do_wait_for_connection() -> void:
+	_wait_for_connection()
+
+	while not lobby_fully_connected:
+		await get_tree().process_frame
+
+func _do_wait_close_connection():
+	_wait_close_connection()
+
+	lobby_fully_connected = false
+
+
+func client_connected_to_server() -> void:
+	push_warning("Connected to server!")
+
+
+func client_disconnected_from_server() -> void:
+	push_warning("Disconnected from, server...")
+
+func client_connection_failed_to_server() -> void:
+	push_warning("Connection failed!")
+
+	unset_client()

scenes/screens/lobby_screen/lobby_client.gd.uid

@@ -0,0 +1 @@
+uid://dv7j35h2ngiq7

scripts/client_networking.gd

@@ -17,8 +17,31 @@ func start_client(address: String = "127.0.0.1", port: int = 8080) -> void:
 	multiplayer.server_disconnected.connect(client_disconnected_from_server)
 	multiplayer.connection_failed.connect(client_connection_failed_to_server)
 
+
+func _wait_for_connection() -> void:
+	while not peer:
+		await get_tree().process_frame
+
+	while peer.get_connection_status() != 2:
+		await get_tree().process_frame
+
+func _wait_close_connection():
+	close_connection()
+
+	while peer:
+		await get_tree().process_frame
+
+
 func client_connected_to_server() -> void:
-	push_warning("Connected to server!")
+	assert(false, "This method needs to be overridden...")
+
+func client_disconnected_from_server() -> void:
+	assert(false, "This method needs to be overridden...")
+
+
+func client_connection_failed_to_server() -> void:
+	assert(false, "This method needs to be overridden...")
+
 
 func close_connection() -> void:
 	if not peer: return
@@ -27,13 +50,6 @@ func close_connection() -> void:
 
 	unset_client()
 
-func client_disconnected_from_server() -> void:
-	push_warning("Disconnected from, server...")
-
-func client_connection_failed_to_server() -> void:
-	push_warning("Connection failed!")
-
-	unset_client()
 
 func unset_client() -> void:
 	if not peer: return

scripts/server_networking.gd

@@ -1,4 +1,4 @@
-class_name Server extends Node
+class_name ServerNetworking extends Node
 
 
 var peer: ENetMultiplayerPeer