Add a proper server logic without lobby

scenes/utils/menus/main/main_menu.gd

@@ -0,0 +1,60 @@
+extends Node
+
+var player_manager: PlayerManager = PlayerManager.new()
+
+# Called when the node enters the scene tree for the first time.
+func _ready() -> void:
+	var map_dir := DirAccess.open("res://scenes/maps/maps/")
+	
+	if map_dir:
+		map_dir.list_dir_begin()
+		var file_name = map_dir.get_next()
+		while file_name != "":
+			$UI/CreateServer/Maps.add_item(file_name)
+			file_name = map_dir.get_next()
+
+# Called every frame. 'delta' is the elapsed time since the previous frame.
+func _process(delta: float) -> void:
+	pass
+
+
+func _on_create_server_pressed() -> void:
+	$UI/CreateServer.visible = true
+	
+func _on_join_server_pressed() -> void:
+	$UI/JoinServer.visible = true
+
+
+
+func _on_create_button_pressed() -> void:
+	var chosen_map_index = $UI/CreateServer/Maps.get_selected_items()[0]
+	var chosen_map = $UI/CreateServer/Maps.get_item_text(chosen_map_index)
+	var path_tmpl := "res://scenes/maps/maps/%s"
+	var path := path_tmpl % chosen_map
+	GameServerManager.current_map = path
+	var err := GameServerManager.create_server(player_manager)
+	if err != OK:
+		print("couldn't create a server")
+	$UI.hide()
+	change_level.call_deferred(load(path))
+
+# Call this function deferred and only on the main authority (server).
+func change_level(scene: PackedScene):
+	
+	# Remove old level if any.
+	var level = $LevelLoader/CurrentLevel
+	for c in level.get_children():
+		level.remove_child(c)
+		c.queue_free()
+	# Add new level.
+	level.add_child(scene.instantiate())
+
+
+func _on_text_edit_text_changed() -> void:
+	player_manager.name = $UI/TextEdit.text
+
+
+func _on_join_button_pressed() -> void:
+	$UI.hide()	
+	GameServerManager.join_server(player_manager, $UI/JoinServer/IP.text, $UI/JoinServer/Port.text.to_int())
+	

scenes/utils/menus/main/main_menu.tscn

@@ -0,0 +1,145 @@
+[gd_scene load_steps=2 format=3 uid="uid://s48rpcadnn47"]
+
+[ext_resource type="Script" path="res://scenes/utils/menus/main/main_menu.gd" id="1_yi7ba"]
+
+[node name="MainMenu" type="Control"]
+layout_mode = 3
+anchors_preset = 15
+anchor_right = 1.0
+anchor_bottom = 1.0
+grow_horizontal = 2
+grow_vertical = 2
+script = ExtResource("1_yi7ba")
+
+[node name="LevelLoader" type="Node3D" parent="."]
+
+[node name="CurrentLevel" type="Node3D" parent="LevelLoader"]
+
+[node name="MultiplayerSpawner" type="MultiplayerSpawner" parent="LevelLoader"]
+_spawnable_scenes = PackedStringArray("res://scenes/maps/maps/lowpoly_tdm_2.tscn")
+spawn_path = NodePath("../CurrentLevel")
+spawn_limit = 1
+
+[node name="UI" type="Control" parent="."]
+layout_mode = 1
+anchors_preset = 15
+anchor_right = 1.0
+anchor_bottom = 1.0
+grow_horizontal = 2
+grow_vertical = 2
+
+[node name="MainButtons" type="Control" parent="UI"]
+layout_mode = 1
+anchors_preset = 10
+anchor_right = 1.0
+grow_horizontal = 2
+
+[node name="CreateServer" type="Button" parent="UI/MainButtons"]
+layout_mode = 1
+anchors_preset = 5
+anchor_left = 0.5
+anchor_right = 0.5
+offset_left = -4.0
+offset_right = 4.0
+offset_bottom = 8.0
+grow_horizontal = 2
+text = "Create Server"
+
+[node name="JoinServer" type="Button" parent="UI/MainButtons"]
+layout_mode = 1
+anchors_preset = 5
+anchor_left = 0.5
+anchor_right = 0.5
+offset_left = 90.0
+offset_top = 3.0
+offset_right = 203.0
+offset_bottom = 34.0
+grow_horizontal = 2
+text = "Join Server"
+
+[node name="CreateServer" type="Control" parent="UI"]
+visible = false
+layout_mode = 1
+anchors_preset = 11
+anchor_left = 1.0
+anchor_right = 1.0
+anchor_bottom = 1.0
+offset_left = -512.0
+grow_horizontal = 0
+grow_vertical = 2
+
+[node name="Maps" type="ItemList" parent="UI/CreateServer"]
+layout_mode = 1
+anchors_preset = 8
+anchor_left = 0.5
+anchor_top = 0.5
+anchor_right = 0.5
+anchor_bottom = 0.5
+offset_left = -214.0
+offset_top = -905.0
+offset_right = 234.0
+offset_bottom = -386.0
+grow_horizontal = 2
+grow_vertical = 2
+
+[node name="CreateButton" type="Button" parent="UI/CreateServer"]
+layout_mode = 0
+offset_left = 236.0
+offset_top = 643.0
+offset_right = 282.0
+offset_bottom = 674.0
+text = "Start"
+
+[node name="JoinServer" type="Control" parent="UI"]
+visible = false
+layout_mode = 1
+anchors_preset = 11
+anchor_left = 1.0
+anchor_right = 1.0
+anchor_bottom = 1.0
+offset_left = -567.0
+grow_horizontal = 0
+grow_vertical = 2
+
+[node name="JoinButton" type="Button" parent="UI/JoinServer"]
+layout_mode = 0
+offset_left = 205.0
+offset_top = 187.0
+offset_right = 251.0
+offset_bottom = 218.0
+text = "Start"
+
+[node name="IP" type="TextEdit" parent="UI/JoinServer"]
+layout_mode = 1
+anchors_preset = 5
+anchor_left = 0.5
+anchor_right = 0.5
+offset_left = -240.5
+offset_right = 240.5
+offset_bottom = 58.0
+grow_horizontal = 2
+text = "127.0.0.1"
+
+[node name="Port" type="TextEdit" parent="UI/JoinServer"]
+layout_mode = 1
+anchors_preset = 5
+anchor_left = 0.5
+anchor_right = 0.5
+offset_left = -230.0
+offset_top = 69.0
+offset_right = 228.0
+offset_bottom = 129.0
+grow_horizontal = 2
+text = "27015"
+
+[node name="TextEdit" type="TextEdit" parent="UI"]
+layout_mode = 1
+offset_right = 481.0
+offset_bottom = 58.0
+text = "Player Name"
+
+[connection signal="pressed" from="UI/MainButtons/CreateServer" to="." method="_on_create_server_pressed"]
+[connection signal="pressed" from="UI/MainButtons/JoinServer" to="." method="_on_join_server_pressed"]
+[connection signal="pressed" from="UI/CreateServer/CreateButton" to="." method="_on_create_button_pressed"]
+[connection signal="pressed" from="UI/JoinServer/JoinButton" to="." method="_on_join_button_pressed"]
+[connection signal="text_changed" from="UI/TextEdit" to="." method="_on_text_edit_text_changed"]