net: add NetworkManager autoload with ENet server/client and welcome RPC

ruf-der-pilze/scripts/network_manager.gd

@@ -0,0 +1,62 @@
+extends Node
+
+signal peer_connected(id: int)
+signal peer_disconnected(id: int)
+signal connected_to_server()
+signal connection_failed()
+
+var peers: Dictionary = {}
+var my_id: int = 0
+
+
+func start_server(port: int, max_clients: int) -> void:
+	var peer := ENetMultiplayerPeer.new()
+	var err := peer.create_server(port, max_clients)
+	if err != OK:
+		push_error("[Server] Port %d konnte nicht gebunden werden: %s" % [port, error_string(err)])
+		return
+	multiplayer.multiplayer_peer = peer
+	multiplayer.peer_connected.connect(_on_peer_connected)
+	multiplayer.peer_disconnected.connect(_on_peer_disconnected)
+	print("[Server] Gestartet auf Port %d" % port)
+
+
+func join_server(ip: String, port: int) -> void:
+	var peer := ENetMultiplayerPeer.new()
+	var err := peer.create_client(ip, port)
+	if err != OK:
+		push_error("[Client] Verbindung zu %s:%d fehlgeschlagen: %s" % [ip, port, error_string(err)])
+		return
+	multiplayer.multiplayer_peer = peer
+	multiplayer.connected_to_server.connect(_on_connected_to_server)
+	multiplayer.connection_failed.connect(_on_connection_failed)
+
+
+func _on_peer_connected(id: int) -> void:
+	peers[id] = {}
+	peer_connected.emit(id)
+	print("[Server] Peer verbunden: %d" % id)
+	welcome.rpc_id(id, id)
+
+
+func _on_peer_disconnected(id: int) -> void:
+	peers.erase(id)
+	peer_disconnected.emit(id)
+	print("[Server] Peer getrennt: %d" % id)
+
+
+func _on_connected_to_server() -> void:
+	my_id = multiplayer.get_unique_id()
+	connected_to_server.emit()
+	print("[Client] Verbunden. Meine peer_id: %d" % my_id)
+
+
+func _on_connection_failed() -> void:
+	connection_failed.emit()
+	push_error("[Client] Verbindung fehlgeschlagen")
+
+
+@rpc("authority", "call_remote", "reliable")
+func welcome(peer_id: int) -> void:
+	# call_remote: wird NUR auf dem Ziel-Client ausgeführt, nicht auf dem Server.
+	print("[Client] Willkommen, meine peer_id ist: %d" % peer_id)