Attempt to using Nakama as replacement of Low-Level ENet

addons/com.heroiclabs.nakama/utils/NakamaMultiplayerPeer.gd

@@ -0,0 +1,97 @@
+extends MultiplayerPeerExtension
+class_name NakamaMultiplayerPeer
+
+const MAX_PACKET_SIZE := 1 << 24
+
+var _self_id := 0
+var _connection_status: ConnectionStatus = CONNECTION_DISCONNECTED
+var _refusing_new_connections := false
+var _target_id := 0
+
+class Packet extends RefCounted:
+	var data: PackedByteArray
+	var from: int
+
+	func _init(p_data: PackedByteArray, p_from: int) -> void:
+		data = p_data
+		from = p_from
+
+var _incoming_packets := []
+
+signal packet_generated (peer_id, buffer)
+
+func _get_packet_script() -> PackedByteArray:
+	if _incoming_packets.size() == 0:
+		return PackedByteArray()
+	return _incoming_packets.pop_front().data
+
+func _get_packet_mode() -> TransferMode:
+	return TRANSFER_MODE_RELIABLE
+
+func _get_packet_channel() -> int:
+	return 0
+
+func _put_packet_script(p_buffer: PackedByteArray) -> Error:
+	packet_generated.emit(_target_id, p_buffer)
+	return OK
+
+func _get_available_packet_count() -> int:
+	return _incoming_packets.size()
+
+func _get_max_packet_size() -> int:
+	return MAX_PACKET_SIZE
+
+func _set_transfer_channel(p_channel) -> void:
+	pass
+
+func _get_transfer_channel() -> int:
+	return 0
+
+func _set_transfer_mode(p_mode: TransferMode) -> void:
+	pass
+
+func _get_transfer_mode() -> TransferMode:
+	return TRANSFER_MODE_RELIABLE
+
+func _set_target_peer(p_peer_id: int) -> void:
+	_target_id = p_peer_id
+
+func _get_packet_peer() -> int:
+	if _connection_status != CONNECTION_CONNECTED:
+		return 1
+	if _incoming_packets.size() == 0:
+		return 1
+
+	return _incoming_packets[0].from
+
+func _is_server() -> bool:
+	return _self_id == 1
+
+func _poll() -> void:
+	pass
+
+func _get_unique_id() -> int:
+	return _self_id
+
+func _set_refuse_new_connections(p_enable: bool) -> void:
+	_refusing_new_connections = p_enable
+
+func _is_refusing_new_connections() -> bool:
+	return _refusing_new_connections
+
+func _get_connection_status() -> ConnectionStatus:
+	return _connection_status
+
+func initialize(p_self_id: int) -> void:
+	if _connection_status != CONNECTION_CONNECTING:
+		return
+	_self_id = p_self_id
+	if _self_id == 1:
+		_connection_status = CONNECTION_CONNECTED
+
+func set_connection_status(p_connection_status: int) -> void:
+	_connection_status = p_connection_status
+
+func deliver_packet(p_data: PackedByteArray, p_from_peer_id: int) -> void:
+	var packet = Packet.new(p_data, p_from_peer_id);
+	_incoming_packets.push_back(packet)