231 lines
9 KiB
GDScript3
231 lines
9 KiB
GDScript3
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# Class to manage low level communication with khaganat
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#
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# Copyright (C) 2019 AleaJactaEst
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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# https://godotengine.org/qa/20026/to-send-a-udp-packet-godot-3
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extends Control
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enum TCONNECTIONSTATE {
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NOTINITIALISED = 0, # nothing happened yet
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NOTCONNECTED = 1, # init() called
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AUTHENTICATE = 2, # connect() called, identified by the login server
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LOGIN = 3, # connecting to the frontend, sending identification
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SYNCHRONIZE = 4, # connection accepted by the frontend, synchronizing
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CONNECTED = 5, # synchronized, connected, ready to work
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PROBE = 6, # connection lost by frontend, probing for response
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STALLED = 7, # server is stalled
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DISCONNECT = 8, # disconnect() called, or timeout, or connection closed by frontend
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QUIT = 9}
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enum CLFECOMMON {
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SYSTEM_LOGIN_CODE = 0,
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SYSTEM_SYNC_CODE = 1,
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SYSTEM_ACK_SYNC_CODE = 2,
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SYSTEM_PROBE_CODE = 3,
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SYSTEM_ACK_PROBE_CODE = 4,
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SYSTEM_DISCONNECTION_CODE = 5,
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SYSTEM_STALLED_CODE = 6,
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SYSTEM_SERVER_DOWN_CODE = 7,
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SYSTEM_QUIT_CODE = 8,
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SYSTEM_ACK_QUIT_CODE = 9,
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NUMBITSINLONGACK = 512}
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var _connection_state
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var _socketUDP
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var _user_addr
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var _user_key
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var _user_id
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var _current_received_number
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var _last_received_number
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var _confirmed_received_number
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var _last_ack_bit
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var _ack_bit_mask
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var _long_ack_bit_field
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var _last_ack_in_long_ack
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var _latest_sync
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var _queue_message_system
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func _ready():
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_current_received_number = 0
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_last_received_number = 0
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_confirmed_received_number = 0
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_last_ack_bit = 0
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_ack_bit_mask = 0
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_connection_state = TCONNECTIONSTATE.NOTINITIALISED
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_socketUDP = PacketPeerUDP.new()
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_queue_message_system = Array()
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_long_ack_bit_field = preload("res://bitset.gdns").new()
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_last_ack_in_long_ack = 0
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_latest_sync = 0
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func send_system_login(user_addr, user_key, user_id, lang):
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var msgout = preload("res://bitstream.gdns").new()
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msgout.put_sint32(_current_received_number)
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msgout.put_bool(true)
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msgout.put_uint8(CLFECOMMON.SYSTEM_LOGIN_CODE)
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msgout.put_string_hexa32(user_addr)
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msgout.put_string_hexa32(user_key)
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msgout.put_string_hexa32(user_id)
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msgout.put_string(lang)
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print("[net_low_level:send_system_login] Send System Login :" + msgout.show())
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var res = _socketUDP.put_packet(msgout.get_data())
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if ( res != OK):
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print("[net_low_level:send_system_login] Error to send system login : " + str(res))
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return
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_connection_state = TCONNECTIONSTATE.CONNECTED
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func send_system_sync():
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var msgout = preload("res://bitstream.gdns").new()
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var curtime = OS.get_ticks_msec()
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msgout.put_uint8(CLFECOMMON.SYSTEM_ACK_SYNC_CODE)
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msgout.put_sint32(_last_received_number)
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msgout.put_sint32(_last_ack_in_long_ack)
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_long_ack_bit_field.write_serial(msgout)
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msgout.put_sint32(_latest_sync)
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_queue_message_system.append(msgout)
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func send_systemm_disconnect():
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var msgout = preload("res://bitstream.gdns").new()
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msgout.put_sint32(_current_received_number)
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msgout.put_bool(true)
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msgout.put_uint8(CLFECOMMON.SYSTEM_DISCONNECTION_CODE)
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var res = _socketUDP.put_packet(msgout.get_data())
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_connection_state == TCONNECTIONSTATE.QUIT
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if ( res != OK):
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print("[net_low_level:send_systemm_disconnect] Error to send system disconnection : " + str(res))
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return
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func disconnect_server():
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print("[net_low_level:disconnect_server] Disconnect")
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if _socketUDP:
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send_systemm_disconnect()
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print("[net_low_level:disconnect_server] Send disconnect to server")
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_socketUDP.close()
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func connect_to_server(user_addr, user_key, user_id):
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var connexion = load("res://assets/Scripts/Config/connexion.gd").connexion.new()
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var khaganat_host = connexion.get_khaganat_host()
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var khaganat_port = connexion.get_khaganat_port()
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var lang = connexion.get_language()
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print("[net_low_level:connect_to_server] prepare:" + str(khaganat_host) + ":" + str(khaganat_port))
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_socketUDP.set_dest_address(khaganat_host, khaganat_port)
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send_system_login(user_addr, user_key, user_id, lang)
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func analyze_message_received(msgbytes):
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var msgin = preload("res://bitstream.gdns").new()
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msgin.put_data(msgbytes)
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#if msgin.size() == 0:
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# return
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_current_received_number = msgin.get_sint32()
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var system_mode = msgin.get_bool()
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print("[net_low_level:analyze_message_received] Tick:" + str(_current_received_number) + ", Mode:" + str(system_mode) + ", Size:" + str(msgin.size()))
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if system_mode:
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print("[net_low_level:analyze_message_received] System Mode")
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if _current_received_number > _last_received_number + 1:
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print("[net_low_level:analyze_message_received] lost message : " + str(_last_received_number + 1 - _current_received_number))
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elif _current_received_number == _last_received_number:
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print("[net_low_level:analyze_message_received] Server re-send last message")
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return
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elif _current_received_number < _last_received_number:
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print("[net_low_level:analyze_message_received] Server re-send old message")
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return
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var ackBool = false
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var ackBit = 0
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if not system_mode:
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match _connection_state:
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TCONNECTIONSTATE.CONNECTED:
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ackBool = true
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ackBit = 1
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TCONNECTIONSTATE.SYNCHRONIZE:
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ackBool = true
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ackBit = 1
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_:
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ackBool = false
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if _current_received_number - _last_received_number < 32:
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_ack_bit_mask <<= _current_received_number - _last_received_number
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_ack_bit_mask |= _last_ack_bit << (_current_received_number - _last_received_number - 1)
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elif (_current_received_number - _last_received_number) == 32 and _last_ack_bit != 0:
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_ack_bit_mask = 0x80000000
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else:
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_ack_bit_mask = 0x00000000
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_last_ack_bit = ackBit
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for i in range(_last_received_number + 1, _current_received_number):
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_long_ack_bit_field.clear_bit(i & 511) # (512 - 1) mask 9bit
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_long_ack_bit_field.put(_current_received_number & 511, ackBool) # (512 - 1) mask 9bit
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if _last_ack_in_long_ack <= (_last_received_number - 512):
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_last_ack_in_long_ack = _last_received_number - 511 # (512 - 1) mask 9bit
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print("[net_low_level:analyze_message_received] _last_ack_in_long_ack:" + str(_last_ack_in_long_ack) + ", _long_ack_bit_field:" + _long_ack_bit_field.show())
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var message = msgin.get_uint8()
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print("[net_low_level:analyze_message_received] Message type:" + str(message) )
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match message:
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CLFECOMMON.SYSTEM_LOGIN_CODE:
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pass
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CLFECOMMON.SYSTEM_SYNC_CODE:
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var synchronize = msgin.get_uint32()
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var stime = msgin.get_sint64()
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_latest_sync = msgin.get_uint32()
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var msg_xml = msgin.get_array_uint8(16)
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var database_xml = msgin.get_array_uint8(16)
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print("[net_low_level:analyze_message_received] synchronize:" + str(synchronize) + " stime:" + str(stime) + " latest_sync:" + str(_latest_sync))
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var num = ""
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for item in msg_xml:
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num += str(item) + "."
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print(num)
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num = ""
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for item in database_xml:
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num += str(item) + "."
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print(num)
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send_system_sync()
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CLFECOMMON.SYSTEM_STALLED_CODE:
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pass
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CLFECOMMON.SYSTEM_PROBE_CODE:
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pass
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CLFECOMMON.SYSTEM_SERVER_DOWN_CODE:
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pass
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_:
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print("[net_low_level:analyze_message_received] Message type unknown (" + str(message) + ")")
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_last_received_number = _current_received_number
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func _process(delta):
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if _connection_state == TCONNECTIONSTATE.NOTINITIALISED:
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return
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if _connection_state == TCONNECTIONSTATE.NOTCONNECTED:
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return
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if _connection_state == TCONNECTIONSTATE.QUIT:
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return
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if _queue_message_system.size() > 0:
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var msgout = _queue_message_system.pop_front()
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print("[net_low_level:_process] Send data system")
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_socketUDP.put_packet(msgout.get_data())
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if _socketUDP.get_available_packet_count() == 0:
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return
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var msgbytes = _socketUDP.get_packet()
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if msgbytes.size() > 0:
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analyze_message_received(msgbytes)
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func _exit_tree():
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disconnect_server()
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