import threading from enum import Enum from modem_frametypes import FRAME_TYPE from codec2 import FREEDV_MODE import data_frame_factory import structlog import random from queue import Queue import time class States(Enum): NEW = 0 CONNECTING = 1 CONNECT_SENT = 2 CONNECT_ACK_SENT = 3 CONNECTED = 4 HEARTBEAT_SENT = 5 HEARTBEAT_ACK_SENT = 6 PAYLOAD_SENT = 7 DISCONNECTING = 8 DISCONNECTED = 9 FAILED = 10 class P2PConnection: STATE_TRANSITION = { States.NEW: { FRAME_TYPE.P2P_CONNECTION_CONNECT.value: 'connected_irs', }, States.CONNECTING: { FRAME_TYPE.P2P_CONNECTION_CONNECT_ACK.value: 'connected_iss', }, States.CONNECTED: { FRAME_TYPE.P2P_CONNECTION_CONNECT.value: 'connected_irs', FRAME_TYPE.P2P_CONNECTION_CONNECT_ACK.value: 'connected_iss', FRAME_TYPE.P2P_CONNECTION_PAYLOAD.value: 'received_data', FRAME_TYPE.P2P_CONNECTION_DISCONNECT.value: 'received_disconnect', }, States.PAYLOAD_SENT: { FRAME_TYPE.P2P_CONNECTION_PAYLOAD_ACK.value: 'transmitted_data', }, States.DISCONNECTING: { FRAME_TYPE.P2P_CONNECTION_DISCONNECT_ACK.value: 'received_disconnect_ack', }, States.DISCONNECTED: { FRAME_TYPE.P2P_CONNECTION_DISCONNECT.value: 'received_disconnect', FRAME_TYPE.P2P_CONNECTION_DISCONNECT_ACK.value: 'received_disconnect_ack', }, } def __init__(self, config: dict, modem, origin: str, destination: str, state_manager, socket_command_handler=None): self.logger = structlog.get_logger(type(self).__name__) self.config = config self.frame_factory = data_frame_factory.DataFrameFactory(self.config) self.socket_command_handler = socket_command_handler self.destination = destination self.origin = origin self.bandwidth = 0 self.states = state_manager self.modem = modem self.p2p_data_rx_queue = Queue() self.p2p_data_tx_queue = Queue() self.state = States.NEW self.session_id = self.generate_id() self.event_frame_received = threading.Event() self.RETRIES_CONNECT = 1 self.TIMEOUT_CONNECT = 10 self.TIMEOUT_DATA = 5 self.RETRIES_DATA = 5 self.ENTIRE_CONNECTION_TIMEOUT = 100 self.is_ISS = False # Indicator, if we are ISS or IRS self.last_data_timestamp= time.time() self.start_data_processing_worker() def start_data_processing_worker(self): """Starts a worker thread to monitor the transmit data queue and process data.""" def data_processing_worker(): while True: if time.time() > self.last_data_timestamp + self.ENTIRE_CONNECTION_TIMEOUT: self.disconnect() return if not self.p2p_data_tx_queue.empty() and self.state == States.CONNECTED: self.process_data_queue() threading.Event().wait(0.1) # Create and start the worker thread worker_thread = threading.Thread(target=data_processing_worker, daemon=True) worker_thread.start() def generate_id(self): while True: random_int = random.randint(1,255) if random_int not in self.states.p2p_connection_sessions: return random_int if len(self.states.p2p_connection_sessions) >= 255: return False def set_details(self, snr, frequency_offset): self.snr = snr self.frequency_offset = frequency_offset def log(self, message, isWarning = False): msg = f"[{type(self).__name__}][id={self.session_id}][state={self.state}][ISS={bool(self.is_ISS)}]: {message}" logger = self.logger.warn if isWarning else self.logger.info logger(msg) def set_state(self, state): if self.state == state: self.log(f"{type(self).__name__} state {self.state.name} unchanged.") else: self.log(f"{type(self).__name__} state change from {self.state.name} to {state.name}") self.state = state def on_frame_received(self, frame): self.last_data_timestamp = time.time() self.event_frame_received.set() self.log(f"Received {frame['frame_type']}") frame_type = frame['frame_type_int'] if self.state in self.STATE_TRANSITION: if frame_type in self.STATE_TRANSITION[self.state]: action_name = self.STATE_TRANSITION[self.state][frame_type] response = getattr(self, action_name)(frame) return self.log(f"Ignoring unknown transition from state {self.state.name} with frame {frame['frame_type']}") def transmit_frame(self, frame: bytearray, mode='auto'): self.log("Transmitting frame") if mode in ['auto']: mode = self.get_mode_by_speed_level(self.speed_level) self.modem.transmit(mode, 1, 1, frame) def transmit_wait_and_retry(self, frame_or_burst, timeout, retries, mode): while retries > 0: self.event_frame_received = threading.Event() if isinstance(frame_or_burst, list): burst = frame_or_burst else: burst = [frame_or_burst] for f in burst: self.transmit_frame(f, mode) self.event_frame_received.clear() self.log(f"Waiting {timeout} seconds...") if self.event_frame_received.wait(timeout): return self.log("Timeout!") retries = retries - 1 #self.connected_iss() # override connection state for simulation purposes self.session_failed() def launch_twr(self, frame_or_burst, timeout, retries, mode): twr = threading.Thread(target = self.transmit_wait_and_retry, args=[frame_or_burst, timeout, retries, mode], daemon=True) twr.start() def transmit_and_wait_irs(self, frame, timeout, mode): self.event_frame_received.clear() self.transmit_frame(frame, mode) self.log(f"Waiting {timeout} seconds...") #if not self.event_frame_received.wait(timeout): # self.log("Timeout waiting for ISS. Session failed.") # self.transmission_failed() def launch_twr_irs(self, frame, timeout, mode): thread_wait = threading.Thread(target = self.transmit_and_wait_irs, args = [frame, timeout, mode], daemon=True) thread_wait.start() def connect(self): self.set_state(States.CONNECTING) self.is_ISS = True session_open_frame = self.frame_factory.build_p2p_connection_connect(self.origin, self.destination, self.session_id) self.launch_twr(session_open_frame, self.TIMEOUT_CONNECT, self.RETRIES_CONNECT, mode=FREEDV_MODE.signalling) return def connected_iss(self): self.log("CONNECTED ISS...........................") self.set_state(States.CONNECTED) self.is_ISS = True if self.socket_command_handler: self.socket_command_handler.socket_respond_connected(self.origin, self.destination, self.bandwidth) def connected_irs(self, frame): self.log("CONNECTED IRS...........................") self.states.register_p2p_connection_session(self) self.set_state(States.CONNECTED) self.is_ISS = False self.orign = frame["origin"] self.destination = frame["destination_crc"] if self.socket_command_handler: self.socket_command_handler.socket_respond_connected(self.origin, self.destination, self.bandwidth) session_open_frame = self.frame_factory.build_p2p_connection_connect_ack(self.destination, self.origin, self.session_id) self.launch_twr_irs(session_open_frame, self.ENTIRE_CONNECTION_TIMEOUT, mode=FREEDV_MODE.signalling) def session_failed(self): self.set_state(States.FAILED) if self.socket_command_handler: self.socket_command_handler.socket_respond_disconnected() def process_data_queue(self, frame=None): if not self.p2p_data_tx_queue.empty(): print("processing data....") self.set_state(States.PAYLOAD_SENT) data = self.p2p_data_tx_queue.get() sequence_id = random.randint(0,255) data = data.encode('utf-8') if len(data) <= 11: mode = FREEDV_MODE.signalling payload = self.frame_factory.build_p2p_connection_payload(mode, self.session_id, sequence_id, data) self.launch_twr(payload, self.TIMEOUT_DATA, self.RETRIES_DATA, mode=mode) return def prepare_data_chunk(self, data, mode): return data def received_data(self, frame): print(frame) self.p2p_data_rx_queue.put(frame['data']) ack_data = self.frame_factory.build_p2p_connection_payload_ack(self.session_id, 0) self.launch_twr_irs(ack_data, self.ENTIRE_CONNECTION_TIMEOUT, mode=FREEDV_MODE.signalling) def transmit_data_ack(self, frame): print(frame) def transmitted_data(self, frame): print("transmitted data...") self.set_state(States.CONNECTED) def disconnect(self): if self.state not in [States.DISCONNECTING, States.DISCONNECTED]: self.set_state(States.DISCONNECTING) disconnect_frame = self.frame_factory.build_p2p_connection_disconnect(self.session_id) self.launch_twr(disconnect_frame, self.TIMEOUT_CONNECT, self.RETRIES_CONNECT, mode=FREEDV_MODE.signalling) return def received_disconnect(self, frame): self.log("DISCONNECTED...............") self.set_state(States.DISCONNECTED) if self.socket_command_handler: self.socket_command_handler.socket_respond_disconnected() self.is_ISS = False disconnect_ack_frame = self.frame_factory.build_p2p_connection_disconnect_ack(self.session_id) self.launch_twr_irs(disconnect_ack_frame, self.ENTIRE_CONNECTION_TIMEOUT, mode=FREEDV_MODE.signalling) def received_disconnect_ack(self, frame): self.log("DISCONNECTED...............") self.set_state(States.DISCONNECTED) if self.socket_command_handler: self.socket_command_handler.socket_respond_disconnected() def transmit_arq(self): pass #command = cmd_class(self.config, self.states, self.eve, params) #app.logger.info(f"Command {command.get_name()} running...") #if command.run(app.modem_events, app.service_manager.modem): def received_arq(self): pass