mirror of
https://github.com/DJ2LS/FreeDATA
synced 2024-05-14 08:04:33 +00:00
127 lines
4.1 KiB
Python
127 lines
4.1 KiB
Python
import threading
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import data_frame_factory
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import queue
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import random
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from codec2 import FREEDV_MODE
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import arq_session
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class ARQSessionISS(arq_session.ARQSession):
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STATE_DISCONNECTED = 0
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STATE_CONNECTING = 1
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STATE_CONNECTED = 2
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STATE_SENDING = 3
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STATE_ENDED = 10
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RETRIES_CONNECT = 3
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RETRIES_TRANSFER = 3
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TIMEOUT_CONNECT_ACK = 5
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TIMEOUT_TRANSFER = 2
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def __init__(self, config: dict, tx_frame_queue: queue.Queue, dxcall: str, data: bytearray):
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super().__init__(config, tx_frame_queue, dxcall)
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self.data = data
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self.state = self.STATE_DISCONNECTED
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self.id = self.generate_id()
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self.event_connection_ack_received = threading.Event()
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self.event_transfer_ack_received = threading.Event()
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self.frame_factory = data_frame_factory.DataFrameFactory(self.config)
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def generate_id(self):
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return random.randint(1,255)
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def set_state(self, state):
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self.logger.info(f"ARQ Session {self.id} state {self.state}")
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self.state = state
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def runner(self):
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if not self.connect():
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return False
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return self.send_data()
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def run(self):
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self.thread = threading.Thread(target=self.runner, name=f"ARQ ISS Session {self.id}", daemon=True)
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self.thread.run()
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def connect(self):
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self.state = self.STATE_CONNECTING
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connect_frame = self.frame_factory.build_arq_session_connect(True, self.dxcall, self.id)
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retries = self.RETRIES_CONNECT
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while retries > 0:
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self.transmit_frame(connect_frame)
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self.logger.info("Waiting for CONN ACK...")
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if self.event_connection_ack_received.wait(self.TIMEOUT_CONNECT_ACK):
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self.setState(self.STATE_CONNECTED)
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return True
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retries = retries - 1
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self.setState(self.STATE_DISCONNECTED)
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return False
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def on_connection_ack_received(self, ack):
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if self.state != self.STATE_CONNECTING:
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raise RuntimeError(f"ARQ Session: Received connection ACK while in state {self.state}")
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self.speed_level = ack['speed_level']
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self.event_connection_ack_received.set()
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# Sends the full payload in multiple frames
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def send_data(self):
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# Todo make this n frames per burst stuff part of the protocol again
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# hard coding n frames per burst to 1 for now.
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n_frames_per_burst = 1
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n_frame = 1
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offset = 0
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while offset < len(self.data):
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max_size = self.get_payload_size(self.speed_level)
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end_offset = min(len(self.data), max_size)
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frame_payload = self.data[offset:end_offset]
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data_frame = self.frame_factory.build_arq_data_frame(self.id, n_frames_per_burst, max_size, n_frame, frame_payload)
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self.set_state(self.STATE_SENDING)
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if not self.send_arq(data_frame):
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return False
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offset = end_offset + 1
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# Send part of the payload using ARQ
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def send_arq(self, frame):
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retries = self.RETRIES_TRANSFER
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while retries > 0:
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# to know later if it has changed
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speed_level = self.speed_level
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self.transmit_frame(frame)
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# wait for ack
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if self.event_transfer_ack_received.wait(self.TIMEOUT_TRANSFER):
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speed_level = self.speed_level
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return True
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# don't decrement retries if speed level is changing
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if self.speed_level == speed_level:
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retries = retries - 1
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self.set_state(self.STATE_DISCONNECTED)
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return False
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def on_transfer_ack_received(self, ack):
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self.event_transfer_ack_received.set()
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self.speed_level = ack['speed_level']
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def on_transfer_nack_received(self, nack):
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self.speed_level = nack['speed_level']
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def on_disconnect_received(self):
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self.abort()
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def abort(self):
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self.state = self.STATE_DISCONNECTED
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self.event_connection_ack_received.set()
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self.event_connection_ack_received.clear()
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self.event_transfer_feedback.set()
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self.event_transfer_feedback.clear()
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