FreeDATA/freedata_server/arq_session.py
2024-05-11 20:18:21 +02:00

198 lines
7.1 KiB
Python

import datetime
import threading
import codec2
import data_frame_factory
import structlog
from event_manager import EventManager
from modem_frametypes import FRAME_TYPE
import time
from arq_data_type_handler import ARQDataTypeHandler
class ARQSession:
SPEED_LEVEL_DICT = {
0: {
'mode': codec2.FREEDV_MODE.datac4,
'min_snr': -10,
'duration_per_frame': 5.17,
'bandwidth': 250,
},
1: {
'mode': codec2.FREEDV_MODE.data_ofdm_500,
'min_snr': 0,
'duration_per_frame': 3.19,
'bandwidth': 500,
},
2: {
'mode': codec2.FREEDV_MODE.datac1,
'min_snr': 3,
'duration_per_frame': 4.18,
'bandwidth': 1700,
},
3: {
'mode': codec2.FREEDV_MODE.data_ofdm_2438,
'min_snr': 8.5,
'duration_per_frame': 5.5,
'bandwidth': 2438,
},
#4: {
# 'mode': codec2.FREEDV_MODE.qam16c2,
# 'min_snr': 11,
# 'duration_per_frame': 2.8,
# 'bandwidth': 2438,
#},
}
def __init__(self, config: dict, modem, dxcall: str, state_manager):
self.logger = structlog.get_logger(type(self).__name__)
self.config = config
self.event_manager: EventManager = modem.event_manager
#self.states = freedata_server.states
self.states = state_manager
self.states.setARQ(True)
self.protocol_version = 1
self.snr = []
self.dxcall = dxcall
self.dx_snr = []
self.modem = modem
self.speed_level = 0
self.previous_speed_level = 0
self.frames_per_burst = 1
self.frame_factory = data_frame_factory.DataFrameFactory(self.config)
self.event_frame_received = threading.Event()
self.arq_data_type_handler = ARQDataTypeHandler(self.event_manager, self.states)
self.id = None
self.session_started = time.time()
self.session_ended = 0
self.session_max_age = 500
# histogram lists for storing statistics
self.snr_histogram = []
self.bpm_histogram = []
self.time_histogram = []
def log(self, message, isWarning=False):
msg = f"[{type(self).__name__}][id={self.id}][state={self.state}]: {message}"
logger = self.logger.warn if isWarning else self.logger.info
logger(msg)
def get_mode_by_speed_level(self, speed_level):
return self.SPEED_LEVEL_DICT[speed_level]["mode"]
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 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 get_data_payload_size(self):
return self.frame_factory.get_available_data_payload_for_mode(
FRAME_TYPE.ARQ_BURST_FRAME,
self.SPEED_LEVEL_DICT[self.speed_level]["mode"]
)
def set_details(self, snr, frequency_offset):
self.snr = snr
self.frequency_offset = frequency_offset
def on_frame_received(self, frame):
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 and frame_type in self.STATE_TRANSITION[self.state]:
action_name = self.STATE_TRANSITION[self.state][frame_type]
received_data, type_byte = getattr(self, action_name)(frame)
if isinstance(received_data, bytearray) and isinstance(type_byte, int):
self.arq_data_type_handler.dispatch(type_byte, received_data, self.update_histograms(len(received_data), len(received_data)))
return
self.log(f"Ignoring unknown transition from state {self.state.name} with frame {frame['frame_type']}")
def is_session_outdated(self):
session_alivetime = time.time() - self.session_max_age
return self.session_ended < session_alivetime and self.state.name in [
'FAILED',
'ENDED',
'ABORTED',
]
def calculate_session_duration(self):
if self.session_ended == 0:
return time.time() - self.session_started
return self.session_ended - self.session_started
def calculate_session_statistics(self, confirmed_bytes, total_bytes):
duration = self.calculate_session_duration()
# total_bytes = self.total_length
# self.total_length
duration_in_minutes = duration / 60 # Convert duration from seconds to minutes
# Calculate bytes per minute
if duration_in_minutes > 0:
bytes_per_minute = int(confirmed_bytes / duration_in_minutes)
else:
bytes_per_minute = 0
# Convert histograms lists to dictionaries
time_histogram_dict = dict(enumerate(self.time_histogram))
snr_histogram_dict = dict(enumerate(self.snr_histogram))
bpm_histogram_dict = dict(enumerate(self.bpm_histogram))
return {
'total_bytes': total_bytes,
'duration': duration,
'bytes_per_minute': bytes_per_minute,
'time_histogram': time_histogram_dict,
'snr_histogram': snr_histogram_dict,
'bpm_histogram': bpm_histogram_dict,
}
def update_histograms(self, confirmed_bytes, total_bytes):
stats = self.calculate_session_statistics(confirmed_bytes, total_bytes)
self.snr_histogram.append(self.snr)
self.bpm_histogram.append(stats['bytes_per_minute'])
self.time_histogram.append(datetime.datetime.now().isoformat())
# Limit the size of each histogram to the last 20 entries
self.snr_histogram = self.snr_histogram[-20:]
self.bpm_histogram = self.bpm_histogram[-20:]
self.time_histogram = self.time_histogram[-20:]
return stats
def get_appropriate_speed_level(self, snr, maximum_bandwidth=None):
if maximum_bandwidth is None:
maximum_bandwidth = self.config['MODEM']['maximum_bandwidth']
# Adjust maximum_bandwidth based on special conditions or invalid configurations
if maximum_bandwidth == 0:
# Use the maximum available bandwidth from the speed level dictionary
maximum_bandwidth = max(details['bandwidth'] for details in self.SPEED_LEVEL_DICT.values())
# Initialize appropriate_speed_level to the lowest level that meets the minimum criteria
appropriate_speed_level = min(self.SPEED_LEVEL_DICT.keys())
for level, details in self.SPEED_LEVEL_DICT.items():
if snr >= details['min_snr'] and details['bandwidth'] <= maximum_bandwidth and level > appropriate_speed_level:
appropriate_speed_level = level
return appropriate_speed_level