FreeDATA/modem/frame_handler.py

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import helpers
from event_manager import EventManager
from state_manager import StateManager
from queue import Queue
import structlog
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import time, uuid
from codec2 import FREEDV_MODE
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TESTMODE = False
class FrameHandler():
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def __init__(self, name: str, config, states: StateManager, event_manager: EventManager,
modem) -> None:
self.name = name
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self.config = config
self.states = states
self.event_manager = event_manager
self.modem = modem
self.logger = structlog.get_logger("Frame Handler")
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self.details = {
'frame' : None,
'snr' : 0,
'frequency_offset': 0,
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'freedv_inst': None,
'bytes_per_frame': 0
}
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def is_frame_for_me(self):
call_with_ssid = self.config['STATION']['mycall'] + "-" + str(self.config['STATION']['myssid'])
ft = self.details['frame']['frame_type']
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valid = False
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# Check for callsign checksum
if ft in ['ARQ_SESSION_OPEN', 'ARQ_SESSION_OPEN_ACK', 'PING', 'PING_ACK']:
valid, mycallsign = helpers.check_callsign(
call_with_ssid,
self.details["frame"]["destination_crc"],
self.config['STATION']['ssid_list'])
# Check for session id on IRS side
elif ft in ['ARQ_SESSION_INFO', 'ARQ_BURST_FRAME', 'ARQ_STOP']:
session_id = self.details['frame']['session_id']
if session_id in self.states.arq_irs_sessions:
valid = True
# Check for session id on ISS side
elif ft in ['ARQ_SESSION_INFO_ACK', 'ARQ_BURST_ACK', 'ARQ_STOP_ACK']:
session_id = self.details['frame']['session_id']
if session_id in self.states.arq_iss_sessions:
valid = True
else:
valid = False
if not valid:
self.logger.info(f"[Frame handler] {ft} received but not for us.")
return valid
def should_respond(self):
return self.is_frame_for_me()
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def add_to_activity_list(self):
frame = self.details['frame']
activity = {
"direction": "received",
"snr": self.details['snr'],
"frequency_offset": self.details['frequency_offset'],
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"activity_type": frame["frame_type"]
}
if "origin" in frame:
activity["origin"] = frame["origin"]
if "destination" in frame:
activity["destination"] = frame["destination"]
if "gridsquare" in frame:
activity["gridsquare"] = frame["gridsquare"]
if "session_id" in frame:
activity["session_id"] = frame["session_id"]
self.states.add_activity(activity)
def add_to_heard_stations(self):
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frame = self.details['frame']
if 'origin' not in frame:
return
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dxgrid = frame['gridsquare'] if 'gridsquare' in frame else "------"
helpers.add_to_heard_stations(
frame['origin'],
dxgrid,
self.name,
self.details['snr'],
self.details['frequency_offset'],
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self.states.radio_frequency,
self.states.heard_stations,
)
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def make_event(self):
event = {
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"type": "frame-handler",
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"received": self.details['frame']['frame_type'],
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"timestamp": int(time.time()),
"mycallsign": self.config['STATION']['mycall'],
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"myssid": self.config['STATION']['myssid'],
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"snr": str(self.details['snr']),
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}
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if 'origin' in self.details['frame']:
event['dxcallsign'] = self.details['frame']['origin']
return event
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def emit_event(self):
event_data = self.make_event()
self.event_manager.broadcast(event_data)
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def get_tx_mode(self):
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return FREEDV_MODE.signalling
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def transmit(self, frame):
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if not TESTMODE:
self.modem.transmit(self.get_tx_mode(), 1, 0, frame)
else:
self.event_manager.broadcast(frame)
def follow_protocol(self):
pass
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def log(self):
self.logger.info(f"[Frame Handler] Handling frame {self.details['frame']['frame_type']}")
def handle(self, frame, snr, frequency_offset, freedv_inst, bytes_per_frame):
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self.details['frame'] = frame
self.details['snr'] = snr
self.details['frequency_offset'] = frequency_offset
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self.details['freedv_inst'] = freedv_inst
self.details['bytes_per_frame'] = bytes_per_frame
self.log()
self.add_to_heard_stations()
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self.add_to_activity_list()
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self.emit_event()
self.follow_protocol()