kopia lustrzana https://github.com/projecthorus/radiosonde_auto_rx
103 wiersze
3.6 KiB
Python
103 wiersze
3.6 KiB
Python
#!/usr/bin/env python
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#
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# radiosonde_auto_rx - Radiosonde-Type Specific Functions
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#
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# Copyright (C) 2019 Mark Jessop <vk5qi@rfhead.net>
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# Released under GNU GPL v3 or later
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#
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import datetime
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import hashlib
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from dateutil.parser import parse
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def fix_datetime(datetime_str, local_dt_str = None):
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'''
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Given a HH:MM:SS string from a telemetry sentence, produce a complete timestamp, using the current system time as a guide for the date.
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'''
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if local_dt_str is None:
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_now = datetime.datetime.utcnow()
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else:
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_now = parse(local_dt_str)
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# Are we in the rollover window?
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if _now.hour == 23 or _now.hour == 0:
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_outside_window = False
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else:
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_outside_window = True
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# Parsing just a HH:MM:SS will return a datetime object with the year, month and day replaced by values in the 'default'
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# argument.
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_imet_dt = parse(datetime_str, default=_now)
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if _outside_window:
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# We are outside the day-rollover window, and can safely use the current zulu date.
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return _imet_dt
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else:
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# We are within the window, and need to adjust the day backwards or forwards based on the sonde time.
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if _imet_dt.hour == 23 and _now.hour == 0:
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# Assume system clock running slightly fast, and subtract a day from the telemetry date.
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_imet_dt = _imet_dt - datetime.timedelta(days=1)
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elif _imet_dt.hour == 00 and _now.hour == 23:
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# System clock running slow. Add a day.
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_imet_dt = _imet_dt + datetime.timedelta(days=1)
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return _imet_dt
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#
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# iMet Radiosonde Functions
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#
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def imet_unique_id(telemetry, custom=""):
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'''
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Generate a 'unique' imet radiosonde ID based on the power-on time, frequency, and an optional location code.
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This requires the following fields be present in the telemetry dict:
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datetime_dt (datetime) (will need to be generated above)
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frame (int) - Frame number
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freq (str) - Frequency, as "%.3f MHz"
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'''
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_imet_dt = telemetry['datetime_dt']
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# Determine power on time: Current time - number of frames (one frame per second)
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_power_on_time = _imet_dt - datetime.timedelta(seconds=telemetry['frame'])
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# Now we generate a string to hash based on the power-on time, the frequency, and the custom field.
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_temp_str = _power_on_time.strftime("%Y-%m-%dT%H:%M:%SZ") + telemetry['freq'] + custom
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# Calculate a SHA256 hash of the
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_hash = hashlib.sha256(_temp_str.encode('ascii')).hexdigest().upper()
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return "IMET-" + _hash[-8:]
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if __name__ == "__main__":
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# Testing scripts for the above.
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test_data = [
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{'datetime':'23:59:58', 'frame': 50, 'freq': '402.000 MHz', 'local_dt': "2019-03-01T23:59:58Z"},
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{'datetime':'23:59:58', 'frame': 50, 'freq': '402.000 MHz', 'local_dt': "2019-03-01T23:59:57Z"},
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{'datetime':'23:59:58', 'frame': 50, 'freq': '402.000 MHz', 'local_dt': "2019-03-02T00:00:03Z"},
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{'datetime':'00:00:00', 'frame': 52, 'freq': '402.000 MHz', 'local_dt': "2019-03-01T23:59:57Z"},
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{'datetime':'00:00:00', 'frame': 52, 'freq': '402.000 MHz', 'local_dt': "2019-03-02T00:00:03Z"},
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{'datetime':'00:00:01', 'frame': 53, 'freq': '402.000 MHz', 'local_dt': "2019-03-01T23:59:57Z"},
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{'datetime':'00:00:01', 'frame': 53, 'freq': '402.000 MHz', 'local_dt': "2019-03-02T00:00:03Z"},
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{'datetime':'11:59:58', 'frame': 42, 'freq': '402.000 MHz', 'local_dt': "2019-03-01T12:00:03Z"},
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{'datetime':'12:00:02', 'frame': 46, 'freq': '402.000 MHz', 'local_dt': "2019-03-01T12:00:03Z"},
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]
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for _test in test_data:
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_test['datetime_dt'] = imet_fix_datetime(_test['datetime'], local_dt_str = _test['local_dt'])
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print("Input Time: %s, Local Time: %s, Output Time: %s" % (_test['datetime'], _test['local_dt'], _test['datetime_dt'].strftime("%Y-%m-%dT%H:%M:%SZ")))
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_test['id'] = imet_unique_id(_test)
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print("Generated ID: %s" % _test['id'])
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print(" ")
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