kopia lustrzana https://github.com/glidernet/python-ogn-client
62 wiersze
2.5 KiB
Python
62 wiersze
2.5 KiB
Python
from datetime import datetime, timedelta
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from ogn.parser.exceptions import AmbigousTimeError
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kmh2kts = 0.539957
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feet2m = 0.3048
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ms2fpm = 196.85
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kts2kmh = 1 / kmh2kts
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m2feet = 1 / feet2m
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fpm2ms = 1 / ms2fpm
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def parseAngle(dddmmhht):
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return float(dddmmhht[:3]) + float(dddmmhht[3:]) / 60
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def createTimestamp(timestamp, reference_date, reference_time=None):
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if timestamp[-1] == "z":
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day = int(timestamp[0:2])
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hhmm = timestamp[2:6]
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if reference_date.day < day:
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if reference_date.month == 1:
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reference_date = reference_date.replace(year=reference_date.year - 1, month=12, day=day)
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else:
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reference_date = reference_date.replace(month=reference_date.month - 1, day=day)
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else:
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reference_date = reference_date.replace(day=day)
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packet_time = datetime.strptime(hhmm, '%H%M').time()
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return datetime.combine(reference_date, packet_time)
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elif timestamp[-1] == "h":
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hhmmss = timestamp[:-1]
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packet_time = datetime.strptime(hhmmss, '%H%M%S').time()
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else:
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raise ValueError()
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if reference_time is None:
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return datetime.combine(reference_date, packet_time)
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else:
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reference_datetime = datetime.combine(reference_date, reference_time)
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timestamp = datetime.combine(reference_date, packet_time)
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delta = timestamp - reference_datetime
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# This function reconstructs the packet date from the timestamp and a reference_datetime time.
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# delta vs. packet date:
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# -24h -12h 0 +12h +24h
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# |-------------------------|---------------------|------------------------|----------------------|
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# [-] <-- tomorrow [---------today---------] [-------yesterday------]
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if timedelta(hours=-12) <= delta <= timedelta(minutes=30):
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# Packet less than 12h from the past or 30min from the future
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return timestamp
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elif delta < timedelta(hours=-23, minutes=-30):
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# Packet from next day, less than 30min from the future
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return datetime.combine(reference_datetime + timedelta(hours=+12), packet_time)
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elif timedelta(hours=12) < delta:
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# Packet from previous day, less than 12h from the past
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return datetime.combine(reference_datetime + timedelta(hours=-12), packet_time)
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else:
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raise AmbigousTimeError(reference_datetime, packet_time)
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