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annotate weather_server/types.py @ 9:f1ea183d28ba

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author Paul Fisher <paul@pfish.zone>
date Sun, 29 Sep 2019 20:34:38 -0400
parents efe7a1eff167
children 52ef21607b31
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1 """Basic data types for the weather server."""
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2
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3 import datetime
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4 import math
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5 import typing as t
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6
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7 import attr
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8 import pytz
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9
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10
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11 def c_to_f(c: float) -> float:
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12 return c * 9 / 5 + 32
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13
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14
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15 # Values from Sontag1990 via Wikipedia:
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16 # https://en.wikipedia.org/wiki/Dew_point
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17 _MAGNUS_B = 17.62
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18 _MAGNUS_C = 243.12
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19
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20
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21 @attr.s(frozen=True, slots=True)
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22 class Reading:
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23 """A single reading from a weather thingy.
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24
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25 Field order is important, as it is used in CSV files.
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26 """
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27
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28 # The Unix timestamp of the reading.
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29 sample_time = attr.ib(type=datetime.datetime)
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30
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31 # The temperature, in degrees Celsius.
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32 temp_c = attr.ib(type=float)
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33
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34 # The relative humidity, in percent.
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35 rh_pct = attr.ib(type=float)
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36
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37 # The Unix timestamp when the reading was received.
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38 ingest_time = attr.ib(type=datetime.datetime)
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39
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40 @property
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41 def temp_f(self) -> float:
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42 return c_to_f(self.temp_c)
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43
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44 @property
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45 def dew_point_c(self) -> float:
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46 gamma = self._gamma
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47 return _MAGNUS_C * gamma / (_MAGNUS_B - gamma)
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48
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49 @property
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50 def dew_point_f(self) -> float:
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51 return c_to_f(self.dew_point_c)
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52
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53 def as_dict(self) -> t.Dict[str, t.Any]:
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54 return attr.asdict(self, recurse=False)
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55
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56 @classmethod
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57 def from_now(cls, **kwargs) -> 'Reading':
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58 return cls(ingest_time=_utc_now(), **kwargs)
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59
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60 @property
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61 def _gamma(self) -> float:
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62 return (
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63 math.log(self.rh_pct / 100) +
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64 _MAGNUS_B * self.temp_c / (_MAGNUS_C + self.temp_c))
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65
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66
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67 def _utc_now():
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68 return datetime.datetime.utcnow().replace(tzinfo=pytz.UTC)