Mercurial > personal > weather-server

annotate weather_server/locations.py @ 26:7def5611895b

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Add support for an index page displaying all locations. This seems as good a time as any to declare 0.1.0.
author Paul Fisher <paul@pfish.zone>
date Sun, 10 Nov 2019 23:46:51 -0500
parents 20c8ec56e447
children 9bc3687e1e5e
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1 """Manages the directory containing the various logs."""
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2
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3 import configparser
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4 import datetime
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5 import pathlib
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6 import typing as t
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7
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8 import pytz
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9
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10 from . import logfile
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11 from . import types
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12
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13 CONFIG_FILE = 'config.ini'
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14 LOG = 'log.bson'
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16
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17 class ConfigError(Exception):
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18 """Raised when a location can't be loaded."""
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21 class Location:
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23 def __init__(self, root: pathlib.Path, key: str):
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24 parser = configparser.ConfigParser(interpolation=None)
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25 self.root = root
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26 self.key = key
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27 config_file = root / CONFIG_FILE
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28 try:
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29 with open(config_file, 'r') as infile:
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30 parser.read_file(infile)
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31 self.name = parser.get(
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32 'location', 'name', fallback='Weather station')
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33 self.tz_name = parser.get('location', 'timezone', fallback='UTC')
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34 self.password = parser.get('location', 'password')
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35 self.logger = logfile.Logger(
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36 str(root / LOG), sample_field='sample_time')
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37 except (IOError, KeyError, configparser.Error):
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38 raise ConfigError("Couldn't load location info.")
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39
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40 def record(
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41 self,
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42 entries: t.Iterable[t.Dict[str, object]],
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43 timestamp: datetime.datetime,
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44 ) -> None:
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45 for e in entries:
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46 e['ingest_time'] = timestamp
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47 self.logger.write_rows(entries)
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48
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49 @property
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50 def entries(self) -> t.Iterable[t.Dict[str, object]]:
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51 return self.logger.data
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52
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53 def latest(self) -> t.Optional[types.Reading]:
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54 most_recent = reversed(self.logger.data)
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55 for entry in most_recent:
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56 try:
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57 return types.Reading.from_dict(entry)
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58 except KeyError:
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59 pass # go to the older one.
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60 return None
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61
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62 def timezone(self) -> datetime.tzinfo:
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63 try:
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64 return pytz.timezone(self.tz_name)
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65 except pytz.UnknownTimeZoneError:
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66 return pytz.UTC
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67
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68 def __repr__(self) -> str:
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69 return '<Location in %r>'.format(self.root)
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72 class LocationFolder:
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74 def __init__(self, root: pathlib.Path):
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75 self.root = root
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76 # locations, mtime
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77 self.info: t.Tuple[t.Dict[str, Location], t.Optional[int]] = ({}, None)
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78 self._maybe_reload()
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79
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80 def get(self, name: str) -> Location:
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81 self._maybe_reload()
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82 locs, _ = self.info
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83 return locs[name]
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84
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85 def locations(self) -> t.Dict[str, Location]:
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86 return self.info[0]
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87
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88 def _maybe_reload(self) -> None:
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89 new_mtime = self.root.stat().st_mtime_ns
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90 _, old_mtime = self.info
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91 if old_mtime == new_mtime:
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92 return
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93 locations = {}
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94 for child in self.root.iterdir():
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95 try:
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96 locations[child.name] = Location(child, child.name)
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97 except ConfigError:
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98 pass # It's OK. Skip this.
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99 self.info = locations, new_mtime