smart_home/thermometers.py

   1 #!/usr/bin/env python3
   2
   3 import logging
   4 import urllib.request
   5 from typing import Optional
   6
   7 logger = logging.getLogger()
   8
   9
  10 class ThermometerRegistry(object):
  11     def __init__(self):
  12         self.thermometers = {
  13             'house_outside': ('10.0.0.75', 'outside_temp'),
  14             'house_inside_downstairs': ('10.0.0.75', 'inside_downstairs_temp'),
  15             'house_inside_upstairs': ('10.0.0.75', 'inside_upstairs_temp'),
  16             'house_computer_closet': ('10.0.0.75', 'computer_closet_temp'),
  17             'house_crawlspace': ('10.0.0.75', 'crawlspace_temp'),
  18             'cabin_outside': ('192.168.0.107', 'outside_temp'),
  19             'cabin_inside': ('192.168.0.107', 'inside_temp'),
  20             'cabin_crawlspace': ('192.168.0.107', 'crawlspace_temp'),
  21             'cabin_hottub': ('192.168.0.107', 'hottub_temp'),
  22         }
  23
  24     def read_temperature(self, location: str, *, convert_to_fahrenheit=False) -> Optional[float]:
  25         record = self.thermometers.get(location, None)
  26         if record is None:
  27             logger.error(
  28                 f'Location {location} is not known.  Valid locations are {self.thermometers.keys()}.'
  29             )
  30             return None
  31         url = f'http://{record[0]}/~pi/{record[1]}'
  32         logger.debug(f'Constructed URL: {url}')
  33         try:
  34             www = urllib.request.urlopen(url, timeout=3)
  35             temp = www.read().decode('utf-8')
  36             temp = float(temp)
  37             if convert_to_fahrenheit:
  38                 temp *= 9 / 5
  39                 temp += 32.0
  40                 temp = round(temp)
  41         except Exception as e:
  42             logger.exception(e)
  43             logger.error(f'Failed to read temperature at URL: {url}')
  44             temp = None
  45         finally:
  46             if www is not None:
  47                 www.close()
  48         return temp