smart_home/thermometers.py

   1 #!/usr/bin/env python3
   2
   3 # © Copyright 2021-2022, Scott Gasch
   4
   5 """Code involving querying various smart home thermometers."""
   6
   7 import logging
   8 import urllib.request
   9 from typing import Optional
  10
  11 logger = logging.getLogger()
  12
  13
  14 class ThermometerRegistry(object):
  15     """A registry of thermometer hosts / names and how to talk with them."""
  16
  17     def __init__(self):
  18         self.thermometers = {
  19             'house_outside': ('10.0.0.75', 'outside_temp'),
  20             'house_inside_downstairs': ('10.0.0.75', 'inside_downstairs_temp'),
  21             'house_inside_upstairs': ('10.0.0.75', 'inside_upstairs_temp'),
  22             'house_computer_closet': ('10.0.0.75', 'computer_closet_temp'),
  23             'house_crawlspace': ('10.0.0.75', 'crawlspace_temp'),
  24             'cabin_outside': ('192.168.0.107', 'outside_temp'),
  25             'cabin_inside': ('192.168.0.107', 'inside_temp'),
  26             'cabin_crawlspace': ('192.168.0.107', 'crawlspace_temp'),
  27             'cabin_hottub': ('192.168.0.107', 'hottub_temp'),
  28         }
  29
  30     def read_temperature(self, location: str, *, convert_to_fahrenheit=False) -> Optional[float]:
  31         record = self.thermometers.get(location, None)
  32         if record is None:
  33             logger.error(
  34                 'Location %s is not known.  Valid locations are %s.',
  35                 location,
  36                 self.thermometers.keys(),
  37             )
  38             return None
  39         url = f'http://{record[0]}/~pi/{record[1]}'
  40         logger.debug('Constructed URL: %s', url)
  41         try:
  42             www = urllib.request.urlopen(url, timeout=3)
  43             temp = www.read().decode('utf-8')
  44             temp = float(temp)
  45             if convert_to_fahrenheit:
  46                 temp *= 9 / 5
  47                 temp += 32.0
  48                 temp = round(temp)
  49         except Exception as e:
  50             logger.exception(e)
  51             logger.error('Failed to read temperature at URL: %s', url)
  52             temp = None
  53         finally:
  54             if www is not None:
  55                 www.close()
  56         return temp