smart_home/thermometers.py

   1 #!/usr/bin/env python3
   2
   3 import logging
   4 from typing import Optional
   5 import urllib.request
   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(
  25             self, location: str, *, convert_to_fahrenheit=False
  26     ) -> Optional[float]:
  27         record = self.thermometers.get(location, None)
  28         if record is None:
  29             logger.error(
  30                 f'Location {location} is not known.  Valid locations are {self.thermometers.keys()}.'
  31             )
  32             return None
  33         url = f'http://{record[0]}/~pi/{record[1]}'
  34         logger.debug(f'Constructed URL: {url}')
  35         try:
  36             www = urllib.request.urlopen(url, timeout=3)
  37             temp = www.read().decode('utf-8')
  38             temp = float(temp)
  39             if convert_to_fahrenheit:
  40                 temp *= (9/5)
  41                 temp += 32.0
  42                 temp = round(temp)
  43         except Exception as e:
  44             logger.exception(e)
  45             logger.error(f'Failed to read temperature at URL: {url}')
  46             temp = None
  47         finally:
  48             if www is not None:
  49                 www.close()
  50         return temp