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#!/usr/bin/env python3
# © Copyright 2021-2022, Scott Gasch
"""Code involving querying various smart home thermometers."""
import logging
import urllib.request
from typing import Optional
logger = logging.getLogger()
class ThermometerRegistry(object):
"""A registry of thermometer hosts / names and how to talk with them."""
def __init__(self):
self.thermometers = {
'house_outside': ('10.0.0.75', 'outside_temp'),
'house_inside_downstairs': ('10.0.0.75', 'inside_downstairs_temp'),
'house_inside_upstairs': ('10.0.0.75', 'inside_upstairs_temp'),
'house_computer_closet': ('10.0.0.75', 'computer_closet_temp'),
'house_crawlspace': ('10.0.0.75', 'crawlspace_temp'),
'cabin_outside': ('192.168.0.107', 'outside_temp'),
'cabin_inside': ('192.168.0.107', 'inside_temp'),
'cabin_crawlspace': ('192.168.0.107', 'crawlspace_temp'),
'cabin_hottub': ('192.168.0.107', 'hottub_temp'),
}
def read_temperature(self, location: str, *, convert_to_fahrenheit=False) -> Optional[float]:
"""Read the current value of a thermometer (in celsius unless
convert_to_fahrenheit is True) and return it. Return None on
error.
>>> registry = ThermometerRegistry()
>>> registry.read_temperature('unknown') is None
True
>>> temp = registry.read_temperature('house_computer_closet')
>>> temp is None
False
>>> temp > 0.0
True
"""
record = self.thermometers.get(location, None)
if record is None:
logger.error(
'Location %s is not known. Valid locations are %s.',
location,
self.thermometers.keys(),
)
return None
url = f'http://{record[0]}/~pi/{record[1]}'
logger.debug('Constructed URL: %s', url)
try:
www = urllib.request.urlopen(url, timeout=3)
temp = www.read().decode('utf-8')
temp = float(temp)
if convert_to_fahrenheit:
temp *= 9 / 5
temp += 32.0
temp = round(temp)
except Exception as e:
logger.exception(e)
logger.error('Failed to read temperature at URL: %s', url)
temp = None
finally:
if www is not None:
www.close()
return temp
if __name__ == '__main__':
import doctest
doctest.testmod()
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