#!/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
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'),
}
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(
- f'Location {location} is not known. Valid locations are {self.thermometers.keys()}.'
+ '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(f'Constructed URL: {url}')
+ logger.debug('Constructed URL: %s', url)
try:
www = urllib.request.urlopen(url, timeout=3)
temp = www.read().decode('utf-8')
temp = round(temp)
except Exception as e:
logger.exception(e)
- logger.error(f'Failed to read temperature at URL: {url}')
+ 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()