Current File : //lib/python2.7/site-packages/salt/beacons/sensehat.py
# -*- coding: utf-8 -*-
'''
Monitor temperature, humidity and pressure using the SenseHat of a Raspberry Pi
===============================================================================
.. versionadded:: 2017.7.0
:maintainer: Benedikt Werner <1benediktwerner@gmail.com>
:maturity: new
:depends: sense_hat Python module
'''
from __future__ import absolute_import, unicode_literals
import logging
import re
from salt.ext import six
from salt.ext.six.moves import map
log = logging.getLogger(__name__)
def __virtual__():
return 'sensehat.get_pressure' in __salt__
def validate(config):
'''
Validate the beacon configuration
'''
# Configuration for sensehat beacon should be a list
if not isinstance(config, list):
return False, ('Configuration for sensehat beacon '
'must be a list.')
else:
_config = {}
list(map(_config.update, config))
if 'sensors' not in _config:
return False, ('Configuration for sensehat'
' beacon requires sensors.')
return True, 'Valid beacon configuration'
def beacon(config):
'''
Monitor the temperature, humidity and pressure using the SenseHat sensors.
You can either specify a threshold for each value and only emit a beacon
if it is exceeded or define a range and emit a beacon when the value is
out of range.
Units:
* humidity: percent
* temperature: degrees Celsius
* temperature_from_pressure: degrees Celsius
* pressure: Millibars
.. code-block:: yaml
beacons:
sensehat:
- sensors:
humidity: 70%
temperature: [20, 40]
temperature_from_pressure: 40
pressure: 1500
'''
ret = []
min_default = {
'humidity': '0',
'pressure': '0',
'temperature': '-273.15'
}
_config = {}
list(map(_config.update, config))
for sensor in _config.get('sensors', {}):
sensor_function = 'sensehat.get_{0}'.format(sensor)
if sensor_function not in __salt__:
log.error('No sensor for meassuring %s. Skipping.', sensor)
continue
sensor_config = _config['sensors'][sensor]
if isinstance(sensor_config, list):
sensor_min = six.text_type(sensor_config[0])
sensor_max = six.text_type(sensor_config[1])
else:
sensor_min = min_default.get(sensor, '0')
sensor_max = six.text_type(sensor_config)
if '%' in sensor_min:
sensor_min = re.sub('%', '', sensor_min)
if '%' in sensor_max:
sensor_max = re.sub('%', '', sensor_max)
sensor_min = float(sensor_min)
sensor_max = float(sensor_max)
current_value = __salt__[sensor_function]()
if not sensor_min <= current_value <= sensor_max:
ret.append({
'tag': 'sensehat/{0}'.format(sensor),
sensor: current_value
})
return ret
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