103 lines
2.9 KiB
Python
103 lines
2.9 KiB
Python
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'''
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Module of Linux API for plyer.battery.
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'''
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from math import floor
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from os import environ
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from os.path import exists, join
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from subprocess import Popen, PIPE
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from plyer.facades import Battery
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from plyer.utils import whereis_exe
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class LinuxBattery(Battery):
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'''
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Implementation of Linux battery API via accessing the sysclass power_supply
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path from the kernel.
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'''
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def _get_state(self):
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status = {"isCharging": None, "percentage": None}
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kernel_bat_path = join('/sys', 'class', 'power_supply', 'BAT0')
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uevent = join(kernel_bat_path, 'uevent')
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with open(uevent) as fle:
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lines = [
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line.decode('utf-8').strip()
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for line in fle.readlines()
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]
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output = {
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line.split('=')[0]: line.split('=')[1]
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for line in lines
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}
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is_charging = output['POWER_SUPPLY_STATUS'] == 'Charging'
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total = float(output['POWER_SUPPLY_CHARGE_FULL'])
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now = float(output['POWER_SUPPLY_CHARGE_NOW'])
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capacity = floor(now / total * 100)
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status['percentage'] = capacity
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status['isCharging'] = is_charging
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return status
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class UPowerBattery(Battery):
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'''
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Implementation of UPower battery API.
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'''
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def _get_state(self):
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# if no LANG specified, return empty string
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old_lang = environ.get('LANG', '')
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environ['LANG'] = 'C'
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status = {"isCharging": None, "percentage": None}
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# We are supporting only one battery now
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# this will fail if there is no object with such path,
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# however it's safer than 'upower -d' which provides
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# multiple unrelated 'state' and 'percentage' keywords
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dev = "/org/freedesktop/UPower/devices/battery_BAT0"
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upower_process = Popen(
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["upower", "--show-info", dev],
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stdout=PIPE
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)
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output = upower_process.communicate()[0].decode()
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environ['LANG'] = old_lang
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if not output:
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return status
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state = percentage = None
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for line in output.splitlines():
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if 'state' in line:
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state = line.rpartition(':')[-1].strip()
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if 'percentage' in line:
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percentage = line.rpartition(':')[-1].strip()[:-1]
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# switching decimal comma to dot
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# (different LC_NUMERIC locale)
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percentage = float(
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percentage.replace(',', '.')
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)
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if state:
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status['isCharging'] = state == "charging"
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status['percentage'] = percentage
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return status
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def instance():
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'''
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Instance for facade proxy.
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'''
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import sys
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if whereis_exe('upower'):
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return UPowerBattery()
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sys.stderr.write("upower not found.")
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if exists(join('/sys', 'class', 'power_supply', 'BAT0')):
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return LinuxBattery()
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return Battery()
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