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Torsten Kurbad
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0273973538
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pyupsmon.py
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210
pyupsmon.py
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#!/usr/bin/python3
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#
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# Depends on pyyaml!
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import shlex
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import subprocess
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import sys
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import yaml
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from serial import Serial
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from threading import Timer
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from time import sleep
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class ConvertUPS(Serial):
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""" Class that implements monitoring for Wöhrle Convert-[123]000 UPS
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devices connected via RS232.
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Has to be initialized like serial.Serial().
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"""
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# Class variables
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_isOnBattery = False # Is UPS running on battery right now?
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_powerToggled = False # Did power state (battery / AC) toggle recently?
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def __init__(self, configfile = '/etc/pyupsmon.yml', port = None,
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baudrate = None, interval = None, shutdownTimeout = None,
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shutdownCommand = None, debug = None, *args, **kwargs):
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""" Read config file and/or set default config values. """
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self.serialPort = port
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self.serialBaud = baudrate
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self.interval = interval
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self.shutdownTimeout = shutdownTimeout
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self.shutdownCommand = shutdownCommand
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self.debug = debug
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try:
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with open(configfile, 'r') as ymlfile:
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cfg = yaml.load(ymlfile)
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if cfg.get('serial') is not None:
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if self.serialPort is None:
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self.serialPort = cfg['serial'].get('port', '/dev/ttyS0')
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if self.serialBaud is None:
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self.serialBaud = int(cfg['serial'].get('baudrate', 2400))
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if cfg.get('daemon') is not None:
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if self.interval is None:
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self.interval = float(cfg['daemon'].get('interval', 1.0))
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if self.debug is None:
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self.debug = bool(cfg['daemon'].get('debug', False))
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if cfg.get('shutdown') is not None:
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if self.shutdownTimeout is None:
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self.shutdownTimeout = float(cfg['shutdown'].get('timeout', 3600))
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if self.shutdownCommand is None:
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self.shutdownCommand = shlex.split(cfg['shutdown'].get('command', '/sbin/shutdown -h now'))
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except OSError:
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if debug:
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print('Could not read config file %s.' % configfile)
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if self.serialPort is None:
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self.serialPort = '/dev/ttyS0'
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if self.serialBaud is None:
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self.serialBaud = 2400
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if self.interval is None:
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self.interval = 1.0
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if self.debug is None:
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self.debug = False
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if self.shutdownTimeout is None:
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self.shutdownTimeout = 3600.0
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if self.shutdownCommand is None:
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self.shutdownCommand = shlex.split('/sbin/shutdown -h now')
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if self.debug:
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print('Configuration:')
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print('\tSerial Port:\t\t%s' % self.serialPort)
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print('\tBaud Rate:\t\t%d' % self.serialBaud)
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print('\tQuery Interval:\t\t%.2f s' % self.interval)
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print('\tDebugging:\t\t%s' % self.debug)
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print('\tShutdown Timeout:\t%.2f' % self.shutdownTimeout)
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print('\tShutdown Command:\t%s' % self.shutdownCommand)
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super(ConvertUPS, self).__init__(port = self.serialPort,
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baudrate = self.serialBaud, *args, **kwargs)
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def upsInit(self):
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""" Start communicating with the UPS. """
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if not self.name:
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if self.debug:
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raise NameError('Please, set the serial communication parameters first.')
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if self.debug:
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print('Successfully connected to serial port %s' % (ups.name))
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print('Sending initialization sequence (you should hear a short beep).')
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self.write(b'CT\rDQ1\r')
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sleep(5.0)
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self.write(b'Rt\r')
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sleep(3.0)
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self.write(b'Q1\r')
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sleep(1.0)
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readbuffer = b''
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data = self.read(1)
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while b'\r' not in data:
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readbuffer += data
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data = self.read(1)
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if readbuffer.strip().startswith(b'('):
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if self.debug:
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print('Initialization successful.')
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print('Initial values returned:', readbuffer.strip())
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return True
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return
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def upsRead(self):
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""" Read the current status of the UPS. """
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ups.write(b'Q1\r')
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readbuffer = b''
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data = ups.read(1)
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while b'\r' not in data:
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readbuffer += data
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data = ups.read(1)
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if self.debug:
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print(readbuffer.strip())
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return readbuffer.strip()
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def isOnBattery(self):
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""" Check whether UPS is on Battery. """
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status = self.upsRead()
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if status.startswith(b'(000.0 '):
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if not self._isOnBattery:
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self._isOnBattery = True
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self._powerToggled = True
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if self.debug:
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print('UPS is on battery.')
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else:
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if self._isOnBattery:
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self._isOnBattery = False
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self._powerToggled = True
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if self.debug:
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print('UPS is on AC.')
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return self._isOnBattery
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def powerToggled(self):
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""" Check if a power toggle (AC -> Battery or vice versa)
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occured and reset the flag.
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"""
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onBattery = self.isOnBattery()
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if self._powerToggled:
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self._powerToggled = False
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if self.debug:
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print('Power toggle has occured recently.')
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if onBattery:
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return(True, True)
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else:
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return(True, False)
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if self.debug:
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print('No power toggle has occured recently.')
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if onBattery:
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return (False, True)
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return (False, False)
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def doShutdown(self):
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""" Execute self.shutdownCommand. """
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subprocess.call(self.shutdownCommand)
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def startShutdownTimer(self):
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""" Start a timer that executes self.shutdownCommand as soon as
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self.shutdownTimeout has expired.
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If self.shutdownTimeout == 0, the timer is disabled.
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"""
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if self.shutdownTimeout > 0:
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self.timer = Timer(self.shutdownTimeout, self.doShutdown)
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self.timer.start()
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def cancelShutdownTimer(self):
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""" Cancel a previously started shutdown timer. """
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if self.timer is not None:
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self.timer.cancel()
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self.timer = None
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if __name__ == "__main__":
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#try:
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ups = ConvertUPS()
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#except:
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# print('Error: Could not open UPS serial connection.')
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# print('\tCheck the config file!')
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# sys.exit(1)
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if not ups.upsInit():
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print('Error: Could not initialize UPS.')
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sys.exit(1)
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while True:
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(toggled, onBatt) = ups.powerToggled()
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if toggled:
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if onBatt:
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ups.startShutdownTimer()
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if not onBatt:
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ups.cancelShutdownTimer()
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sleep(ups.interval)
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36
pyupsmon.yml.example
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36
pyupsmon.yml.example
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@ -0,0 +1,36 @@
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# Serial port parameters
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serial:
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# Serial port the UPS is connected to
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#
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# Default: /dev/ttyS0
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#port: /dev/ttyS0
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# Baud rate to set for the serial port
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#
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# Default: 2400
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#baudrate: 2400
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# Daemon settings
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daemon:
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# UPS query interval (in seconds)
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#
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# Default: 1.0
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#interval: 2
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# Enable debug output?
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#
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# Default: 0
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#debug: 1
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# Shutdown settings
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shutdown:
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# Shutdown the monitoring host after this many seconds
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# on battery (0 to disable)
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#
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# Default: 3600.0
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#timeout: 180.0
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# Shutdown command to execute after timeout expired
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#
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# Default: /sbin/shutdown -h now
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#command: /sbin/shutdown -h now
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