72 lines
1.9 KiB
Python
72 lines
1.9 KiB
Python
'''
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Various helper functions and classes
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'''
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import time, os
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from subprocess import check_output, DEVNULL, CalledProcessError
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from threading import Event
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from exceptionThreading import ExceptionThread
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class CountdownTimer(ExceptionThread):
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'''
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Launches thread which self terminates after some time (given in seconds).
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Termination triggers some action (a function). Optionally, a sound can be
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assigned to each 'tick'
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'''
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def __init__(self, countdownSeconds, action, sound=None):
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self._stopper = Event()
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def countdown():
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for i in range(countdownSeconds, 0, -1):
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if self._stopper.isSet():
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return None
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if sound and i < countdownSeconds:
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sound.play()
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time.sleep(1)
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action()
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super().__init__(target=countdown, daemon=True)
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self.start()
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def stop(self):
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self._stopper.set()
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def __del__(self):
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self.stop()
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def mkdirSafe(path, logger):
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'''
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Makes new dir if path does not exist, and aborts program if path exists and
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path is a file not a dir. Else does nothing
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'''
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if not os.path.exists(path):
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os.mkdir(path)
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elif os.path.isfile(path):
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logger.error('%s is present but is a file (vs a directory). ' \
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'Please (re)move this file to prevent data loss', path)
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raise SystemExit
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def waitForPath(path, logger=None, timeout=30):
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'''
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Waits for a path to appear. Useful for procfs and sysfs where devices
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regularly (dis)appear. Timeout given in seconds
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'''
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for i in range(0, timeout):
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if os.path.exists(path):
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return
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time.sleep(1)
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if logger:
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logger.error('Could not find %s after %s seconds', path, timeout)
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raise SystemExit
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def resetUSBDevice(device):
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'''
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Resets a USB device using the de/reauthorization method. This is really
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crude but works beautifully
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'''
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devpath = os.path.join('/sys/bus/usb/devices/' + device + '/authorized')
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with open(devpath, 'w') as f:
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f.write('0')
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with open(devpath, 'w') as f:
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f.write('1')
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