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import pyudev
import threading
class DevicePoller:
def __init__(self, dev):
self.device_added = threading.Event()
self.device_removed = threading.Event()
self.device = dev
self.wait_add = self.device_added.wait
self.wait_remove = self.device_removed.wait
self.have = self.device_added.is_set
if dev:
self.device_added.set()
def launch_observer(self, monitor, device_match):
if not monitor:
monitor = pyudev.Monitor.from_netlink(pyudev.Context())
def handle_event(action, device):
if action == 'add' and device_match(device):
self.device = device
self.device_removed.clear()
self.device_added.set()
elif action == 'remove' and device == self.device:
self.device = None
self.device_added.clear()
self.device_removed.set()
self.observer = pyudev.MonitorObserver(monitor, handle_event)
self.observer.start()
def stop_observer():
self.observer.stop()
def simple_devicer(subsystem, predicate):
dev = None
context = pyudev.Context()
for try_dev in context.list_devices(subsystem=subsystem):
if predicate(try_dev):
dev = try_dev
break
monitor = pyudev.Monitor.from_netlink(context)
monitor.filter_by(subsystem)
devicer = DevicePoller(dev)
devicer.launch_observer(monitor, predicate)
return devicer
if __name__ == '__main__':
dexcom_g5_product = '22a3/47/100'
def is_dexcom_g5(dev):
try: return dev.parent.get('PRODUCT') == dexcom_g5_product
except: return False
devicer = simple_devicer('tty', is_dexcom_g5)
while True:
print("waiting for device")
devicer.wait_add()
while devicer.have():
print("poll device {0}".format(devicer.device))
print("sleep(5)")
if devicer.wait_remove(5):
print("device removed")
devicer.stop_observer()
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