class UsbPortController:
def __init__(self):
self.usb_bus = UsbBus.Instance()
self.request_buffer = RequestBuffer()
def handle_event(self, action, device):
"""
action: the action that caused this event (eg add, remove)
device: the usb device that prompted the event
"""
operation = Operation(action)
if not device.attributes:
usb_device = self.usb_bus.find_with(path=device.device_path)
new_op = UsbOperation(operation=operation, usb_device=usb_device)
message = DocumentMessage(document=new_op.to_json())
request = Request(
id=message.id, dispatcher=self.usb_monitor_pair.send_string, args=message.serialize(), hop_limit=10
)
self.request_buffer.append(request)
self.usb_bus.remove(usb_device)
else:
usb_device = UsbDevice(device)
self.usb_bus.add(usb_device)
new_op = UsbOperation(operation=operation, usb_device=usb_device)
message = DocumentMessage(document=new_op.to_json())
request = Request(
id=message.id, dispatcher=self.usb_monitor_pair.send_string, args=message.serialize(), hop_limit=10
)
self.request_buffer.append(message)
def run(self):
logger.info("USB Port Controller starting")
context = pyudev.Context()
monitor = pyudev.Monitor.from_netlink(context)
monitor.filter_by(subsystem="usb", device_type="usb_device")
observer = pyudev.MonitorObserver(monitor, self.handle_event)
observer.start()
kbsubscriber = NetworkingManager.KillBroadcastSubscriber()
usb_monitor_pair = NetworkingManager.UsbMonitorPairServer()
poller = NetworkingManager.Poller()
poller.register(kbsubscriber, NetworkingManager.POLLIN)
poller.register(usb_monitor_pair, NetworkingManager.POLLIN)
for device in self.usb_bus.devices:
new_op = UsbOperation(usb_device=device, operation=Operation("add"))
message = DocumentMessage(document=new_op.to_json())
request = Request(
id=message.id, dispatcher=usb_monitor_pair.send_string, args=message.serialize(), hop_limit=10
)
self.request_buffer.append(request)
while True:
self.request_buffer.dispatch_all()
socks = dict(poller.poll(50))
if usb_monitor_pair.contained_in(socks):
reply = CommandMessage.deserialize(usb_monitor_pair.recv_string())
self.request_buffer.process_reply(reply)
if kbsubscriber.contained_in(socks):
message = CommandMessage.deserialize(kbsubscriber.recv_string())
reply_structure = None
try:
command = Command(message.command)
command_processor = CommandProcessor(self)
reply_structure = command_processor.process(command)
except ExitProcess:
observer.stop()
usb_monitor_pair.unbind()
logger.info("USB Port Controller stopping")
break
finally:
# send message if applicable
if reply_structure:
pass
class TransmitterApplicationController:
def __init__(self):
self.router = None
self.poller = None
self.transmitter_applications = dict()
self.request_buffer = RequestBuffer()
def process_usb_operation(self, usb_operation):
transmitter = TransmitterIndex.find_matching(usb_operation.usb_device)
if transmitter:
if usb_operation.operation is Operation.ADD:
self.start_transmitter_application(transmitter)
elif usb_operation.operation is Operation.REMOVE:
self.stop_transmitter_application(transmitter)
def start_transmitter_application(self, transmitter):
for child_id, app in self.transmitter_applications.items():
if app.transmitter == transmitter:
logger.error(
"Process using "+repr(transmitter)+" already running"
)
return
child_id = NEXT_CHILD_ID()
controller = TransmitterController(transmitter, child_id)
process = Process(target=controller.run)
process.daemon = True
process.start()
app = _TransmitterApplication(controller, process)
self.transmitter_applications[child_id] = app
def stop_transmitter_application(self, transmitter):
for child_id, app in self.transmitter_applications.items():
if app.transmitter == transmitter:
message = CommandMessage(command=Command.SHUTDOWN)
request = Request(
id=message.id,
dispatcher=self.router.send_string,
args=[child_id, message.serialize],
hop_limit=-1,
splat_args=True
)
self.request_buffer.append(request)
def stop_all_transmitter_applications(self):
for child_id, app in self.transmitter_applications:
message = CommandMessage(command=Command.SHUTDOWN)
request = Request(
id=message.id,
dispatcher=self.router.send_string,
args=[child_id, message.serialize],
hop_limit=-1,
splat_args=True
)
self.request_buffer.append(request)
app.last_request = message
def run(self):
logger.info("Transmitter Application Controller starting")
# Kill broadcast subscriber
kbsubscriber = NetworkingManager.KillBroadcastSubscriber()
usb_monitor_pair = NetworkingManager.UsbMonitorPairClient()
self.router = NetworkingManager.TACParent()
self.poller = NetworkingManager.Poller()
self.poller.register(kbsubscriber, NetworkingManager.POLLIN)
self.poller.register(usb_monitor_pair, NetworkingManager.POLLIN)
self.poller.register(self.router, NetworkingManager.POLLIN)
while True:
self.request_buffer.dispatch_all()
socks = dict(self.poller.poll(50))
if self.router.contained_in(socks):
child_id, string = self.router.recv_string()
# do some stuff with reply
app = self.transmitter_applications[child_id]
if app.last_request == Command.SHUTDOWN:
reply = CommandMessage.deserialize(string)
self.request_buffer.process_reply(reply)
if app.process.is_alive():
app.process.terminate()
del self.transmitter_applications[child_id]
if usb_monitor_pair.contained_in(socks):
# a message from the usb port controller indicates
# a usb device has been added or removed from the system
request = DocumentMessage.deserialize(
usb_monitor_pair.recv_string()
)
logger.info("Request received: " + request.serialize())
usb_operation = UsbOperation.from_json(request.contents)
self.process_usb_operation(usb_operation)
# send a void reply to confirm receipt
reply = CommandMessage.VoidReply(request)
usb_monitor_pair.send_string(reply.serialize())
if kbsubscriber.contained_in(socks):
message = CommandMessage.deserialize(
kbsubscriber.recv_string()
)
reply_structure = None
try:
command = Command(message.command)
command_processor = CommandProcessor(self)
reply_structure = command_processor.process(command)
except ExitProcess:
self.request_buffer.clear()
self.stop_all_transmitter_applications()
self.request_buffer.dispatch_all()
logger.info("Transmitter Application Controller stopping")
break
finally:
if reply_structure:
pass