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from UM.OutputDevice.OutputDevicePlugin import OutputDevicePlugin
from . import NetworkPrinterOutputDevice
from zeroconf import Zeroconf, ServiceBrowser, ServiceStateChange
from UM.Signal import Signal, signalemitter
from UM.Application import Application
## This plugin handles the connection detection & creation of output device objects for the UM3 printer.
# Zero-Conf is used to detect printers, which are saved in a dict.
# If we discover a printer that has the same key as the active machine instance a connection is made.
@signalemitter
class NetworkPrinterOutputDevicePlugin(OutputDevicePlugin):
def __init__(self):
super().__init__()
self._zero_conf = Zeroconf()
self._browser = None
self._printers = {}
# Because the model needs to be created in the same thread as the QMLEngine, we use a signal.
self.addPrinterSignal.connect(self.addPrinter)
Application.getInstance().globalContainerStackChanged.connect(self.reCheckConnections)
addPrinterSignal = Signal()
## Start looking for devices on network.
def start(self):
self._browser = ServiceBrowser(self._zero_conf, u'_ultimaker._tcp.local.', [self._onServiceChanged])
## Stop looking for devices on network.
def stop(self):
self._zero_conf.close()
def getPrinters(self):
return self._printers
def reCheckConnections(self):
active_machine = Application.getInstance().getGlobalContainerStack()
if not active_machine:
return
for key in self._printers:
if key == active_machine.getMetaDataEntry("um_network_key"):
self._printers[key].connect()
self._printers[key].connectionStateChanged.connect(self._onPrinterConnectionStateChanged)
else:
if self._printers[key].isConnected():
self._printers[key].close()
## Because the model needs to be created in the same thread as the QMLEngine, we use a signal.
def addPrinter(self, name, address, properties):
printer = NetworkPrinterOutputDevice.NetworkPrinterOutputDevice(name, address, properties)
self._printers[printer.getKey()] = printer
global_container_stack = Application.getInstance().getGlobalContainerStack()
if global_container_stack and printer.getKey() == global_container_stack.getMetaDataEntry("um_network_key"):
self._printers[printer.getKey()].connect()
printer.connectionStateChanged.connect(self._onPrinterConnectionStateChanged)
## Handler for when the connection state of one of the detected printers changes
def _onPrinterConnectionStateChanged(self, key):
if self._printers[key].isConnected():
self.getOutputDeviceManager().addOutputDevice(self._printers[key])
else:
self.getOutputDeviceManager().removeOutputDevice(key)
## Handler for zeroConf detection
def _onServiceChanged(self, zeroconf, service_type, name, state_change):
if state_change == ServiceStateChange.Added:
info = zeroconf.get_service_info(service_type, name)
if info:
if info.properties.get(b"type", None) == b'printer':
address = '.'.join(map(lambda n: str(n), info.address))
self.addPrinterSignal.emit(str(name), address, info.properties)
elif state_change == ServiceStateChange.Removed:
pass
# TODO; This isn't testable right now. We need to also decide how to handle
#
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