Function printerManager

src/astroprint/printer/manager.py:14–51

(driver = None)

# DO NOT store a reference to the result of printerManager in any persistant object.

def printerManager(driver = None):
	global _instance

	if driver is not None and _instance is not None and _instance.driverName != driver:
		_instance.rampdown()
		_instance = None

	if _instance is None and driver:
		if driver.startswith('plugin:'):
			from astroprint.printer.plugin import PrinterWithPlugin, NoPluginException

			try:
				_instance = PrinterWithPlugin(driver[7:])

			except NoPluginException:
				#The plugin is gone. Pick the default
				from astroprint.printerprofile import printerProfileManager
				ppm = printerProfileManager()
				ppm.set({'driver': DEFAULT_MANAGER})
				ppm.save()

		else:
			import importlib

			try:
				# driver name to class map. format is (module, classname)
				classInfo = {
					'marlin': ('.marlin', 'PrinterMarlin'),
					's3g': ('.s3g', 'PrinterS3g')
				}[driver]

			except KeyError:
				classInfo = ('.marlin', 'PrinterMarlin')

			module = importlib.import_module(classInfo[0], 'astroprint.printer')
			_instance = getattr(module, classInfo[1])()

	return _instance