# Copyright (c) 2020 Ultimaker B.V.
# Cura is released under the terms of the LGPLv3 or higher.
import time
from collections import deque
from PyQt5.QtCore import QObject, QTimer, pyqtSignal, pyqtProperty
from typing import Optional, Any, Set
from UM.Logger import Logger
from UM.Settings.SettingDefinition import SettingDefinition
from UM.Settings.Validator import ValidatorState
import cura.CuraApplication
class MachineErrorChecker(QObject):
"""This class performs setting error checks for the currently active machine.
The whole error checking process is pretty heavy which can take ~0.5 secs, so it can cause GUI to lag. The idea
here is to split the whole error check into small tasks, each of which only checks a single setting key in a
stack. According to my profiling results, the maximal runtime for such a sub-task is <0.03 secs, which should be
good enough. Moreover, if any changes happened to the machine, we can cancel the check in progress without wait
for it to finish the complete work.
"""
def __init__(self, parent: Optional[QObject] = None) -> None:
super().__init__(parent)
self._global_stack = None
self._has_errors = True # Result of the error check, indicating whether there are errors in the stack
self._error_keys = set() # type: Set[str] # A set of settings keys that have errors
self._error_keys_in_progress = set() # type: Set[str] # The variable that stores the results of the currently in progress check
self._stacks_and_keys_to_check = None # type: Optional[deque] # a FIFO queue of tuples (stack, key) to check for errors
self._need_to_check = False # Whether we need to schedule a new check or not. This flag is set when a new
# error check needs to take place while there is already one running at the moment.
self._check_in_progress = False # Whether there is an error check running in progress at the moment.
self._application = cura.CuraApplication.CuraApplication.getInstance()
self._machine_manager = self._application.getMachineManager()
self._start_time = 0. # measure checking time
# This timer delays the starting of error check so we can react less frequently if the user is frequently
# changing settings.
self._error_check_timer = QTimer(self)
self._error_check_timer.setInterval(100)
self._error_check_timer.setSingleShot(True)
self._keys_to_check = set() # type: Set[str]
def initialize(self) -> None:
self._error_check_timer.timeout.connect(self._rescheduleCheck)
# Reconnect all signals when the active machine gets changed.
self._machine_manager.globalContainerChanged.connect(self._onMachineChanged)
# Whenever the machine settings get changed, we schedule an error check.
self._machine_manager.globalContainerChanged.connect(self.startErrorCheck)
self._onMachineChanged()
def _onMachineChanged(self) -> None:
if self._global_stack:
self._global_stack.propertyChanged.disconnect(self.startErrorCheckPropertyChanged)
self._global_stack.containersChanged.disconnect(self.startErrorCheck)
for extruder in self._global_stack.extruderList:
extruder.propertyChanged.disconnect(self.startErrorCheckPropertyChanged)
extruder.containersChanged.disconnect(self.startErrorCheck)
self._global_stack = self._machine_manager.activeMachine
if self._global_stack:
self._global_stack.propertyChanged.connect(self.startErrorCheckPropertyChanged)
self._global_stack.containersChanged.connect(self.startErrorCheck)
for extruder in self._global_stack.extruderList:
extruder.propertyChanged.connect(self.startErrorCheckPropertyChanged)
extruder.containersChanged.connect(self.startErrorCheck)
hasErrorUpdated = pyqtSignal()
needToWaitForResultChanged = pyqtSignal()
errorCheckFinished = pyqtSignal()
@pyqtProperty(bool, notify = hasErrorUpdated)
def hasError(self) -> bool:
return self._has_errors
@pyqtProperty(bool, notify = needToWaitForResultChanged)
def needToWaitForResult(self) -> bool:
return self._need_to_check or self._check_in_progress
def startErrorCheckPropertyChanged(self, key: str, property_name: str) -> None:
"""Start the error check for property changed
this is separate from the startErrorCheck because it ignores a number property types
:param key:
:param property_name:
"""
if property_name != "value":
return
self._keys_to_check.add(key)
self.startErrorCheck()
def startErrorCheck(self, *args: Any) -> None:
"""Starts the error check timer to schedule a new error check.
:param args:
"""
if not self._check_in_progress:
self._need_to_check = True
self.needToWaitForResultChanged.emit()
self._error_check_timer.start()
def _rescheduleCheck(self) -> None:
"""This function is called by the timer to reschedule a new error check.
If there is no check in progress, it will start a new one. If there is any, it sets the "_need_to_check" flag
to notify the current check to stop and start a new one.
"""
if self._check_in_progress and not self._need_to_check:
self._need_to_check = True
self.needToWaitForResultChanged.emit()
return
self._error_keys_in_progress = set()
self._need_to_check = False
self.needToWaitForResultChanged.emit()
global_stack = self._machine_manager.activeMachine
if global_stack is None:
Logger.log("i", "No active machine, nothing to check.")
return
# Populate the (stack, key) tuples to check
self._stacks_and_keys_to_check = deque()
for stack in global_stack.extruderList:
if not self._keys_to_check:
self._keys_to_check = stack.getAllKeys()
for key in self._keys_to_check:
self._stacks_and_keys_to_check.append((stack, key))
self._application.callLater(self._checkStack)
self._start_time = time.time()
Logger.log("d", "New error check scheduled.")
def _checkStack(self) -> None:
if self._need_to_check:
Logger.log("d", "Need to check for errors again. Discard the current progress and reschedule a check.")
self._check_in_progress = False
self._application.callLater(self.startErrorCheck)
return
self._check_in_progress = True
# If there is nothing to check any more, it means there is no error.
if not self._stacks_and_keys_to_check:
# Finish
self._setResult(False)
return
# Get the next stack and key to check
stack, key = self._stacks_and_keys_to_check.popleft()
enabled = stack.getProperty(key, "enabled")
if not enabled:
self._application.callLater(self._checkStack)
return
validation_state = stack.getProperty(key, "validationState")
if validation_state is None:
# Setting is not validated. This can happen if there is only a setting definition.
# We do need to validate it, because a setting definitions value can be set by a function, which could
# be an invalid setting.
definition = stack.getSettingDefinition(key)
validator_type = SettingDefinition.getValidatorForType(definition.type)
if validator_type:
validator = validator_type(key)
validation_state = validator(stack)
if validation_state in (ValidatorState.Exception, ValidatorState.MaximumError, ValidatorState.MinimumError, ValidatorState.Invalid):
# Since we don't know if any of the settings we didn't check is has an error value, store the list for the
# next check.
keys_to_recheck = {setting_key for stack, setting_key in self._stacks_and_keys_to_check}
keys_to_recheck.add(key)
self._setResult(True, keys_to_recheck = keys_to_recheck)
return
# Schedule the check for the next key
self._application.callLater(self._checkStack)
def _setResult(self, result: bool, keys_to_recheck = None) -> None:
if result != self._has_errors:
self._has_errors = result
self.hasErrorUpdated.emit()
self._machine_manager.stacksValidationChanged.emit()
if keys_to_recheck is None:
self._keys_to_check = set()
else:
self._keys_to_check = keys_to_recheck
self._need_to_check = False
self._check_in_progress = False
self.needToWaitForResultChanged.emit()
self.errorCheckFinished.emit()
Logger.log("i", "Error check finished, result = %s, time = %0.1fs", result, time.time() - self._start_time)