Cura/plugins/3MFReader/ThreeMFWorkspaceReader.py

from UM.Workspace.WorkspaceReader import WorkspaceReader
from UM.Application import Application

from UM.Logger import Logger
from UM.i18n import i18nCatalog
from UM.Settings.ContainerStack import ContainerStack
from UM.Settings.DefinitionContainer import DefinitionContainer
from UM.Settings.InstanceContainer import InstanceContainer
from UM.Settings.ContainerRegistry import ContainerRegistry
from UM.MimeTypeDatabase import MimeTypeDatabase
from UM.Job import Job
from UM.Preferences import Preferences
from .WorkspaceDialog import WorkspaceDialog

import xml.etree.ElementTree as ET

from cura.Settings.ExtruderManager import ExtruderManager
from cura.Settings.ExtruderStack import ExtruderStack
from cura.Settings.GlobalStack import GlobalStack

from configparser import ConfigParser
import zipfile
import io
import configparser

i18n_catalog = i18nCatalog("cura")


##    Base implementation for reading 3MF workspace files.
class ThreeMFWorkspaceReader(WorkspaceReader):
    def __init__(self):
        super().__init__()
        self._supported_extensions = [".3mf"]
        self._dialog = WorkspaceDialog()
        self._3mf_mesh_reader = None
        self._container_registry = ContainerRegistry.getInstance()

        # suffixes registered with the MineTypes don't start with a dot '.'
        self._definition_container_suffix = "." + ContainerRegistry.getMimeTypeForContainer(DefinitionContainer).preferredSuffix
        self._material_container_suffix = None # We have to wait until all other plugins are loaded before we can set it
        self._instance_container_suffix = "." + ContainerRegistry.getMimeTypeForContainer(InstanceContainer).preferredSuffix
        self._container_stack_suffix = "." + ContainerRegistry.getMimeTypeForContainer(ContainerStack).preferredSuffix
        self._extruder_stack_suffix = "." + ContainerRegistry.getMimeTypeForContainer(ExtruderStack).preferredSuffix
        self._global_stack_suffix = "." + ContainerRegistry.getMimeTypeForContainer(GlobalStack).preferredSuffix

        self._resolve_strategies = {}

        self._id_mapping = {}

    ##  Get a unique name based on the old_id. This is different from directly calling the registry in that it caches results.
    #   This has nothing to do with speed, but with getting consistent new naming for instances & objects.
    def getNewId(self, old_id):
        if old_id not in self._id_mapping:
            self._id_mapping[old_id] = self._container_registry.uniqueName(old_id)
        return self._id_mapping[old_id]

    ##  Separates the given file list into a list of GlobalStack files and a list of ExtruderStack files.
    #
    #   In old versions, extruder stack files have the same suffix as container stack files ".stack.cfg".
    #
    def _determineGlobalAndExtruderStackFiles(self, project_file_name, file_list):
        archive = zipfile.ZipFile(project_file_name, "r")

        global_stack_file_list = [name for name in file_list if name.endswith(self._global_stack_suffix)]
        extruder_stack_file_list = [name for name in file_list if name.endswith(self._extruder_stack_suffix)]

        # separate container stack files and extruder stack files
        files_to_determine = [name for name in file_list if name.endswith(self._container_stack_suffix)]
        for file_name in files_to_determine:
            # FIXME: HACK!
            # We need to know the type of the stack file, but we can only know it if we deserialize it.
            # The default ContainerStack.deserialize() will connect signals, which is not desired in this case.
            # Since we know that the stack files are INI files, so we directly use the ConfigParser to parse them.
            serialized = archive.open(file_name).read().decode("utf-8")
            stack_config = ConfigParser()
            stack_config.read_string(serialized)

            # sanity check
            if not stack_config.has_option("metadata", "type"):
                Logger.log("e", "%s in %s doesn't seem to be valid stack file", file_name, project_file_name)
                continue

            stack_type = stack_config.get("metadata", "type")
            if stack_type == "extruder_train":
                extruder_stack_file_list.append(file_name)
            elif stack_type == "machine":
                global_stack_file_list.append(file_name)
            else:
                Logger.log("w", "Unknown container stack type '%s' from %s in %s",
                           stack_type, file_name, project_file_name)

        if len(global_stack_file_list) != 1:
            raise RuntimeError("More than one global stack file found: [%s]" % str(global_stack_file_list))

        return global_stack_file_list[0], extruder_stack_file_list

    ##  read some info so we can make decisions
    #   \param file_name
    #   \param show_dialog  In case we use preRead() to check if a file is a valid project file, we don't want to show a dialog.
    def preRead(self, file_name, show_dialog=True, *args, **kwargs):
        self._3mf_mesh_reader = Application.getInstance().getMeshFileHandler().getReaderForFile(file_name)
        if self._3mf_mesh_reader and self._3mf_mesh_reader.preRead(file_name) == WorkspaceReader.PreReadResult.accepted:
            pass
        else:
            Logger.log("w", "Could not find reader that was able to read the scene data for 3MF workspace")
            return WorkspaceReader.PreReadResult.failed

        machine_name = ""
        machine_type = ""
        variant_type_name = i18n_catalog.i18nc("@label", "Nozzle")

        num_extruders = 0
        # Check if there are any conflicts, so we can ask the user.
        archive = zipfile.ZipFile(file_name, "r")
        cura_file_names = [name for name in archive.namelist() if name.startswith("Cura/")]

        # A few lists of containers in this project files.
        # When loading the global stack file, it may be associated with those containers, which may or may not be
        # in Cura already, so we need to provide them as alternative search lists.
        definition_container_list = []
        instance_container_list = []
        material_container_list = []

        definition_container_files = [name for name in cura_file_names if name.endswith(self._definition_container_suffix)]
        for definition_container_file in definition_container_files:
            container_id = self._stripFileToId(definition_container_file)
            definitions = self._container_registry.findDefinitionContainers(id=container_id)

            if not definitions:
                definition_container = DefinitionContainer(container_id)
                definition_container.deserialize(archive.open(definition_container_file).read().decode("utf-8"))

            else:
                definition_container = definitions[0]

            definition_container_list.append(definition_container)

            if definition_container.getMetaDataEntry("type") != "extruder":
                machine_type = definition_container.getName()
                variant_type_name = definition_container.getMetaDataEntry("variants_name", variant_type_name)
            else:
                num_extruders += 1
            Job.yieldThread()

        if num_extruders == 0:
            num_extruders = 1 # No extruder stacks found, which means there is one extruder

        extruders = num_extruders * [""]

        material_labels = []
        material_conflict = False
        xml_material_profile = self._getXmlProfileClass()
        if self._material_container_suffix is None:
            self._material_container_suffix = ContainerRegistry.getMimeTypeForContainer(xml_material_profile).preferredSuffix
        if xml_material_profile:
            material_container_files = [name for name in cura_file_names if name.endswith(self._material_container_suffix)]
            for material_container_file in material_container_files:
                container_id = self._stripFileToId(material_container_file)
                materials = self._container_registry.findInstanceContainers(id=container_id)
                material_labels.append(self._getMaterialLabelFromSerialized(archive.open(material_container_file).read().decode("utf-8")))
                if materials and not materials[0].isReadOnly():  # Only non readonly materials can be in conflict
                    material_conflict = True
                Job.yieldThread()
        # Check if any quality_changes instance container is in conflict.
        instance_container_files = [name for name in cura_file_names if name.endswith(self._instance_container_suffix)]
        quality_name = ""
        quality_type = ""
        num_settings_overriden_by_quality_changes = 0 # How many settings are changed by the quality changes
        num_user_settings = 0
        for instance_container_file in instance_container_files:
            container_id = self._stripFileToId(instance_container_file)
            instance_container = InstanceContainer(container_id)

            # Deserialize InstanceContainer by converting read data from bytes to string
            instance_container.deserialize(archive.open(instance_container_file).read().decode("utf-8"))

            instance_container_list.append(instance_container)

            container_type = instance_container.getMetaDataEntry("type")
            if container_type == "quality_changes":
                quality_name = instance_container.getName()
                num_settings_overriden_by_quality_changes += len(instance_container._instances)
                # Check if quality changes already exists.
                quality_changes = self._container_registry.findInstanceContainers(id = container_id)
                if quality_changes:
                    # Check if there really is a conflict by comparing the values
                    if quality_changes[0] != instance_container:
                        quality_changes_conflict = True
            elif container_type == "quality":
                # If the quality name is not set (either by quality or changes, set it now)
                # Quality changes should always override this (as they are "on top")
                if quality_name == "":
                    quality_name = instance_container.getName()
                quality_type = instance_container.getName()
            elif container_type == "user":
                num_user_settings += len(instance_container._instances)

            Job.yieldThread()

        # Load ContainerStack files and ExtruderStack files
        global_stack_file, extruder_stack_files = self._determineGlobalAndExtruderStackFiles(
            file_name, cura_file_names)
        self._resolve_strategies = {"machine": None, "quality_changes": None, "material": None}
        machine_conflict = False
        quality_changes_conflict = False
        for container_stack_file in [global_stack_file] + extruder_stack_files:
            container_id = self._stripFileToId(container_stack_file)
            serialized = archive.open(container_stack_file).read().decode("utf-8")
            if machine_name == "":
                machine_name = self._getMachineNameFromSerializedStack(serialized)
            stacks = self._container_registry.findContainerStacks(id = container_id)
            if stacks:
                # Check if there are any changes at all in any of the container stacks.
                id_list = self._getContainerIdListFromSerialized(serialized)
                for index, container_id in enumerate(id_list):
                    if stacks[0].getContainer(index).getId() != container_id:
                        machine_conflict = True
            Job.yieldThread()

        num_visible_settings = 0
        try:
            temp_preferences = Preferences()
            temp_preferences.readFromFile(io.TextIOWrapper(archive.open("Cura/preferences.cfg")))  # We need to wrap it, else the archive parser breaks.

            visible_settings_string = temp_preferences.getValue("general/visible_settings")
            if visible_settings_string is not None:
                num_visible_settings = len(visible_settings_string.split(";"))
            active_mode = temp_preferences.getValue("cura/active_mode")
            if not active_mode:
                active_mode = Preferences.getInstance().getValue("cura/active_mode")
        except KeyError:
            # If there is no preferences file, it's not a workspace, so notify user of failure.
            Logger.log("w", "File %s is not a valid workspace.", file_name)
            return WorkspaceReader.PreReadResult.failed

        # In case we use preRead() to check if a file is a valid project file, we don't want to show a dialog.
        if not show_dialog:
            return WorkspaceReader.PreReadResult.accepted

        # Show the dialog, informing the user what is about to happen.
        self._dialog.setMachineConflict(machine_conflict)
        self._dialog.setQualityChangesConflict(quality_changes_conflict)
        self._dialog.setMaterialConflict(material_conflict)
        self._dialog.setNumVisibleSettings(num_visible_settings)
        self._dialog.setQualityName(quality_name)
        self._dialog.setQualityType(quality_type)
        self._dialog.setNumSettingsOverridenByQualityChanges(num_settings_overriden_by_quality_changes)
        self._dialog.setNumUserSettings(num_user_settings)
        self._dialog.setActiveMode(active_mode)
        self._dialog.setMachineName(machine_name)
        self._dialog.setMaterialLabels(material_labels)
        self._dialog.setMachineType(machine_type)
        self._dialog.setExtruders(extruders)
        self._dialog.setVariantType(variant_type_name)
        self._dialog.setHasObjectsOnPlate(Application.getInstance().platformActivity)
        self._dialog.show()

        # Block until the dialog is closed.
        self._dialog.waitForClose()

        if self._dialog.getResult() == {}:
            return WorkspaceReader.PreReadResult.cancelled

        self._resolve_strategies = self._dialog.getResult()

        return WorkspaceReader.PreReadResult.accepted

    ##  Read the project file
    #   Add all the definitions / materials / quality changes that do not exist yet. Then it loads
    #   all the stacks into the container registry. In some cases it will reuse the container for the global stack.
    #   It handles old style project files containing .stack.cfg as well as new style project files
    #   containing global.cfg / extruder.cfg
    #
    #   \param file_name
    def read(self, file_name):
        archive = zipfile.ZipFile(file_name, "r")

        cura_file_names = [name for name in archive.namelist() if name.startswith("Cura/")]

        # Create a shadow copy of the preferences (we don't want all of the preferences, but we do want to re-use its
        # parsing code.
        temp_preferences = Preferences()
        temp_preferences.readFromFile(io.TextIOWrapper(archive.open("Cura/preferences.cfg")))  # We need to wrap it, else the archive parser breaks.

        # Copy a number of settings from the temp preferences to the global
        global_preferences = Preferences.getInstance()

        visible_settings = temp_preferences.getValue("general/visible_settings")
        if visible_settings is None:
            Logger.log("w", "Workspace did not contain visible settings. Leaving visibility unchanged")
        else:
            global_preferences.setValue("general/visible_settings", visible_settings)

        categories_expanded = temp_preferences.getValue("cura/categories_expanded")
        if categories_expanded is None:
            Logger.log("w", "Workspace did not contain expanded categories. Leaving them unchanged")
        else:
            global_preferences.setValue("cura/categories_expanded", categories_expanded)

        Application.getInstance().expandedCategoriesChanged.emit()  # Notify the GUI of the change

        self._id_mapping = {}

        # We don't add containers right away, but wait right until right before the stack serialization.
        # We do this so that if something goes wrong, it's easier to clean up.
        containers_to_add = []

        # TODO: For the moment we use pretty naive existence checking. If the ID is the same, we assume in quite a few
        # TODO: cases that the container loaded is the same (most notable in materials & definitions).
        # TODO: It might be possible that we need to add smarter checking in the future.
        Logger.log("d", "Workspace loading is checking definitions...")
        # Get all the definition files & check if they exist. If not, add them.
        definition_container_files = [name for name in cura_file_names if name.endswith(self._definition_container_suffix)]
        for definition_container_file in definition_container_files:
            container_id = self._stripFileToId(definition_container_file)
            definitions = self._container_registry.findDefinitionContainers(id = container_id)
            if not definitions:
                definition_container = DefinitionContainer(container_id)
                definition_container.deserialize(archive.open(definition_container_file).read().decode("utf-8"))
                self._container_registry.addContainer(definition_container)
            Job.yieldThread()

        Logger.log("d", "Workspace loading is checking materials...")
        material_containers = []
        # Get all the material files and check if they exist. If not, add them.
        xml_material_profile = self._getXmlProfileClass()
        if self._material_container_suffix is None:
            self._material_container_suffix = ContainerRegistry.getMimeTypeForContainer(xml_material_profile).suffixes[0]
        if xml_material_profile:
            material_container_files = [name for name in cura_file_names if name.endswith(self._material_container_suffix)]
            for material_container_file in material_container_files:
                container_id = self._stripFileToId(material_container_file)
                materials = self._container_registry.findInstanceContainers(id = container_id)
                if not materials:
                    material_container = xml_material_profile(container_id)
                    material_container.deserialize(archive.open(material_container_file).read().decode("utf-8"))
                    containers_to_add.append(material_container)
                else:
                    if not materials[0].isReadOnly():  # Only create new materials if they are not read only.
                        if self._resolve_strategies["material"] == "override":
                            materials[0].deserialize(archive.open(material_container_file).read().decode("utf-8"))
                        elif self._resolve_strategies["material"] == "new":
                            # Note that we *must* deserialize it with a new ID, as multiple containers will be
                            # auto created & added.
                            material_container = xml_material_profile(self.getNewId(container_id))
                            material_container.deserialize(archive.open(material_container_file).read().decode("utf-8"))
                            containers_to_add.append(material_container)
                            material_containers.append(material_container)
                Job.yieldThread()

        Logger.log("d", "Workspace loading is checking instance containers...")
        # Get quality_changes and user profiles saved in the workspace
        instance_container_files = [name for name in cura_file_names if name.endswith(self._instance_container_suffix)]
        user_instance_containers = []
        quality_and_definition_changes_instance_containers = []
        for instance_container_file in instance_container_files:
            container_id = self._stripFileToId(instance_container_file)
            instance_container = InstanceContainer(container_id)

            # Deserialize InstanceContainer by converting read data from bytes to string
            instance_container.deserialize(archive.open(instance_container_file).read().decode("utf-8"))
            container_type = instance_container.getMetaDataEntry("type")
            Job.yieldThread()
            if container_type == "user":
                # Check if quality changes already exists.
                user_containers = self._container_registry.findInstanceContainers(id = container_id)
                if not user_containers:
                    containers_to_add.append(instance_container)
                else:
                    if self._resolve_strategies["machine"] == "override" or self._resolve_strategies["machine"] is None:
                        user_containers[0].deserialize(archive.open(instance_container_file).read().decode("utf-8"))
                    elif self._resolve_strategies["machine"] == "new":
                        # The machine is going to get a spiffy new name, so ensure that the id's of user settings match.
                        extruder_id = instance_container.getMetaDataEntry("extruder", None)
                        if extruder_id:
                            new_id = self.getNewId(extruder_id) + "_current_settings"
                            instance_container._id = new_id
                            instance_container.setName(new_id)
                            instance_container.setMetaDataEntry("extruder", self.getNewId(extruder_id))
                            containers_to_add.append(instance_container)

                        machine_id = instance_container.getMetaDataEntry("machine", None)
                        if machine_id:
                            new_id = self.getNewId(machine_id) + "_current_settings"
                            instance_container._id = new_id
                            instance_container.setName(new_id)
                            instance_container.setMetaDataEntry("machine", self.getNewId(machine_id))
                            containers_to_add.append(instance_container)
                user_instance_containers.append(instance_container)
            elif container_type in ("quality_changes", "definition_changes"):
                # Check if quality changes already exists.
                changes_containers = self._container_registry.findInstanceContainers(id = container_id)
                if not changes_containers:
                    containers_to_add.append(instance_container)
                else:
                    if self._resolve_strategies[container_type] == "override":
                        changes_containers[0].deserialize(archive.open(instance_container_file).read().decode("utf-8"))
                    elif self._resolve_strategies[container_type] is None:
                        # The ID already exists, but nothing in the values changed, so do nothing.
                        pass
                quality_and_definition_changes_instance_containers.append(instance_container)
            else:
                existing_container = self._container_registry.findInstanceContainers(id = container_id)
                if not existing_container:
                    containers_to_add.append(instance_container)

        # Add all the containers right before we try to add / serialize the stack
        for container in containers_to_add:
            self._container_registry.addContainer(container)
            container.setDirty(True)

        # Get the stack(s) saved in the workspace.
        Logger.log("d", "Workspace loading is checking stacks containers...")
        global_stack_file, extruder_stack_files = self._determineGlobalAndExtruderStackFiles(file_name, cura_file_names)

        global_stack = None
        old_extruder_stacks = Application.getInstance().getGlobalContainerStack().extruders
        extruder_stacks = []
        extruder_stacks_added = []
        container_stacks_added = []

        # load extruder stack files
        try:
            for extruder_stack_file in extruder_stack_files:
                container_id = self._stripFileToId(extruder_stack_file)

                container_stacks = self._container_registry.findContainerStacks(id = container_id)
                if container_stacks:
                    # this container stack already exists, try to resolve
                    stack = container_stacks[0]
                    if self._resolve_strategies["machine"] == "override":
                        pass  # do nothing
                    elif self._resolve_strategies["machine"] == "new":
                        # create a new extruder stack from this one
                        new_id = self.getNewId(container_id)
                        stack = ExtruderStack(new_id)
                        stack.deserialize(archive.open(extruder_stack_file).read().decode("utf-8"))

                        # Ensure a unique ID and name
                        stack._id = new_id

                        self._container_registry.addContainer(stack)
                        extruder_stacks_added.append(stack)
                else:
                    # container not found, create a new one
                    stack = ExtruderStack(container_id)
                    stack.deserialize(archive.open(extruder_stack_file).read().decode("utf-8"))
                    self._container_registry.addContainer(stack)
                    extruder_stacks_added.append(stack)

                extruder_stacks.append(stack)

        except:
            Logger.logException("w", "We failed to serialize the stack. Trying to clean up.")
            # Something went really wrong. Try to remove any data that we added.
            for container in extruder_stacks:
                self._container_registry.removeContainer(container.getId())

            return None

        # load global stack file
        try:
            container_id = self._stripFileToId(global_stack_file)

            # Check if a stack by this ID already exists;
            container_stacks = self._container_registry.findContainerStacks(id = container_id)
            if container_stacks:
                stack = container_stacks[0]

                if self._resolve_strategies["machine"] == "override":
                    # TODO: HACK
                    # There is a machine, check if it has authentication data. If so, keep that data.
                    network_authentication_id = container_stacks[0].getMetaDataEntry("network_authentication_id")
                    network_authentication_key = container_stacks[0].getMetaDataEntry("network_authentication_key")
                    container_stacks[0].deserialize(archive.open(global_stack_file).read().decode("utf-8"))
                    if network_authentication_id:
                        container_stacks[0].addMetaDataEntry("network_authentication_id", network_authentication_id)
                    if network_authentication_key:
                        container_stacks[0].addMetaDataEntry("network_authentication_key", network_authentication_key)
                elif self._resolve_strategies["machine"] == "new":
                    new_id = self.getNewId(container_id)
                    stack = GlobalStack(new_id)
                    stack.deserialize(archive.open(global_stack_file).read().decode("utf-8"))

                    # Ensure a unique ID and name
                    stack._id = new_id

                    # Extruder stacks are "bound" to a machine. If we add the machine as a new one, the id of the
                    # bound machine also needs to change.
                    if stack.getMetaDataEntry("machine", None):
                        stack.setMetaDataEntry("machine", self.getNewId(stack.getMetaDataEntry("machine")))

                    # Only machines need a new name, stacks may be non-unique
                    stack.setName(self._container_registry.uniqueName(stack.getName()))
                    container_stacks_added.append(stack)
                    self._container_registry.addContainer(stack)
                else:
                    Logger.log("w", "Resolve strategy of %s for machine is not supported", self._resolve_strategies["machine"])
            else:
                # no existing container stack, so we create a new one
                stack = GlobalStack(container_id)
                # Deserialize stack by converting read data from bytes to string
                stack.deserialize(archive.open(global_stack_file).read().decode("utf-8"))
                container_stacks_added.append(stack)
                self._container_registry.addContainer(stack)

            global_stack = stack
            Job.yieldThread()
        except:
            Logger.logException("w", "We failed to serialize the stack. Trying to clean up.")
            # Something went really wrong. Try to remove any data that we added. 
            for container in containers_to_add:
                self._container_registry.removeContainer(container.getId())

            for container in container_stacks_added:
                self._container_registry.removeContainer(container.getId())

            for container in extruder_stacks_added:
                self._container_registry.removeContainer(container.getId())

            return None

        if self._resolve_strategies["machine"] == "new":
            # A new machine was made, but it was serialized with the wrong user container. Fix that now.
            for container in user_instance_containers:
                extruder_id = container.getMetaDataEntry("extruder", None)
                if extruder_id:
                    for extruder in extruder_stacks:
                        if extruder.getId() == extruder_id:
                            extruder.replaceContainer(0, container)
                            continue
                machine_id = container.getMetaDataEntry("machine", None)
                if machine_id:
                    if global_stack.getId() == machine_id:
                        global_stack.replaceContainer(0, container)
                        continue

        for container_type in ("quality_changes", "definition_changes"):
            if self._resolve_strategies[container_type] == "new":
                # Quality changes needs to get a new ID, added to registry and to the right stacks
                for container in quality_and_definition_changes_instance_containers:
                    old_id = container.getId()
                    container.setName(self._container_registry.uniqueName(container.getName()))
                    # We're not really supposed to change the ID in normal cases, but this is an exception.
                    container._id = self.getNewId(container.getId())

                    # The container was not added yet, as it didn't have an unique ID. It does now, so add it.
                    self._container_registry.addContainer(container)

                    # Replace the quality/definition changes container
                    old_container = global_stack.findContainer({"type": container_type})
                    if old_container.getId() == old_id:
                        changes_index = global_stack.getContainerIndex(old_container)
                        global_stack.replaceContainer(changes_index, container)
                        continue

                    for stack in extruder_stacks:
                        old_container = stack.findContainer({"type": container_type})
                        if old_container.getId() == old_id:
                            changes_index = stack.getContainerIndex(old_container)
                            stack.replaceContainer(changes_index, container)

        if self._resolve_strategies["material"] == "new":
            for material in material_containers:
                old_material = global_stack.findContainer({"type": "material"})
                if old_material.getId() in self._id_mapping:
                    material_index = global_stack.getContainerIndex(old_material)
                    global_stack.replaceContainer(material_index, material)
                    continue

                for stack in extruder_stacks:
                    old_material = stack.findContainer({"type": "material"})
                    if old_material.getId() in self._id_mapping:
                        material_index = stack.getContainerIndex(old_material)
                        stack.replaceContainer(material_index, material)
                        continue

        for stack in extruder_stacks:
            ExtruderManager.getInstance().registerExtruder(stack, global_stack.getId())
        else:
            # Machine has no extruders, but it needs to be registered with the extruder manager.
            ExtruderManager.getInstance().registerExtruder(None, global_stack.getId())

        Logger.log("d", "Workspace loading is notifying rest of the code of changes...")

        # Notify everything/one that is to notify about changes.
        global_stack.containersChanged.emit(global_stack.getTop())

        # if we are reusing an existing global stack, it can already have extruders associated, so we need to remove
        # them first
        for extruder_stack in old_extruder_stacks:
            if extruder_stack not in extruder_stacks:  # skip new ones
                self._container_registry.removeContainer(extruder_stack.getId())

        for stack in extruder_stacks:
            stack.setNextStack(global_stack)
            stack.containersChanged.emit(stack.getTop())

        # Actually change the active machine.
        Application.getInstance().setGlobalContainerStack(global_stack)

        # Load all the nodes / meshdata of the workspace
        nodes = self._3mf_mesh_reader.read(file_name)
        if nodes is None:
            nodes = []
        return nodes

    def _stripFileToId(self, file):
        mime_type = MimeTypeDatabase.getMimeTypeForFile(file)
        file = mime_type.stripExtension(file)
        return file.replace("Cura/", "")

    def _getXmlProfileClass(self):
        return self._container_registry.getContainerForMimeType(MimeTypeDatabase.getMimeType("application/x-ultimaker-material-profile"))

    ##  Get the list of ID's of all containers in a container stack by partially parsing it's serialized data.
    def _getContainerIdListFromSerialized(self, serialized):
        parser = configparser.ConfigParser(interpolation=None, empty_lines_in_values=False)
        parser.read_string(serialized)

        container_ids = []
        if "containers" in parser:
            for index, container_id in parser.items("containers"):
                container_ids.append(container_id)
        elif parser.has_option("general", "containers"):
            container_string = parser["general"].get("containers", "")
            container_list = container_string.split(",")
            container_ids = [container_id for container_id in container_list if container_id != ""]

        return container_ids

    def _getMachineNameFromSerializedStack(self, serialized):
        parser = configparser.ConfigParser(interpolation=None, empty_lines_in_values=False)
        parser.read_string(serialized)
        return parser["general"].get("name", "")

    def _getMaterialLabelFromSerialized(self, serialized):
        data = ET.fromstring(serialized)
        metadata = data.iterfind("./um:metadata/um:name/um:label", {"um": "http://www.ultimaker.com/material"})
        for entry in metadata:
            return entry.text
        pass