Python Task.create_subtask方法代码示例

# 需要导入模块: from nailgun.db.sqlalchemy.models import Task [as 别名]
# 或者: from nailgun.db.sqlalchemy.models.Task import create_subtask [as 别名]
    def test_proper_progress_calculation(self):
        supertask = Task(uuid=str(uuid.uuid4()), name="super", status="running")

        self.db.add(supertask)
        self.db.commit()

        subtask_weight = 0.4
        task_deletion = supertask.create_subtask("node_deletion", weight=subtask_weight)
        task_provision = supertask.create_subtask("provision", weight=subtask_weight)

        subtask_progress = random.randint(1, 20)

        deletion_kwargs = {"task_uuid": task_deletion.uuid, "progress": subtask_progress, "status": "running"}
        provision_kwargs = {"task_uuid": task_provision.uuid, "progress": subtask_progress, "status": "running"}

        self.receiver.provision_resp(**provision_kwargs)
        self.db.commit()
        self.receiver.remove_nodes_resp(**deletion_kwargs)
        self.db.commit()

        self.db.refresh(task_deletion)
        self.db.refresh(task_provision)
        self.db.refresh(supertask)

        calculated_progress = helpers.TaskHelper.calculate_parent_task_progress([task_deletion, task_provision])

        self.assertEqual(supertask.progress, calculated_progress)

# 需要导入模块: from nailgun.db.sqlalchemy.models import Task [as 别名]
# 或者: from nailgun.db.sqlalchemy.models.Task import create_subtask [as 别名]
    def test_node_deletion_subtask_progress(self):
        supertask = Task(
            uuid=str(uuid.uuid4()),
            name="super",
            status="running"
        )

        self.db.add(supertask)
        self.db.commit()

        task_deletion = supertask.create_subtask("node_deletion")
        task_provision = supertask.create_subtask("provision", weight=0.4)

        subtask_progress = random.randint(1, 20)

        deletion_kwargs = {'task_uuid': task_deletion.uuid,
                           'progress': subtask_progress}
        provision_kwargs = {'task_uuid': task_provision.uuid,
                            'progress': subtask_progress}

        def progress_difference():
            self.receiver.provision_resp(**provision_kwargs)

            self.db.refresh(task_provision)
            self.assertEqual(task_provision.progress, subtask_progress)

            self.db.refresh(supertask)
            progress_before_delete_subtask = supertask.progress

            self.receiver.remove_nodes_resp(**deletion_kwargs)

            self.db.refresh(task_deletion)
            self.assertEqual(task_deletion.progress, subtask_progress)

            self.db.refresh(supertask)
            progress_after_delete_subtask = supertask.progress

            return abs(progress_after_delete_subtask -
                       progress_before_delete_subtask)

        without_coeff = progress_difference()

        task_deletion.progress = 0
        task_deletion.weight = 0.5
        self.db.merge(task_deletion)

        task_provision.progress = 0
        self.db.merge(task_provision)

        supertask.progress = 0
        self.db.merge(supertask)

        self.db.commit()

        with_coeff = progress_difference()

        # some freaking magic is here but haven't found
        # better way to test what is already working
        self.assertTrue((without_coeff / with_coeff) < 2)

# 需要导入模块: from nailgun.db.sqlalchemy.models import Task [as 别名]
# 或者: from nailgun.db.sqlalchemy.models.Task import create_subtask [as 别名]
    def execute(self, force=False, **kwargs):
        try:
            self.clear_tasks_history(force=force)
        except errors.TaskAlreadyRunning:
            raise errors.DeploymentAlreadyStarted(
                "Can't reset environment '{0}' when "
                "running deployment task exists.".format(
                    self.cluster.id
                )
            )

        # FIXME(aroma): remove updating of 'deployed_before'
        # when stop action is reworked. 'deployed_before'
        # flag identifies whether stop action is allowed for the
        # cluster. Please, refer to [1] for more details.
        # [1]: https://bugs.launchpad.net/fuel/+bug/1529691
        objects.Cluster.set_deployed_before_flag(self.cluster, value=False)

        nodes = objects.Cluster.get_nodes_by_role(
            self.cluster, consts.VIRTUAL_NODE_TYPES.virt
        )
        for node in nodes:
            objects.Node.reset_vms_created_state(node)

        objects.ClusterPluginLinkCollection.delete_by_cluster_id(
            self.cluster.id)

        db().commit()

        supertask = Task(
            name=consts.TASK_NAMES.reset_environment,
            cluster=self.cluster
        )
        db().add(supertask)
        al = TaskHelper.create_action_log(supertask)

        reset_nodes = supertask.create_subtask(
            consts.TASK_NAMES.reset_nodes
        )

        remove_keys_task = supertask.create_subtask(
            consts.TASK_NAMES.remove_keys
        )

        remove_ironic_bootstrap_task = supertask.create_subtask(
            consts.TASK_NAMES.remove_ironic_bootstrap
        )

        db.commit()

        rpc.cast('naily', [
            tasks.ResetEnvironmentTask.message(reset_nodes),
            tasks.RemoveIronicBootstrap.message(remove_ironic_bootstrap_task),
            tasks.RemoveClusterKeys.message(remove_keys_task)
        ])
        TaskHelper.update_action_log(supertask, al)
        return supertask

# 需要导入模块: from nailgun.db.sqlalchemy.models import Task [as 别名]
# 或者: from nailgun.db.sqlalchemy.models.Task import create_subtask [as 别名]
    def test_task_contains_field_parent(self):
        parent_task = Task(
            name=consts.TASK_NAMES.deployment,
            cluster=self.cluster_db,
            status=consts.TASK_STATUSES.running,
            progress=10
        )
        child_task = parent_task.create_subtask(
            name=consts.TASK_NAMES.deployment,
            status=consts.TASK_STATUSES.running,
            progress=10
        )

        cluster_tasks = self.app.get(
            reverse(
                'TaskCollectionHandler',
                kwargs={'cluster_id': self.cluster_db.id}
            ),
            headers=self.default_headers
        ).json_body

        child_task_data = next(
            t for t in cluster_tasks if t['id'] == child_task.id
        )

        self.assertEqual(parent_task.id, child_task_data['parent_id'])
        parent_task_data = next(
            t for t in cluster_tasks if t['id'] == parent_task.id
        )
        self.assertIsNone(parent_task_data['parent_id'])

# 需要导入模块: from nailgun.db.sqlalchemy.models import Task [as 别名]
# 或者: from nailgun.db.sqlalchemy.models.Task import create_subtask [as 别名]
    def execute(self):
        deploy_running = db().query(Task).filter_by(
            cluster=self.cluster,
            name=consts.TASK_NAMES.deploy,
            status='running'
        ).first()
        if deploy_running:
            raise errors.DeploymentAlreadyStarted(
                u"Can't reset environment '{0}' when "
                u"deployment is running".format(
                    self.cluster.id
                )
            )

        obsolete_tasks = db().query(Task).filter_by(
            cluster_id=self.cluster.id,
        ).filter(
            Task.name.in_([
                consts.TASK_NAMES.deploy,
                consts.TASK_NAMES.deployment,
                consts.TASK_NAMES.stop_deployment
            ])
        )

        for task in obsolete_tasks:
            db().delete(task)

        nodes = objects.Cluster.get_nodes_by_role(
            self.cluster, consts.VIRTUAL_NODE_TYPES.virt)
        for node in nodes:
            objects.Node.reset_vms_created_state(node)

        db().commit()

        supertask = Task(
            name=consts.TASK_NAMES.reset_environment,
            cluster=self.cluster
        )
        db().add(supertask)
        al = TaskHelper.create_action_log(supertask)

        remove_keys_task = supertask.create_subtask(
            consts.TASK_NAMES.reset_environment
        )

        db.commit()

        rpc.cast('naily', [
            tasks.ResetEnvironmentTask.message(supertask),
            tasks.RemoveClusterKeys.message(remove_keys_task)
        ])
        TaskHelper.update_action_log(supertask, al)
        return supertask

# 需要导入模块: from nailgun.db.sqlalchemy.models import Task [as 别名]
# 或者: from nailgun.db.sqlalchemy.models.Task import create_subtask [as 别名]
    def execute(self):
        logger.info(
            u"Trying to start deployment at cluster '{0}'".format(
                self.cluster.name or self.cluster.id
            )
        )

        network_info = self.serialize_network_cfg(self.cluster)
        logger.info(
            u"Network info:\n{0}".format(
                json.dumps(network_info, indent=4)
            )
        )

        current_tasks = db().query(Task).filter_by(
            cluster_id=self.cluster.id,
            name='deploy')

        for task in current_tasks:
            if task.status == "running":
                raise errors.DeploymentAlreadyStarted()
            elif task.status in ("ready", "error"):
                db().delete(task)
                db().commit()

        obsolete_tasks = db().query(Task).filter_by(
            cluster_id=self.cluster.id,
        ).filter(
            Task.name.in_([
                'stop_deployment',
                'reset_environment'
            ])
        )
        for task in obsolete_tasks:
            db().delete(task)
        db().commit()

        task_messages = []

        nodes_to_delete = TaskHelper.nodes_to_delete(self.cluster)
        nodes_to_deploy = TaskHelper.nodes_to_deploy(self.cluster)
        nodes_to_provision = TaskHelper.nodes_to_provision(self.cluster)

        if not any([nodes_to_provision, nodes_to_deploy, nodes_to_delete]):
            raise errors.WrongNodeStatus("No changes to deploy")

        supertask = Task(name='deploy', cluster=self.cluster)
        db().add(supertask)
        db().commit()

        # Run validation if user didn't redefine
        # provisioning and deployment information
        if not self.cluster.replaced_provisioning_info \
           and not self.cluster.replaced_deployment_info:
            try:
                self.check_before_deployment(supertask)
            except errors.CheckBeforeDeploymentError:
                return supertask

        # in case of Red Hat
        if self.cluster.release.operating_system == "RHEL":
            try:
                redhat_messages = self._redhat_messages(
                    supertask,
                    # provision only?
                    [
                        {"uid": n.id, "platform_name": n.platform_name}
                        for n in nodes_to_provision
                    ]
                )
            except Exception as exc:
                TaskHelper.update_task_status(
                    supertask.uuid,
                    status='error',
                    progress=100,
                    msg=str(exc)
                )
                return supertask
            task_messages.extend(redhat_messages)
        # /in case of Red Hat

        task_deletion, task_provision, task_deployment = None, None, None

        if nodes_to_delete:
            task_deletion = supertask.create_subtask("node_deletion")
            logger.debug("Launching deletion task: %s", task_deletion.uuid)
            self._call_silently(task_deletion, tasks.DeletionTask)

        if nodes_to_provision:
            TaskHelper.update_slave_nodes_fqdn(nodes_to_provision)
            logger.debug("There are nodes to provision: %s",
                         " ".join([n.fqdn for n in nodes_to_provision]))
            task_provision = supertask.create_subtask("provision")
            # For more accurate progress calulation
            task_provision.weight = 0.4
            provision_message = self._call_silently(
                task_provision,
                tasks.ProvisionTask,
                nodes_to_provision,
                method_name='message'
#.........这里部分代码省略.........

# 需要导入模块: from nailgun.db.sqlalchemy.models import Task [as 别名]
# 或者: from nailgun.db.sqlalchemy.models.Task import create_subtask [as 别名]
    def execute(self, **kwargs):

        # FIXME(aroma): remove updating of 'deployed_before'
        # when stop action is reworked. 'deployed_before'
        # flag identifies whether stop action is allowed for the
        # cluster. Please, refer to [1] for more details.
        # [1]: https://bugs.launchpad.net/fuel/+bug/1529691
        objects.Cluster.set_deployed_before_flag(self.cluster, value=False)

        deploy_running = db().query(Task).filter_by(
            cluster=self.cluster,
            name=consts.TASK_NAMES.deploy,
            status='running'
        ).first()
        if deploy_running:
            raise errors.DeploymentAlreadyStarted(
                u"Can't reset environment '{0}' when "
                u"deployment is running".format(
                    self.cluster.id
                )
            )

        obsolete_tasks = db().query(Task).filter_by(
            cluster_id=self.cluster.id,
        ).filter(
            Task.name.in_([
                consts.TASK_NAMES.deploy,
                consts.TASK_NAMES.deployment,
                consts.TASK_NAMES.stop_deployment
            ])
        )

        for task in obsolete_tasks:
            db().delete(task)

        nodes = objects.Cluster.get_nodes_by_role(
            self.cluster, consts.VIRTUAL_NODE_TYPES.virt)
        for node in nodes:
            objects.Node.reset_vms_created_state(node)

        db().commit()

        supertask = Task(
            name=consts.TASK_NAMES.reset_environment,
            cluster=self.cluster
        )
        db().add(supertask)
        al = TaskHelper.create_action_log(supertask)

        remove_keys_task = supertask.create_subtask(
            consts.TASK_NAMES.reset_environment
        )

        remove_ironic_bootstrap_task = supertask.create_subtask(
            consts.TASK_NAMES.reset_environment
        )

        db.commit()

        rpc.cast('naily', [
            tasks.ResetEnvironmentTask.message(supertask),
            tasks.RemoveIronicBootstrap.message(remove_ironic_bootstrap_task),
            tasks.RemoveClusterKeys.message(remove_keys_task)
        ])
        TaskHelper.update_action_log(supertask, al)
        return supertask

# 需要导入模块: from nailgun.db.sqlalchemy.models import Task [as 别名]
# 或者: from nailgun.db.sqlalchemy.models.Task import create_subtask [as 别名]
    def execute(self, nodes_to_delete, mclient_remove=True):
        cluster_id = None
        if hasattr(self, 'cluster'):
            cluster_id = self.cluster.id
            objects.TaskCollection.lock_cluster_tasks(cluster_id)

        logger.info("Trying to execute node deletion task with nodes %s",
                    ', '.join(str(node.id) for node in nodes_to_delete))

        self.verify_nodes_with_cluster(nodes_to_delete)
        objects.NodeCollection.lock_nodes(nodes_to_delete)

        if cluster_id is None:
            # DeletionTask operates on cluster's nodes.
            # Nodes that are not in cluster are simply deleted.

            objects.NodeCollection.delete_by_ids([
                n.id for n in nodes_to_delete])
            db().flush()

            task = Task(name=consts.TASK_NAMES.node_deletion,
                        progress=100,
                        status=consts.TASK_STATUSES.ready)
            db().add(task)
            db().flush()

            return task

        task = Task(name=consts.TASK_NAMES.node_deletion,
                    cluster=self.cluster)
        db().add(task)
        for node in nodes_to_delete:
            objects.Node.update(node,
                                {'status': consts.NODE_STATUSES.removing})
        db().flush()

        nodes_to_deploy = []
        objects.Cluster.adjust_nodes_lists_on_controller_removing(
            self.cluster, nodes_to_delete, nodes_to_deploy)

        if nodes_to_deploy:
            objects.NodeCollection.lock_nodes(nodes_to_deploy)
            # updating nodes
            objects.NodeCollection.update_slave_nodes_fqdn(nodes_to_deploy)
            logger.debug("There are nodes to deploy: %s",
                         " ".join([n.fqdn for n in nodes_to_deploy]))
            task_deployment = task.create_subtask(
                consts.TASK_NAMES.deployment)

            deployment_message = self._call_silently(
                task_deployment,
                tasks.DeploymentTask,
                nodes_to_deploy,
                method_name='message'
            )
            db().flush()

            # if failed to generate task message for orchestrator
            # then task is already set to error
            if task_deployment.status == consts.TASK_STATUSES.error:
                return task_deployment

            rpc.cast('naily', [deployment_message])

        db().commit()

        self._call_silently(
            task,
            tasks.DeletionTask,
            nodes=tasks.DeletionTask.prepare_nodes_for_task(
                nodes_to_delete, mclient_remove=mclient_remove))

        return task

# 需要导入模块: from nailgun.db.sqlalchemy.models import Task [as 别名]
# 或者: from nailgun.db.sqlalchemy.models.Task import create_subtask [as 别名]
    def execute(self):
        #开始执行部署变更
        logger.info(
            u"Trying to start deployment at cluster '{0}'".format(
                self.cluster.name or self.cluster.id
            )
        )
        #显示网络信息
        network_info = self.serialize_network_cfg(self.cluster)
        logger.info(
            u"Network info:\n{0}".format(
                jsonutils.dumps(network_info, indent=4)
            )
        )

        self._remove_obsolete_tasks() #obsolete 过时的

        supertask = Task(name=TASK_NAMES.deploy, cluster=self.cluster)
        db().add(supertask)

        nodes_to_delete = TaskHelper.nodes_to_delete(self.cluster)
        nodes_to_deploy = TaskHelper.nodes_to_deploy(self.cluster)
        nodes_to_provision = TaskHelper.nodes_to_provision(self.cluster)

        task_messages = []
        #如果是openstack环境,就执行原来的判断看集群中是否有节点的变化
        if self.cluster.cluster_type==1:
           if not any([nodes_to_provision, nodes_to_deploy, nodes_to_delete]):
              db().rollback()
              raise errors.WrongNodeStatus("No changes to deploy")

        # we should have task committed for processing in other threads
        db().commit()
        TaskHelper.create_action_log(supertask)

        # Run validation if user didn't redefine
        # provisioning and deployment information

        if (not objects.Cluster.get_provisioning_info(self.cluster) and
                not objects.Cluster.get_deployment_info(self.cluster)):
            try:
                if self.cluster.cluster_type==1:
                   self.check_before_deployment(supertask)
            except errors.CheckBeforeDeploymentError:
                db().commit()
                return supertask

        task_deletion, task_provision, task_deployment = None, None, None

        if nodes_to_delete:
            objects.TaskCollection.lock_cluster_tasks(self.cluster.id)
            # For more accurate progress calculation
            task_weight = 0.4
            task_deletion = supertask.create_subtask(TASK_NAMES.node_deletion,
                                                     weight=task_weight)
            logger.debug("Launching deletion task: %s", task_deletion.uuid)

            self._call_silently(task_deletion, tasks.DeletionTask)
            # we should have task committed for processing in other threads
            db().commit()

        if nodes_to_provision:
            objects.TaskCollection.lock_cluster_tasks(self.cluster.id)
            # updating nodes
            nodes_to_provision = objects.NodeCollection.lock_nodes(
                nodes_to_provision
            )
            objects.NodeCollection.update_slave_nodes_fqdn(nodes_to_provision)
            logger.debug("There are nodes to provision: %s",
                         " ".join([n.fqdn for n in nodes_to_provision]))

            # For more accurate progress calulation
            task_weight = 0.4
            task_provision = supertask.create_subtask(TASK_NAMES.provision,
                                                      weight=task_weight)

            # we should have task committed for processing in other threads
            db().commit()
            provision_message = self._call_silently(
                task_provision,
                tasks.ProvisionTask,
                nodes_to_provision,
                method_name='message'
            )

            task_provision = objects.Task.get_by_uid(
                task_provision.id,
                fail_if_not_found=True,
                lock_for_update=True
            )
            # if failed to generate task message for orchestrator
            # then task is already set to error
            if task_provision.status == TASK_STATUSES.error:
                return supertask

            task_provision.cache = provision_message
            db().commit()
            task_messages.append(provision_message)
        else:
            pass
#.........这里部分代码省略.........

# 需要导入模块: from nailgun.db.sqlalchemy.models import Task [as 别名]
# 或者: from nailgun.db.sqlalchemy.models.Task import create_subtask [as 别名]
    def execute(self):
        # 开始执行部署变更
        logger.info(u"Trying to start deployment at cluster '{0}'".format(self.cluster.name or self.cluster.id))
        # 显示网络信息(openstack部署前执行网络验证)
        network_info = self.serialize_network_cfg(self.cluster)
        logger.info(u"Network info:\n{0}".format(jsonutils.dumps(network_info, indent=4)))

        self._remove_obsolete_tasks()  # obsolete 过时的

        supertask = Task(name=TASK_NAMES.deploy, cluster=self.cluster)
        db().add(supertask)

        nodes_to_delete = TaskHelper.nodes_to_delete(self.cluster)
        nodes_to_deploy = TaskHelper.nodes_to_deploy(self.cluster)
        nodes_to_provision = TaskHelper.nodes_to_provision(self.cluster)

        task_messages = []
        # 如果是openstack环境,就执行原来流程判断看集群中是否有节点的变化
        if self.cluster.cluster_type == 1:
            if not any([nodes_to_provision, nodes_to_deploy, nodes_to_delete]):
                db().rollback()
                raise errors.WrongNodeStatus("No changes to deploy")

        # we should have task committed for processing in other threads
        db().commit()
        TaskHelper.create_action_log(supertask)

        # Run validation if user didn't redefine
        # provisioning and deployment information

        if not objects.Cluster.get_provisioning_info(self.cluster) and not objects.Cluster.get_deployment_info(
            self.cluster
        ):
            try:
                if self.cluster.cluster_type == 1:
                    self.check_before_deployment(supertask)
            except errors.CheckBeforeDeploymentError:
                db().commit()
                return supertask

        task_deletion, task_provision, task_deployment = None, None, None

        if nodes_to_delete:
            objects.TaskCollection.lock_cluster_tasks(self.cluster.id)
            # For more accurate progress calculation
            task_weight = 0.4
            task_deletion = supertask.create_subtask(TASK_NAMES.node_deletion, weight=task_weight)
            logger.debug("Launching deletion task: %s", task_deletion.uuid)

            self._call_silently(task_deletion, tasks.DeletionTask)
            # we should have task committed for processing in other threads
            db().commit()

        if nodes_to_provision:
            objects.TaskCollection.lock_cluster_tasks(self.cluster.id)
            # updating nodes
            nodes_to_provision = objects.NodeCollection.lock_nodes(nodes_to_provision)
            objects.NodeCollection.update_slave_nodes_fqdn(nodes_to_provision)
            logger.debug("There are nodes to provision: %s", " ".join([n.fqdn for n in nodes_to_provision]))

            # For more accurate progress calulation
            task_weight = 0.4
            task_provision = supertask.create_subtask(TASK_NAMES.provision, weight=task_weight)

            # we should have task committed for processing in other threads
            db().commit()
            provision_message = self._call_silently(
                task_provision, tasks.ProvisionTask, nodes_to_provision, method_name="message"
            )

            task_provision = objects.Task.get_by_uid(task_provision.id, fail_if_not_found=True, lock_for_update=True)
            # if failed to generate task message for orchestrator
            # then task is already set to error
            if task_provision.status == TASK_STATUSES.error:
                return supertask

            task_provision.cache = provision_message
            db().commit()
            task_messages.append(provision_message)
        else:
            pass

        # nodes_to_deploy=self.cluster.nodes
        if nodes_to_deploy:
            objects.TaskCollection.lock_cluster_tasks(self.cluster.id)
            # locking nodes before updating
            objects.NodeCollection.lock_nodes(nodes_to_deploy)
            # updating nodes
            objects.NodeCollection.update_slave_nodes_fqdn(nodes_to_deploy)
            logger.debug("There are nodes to deploy: %s", " ".join([n.fqdn for n in nodes_to_deploy]))
            task_deployment = supertask.create_subtask(TASK_NAMES.deployment)

            # we should have task committed for processing in other threads
            db().commit()
            deployment_message = self._call_silently(
                task_deployment, tasks.DeploymentTask, nodes_to_deploy, method_name="message"
            )

            # clusterdeploymsg = ClusterdeployMsg(cluster_id=self.cluster.id,cluster_deploymsg='deployment_message')
            # db().add(clusterdeploymsg)
#.........这里部分代码省略.........

# 需要导入模块: from nailgun.db.sqlalchemy.models import Task [as 别名]
# 或者: from nailgun.db.sqlalchemy.models.Task import create_subtask [as 别名]
    def execute(self):
        logger.info(
            u"Trying to start deployment at cluster '{0}'".format(
                self.cluster.name or self.cluster.id
            )
        )

        network_info = self.serialize_network_cfg(self.cluster)
        logger.info(
            u"Network info:\n{0}".format(
                jsonutils.dumps(network_info, indent=4)
            )
        )

        self._remove_obsolete_tasks()

        supertask = Task(name=TASK_NAMES.deploy, cluster=self.cluster)
        db().add(supertask)
        # we should have task committed for processing in other threads
        db().commit()

        nodes_to_delete = TaskHelper.nodes_to_delete(self.cluster)
        nodes_to_deploy = TaskHelper.nodes_to_deploy(self.cluster)
        nodes_to_provision = TaskHelper.nodes_to_provision(self.cluster)

        task_messages = []
        if not any([nodes_to_provision, nodes_to_deploy, nodes_to_delete]):
            db().rollback()
            raise errors.WrongNodeStatus("No changes to deploy")

        # Run validation if user didn't redefine
        # provisioning and deployment information
        if not self.cluster.replaced_provisioning_info and \
                not self.cluster.replaced_deployment_info:
            try:
                self.check_before_deployment(supertask)
            except errors.CheckBeforeDeploymentError:
                db().commit()
                return supertask

        task_deletion, task_provision, task_deployment = None, None, None

        if nodes_to_delete:
            objects.TaskCollection.lock_cluster_tasks(self.cluster.id)
            # For more accurate progress calculation
            task_weight = 0.4
            task_deletion = supertask.create_subtask(TASK_NAMES.node_deletion,
                                                     weight=task_weight)
            logger.debug("Launching deletion task: %s", task_deletion.uuid)
            # we should have task committed for processing in other threads
            db().commit()
            self._call_silently(task_deletion, tasks.DeletionTask)

        if nodes_to_provision:
            objects.TaskCollection.lock_cluster_tasks(self.cluster.id)
            # updating nodes
            nodes_to_provision = objects.NodeCollection.lock_nodes(
                nodes_to_provision
            )
            objects.NodeCollection.update_slave_nodes_fqdn(nodes_to_provision)
            logger.debug("There are nodes to provision: %s",
                         " ".join([n.fqdn for n in nodes_to_provision]))

            # For more accurate progress calulation
            task_weight = 0.4
            task_provision = supertask.create_subtask(TASK_NAMES.provision,
                                                      weight=task_weight)
            # we should have task committed for processing in other threads
            db().commit()
            provision_message = self._call_silently(
                task_provision,
                tasks.ProvisionTask,
                nodes_to_provision,
                method_name='message'
            )

            task_provision = objects.Task.get_by_uid(
                task_provision.id,
                fail_if_not_found=True,
                lock_for_update=True
            )
            # if failed to generate task message for orchestrator
            # then task is already set to error
            if task_provision.status == TASK_STATUSES.error:
                return supertask

            task_provision.cache = provision_message
            db().commit()
            task_messages.append(provision_message)

        if nodes_to_deploy:
            objects.TaskCollection.lock_cluster_tasks(self.cluster.id)
            # locking nodes before updating
            objects.NodeCollection.lock_nodes(nodes_to_deploy)
            # updating nodes
            objects.NodeCollection.update_slave_nodes_fqdn(nodes_to_deploy)
            logger.debug("There are nodes to deploy: %s",
                         " ".join([n.fqdn for n in nodes_to_deploy]))
            task_deployment = supertask.create_subtask(TASK_NAMES.deployment)
            # we should have task committed for processing in other threads
#.........这里部分代码省略.........