# -*- coding: utf-8 -*- ########################################################################### # Copyright (c), The AiiDA team. All rights reserved. # # This file is part of the AiiDA code. # # # # The code is hosted on GitHub at https://github.com/aiidateam/aiida-core # # For further information on the license, see the LICENSE.txt file # # For further information please visit http://www.aiida.net # ########################################################################### """Django implementation of the `BackendNode` and `BackendNodeCollection` classes.""" # pylint: disable=import-error,no-name-in-module from datetime import datetime from django.core.exceptions import ObjectDoesNotExist from django.db import transaction, IntegrityError from aiida.backends.djsite.db import models from aiida.common import exceptions from aiida.common.lang import type_check from aiida.orm.implementation.utils import clean_value from .. import BackendNode, BackendNodeCollection from . import entities from . import utils as dj_utils from .computers import DjangoComputer from .users import DjangoUser [docs]class DjangoNode(entities.DjangoModelEntity[models.DbNode], BackendNode): """Django Node backend entity""" # pylint: disable=too-many-public-methods MODEL_CLASS = models.DbNode LINK_CLASS = models.DbLink [docs] def __init__( self, backend, node_type, user, computer=None, process_type=None, label='', description='', ctime=None, mtime=None ): """Construct a new `BackendNode` instance wrapping a new `DbNode` instance. :param backend: the backend :param node_type: the node type string :param user: associated `BackendUser` :param computer: associated `BackendComputer` :param label: string label :param description: string description :param ctime: The creation time as datetime object :param mtime: The modification time as datetime object """ # pylint: disable=too-many-arguments super().__init__(backend) arguments = { 'user': user.dbmodel, 'node_type': node_type, 'process_type': process_type, 'label': label, 'description': description, } type_check(user, DjangoUser) if computer: type_check(computer, DjangoComputer, f'computer is of type {type(computer)}') arguments['dbcomputer'] = computer.dbmodel if ctime: type_check(ctime, datetime, f'the given ctime is of type {type(ctime)}') arguments['ctime'] = ctime if mtime: type_check(mtime, datetime, f'the given mtime is of type {type(mtime)}') arguments['mtime'] = mtime self._dbmodel = dj_utils.ModelWrapper(models.DbNode(**arguments)) [docs] def clone(self): """Return an unstored clone of ourselves. :return: an unstored `BackendNode` with the exact same attributes and extras as self """ arguments = { 'node_type': self._dbmodel.node_type, 'process_type': self._dbmodel.process_type, 'user': self._dbmodel.user, 'dbcomputer': self._dbmodel.dbcomputer, 'label': self._dbmodel.label, 'description': self._dbmodel.description, } clone = self.__class__.__new__(self.__class__) # pylint: disable=no-value-for-parameter clone.__init__(self.backend, self.node_type, self.user) clone._dbmodel = dj_utils.ModelWrapper(models.DbNode(**arguments)) # pylint: disable=protected-access return clone @property def computer(self): """Return the computer of this node. :return: the computer or None :rtype: `BackendComputer` or None """ try: return self.backend.computers.from_dbmodel(self._dbmodel.dbcomputer) except TypeError: return None @computer.setter def computer(self, computer): """Set the computer of this node. :param computer: a `BackendComputer` """ type_check(computer, DjangoComputer, allow_none=True) if computer is not None: computer = computer.dbmodel self._dbmodel.dbcomputer = computer @property def user(self): """Return the user of this node. :return: the user :rtype: `BackendUser` """ return self.backend.users.from_dbmodel(self._dbmodel.user) @user.setter def user(self, user): """Set the user of this node. :param user: a `BackendUser` """ type_check(user, DjangoUser) self._dbmodel.user = user.dbmodel [docs] def add_incoming(self, source, link_type, link_label): """Add a link of the given type from a given node to ourself. :param source: the node from which the link is coming :param link_type: the link type :param link_label: the link label :return: True if the proposed link is allowed, False otherwise :raise aiida.common.ModificationNotAllowed: if either source or target node is not stored """ type_check(source, DjangoNode) if not self.is_stored: raise exceptions.ModificationNotAllowed('node has to be stored when adding an incoming link') if not source.is_stored: raise exceptions.ModificationNotAllowed('source node has to be stored when adding a link from it') self._add_link(source, link_type, link_label) [docs] def _add_link(self, source, link_type, link_label): """Add a link of the given type from a given node to ourself. :param source: the node from which the link is coming :param link_type: the link type :param link_label: the link label """ savepoint_id = None try: # Transactions are needed here for Postgresql: # https://docs.djangoproject.com/en/1.5/topics/db/transactions/#handling-exceptions-within-postgresql-transactions savepoint_id = transaction.savepoint() self.LINK_CLASS(input_id=source.id, output_id=self.id, label=link_label, type=link_type.value).save() transaction.savepoint_commit(savepoint_id) except IntegrityError as exception: transaction.savepoint_rollback(savepoint_id) raise exceptions.UniquenessError(f'failed to create the link: {exception}') from exception [docs] def clean_values(self): self._dbmodel.attributes = clean_value(self._dbmodel.attributes) self._dbmodel.extras = clean_value(self._dbmodel.extras) [docs] def store(self, links=None, with_transaction=True, clean=True): # pylint: disable=arguments-differ """Store the node in the database. :param links: optional links to add before storing :param with_transaction: if False, do not use a transaction because the caller will already have opened one. :param clean: boolean, if True, will clean the attributes and extras before attempting to store """ import contextlib from aiida.backends.djsite.db.models import suppress_auto_now if clean: self.clean_values() with transaction.atomic() if with_transaction else contextlib.nullcontext(): with suppress_auto_now([(models.DbNode, ['mtime'])]) if self.mtime else contextlib.nullcontext(): # We need to save the node model instance itself first such that it has a pk # that can be used in the foreign keys that will be needed for setting the # attributes and links self.dbmodel.save() if links: for link_triple in links: self._add_link(*link_triple) return self [docs]class DjangoNodeCollection(BackendNodeCollection): """The collection of Node entries.""" ENTITY_CLASS = DjangoNode [docs] def get(self, pk): """Return a Node entry from the collection with the given id :param pk: id of the node """ try: return self.ENTITY_CLASS.from_dbmodel(models.DbNode.objects.get(pk=pk), self.backend) except ObjectDoesNotExist: raise exceptions.NotExistent(f"Node with pk '{pk}' not found") from ObjectDoesNotExist [docs] def delete(self, pk): """Remove a Node entry from the collection with the given id :param pk: id of the node to delete """ try: models.DbNode.objects.filter(pk=pk).delete() # pylint: disable=no-member except ObjectDoesNotExist: raise exceptions.NotExistent(f"Node with pk '{pk}' not found") from ObjectDoesNotExist