290 lines
11 KiB
Python
290 lines
11 KiB
Python
import uuid
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from datetime import datetime
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from typing import Union
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from boltons import urlutils
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from citext import CIText
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from flask import g
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from sqlalchemy import TEXT
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from sqlalchemy.dialects.postgresql import UUID
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from sqlalchemy_utils import LtreeType
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from sqlalchemy_utils.types.ltree import LQUERY
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from teal.db import CASCADE_OWN, UUIDLtree
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from teal.resource import url_for_resource
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from ereuse_devicehub.db import create_view, db, exp, f
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from ereuse_devicehub.resources.device.models import Component, Device
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from ereuse_devicehub.resources.models import Thing
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from ereuse_devicehub.resources.user.models import User
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class Lot(Thing):
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id = db.Column(UUID(as_uuid=True), primary_key=True) # uuid is generated on init by default
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name = db.Column(CIText(), nullable=False)
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description = db.Column(CIText())
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description.comment = """A comment about the lot."""
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closed = db.Column(db.Boolean, default=False, nullable=False)
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closed.comment = """
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A closed lot cannot be modified anymore.
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"""
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devices = db.relationship(Device,
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backref=db.backref('lots', lazy=True, collection_class=set),
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secondary=lambda: LotDevice.__table__,
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lazy=True,
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collection_class=set)
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"""
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The **children** devices that the lot has.
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Note that the lot can have more devices, if they are inside
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descendant lots.
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"""
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parents = db.relationship(lambda: Lot,
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viewonly=True,
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lazy=True,
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collection_class=set,
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secondary=lambda: LotParent.__table__,
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primaryjoin=lambda: Lot.id == LotParent.child_id,
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secondaryjoin=lambda: LotParent.parent_id == Lot.id,
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cascade='refresh-expire', # propagate changes outside ORM
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backref=db.backref('children',
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viewonly=True,
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lazy=True,
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cascade='refresh-expire',
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collection_class=set)
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)
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"""The parent lots."""
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all_devices = db.relationship(Device,
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viewonly=True,
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lazy=True,
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collection_class=set,
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secondary=lambda: LotDeviceDescendants.__table__,
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primaryjoin=lambda: Lot.id == LotDeviceDescendants.ancestor_lot_id,
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secondaryjoin=lambda: LotDeviceDescendants.device_id == Device.id)
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"""All devices, including components, inside this lot and its
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descendants.
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"""
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def __init__(self, name: str, closed: bool = closed.default.arg,
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description: str = None) -> None:
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"""
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Initializes a lot
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:param name:
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:param closed:
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"""
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super().__init__(id=uuid.uuid4(), name=name, closed=closed, description=description)
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Path(self) # Lots have always one edge per default.
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@property
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def type(self) -> str:
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return self.__class__.__name__
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@property
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def url(self) -> urlutils.URL:
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"""The URL where to GET this action."""
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return urlutils.URL(url_for_resource(Lot, item_id=self.id))
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@property
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def descendants(self):
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return self.descendantsq(self.id)
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@classmethod
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def descendantsq(cls, id):
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_id = UUIDLtree.convert(id)
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return (cls.id == Path.lot_id) & Path.path.lquery(exp.cast('*.{}.*'.format(_id), LQUERY))
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@classmethod
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def roots(cls):
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"""Gets the lots that are not under any other lot."""
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return cls.query.join(cls.paths).filter(db.func.nlevel(Path.path) == 1)
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def add_children(self, *children):
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"""Add children lots to this lot.
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This operation is highly costly as it forces refreshing
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many models in session.
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"""
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for child in children:
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if isinstance(child, Lot):
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Path.add(self.id, child.id)
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db.session.refresh(child)
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else:
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assert isinstance(child, uuid.UUID)
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Path.add(self.id, child)
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# We need to refresh the models involved in this operation
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# outside the session / ORM control so the models
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# that have relationships to this model
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# with the cascade 'refresh-expire' can welcome the changes
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db.session.refresh(self)
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def remove_children(self, *children):
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"""Remove children lots from this lot.
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This operation is highly costly as it forces refreshing
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many models in session.
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"""
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for child in children:
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if isinstance(child, Lot):
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Path.delete(self.id, child.id)
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db.session.refresh(child)
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else:
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assert isinstance(child, uuid.UUID)
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Path.delete(self.id, child)
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db.session.refresh(self)
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def delete(self):
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"""Deletes the lot.
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This method removes the children lots and children
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devices orphan from this lot and then marks this lot
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for deletion.
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"""
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self.remove_children(*self.children)
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db.session.delete(self)
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def _refresh_models_with_relationships_to_lots(self):
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session = db.Session.object_session(self)
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for model in session:
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if isinstance(model, (Device, Lot, Path)):
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session.expire(model)
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def __contains__(self, child: Union['Lot', Device]):
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if isinstance(child, Lot):
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return Path.has_lot(self.id, child.id)
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elif isinstance(child, Device):
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device = db.session.query(LotDeviceDescendants) \
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.filter(LotDeviceDescendants.device_id == child.id) \
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.filter(LotDeviceDescendants.ancestor_lot_id == self.id) \
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.one_or_none()
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return device
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else:
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raise TypeError('Lot only contains devices and lots, not {}'.format(child.__class__))
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def __repr__(self) -> str:
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return '<Lot {0.name} devices={0.devices!r}>'.format(self)
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class LotDevice(db.Model):
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device_id = db.Column(db.BigInteger, db.ForeignKey(Device.id), primary_key=True)
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lot_id = db.Column(UUID(as_uuid=True), db.ForeignKey(Lot.id), primary_key=True)
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created = db.Column(db.DateTime, nullable=False, default=datetime.utcnow)
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author_id = db.Column(UUID(as_uuid=True),
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db.ForeignKey(User.id),
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nullable=False,
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default=lambda: g.user.id)
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author = db.relationship(User, primaryjoin=author_id == User.id)
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author_id.comment = """
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The user that put the device in the lot.
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"""
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class Path(db.Model):
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id = db.Column(db.UUID(as_uuid=True),
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primary_key=True,
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server_default=db.text('gen_random_uuid()'))
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lot_id = db.Column(db.UUID(as_uuid=True), db.ForeignKey(Lot.id), nullable=False)
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lot = db.relationship(Lot,
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backref=db.backref('paths',
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lazy=True,
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collection_class=set,
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cascade=CASCADE_OWN),
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primaryjoin=Lot.id == lot_id)
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path = db.Column(LtreeType, nullable=False)
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created = db.Column(db.TIMESTAMP(timezone=True), server_default=db.text('CURRENT_TIMESTAMP'))
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created.comment = """
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When Devicehub created this.
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"""
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__table_args__ = (
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# dag.delete_edge needs to disable internally/temporarily the unique constraint
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db.UniqueConstraint(path, name='path_unique', deferrable=True, initially='immediate'),
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db.Index('path_gist', path, postgresql_using='gist'),
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db.Index('path_btree', path, postgresql_using='btree'),
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db.Index('lot_id_index', lot_id, postgresql_using='hash')
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)
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def __init__(self, lot: Lot) -> None:
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super().__init__(lot=lot)
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self.path = UUIDLtree(lot.id)
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@classmethod
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def add(cls, parent_id: uuid.UUID, child_id: uuid.UUID):
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"""Creates an edge between parent and child."""
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db.session.execute(db.func.add_edge(str(parent_id), str(child_id)))
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@classmethod
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def delete(cls, parent_id: uuid.UUID, child_id: uuid.UUID):
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"""Deletes the edge between parent and child."""
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db.session.execute(db.func.delete_edge(str(parent_id), str(child_id)))
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@classmethod
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def has_lot(cls, parent_id: uuid.UUID, child_id: uuid.UUID) -> bool:
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parent_id = UUIDLtree.convert(parent_id)
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child_id = UUIDLtree.convert(child_id)
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return bool(
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db.session.execute(
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"SELECT 1 from path where path ~ '*.{}.*.{}.*'".format(parent_id, child_id)
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).first()
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)
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class LotDeviceDescendants(db.Model):
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"""A view facilitating querying inclusion between devices and lots,
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including components.
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The view has 4 columns:
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1. The ID of the device.
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2. The ID of a lot containing the device.
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3. The ID of the lot that directly contains the device.
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4. If 1. is a component, the ID of the device that is inside the lot.
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"""
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_ancestor = Lot.__table__.alias(name='ancestor')
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"""Ancestor lot table."""
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_desc = Lot.__table__.alias()
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"""Descendant lot table."""
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lot_device = _desc \
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.join(LotDevice, _desc.c.id == LotDevice.lot_id) \
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.join(Path, _desc.c.id == Path.lot_id)
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"""Join: Path -- Lot -- LotDevice"""
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descendants = "path.path ~ (CAST('*.'|| replace(CAST({}.id as text), '-', '_') " \
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"|| '.*' AS LQUERY))".format(_ancestor.name)
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"""Query that gets the descendants of the ancestor lot."""
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devices = db.select([
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LotDevice.device_id,
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_desc.c.id.label('parent_lot_id'),
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_ancestor.c.id.label('ancestor_lot_id'),
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None
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]).select_from(_ancestor).select_from(lot_device).where(db.text(descendants))
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# Components
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_parent_device = Device.__table__.alias(name='parent_device')
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"""The device that has the access to the lot."""
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lot_device_component = lot_device \
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.join(_parent_device, _parent_device.c.id == LotDevice.device_id) \
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.join(Component, _parent_device.c.id == Component.parent_id)
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"""Join: Path -- Lot -- LotDevice -- ParentDevice (Device) -- Component"""
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components = db.select([
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Component.id.label('device_id'),
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_desc.c.id.label('parent_lot_id'),
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_ancestor.c.id.label('ancestor_lot_id'),
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LotDevice.device_id.label('device_parent_id'),
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]).select_from(_ancestor).select_from(lot_device_component).where(db.text(descendants))
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__table__ = create_view('lot_device_descendants', devices.union(components))
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class LotParent(db.Model):
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i = f.index(Path.path, db.func.text2ltree(f.replace(exp.cast(Path.lot_id, TEXT), '-', '_')))
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__table__ = create_view(
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'lot_parent',
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db.select([
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Path.lot_id.label('child_id'),
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exp.cast(f.replace(exp.cast(f.subltree(Path.path, i - 1, i), TEXT), '_', '-'),
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UUID).label('parent_id')
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]).select_from(Path).where(i > 0),
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)
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