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devicehub-teal/ereuse_devicehub/resources/device/models.py

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from contextlib import suppress
from itertools import chain
from operator import attrgetter
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from typing import Dict, Set
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from sqlalchemy import BigInteger, Column, Float, ForeignKey, Integer, Sequence, SmallInteger, \
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Unicode, inspect
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from sqlalchemy.ext.declarative import declared_attr
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from sqlalchemy.orm import ColumnProperty, backref, relationship
from sqlalchemy.util import OrderedSet
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from sqlalchemy_utils import ColorType
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from ereuse_devicehub.resources.models import STR_BIG_SIZE, STR_SIZE, STR_SM_SIZE, Thing
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from ereuse_utils.naming import Naming
from teal.db import CASCADE, POLYMORPHIC_ID, POLYMORPHIC_ON, ResourceNotFound, check_range
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class Device(Thing):
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id = Column(BigInteger, Sequence('device_seq'), primary_key=True)
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type = Column(Unicode(STR_SM_SIZE), nullable=False)
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hid = Column(Unicode(STR_BIG_SIZE), unique=True)
model = Column(Unicode(STR_BIG_SIZE))
manufacturer = Column(Unicode(STR_SIZE))
serial_number = Column(Unicode(STR_SIZE))
weight = Column(Float(decimal_return_scale=3), check_range('weight', 0.1, 3))
width = Column(Float(decimal_return_scale=3), check_range('width', 0.1, 3))
height = Column(Float(decimal_return_scale=3), check_range('height', 0.1, 3))
depth = Column(Float(decimal_return_scale=3), check_range('depth', 0.1, 3))
color = Column(ColorType)
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@property
def events(self) -> list:
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"""
All the events performed to the device,
ordered by ascending creation time.
"""
return sorted(chain(self.events_multiple, self.events_one), key=attrgetter('created'))
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def __init__(self, *args, **kw) -> None:
super().__init__(*args, **kw)
with suppress(TypeError):
self.hid = Naming.hid(self.manufacturer, self.serial_number, self.model) # type: str
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@property
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def physical_properties(self) -> Dict[str, object or None]:
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"""
Fields that describe the physical properties of a device.
:return A generator where each value is a tuple with tho fields:
- Column.
- Actual value of the column or None.
"""
# todo ensure to remove materialized values when start using them
# todo or self.__table__.columns if inspect fails
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return {c.key: getattr(self, c.key, None)
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for c in inspect(self.__class__).attrs
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if isinstance(c, ColumnProperty)
and not getattr(c, 'foreign_keys', None)
and c.key not in {'id', 'type', 'created', 'updated', 'parent_id', 'hid'}}
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@declared_attr
def __mapper_args__(cls):
"""
Defines inheritance.
From `the guide <http://docs.sqlalchemy.org/en/latest/orm/
extensions/declarative/api.html
#sqlalchemy.ext.declarative.declared_attr>`_
"""
args = {POLYMORPHIC_ID: cls.t}
if cls.t == 'Device':
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args[POLYMORPHIC_ON] = cls.type
return args
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def __lt__(self, other):
return self.id < other.id
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def __repr__(self) -> str:
return '<{0.t} {0.id!r} model={0.model!r} S/N={0.serial_number!r}>'.format(self)
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class Computer(Device):
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id = Column(BigInteger, ForeignKey(Device.id), primary_key=True)
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class Desktop(Computer):
pass
class Laptop(Computer):
pass
class Netbook(Computer):
pass
class Server(Computer):
pass
class Microtower(Computer):
pass
class Component(Device):
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id = Column(BigInteger, ForeignKey(Device.id), primary_key=True)
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parent_id = Column(BigInteger, ForeignKey(Computer.id))
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parent = relationship(Computer,
backref=backref('components',
lazy=True,
cascade=CASCADE,
order_by=lambda: Component.id,
collection_class=OrderedSet),
primaryjoin=parent_id == Computer.id) # type: Device
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def similar_one(self, parent: Computer, blacklist: Set[int]) -> 'Component':
"""
Gets a component that:
- has the same parent.
- Doesn't generate HID.
- Has same physical properties.
:param parent:
:param blacklist: A set of components to not to consider
when looking for similar ones.
"""
assert self.hid is None, 'Don\'t use this method with a component that has HID'
component = self.__class__.query \
.filter_by(parent=parent, hid=None, **self.physical_properties) \
.filter(~Component.id.in_(blacklist)) \
.first()
if not component:
raise ResourceNotFound(self.type)
return component
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@property
def events(self) -> list:
return sorted(chain(super().events, self.events_components), key=attrgetter('id'))
class JoinedComponentTableMixin:
@declared_attr
def id(cls):
return Column(BigInteger, ForeignKey(Component.id), primary_key=True)
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class GraphicCard(JoinedComponentTableMixin, Component):
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memory = Column(SmallInteger, check_range('memory', min=1, max=10000))
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class DataStorage(JoinedComponentTableMixin, Component):
size = Column(Integer, check_range('size', min=1, max=10 ** 8))
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class HardDrive(DataStorage):
pass
class SolidStateDrive(DataStorage):
pass
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class Motherboard(JoinedComponentTableMixin, Component):
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slots = Column(SmallInteger, check_range('slots'))
usb = Column(SmallInteger, check_range('usb'))
firewire = Column(SmallInteger, check_range('firewire'))
serial = Column(SmallInteger, check_range('serial'))
pcmcia = Column(SmallInteger, check_range('pcmcia'))
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class NetworkAdapter(JoinedComponentTableMixin, Component):
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speed = Column(SmallInteger, check_range('speed', min=10, max=10000))
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class Processor(JoinedComponentTableMixin, Component):
speed = Column(Float, check_range('speed', 0.1, 15))
cores = Column(SmallInteger, check_range('cores', 1, 10))
address = Column(SmallInteger, check_range('address', 8, 256))
class RamModule(JoinedComponentTableMixin, Component):
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size = Column(SmallInteger, check_range('size', min=128, max=17000))
speed = Column(Float, check_range('speed', min=100, max=10000))