242 lines
8.1 KiB
Python
242 lines
8.1 KiB
Python
from contextlib import suppress
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from itertools import chain
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from operator import attrgetter
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from typing import Dict, Set
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from sqlalchemy import BigInteger, Column, Enum as DBEnum, Float, ForeignKey, Integer, Sequence, \
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SmallInteger, Unicode, inspect
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from sqlalchemy.ext.declarative import declared_attr
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from sqlalchemy.orm import ColumnProperty, backref, relationship
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from sqlalchemy.util import OrderedSet
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from sqlalchemy_utils import ColorType
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from ereuse_devicehub.resources.enums import ComputerMonitorTechnologies, DataStorageInterface, \
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RamFormat, RamInterface
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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
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from teal.db import CASCADE, POLYMORPHIC_ID, POLYMORPHIC_ON, ResourceNotFound, check_range
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class Device(Thing):
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"""
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Base class for any type of physical object that can be identified.
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"""
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id = Column(BigInteger, Sequence('device_seq'), primary_key=True)
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id.comment = """
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The identifier of the device for this database.
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"""
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type = Column(Unicode(STR_SM_SIZE), nullable=False)
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hid = Column(Unicode(STR_BIG_SIZE), unique=True)
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hid.comment = """
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The Hardware ID (HID) is the unique ID traceability systems
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use to ID a device globally.
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"""
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model = Column(Unicode(STR_BIG_SIZE))
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manufacturer = Column(Unicode(STR_SIZE))
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serial_number = Column(Unicode(STR_SIZE))
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weight = Column(Float(decimal_return_scale=3), check_range('weight', 0.1, 3))
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weight.comment = """
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The weight of the device in Kgm.
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"""
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width = Column(Float(decimal_return_scale=3), check_range('width', 0.1, 3))
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width.comment = """
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The width of the device in meters.
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"""
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height = Column(Float(decimal_return_scale=3), check_range('height', 0.1, 3))
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height.comment = """
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The height of the device in meters.
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"""
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depth = Column(Float(decimal_return_scale=3), check_range('depth', 0.1, 3))
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color = Column(ColorType)
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color.comment = """
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"""
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@property
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def events(self) -> list:
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"""
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All the events where the device participated, including
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1) events performed directly to the device, 2) events performed
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to a component, and 3) events performed to a parent device.
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Events are returned by ascending creation time.
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"""
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return sorted(chain(self.events_multiple, self.events_one), key=attrgetter('created'))
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def __init__(self, **kw) -> None:
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super().__init__(**kw)
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with suppress(TypeError):
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self.hid = Naming.hid(self.manufacturer, self.serial_number, self.model)
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@property
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def physical_properties(self) -> Dict[str, object or None]:
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"""
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Fields that describe the physical properties of a device.
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:return A generator where each value is a tuple with tho fields:
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- Column.
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- Actual value of the column or None.
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"""
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# todo ensure to remove materialized values when start using them
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# 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)
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and not getattr(c, 'foreign_keys', None)
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and c.key not in {'id', 'type', 'created', 'updated', 'parent_id', 'hid'}}
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@declared_attr
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def __mapper_args__(cls):
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"""
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Defines inheritance.
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From `the guide <http://docs.sqlalchemy.org/en/latest/orm/
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extensions/declarative/api.html
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#sqlalchemy.ext.declarative.declared_attr>`_
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"""
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args = {POLYMORPHIC_ID: cls.t}
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if cls.t == 'Device':
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args[POLYMORPHIC_ON] = cls.type
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return args
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def __lt__(self, other):
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return self.id < other.id
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def __repr__(self) -> str:
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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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@property
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def events(self) -> list:
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return sorted(chain(super().events, self.events_parent), key=attrgetter('created'))
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class Desktop(Computer):
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pass
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class Laptop(Computer):
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pass
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class Netbook(Computer):
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pass
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class Server(Computer):
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pass
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class Microtower(Computer):
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pass
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class ComputerMonitor(Device):
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id = Column(BigInteger, ForeignKey(Device.id), primary_key=True)
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size = Column(Float(decimal_return_scale=2), check_range('size', 2, 150))
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size.comment = """
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The size of the monitor in inches.
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"""
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technology = Column(DBEnum(ComputerMonitorTechnologies))
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technology.comment = """
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The technology the monitor uses to display the image.
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"""
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resolution_width = Column(SmallInteger, check_range('resolution_width', 10, 20000))
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resolution_width.comment = """
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The maximum horizontal resolution the monitor can natively support
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in pixels.
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"""
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resolution_height = Column(SmallInteger, check_range('resolution_height', 10, 20000))
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resolution_height.comment = """
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The maximum vertical resolution the monitor can natively support
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in pixels.
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"""
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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,
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backref=backref('components',
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lazy=True,
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cascade=CASCADE,
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order_by=lambda: Component.id,
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collection_class=OrderedSet),
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primaryjoin=parent_id == Computer.id)
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def similar_one(self, parent: Computer, blacklist: Set[int]) -> 'Component':
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"""
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Gets a component that:
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- has the same parent.
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- Doesn't generate HID.
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- Has same physical properties.
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:param parent:
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:param blacklist: A set of components to not to consider
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when looking for similar ones.
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"""
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assert self.hid is None, 'Don\'t use this method with a component that has HID'
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component = self.__class__.query \
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.filter_by(parent=parent, hid=None, **self.physical_properties) \
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.filter(~Component.id.in_(blacklist)) \
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.first()
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if not component:
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raise ResourceNotFound(self.type)
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return component
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@property
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def events(self) -> list:
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return sorted(chain(super().events, self.events_components), key=attrgetter('created'))
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class JoinedComponentTableMixin:
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@declared_attr
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def id(cls):
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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):
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size = Column(Integer, check_range('size', min=1, max=10 ** 8))
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interface = Column(DBEnum(DataStorageInterface))
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class HardDrive(DataStorage):
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pass
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class SolidStateDrive(DataStorage):
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pass
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class Motherboard(JoinedComponentTableMixin, Component):
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slots = Column(SmallInteger, check_range('slots'))
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usb = Column(SmallInteger, check_range('usb'))
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firewire = Column(SmallInteger, check_range('firewire'))
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serial = Column(SmallInteger, check_range('serial'))
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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):
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speed = Column(Float, check_range('speed', 0.1, 15))
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cores = Column(SmallInteger, check_range('cores', 1, 10))
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address = Column(SmallInteger, check_range('address', 8, 256))
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class RamModule(JoinedComponentTableMixin, Component):
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size = Column(SmallInteger, check_range('size', min=128, max=17000))
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speed = Column(Float, check_range('speed', min=100, max=10000))
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interface = Column(DBEnum(RamInterface))
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format = Column(DBEnum(RamFormat))
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