365 lines
15 KiB
Python
365 lines
15 KiB
Python
import copy
|
||
import difflib
|
||
from contextlib import suppress
|
||
from itertools import groupby
|
||
from typing import Iterable, Set
|
||
|
||
import yaml
|
||
from flask import g
|
||
from sqlalchemy import inspect
|
||
from sqlalchemy.exc import IntegrityError
|
||
from sqlalchemy.util import OrderedSet
|
||
from teal.db import ResourceNotFound
|
||
from teal.marshmallow import ValidationError
|
||
|
||
from ereuse_devicehub.db import db
|
||
from ereuse_devicehub.resources.action.models import Remove
|
||
from ereuse_devicehub.resources.device.models import (
|
||
Component,
|
||
Computer,
|
||
DataStorage,
|
||
Device,
|
||
Placeholder,
|
||
)
|
||
from ereuse_devicehub.resources.tag.model import Tag
|
||
|
||
DEVICES_ALLOW_DUPLICITY = [
|
||
'RamModule',
|
||
'Display',
|
||
'SoundCard',
|
||
'Battery',
|
||
'Camera',
|
||
'GraphicCard',
|
||
]
|
||
|
||
|
||
class Sync:
|
||
"""Synchronizes the device and components with the database."""
|
||
|
||
def run(
|
||
self, device: Device, components: Iterable[Component] or None
|
||
) -> (Device, OrderedSet):
|
||
"""Synchronizes the device and components with the database.
|
||
|
||
Identifies if the device and components exist in the database
|
||
and updates / inserts them as necessary.
|
||
|
||
Passed-in parameters have to be transient, or said differently,
|
||
not-db-synced objects, or otherwise they would end-up being
|
||
added in the session. `Learn more... <http://docs.sqlalchemy.org/
|
||
en/latest/orm/session_state_management.html#quickie-intro-to
|
||
-object-states>`_.
|
||
|
||
This performs Add / Remove as necessary.
|
||
|
||
:param device: The device to add / update to the database.
|
||
:param components: Components that are inside of the device.
|
||
This method performs Add and Remove actions
|
||
so the device ends up with these components.
|
||
Components are added / updated accordingly.
|
||
If this is empty, all components are removed.
|
||
If this is None, it means that we are not
|
||
providing info about the components, in which
|
||
case we keep the already existing components
|
||
of the device –we don't touch them.
|
||
:return: A tuple of:
|
||
|
||
1. The device from the database (with an ID) whose
|
||
``components`` field contain the db version
|
||
of the passed-in components.
|
||
2. A list of Add / Remove (not yet added to session).
|
||
"""
|
||
db_device = self.execute_register(device)
|
||
db_components, actions = OrderedSet(), OrderedSet()
|
||
if components is not None: # We have component info (see above)
|
||
if not isinstance(db_device, Computer):
|
||
# Until a good reason is given, we synthetically forbid
|
||
# non-computers with components
|
||
raise ValidationError('Only computers can have components.')
|
||
blacklist = set() # type: Set[int]
|
||
not_new_components = set()
|
||
for component in components:
|
||
db_component, is_new = self.execute_register_component(
|
||
component, blacklist, parent=db_device
|
||
)
|
||
db_components.add(db_component)
|
||
if not is_new:
|
||
not_new_components.add(db_component)
|
||
# We only want to perform Add/Remove to not new components
|
||
actions = self.add_remove(db_device, not_new_components)
|
||
db_device.components = db_components
|
||
return db_device, actions
|
||
|
||
def execute_register_component(
|
||
self, component: Component, blacklist: Set[int], parent: Computer
|
||
):
|
||
"""Synchronizes one component to the DB.
|
||
|
||
This method is a specialization of :meth:`.execute_register`
|
||
but for components that are inside parents.
|
||
|
||
This method assumes components don't have tags, and it tries
|
||
to identify a non-hid component by finding a
|
||
:meth:`ereuse_devicehub.resources.device.models.Component.
|
||
similar_one`.
|
||
|
||
:param component: The component to sync.
|
||
:param blacklist: A set of components already found by
|
||
Component.similar_one(). Pass-in an empty Set.
|
||
:param parent: For components, the computer that contains them.
|
||
Helper used by Component.similar_one().
|
||
:return: A tuple with:
|
||
- The synced component. See :meth:`.execute_register`
|
||
for more info.
|
||
- A flag stating if the device is new or it already
|
||
existed in the DB.
|
||
"""
|
||
assert inspect(component).transient, 'Component should not be synced from DB'
|
||
# if not is a DataStorage, then need build a new one
|
||
if component.t in DEVICES_ALLOW_DUPLICITY:
|
||
db.session.add(component)
|
||
is_new = True
|
||
return component, is_new
|
||
|
||
# if not, then continue with the traditional behaviour
|
||
try:
|
||
if component.hid:
|
||
db_component = Device.query.filter_by(
|
||
hid=component.hid, owner_id=g.user.id
|
||
).one()
|
||
assert isinstance(
|
||
db_component, Device
|
||
), '{} must be a component'.format(db_component)
|
||
else:
|
||
# Is there a component similar to ours?
|
||
db_component = component.similar_one(parent, blacklist)
|
||
# We blacklist this component so we
|
||
# ensure we don't get it again for another component
|
||
# with the same physical properties
|
||
blacklist.add(db_component.id)
|
||
except ResourceNotFound:
|
||
db.session.add(component)
|
||
# db.session.flush()
|
||
db_component = component
|
||
is_new = True
|
||
else:
|
||
self.merge(component, db_component)
|
||
is_new = False
|
||
return db_component, is_new
|
||
|
||
def execute_register(self, device: Device) -> Device:
|
||
"""Synchronizes one device to the DB.
|
||
|
||
This method tries to get an existing device using the HID
|
||
or one of the tags, and...
|
||
|
||
- if it already exists it returns a "local synced version"
|
||
–the same ``device`` you passed-in but with updated values
|
||
from the database. In this case we do not
|
||
"touch" any of its values on the DB.
|
||
- If it did not exist, a new device is created in the db.
|
||
|
||
This method validates that all passed-in tags (``device.tags``),
|
||
if linked, are linked to the same device, ditto for the hid.
|
||
Finally it links the tags with the device.
|
||
|
||
If you pass-in a component that is inside a parent, use
|
||
:meth:`.execute_register_component` as it has more specialized
|
||
methods to handle them.
|
||
|
||
:param device: The device to synchronize to the DB.
|
||
:raise NeedsId: The device has not any identifier we can use.
|
||
To still create the device use
|
||
``force_creation``.
|
||
:raise DatabaseError: Any other error from the DB.
|
||
:return: The synced device from the db with the tags linked.
|
||
"""
|
||
assert inspect(device).transient, 'Device cannot be already synced from DB'
|
||
assert all(
|
||
inspect(tag).transient for tag in device.tags
|
||
), 'Tags cannot be synced from DB'
|
||
db_device = None
|
||
if isinstance(device, Computer):
|
||
# first search by uuid
|
||
if device.system_uuid:
|
||
with suppress(ResourceNotFound):
|
||
db_device = Computer.query.filter_by(
|
||
system_uuid=device.system_uuid, owner_id=g.user.id, active=True
|
||
).one()
|
||
# if no there are any Computer by uuid search by hid
|
||
if not db_device and device.hid:
|
||
with suppress(ResourceNotFound):
|
||
db_device = Device.query.filter_by(
|
||
hid=device.hid, owner_id=g.user.id, active=True
|
||
).one()
|
||
elif device.hid:
|
||
with suppress(ResourceNotFound):
|
||
db_device = Device.query.filter_by(
|
||
hid=device.hid, owner_id=g.user.id, active=True
|
||
).one()
|
||
|
||
if db_device and db_device.allocated:
|
||
raise ResourceNotFound('device is actually allocated {}'.format(device))
|
||
|
||
try:
|
||
tags = {
|
||
Tag.from_an_id(tag.id).one() for tag in device.tags
|
||
} # type: Set[Tag]
|
||
except ResourceNotFound:
|
||
raise ResourceNotFound('tag you are linking to device {}'.format(device))
|
||
linked_tags = {tag for tag in tags if tag.device_id} # type: Set[Tag]
|
||
if linked_tags:
|
||
sample_tag = next(iter(linked_tags))
|
||
for tag in linked_tags:
|
||
if tag.device_id != sample_tag.device_id:
|
||
raise MismatchBetweenTags(
|
||
tag, sample_tag
|
||
) # Tags linked to different devices
|
||
if db_device: # Device from hid
|
||
if (
|
||
sample_tag.device_id != db_device.id
|
||
): # Device from hid != device from tags
|
||
raise MismatchBetweenTagsAndHid(db_device.id, db_device.hid)
|
||
else: # There was no device from hid
|
||
if sample_tag.device.physical_properties != device.physical_properties:
|
||
# Incoming physical props of device != props from tag's device
|
||
# which means that the devices are not the same
|
||
raise MismatchBetweenProperties(
|
||
sample_tag.device.physical_properties,
|
||
device.physical_properties,
|
||
)
|
||
db_device = sample_tag.device
|
||
|
||
if db_device: # Device from hid or tags
|
||
self.merge(device, db_device)
|
||
else: # Device is new and tags are not linked to a device
|
||
device.tags.clear() # We don't want to add the transient dummy tags
|
||
db.session.add(device)
|
||
self.create_placeholder(device)
|
||
db_device = device
|
||
db_device.tags |= (
|
||
tags # Union of tags the device had plus the (potentially) new ones
|
||
)
|
||
try:
|
||
db.session.flush()
|
||
except IntegrityError as e:
|
||
# Manage 'one tag per organization' unique constraint
|
||
if 'One tag per organization' in e.args[0]:
|
||
# todo test for this
|
||
id = int(e.args[0][135 : e.args[0].index(',', 135)])
|
||
raise ValidationError(
|
||
'The device is already linked to tag {} '
|
||
'from the same organization.'.format(id),
|
||
field_names=['device.tags'],
|
||
)
|
||
else:
|
||
raise
|
||
assert db_device is not None
|
||
return db_device
|
||
|
||
@staticmethod
|
||
def merge(device: Device, db_device: Device):
|
||
"""Copies the physical properties of the device to the db_device.
|
||
|
||
This method mutates db_device.
|
||
"""
|
||
if db_device.owner_id != g.user.id:
|
||
return
|
||
|
||
if device.placeholder and not db_device.placeholder:
|
||
return
|
||
|
||
for field_name, value in device.physical_properties.items():
|
||
if value is not None:
|
||
setattr(db_device, field_name, value)
|
||
|
||
# if device.system_uuid and db_device.system_uuid and device.system_uuid != db_device.system_uuid:
|
||
# TODO @cayop send error to sentry.io
|
||
# there are 2 computers duplicate get db_device for hid
|
||
|
||
if hasattr(device, 'system_uuid') and device.system_uuid:
|
||
db_device.system_uuid = device.system_uuid
|
||
|
||
@staticmethod
|
||
def create_placeholder(device: Device):
|
||
"""If the device is new, we need create automaticaly a new placeholder"""
|
||
# import pdb; pdb.set_trace()
|
||
dict_device = copy.copy(device.__dict__)
|
||
dict_device.pop('_sa_instance_state')
|
||
dev_placeholder = device.__class__(**dict_device)
|
||
for c in device.components:
|
||
c_dict = copy.copy(c.__dict__)
|
||
c_dict.pop('_sa_instance_state')
|
||
c_placeholder = c.__class__(**c_dict)
|
||
c_placeholder.parent = dev_placeholder
|
||
component_placeholder = Placeholder(device=c_placeholder, binding=c)
|
||
db.session.add(c_placeholder)
|
||
db.session.add(component_placeholder)
|
||
|
||
placeholder = Placeholder(device=dev_placeholder, binding=device)
|
||
db.session.add(dev_placeholder)
|
||
db.session.add(placeholder)
|
||
|
||
@staticmethod
|
||
def add_remove(device: Computer, components: Set[Component]) -> OrderedSet:
|
||
"""Generates the Add and Remove actions (but doesn't add them to
|
||
session).
|
||
|
||
:param device: A device which ``components`` attribute contains
|
||
the old list of components. The components that
|
||
are not in ``components`` will be Removed.
|
||
:param components: List of components that are potentially to
|
||
be Added. Some of them can already exist
|
||
on the device, in which case they won't
|
||
be re-added.
|
||
:return: A list of Add / Remove actions.
|
||
"""
|
||
# Note that we create the Remove actions before the Add ones
|
||
actions = OrderedSet()
|
||
old_components = set(device.components)
|
||
|
||
adding = components - old_components
|
||
if adding:
|
||
# For the components we are adding, let's remove them from their old parents
|
||
def g_parent(component: Component) -> Device:
|
||
return component.parent or Device(
|
||
id=0
|
||
) # Computer with id 0 is our Identity
|
||
|
||
for parent, _components in groupby(
|
||
sorted(adding, key=g_parent), key=g_parent
|
||
):
|
||
set_components = OrderedSet(_components)
|
||
check_owners = (x.owner_id == g.user.id for x in set_components)
|
||
# Is not Computer Identity and all components have the correct owner
|
||
if parent.id != 0 and all(check_owners):
|
||
actions.add(Remove(device=parent, components=set_components))
|
||
return actions
|
||
|
||
|
||
class MismatchBetweenTags(ValidationError):
|
||
def __init__(self, tag: Tag, other_tag: Tag, field_names={'device.tags'}):
|
||
message = '{!r} and {!r} are linked to different devices.'.format(
|
||
tag, other_tag
|
||
)
|
||
super().__init__(message, field_names)
|
||
|
||
|
||
class MismatchBetweenTagsAndHid(ValidationError):
|
||
def __init__(self, device_id: int, hid: str, field_names={'device.hid'}):
|
||
message = 'Tags are linked to device {} but hid refers to device {}.'.format(
|
||
device_id, hid
|
||
)
|
||
super().__init__(message, field_names)
|
||
|
||
|
||
class MismatchBetweenProperties(ValidationError):
|
||
def __init__(self, props1, props2, field_names={'device'}):
|
||
message = 'The device from the tag and the passed-in differ the following way:'
|
||
message += '\n'.join(
|
||
difflib.ndiff(
|
||
yaml.dump(props1).splitlines(), yaml.dump(props2).splitlines()
|
||
)
|
||
)
|
||
super().__init__(message, field_names)
|