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devicehub-teal/ereuse_devicehub/resources/event/views.py

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from contextlib import suppress
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from distutils.version import StrictVersion
from typing import List
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from uuid import UUID
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from flask import request
from sqlalchemy.util import OrderedSet
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from ereuse_devicehub.db import db
from ereuse_devicehub.resources.device.models import Component, Computer
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from ereuse_devicehub.resources.enums import SnapshotSoftware
from ereuse_devicehub.resources.event.models import Event, Snapshot, WorkbenchRate
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from teal.resource import View
class EventView(View):
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def one(self, id: UUID):
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"""Gets one event."""
event = Event.query.filter_by(id=id).one()
return self.schema.jsonify(event)
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SUPPORTED_WORKBENCH = StrictVersion('11.0')
class SnapshotView(View):
def post(self):
"""
Performs a Snapshot.
See `Snapshot` section in docs for more info.
"""
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s = request.get_json()
# Note that if we set the device / components into the snapshot
# model object, when we flush them to the db we will flush
# snapshot, and we want to wait to flush snapshot at the end
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device = s.pop('device') # type: Computer
components = s.pop('components') \
if s['software'] == SnapshotSoftware.Workbench else None # type: List[Component]
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snapshot = Snapshot(**s)
# Remove new events from devices so they don't interfere with sync
events_device = set(e for e in device.events_one)
device.events_one.clear()
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if components:
events_components = tuple(set(e for e in c.events_one) for c in components)
for component in components:
component.events_one.clear()
# noinspection PyArgumentList
assert not device.events_one
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assert all(not c.events_one for c in components) if components else True
db_device, remove_events = self.resource_def.sync.run(device, components)
snapshot.device = db_device
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snapshot.events |= remove_events | events_device # Set events to snapshot
# commit will change the order of the components by what
# the DB wants. Let's get a copy of the list so we preserve order
ordered_components = OrderedSet(x for x in snapshot.components)
# Add the new events to the db-existing devices and components
db_device.events_one |= events_device
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if components:
for component, events in zip(ordered_components, events_components):
component.events_one |= events
snapshot.events |= events
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# Compute ratings
with suppress(StopIteration):
# todo are we sure we want to have snapshots without rates?
snapshot.events |= next(
e.ratings() for e in events_device if isinstance(e, WorkbenchRate)
)
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db.session.add(snapshot)
db.session.commit()
# todo we are setting snapshot dirty again with this components but
# we do not want to update it.
# The real solution is https://stackoverflow.com/questions/
# 24480581/set-the-insert-order-of-a-many-to-many-sqlalchemy-
# flask-app-sqlite-db?noredirect=1&lq=1
snapshot.components = ordered_components
ret = self.schema.jsonify(snapshot) # transform it back
ret.status_code = 201
return ret