343 lines
11 KiB
Python
343 lines
11 KiB
Python
from django.conf import settings
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from django.db import models
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from django.utils.timezone import now
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from jsonfield import JSONField
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from ..utils.collection import CollectionElement
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from ..utils.models import RESTModelMixin
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from ..utils.projector import ProjectorElement
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from .access_permissions import (
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ChatMessageAccessPermissions,
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ConfigAccessPermissions,
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CountdownAccessPermissions,
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ProjectorAccessPermissions,
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ProjectorMessageAccessPermissions,
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TagAccessPermissions,
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)
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from .exceptions import ProjectorException
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class ProjectorManager(models.Manager):
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"""
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Customized model manager to support our get_full_queryset method.
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"""
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def get_full_queryset(self):
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"""
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Returns the normal queryset with all projectors. In the background
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projector defaults are prefetched from the database.
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"""
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return self.get_queryset().prefetch_related(
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'projectiondefaults')
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class Projector(RESTModelMixin, models.Model):
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"""
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Model for all projectors.
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The config field contains a dictionary which uses UUIDs as keys. Every
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element must have at least the property "name". The property "stable"
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is to set whether this element should disappear on prune or clear
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requests.
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Example:
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{
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"881d875cf01741718ca926279ac9c99c": {
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"name": "topics/topic",
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"id": 1
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},
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"191c0878cdc04abfbd64f3177a21891a": {
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"name": "core/countdown",
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"stable": true,
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"status": "stop",
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"countdown_time": 20,
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"visable": true,
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"default": 42
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},
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"db670aa8d3ed4aabb348e752c75aeaaf": {
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"name": "core/clock",
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"stable": true
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}
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}
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If the config field is empty or invalid the projector shows a default
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slide.
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There are two additional fields to control the behavior of the projector
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view itself: scale and scroll.
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The projector can be controlled using the REST API with POST requests
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on e. g. the URL /rest/core/projector/1/activate_elements/.
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"""
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access_permissions = ProjectorAccessPermissions()
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objects = ProjectorManager()
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config = JSONField()
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scale = models.IntegerField(default=0)
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scroll = models.IntegerField(default=0)
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width = models.PositiveIntegerField(default=1024)
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height = models.PositiveIntegerField(default=768)
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name = models.CharField(
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max_length=255,
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unique=True,
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blank=True)
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blank = models.BooleanField(
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blank=False,
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default=False)
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class Meta:
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"""
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Contains general permissions that can not be placed in a specific app.
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"""
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default_permissions = ()
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permissions = (
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('can_see_projector', 'Can see the projector'),
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('can_manage_projector', 'Can manage the projector'),
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('can_see_frontpage', 'Can see the front page'),)
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@property
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def elements(self):
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"""
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Retrieve all projector elements given in the config field. For
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every element the method check_and_update_data() is called and its
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result is also used.
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"""
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# Get all elements from all apps.
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elements = {}
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for element in ProjectorElement.get_all():
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elements[element.name] = element
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# Parse result
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result = {}
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for key, value in self.config.items():
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# Use a copy here not to change the origin value in the config field.
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result[key] = value.copy()
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result[key]['uuid'] = key
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element = elements.get(value['name'])
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if element is None:
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result[key]['error'] = 'Projector element does not exist.'
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else:
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try:
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result[key].update(element.check_and_update_data(
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projector_object=self,
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config_entry=value))
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except ProjectorException as e:
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result[key]['error'] = str(e)
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return result
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def get_all_requirements(self):
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"""
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Generator which returns all instances that are shown on this projector.
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"""
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# Get all elements from all apps.
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elements = {}
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for element in ProjectorElement.get_all():
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elements[element.name] = element
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# Generator
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for key, value in self.config.items():
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element = elements.get(value['name'])
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if element is not None:
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yield from element.get_requirements(value)
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def get_collection_elements_required_for_this(self, collection_element):
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"""
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Returns an iterable of CollectionElements that have to be sent to this
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projector according to the given collection_element.
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"""
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from .config import config
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output = []
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changed_fields = collection_element.information.get('changed_fields', [])
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if (collection_element.collection_string == self.get_collection_string() and
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changed_fields and
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'config' not in changed_fields):
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# Projector model changed without changeing the projector config. So we just send this data.
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output.append(collection_element)
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else:
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# It is necessary to parse all active projector elements to check whether they require some data.
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this_projector = collection_element.collection_string == self.get_collection_string() and collection_element.id == self.pk
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collection_element.information['this_projector'] = this_projector
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elements = {}
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# Build projector elements.
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for element in ProjectorElement.get_all():
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elements[element.name] = element
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# Iterate over all active projector elements.
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for key, value in self.config.items():
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element = elements.get(value['name'])
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if element is not None:
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if collection_element.information.get('changed_config') == 'projector_broadcast':
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# In case of broadcast we need full update.
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output.extend(element.get_requirements_as_collection_elements(value))
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else:
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# In normal case we need all collections required by the element.
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output.extend(element.get_collection_elements_required_for_this(collection_element, value))
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# If config changed, send also this config to the projector.
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if collection_element.collection_string == config.get_collection_string():
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output.append(collection_element)
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if collection_element.information.get('changed_config') == 'projector_broadcast':
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# In case of broadcast we also need the projector himself.
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output.append(CollectionElement.from_instance(self))
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return output
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class ProjectionDefault(RESTModelMixin, models.Model):
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"""
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Model for the projection defaults like motions, agenda, list of
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speakers and thelike. The name is the technical name like 'topics' or
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'motions'. For apps the name should be the app name to get keep the
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ProjectionDefault for apps generic. But it is possible to give some
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special name like 'list_of_speakers'. The display_name is the shown
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name on the front end for the user.
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"""
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name = models.CharField(max_length=256)
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display_name = models.CharField(max_length=256)
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projector = models.ForeignKey(
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Projector,
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on_delete=models.CASCADE,
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related_name='projectiondefaults')
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def get_root_rest_element(self):
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return self.projector
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class Meta:
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default_permissions = ()
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def __str__(self):
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return self.display_name
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class Tag(RESTModelMixin, models.Model):
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"""
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Model for tags. This tags can be used for other models like agenda items,
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motions or assignments.
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"""
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access_permissions = TagAccessPermissions()
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name = models.CharField(
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max_length=255,
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unique=True)
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class Meta:
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ordering = ('name',)
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default_permissions = ()
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permissions = (
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('can_manage_tags', 'Can manage tags'),)
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def __str__(self):
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return self.name
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class ConfigStore(RESTModelMixin, models.Model):
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"""
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A model class to store all config variables in the database.
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"""
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access_permissions = ConfigAccessPermissions()
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key = models.CharField(max_length=255, unique=True, db_index=True)
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"""A string, the key of the config variable."""
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value = JSONField()
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"""The value of the config variable. """
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class Meta:
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default_permissions = ()
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permissions = (
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('can_manage_config', 'Can manage configuration'),
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('can_manage_logos', 'Can manage logos'))
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@classmethod
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def get_collection_string(cls):
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return 'core/config'
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def get_rest_pk(self):
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"""
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Returns the primary key used in the REST API.
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"""
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return self.key
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class ChatMessage(RESTModelMixin, models.Model):
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"""
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Model for chat messages.
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At the moment we only have one global chat room for managers.
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"""
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access_permissions = ChatMessageAccessPermissions()
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message = models.TextField()
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timestamp = models.DateTimeField(auto_now_add=True)
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user = models.ForeignKey(
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settings.AUTH_USER_MODEL,
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on_delete=models.CASCADE)
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class Meta:
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default_permissions = ()
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permissions = (
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('can_use_chat', 'Can use the chat'),
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('can_manage_chat', 'Can manage the chat'),)
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def __str__(self):
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return 'Message {}'.format(self.timestamp)
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class ProjectorMessage(RESTModelMixin, models.Model):
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"""
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Model for ProjectorMessages.
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"""
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access_permissions = ProjectorMessageAccessPermissions()
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message = models.TextField(blank=True)
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class Meta:
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default_permissions = ()
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class Countdown(RESTModelMixin, models.Model):
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"""
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Model for countdowns.
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"""
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access_permissions = CountdownAccessPermissions()
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description = models.CharField(max_length=256, blank=True)
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running = models.BooleanField(default=False)
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default_time = models.PositiveIntegerField(default=60)
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countdown_time = models.FloatField(default=60)
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class Meta:
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default_permissions = ()
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def control(self, action):
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if action not in ('start', 'stop', 'reset'):
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raise ValueError("Action must be 'start', 'stop' or 'reset', not {}.".format(action))
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if action == 'start':
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self.running = True
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self.countdown_time = now().timestamp() + self.default_time
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elif action == 'stop' and self.running:
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self.running = False
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self.countdown_time = self.countdown_time - now().timestamp()
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else: # reset
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self.running = False
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self.countdown_time = self.default_time
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self.save()
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