Update to channels 2

* geis does not work with channels2 and never will be (it has to be python now)
* pytest
* rewrote cache system
* use username instead of pk for admin user in tests

.gitignore

@@ -30,6 +30,7 @@ debug/*
 # Unit test and coverage reports
 .coverage
 tests/file/*
+.pytest_cache
 
 # Plugin development
 openslides_*

.travis.yml

@@ -22,15 +22,9 @@ install:
   - node_modules/.bin/gulp --production
 script:
   - flake8 openslides tests
-  - isort --check-only --recursive openslides tests
+  - isort --check-only --diff --recursive openslides tests
   - python -m mypy openslides/
   - node_modules/.bin/gulp jshint
   - node_modules/.bin/karma start --browsers PhantomJS tests/karma/karma.conf.js
 
-  - DJANGO_SETTINGS_MODULE='tests.settings' coverage run ./manage.py test tests.unit
+  - pytest --cov --cov-fail-under=70
-  - coverage report --fail-under=35
-
-  - DJANGO_SETTINGS_MODULE='tests.settings' coverage run ./manage.py test tests.integration
-  - coverage report --fail-under=73
-
-  - DJANGO_SETTINGS_MODULE='tests.settings' ./manage.py test tests.old

DEVELOPMENT.rst

@@ -78,7 +78,7 @@ To get help on the command line options run::
 
 Later you might want to restart the server with one of the following commands.
 
-To start OpenSlides with Daphne and one worker and to avoid opening new browser
+To start OpenSlides with Daphne and to avoid opening new browser
 windows run::
 
     $ python manage.py start --no-browser
@@ -87,16 +87,10 @@ When debugging something email related change the email backend to console::
 
     $ python manage.py start --debug-email
 
-To start OpenSlides with Daphne and four workers (avoid concurrent write
+To start OpenSlides with Daphne run::
-requests or use PostgreSQL, see below) run::
 
     $ python manage.py runserver
 
-To start OpenSlides with Geiss and one worker and to avoid opening new browser
-windows (download Geiss and setup Redis before, see below) run::
-
-    $ python manage.py start --no-browser --use-geiss
-
 Use gulp watch in a second command-line interface::
 
     $ node_modules/.bin/gulp watch
@@ -152,8 +146,7 @@ OpenSlides in big mode
 
 In the so called big mode you should use OpenSlides with Redis, PostgreSQL and a
 webserver like Apache HTTP Server or nginx as proxy server in front of your
-OpenSlides interface server. Optionally you can use `Geiss
+OpenSlides interface server.
-<https://github.com/ostcar/geiss/>`_ as interface server instead of Daphne.
 
 
 1. Install and configure PostgreSQL and Redis
@@ -200,23 +193,12 @@ Populate your new database::
 4. Run OpenSlides
 -----------------
 
-First start e. g. four workers (do not use the `--threads` option, because the threads will not spawn across all cores)::
-
-    $ python manage.py runworker&
-    $ python manage.py runworker&
-    $ python manage.py runworker&
-    $ python manage.py runworker&
-
 To start Daphne as protocol server run::
 
     $ export DJANGO_SETTINGS_MODULE=settings
     $ export PYTHONPATH=personal_data/var/
     $ daphne openslides.asgi:channel_layer
 
-To use Geiss instead of Daphne, just download Geiss and start it::
-
-    $ python manage.py getgeiss
-    $ ./personal_data/var/geiss
 
 5. Use Nginx (optional)
 
@@ -224,7 +206,7 @@ When using Nginx as a proxy for delivering staticfiles the performance of the se
 
     $ python manage.py collectstatic
 
-This is an example configuration for a single Daphne/Geiss listen on port 8000::
+This is an example configuration for a single Daphne listen on port 8000::
 
     server {
          listen 80;
@@ -259,7 +241,7 @@ This is an example configuration for a single Daphne/Geiss listen on port 8000::
          }
      }
 
-Using Nginx as a load balancer is fairly easy. Just start multiple Daphnes/Geiss on different ports, change the `proxy_pass` to `http://openslides/` and add this on top of the Nginx configuration::
+Using Nginx as a load balancer is fairly easy. Just start multiple Daphnes on different ports, change the `proxy_pass` to `http://openslides/` and add this on top of the Nginx configuration::
 
     upstream openslides {
         server localhost:2001;

README.rst

@@ -148,13 +148,12 @@ You should use a webserver like Apache HTTP Server or nginx to serve the
 static and media files as proxy server in front of your OpenSlides
 interface server. You also should use a database like PostgreSQL and Redis
 as channels backend, cache backend and session engine. Finally you should
-start some WSGI workers and one or more interface servers (Daphne or Geiss).
+start one or more interface servers (Daphne).
 
 Please see the respective section in the `DEVELOPMENT.rst
 <https://github.com/OpenSlides/OpenSlides/blob/master/DEVELOPMENT.rst>`_ and:
 
 * https://channels.readthedocs.io/en/latest/deploying.html
-* https://github.com/ostcar/geiss
 * https://docs.djangoproject.com/en/1.10/topics/cache/
 * https://github.com/sebleier/django-redis-cache
 * https://docs.djangoproject.com/en/1.10/ref/settings/#databases

make/commands.py

@@ -1,42 +1,10 @@
-import re
-
 from parser import command, argument, call
+import yaml
+import requirements
 
 FAIL = '\033[91m'
 SUCCESS = '\033[92m'
-RESET   = '\033[0m'
+RESET = '\033[0m'
-
-
-@argument('module', nargs='?', default='')
-@command('test', help='runs the tests')
-def test(args=None):
-    """
-    Runs the tests.
-    """
-    module = getattr(args, 'module', '')
-    if module == '':
-        module = 'tests'
-    else:
-        module = 'tests.{}'.format(module)
-    return call("DJANGO_SETTINGS_MODULE='tests.settings' coverage run "
-                "./manage.py test {}".format(module))
-
-
-@argument('--plain', action='store_true')
-@command('coverage', help='Runs all tests and builds the coverage html files')
-def coverage(args=None, plain=None):
-    """
-    Runs the tests and creates a coverage report.
-
-    By default it creates a html report. With the argument --plain, it creates
-    a plain report and fails under a certain amount of untested lines.
-    """
-    if plain is None:
-        plain = getattr(args, 'plain', False)
-    if plain:
-        return call('coverage report -m --fail-under=80')
-    else:
-        return call('coverage html')
 
 
 @command('check', help='Checks for pep8 errors in openslides and tests')
@@ -54,17 +22,10 @@ def travis(args=None):
     """
     return_codes = []
     with open('.travis.yml') as f:
-        script_lines = False
+        travis = yaml.load(f)
-        for line in (line.strip() for line in f.readlines()):
+        for line in travis['script']:
-            if line == 'script:':
+            print('Run: {}'.format(line))
-                script_lines = True
+            return_code = call(line)
-                continue
-            if not script_lines or not line:
-                continue
-
-            match = re.search(r'"(.*)"', line)
-            print('Run: %s' % match.group(1))
-            return_code = call(match.group(1))
             return_codes.append(return_code)
             if return_code:
                 print(FAIL + 'fail!\n' + RESET)
@@ -76,7 +37,7 @@ def travis(args=None):
 
 
 @argument('-r', '--requirements', nargs='?',
-          default='requirements_production.txt')
+          default='requirements.txt')
 @command('min_requirements',
          help='Prints a pip line to install the minimum supported versions of '
               'the requirements.')
@@ -85,23 +46,19 @@ def min_requirements(args=None):
     Prints a pip install command to install the minimal supported versions of a
     requirement file.
 
-    Uses requirements_production.txt by default.
+    Uses requirements.txt by default.
 
     The following line will install the version:
 
     pip install $(python make min_requirements)
     """
-    import pip
-
     def get_lowest_versions(requirements_file):
-        for line in pip.req.parse_requirements(requirements_file, session=pip.download.PipSession()):
+        with open(requirements_file) as f:
-            for specifier in line.req.specifier:
+            for req in requirements.parse(f):
-                if specifier.operator == '>=':
+                if req.specifier:
-                    min_version = specifier.version
+                    for spec, version in req.specs:
-                    break
+                        if spec == ">=":
-            else:
+                            yield "{}=={}".format(req.name, version)
-                raise ValueError('Not supported line {}'.format(line))
-            yield '%s==%s' % (line.req.name, min_version)
 
     print(' '.join(get_lowest_versions(args.requirements)))
 

make/requirements.txt

@@ -0,0 +1,4 @@
+# Requirements for the make scripts
+
+requirements-parser
+PyYAML

openslides/__main__.py

@@ -1,7 +1,6 @@
 #!/usr/bin/env python
 
 import os
-import subprocess
 import sys
 from typing import Dict  # noqa
 
@@ -14,7 +13,6 @@ from openslides.utils.main import (
     ExceptionArgumentParser,
     UnknownCommand,
     get_default_settings_dir,
-    get_geiss_path,
     get_local_settings_dir,
     is_local_installation,
     open_browser,
@@ -145,10 +143,6 @@ def get_parser():
         '--local-installation',
         action='store_true',
         help='Store settings and user files in a local directory.')
-    subcommand_start.add_argument(
-        '--use-geiss',
-        action='store_true',
-        help='Use Geiss instead of Daphne as ASGI protocol server.')
 
     # Subcommand createsettings
     createsettings_help = 'Creates the settings file.'
@@ -220,56 +214,23 @@ def start(args):
     # Migrate database
     call_command('migrate')
 
-    if args.use_geiss:
+    # Open the browser
-        # Make sure Redis is used.
+    if not args.no_browser:
-        if settings.CHANNEL_LAYERS['default']['BACKEND'] != 'asgi_redis.RedisChannelLayer':
+        open_browser(args.host, args.port)
-            raise RuntimeError("You have to use the ASGI Redis backend in the settings to use Geiss.")
 
-        # Download Geiss and collect the static files.
+    # Start Daphne
-        call_command('getgeiss')
+    #
-        call_command('collectstatic', interactive=False)
+    # Use flag --noreload to tell Django not to reload the server.
-
+    # Therefor we have to set the keyword noreload to False because Django
-        # Open the browser
+    # parses this directly to the use_reloader keyword.
-        if not args.no_browser:
+    #
-            open_browser(args.host, args.port)
+    # Use flag --insecure to serve static files even if DEBUG is False.
-
+    call_command(
-        # Start Geiss in its own thread
+        'runserver',
-        subprocess.Popen([
+        '{}:{}'.format(args.host, args.port),
-            get_geiss_path(),
+        noreload=False,  # Means True, see above.
-            '--host', args.host,
+        insecure=True,
-            '--port', args.port,
+    )
-            '--static', '/static/:{}'.format(settings.STATIC_ROOT),
-            '--static', '/media/:{}'.format(settings.MEDIA_ROOT),
-        ])
-
-        # Start one worker in this thread. There can be only one worker as
-        # long as SQLite3 is used.
-        call_command('runworker')
-
-    else:
-        # Open the browser
-        if not args.no_browser:
-            open_browser(args.host, args.port)
-
-        # Start Daphne and one worker
-        #
-        # Use flag --noreload to tell Django not to reload the server.
-        # Therefor we have to set the keyword noreload to False because Django
-        # parses this directly to the use_reloader keyword.
-        #
-        # Use flag --insecure to serve static files even if DEBUG is False.
-        #
-        # Use flag --nothreading to tell Django Channels to run in single
-        # thread mode with one worker only. Therefor we have to set the keyword
-        # nothreading to False because Django parses this directly to
-        # use_threading keyword.
-        call_command(
-            'runserver',
-            '{}:{}'.format(args.host, args.port),
-            noreload=False,  # Means True, see above.
-            insecure=True,
-            nothreading=False,  # Means True, see above.
-        )
 
 
 def createsettings(args):

openslides/agenda/apps.py

@@ -1,6 +1,5 @@
 from django.apps import AppConfig
 
-from ..utils.collection import Collection
 from ..utils.projector import register_projector_elements
 
 
@@ -48,7 +47,7 @@ class AgendaAppConfig(AppConfig):
 
     def get_startup_elements(self):
         """
-        Yields all collections required on startup i. e. opening the websocket
+        Yields all Cachables required on startup i. e. opening the websocket
         connection.
         """
-        yield Collection(self.get_model('Item').get_collection_string())
+        yield self.get_model('Item')

openslides/agenda/migrations/0003_auto_20170818_1202.py

@@ -4,8 +4,9 @@ from __future__ import unicode_literals
 
 from django.db import migrations
 
-from openslides.utils.migrations import \
+from openslides.utils.migrations import (
-    add_permission_to_groups_based_on_existing_permission
+    add_permission_to_groups_based_on_existing_permission,
+)
 
 
 class Migration(migrations.Migration):

openslides/agenda/migrations/0005_auto_20180815_1109.py

@@ -5,8 +5,9 @@ from __future__ import unicode_literals
 from django.contrib.auth.models import Permission
 from django.db import migrations, models
 
-from openslides.utils.migrations import \
+from openslides.utils.migrations import (
-    add_permission_to_groups_based_on_existing_permission
+    add_permission_to_groups_based_on_existing_permission,
+)
 
 
 def delete_old_can_see_hidden_permission(apps, schema_editor):

openslides/agenda/models.py

@@ -7,8 +7,7 @@ from django.contrib.contenttypes.fields import GenericForeignKey
 from django.contrib.contenttypes.models import ContentType
 from django.db import models, transaction
 from django.utils import timezone
-from django.utils.translation import ugettext as _
+from django.utils.translation import ugettext as _, ugettext_lazy
-from django.utils.translation import ugettext_lazy
 
 from openslides.core.config import config
 from openslides.core.models import Countdown, Projector

openslides/agenda/urls.py

@@ -2,6 +2,7 @@ from django.conf.urls import url
 
 from . import views
 
+
 urlpatterns = [
     url(r'^docxtemplate/$',
         views.AgendaDocxTemplateView.as_view(),

openslides/asgi.py

@@ -1,12 +1,16 @@
-from channels.asgi import get_channel_layer
+"""
+ASGI entrypoint. Configures Django and then runs the application
+defined in the ASGI_APPLICATION setting.
+"""
+
+import django
+from channels.routing import get_default_application
 
 from .utils.main import setup_django_settings_module
 
+
 # Loads the openslides setting. You can use your own settings by setting the
 # environment variable DJANGO_SETTINGS_MODULE
 setup_django_settings_module()
-
+django.setup()
-channel_layer = get_channel_layer()
+application = get_default_application()
-
-# Use native twisted mode
-channel_layer.extensions.append("twisted")

openslides/assignments/apps.py

@@ -3,7 +3,6 @@ from typing import Dict, List, Union  # noqa
 from django.apps import AppConfig
 from mypy_extensions import TypedDict
 
-from ..utils.collection import Collection
 from ..utils.projector import register_projector_elements
 
 
@@ -41,10 +40,10 @@ class AssignmentsAppConfig(AppConfig):
 
     def get_startup_elements(self):
         """
-        Yields all collections required on startup i. e. opening the websocket
+        Yields all Cachables required on startup i. e. opening the websocket
         connection.
         """
-        yield Collection(self.get_model('Assignment').get_collection_string())
+        yield self.get_model('Assignment')
 
     def get_angular_constants(self):
         assignment = self.get_model('Assignment')

openslides/assignments/models.py

@@ -4,8 +4,7 @@ from typing import Any, Dict, List, Optional  # noqa
 from django.conf import settings
 from django.contrib.contenttypes.fields import GenericRelation
 from django.db import models
-from django.utils.translation import ugettext as _
+from django.utils.translation import ugettext as _, ugettext_noop
-from django.utils.translation import ugettext_noop
 
 from openslides.agenda.models import Item, Speaker
 from openslides.core.config import config

openslides/core/apps.py

@@ -6,7 +6,6 @@ from django.apps import AppConfig
 from django.conf import settings
 from django.db.models.signals import post_migrate
 
-from ..utils.collection import Collection
 from ..utils.projector import register_projector_elements
 
 
@@ -66,11 +65,11 @@ class CoreAppConfig(AppConfig):
 
     def get_startup_elements(self):
         """
-        Yields all collections required on startup i. e. opening the websocket
+        Yields all Cachables required on startup i. e. opening the websocket
         connection.
         """
-        for model in ('Projector', 'ChatMessage', 'Tag', 'ProjectorMessage', 'Countdown', 'ConfigStore'):
+        for model_name in ('Projector', 'ChatMessage', 'Tag', 'ProjectorMessage', 'Countdown', 'ConfigStore'):
-            yield Collection(self.get_model(model).get_collection_string())
+            yield self.get_model(model_name)
 
     def get_angular_constants(self):
         from .config import config

openslides/core/config.py

@@ -1,13 +1,25 @@
-from typing import Any, Callable, Dict, Iterable, Optional, TypeVar, Union
+from typing import (
+    Any,
+    Callable,
+    Dict,
+    Iterable,
+    Optional,
+    TypeVar,
+    Union,
+    cast,
+)
 
+from asgiref.sync import async_to_sync
 from django.core.exceptions import ValidationError as DjangoValidationError
 from django.utils.translation import ugettext as _
 from mypy_extensions import TypedDict
 
+from ..utils.cache import element_cache
 from ..utils.collection import CollectionElement
 from .exceptions import ConfigError, ConfigNotFound
 from .models import ConfigStore
 
+
 INPUT_TYPE_MAPPING = {
     'string': str,
     'text': str,
@@ -37,21 +49,42 @@ class ConfigHandler:
         self.config_variables = {}  # type: Dict[str, ConfigVariable]
 
         # Index to get the database id from a given config key
-        self.key_to_id = {}  # type: Dict[str, int]
+        self.key_to_id = None  # type: Optional[Dict[str, int]]
 
     def __getitem__(self, key: str) -> Any:
         """
         Returns the value of the config variable.
         """
-        # Build the key_to_id dict
-        self.save_default_values()
-
         if not self.exists(key):
             raise ConfigNotFound(_('The config variable {} was not found.').format(key))
 
         return CollectionElement.from_values(
             self.get_collection_string(),
-            self.key_to_id[key]).get_full_data()['value']
+            self.get_key_to_id()[key]).get_full_data()['value']
+
+    def get_key_to_id(self) -> Dict[str, int]:
+        """
+        Returns the key_to_id dict. Builds it, if it does not exist.
+        """
+        if self.key_to_id is None:
+            async_to_sync(self.build_key_to_id)()
+            self.key_to_id = cast(Dict[str, int], self.key_to_id)
+        return self.key_to_id
+
+    async def build_key_to_id(self) -> None:
+        """
+        Build the key_to_id dict.
+
+        Recreates it, if it does not exists.
+
+        This uses the element_cache. It expects, that the config values are in the database
+        before this is called.
+        """
+        self.key_to_id = {}
+        all_data = await element_cache.get_all_full_data()
+        elements = all_data[self.get_collection_string()]
+        for element in elements:
+            self.key_to_id[element['key']] = element['id']
 
     def exists(self, key: str) -> bool:
         """
@@ -183,19 +216,17 @@ class ConfigHandler:
         Saves the default values to the database.
 
         Does also build the dictonary key_to_id.
-
-        Does nothing on a second run.
         """
-        if not self.key_to_id:
+        self.key_to_id = {}
-            for item in self.config_variables.values():
+        for item in self.config_variables.values():
-                try:
+            try:
-                    db_value = ConfigStore.objects.get(key=item.name)
+                db_value = ConfigStore.objects.get(key=item.name)
-                except ConfigStore.DoesNotExist:
+            except ConfigStore.DoesNotExist:
-                    db_value = ConfigStore()
+                db_value = ConfigStore()
-                    db_value.key = item.name
+                db_value.key = item.name
-                    db_value.value = item.default_value
+                db_value.value = item.default_value
-                    db_value.save(skip_autoupdate=True)
+                db_value.save(skip_autoupdate=True)
-                self.key_to_id[item.name] = db_value.pk
+            self.key_to_id[db_value.key] = db_value.id
 
     def get_collection_string(self) -> str:
         """

openslides/core/management/commands/collectstatic.py

@@ -2,8 +2,9 @@ import os
 from typing import Any, Dict
 
 from django.conf import settings
-from django.contrib.staticfiles.management.commands.collectstatic import \
+from django.contrib.staticfiles.management.commands.collectstatic import (
-    Command as CollectStatic
+    Command as CollectStatic,
+)
 from django.core.management.base import CommandError
 from django.db.utils import OperationalError
 

openslides/core/management/commands/getgeiss.py

@@ -1,91 +0,0 @@
-import distutils
-import json
-import os
-import stat
-import sys
-from urllib.request import urlopen, urlretrieve
-
-from django.core.management.base import BaseCommand, CommandError
-
-from openslides.utils.main import get_geiss_path
-
-
-class Command(BaseCommand):
-    """
-    Command to get the latest release of Geiss from GitHub.
-    """
-    help = 'Get the latest Geiss release from GitHub.'
-
-    FIRST_NOT_SUPPORTED_VERSION = '1.0.0'
-
-    def handle(self, *args, **options):
-        geiss_github_name = self.get_geiss_github_name()
-        download_file = get_geiss_path()
-
-        if os.path.isfile(download_file):
-            # Geiss does probably exist. Do nothing.
-            # TODO: Add an update flag, that Geiss is downloaded anyway.
-            return
-
-        release = self.get_release()
-        download_url = None
-        for asset in release['assets']:
-            if asset['name'] == geiss_github_name:
-                download_url = asset['browser_download_url']
-                break
-        if download_url is None:
-            raise CommandError("Could not find download URL in release.")
-
-        urlretrieve(download_url, download_file)
-
-        # Set the executable bit on the file. This will do nothing on windows
-        st = os.stat(download_file)
-        os.chmod(download_file, st.st_mode | stat.S_IEXEC)
-
-        self.stdout.write(self.style.SUCCESS('Geiss {} successfully downloaded.'.format(release['tag_name'])))
-
-    def get_release(self):
-        """
-        Returns API data for the latest supported Geiss release.
-        """
-        response = urlopen(self.get_geiss_url()).read()
-        releases = json.loads(response.decode())
-        for release in releases:
-            version = distutils.version.StrictVersion(release['tag_name'])  # type: ignore
-            if version < self.FIRST_NOT_SUPPORTED_VERSION:
-                break
-        else:
-            raise CommandError('Could not find Geiss release.')
-        return release
-
-    def get_geiss_url(self):
-        """
-        Returns the URL to the API which gives the information which Geiss
-        binary has to be downloaded.
-
-        Currently this is a static GitHub URL to the repository where Geiss
-        is hosted at the moment.
-        """
-        # TODO: Use a settings variable or a command line flag in the future.
-        return 'https://api.github.com/repos/ostcar/geiss/releases'
-
-    def get_geiss_github_name(self):
-        """
-        Returns the name of the Geiss executable for the current operating
-        system.
-
-        For example geiss_windows_64 on a windows64 platform.
-        """
-        # This will be 32 if the current python interpreter has only
-        # 32 bit, even if it is run on a 64 bit operating sysem.
-        bits = '64' if sys.maxsize > 2**32 else '32'
-
-        geiss_names = {
-            'linux': 'geiss_linux_{bits}',
-            'win32': 'geiss_windows_{bits}.exe',  # Yes, it is win32, even on a win64 system!
-            'darwin': 'geiss_mac_{bits}'}
-
-        try:
-            return geiss_names[sys.platform].format(bits=bits)
-        except KeyError:
-            raise CommandError("Plattform {} is not supported by Geiss".format(sys.platform))

openslides/core/migrations/0005_auto_20170412_1258.py

@@ -4,8 +4,9 @@ from __future__ import unicode_literals
 
 from django.db import migrations
 
-from openslides.utils.migrations import \
+from openslides.utils.migrations import (
-    add_permission_to_groups_based_on_existing_permission
+    add_permission_to_groups_based_on_existing_permission,
+)
 
 
 class Migration(migrations.Migration):

openslides/core/signals.py

@@ -8,6 +8,7 @@ from ..utils.auth import has_perm
 from ..utils.collection import Collection
 from .models import ChatMessage
 
+
 # This signal is send when the migrate command is done. That means it is sent
 # after post_migrate sending and creating all Permission objects. Don't use it
 # for other things than dealing with Permission objects.
@@ -38,18 +39,18 @@ def delete_django_app_permissions(sender, **kwargs):
 
 def get_permission_change_data(sender, permissions, **kwargs):
     """
-    Yields all necessary collections if the respective permissions change.
+    Yields all necessary Cachables if the respective permissions change.
     """
     core_app = apps.get_app_config(app_label='core')
     for permission in permissions:
         if permission.content_type.app_label == core_app.label:
             if permission.codename == 'can_see_projector':
-                yield Collection(core_app.get_model('Projector').get_collection_string())
+                yield core_app.get_model('Projector')
             elif permission.codename == 'can_manage_projector':
-                yield Collection(core_app.get_model('ProjectorMessage').get_collection_string())
+                yield core_app.get_model('ProjectorMessage')
-                yield Collection(core_app.get_model('Countdown').get_collection_string())
+                yield core_app.get_model('Countdown')
             elif permission.codename == 'can_use_chat':
-                yield Collection(core_app.get_model('ChatMessage').get_collection_string())
+                yield core_app.get_model('ChatMessage')
 
 
 def required_users(sender, request_user, **kwargs):

openslides/core/urls.py

@@ -2,6 +2,7 @@ from django.conf.urls import url
 
 from . import views
 
+
 urlpatterns = [
     url(r'^core/servertime/$',
         views.ServerTime.as_view(),

openslides/core/views.py

@@ -11,9 +11,7 @@ from django.utils.timezone import now
 from django.utils.translation import ugettext as _
 from mypy_extensions import TypedDict
 
-from .. import __license__ as license
+from .. import __license__ as license, __url__ as url, __version__ as version
-from .. import __url__ as url
-from .. import __version__ as version
 from ..utils import views as utils_views
 from ..utils.auth import anonymous_is_enabled, has_perm
 from ..utils.autoupdate import inform_changed_data, inform_deleted_data

openslides/global_settings.py

@@ -2,6 +2,7 @@ import os
 
 from openslides.utils.plugins import collect_plugins
 
+
 MODULE_DIR = os.path.realpath(os.path.dirname(os.path.abspath(__file__)))
 
 
@@ -121,31 +122,14 @@ PASSWORD_HASHERS = [
 MEDIA_URL = '/media/'
 
 
-# Cache
-# https://docs.djangoproject.com/en/1.10/topics/cache/
-
-CACHES = {
-    'default': {
-        'BACKEND': 'django.core.cache.backends.locmem.LocMemCache',
-        'LOCATION': 'openslides-cache',
-        'OPTIONS': {
-            'MAX_ENTRIES': 10000
-        }
-    }
-}
-
-
 # Django Channels
 # http://channels.readthedocs.io/en/latest/
-# https://github.com/ostcar/geiss
+
+ASGI_APPLICATION = 'openslides.routing.application'
 
 CHANNEL_LAYERS = {
     'default': {
-        'BACKEND': 'asgiref.inmemory.ChannelLayer',
+        'BACKEND': 'channels.layers.InMemoryChannelLayer',
-        'ROUTING': 'openslides.routing.channel_routing',
-        'CONFIG': {
-            'capacity': 1000,
-        },
     },
 }
 

openslides/mediafiles/apps.py

@@ -1,6 +1,5 @@
 from django.apps import AppConfig
 
-from ..utils.collection import Collection
 from ..utils.projector import register_projector_elements
 
 
@@ -34,7 +33,7 @@ class MediafilesAppConfig(AppConfig):
 
     def get_startup_elements(self):
         """
-        Yields all collections required on startup i. e. opening the websocket
+        Yields all Cachables required on startup i. e. opening the websocket
         connection.
         """
-        yield Collection(self.get_model('Mediafile').get_collection_string())
+        yield self.get_model('Mediafile')

openslides/motions/apps.py

@@ -1,7 +1,6 @@
 from django.apps import AppConfig
 from django.db.models.signals import post_migrate
 
-from ..utils.collection import Collection
 from ..utils.projector import register_projector_elements
 
 
@@ -60,8 +59,8 @@ class MotionsAppConfig(AppConfig):
 
     def get_startup_elements(self):
         """
-        Yields all collections required on startup i. e. opening the websocket
+        Yields all Cachables required on startup i. e. opening the websocket
         connection.
         """
-        for model in ('Category', 'Motion', 'MotionBlock', 'Workflow', 'MotionChangeRecommendation'):
+        for model_name in ('Category', 'Motion', 'MotionBlock', 'Workflow', 'MotionChangeRecommendation'):
-            yield Collection(self.get_model(model).get_collection_string())
+            yield self.get_model(model_name)

openslides/motions/models.py

@@ -7,8 +7,11 @@ from django.core.exceptions import ImproperlyConfigured, ValidationError
 from django.db import IntegrityError, models, transaction
 from django.db.models import Max
 from django.utils import formats, timezone
-from django.utils.translation import ugettext as _
+from django.utils.translation import (
-from django.utils.translation import ugettext_lazy, ugettext_noop
+    ugettext as _,
+    ugettext_lazy,
+    ugettext_noop,
+)
 from jsonfield import JSONField
 
 from openslides.agenda.models import Item

openslides/motions/urls.py

@@ -2,6 +2,7 @@ from django.conf.urls import url
 
 from . import views
 
+
 urlpatterns = [
     url(r'^docxtemplate/$',
         views.MotionDocxTemplateView.as_view(),

openslides/motions/views.py

@@ -8,8 +8,7 @@ from django.db import IntegrityError, transaction
 from django.db.models.deletion import ProtectedError
 from django.http import Http404
 from django.http.request import QueryDict
-from django.utils.translation import ugettext as _
+from django.utils.translation import ugettext as _, ugettext_noop
-from django.utils.translation import ugettext_noop
 from rest_framework import status
 
 from ..core.config import config

openslides/routing.py

@@ -1,31 +1,16 @@
-from channels.routing import include, route
+from channels.routing import ProtocolTypeRouter, URLRouter
+from django.conf.urls import url
 
-from openslides.utils.autoupdate import (
+from openslides.utils.consumers import ProjectorConsumer, SiteConsumer
-    send_data_projector,
+from openslides.utils.middleware import AuthMiddlewareStack
-    send_data_site,
-    ws_add_projector,
-    ws_add_site,
-    ws_disconnect_projector,
-    ws_disconnect_site,
-    ws_receive_projector,
-    ws_receive_site,
-)
 
-projector_routing = [
-    route("websocket.connect", ws_add_projector),
-    route("websocket.disconnect", ws_disconnect_projector),
-    route("websocket.receive", ws_receive_projector),
-]
 
-site_routing = [
+application = ProtocolTypeRouter({
-    route("websocket.connect", ws_add_site),
+    # WebSocket chat handler
-    route("websocket.disconnect", ws_disconnect_site),
+    "websocket": AuthMiddlewareStack(
-    route("websocket.receive", ws_receive_site),
+        URLRouter([
-]
+            url(r"^ws/site/$", SiteConsumer),
-
+            url(r"^ws/projector/(?P<projector_id>\d+)/$", ProjectorConsumer),
-channel_routing = [
+        ])
-    include(projector_routing, path=r'^/ws/projector/(?P<projector_id>\d+)/$'),
+    )
-    include(site_routing, path=r'^/ws/site/$'),
+})
-    route("autoupdate.send_data_projector", send_data_projector),
-    route("autoupdate.send_data_site", send_data_site),
-]

openslides/topics/apps.py

@@ -1,6 +1,5 @@
 from django.apps import AppConfig
 
-from ..utils.collection import Collection
 from ..utils.projector import register_projector_elements
 
 
@@ -31,7 +30,7 @@ class TopicsAppConfig(AppConfig):
 
     def get_startup_elements(self):
         """
-        Yields all collections required on startup i. e. opening the websocket
+        Yields all Cachables required on startup i. e. opening the websocket
         connection.
         """
-        yield Collection(self.get_model('Topic').get_collection_string())
+        yield self.get_model('Topic')

openslides/urls.py

@@ -6,6 +6,7 @@ from openslides.mediafiles.views import protected_serve
 from openslides.utils.plugins import get_all_plugin_urlpatterns
 from openslides.utils.rest_api import router
 
+
 urlpatterns = get_all_plugin_urlpatterns()
 
 urlpatterns += [

openslides/users/access_permissions.py

@@ -43,16 +43,20 @@ class UserAccessPermissions(BaseAccessPermissions):
             """
             return {key: full_data[key] for key in whitelist}
 
-        # We have four sets of data to be sent:
+        # We have five sets of data to be sent:
-        # * full data i. e. all fields,
+        # * full data i. e. all fields (including session_auth_hash),
-        # * many data i. e. all fields but not the default password,
+        # * all data i. e. all fields but not session_auth_hash,
-        # * little data i. e. all fields but not the default password, comments and active status,
+        # * many data i. e. all fields but not the default password and session_auth_hash,
+        # * little data i. e. all fields but not the default password, session_auth_hash, comments and active status,
         # * no data.
 
-        # Prepare field set for users with "many" data and with "little" data.
+        # Prepare field set for users with "all" data, "many" data and with "little" data.
-        many_data_fields = set(USERCANSEEEXTRASERIALIZER_FIELDS)
+        all_data_fields = set(USERCANSEEEXTRASERIALIZER_FIELDS)
-        many_data_fields.add('groups_id')
+        all_data_fields.add('groups_id')
-        many_data_fields.discard('groups')
+        all_data_fields.discard('groups')
+        all_data_fields.add('default_password')
+        many_data_fields = all_data_fields.copy()
+        many_data_fields.discard('default_password')
         litte_data_fields = set(USERCANSEESERIALIZER_FIELDS)
         litte_data_fields.add('groups_id')
         litte_data_fields.discard('groups')
@@ -61,7 +65,7 @@ class UserAccessPermissions(BaseAccessPermissions):
         if has_perm(user, 'users.can_see_name'):
             if has_perm(user, 'users.can_see_extra_data'):
                 if has_perm(user, 'users.can_manage'):
-                    data = full_data
+                    data = [filtered_data(full, all_data_fields) for full in full_data]
                 else:
                     data = [filtered_data(full, many_data_fields) for full in full_data]
             else:

openslides/users/apps.py

@@ -2,7 +2,6 @@ from django.apps import AppConfig
 from django.conf import settings
 from django.contrib.auth.signals import user_logged_in
 
-from ..utils.collection import Collection
 from ..utils.projector import register_projector_elements
 
 
@@ -45,11 +44,11 @@ class UsersAppConfig(AppConfig):
 
     def get_startup_elements(self):
         """
-        Yields all collections required on startup i. e. opening the websocket
+        Yields all Cachables required on startup i. e. opening the websocket
         connection.
         """
-        for model in ('User', 'Group', 'PersonalNote'):
+        for model_name in ('User', 'Group', 'PersonalNote'):
-            yield Collection(self.get_model(model).get_collection_string())
+            yield self.get_model(model_name)
 
     def get_angular_constants(self):
         from django.contrib.auth.models import Permission

openslides/users/models.py

@@ -2,11 +2,11 @@ import smtplib
 from random import choice
 
 from django.contrib.auth.hashers import make_password
-from django.contrib.auth.models import Group as DjangoGroup
-from django.contrib.auth.models import GroupManager as _GroupManager
 from django.contrib.auth.models import (
     AbstractBaseUser,
     BaseUserManager,
+    Group as DjangoGroup,
+    GroupManager as _GroupManager,
     Permission,
     PermissionsMixin,
 )
@@ -286,6 +286,15 @@ class User(RESTModelMixin, PermissionsMixin, AbstractBaseUser):
 
         return False
 
+    @property
+    def session_auth_hash(self):
+        """
+        Returns the session auth hash of a user as attribute.
+
+        Needed for the django rest framework.
+        """
+        return self.get_session_auth_hash()
+
 
 class GroupManager(_GroupManager):
     """

openslides/users/serializers.py

@@ -1,7 +1,6 @@
 from django.contrib.auth.hashers import make_password
 from django.contrib.auth.models import Permission
-from django.utils.translation import ugettext as _
+from django.utils.translation import ugettext as _, ugettext_lazy
-from django.utils.translation import ugettext_lazy
 
 from ..utils.autoupdate import inform_changed_data
 from ..utils.rest_api import (
@@ -13,6 +12,7 @@ from ..utils.rest_api import (
 )
 from .models import Group, PersonalNote, User
 
+
 USERCANSEESERIALIZER_FIELDS = (
     'id',
     'username',
@@ -52,7 +52,7 @@ class UserFullSerializer(ModelSerializer):
 
     class Meta:
         model = User
-        fields = USERCANSEEEXTRASERIALIZER_FIELDS + ('default_password',)
+        fields = USERCANSEEEXTRASERIALIZER_FIELDS + ('default_password', 'session_auth_hash')
         read_only_fields = ('last_email_send',)
 
     def validate(self, data):

openslides/users/signals.py

@@ -81,7 +81,7 @@ def create_builtin_groups_and_admin(**kwargs):
         permission_dict['mediafiles.can_see'],
         permission_dict['motions.can_see'],
         permission_dict['users.can_see_name'], )
-    group_default = Group.objects.create(name='Default')
+    group_default = Group.objects.create(pk=1, name='Default')
     group_default.permissions.add(*base_permissions)
 
     # Delegates (pk 2)
@@ -99,7 +99,7 @@ def create_builtin_groups_and_admin(**kwargs):
         permission_dict['motions.can_create'],
         permission_dict['motions.can_support'],
         permission_dict['users.can_see_name'], )
-    group_delegates = Group.objects.create(name='Delegates')
+    group_delegates = Group.objects.create(pk=2, name='Delegates')
     group_delegates.permissions.add(*delegates_permissions)
 
     # Staff (pk 3)
@@ -130,7 +130,7 @@ def create_builtin_groups_and_admin(**kwargs):
         permission_dict['users.can_manage'],
         permission_dict['users.can_see_extra_data'],
         permission_dict['mediafiles.can_see_hidden'],)
-    group_staff = Group.objects.create(name='Staff')
+    group_staff = Group.objects.create(pk=3, name='Staff')
     group_staff.permissions.add(*staff_permissions)
 
     # Admin (pk 4)
@@ -164,7 +164,7 @@ def create_builtin_groups_and_admin(**kwargs):
         permission_dict['users.can_manage'],
         permission_dict['users.can_see_extra_data'],
         permission_dict['mediafiles.can_see_hidden'],)
-    group_admin = Group.objects.create(name='Admin')
+    group_admin = Group.objects.create(pk=4, name='Admin')
     group_admin.permissions.add(*admin_permissions)
 
     # Add users.can_see_name permission to staff/admin

openslides/users/urls.py

@@ -2,6 +2,7 @@ from django.conf.urls import url
 
 from . import views
 
+
 urlpatterns = [
     # Auth
     url(r'^login/$',

openslides/users/views.py

@@ -1,10 +1,13 @@
 import smtplib
 from typing import List  # noqa
 
+from asgiref.sync import async_to_sync
 from django.conf import settings
-from django.contrib.auth import login as auth_login
+from django.contrib.auth import (
-from django.contrib.auth import logout as auth_logout
+    login as auth_login,
-from django.contrib.auth import update_session_auth_hash
+    logout as auth_logout,
+    update_session_auth_hash,
+)
 from django.contrib.auth.forms import AuthenticationForm
 from django.contrib.auth.password_validation import validate_password
 from django.core import mail
@@ -15,13 +18,17 @@ from django.utils.translation import ugettext as _
 
 from ..core.config import config
 from ..core.signals import permission_change
-from ..utils.auth import anonymous_is_enabled, has_perm
+from ..utils.auth import (
+    anonymous_is_enabled,
+    has_perm,
+    user_to_collection_user,
+)
 from ..utils.autoupdate import (
     inform_changed_data,
     inform_data_collection_element_list,
 )
-from ..utils.cache import restricted_data_cache
+from ..utils.cache import element_cache
-from ..utils.collection import CollectionElement
+from ..utils.collection import Collection, CollectionElement
 from ..utils.rest_api import (
     ModelViewSet,
     Response,
@@ -103,7 +110,7 @@ class UserViewSet(ModelViewSet):
                     del request.data[key]
         response = super().update(request, *args, **kwargs)
         # Maybe some group assignments have changed. Better delete the restricted user cache
-        restricted_data_cache.del_user(user.id)
+        async_to_sync(element_cache.del_user)(user_to_collection_user(user))
         return response
 
     def destroy(self, request, *args, **kwargs):
@@ -303,7 +310,7 @@ class GroupViewSet(ModelViewSet):
 
             # Delete the user chaches of all affected users
             for user in group.user_set.all():
-                restricted_data_cache.del_user(user.id)
+                async_to_sync(element_cache.del_user)(user_to_collection_user(user))
 
             def diff(full, part):
                 """
@@ -321,8 +328,8 @@ class GroupViewSet(ModelViewSet):
                 collection_elements = []  # type: List[CollectionElement]
                 signal_results = permission_change.send(None, permissions=new_permissions, action='added')
                 for receiver, signal_collections in signal_results:
-                    for collection in signal_collections:
+                    for cachable in signal_collections:
-                        collection_elements.extend(collection.element_generator())
+                        collection_elements.extend(Collection(cachable.get_collection_string()).element_generator())
                 inform_data_collection_element_list(collection_elements)
 
             # TODO: Some permissions are deleted.

openslides/utils/auth.py

@@ -1,9 +1,10 @@
-from typing import Optional, Union
+from typing import Dict, Optional, Union, cast
 
 from django.contrib.auth import get_user_model
 from django.contrib.auth.models import AnonymousUser
 from django.db.models import Model
 
+from .cache import element_cache
 from .collection import CollectionElement
 
 
@@ -46,6 +47,18 @@ def anonymous_is_enabled() -> bool:
     return config['general_system_enable_anonymous']
 
 
+async def async_anonymous_is_enabled() -> bool:
+    """
+    Like anonymous_is_enabled but async.
+    """
+    from ..core.config import config
+    if config.key_to_id is None:
+        await config.build_key_to_id()
+        config.key_to_id = cast(Dict[str, int], config.key_to_id)
+    element = await element_cache.get_element_full_data(config.get_collection_string(), config.key_to_id['general_system_enable_anonymous'])
+    return False if element is None else element['value']
+
+
 AnyUser = Union[Model, CollectionElement, int, AnonymousUser, None]
 
 
@@ -75,7 +88,11 @@ def user_to_collection_user(user: AnyUser) -> Optional[CollectionElement]:
             "Unsupported type for user. Only CollectionElements for users can be"
             "used. Not {}".format(user.collection_string))
     elif isinstance(user, int):
-        user = CollectionElement.from_values(User.get_collection_string(), user)
+        # user 0 means anonymous
+        if user == 0:
+            user = None
+        else:
+            user = CollectionElement.from_values(User.get_collection_string(), user)
     elif isinstance(user, AnonymousUser):
         user = None
     elif isinstance(user, User):

openslides/utils/autoupdate.py

@@ -1,366 +1,14 @@
-import json
 import threading
-import time
+from collections import OrderedDict
-import warnings
+from typing import Any, Dict, Iterable, List, Optional, Tuple, Union
-from collections import OrderedDict, defaultdict
-from typing import Any, Dict, Generator, Iterable, List, Optional, Tuple, Union
 
-from channels import Channel, Group
+from asgiref.sync import async_to_sync
-from channels.asgi import get_channel_layer
+from channels.layers import get_channel_layer
-from channels.auth import channel_session_user, channel_session_user_from_http
+from django.conf import settings
-from django.apps import apps
-from django.core.exceptions import ObjectDoesNotExist
-from django.db import transaction
 from django.db.models import Model
 
-from ..core.config import config
+from .cache import element_cache, get_element_id
-from ..core.models import Projector
+from .collection import CollectionElement, to_channel_message
-from .auth import anonymous_is_enabled, has_perm, user_to_collection_user
-from .cache import restricted_data_cache, websocket_user_cache
-from .collection import AutoupdateFormat  # noqa
-from .collection import (
-    ChannelMessageFormat,
-    Collection,
-    CollectionElement,
-    format_for_autoupdate,
-    from_channel_message,
-    to_channel_message,
-)
-
-
-def send_or_wait(send_func: Any, *args: Any, **kwargs: Any) -> None:
-    """
-    Wrapper for channels' send() method.
-
-    If the method send() raises ChannelFull exception the worker waits for 20
-    milliseconds and tries again. After 5 secondes it gives up, drops the
-    channel message and writes a warning to stderr.
-
-    Django channels' consumer atomicity feature is disabled.
-    """
-    kwargs['immediately'] = True
-    for i in range(250):
-        try:
-            send_func(*args, **kwargs)
-        except get_channel_layer().ChannelFull:
-            time.sleep(0.02)
-        else:
-            break
-    else:
-        warnings.warn(
-            'Channel layer is full. Channel message dropped.',
-            RuntimeWarning
-        )
-
-
-@channel_session_user_from_http
-def ws_add_site(message: Any) -> None:
-    """
-    Adds the websocket connection to a group specific to the connecting user.
-
-    The group with the name 'user-None' stands for all anonymous users.
-
-    Send all "startup-data" through the connection.
-    """
-    if not anonymous_is_enabled() and not message.user.id:
-        send_or_wait(message.reply_channel.send, {'accept': False})
-        return
-
-    Group('site').add(message.reply_channel)
-    message.channel_session['user_id'] = message.user.id
-    # Saves the reply channel to the user. Uses 0 for anonymous users.
-    websocket_user_cache.add(message.user.id or 0, message.reply_channel.name)
-
-    # Open the websocket connection.
-    send_or_wait(message.reply_channel.send, {'accept': True})
-
-    # Collect all elements that shoud be send to the client when the websocket
-    # connection is established.
-    user = user_to_collection_user(message.user.id)
-    user_id = user.id if user is not None else 0
-    if restricted_data_cache.exists_for_user(user_id):
-        output = restricted_data_cache.get_data(user_id)
-    else:
-        output = []
-        for collection in get_startup_collections():
-            access_permissions = collection.get_access_permissions()
-            restricted_data = access_permissions.get_restricted_data(collection.get_full_data(), user)
-
-            for data in restricted_data:
-                if data is None:
-                    # We do not want to send 'deleted' objects on startup.
-                    # That's why we skip such data.
-                    continue
-
-                formatted_data = format_for_autoupdate(
-                    collection_string=collection.collection_string,
-                    id=data['id'],
-                    action='changed',
-                    data=data)
-
-                output.append(formatted_data)
-                # Cache restricted data for user
-                restricted_data_cache.add_element(
-                    user_id,
-                    collection.collection_string,
-                    data['id'],
-                    formatted_data)
-
-    # Send all data.
-    if output:
-        send_or_wait(message.reply_channel.send, {'text': json.dumps(output)})
-
-
-@channel_session_user
-def ws_disconnect_site(message: Any) -> None:
-    """
-    This function is called, when a client on the site disconnects.
-    """
-    Group('site').discard(message.reply_channel)
-    websocket_user_cache.remove(message.user.id or 0, message.reply_channel.name)
-
-
-@channel_session_user
-def ws_receive_site(message: Any) -> None:
-    """
-    If we recieve something from the client we currently just interpret this
-    as a notify message.
-
-    The server adds the sender's user id (0 for anonymous) and reply
-    channel name so that a receiver client may reply to the sender or to all
-    sender's instances.
-    """
-    try:
-        incomming = json.loads(message.content['text'])
-    except ValueError:
-        # Message content is invalid. Just do nothing.
-        pass
-    else:
-        if isinstance(incomming, list):
-            notify(
-                incomming,
-                senderReplyChannelName=message.reply_channel.name,
-                senderUserId=message.user.id or 0)
-
-
-def notify(incomming: List[Dict[str, Any]], **attributes: Any) -> None:
-    """
-    The incomming should be a list of notify elements. Every item is broadcasted
-    to the given users, channels or projectors. If none is given, the message is
-    send to each site client.
-    """
-    # Parse all items
-    receivers_users = defaultdict(list)  # type: Dict[int, List[Any]]
-    receivers_projectors = defaultdict(list)  # type: Dict[int, List[Any]]
-    receivers_reply_channels = defaultdict(list)  # type: Dict[str, List[Any]]
-    items_for_all = []
-    for item in incomming:
-        if item.get('collection') == 'notify':
-            use_receivers_dict = False
-
-            for key, value in attributes.items():
-                item[key] = value
-
-            # Force the params to be a dict
-            if not isinstance(item.get('params'), dict):
-                item['params'] = {}
-
-            users = item.get('users')
-            if isinstance(users, list):
-                # Send this item only to all reply channels of some site users.
-                for user_id in users:
-                    receivers_users[user_id].append(item)
-                use_receivers_dict = True
-
-            projectors = item.get('projectors')
-            if isinstance(projectors, list):
-                # Send this item only to all reply channels of some site users.
-                for projector_id in projectors:
-                    receivers_projectors[projector_id].append(item)
-                use_receivers_dict = True
-
-            reply_channels = item.get('replyChannels')
-            if isinstance(reply_channels, list):
-                # Send this item only to some reply channels.
-                for reply_channel_name in reply_channels:
-                    receivers_reply_channels[reply_channel_name].append(item)
-                use_receivers_dict = True
-
-            if not use_receivers_dict:
-                # Send this item to all reply channels.
-                items_for_all.append(item)
-
-    # Send all items
-    for user_id, channel_names in websocket_user_cache.get_all().items():
-        output = receivers_users[user_id]
-        if len(output) > 0:
-            for channel_name in channel_names:
-                send_or_wait(Channel(channel_name).send, {'text': json.dumps(output)})
-
-    for channel_name, output in receivers_reply_channels.items():
-        if len(output) > 0:
-            send_or_wait(Channel(channel_name).send, {'text': json.dumps(output)})
-
-    for projector_id, output in receivers_projectors.items():
-        if len(output) > 0:
-            send_or_wait(Group('projector-{}'.format(projector_id)).send, {'text': json.dumps(output)})
-
-    if len(items_for_all) > 0:
-        send_or_wait(Group('site').send, {'text': json.dumps(items_for_all)})
-
-
-@channel_session_user_from_http
-def ws_add_projector(message: Any, projector_id: int) -> None:
-    """
-    Adds the websocket connection to a group specific to the projector with the given id.
-    Also sends all data that are shown on the projector.
-    """
-    user = user_to_collection_user(message.user.id)
-
-    if not has_perm(user, 'core.can_see_projector'):
-        send_or_wait(message.reply_channel.send, {'text': 'No permissions to see this projector.'})
-    else:
-        try:
-            projector = Projector.objects.get(pk=projector_id)
-        except Projector.DoesNotExist:
-            send_or_wait(message.reply_channel.send, {'text': 'The projector {} does not exist.'.format(projector_id)})
-        else:
-            # At first, the client is added to the projector group, so it is
-            # informed if the data change.
-            Group('projector-{}'.format(projector_id)).add(message.reply_channel)
-
-            # Then it is also added to the global projector group which is
-            # used for broadcasting data.
-            Group('projector-all').add(message.reply_channel)
-
-            # Now check whether broadcast is active at the moment. If yes,
-            # change the local projector variable.
-            if config['projector_broadcast'] > 0:
-                projector = Projector.objects.get(pk=config['projector_broadcast'])
-
-            # Collect all elements that are on the projector.
-            output = []  # type: List[AutoupdateFormat]
-            for requirement in projector.get_all_requirements():
-                required_collection_element = CollectionElement.from_instance(requirement)
-                output.append(required_collection_element.as_autoupdate_for_projector())
-
-            # Collect all config elements.
-            config_collection = Collection(config.get_collection_string())
-            projector_data = (config_collection.get_access_permissions()
-                              .get_projector_data(config_collection.get_full_data()))
-            for data in projector_data:
-                output.append(format_for_autoupdate(
-                    config_collection.collection_string,
-                    data['id'],
-                    'changed',
-                    data))
-
-            # Collect the projector instance.
-            collection_element = CollectionElement.from_instance(projector)
-            output.append(collection_element.as_autoupdate_for_projector())
-
-            # Send all the data that were only collected before.
-            send_or_wait(message.reply_channel.send, {'text': json.dumps(output)})
-
-
-def ws_disconnect_projector(message: Any, projector_id: int) -> None:
-    """
-    This function is called, when a client on the projector disconnects.
-    """
-    Group('projector-{}'.format(projector_id)).discard(message.reply_channel)
-    Group('projector-all').discard(message.reply_channel)
-
-
-def ws_receive_projector(message: Any, projector_id: int) -> None:
-    """
-    If we recieve something from the client we currently just interpret this
-    as a notify message.
-
-    The server adds the sender's projector id and reply channel name so that
-    a receiver client may reply to the sender or to all sender's instances.
-    """
-    try:
-        incomming = json.loads(message.content['text'])
-    except ValueError:
-        # Message content is invalid. Just do nothing.
-        pass
-    else:
-        if isinstance(incomming, list):
-            notify(
-                incomming,
-                senderReplyChannelName=message.reply_channel.name,
-                senderProjectorId=projector_id)
-
-
-def send_data_projector(message: ChannelMessageFormat) -> None:
-    """
-    Informs all projector clients about changed data.
-    """
-    collection_elements = from_channel_message(message)
-
-    # Check whether broadcast is active at the moment and set the local
-    # projector queryset.
-    if config['projector_broadcast'] > 0:
-        queryset = Projector.objects.filter(pk=config['projector_broadcast'])
-    else:
-        queryset = Projector.objects.all()
-
-    # Loop over all projectors and send data that they need.
-    for projector in queryset:
-        output = []
-        for collection_element in collection_elements:
-            if collection_element.is_deleted():
-                output.append(collection_element.as_autoupdate_for_projector())
-            else:
-                for element in projector.get_collection_elements_required_for_this(collection_element):
-                    output.append(element.as_autoupdate_for_projector())
-        if output:
-            if config['projector_broadcast'] > 0:
-                send_or_wait(
-                    Group('projector-all').send,
-                    {'text': json.dumps(output)})
-            else:
-                send_or_wait(
-                    Group('projector-{}'.format(projector.pk)).send,
-                    {'text': json.dumps(output)})
-
-
-def send_data_site(message: ChannelMessageFormat) -> None:
-    """
-    Informs all site users about changed data.
-    """
-    collection_elements = from_channel_message(message)
-
-    # Send data to site users.
-    for user_id, channel_names in websocket_user_cache.get_all().items():
-        if not user_id:
-            # Anonymous user
-            user = None
-        else:
-            try:
-                user = user_to_collection_user(user_id)
-            except ObjectDoesNotExist:
-                # The user does not exist. Skip him/her.
-                continue
-
-        output = []
-        for collection_element in collection_elements:
-            formatted_data = collection_element.as_autoupdate_for_user(user)
-            if formatted_data['action'] == 'changed':
-                restricted_data_cache.update_element(
-                    user_id or 0,
-                    collection_element.collection_string,
-                    collection_element.id,
-                    formatted_data)
-            else:
-                restricted_data_cache.del_element(
-                    user_id or 0,
-                    collection_element.collection_string,
-                    collection_element.id)
-            output.append(formatted_data)
-
-        for channel_name in channel_names:
-            send_or_wait(Channel(channel_name).send, {'text': json.dumps(output)})
 
 
 def to_ordered_dict(d: Optional[Dict]) -> Optional[OrderedDict]:
@@ -377,7 +25,7 @@ def to_ordered_dict(d: Optional[Dict]) -> Optional[OrderedDict]:
 def inform_changed_data(instances: Union[Iterable[Model], Model], information: Dict[str, Any] = None) -> None:
     """
     Informs the autoupdate system and the caching system about the creation or
-    update of an element. This is done via the AutoupdateBundleMiddleware.
+    update of an element.
 
     The argument instances can be one instance or an iterable over instances.
     """
@@ -392,37 +40,47 @@ def inform_changed_data(instances: Union[Iterable[Model], Model], information: D
             # Instance has no method get_root_rest_element. Just ignore it.
             pass
 
-    # Put all collection elements into the autoupdate_bundle.
+    collection_elements = {}
+    for root_instance in root_instances:
+        collection_element = CollectionElement.from_instance(
+            root_instance,
+            information=information)
+        key = root_instance.get_collection_string() + str(root_instance.get_rest_pk()) + str(to_ordered_dict(information))
+        collection_elements[key] = collection_element
+
     bundle = autoupdate_bundle.get(threading.get_ident())
     if bundle is not None:
-        # Run autoupdate only if the bundle exists because we are in a request-response-cycle.
+        # Put all collection elements into the autoupdate_bundle.
-        for root_instance in root_instances:
+        bundle.update(collection_elements)
-            collection_element = CollectionElement.from_instance(
+    else:
-                root_instance,
+        # Send autoupdate directly
-                information=information)
+        async_to_sync(send_autoupdate)(collection_elements.values())
-            key = root_instance.get_collection_string() + str(root_instance.get_rest_pk()) + str(to_ordered_dict(information))
-            bundle[key] = collection_element
 
 
 def inform_deleted_data(elements: Iterable[Tuple[str, int]], information: Dict[str, Any] = None) -> None:
     """
     Informs the autoupdate system and the caching system about the deletion of
-    elements. This is done via the AutoupdateBundleMiddleware.
+    elements.
 
     The argument information is added to each collection element.
     """
-    # Put all stuff to be deleted into the autoupdate_bundle.
+    collection_elements = {}  # type: Dict[str, Any]
+    for element in elements:
+        collection_element = CollectionElement.from_values(
+            collection_string=element[0],
+            id=element[1],
+            deleted=True,
+            information=information)
+        key = element[0] + str(element[1]) + str(to_ordered_dict(information))
+        collection_elements[key] = collection_element
+
     bundle = autoupdate_bundle.get(threading.get_ident())
     if bundle is not None:
-        # Run autoupdate only if the bundle exists because we are in a request-response-cycle.
+        # Put all collection elements into the autoupdate_bundle.
-        for element in elements:
+        bundle.update(collection_elements)
-            collection_element = CollectionElement.from_values(
+    else:
-                collection_string=element[0],
+        # Send autoupdate directly
-                id=element[1],
+        async_to_sync(send_autoupdate)(collection_elements.values())
-                deleted=True,
-                information=information)
-            key = element[0] + str(element[1]) + str(to_ordered_dict(information))
-            bundle[key] = collection_element
 
 
 def inform_data_collection_element_list(collection_elements: List[CollectionElement],
@@ -431,13 +89,18 @@ def inform_data_collection_element_list(collection_elements: List[CollectionElem
     Informs the autoupdate system about some collection elements. This is
     used just to send some data to all users.
     """
-    # Put all stuff into the autoupdate_bundle.
+    elements = {}
+    for collection_element in collection_elements:
+        key = collection_element.collection_string + str(collection_element.id) + str(to_ordered_dict(information))
+        elements[key] = collection_element
+
     bundle = autoupdate_bundle.get(threading.get_ident())
     if bundle is not None:
-        # Run autoupdate only if the bundle exists because we are in a request-response-cycle.
+        # Put all collection elements into the autoupdate_bundle.
-        for collection_element in collection_elements:
+        bundle.update(elements)
-            key = collection_element.collection_string + str(collection_element.id) + str(to_ordered_dict(information))
+    else:
-            bundle[key] = collection_element
+        # Send autoupdate directly
+        async_to_sync(send_autoupdate)(elements.values())
 
 
 """
@@ -461,41 +124,48 @@ class AutoupdateBundleMiddleware:
         response = self.get_response(request)
 
         bundle = autoupdate_bundle.pop(thread_id)  # type: Dict[str, CollectionElement]
-        # If currently there is an open database transaction, then the
+        async_to_sync(send_autoupdate)(bundle.values())
-        # send_autoupdate function is only called, when the transaction is
-        # commited. If there is currently no transaction, then the function
-        # is called immediately.
-        transaction.on_commit(lambda: send_autoupdate(bundle.values()))
         return response
 
 
-def send_autoupdate(collection_elements: Iterable[CollectionElement]) -> None:
+async def send_autoupdate(collection_elements: Iterable[CollectionElement]) -> None:
     """
     Helper function, that sends collection_elements through a channel to the
     autoupdate system.
 
+    Also updates the redis cache.
+
     Does nothing if collection_elements is empty.
     """
     if collection_elements:
-        send_or_wait(
+        cache_elements = {}  # type: Dict[str, Optional[Dict[str, Any]]]
-            Channel('autoupdate.send_data_projector').send,
+        for element in collection_elements:
-            to_channel_message(collection_elements))
+            element_id = get_element_id(element.collection_string, element.id)
-        send_or_wait(
+            if element.is_deleted():
-            Channel('autoupdate.send_data_site').send,
+                cache_elements[element_id] = None
-            to_channel_message(collection_elements))
+            else:
+                cache_elements[element_id] = element.get_full_data()
 
+        if not getattr(settings, 'SKIP_CACHE', False):
+            # Hack for django 2.0 and channels 2.1 to stay in the same thread.
+            # This is needed for the tests.
+            change_id = await element_cache.change_elements(cache_elements)
+        else:
+            change_id = 1
 
-def get_startup_collections() -> Generator[Collection, None, None]:
+        channel_layer = get_channel_layer()
-    """
+        # TODO: don't await. They can be send in parallel
-    Returns all Collections that should be send to the user at startup
+        await channel_layer.group_send(
-    """
+            "projector",
-    for app in apps.get_app_configs():
+            {
-        try:
+                "type": "send_data",
-            # Get the method get_startup_elements() from an app.
+                "message": to_channel_message(collection_elements),
-            # This method has to return an iterable of Collection objects.
+            },
-            get_startup_elements = app.get_startup_elements
+        )
-        except AttributeError:
+        await channel_layer.group_send(
-            # Skip apps that do not implement get_startup_elements.
+            "site",
-            continue
+            {
-
+                "type": "send_data",
-        yield from get_startup_elements()
+                "change_id": change_id,
+            },
+        )

openslides/utils/cache.py

@@ -1,506 +1,417 @@
+import asyncio
 import json
 from collections import defaultdict
-from typing import (  # noqa
+from datetime import datetime
+from typing import (
     TYPE_CHECKING,
     Any,
     Callable,
     Dict,
-    Generator,
-    Iterable,
     List,
     Optional,
-    Set,
+    Tuple,
     Type,
-    Union,
 )
 
-from channels import Group
+from asgiref.sync import sync_to_async
-from channels.sessions import session_for_reply_channel
+from channels.db import database_sync_to_async
 from django.conf import settings
-from django.core.cache import cache, caches
+
+from .cache_providers import (
+    BaseCacheProvider,
+    Cachable,
+    MemmoryCacheProvider,
+    RedisCacheProvider,
+    get_all_cachables,
+    no_redis_dependency,
+)
+from .utils import get_element_id, get_user_id, split_element_id
+
 
 if TYPE_CHECKING:
-    # Dummy import Collection for mypy
+    # Dummy import Collection for mypy, can be fixed with python 3.7
-    from .collection import Collection  # noqa
+    from .collection import CollectionElement  # noqa
-
-UserCacheDataType = Dict[int, Set[str]]
 
 
-class BaseWebsocketUserCache:
+class ElementCache:
     """
-    Caches the reply channel names of all open websocket connections. The id of
+    Cache for the CollectionElements.
-    the user that that opened the connection is used as reference.
 
-    This is the Base cache that has to be overriden.
+    Saves the full_data and if enabled the restricted data.
-    """
-    cache_key = 'current_websocket_users'
 
-    def add(self, user_id: int, channel_name: str) -> None:
+    There is one redis Hash (simular to python dict) for the full_data and one
-        """
+    Hash for every user.
-        Adds a channel name to an user id.
-        """
-        raise NotImplementedError()
 
-    def remove(self, user_id: int, channel_name: str) -> None:
+    The key of the Hashes is COLLECTIONSTRING:ID where COLLECTIONSTRING is the
-        """
+    collection_string of a collection and id the id of an element.
-        Removes one channel name from the cache.
-        """
-        raise NotImplementedError()
 
-    def get_all(self) -> UserCacheDataType:
+    All elements have to be in the cache. If one element is missing, the cache
-        """
+    is invalid, but this can not be detected. When a plugin with a new
-        Returns all data using a dict where the key is a user id and the value
+    collection is added to OpenSlides, then the cache has to be rebuild manualy.
-        is a set of channel_names.
-        """
-        raise NotImplementedError()
 
-    def save_data(self, data: UserCacheDataType) -> None:
+    There is an sorted set in redis with the change id as score. The values are
-        """
+    COLLETIONSTRING:ID for the elements that have been changed with that change
-        Saves the full data set (like created with build_data) to the cache.
+    id. With this key it is possible, to get all elements as full_data or as
-        """
+    restricted_data that are newer then a specific change id.
-        raise NotImplementedError()
 
-    def build_data(self) -> UserCacheDataType:
+    All method of this class are async. You either have to call them with
-        """
+    await in an async environment or use asgiref.sync.async_to_sync().
-        Creates all the data, saves it to the cache and returns it.
-        """
-        websocket_user_ids = defaultdict(set)  # type: UserCacheDataType
-        for channel_name in Group('site').channel_layer.group_channels('site'):
-            session = session_for_reply_channel(channel_name)
-            user_id = session.get('user_id', None)
-            websocket_user_ids[user_id or 0].add(channel_name)
-        self.save_data(websocket_user_ids)
-        return websocket_user_ids
-
-    def get_cache_key(self) -> str:
-        """
-        Returns the cache key.
-        """
-        return self.cache_key
-
-
-class RedisWebsocketUserCache(BaseWebsocketUserCache):
-    """
-    Implementation of the WebsocketUserCache that uses redis.
-
-    This uses one cache key to store all connected user ids in a set and
-    for each user another set to save the channel names.
     """
 
-    def add(self, user_id: int, channel_name: str) -> None:
+    def __init__(
+            self,
+            redis: str,
+            use_restricted_data_cache: bool = False,
+            cache_provider_class: Type[BaseCacheProvider] = RedisCacheProvider,
+            cachable_provider: Callable[[], List[Cachable]] = get_all_cachables,
+            start_time: int = None) -> None:
         """
-        Adds a channel name to an user id.
+        Initializes the cache.
-        """
-        redis = get_redis_connection()
-        pipe = redis.pipeline()
-        pipe.sadd(self.get_cache_key(), user_id)
-        pipe.sadd(self.get_user_cache_key(user_id), channel_name)
-        pipe.execute()
 
-    def remove(self, user_id: int, channel_name: str) -> None:
+        When restricted_data_cache is false, no restricted data is saved.
         """
-        Removes one channel name from the cache.
+        self.use_restricted_data_cache = use_restricted_data_cache
-        """
+        self.cache_provider = cache_provider_class(redis)
-        redis = get_redis_connection()
+        self.cachable_provider = cachable_provider
-        redis.srem(self.get_user_cache_key(user_id), channel_name)
+        self._cachables = None  # type: Optional[Dict[str, Cachable]]
 
-    def get_all(self) -> UserCacheDataType:
+        # Start time is used as first change_id if there is non in redis
+        if start_time is None:
+            start_time = int((datetime.utcnow() - datetime(1970, 1, 1)).total_seconds())
+        self.start_time = start_time
+
+        # Contains Futures to controll, that only one client updates the restricted_data.
+        self.restricted_data_cache_updater = {}  # type: Dict[int, asyncio.Future]
+
+    @property
+    def cachables(self) -> Dict[str, Cachable]:
         """
-        Returns all data using a dict where the key is a user id and the value
+        Returns all Cachables as a dict where the key is the collection_string of the cachable.
-        is a set of channel_names.
         """
-        redis = get_redis_connection()
+        # This method is neccessary to lazy load the cachables
-        user_ids = redis.smembers(self.get_cache_key())  # type: Optional[List[str]]
+        if self._cachables is None:
-        if user_ids is None:
+            self._cachables = {cachable.get_collection_string(): cachable for cachable in self.cachable_provider()}
-            websocket_user_ids = self.build_data()
+        return self._cachables
+
+    async def save_full_data(self, db_data: Dict[str, List[Dict[str, Any]]]) -> None:
+        """
+        Saves the full data.
+        """
+        mapping = {}
+        for collection_string, elements in db_data.items():
+            for element in elements:
+                mapping.update(
+                    {get_element_id(collection_string, element['id']):
+                     json.dumps(element)})
+        await self.cache_provider.reset_full_cache(mapping)
+
+    async def build_full_data(self) -> Dict[str, List[Dict[str, Any]]]:
+        """
+        Build or rebuild the full_data cache.
+        """
+        db_data = {}  # type: Dict[str, List[Dict[str, Any]]]
+        for collection_string, cachable in self.cachables.items():
+            db_data[collection_string] = await database_sync_to_async(cachable.get_elements)()
+        await self.save_full_data(db_data)
+        return db_data
+
+    async def exists_full_data(self) -> bool:
+        """
+        Returns True, if the full_data_cache exists.
+        """
+        return await self.cache_provider.data_exists()
+
+    async def change_elements(
+            self, elements: Dict[str, Optional[Dict[str, Any]]]) -> int:
+        """
+        Changes elements in the cache.
+
+        elements is a list of the changed elements as dict. When the value is None,
+        it is interpreded as deleted. The key has to be an element_id.
+
+        Returns the new generated change_id.
+        """
+        if not await self.exists_full_data():
+            await self.build_full_data()
+
+        deleted_elements = []
+        changed_elements = []
+        for element_id, data in elements.items():
+            if data:
+                # The arguments for redis.hset is pairs of key value
+                changed_elements.append(element_id)
+                changed_elements.append(json.dumps(data))
+            else:
+                deleted_elements.append(element_id)
+
+        if changed_elements:
+            await self.cache_provider.add_elements(changed_elements)
+        if deleted_elements:
+            await self.cache_provider.del_elements(deleted_elements)
+
+        # TODO: The provider has to define the new change_id with lua. In other
+        #       case it is possible, that two changes get the same id (which
+        #       would not be a big problem).
+        change_id = await self.get_next_change_id()
+
+        await self.cache_provider.add_changed_elements(change_id, elements.keys())
+        return change_id
+
+    async def get_all_full_data(self) -> Dict[str, List[Dict[str, Any]]]:
+        """
+        Returns all full_data. If it does not exist, it is created.
+
+        The returned value is a dict where the key is the collection_string and
+        the value is a list of data.
+        """
+        if not await self.exists_full_data():
+            out = await self.build_full_data()
         else:
-            websocket_user_ids = dict()
+            out = defaultdict(list)
-            for redis_user_id in user_ids:
+            full_data = await self.cache_provider.get_all_data()
-                # Redis returns the id as string. So we have to convert it
+            for element_id, data in full_data.items():
-                user_id = int(redis_user_id)
+                collection_string, __ = split_element_id(element_id)
-                channel_names = redis.smembers(self.get_user_cache_key(user_id))  # type: Optional[List[str]]
+                out[collection_string].append(json.loads(data.decode()))
-                if channel_names is not None:
+        return dict(out)
-                    # If channel name is empty, then we can assume, that the user
-                    # has no active connection.
-                    websocket_user_ids[user_id] = set(channel_names)
-        return websocket_user_ids
 
-    def save_data(self, data: UserCacheDataType) -> None:
+    async def get_full_data(
+            self, change_id: int = 0) -> Tuple[Dict[str, List[Dict[str, Any]]], List[str]]:
         """
-        Saves the full data set (like created with the method build_data()) to
+        Returns all full_data since change_id. If it does not exist, it is created.
-        the cache.
+
+        Returns two values inside a tuple. The first value is a dict where the
+        key is the collection_string and the value is a list of data. The second
+        is a list of element_ids with deleted elements.
+
+        Only returns elements with the change_id or newer. When change_id is 0,
+        all elements are returned.
+
+        Raises a RuntimeError when the lowest change_id in redis is higher then
+        the requested change_id. In this case the method has to be rerun with
+        change_id=0. This is importend because there could be deleted elements
+        that the cache does not know about.
         """
-        redis = get_redis_connection()
+        if change_id == 0:
-        pipe = redis.pipeline()
+            return (await self.get_all_full_data(), [])
 
-        # Save all user ids
+        lowest_change_id = await self.get_lowest_change_id()
-        pipe.delete(self.get_cache_key())
+        if change_id < lowest_change_id:
-        pipe.sadd(self.get_cache_key(), *data.keys())
+            # When change_id is lower then the lowest change_id in redis, we can
+            # not inform the user about deleted elements.
+            raise RuntimeError(
+                "change_id {} is lower then the lowest change_id in redis {}. "
+                "Catch this exception and rerun the method with change_id=0."
+                .format(change_id, lowest_change_id))
 
-        for user_id, channel_names in data.items():
+        if not await self.exists_full_data():
-            pipe.delete(self.get_user_cache_key(user_id))
+            # If the cache does not exist, create it.
-            pipe.sadd(self.get_user_cache_key(user_id), *channel_names)
+            await self.build_full_data()
-        pipe.execute()
 
-    def get_cache_key(self) -> str:
+        raw_changed_elements, deleted_elements = await self.cache_provider.get_data_since(change_id)
+        return (
+            {collection_string: [json.loads(value.decode()) for value in value_list]
+             for collection_string, value_list in raw_changed_elements.items()},
+            deleted_elements)
+
+    async def get_element_full_data(self, collection_string: str, id: int) -> Optional[Dict[str, Any]]:
         """
-        Returns the cache key.
+        Returns one element as full data.
+
+        If the cache is empty, it is created.
+
+        Returns None if the element does not exist.
         """
-        return cache.make_key(self.cache_key)
+        if not await self.exists_full_data():
+            await self.build_full_data()
 
-    def get_user_cache_key(self, user_id: int) -> str:
+        element = await self.cache_provider.get_element(get_element_id(collection_string, id))
-        """
-        Returns a cache key to save the channel names for a specific user.
-        """
-        return cache.make_key('{}:{}'.format(self.cache_key, user_id))
 
-
-class DjangoCacheWebsocketUserCache(BaseWebsocketUserCache):
-    """
-    Implementation of the WebsocketUserCache that uses the django cache.
-
-    If you use this with the inmemory cache, then you should only use one
-    worker.
-
-    This uses only one cache key to save a dict where the key is the user id and
-    the value is a set of channel names.
-    """
-
-    def add(self, user_id: int, channel_name: str) -> None:
-        """
-        Adds a channel name for a user using the django cache.
-        """
-        websocket_user_ids = cache.get(self.get_cache_key())
-        if websocket_user_ids is None:
-            websocket_user_ids = dict()
-
-        if user_id in websocket_user_ids:
-            websocket_user_ids[user_id].add(channel_name)
-        else:
-            websocket_user_ids[user_id] = set([channel_name])
-        cache.set(self.get_cache_key(), websocket_user_ids)
-
-    def remove(self, user_id: int, channel_name: str) -> None:
-        """
-        Removes one channel name from the django cache.
-        """
-        websocket_user_ids = cache.get(self.get_cache_key())
-        if websocket_user_ids is not None and user_id in websocket_user_ids:
-            websocket_user_ids[user_id].discard(channel_name)
-            cache.set(self.get_cache_key(), websocket_user_ids)
-
-    def get_all(self) -> UserCacheDataType:
-        """
-        Returns the data using the django cache.
-        """
-        websocket_user_ids = cache.get(self.get_cache_key())
-        if websocket_user_ids is None:
-            return self.build_data()
-        return websocket_user_ids
-
-    def save_data(self, data: UserCacheDataType) -> None:
-        """
-        Saves the data using the django cache.
-        """
-        cache.set(self.get_cache_key(), data)
-
-
-class FullDataCache:
-    """
-    Caches all data as full data.
-
-    Helps to get all data from one collection.
-    """
-
-    base_cache_key = 'full_data_cache'
-
-    def build_for_collection(self, collection_string: str) -> None:
-        """
-        Build the cache for collection from a django model.
-
-        Rebuilds the cache for that collection, if it already exists.
-        """
-        redis = get_redis_connection()
-        pipe = redis.pipeline()
-
-        # Clear the cache for collection
-        pipe.delete(self.get_cache_key(collection_string))
-
-        # Save all elements
-        from .collection import get_model_from_collection_string
-        model = get_model_from_collection_string(collection_string)
-        try:
-            query = model.objects.get_full_queryset()
-        except AttributeError:
-            # If the model des not have to method get_full_queryset(), then use
-            # the default queryset from django.
-            query = model.objects
-
-        # Build a dict from the instance id to the full_data
-        mapping = {instance.pk: json.dumps(model.get_access_permissions().get_full_data(instance))
-                   for instance in query.all()}
-
-        if mapping:
-            # Save the dict into a redis map, if there is at least one value
-            pipe.hmset(
-                self.get_cache_key(collection_string),
-                mapping)
-
-        pipe.execute()
-
-    def add_element(self, collection_string: str, id: int, data: Dict[str, Any]) -> None:
-        """
-        Adds one element to the cache. If the cache does not exists for the collection,
-        it is created.
-        """
-        redis = get_redis_connection()
-
-        # If the cache does not exist for the collection, then create it first.
-        if not self.exists_for_collection(collection_string):
-            self.build_for_collection(collection_string)
-
-        redis.hset(
-            self.get_cache_key(collection_string),
-            id,
-            json.dumps(data))
-
-    def del_element(self, collection_string: str, id: int) -> None:
-        """
-        Removes one element from the cache.
-
-        Does nothing if the cache does not exist.
-        """
-        redis = get_redis_connection()
-        redis.hdel(
-            self.get_cache_key(collection_string),
-            id)
-
-    def exists_for_collection(self, collection_string: str) -> bool:
-        """
-        Returns True if the cache for the collection exists, else False.
-        """
-        redis = get_redis_connection()
-        return redis.exists(self.get_cache_key(collection_string))
-
-    def get_data(self, collection_string: str) -> List[Dict[str, Any]]:
-        """
-        Returns all data for the collection.
-        """
-        redis = get_redis_connection()
-        return [json.loads(element.decode()) for element in redis.hvals(self.get_cache_key(collection_string))]
-
-    def get_element(self, collection_string: str, id: int) -> Dict[str, Any]:
-        """
-        Returns one element from the collection.
-
-        Raises model.DoesNotExist if the element is not in the cache.
-        """
-        redis = get_redis_connection()
-        element = redis.hget(self.get_cache_key(collection_string), id)
         if element is None:
-            from .collection import get_model_from_collection_string
+            return None
-            model = get_model_from_collection_string(collection_string)
-            raise model.DoesNotExist(collection_string, id)
         return json.loads(element.decode())
 
-    def get_cache_key(self, collection_string: str) -> str:
+    async def exists_restricted_data(self, user: Optional['CollectionElement']) -> bool:
         """
-        Returns the cache key for a collection.
+        Returns True, if the restricted_data exists for the user.
         """
-        return cache.make_key('{}:{}'.format(self.base_cache_key, collection_string))
+        if not self.use_restricted_data_cache:
+            return False
+
+        return await self.cache_provider.data_exists(get_user_id(user))
+
+    async def del_user(self, user: Optional['CollectionElement']) -> None:
+        """
+        Removes one user from the resticted_data_cache.
+        """
+        await self.cache_provider.del_restricted_data(get_user_id(user))
+
+    async def update_restricted_data(
+            self, user: Optional['CollectionElement']) -> None:
+        """
+        Updates the restricted data for an user from the full_data_cache.
+        """
+        # TODO: When elements are changed at the same time then this method run
+        #       this could make the cache invalid.
+        #       This could be fixed when get_full_data would be used with a
+        #       max change_id.
+        if not self.use_restricted_data_cache:
+            # If the restricted_data_cache is not used, there is nothing to do
+            return
+
+        # Try to write a special key.
+        # If this succeeds, there is noone else currently updating the cache.
+        # TODO: Make a timeout. Else this could block forever
+        if await self.cache_provider.set_lock_restricted_data(get_user_id(user)):
+            future = asyncio.Future()  # type: asyncio.Future
+            self.restricted_data_cache_updater[get_user_id(user)] = future
+            # Get change_id for this user
+            value = await self.cache_provider.get_change_id_user(get_user_id(user))
+            # If the change id is not in the cache yet, use -1 to get all data since 0
+            user_change_id = int(value) if value else -1
+            change_id = await self.get_current_change_id()
+            if change_id > user_change_id:
+                try:
+                    full_data_elements, deleted_elements = await self.get_full_data(user_change_id + 1)
+                except RuntimeError:
+                    # The user_change_id is lower then the lowest change_id in the cache.
+                    # The whole restricted_data for that user has to be recreated.
+                    full_data_elements = await self.get_all_full_data()
+                    await self.cache_provider.del_restricted_data(get_user_id(user))
+                else:
+                    # Remove deleted elements
+                    if deleted_elements:
+                        await self.cache_provider.del_elements(deleted_elements, get_user_id(user))
+
+                mapping = {}
+                for collection_string, full_data in full_data_elements.items():
+                    restricter = self.cachables[collection_string].restrict_elements
+                    elements = await sync_to_async(restricter)(user, full_data)
+                    for element in elements:
+                        mapping.update(
+                            {get_element_id(collection_string, element['id']):
+                             json.dumps(element)})
+                mapping['_config:change_id'] = str(change_id)
+                await self.cache_provider.update_restricted_data(get_user_id(user), mapping)
+            # Unset the lock
+            await self.cache_provider.del_lock_restricted_data(get_user_id(user))
+            future.set_result(1)
+        else:
+            # Wait until the update if finshed
+            if get_user_id(user) in self.restricted_data_cache_updater:
+                # The active worker is on the same asgi server, we can use the future
+                await self.restricted_data_cache_updater[get_user_id(user)]
+            else:
+                while await self.cache_provider.get_lock_restricted_data(get_user_id(user)):
+                    await asyncio.sleep(0.01)
+
+    async def get_all_restricted_data(self, user: Optional['CollectionElement']) -> Dict[str, List[Dict[str, Any]]]:
+        """
+        Like get_all_full_data but with restricted_data for an user.
+        """
+        if not self.use_restricted_data_cache:
+            all_restricted_data = {}
+            for collection_string, full_data in (await self.get_all_full_data()).items():
+                restricter = self.cachables[collection_string].restrict_elements
+                elements = await sync_to_async(restricter)(user, full_data)
+                all_restricted_data[collection_string] = elements
+            return all_restricted_data
+
+        await self.update_restricted_data(user)
+
+        out = defaultdict(list)  # type: Dict[str, List[Dict[str, Any]]]
+        restricted_data = await self.cache_provider.get_all_data(get_user_id(user))
+        for element_id, data in restricted_data.items():
+            if element_id.decode().startswith('_config'):
+                continue
+            collection_string, __ = split_element_id(element_id)
+            out[collection_string].append(json.loads(data.decode()))
+        return dict(out)
+
+    async def get_restricted_data(
+            self,
+            user: Optional['CollectionElement'],
+            change_id: int = 0) -> Tuple[Dict[str, List[Dict[str, Any]]], List[str]]:
+        """
+        Like get_full_data but with restricted_data for an user.
+        """
+        if change_id == 0:
+            # Return all data
+            return (await self.get_all_restricted_data(user), [])
+
+        if not self.use_restricted_data_cache:
+            changed_elements, deleted_elements = await self.get_full_data(change_id)
+            restricted_data = {}
+            for collection_string, full_data in changed_elements.items():
+                restricter = self.cachables[collection_string].restrict_elements
+                elements = await sync_to_async(restricter)(user, full_data)
+                restricted_data[collection_string] = elements
+            return restricted_data, deleted_elements
+
+        lowest_change_id = await self.get_lowest_change_id()
+        if change_id < lowest_change_id:
+            # When change_id is lower then the lowest change_id in redis, we can
+            # not inform the user about deleted elements.
+            raise RuntimeError(
+                "change_id {} is lower then the lowest change_id in redis {}. "
+                "Catch this exception and rerun the method with change_id=0."
+                .format(change_id, lowest_change_id))
+
+        # If another coroutine or another daphne server also updates the restricted
+        # data, this waits until it is done.
+        await self.update_restricted_data(user)
+
+        raw_changed_elements, deleted_elements = await self.cache_provider.get_data_since(change_id, get_user_id(user))
+        return (
+            {collection_string: [json.loads(value.decode()) for value in value_list]
+             for collection_string, value_list in raw_changed_elements.items()},
+            deleted_elements)
+
+    async def get_current_change_id(self) -> int:
+        """
+        Returns the current change id.
+
+        Returns start_time if there is no change id yet.
+        """
+        value = await self.cache_provider.get_current_change_id()
+        if not value:
+            return self.start_time
+        # Return the score (second element) of the first (and only) element
+        return value[0][1]
+
+    async def get_next_change_id(self) -> int:
+        """
+        Returns the next change_id.
+
+        Returns the start time in seconds + 1, if there is no change_id in yet.
+        """
+        current_id = await self.get_current_change_id()
+        return current_id + 1
+
+    async def get_lowest_change_id(self) -> int:
+        """
+        Returns the lowest change id.
+
+        Raises a RuntimeError if there is no change_id.
+        """
+        value = await self.cache_provider.get_lowest_change_id()
+        if not value:
+            raise RuntimeError('There is no known change_id.')
+        # Return the score (second element) of the first (and only) element
+        return value
 
 
-class DummyFullDataCache:
+def load_element_cache(redis_addr: str = '', restricted_data: bool = True) -> ElementCache:
     """
-    Dummy FullDataCache that does nothing.
+    Generates an element cache instance.
     """
-    def build_for_collection(self, collection_string: str) -> None:
+    if not redis_addr:
-        pass
+        return ElementCache(redis='', cache_provider_class=MemmoryCacheProvider)
 
-    def add_element(self, collection_string: str, id: int, data: Dict[str, Any]) -> None:
+    if no_redis_dependency:
-        pass
+        raise ImportError("OpenSlides is configured to use redis as cache backend, but aioredis is not installed.")
-
+    return ElementCache(redis=redis_addr, use_restricted_data_cache=restricted_data)
-    def del_element(self, collection_string: str, id: int) -> None:
-        pass
-
-    def exists_for_collection(self, collection_string: str) -> bool:
-        return False
-
-    def get_data(self, collection_string: str) -> List[Dict[str, Any]]:
-        from .collection import get_model_from_collection_string
-        model = get_model_from_collection_string(collection_string)
-        try:
-            query = model.objects.get_full_queryset()
-        except AttributeError:
-            # If the model des not have to method get_full_queryset(), then use
-            # the default queryset from django.
-            query = model.objects
-
-        return [model.get_access_permissions().get_full_data(instance)
-                for instance in query.all()]
-
-    def get_element(self, collection_string: str, id: int) -> Dict[str, Any]:
-        from .collection import get_model_from_collection_string
-        model = get_model_from_collection_string(collection_string)
-        try:
-            query = model.objects.get_full_queryset()
-        except AttributeError:
-            # If the model des not have to method get_full_queryset(), then use
-            # the default queryset from django.
-            query = model.objects
-
-        return model.get_access_permissions().get_full_data(query.get(pk=id))
 
 
-class RestrictedDataCache:
+redis_address = getattr(settings, 'REDIS_ADDRESS', '')
-    """
+use_restricted_data = getattr(settings, 'RESTRICTED_DATA_CACHE', True)
-    Caches all data for a specific users.
+element_cache = load_element_cache(redis_addr=redis_address, restricted_data=use_restricted_data)
-
-    Helps to get all data from all collections for a specific user.
-
-    The cached values are expected to be formatted for outout via websocket.
-    """
-
-    base_cache_key = 'restricted_user_cache'
-
-    def update_element(self, user_id: int, collection_string: str, id: int, data: object) -> None:
-        """
-        Adds on element to the cache only if the cache exists for the user.
-
-        Note: This method is not atomic. So in very rare cases it is possible
-        that the restricted date cache can become corrupt. The best solution would be to
-        use a lua script instead. See also #3427.
-        """
-        if self.exists_for_user(user_id):
-            self.add_element(user_id, collection_string, id, data)
-
-    def add_element(self, user_id: int, collection_string: str, id: int, data: object) -> None:
-        """
-        Adds one element to the cache. If the cache does not exists for the user,
-        it is created.
-        """
-        redis = get_redis_connection()
-        redis.hset(
-            self.get_cache_key(user_id),
-            "{}/{}".format(collection_string, id),
-            json.dumps(data))
-
-    def del_element(self, user_id: int, collection_string: str, id: int) -> None:
-        """
-        Removes one element from the cache.
-
-        Does nothing if the cache does not exist.
-        """
-        redis = get_redis_connection()
-        redis.hdel(
-            self.get_cache_key(user_id),
-            "{}/{}".format(collection_string, id))
-
-    def del_user(self, user_id: int) -> None:
-        """
-        Removes all elements for one user from the cache.
-        """
-        redis = get_redis_connection()
-        redis.delete(self.get_cache_key(user_id))
-
-    def del_all(self) -> None:
-        """
-        Deletes all elements from the cache.
-
-        This method uses the redis command SCAN. See
-        https://redis.io/commands/scan#scan-guarantees for its limitations. If
-        an element is added to the cache while del_all() is in process, it is
-        possible, that it is not deleted.
-        """
-        redis = get_redis_connection()
-
-        # Get all keys that start with self.base_cache_key and delete them
-        match = cache.make_key('{}:*'.format(self.base_cache_key))
-        cursor = 0
-        while True:
-            cursor, keys = redis.scan(cursor, match)
-            for key in keys:
-                redis.delete(key)
-            if cursor == 0:
-                return
-
-    def exists_for_user(self, user_id: int) -> bool:
-        """
-        Returns True if the cache for the user exists, else False.
-        """
-        redis = get_redis_connection()
-        return redis.exists(self.get_cache_key(user_id))
-
-    def get_data(self, user_id: int) -> List[object]:
-        """
-        Returns all data for the user.
-
-        The returned value is a list of the elements.
-        """
-        redis = get_redis_connection()
-        return [json.loads(element.decode()) for element in redis.hvals(self.get_cache_key(user_id))]
-
-    def get_cache_key(self, user_id: int) -> str:
-        """
-        Returns the cache key for a user.
-        """
-        return cache.make_key('{}:{}'.format(self.base_cache_key, user_id))
-
-
-class DummyRestrictedDataCache:
-    """
-    Dummy RestrictedDataCache that does nothing.
-    """
-
-    def update_element(self, user_id: int, collection_string: str, id: int, data: object) -> None:
-        pass
-
-    def add_element(self, user_id: int, collection_string: str, id: int, data: object) -> None:
-        pass
-
-    def del_element(self, user_id: int, collection_string: str, id: int) -> None:
-        pass
-
-    def del_user(self, user_id: int) -> None:
-        pass
-
-    def del_all(self) -> None:
-        pass
-
-    def exists_for_user(self, user_id: int) -> bool:
-        return False
-
-    def get_data(self, user_id: int) -> List[object]:
-        pass
-
-
-def use_redis_cache() -> bool:
-    """
-    Returns True if Redis is used als caching backend.
-    """
-    try:
-        from django_redis.cache import RedisCache
-    except ImportError:
-        return False
-    return isinstance(caches['default'], RedisCache)
-
-
-def get_redis_connection() -> Any:
-    """
-    Returns an object that can be used to talk directly to redis.
-    """
-    from django_redis import get_redis_connection
-    return get_redis_connection("default")
-
-
-if use_redis_cache():
-    websocket_user_cache = RedisWebsocketUserCache()  # type: BaseWebsocketUserCache
-    if settings.DISABLE_USER_CACHE:
-        restricted_data_cache = DummyRestrictedDataCache()  # type: Union[RestrictedDataCache, DummyRestrictedDataCache]
-    else:
-        restricted_data_cache = RestrictedDataCache()
-    full_data_cache = FullDataCache()  # type: Union[FullDataCache, DummyFullDataCache]
-else:
-    websocket_user_cache = DjangoCacheWebsocketUserCache()
-    restricted_data_cache = DummyRestrictedDataCache()
-    full_data_cache = DummyFullDataCache()

openslides/utils/cache_providers.py

@@ -0,0 +1,508 @@
+from collections import defaultdict
+from typing import Set  # noqa
+from typing import (
+    TYPE_CHECKING,
+    Any,
+    Dict,
+    Generator,
+    Iterable,
+    List,
+    Optional,
+    Tuple,
+    Union,
+)
+
+from django.apps import apps
+
+from .utils import split_element_id, str_dict_to_bytes
+
+
+if TYPE_CHECKING:
+    # Dummy import Collection for mypy, can be fixed with python 3.7
+    from .collection import CollectionElement  # noqa
+
+try:
+    import aioredis
+except ImportError:
+    no_redis_dependency = True
+else:
+    no_redis_dependency = False
+
+
+class BaseCacheProvider:
+    """
+    Base class for cache provider.
+
+    See RedisCacheProvider as reverence implementation.
+    """
+    full_data_cache_key = 'full_data_cache'
+    restricted_user_cache_key = 'restricted_data_cache:{user_id}'
+    change_id_cache_key = 'change_id_cache'
+    lock_key = '_config:updating'
+
+    def __init__(self, *args: Any) -> None:
+        pass
+
+    def get_full_data_cache_key(self) -> str:
+        return self.full_data_cache_key
+
+    def get_restricted_data_cache_key(self, user_id: int) -> str:
+        return self.restricted_user_cache_key.format(user_id=user_id)
+
+    def get_change_id_cache_key(self) -> str:
+        return self.change_id_cache_key
+
+    def clear_cache(self) -> None:
+        raise NotImplementedError("CacheProvider has to implement the method clear_cache().")
+
+    async def reset_full_cache(self, data: Dict[str, str]) -> None:
+        raise NotImplementedError("CacheProvider has to implement the method reset_full_cache().")
+
+    async def data_exists(self, user_id: Optional[int] = None) -> bool:
+        raise NotImplementedError("CacheProvider has to implement the method exists_full_data().")
+
+    async def add_elements(self, elements: List[str]) -> None:
+        raise NotImplementedError("CacheProvider has to implement the method add_elements().")
+
+    async def del_elements(self, elements: List[str], user_id: Optional[int] = None) -> None:
+        raise NotImplementedError("CacheProvider has to implement the method del_elements().")
+
+    async def add_changed_elements(self, change_id: int, element_ids: Iterable[str]) -> None:
+        raise NotImplementedError("CacheProvider has to implement the method add_changed_elements().")
+
+    async def get_all_data(self, user_id: Optional[int] = None) -> Dict[bytes, bytes]:
+        raise NotImplementedError("CacheProvider has to implement the method get_all_data().")
+
+    async def get_data_since(self, change_id: int, user_id: Optional[int] = None) -> Tuple[Dict[str, List[bytes]], List[str]]:
+        raise NotImplementedError("CacheProvider has to implement the method get_data_since().")
+
+    async def get_element(self, element_id: str) -> Optional[bytes]:
+        raise NotImplementedError("CacheProvider has to implement the method get_element().")
+
+    async def del_restricted_data(self, user_id: int) -> None:
+        raise NotImplementedError("CacheProvider has to implement the method del_restricted_data().")
+
+    async def set_lock_restricted_data(self, user_id: int) -> bool:
+        raise NotImplementedError("CacheProvider has to implement the method set_lock_restricted_data().")
+
+    async def get_lock_restricted_data(self, user_id: int) -> bool:
+        raise NotImplementedError("CacheProvider has to implement the method get_lock_restricted_data().")
+
+    async def del_lock_restricted_data(self, user_id: int) -> None:
+        raise NotImplementedError("CacheProvider has to implement the method del_lock_restricted_data().")
+
+    async def get_change_id_user(self, user_id: int) -> Optional[int]:
+        raise NotImplementedError("CacheProvider has to implement the method get_change_id_user().")
+
+    async def update_restricted_data(self, user_id: int, data: Dict[str, str]) -> None:
+        raise NotImplementedError("CacheProvider has to implement the method update_restricted_data().")
+
+    async def get_current_change_id(self) -> List[Tuple[str, int]]:
+        raise NotImplementedError("CacheProvider has to implement the method get_current_change_id().")
+
+    async def get_lowest_change_id(self) -> Optional[int]:
+        raise NotImplementedError("CacheProvider has to implement the method get_lowest_change_id().")
+
+
+class RedisCacheProvider(BaseCacheProvider):
+    """
+    Cache provider that loads and saves the data to redis.
+    """
+    redis_pool = None  # type: Optional[aioredis.RedisConnection]
+
+    def __init__(self, redis: str) -> None:
+        self.redis_address = redis
+
+    async def get_connection(self) -> 'aioredis.RedisConnection':
+        """
+        Returns a redis connection.
+        """
+        if self.redis_pool is None:
+            self.redis_pool = await aioredis.create_redis_pool(self.redis_address)
+        return self.redis_pool
+
+    async def reset_full_cache(self, data: Dict[str, str]) -> None:
+        """
+        Deletes the cache and write new data in it.
+        """
+        # TODO: lua or transaction
+        redis = await self.get_connection()
+        await redis.delete(self.get_full_data_cache_key())
+        await redis.hmset_dict(self.get_full_data_cache_key(), data)
+
+    async def data_exists(self, user_id: Optional[int] = None) -> bool:
+        """
+        Returns True, when there is data in the cache.
+
+        If user_id is None, the method tests for full_data. If user_id is an int, it tests
+        for the restricted_data_cache for the user with the user_id. 0 is for anonymous.
+        """
+        redis = await self.get_connection()
+        if user_id is None:
+            cache_key = self.get_full_data_cache_key()
+        else:
+            cache_key = self.get_restricted_data_cache_key(user_id)
+        return await redis.exists(cache_key)
+
+    async def add_elements(self, elements: List[str]) -> None:
+        """
+        Add or change elements to the cache.
+
+        elements is a list with an even len. the odd values are the element_ids and the even
+        values are the elements. The elements have to be encoded, for example with json.
+        """
+        redis = await self.get_connection()
+        await redis.hmset(
+            self.get_full_data_cache_key(),
+            *elements)
+
+    async def del_elements(self, elements: List[str], user_id: Optional[int] = None) -> None:
+        """
+        Deletes elements from the cache.
+
+        elements has to be a list of element_ids.
+
+        If user_id is None, the elements are deleted from the full_data cache. If user_id is an
+        int, the elements are deleted one restricted_data_cache. 0 is for anonymous.
+        """
+        redis = await self.get_connection()
+        if user_id is None:
+            cache_key = self.get_full_data_cache_key()
+        else:
+            cache_key = self.get_restricted_data_cache_key(user_id)
+        await redis.hdel(
+            cache_key,
+            *elements)
+
+    async def add_changed_elements(self, change_id: int, element_ids: Iterable[str]) -> None:
+        """
+        Saves which elements are change with a change_id.
+
+        args has to be an even iterable. The odd values have to be a change id (int) and the
+        even values have to be element_ids.
+        """
+        def zadd_args(change_id: int) -> Generator[Union[int, str], None, None]:
+            """
+            Small helper to generates the arguments for the redis command zadd.
+            """
+            for element_id in element_ids:
+                yield change_id
+                yield element_id
+
+        redis = await self.get_connection()
+        await redis.zadd(self.get_change_id_cache_key(), *zadd_args(change_id))
+        # Saves the lowest_change_id if it does not exist
+        await redis.zadd(self.get_change_id_cache_key(), change_id, '_config:lowest_change_id', exist='ZSET_IF_NOT_EXIST')
+
+    async def get_all_data(self, user_id: Optional[int] = None) -> Dict[bytes, bytes]:
+        """
+        Returns all data from a cache.
+
+        if user_id is None, then the data is returned from the full_data_cache. If it is and
+        int, it is returned from a restricted_data_cache. 0 is for anonymous.
+        """
+        if user_id is None:
+            cache_key = self.get_full_data_cache_key()
+        else:
+            cache_key = self.get_restricted_data_cache_key(user_id)
+        redis = await self.get_connection()
+        return await redis.hgetall(cache_key)
+
+    async def get_element(self, element_id: str) -> Optional[bytes]:
+        """
+        Returns one element from the full_data_cache.
+
+        Returns None, when the element does not exist.
+        """
+        redis = await self.get_connection()
+        return await redis.hget(
+            self.get_full_data_cache_key(),
+            element_id)
+
+    async def get_data_since(self, change_id: int, user_id: Optional[int] = None) -> Tuple[Dict[str, List[bytes]], List[str]]:
+        """
+        Returns all elements since a change_id.
+
+        The returend value is a two element tuple. The first value is a dict the elements where
+        the key is the collection_string and the value a list of (json-) encoded elements. The
+        second element is a list of element_ids, that have been deleted since the change_id.
+
+        if user_id is None, the full_data is returned. If user_id is an int, the restricted_data
+        for an user is used. 0 is for the anonymous user.
+        """
+        # TODO: rewrite with lua to get all elements with one request
+        redis = await self.get_connection()
+        changed_elements = defaultdict(list)  # type: Dict[str, List[bytes]]
+        deleted_elements = []  # type: List[str]
+        for element_id in await redis.zrangebyscore(self.get_change_id_cache_key(), min=change_id):
+            if element_id.startswith(b'_config'):
+                continue
+            element_json = await redis.hget(self.get_full_data_cache_key(), element_id)  # Optional[bytes]
+            if element_json is None:
+                # The element is not in the cache. It has to be deleted.
+                deleted_elements.append(element_id)
+            else:
+                collection_string, id = split_element_id(element_id)
+                changed_elements[collection_string].append(element_json)
+        return changed_elements, deleted_elements
+
+    async def del_restricted_data(self, user_id: int) -> None:
+        """
+        Deletes all restricted_data for an user. 0 is for the anonymous user.
+        """
+        redis = await self.get_connection()
+        await redis.delete(self.get_restricted_data_cache_key(user_id))
+
+    async def set_lock_restricted_data(self, user_id: int) -> bool:
+        """
+        Tries to sets a lock for the restricted_data of an user.
+
+        Returns True when the lock could be set.
+
+        Returns False when the lock was already set.
+        """
+        redis = await self.get_connection()
+        return await redis.hsetnx(self.get_restricted_data_cache_key(user_id), self.lock_key, 1)
+
+    async def get_lock_restricted_data(self, user_id: int) -> bool:
+        """
+        Returns True, when the lock for the restricted_data of an user is set. Else False.
+        """
+        redis = await self.get_connection()
+        return await redis.hget(self.get_restricted_data_cache_key(user_id), self.lock_key)
+
+    async def del_lock_restricted_data(self, user_id: int) -> None:
+        """
+        Deletes the lock for the restricted_data of an user. Does nothing when the
+        lock is not set.
+        """
+        redis = await self.get_connection()
+        await redis.hdel(self.get_restricted_data_cache_key(user_id), self.lock_key)
+
+    async def get_change_id_user(self, user_id: int) -> Optional[int]:
+        """
+        Get the change_id for the restricted_data of an user.
+
+        This is the change_id where the restricted_data was last calculated.
+        """
+        redis = await self.get_connection()
+        return await redis.hget(self.get_restricted_data_cache_key(user_id), '_config:change_id')
+
+    async def update_restricted_data(self, user_id: int, data: Dict[str, str]) -> None:
+        """
+        Updates the restricted_data for an user.
+
+        data has to be a dict where the key is an element_id and the value the (json-) encoded
+        element.
+        """
+        redis = await self.get_connection()
+        await redis.hmset_dict(self.get_restricted_data_cache_key(user_id), data)
+
+    async def get_current_change_id(self) -> List[Tuple[str, int]]:
+        """
+        Get the highest change_id from redis.
+        """
+        redis = await self.get_connection()
+        return await redis.zrevrangebyscore(
+            self.get_change_id_cache_key(),
+            withscores=True,
+            count=1,
+            offset=0)
+
+    async def get_lowest_change_id(self) -> Optional[int]:
+        """
+        Get the lowest change_id from redis.
+
+        Returns None if lowest score does not exist.
+        """
+        redis = await self.get_connection()
+        return await redis.zscore(
+            self.get_change_id_cache_key(),
+            '_config:lowest_change_id')
+
+
+class MemmoryCacheProvider(BaseCacheProvider):
+    """
+    CacheProvider for the ElementCache that uses only the memory.
+
+    See the RedisCacheProvider for a description of the methods.
+
+    This provider supports only one process. It saves the data into the memory.
+    When you use different processes they will use diffrent data.
+    """
+
+    def __init__(self, *args: Any, **kwargs: Any) -> None:
+        self.clear_cache()
+
+    def clear_cache(self) -> None:
+        self.full_data = {}  # type: Dict[str, str]
+        self.restricted_data = {}  # type: Dict[int, Dict[str, str]]
+        self.change_id_data = {}  # type: Dict[int, Set[str]]
+
+    async def reset_full_cache(self, data: Dict[str, str]) -> None:
+        self.full_data = data
+
+    async def data_exists(self, user_id: Optional[int] = None) -> bool:
+        if user_id is None:
+            cache_dict = self.full_data
+        else:
+            cache_dict = self.restricted_data.get(user_id, {})
+
+        return bool(cache_dict)
+
+    async def add_elements(self, elements: List[str]) -> None:
+        if len(elements) % 2:
+            raise ValueError("The argument elements of add_elements has to be a list with an even number of elements.")
+
+        for i in range(0, len(elements), 2):
+            self.full_data[elements[i]] = elements[i+1]
+
+    async def del_elements(self, elements: List[str], user_id: Optional[int] = None) -> None:
+        if user_id is None:
+            cache_dict = self.full_data
+        else:
+            cache_dict = self.restricted_data.get(user_id, {})
+
+        for element in elements:
+            try:
+                del cache_dict[element]
+            except KeyError:
+                pass
+
+    async def add_changed_elements(self, change_id: int, element_ids: Iterable[str]) -> None:
+        element_ids = list(element_ids)
+
+        for element_id in element_ids:
+            if change_id in self.change_id_data:
+                self.change_id_data[change_id].add(element_id)
+            else:
+                self.change_id_data[change_id] = {element_id}
+
+    async def get_all_data(self, user_id: Optional[int] = None) -> Dict[bytes, bytes]:
+        if user_id is None:
+            cache_dict = self.full_data
+        else:
+            cache_dict = self.restricted_data.get(user_id, {})
+
+        return str_dict_to_bytes(cache_dict)
+
+    async def get_element(self, element_id: str) -> Optional[bytes]:
+        value = self.full_data.get(element_id, None)
+        return value.encode() if value is not None else None
+
+    async def get_data_since(
+            self, change_id: int, user_id: Optional[int] = None) -> Tuple[Dict[str, List[bytes]], List[str]]:
+        changed_elements = defaultdict(list)  # type: Dict[str, List[bytes]]
+        deleted_elements = []  # type: List[str]
+        if user_id is None:
+            cache_dict = self.full_data
+        else:
+            cache_dict = self.restricted_data.get(user_id, {})
+
+        for data_change_id, element_ids in self.change_id_data.items():
+            if data_change_id < change_id:
+                continue
+            for element_id in element_ids:
+                element_json = cache_dict.get(element_id, None)
+                if element_json is None:
+                    deleted_elements.append(element_id)
+                else:
+                    collection_string, id = split_element_id(element_id)
+                    changed_elements[collection_string].append(element_json.encode())
+        return changed_elements, deleted_elements
+
+    async def del_restricted_data(self, user_id: int) -> None:
+        try:
+            del self.restricted_data[user_id]
+        except KeyError:
+            pass
+
+    async def set_lock_restricted_data(self, user_id: int) -> bool:
+        data = self.restricted_data.setdefault(user_id, {})
+        if self.lock_key in data:
+            return False
+        data[self.lock_key] = "1"
+        return True
+
+    async def get_lock_restricted_data(self, user_id: int) -> bool:
+        data = self.restricted_data.get(user_id, {})
+        return self.lock_key in data
+
+    async def del_lock_restricted_data(self, user_id: int) -> None:
+        data = self.restricted_data.get(user_id, {})
+        try:
+            del data[self.lock_key]
+        except KeyError:
+            pass
+
+    async def get_change_id_user(self, user_id: int) -> Optional[int]:
+        data = self.restricted_data.get(user_id, {})
+        change_id = data.get('_config:change_id', None)
+        return int(change_id) if change_id is not None else None
+
+    async def update_restricted_data(self, user_id: int, data: Dict[str, str]) -> None:
+        redis_data = self.restricted_data.setdefault(user_id, {})
+        redis_data.update(data)
+
+    async def get_current_change_id(self) -> List[Tuple[str, int]]:
+        change_data = self.change_id_data
+        if change_data:
+            return [('no_usefull_value', max(change_data.keys()))]
+        return []
+
+    async def get_lowest_change_id(self) -> Optional[int]:
+        change_data = self.change_id_data
+        if change_data:
+            return min(change_data.keys())
+        return None
+
+
+class Cachable:
+    """
+    A Cachable is an object that returns elements that can be cached.
+
+    It needs at least the methods defined here.
+    """
+
+    def get_collection_string(self) -> str:
+        """
+        Returns the string representing the name of the cachable.
+        """
+        raise NotImplementedError("Cachable has to implement the method get_collection_string().")
+
+    def get_elements(self) -> List[Dict[str, Any]]:
+        """
+        Returns all elements of the cachable.
+        """
+        raise NotImplementedError("Cachable has to implement the method get_collection_string().")
+
+    def restrict_elements(
+            self,
+            user: Optional['CollectionElement'],
+            elements: List[Dict[str, Any]]) -> List[Dict[str, Any]]:
+        """
+        Converts full_data to restricted_data.
+
+        elements can be an empty list, a list with some elements of the cachable or with all
+        elements of the cachable.
+
+        The default implementation returns the full_data.
+        """
+        return elements
+
+
+def get_all_cachables() -> List[Cachable]:
+    """
+    Returns all element of OpenSlides.
+    """
+    out = []  # type: List[Cachable]
+    for app in apps.get_app_configs():
+        try:
+            # Get the method get_startup_elements() from an app.
+            # This method has to return an iterable of Collection objects.
+            get_startup_elements = app.get_startup_elements
+        except AttributeError:
+            # Skip apps that do not implement get_startup_elements.
+            continue
+        out.extend(get_startup_elements())
+    return out

openslides/utils/collection.py

@@ -10,11 +10,15 @@ from typing import (
     cast,
 )
 
+from asgiref.sync import async_to_sync
 from django.apps import apps
+from django.conf import settings
 from django.db.models import Model
 from mypy_extensions import TypedDict
 
-from .cache import full_data_cache
+from .cache import element_cache
+from .cache_providers import Cachable
+
 
 if TYPE_CHECKING:
     from .access_permissions import BaseAccessPermissions  # noqa
@@ -74,19 +78,12 @@ class CollectionElement:
                 'CollectionElement.from_values() but not CollectionElement() '
                 'directly.')
 
-        if self.is_deleted():
+        if not self.deleted:
-            # Delete the element from the cache, if self.is_deleted() is True:
+            self.get_full_data()  # This raises DoesNotExist, if the element does not exist.
-            full_data_cache.del_element(self.collection_string, self.id)
-        else:
-            # The call to get_full_data() has some sideeffects. When the object
-            # was created with from_instance() or the object is not in the cache
-            # then get_full_data() will save the object into the cache.
-            # This will also raise a DoesNotExist error, if the object does
-            # neither exist in the cache nor in the database.
-            self.get_full_data()
 
     @classmethod
-    def from_instance(cls, instance: Model, deleted: bool = False, information: Dict[str, Any] = None) -> 'CollectionElement':
+    def from_instance(
+            cls, instance: Model, deleted: bool = False, information: Dict[str, Any] = None) -> 'CollectionElement':
         """
         Returns a collection element from a database instance.
 
@@ -175,6 +172,20 @@ class CollectionElement:
         """
         return self.get_model().get_access_permissions()
 
+    def get_element_from_db(self) -> Optional[Dict[str, Any]]:
+        # Hack for django 2.0 and channels 2.1 to stay in the same thread.
+        # This is needed for the tests.
+        try:
+            query = self.get_model().objects.get_full_queryset()
+        except AttributeError:
+            # If the model des not have to method get_full_queryset(), then use
+            # the default queryset from django.
+            query = self.get_model().objects
+        try:
+            return self.get_access_permissions().get_full_data(query.get(pk=self.id))
+        except self.get_model().DoesNotExist:
+            return None
+
     def get_full_data(self) -> Dict[str, Any]:
         """
         Returns the full_data of this collection_element from with all other
@@ -188,14 +199,20 @@ class CollectionElement:
         # else: use the cache.
         if self.full_data is None:
             if self.instance is None:
-                # Make sure the cache exists
+                # The type of data has to be set for mypy
-                if not full_data_cache.exists_for_collection(self.collection_string):
+                data = None  # type: Optional[Dict[str, Any]]
-                    # Build the cache if it does not exists.
+                if getattr(settings, 'SKIP_CACHE', False):
-                    full_data_cache.build_for_collection(self.collection_string)
+                    # Hack for django 2.0 and channels 2.1 to stay in the same thread.
-                self.full_data = full_data_cache.get_element(self.collection_string, self.id)
+                    # This is needed for the tests.
+                    data = self.get_element_from_db()
+                else:
+                    data = async_to_sync(element_cache.get_element_full_data)(self.collection_string, self.id)
+                if data is None:
+                    raise self.get_model().DoesNotExist(
+                        "Collection {} with id {} does not exist".format(self.collection_string, self.id))
+                self.full_data = data
             else:
                 self.full_data = self.get_access_permissions().get_full_data(self.instance)
-                full_data_cache.add_element(self.collection_string, self.id, self.full_data)
         return self.full_data
 
     def is_deleted(self) -> bool:
@@ -205,7 +222,7 @@ class CollectionElement:
         return self.deleted
 
 
-class Collection:
+class Collection(Cachable):
     """
     Represents all elements of one collection.
     """
@@ -242,17 +259,32 @@ class Collection:
                 full_data['id'],
                 full_data=full_data)
 
+    def get_elements_from_db(self) ->Dict[str, List[Dict[str, Any]]]:
+        # Hack for django 2.0 and channels 2.1 to stay in the same thread.
+        # This is needed for the tests.
+        try:
+            query = self.get_model().objects.get_full_queryset()
+        except AttributeError:
+            # If the model des not have to method get_full_queryset(), then use
+            # the default queryset from django.
+            query = self.get_model().objects
+        return {self.collection_string: [self.get_model().get_access_permissions().get_full_data(instance) for instance in query.all()]}
+
     def get_full_data(self) -> List[Dict[str, Any]]:
         """
         Returns a list of dictionaries with full_data of all collection
         elements.
         """
         if self.full_data is None:
-            # Build the cache, if it does not exists.
+            # The type of all_full_data has to be set for mypy
-            if not full_data_cache.exists_for_collection(self.collection_string):
+            all_full_data = {}  # type: Dict[str, List[Dict[str, Any]]]
-                full_data_cache.build_for_collection(self.collection_string)
+            if getattr(settings, 'SKIP_CACHE', False):
-
+                # Hack for django 2.0 and channels 2.1 to stay in the same thread.
-            self.full_data = full_data_cache.get_data(self.collection_string)
+                # This is needed for the tests.
+                all_full_data = self.get_elements_from_db()
+            else:
+                all_full_data = async_to_sync(element_cache.get_all_full_data)()
+            self.full_data = all_full_data[self.collection_string]
         return self.full_data
 
     def as_list_for_user(self, user: Optional[CollectionElement]) -> List[Dict[str, Any]]:
@@ -262,6 +294,27 @@ class Collection:
         """
         return self.get_access_permissions().get_restricted_data(self.get_full_data(), user)
 
+    def get_collection_string(self) -> str:
+        """
+        Returns the collection_string.
+        """
+        return self.collection_string
+
+    def get_elements(self) -> List[Dict[str, Any]]:
+        """
+        Returns all elements of the Collection as full_data.
+        """
+        return self.get_full_data()
+
+    def restrict_elements(
+            self,
+            user: Optional['CollectionElement'],
+            elements: List[Dict[str, Any]]) -> List[Dict[str, Any]]:
+        """
+        Converts the full_data to restricted data.
+        """
+        return self.get_model().get_access_permissions().get_restricted_data(user, elements)
+
 
 _models_to_collection_string = {}  # type: Dict[str, Type[Model]]
 
@@ -295,7 +348,8 @@ def get_model_from_collection_string(collection_string: str) -> Type[Model]:
     return model
 
 
-def format_for_autoupdate(collection_string: str, id: int, action: str, data: Dict[str, Any] = None) -> AutoupdateFormat:
+def format_for_autoupdate(
+        collection_string: str, id: int, action: str, data: Dict[str, Any] = None) -> AutoupdateFormat:
     """
     Returns a dict that can be used for autoupdate.
     """

openslides/utils/consumers.py

@@ -0,0 +1,306 @@
+from typing import Any, Dict, List, Optional
+
+from asgiref.sync import sync_to_async
+from channels.db import database_sync_to_async
+from channels.generic.websocket import AsyncJsonWebsocketConsumer
+
+from ..core.config import config
+from ..core.models import Projector
+from .auth import async_anonymous_is_enabled, has_perm
+from .cache import element_cache, split_element_id
+from .collection import AutoupdateFormat  # noqa
+from .collection import (
+    Collection,
+    CollectionElement,
+    format_for_autoupdate,
+    from_channel_message,
+)
+
+
+class SiteConsumer(AsyncJsonWebsocketConsumer):
+    """
+    Websocket Consumer for the site.
+    """
+    groups = ['site']
+
+    async def connect(self) -> None:
+        """
+        A user connects to the site.
+
+        If it is an anonymous user and anonymous is disabled, the connection is closed.
+
+        Sends the startup data to the user.
+        """
+        # TODO: add a way to ask for the data since a change_id and send only data that is newer
+        if not await async_anonymous_is_enabled() and self.scope['user'].id is None:
+            await self.close()
+        else:
+            await self.accept()
+            data = await startup_data(self.scope['user'])
+            await self.send_json(data)
+
+    async def receive_json(self, content: Any) -> None:
+        """
+        If we recieve something from the client we currently just interpret this
+        as a notify message.
+
+        The server adds the sender's user id (0 for anonymous) and reply
+        channel name so that a receiver client may reply to the sender or to all
+        sender's instances.
+        """
+        if notify_message_is_valid(content):
+            await self.channel_layer.group_send(
+                "projector",
+                {
+                    "type": "send_notify",
+                    "incomming": content,
+                    "senderReplyChannelName": self.channel_name,
+                    "senderUserId": self.scope['user'].id or 0,
+                },
+            )
+            await self.channel_layer.group_send(
+                "site",
+                {
+                    "type": "send_notify",
+                    "incomming": content,
+                    "senderReplyChannelName": self.channel_name,
+                    "senderUserId": self.scope['user'].id or 0,
+                },
+            )
+        else:
+            await self.send_json({'error': 'invalid message'})
+
+    async def send_notify(self, event: Dict[str, Any]) -> None:
+        """
+        Send a notify message to the user.
+        """
+        user_id = self.scope['user'].id or 0
+
+        out = []
+        for item in event['incomming']:
+            users = item.get('users')
+            reply_channels = item.get('replyChannels')
+            projectors = item.get('projectors')
+            if ((isinstance(users, list) and user_id in users)
+                    or (isinstance(reply_channels, list) and self.channel_name in reply_channels)
+                    or (users is None and reply_channels is None and projectors is None)):
+                item['senderReplyChannelName'] = event.get('senderReplyChannelName')
+                item['senderUserId'] = event.get('senderUserId')
+                item['senderProjectorId'] = event.get('senderProjectorId')
+                out.append(item)
+
+        if out:
+            await self.send_json(out)
+
+    async def send_data(self, event: Dict[str, Any]) -> None:
+        """
+        Send changed or deleted elements to the user.
+        """
+        change_id = event['change_id']
+        output = []
+        changed_elements, deleted_elements = await element_cache.get_restricted_data(self.scope['user'], change_id)
+        for collection_string, elements in changed_elements.items():
+            for element in elements:
+                output.append(format_for_autoupdate(
+                    collection_string=collection_string,
+                    id=element['id'],
+                    action='changed',
+                    data=element))
+        for element_id in deleted_elements:
+            collection_string, id = split_element_id(element_id)
+            output.append(format_for_autoupdate(
+                collection_string=collection_string,
+                id=id,
+                action='deleted'))
+        await self.send_json(output)
+
+
+class ProjectorConsumer(AsyncJsonWebsocketConsumer):
+    """
+    Websocket Consumer for the projector.
+    """
+
+    groups = ['projector']
+
+    async def connect(self) -> None:
+        """
+        Adds the websocket connection to a group specific to the projector with the given id.
+        Also sends all data that are shown on the projector.
+        """
+        user = self.scope['user']
+        projector_id = self.scope["url_route"]["kwargs"]["projector_id"]
+        await self.accept()
+
+        if not await database_sync_to_async(has_perm)(user, 'core.can_see_projector'):
+            await self.send_json({'text': 'No permissions to see this projector.'})
+            # TODO: Shouldend we just close the websocket connection with an error message?
+            #       self.close(code=4403)
+        else:
+            out = await sync_to_async(projector_startup_data)(projector_id)
+            await self.send_json(out)
+
+    async def receive_json(self, content: Any) -> None:
+        """
+        If we recieve something from the client we currently just interpret this
+        as a notify message.
+
+        The server adds the sender's user id (0 for anonymous) and reply
+        channel name so that a receiver client may reply to the sender or to all
+        sender's instances.
+        """
+        projector_id = self.scope["url_route"]["kwargs"]["projector_id"]
+        await self.channel_layer.group_send(
+            "projector",
+            {
+                "type": "send_notify",
+                "incomming": content,
+                "senderReplyChannelName": self.channel_name,
+                "senderProjectorId": projector_id,
+            },
+        )
+        await self.channel_layer.group_send(
+            "site",
+            {
+                "type": "send_notify",
+                "incomming": content,
+                "senderReplyChannelName": self.channel_name,
+                "senderProjectorId": projector_id,
+            },
+        )
+
+    async def send_notify(self, event: Dict[str, Any]) -> None:
+        """
+        Send a notify message to the projector.
+        """
+        projector_id = self.scope["url_route"]["kwargs"]["projector_id"]
+
+        out = []
+        for item in event['incomming']:
+            users = item.get('users')
+            reply_channels = item.get('replyChannels')
+            projectors = item.get('projectors')
+            if ((isinstance(projectors, list) and projector_id in projectors)
+                    or (isinstance(reply_channels, list) and self.channel_name in reply_channels)
+                    or (users is None and reply_channels is None and projectors is None)):
+                item['senderReplyChannelName'] = event.get('senderReplyChannelName')
+                item['senderUserId'] = event.get('senderUserId')
+                item['senderProjectorId'] = event.get('senderProjectorId')
+                out.append(item)
+
+        if out:
+            await self.send_json(out)
+
+    async def send_data(self, event: Dict[str, Any]) -> None:
+        """
+        Informs all projector clients about changed data.
+        """
+        projector_id = self.scope["url_route"]["kwargs"]["projector_id"]
+        collection_elements = from_channel_message(event['message'])
+
+        output = await projector_sync_send_data(projector_id, collection_elements)
+        if output:
+            await self.send_json(output)
+
+
+async def startup_data(user: Optional[CollectionElement], change_id: int = 0) -> List[Any]:
+    """
+    Returns all data for startup.
+    """
+    # TODO: use the change_id argument
+    output = []
+    restricted_data = await element_cache.get_all_restricted_data(user)
+    for collection_string, elements in restricted_data.items():
+        for element in elements:
+            formatted_data = format_for_autoupdate(
+                collection_string=collection_string,
+                id=element['id'],
+                action='changed',
+                data=element)
+
+            output.append(formatted_data)
+    return output
+
+
+def projector_startup_data(projector_id: int) -> Any:
+    """
+    Generate the startup data for a projector.
+    """
+    try:
+        projector = Projector.objects.get(pk=projector_id)
+    except Projector.DoesNotExist:
+        return {'text': 'The projector {} does not exist.'.format(projector_id)}
+    else:
+        # Now check whether broadcast is active at the moment. If yes,
+        # change the local projector variable.
+        if config['projector_broadcast'] > 0:
+            projector = Projector.objects.get(pk=config['projector_broadcast'])
+
+        # Collect all elements that are on the projector.
+        output = []  # type: List[AutoupdateFormat]
+        for requirement in projector.get_all_requirements():
+            required_collection_element = CollectionElement.from_instance(requirement)
+            output.append(required_collection_element.as_autoupdate_for_projector())
+
+        # Collect all config elements.
+        config_collection = Collection(config.get_collection_string())
+        projector_data = (config_collection.get_access_permissions()
+                          .get_projector_data(config_collection.get_full_data()))
+        for data in projector_data:
+            output.append(format_for_autoupdate(
+                config_collection.collection_string,
+                data['id'],
+                'changed',
+                data))
+
+        # Collect the projector instance.
+        collection_element = CollectionElement.from_instance(projector)
+        output.append(collection_element.as_autoupdate_for_projector())
+
+        # Send all the data that were only collected before.
+        return output
+
+
+@sync_to_async
+def projector_sync_send_data(projector_id: int, collection_elements: List[CollectionElement]) -> List[Any]:
+    """
+    sync function that generates the elements for an projector.
+    """
+    # Load the projector object. If broadcast is on, use the broadcast projector
+    # instead.
+    if config['projector_broadcast'] > 0:
+        projector_id = config['projector_broadcast']
+
+    projector = Projector.objects.get(pk=projector_id)
+
+    # TODO: This runs once for every open projector tab. Either use
+    #       caching or something else, so this is only called once
+    output = []
+    for collection_element in collection_elements:
+        if collection_element.is_deleted():
+            output.append(collection_element.as_autoupdate_for_projector())
+        else:
+            for element in projector.get_collection_elements_required_for_this(collection_element):
+                output.append(element.as_autoupdate_for_projector())
+    return output
+
+
+def notify_message_is_valid(message: object) -> bool:
+    """
+    Returns True, when the message is a valid notify_message.
+    """
+    if not isinstance(message, list):
+        # message has to be a list
+        return False
+
+    if not message:
+        # message must contain at least one element
+        return False
+
+    for element in message:
+        if not isinstance(element, dict):
+            # All elements have to be a dict
+            return False
+    # TODO: There could be more checks. For example 'users' has to be a list of int
+    #       Check could be done with json-schema:
+    #       https://pypi.org/project/jsonschema/
+    return True

openslides/utils/main.py

@@ -13,6 +13,7 @@ from django.core.exceptions import ImproperlyConfigured
 from django.utils.crypto import get_random_string
 from mypy_extensions import NoReturn
 
+
 DEVELOPMENT_VERSION = 'Development Version'
 UNIX_VERSION = 'Unix Version'
 WINDOWS_VERSION = 'Windows Version'
@@ -327,16 +328,6 @@ def is_local_installation() -> bool:
     return True if '--local-installation' in sys.argv or 'manage.py' in sys.argv[0] else False
 
 
-def get_geiss_path() -> str:
-    """
-    Returns the path and file to the Geiss binary.
-    """
-    from django.conf import settings
-    download_dir = getattr(settings, 'OPENSLIDES_USER_DATA_PATH', '')
-    bin_name = 'geiss.exe' if is_windows() else 'geiss'
-    return os.path.join(download_dir, bin_name)
-
-
 def is_windows() -> bool:
     """
     Returns True if the current system is Windows. Returns False otherwise.

openslides/utils/middleware.py

@@ -0,0 +1,63 @@
+from typing import Any, Dict, Union
+
+from channels.auth import (
+    AuthMiddleware,
+    CookieMiddleware,
+    SessionMiddleware,
+    _get_user_session_key,
+)
+from django.conf import settings
+from django.contrib.auth import BACKEND_SESSION_KEY, HASH_SESSION_KEY
+from django.contrib.auth.models import AnonymousUser
+from django.utils.crypto import constant_time_compare
+
+from .cache import element_cache
+from .collection import CollectionElement
+
+
+class CollectionAuthMiddleware(AuthMiddleware):
+    """
+    Like the channels AuthMiddleware but returns a CollectionElement instead of
+    a django Model as user.
+    """
+
+    async def resolve_scope(self, scope: Dict[str, Any]) -> None:
+        scope["user"]._wrapped = await get_user(scope)
+
+
+async def get_user(scope: Dict[str, Any]) -> Union[CollectionElement, AnonymousUser]:
+    """
+    Returns a User-CollectionElement from a channels-scope-session.
+
+    If no user is retrieved, return AnonymousUser.
+    """
+    # This can not return None because a LazyObject can not become None
+
+    # This code is basicly from channels.auth:
+    # https://github.com/django/channels/blob/d5e81a78e96770127da79248349808b6ee6ec2a7/channels/auth.py#L16
+    if "session" not in scope:
+        raise ValueError("Cannot find session in scope. You should wrap your consumer in SessionMiddleware.")
+    session = scope["session"]
+    user = None
+    try:
+        user_id = _get_user_session_key(session)
+        backend_path = session[BACKEND_SESSION_KEY]
+    except KeyError:
+        pass
+    else:
+        if backend_path in settings.AUTHENTICATION_BACKENDS:
+            user = await element_cache.get_element_full_data("users/user", user_id)
+            if user is not None:
+                # Verify the session
+                session_hash = session.get(HASH_SESSION_KEY)
+                session_hash_verified = session_hash and constant_time_compare(
+                    session_hash,
+                    user['session_auth_hash'])
+                if not session_hash_verified:
+                    session.flush()
+                    user = None
+    return CollectionElement.from_values("users/user", user_id, full_data=user) if user else AnonymousUser()
+
+
+# Handy shortcut for applying all three layers at once
+AuthMiddlewareStack = lambda inner: CookieMiddleware(SessionMiddleware(CollectionAuthMiddleware(inner)))  # noqa

openslides/utils/migrations.py

@@ -1,4 +1,4 @@
-from typing import Any, Callable  # noqa
+from typing import Any, Callable
 
 from django.contrib.auth.models import Permission
 from django.contrib.contenttypes.models import ContentType

openslides/utils/models.py

@@ -1,12 +1,17 @@
-from typing import Any, Dict
+from typing import TYPE_CHECKING, Any, Dict, List, Optional
 
 from django.core.exceptions import ImproperlyConfigured
 from django.db import models
 
-from .access_permissions import BaseAccessPermissions  # noqa
+from .access_permissions import BaseAccessPermissions
 from .utils import convert_camel_case_to_pseudo_snake_case
 
 
+if TYPE_CHECKING:
+    # Dummy import Collection for mypy, can be fixed with python 3.7
+    from .collection import Collection, CollectionElement  # noqa
+
+
 class MinMaxIntegerField(models.IntegerField):
     """
     IntegerField with options to set a min- and a max-value.
@@ -117,3 +122,29 @@ class RESTModelMixin:
             else:
                 inform_deleted_data([(self.get_collection_string(), instance_pk)], information=information)
         return return_value
+
+    @classmethod
+    def get_elements(cls) -> List[Dict[str, Any]]:
+        """
+        Returns all elements as full_data.
+        """
+        # Get the query to receive all data from the database.
+        try:
+            query = cls.objects.get_full_queryset()  # type: ignore
+        except AttributeError:
+            # If the model des not have to method get_full_queryset(), then use
+            # the default queryset from django.
+            query = cls.objects  # type: ignore
+
+        # Build a dict from the instance id to the full_data
+        return [cls.get_access_permissions().get_full_data(instance) for instance in query.all()]
+
+    @classmethod
+    def restrict_elements(
+            cls,
+            user: Optional['CollectionElement'],
+            elements: List[Dict[str, Any]]) -> List[Dict[str, Any]]:
+        """
+        Converts a list of elements from full_data to restricted_data.
+        """
+        return cls.get_access_permissions().get_restricted_data(elements, user)

openslides/utils/rest_api.py

@@ -5,17 +5,16 @@ from django.http import Http404
 from rest_framework import status  # noqa
 from rest_framework.decorators import detail_route, list_route  # noqa
 from rest_framework.metadata import SimpleMetadata  # noqa
-from rest_framework.mixins import ListModelMixin as _ListModelMixin
-from rest_framework.mixins import RetrieveModelMixin as _RetrieveModelMixin
 from rest_framework.mixins import (  # noqa
     CreateModelMixin,
     DestroyModelMixin,
+    ListModelMixin as _ListModelMixin,
+    RetrieveModelMixin as _RetrieveModelMixin,
     UpdateModelMixin,
 )
 from rest_framework.relations import MANY_RELATION_KWARGS
 from rest_framework.response import Response
 from rest_framework.routers import DefaultRouter
-from rest_framework.serializers import ModelSerializer as _ModelSerializer
 from rest_framework.serializers import (  # noqa
     CharField,
     DictField,
@@ -26,20 +25,24 @@ from rest_framework.serializers import (  # noqa
     ListField,
     ListSerializer,
     ManyRelatedField,
+    ModelSerializer as _ModelSerializer,
     PrimaryKeyRelatedField,
     RelatedField,
     Serializer,
     SerializerMethodField,
     ValidationError,
 )
-from rest_framework.viewsets import GenericViewSet as _GenericViewSet  # noqa
+from rest_framework.viewsets import (  # noqa
-from rest_framework.viewsets import ModelViewSet as _ModelViewSet  # noqa
+    GenericViewSet as _GenericViewSet,
-from rest_framework.viewsets import ViewSet as _ViewSet  # noqa
+    ModelViewSet as _ModelViewSet,
+    ViewSet as _ViewSet,
+)
 
 from .access_permissions import BaseAccessPermissions
 from .auth import user_to_collection_user
 from .collection import Collection, CollectionElement
 
+
 router = DefaultRouter()
 
 

openslides/utils/settings.py.tpl

@@ -79,59 +79,38 @@ DATABASES = {
 use_redis = False
 
 if use_redis:
-    # Redis configuration for django-redis-session. Keep this synchronized to
+    # Django Channels
-    # the caching settings
 
+    # https://channels.readthedocs.io/en/latest/topics/channel_layers.html#configuration
+
+    CHANNEL_LAYERS['default']['BACKEND'] = 'channels_redis.core.RedisChannelLayer'
+    CHANNEL_LAYERS['default']['CONFIG'] = {"capacity": 100000}
+
+    # Collection Cache
+
+    # Can be:
+    # a Redis URI — "redis://host:6379/0?encoding=utf-8";
+    # a (host, port) tuple — ('localhost', 6379);
+    # or a unix domain socket path string — "/path/to/redis.sock".
+    REDIS_ADDRESS = "redis://127.0.0.1"
+
+    # When use_redis is True, the restricted data cache caches the data individuel
+    # for each user. This requires a lot of memory if there are a lot of active
+    # users.
+    RESTRICTED_DATA_CACHE = True
+
+    # Session backend
+
+    # Redis configuration for django-redis-sessions.
+    # https://github.com/martinrusev/django-redis-sessions
+
+    SESSION_ENGINE = 'redis_sessions.session'
     SESSION_REDIS = {
         'host': '127.0.0.1',
         'post': 6379,
         'db': 0,
     }
 
-    # Django Channels
-
-    # Unless you have only a small assembly uncomment the following lines to
-    # activate Redis as backend for Django Channels and Cache. You have to install
-    # a Redis server and the python packages asgi_redis and django-redis.
-
-    # https://channels.readthedocs.io/en/latest/backends.html#redis
-
-    CHANNEL_LAYERS['default']['BACKEND'] = 'asgi_redis.RedisChannelLayer'
-    CHANNEL_LAYERS['default']['CONFIG']['prefix'] = 'asgi:'
-
-
-    # Caching
-
-    # Django uses a inmemory cache at default. This supports only one thread. If
-    # you use more then one thread another caching backend is required. We recommand
-    # django-redis: https://niwinz.github.io/django-redis/latest/#_user_guide
-
-    CACHES = {
-       "default": {
-           "BACKEND": "django_redis.cache.RedisCache",
-           "LOCATION": "redis://127.0.0.1:6379/0",
-           "OPTIONS": {
-               "CLIENT_CLASS": "django_redis.client.DefaultClient",
-           },
-           "KEY_PREFIX": "openslides-cache",
-       }
-    }
-
-    # Session backend
-
-    # Per default django uses the database as session backend. This can be slow.
-    # One possibility is to use the cache session backend with redis as cache backend
-    # Another possibility is to use a native redis session backend. For example:
-    # https://github.com/martinrusev/django-redis-sessions
-
-    # SESSION_ENGINE = 'django.contrib.sessions.backends.cache'
-    SESSION_ENGINE = 'redis_sessions.session'
-
-
-# When use_redis is True, the restricted data cache caches the data individuel
-# for each user. This requires a lot of memory if there are a lot of active
-# users. If use_redis is False, this setting has no effect.
-DISABLE_USER_CACHE = False
 
 # Internationalization
 # https://docs.djangoproject.com/en/1.10/topics/i18n/

openslides/utils/test.py

@@ -1,37 +1,12 @@
 from django.test import TestCase as _TestCase
-from django.test.runner import DiscoverRunner
 
 from ..core.config import config
 
 
-class OpenSlidesDiscoverRunner(DiscoverRunner):
-    def run_tests(self, test_labels, extra_tests=None, **kwargs):  # type: ignore
-        """
-        Test Runner which does not create a database, if only unittest are run.
-        """
-        if len(test_labels) == 1 and test_labels[0].startswith('tests.unit'):
-            # Do not create a test database, if only unittests are tested
-            create_database = False
-        else:
-            create_database = True
-
-        self.setup_test_environment()
-        suite = self.build_suite(test_labels, extra_tests)
-        if create_database:
-            old_config = self.setup_databases()
-        result = self.run_suite(suite)
-        if create_database:
-            self.teardown_databases(old_config)
-        self.teardown_test_environment()
-        return self.suite_result(suite, result)
-
-
 class TestCase(_TestCase):
     """
     Resets the config object after each test.
     """
 
     def tearDown(self) -> None:
-        from django_redis import get_redis_connection
+        config.save_default_values()
-        config.key_to_id = {}
-        get_redis_connection("default").flushall()

openslides/utils/utils.py

@@ -1,7 +1,13 @@
 import re
+from typing import TYPE_CHECKING, Dict, Optional, Tuple, Union
 
 import roman
 
+
+if TYPE_CHECKING:
+    # Dummy import Collection for mypy, can be fixed with python 3.7
+    from .collection import Collection, CollectionElement  # noqa
+
 CAMEL_CASE_TO_PSEUDO_SNAKE_CASE_CONVERSION_REGEX_1 = re.compile('(.)([A-Z][a-z]+)')
 CAMEL_CASE_TO_PSEUDO_SNAKE_CASE_CONVERSION_REGEX_2 = re.compile('([a-z0-9])([A-Z])')
 
@@ -29,3 +35,43 @@ def to_roman(number: int) -> str:
         return roman.toRoman(number)
     except (roman.NotIntegerError, roman.OutOfRangeError):
         return str(number)
+
+
+def get_element_id(collection_string: str, id: int) -> str:
+    """
+    Returns a combined string from the collection_string and an id.
+    """
+    return "{}:{}".format(collection_string, id)
+
+
+def split_element_id(element_id: Union[str, bytes]) -> Tuple[str, int]:
+    """
+    Splits a combined element_id into the collection_string and the id.
+    """
+    if isinstance(element_id, bytes):
+        element_id = element_id.decode()
+    collection_str, id = element_id.rsplit(":", 1)
+    return (collection_str, int(id))
+
+
+def get_user_id(user: Optional['CollectionElement']) -> int:
+    """
+    Returns the user id for an CollectionElement user.
+
+    Returns 0 for anonymous.
+    """
+    if user is None:
+        user_id = 0
+    else:
+        user_id = user.id
+    return user_id
+
+
+def str_dict_to_bytes(str_dict: Dict[str, str]) -> Dict[bytes, bytes]:
+    """
+    Converts the key and the value of a dict from str to bytes.
+    """
+    out = {}
+    for key, value in str_dict.items():
+        out[key.encode()] = value.encode()
+    return out

openslides/utils/validate.py

@@ -1,5 +1,6 @@
 import bleach
 
+
 allowed_tags = [
     'a', 'img',  # links and images
     'br', 'p', 'span', 'blockquote',  # text layout

requirements.txt

@@ -6,6 +6,8 @@ coverage
 #flake8
 # Use master of flake8 until flake8 3.6 is released that supports python3.7
 git+https://gitlab.com/pycqa/flake8.git
-isort==4.2.5
+isort
 mypy
-fakeredis
+pytest-django
+pytest-asyncio
+pytest-cov

requirements_big_mode.txt

@@ -2,8 +2,7 @@
 -r requirements_production.txt
 
 # Requirements for Redis and PostgreSQL support
-asgi-redis>=1.3,<1.5
+channels-redis>=2.2,<2.3
-django-redis>=4.7.0,<4.10
 django-redis-sessions>=0.6.1,<0.7
-psycopg2-binary>=2.7,<2.8
+psycopg2-binary>=2.7.3.2,<2.8
-txredisapi==1.4.4
+aioredis>=1.1.0,<1.2

requirements_production.txt

@@ -1,8 +1,8 @@
 # Requirements for OpenSlides in production in alphabetical order
 bleach>=1.5.0,<2.2
-channels>=1.1,<1.2
+channels>=2.1.2,<2.2
-daphne<2
+daphne>=2.2,<2.3
-Django>=1.10.4,<2.2
+Django>=1.11,<2.2
 djangorestframework>=3.4,<3.9
 jsonfield2>=3.0,<3.1
 mypy_extensions>=0.3,<0.4

setup.cfg

@@ -13,6 +13,8 @@ max_line_length = 150
 [isort]
 include_trailing_comma = true
 multi_line_output = 3
+lines_after_imports = 2
+combine_as_imports = true
 
 [mypy]
 ignore_missing_imports = true
@@ -25,5 +27,6 @@ disallow_untyped_defs = true
 [mypy-openslides.core.config]
 disallow_untyped_defs = true
 
-[mypy-tests.*]
+[tool:pytest]
-ignore_errors = true
+DJANGO_SETTINGS_MODULE = tests.settings
+testpaths = tests/

tests/conftest.py

@@ -0,0 +1,40 @@
+from django.test import TestCase, TransactionTestCase
+from pytest_django.plugin import validate_django_db
+
+
+def pytest_collection_modifyitems(items):
+    """
+    Helper until https://github.com/pytest-dev/pytest-django/issues/214 is fixed.
+    """
+    def get_marker_transaction(test):
+        marker = test.get_marker('django_db')
+        if marker:
+            validate_django_db(marker)
+            return marker.kwargs['transaction']
+
+        return None
+
+    def has_fixture(test, fixture):
+        funcargnames = getattr(test, 'funcargnames', None)
+        return funcargnames and fixture in funcargnames
+
+    def weight_test_case(test):
+        """
+        Key function for ordering test cases like the Django test runner.
+        """
+        is_test_case_subclass = test.cls and issubclass(test.cls, TestCase)
+        is_transaction_test_case_subclass = test.cls and issubclass(test.cls, TransactionTestCase)
+
+        if is_test_case_subclass or get_marker_transaction(test) is False:
+            return 0
+        elif has_fixture(test, 'db'):
+            return 0
+
+        if is_transaction_test_case_subclass or get_marker_transaction(test) is True:
+            return 1
+        elif has_fixture(test, 'transactional_db'):
+            return 1
+
+        return 0
+
+    items.sort(key=weight_test_case)

tests/example_data_generator/management/commands/create-example-data.py

@@ -12,6 +12,7 @@ from openslides.motions.models import Motion
 from openslides.topics.models import Topic
 from openslides.users.models import Group, User
 
+
 MOTION_NUMBER_OF_PARAGRAPHS = 4
 
 LOREM_IPSUM = [

tests/integration/agenda/test_viewset.py

@@ -1,8 +1,8 @@
+import pytest
 from django.contrib.auth import get_user_model
 from django.contrib.auth.models import Permission
 from django.urls import reverse
 from django.utils.translation import ugettext
-from django_redis import get_redis_connection
 from rest_framework import status
 from rest_framework.test import APIClient
 
@@ -12,10 +12,11 @@ from openslides.core.config import config
 from openslides.core.models import Countdown
 from openslides.motions.models import Motion
 from openslides.topics.models import Topic
-from openslides.users.models import User
 from openslides.utils.collection import CollectionElement
 from openslides.utils.test import TestCase
 
+from ..helpers import count_queries
+
 
 class RetrieveItem(TestCase):
     """
@@ -89,63 +90,29 @@ class RetrieveItem(TestCase):
         self.assertTrue(response.data.get('comment') is None)
 
 
-class TestDBQueries(TestCase):
+@pytest.mark.django_db(transaction=False)
+def test_agenda_item_db_queries():
     """
-    Tests that receiving elements only need the required db queries.
+    Tests that only the following db queries are done:
+    * 1 requests to get the list of all agenda items,
+    * 1 request to get all speakers,
+    * 3 requests to get the assignments, motions and topics and
 
-    Therefore in setup some agenda items are created and received with different
+    * 1 request to get an agenda item (why?)
-    user accounts.
+    * 2 requests for the motionsversions.
+    TODO: The last three request are a bug.
     """
+    for index in range(10):
+        Topic.objects.create(title='topic{}'.format(index))
+    parent = Topic.objects.create(title='parent').agenda_item
+    child = Topic.objects.create(title='child').agenda_item
+    child.parent = parent
+    child.save()
+    Motion.objects.create(title='motion1')
+    Motion.objects.create(title='motion2')
+    Assignment.objects.create(title='assignment', open_posts=5)
 
-    def setUp(self):
+    assert count_queries(Item.get_elements) == 8
-        self.client = APIClient()
-        config['general_system_enable_anonymous'] = True
-        for index in range(10):
-            Topic.objects.create(title='topic{}'.format(index))
-        parent = Topic.objects.create(title='parent').agenda_item
-        child = Topic.objects.create(title='child').agenda_item
-        child.parent = parent
-        child.save()
-        Motion.objects.create(title='motion1')
-        Motion.objects.create(title='motion2')
-        Assignment.objects.create(title='assignment', open_posts=5)
-
-    def test_admin(self):
-        """
-        Tests that only the following db queries are done:
-        * 7 requests to get the session an the request user with its permissions,
-        * 1 requests to get the list of all agenda items,
-        * 1 request to get all speakers,
-        * 3 requests to get the assignments, motions and topics and
-
-        * 1 request to get an agenda item (why?)
-
-        * 2 requests for the motionsversions.
-
-        TODO: The last two request for the motionsversions are a bug.
-        """
-        self.client.force_login(User.objects.get(pk=1))
-        get_redis_connection("default").flushall()
-        with self.assertNumQueries(15):
-            self.client.get(reverse('item-list'))
-
-    def test_anonymous(self):
-        """
-        Tests that only the following db queries are done:
-        * 3 requests to get the permission for anonymous,
-        * 1 requests to get the list of all agenda items,
-        * 1 request to get all speakers,
-        * 3 requests to get the assignments, motions and topics and
-
-        * 1 request to get an agenda item (why?)
-
-        * 2 requests for the motionsversions.
-
-        TODO: The last two request for the motionsversions are a bug.
-        """
-        get_redis_connection("default").flushall()
-        with self.assertNumQueries(11):
-            self.client.get(reverse('item-list'))
 
 
 class ManageSpeaker(TestCase):

tests/integration/assignments/test_viewset.py

@@ -1,66 +1,33 @@
+import pytest
 from django.contrib.auth import get_user_model
 from django.urls import reverse
-from django_redis import get_redis_connection
 from rest_framework import status
 from rest_framework.test import APIClient
 
 from openslides.assignments.models import Assignment
-from openslides.core.config import config
-from openslides.users.models import User
 from openslides.utils.test import TestCase
 
+from ..helpers import count_queries
 
-class TestDBQueries(TestCase):
+
+@pytest.mark.django_db(transaction=False)
+def test_assignment_db_queries():
     """
-    Tests that receiving elements only need the required db queries.
+    Tests that only the following db queries are done:
+    * 1 requests to get the list of all assignments,
+    * 1 request to get all related users,
+    * 1 request to get the agenda item,
+    * 1 request to get the polls,
+    * 1 request to get the tags and
 
-    Therefore in setup some assignments are created and received with different
+    * 10 request to fetch each related user again.
-    user accounts.
+
+    TODO: The last request are a bug.
     """
+    for index in range(10):
+        Assignment.objects.create(title='assignment{}'.format(index), open_posts=1)
 
-    def setUp(self):
+    assert count_queries(Assignment.get_elements) == 15
-        self.client = APIClient()
-        config['general_system_enable_anonymous'] = True
-        config.save_default_values()
-        for index in range(10):
-            Assignment.objects.create(title='motion{}'.format(index), open_posts=1)
-
-    def test_admin(self):
-        """
-        Tests that only the following db queries are done:
-        * 7 requests to get the session an the request user with its permissions,
-        * 1 requests to get the list of all assignments,
-        * 1 request to get all related users,
-        * 1 request to get the agenda item,
-        * 1 request to get the polls,
-        * 1 request to get the tags and
-
-        * 10 request to fetch each related user again.
-
-        TODO: The last request are a bug.
-        """
-        self.client.force_login(User.objects.get(pk=1))
-        get_redis_connection("default").flushall()
-        with self.assertNumQueries(22):
-            self.client.get(reverse('assignment-list'))
-
-    def test_anonymous(self):
-        """
-        Tests that only the following db queries are done:
-        * 3 requests to get the permission for anonymous,
-        * 1 requests to get the list of all assignments,
-        * 1 request to get all related users,
-        * 1 request to get the agenda item,
-        * 1 request to get the polls,
-        * 1 request to get the tags and
-
-        * 10 request to fetch each related user again.
-
-        TODO: The last 10 requests are an bug.
-        """
-        get_redis_connection("default").flushall()
-        with self.assertNumQueries(18):
-            self.client.get(reverse('assignment-list'))
 
 
 class CanidatureSelf(TestCase):
@@ -110,7 +77,6 @@ class CanidatureSelf(TestCase):
         group_delegates = type(group_admin).objects.get(name='Delegates')
         admin.groups.add(group_delegates)
         admin.groups.remove(group_admin)
-        get_redis_connection('default').flushall()
 
         response = self.client.post(reverse('assignment-candidature-self', args=[self.assignment.pk]))
 
@@ -157,7 +123,6 @@ class CanidatureSelf(TestCase):
         group_delegates = type(group_admin).objects.get(name='Delegates')
         admin.groups.add(group_delegates)
         admin.groups.remove(group_admin)
-        get_redis_connection('default').flushall()
 
         response = self.client.delete(reverse('assignment-candidature-self', args=[self.assignment.pk]))
 
@@ -238,7 +203,6 @@ class CandidatureOther(TestCase):
         group_delegates = type(group_admin).objects.get(name='Delegates')
         admin.groups.add(group_delegates)
         admin.groups.remove(group_admin)
-        get_redis_connection('default').flushall()
 
         response = self.client.post(
             reverse('assignment-candidature-other', args=[self.assignment.pk]),
@@ -294,7 +258,6 @@ class CandidatureOther(TestCase):
         group_delegates = type(group_admin).objects.get(name='Delegates')
         admin.groups.add(group_delegates)
         admin.groups.remove(group_admin)
-        get_redis_connection('default').flushall()
 
         response = self.client.delete(
             reverse('assignment-candidature-other', args=[self.assignment.pk]),

tests/integration/core/test_views.py

@@ -5,9 +5,11 @@ from django.urls import reverse
 from rest_framework import status
 from rest_framework.test import APIClient
 
-from openslides import __license__ as license
+from openslides import (
-from openslides import __url__ as url
+    __license__ as license,
-from openslides import __version__ as version
+    __url__ as url,
+    __version__ as version,
+)
 from openslides.core.config import ConfigVariable, config
 from openslides.core.models import Projector
 from openslides.topics.models import Topic
@@ -114,7 +116,7 @@ class ConfigViewSet(TestCase):
         # Save the old value of the config object and add the test values
         # TODO: Can be changed to setUpClass when Django 1.8 is no longer supported
         self._config_values = config.config_variables.copy()
-        config.key_to_id = {}
+        config.key_to_id = None
         config.update_config_variables(set_simple_config_view_integration_config_test())
         config.save_default_values()
 

tests/integration/core/test_viewset.py

@@ -1,150 +1,62 @@
+import pytest
 from django.urls import reverse
-from django_redis import get_redis_connection
 from rest_framework import status
-from rest_framework.test import APIClient
 
 from openslides.core.config import config
 from openslides.core.models import ChatMessage, Projector, Tag
 from openslides.users.models import User
 from openslides.utils.test import TestCase
 
+from ..helpers import count_queries
 
-class TestProjectorDBQueries(TestCase):
+
+@pytest.mark.django_db(transaction=False)
+def test_projector_db_queries():
     """
-    Tests that receiving elements only need the required db queries.
+    Tests that only the following db queries are done:
-
+    * 1 requests to get the list of all projectors,
-    Therefore in setup some objects are created and received with different
+    * 1 request to get the list of the projector defaults.
-    user accounts.
     """
+    for index in range(10):
+        Projector.objects.create(name="Projector{}".format(index))
 
-    def setUp(self):
+    assert count_queries(Projector.get_elements) == 2
-        self.client = APIClient()
-        config['general_system_enable_anonymous'] = True
-        config.save_default_values()
-        for index in range(10):
-            Projector.objects.create(name="Projector{}".format(index))
-
-    def test_admin(self):
-        """
-        Tests that only the following db queries are done:
-        * 7 requests to get the session an the request user with its permissions,
-        * 1 requests to get the list of all projectors,
-        * 1 request to get the list of the projector defaults.
-        """
-        self.client.force_login(User.objects.get(pk=1))
-        get_redis_connection("default").flushall()
-        with self.assertNumQueries(9):
-            self.client.get(reverse('projector-list'))
-
-    def test_anonymous(self):
-        """
-        Tests that only the following db queries are done:
-        * 3 requests to get the permission for anonymous,
-        * 1 requests to get the list of all projectors,
-        * 1 request to get the list of the projector defaults and
-        """
-        get_redis_connection("default").flushall()
-        with self.assertNumQueries(5):
-            self.client.get(reverse('projector-list'))
 
 
-class TestCharmessageDBQueries(TestCase):
+@pytest.mark.django_db(transaction=False)
+def test_chat_message_db_queries():
     """
-    Tests that receiving elements only need the required db queries.
+    Tests that only the following db queries are done:
-
+    * 1 requests to get the list of all chatmessages.
-    Therefore in setup some objects are created and received with different
-    user accounts.
     """
+    user = User.objects.get(username='admin')
+    for index in range(10):
+        ChatMessage.objects.create(user=user)
 
-    def setUp(self):
+    assert count_queries(ChatMessage.get_elements) == 1
-        self.client = APIClient()
-        config['general_system_enable_anonymous'] = True
-        config.save_default_values()
-        user = User.objects.get(pk=1)
-        for index in range(10):
-            ChatMessage.objects.create(user=user)
-
-    def test_admin(self):
-        """
-        Tests that only the following db queries are done:
-        * 7 requests to get the session an the request user with its permissions,
-        * 1 requests to get the list of all chatmessages,
-        """
-        self.client.force_login(User.objects.get(pk=1))
-        get_redis_connection("default").flushall()
-        with self.assertNumQueries(8):
-            self.client.get(reverse('chatmessage-list'))
 
 
-class TestTagDBQueries(TestCase):
+@pytest.mark.django_db(transaction=False)
+def test_tag_db_queries():
     """
-    Tests that receiving elements only need the required db queries.
+    Tests that only the following db queries are done:
-
+    * 1 requests to get the list of all tags.
-    Therefore in setup some objects are created and received with different
-    user accounts.
     """
+    for index in range(10):
+        Tag.objects.create(name='tag{}'.format(index))
 
-    def setUp(self):
+    assert count_queries(Tag.get_elements) == 1
-        self.client = APIClient()
-        config['general_system_enable_anonymous'] = True
-        config.save_default_values()
-        for index in range(10):
-            Tag.objects.create(name='tag{}'.format(index))
-
-    def test_admin(self):
-        """
-        Tests that only the following db queries are done:
-        * 5 requests to get the session an the request user with its permissions,
-        * 1 requests to get the list of all tags,
-        """
-        self.client.force_login(User.objects.get(pk=1))
-        get_redis_connection("default").flushall()
-        with self.assertNumQueries(6):
-            self.client.get(reverse('tag-list'))
-
-    def test_anonymous(self):
-        """
-        Tests that only the following db queries are done:
-        * 1 requests to see if anonyomus is enabled
-        * 1 requests to get the list of all projectors,
-        """
-        get_redis_connection("default").flushall()
-        with self.assertNumQueries(2):
-            self.client.get(reverse('tag-list'))
 
 
-class TestConfigDBQueries(TestCase):
+@pytest.mark.django_db(transaction=False)
+def test_config_db_queries():
     """
-    Tests that receiving elements only need the required db queries.
+    Tests that only the following db queries are done:
-
+    * 1 requests to get the list of all config values
-    Therefore in setup some objects are created and received with different
-    user accounts.
     """
+    config.save_default_values()
 
-    def setUp(self):
+    assert count_queries(Tag.get_elements) == 1
-        self.client = APIClient()
-        config['general_system_enable_anonymous'] = True
-        config.save_default_values()
-
-    def test_admin(self):
-        """
-        Tests that only the following db queries are done:
-        * 5 requests to get the session an the request user with its permissions and
-        * 1 requests to get the list of all config values
-        """
-        self.client.force_login(User.objects.get(pk=1))
-        get_redis_connection("default").flushall()
-        with self.assertNumQueries(6):
-            self.client.get(reverse('config-list'))
-
-    def test_anonymous(self):
-        """
-        Tests that only the following db queries are done:
-        * 1 requests to see if anonymous is enabled and get all config values
-        """
-        get_redis_connection("default").flushall()
-        with self.assertNumQueries(1):
-            self.client.get(reverse('config-list'))
 
 
 class ChatMessageViewSet(TestCase):
@@ -152,7 +64,7 @@ class ChatMessageViewSet(TestCase):
     Tests requests to deal with chat messages.
     """
     def setUp(self):
-        admin = User.objects.get(pk=1)
+        admin = User.objects.get(username='admin')
         self.client.force_login(admin)
         ChatMessage.objects.create(message='test_message_peechiel8IeZoohaem9e', user=admin)
 

tests/integration/helpers.py

@@ -0,0 +1,73 @@
+from typing import Any, Dict, List
+
+from asgiref.sync import sync_to_async
+from django.db import DEFAULT_DB_ALIAS, connections
+from django.test.utils import CaptureQueriesContext
+
+from openslides.core.config import config
+from openslides.users.models import User
+from openslides.utils.autoupdate import inform_data_collection_element_list
+from openslides.utils.cache import element_cache, get_element_id
+from openslides.utils.cache_providers import Cachable
+from openslides.utils.collection import CollectionElement
+
+
+class TConfig(Cachable):
+    """
+    Cachable, that fills the cache with the default values of the config variables.
+    """
+
+    def get_collection_string(self) -> str:
+        return config.get_collection_string()
+
+    def get_elements(self) -> List[Dict[str, Any]]:
+        elements = []
+        config.key_to_id = {}
+        for id, item in enumerate(config.config_variables.values()):
+            elements.append({'id': id+1, 'key': item.name, 'value': item.default_value})
+            config.key_to_id[item.name] = id+1
+        return elements
+
+
+class TUser(Cachable):
+    """
+    Cachable, that fills the cache with the default values of the config variables.
+    """
+
+    def get_collection_string(self) -> str:
+        return User.get_collection_string()
+
+    def get_elements(self) -> List[Dict[str, Any]]:
+        return [
+            {'id': 1, 'username': 'admin', 'title': '', 'first_name': '',
+             'last_name': 'Administrator', 'structure_level': '', 'number': '', 'about_me': '',
+             'groups_id': [4], 'is_present': False, 'is_committee': False, 'email': '',
+             'last_email_send': None, 'comment': '', 'is_active': True, 'default_password': 'admin',
+             'session_auth_hash': '362d4f2de1463293cb3aaba7727c967c35de43ee'}]
+
+
+async def set_config(key, value):
+    """
+    Set a config variable in the element_cache without hitting the database.
+    """
+    if not await element_cache.exists_full_data():
+        # Encure that the cache exists and the default values of the config are in it.
+        await element_cache.build_full_data()
+    collection_string = config.get_collection_string()
+    config_id = config.key_to_id[key]  # type: ignore
+    full_data = {'id': config_id, 'key': key, 'value': value}
+    await element_cache.change_elements({get_element_id(collection_string, config_id): full_data})
+    await sync_to_async(inform_data_collection_element_list)([
+        CollectionElement.from_values(collection_string, config_id, full_data=full_data)])
+
+
+def count_queries(func, *args, **kwargs) -> int:
+    context = CaptureQueriesContext(connections[DEFAULT_DB_ALIAS])
+    with context:
+        func(*args, **kwargs)
+
+    print("%d queries executed\nCaptured queries were:\n%s" % (
+        len(context),
+        '\n'.join(
+            '%d. %s' % (i, query['sql']) for i, query in enumerate(context.captured_queries, start=1))))
+    return len(context)

tests/integration/mediafiles/test_viewset.py

@@ -1,50 +1,22 @@
+import pytest
 from django.core.files.uploadedfile import SimpleUploadedFile
-from django.urls import reverse
-from django_redis import get_redis_connection
-from rest_framework.test import APIClient
 
-from openslides.core.config import config
 from openslides.mediafiles.models import Mediafile
-from openslides.users.models import User
+
-from openslides.utils.test import TestCase
+from ..helpers import count_queries
 
 
-class TestDBQueries(TestCase):
+@pytest.mark.django_db(transaction=False)
+def test_mediafiles_db_queries():
     """
-    Tests that receiving elements only need the required db queries.
+    Tests that only the following db queries are done:
-
+    * 1 requests to get the list of all files.
-    Therefore in setup some objects are created and received with different
-    user accounts.
     """
+    for index in range(10):
+        Mediafile.objects.create(
+            title='some_file{}'.format(index),
+            mediafile=SimpleUploadedFile(
+                'some_file{}'.format(index),
+                b'some content.'))
 
-    def setUp(self):
+    assert count_queries(Mediafile.get_elements) == 1
-        self.client = APIClient()
-        config['general_system_enable_anonymous'] = True
-        config.save_default_values()
-        for index in range(10):
-            Mediafile.objects.create(
-                title='some_file{}'.format(index),
-                mediafile=SimpleUploadedFile(
-                    'some_file{}'.format(index),
-                    b'some content.'))
-
-    def test_admin(self):
-        """
-        Tests that only the following db queries are done:
-        * 7 requests to get the session an the request user with its permissions and
-        * 1 requests to get the list of all files.
-        """
-        self.client.force_login(User.objects.get(pk=1))
-        get_redis_connection('default').flushall()
-        with self.assertNumQueries(8):
-            self.client.get(reverse('mediafile-list'))
-
-    def test_anonymous(self):
-        """
-        Tests that only the following db queries are done:
-        * 3 requests to get the permission for anonymous and
-        * 1 requests to get the list of all projectors.
-        """
-        get_redis_connection('default').flushall()
-        with self.assertNumQueries(4):
-            self.client.get(reverse('mediafile-list'))

tests/integration/motions/test_viewset.py

@@ -1,9 +1,9 @@
 import json
 
+import pytest
 from django.contrib.auth import get_user_model
 from django.contrib.auth.models import Permission
 from django.urls import reverse
-from django_redis import get_redis_connection
 from rest_framework import status
 from rest_framework.test import APIClient
 
@@ -22,134 +22,54 @@ from openslides.users.models import Group
 from openslides.utils.collection import CollectionElement
 from openslides.utils.test import TestCase
 
+from ..helpers import count_queries
 
-class TestMotionDBQueries(TestCase):
+
+@pytest.mark.django_db(transaction=False)
+def test_motion_db_queries():
     """
-    Tests that receiving elements only need the required db queries.
+    Tests that only the following db queries are done:
+    * 1 requests to get the list of all motions,
+    * 1 request to get the motion versions,
+    * 1 request to get the agenda item,
+    * 1 request to get the motion log,
+    * 1 request to get the polls,
+    * 1 request to get the attachments,
+    * 1 request to get the tags,
+    * 2 requests to get the submitters and supporters.
+    """
+    for index in range(10):
+        Motion.objects.create(title='motion{}'.format(index))
+        get_user_model().objects.create_user(
+            username='user_{}'.format(index),
+            password='password')
+    # TODO: Create some polls etc.
 
-    Therefore in setup some objects are created and received with different
+    assert count_queries(Motion.get_elements) == 9
-    user accounts.
+
+
+@pytest.mark.django_db(transaction=False)
+def test_category_db_queries():
+    """
+    Tests that only the following db queries are done:
+    * 1 requests to get the list of all categories.
+    """
+    for index in range(10):
+        Category.objects.create(name='category{}'.format(index))
+
+    assert count_queries(Category.get_elements) == 1
+
+
+@pytest.mark.django_db(transaction=False)
+def test_workflow_db_queries():
+    """
+    Tests that only the following db queries are done:
+    * 1 requests to get the list of all workflows,
+    * 1 request to get all states and
+    * 1 request to get the next states of all states.
     """
 
-    def setUp(self):
+    assert count_queries(Workflow.get_elements) == 3
-        self.client = APIClient()
-        config['general_system_enable_anonymous'] = True
-        config.save_default_values()
-        for index in range(10):
-            Motion.objects.create(title='motion{}'.format(index))
-            get_user_model().objects.create_user(
-                username='user_{}'.format(index),
-                password='password')
-        # TODO: Create some polls etc.
-
-    def test_admin(self):
-        """
-        Tests that only the following db queries are done:
-        * 7 requests to get the session an the request user with its permissions,
-        * 1 requests to get the list of all motions,
-        * 1 request to get the motion versions,
-        * 1 request to get the agenda item,
-        * 1 request to get the motion log,
-        * 1 request to get the polls,
-        * 1 request to get the attachments,
-        * 1 request to get the tags,
-        * 2 requests to get the submitters and supporters.
-        """
-        self.client.force_login(get_user_model().objects.get(pk=1))
-        get_redis_connection('default').flushall()
-        with self.assertNumQueries(16):
-            self.client.get(reverse('motion-list'))
-
-    def test_anonymous(self):
-        """
-        Tests that only the following db queries are done:
-        * 3 requests to get the permission for anonymous,
-        * 1 requests to get the list of all motions,
-        * 1 request to get the motion versions,
-        * 1 request to get the agenda item,
-        * 1 request to get the motion log,
-        * 1 request to get the polls,
-        * 1 request to get the attachments,
-        * 1 request to get the tags,
-        * 2 requests to get the submitters and supporters.
-        """
-        get_redis_connection('default').flushall()
-        with self.assertNumQueries(12):
-            self.client.get(reverse('motion-list'))
-
-
-class TestCategoryDBQueries(TestCase):
-    """
-    Tests that receiving elements only need the required db queries.
-
-    Therefore in setup some objects are created and received with different
-    user accounts.
-    """
-
-    def setUp(self):
-        self.client = APIClient()
-        config.save_default_values()
-        config['general_system_enable_anonymous'] = True
-        for index in range(10):
-            Category.objects.create(name='category{}'.format(index))
-
-    def test_admin(self):
-        """
-        Tests that only the following db queries are done:
-        * 7 requests to get the session an the request user with its permissions and
-        * 1 requests to get the list of all categories.
-        """
-        self.client.force_login(get_user_model().objects.get(pk=1))
-        get_redis_connection('default').flushall()
-        with self.assertNumQueries(8):
-            self.client.get(reverse('category-list'))
-
-    def test_anonymous(self):
-        """
-        Tests that only the following db queries are done:
-        * 3 requests to get the permission for anonymous (config and permissions)
-        * 1 requests to get the list of all motions and
-        """
-        get_redis_connection('default').flushall()
-        with self.assertNumQueries(4):
-            self.client.get(reverse('category-list'))
-
-
-class TestWorkflowDBQueries(TestCase):
-    """
-    Tests that receiving elements only need the required db queries.
-    """
-
-    def setUp(self):
-        self.client = APIClient()
-        config.save_default_values()
-        config['general_system_enable_anonymous'] = True
-        # There do not need to be more workflows
-
-    def test_admin(self):
-        """
-        Tests that only the following db queries are done:
-        * 7 requests to get the session an the request user with its permissions,
-        * 1 requests to get the list of all workflows,
-        * 1 request to get all states and
-        * 1 request to get the next states of all states.
-        """
-        self.client.force_login(get_user_model().objects.get(pk=1))
-        get_redis_connection('default').flushall()
-        with self.assertNumQueries(10):
-            self.client.get(reverse('workflow-list'))
-
-    def test_anonymous(self):
-        """
-        Tests that only the following db queries are done:
-        * 3 requests to get the permission for anonymous,
-        * 1 requests to get the list of all workflows,
-        * 1 request to get all states and
-        * 1 request to get the next states of all states.
-        """
-        get_redis_connection('default').flushall()
-        with self.assertNumQueries(6):
-            self.client.get(reverse('workflow-list'))
 
 
 class CreateMotion(TestCase):
@@ -328,6 +248,10 @@ class CreateMotion(TestCase):
             content_type__app_label='motions',
             codename='can_manage_comments',
         ))
+        group_delegate.permissions.add(Permission.objects.get(
+            content_type__app_label='motions',
+            codename='can_see_comments',
+        ))
 
         response = self.client.post(
             reverse('motion-list'),
@@ -383,7 +307,6 @@ class CreateMotion(TestCase):
         self.admin = get_user_model().objects.get(username='admin')
         self.admin.groups.add(2)
         self.admin.groups.remove(4)
-        get_redis_connection('default').flushall()
 
         response = self.client.post(
             reverse('motion-list'),
@@ -424,24 +347,6 @@ class RetrieveMotion(TestCase):
                 username='user_{}'.format(index),
                 password='password')
 
-    def test_number_of_queries(self):
-        """
-        Tests that only the following db queries are done:
-        * 7 requests to get the session and the request user with its permissions (3 of them are possibly a bug)
-        * 1 request to get the motion,
-        * 1 request to get the version,
-        * 1 request to get the agenda item,
-        * 1 request to get the log,
-        * 3 request to get the polls (1 of them is possibly a bug),
-        * 1 request to get the attachments,
-        * 1 request to get the tags,
-        * 2 requests to get the submitters and supporters.
-        TODO: Fix all bugs.
-        """
-        get_redis_connection('default').flushall()
-        with self.assertNumQueries(18):
-            self.client.get(reverse('motion-detail', args=[self.motion.pk]))
-
     def test_guest_state_with_required_permission_to_see(self):
         config['general_system_enable_anonymous'] = True
         guest_client = APIClient()
@@ -450,7 +355,7 @@ class RetrieveMotion(TestCase):
         state.save()
         # The cache has to be cleared, see:
         # https://github.com/OpenSlides/OpenSlides/issues/3396
-        get_redis_connection('default').flushall()
+
         response = guest_client.get(reverse('motion-detail', args=[self.motion.pk]))
         self.assertEqual(response.status_code, status.HTTP_403_FORBIDDEN)
 
@@ -484,7 +389,6 @@ class RetrieveMotion(TestCase):
         group.permissions.remove(permission)
         config['general_system_enable_anonymous'] = True
         guest_client = APIClient()
-        get_redis_connection('default').flushall()
 
         response_1 = guest_client.get(reverse('motion-detail', args=[self.motion.pk]))
         self.assertEqual(response_1.status_code, status.HTTP_200_OK)
@@ -495,7 +399,7 @@ class RetrieveMotion(TestCase):
         extra_user = get_user_model().objects.create_user(
             username='username_wequePhieFoom0hai3wa',
             password='password_ooth7taechai5Oocieya')
-        get_redis_connection('default').flushall()
+
         response_3 = guest_client.get(reverse('user-detail', args=[extra_user.pk]))
         self.assertEqual(response_3.status_code, status.HTTP_403_FORBIDDEN)
 
@@ -576,7 +480,6 @@ class UpdateMotion(TestCase):
         self.motion.supporters.add(supporter)
         config['motions_remove_supporters'] = True
         self.assertEqual(self.motion.supporters.count(), 1)
-        get_redis_connection('default').flushall()
 
         response = self.client.patch(
             reverse('motion-detail', args=[self.motion.pk]),
@@ -939,7 +842,7 @@ class SupportMotion(TestCase):
 
     def test_support(self):
         config['motions_min_supporters'] = 1
-        get_redis_connection('default').flushall()
+
         response = self.client.post(reverse('motion-support', args=[self.motion.pk]))
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         self.assertEqual(response.data, {'detail': 'You have supported this motion successfully.'})

tests/integration/topics/test_viewset.py

@@ -1,54 +1,26 @@
-from django.contrib.auth import get_user_model
+import pytest
 from django.urls import reverse
-from django_redis import get_redis_connection
 from rest_framework import status
-from rest_framework.test import APIClient
 
 from openslides.agenda.models import Item
-from openslides.core.config import config
 from openslides.topics.models import Topic
 from openslides.utils.test import TestCase
 
+from ..helpers import count_queries
 
-class TestDBQueries(TestCase):
+
+@pytest.mark.django_db(transaction=False)
+def test_topic_item_db_queries():
     """
-    Tests that receiving elements only need the required db queries.
+    Tests that only the following db queries are done:
-
+    * 1 requests to get the list of all topics,
-    Therefore in setup some topics are created and received with different
+    * 1 request to get attachments,
-    user accounts.
+    * 1 request to get the agenda item
     """
+    for index in range(10):
+        Topic.objects.create(title='topic-{}'.format(index))
 
-    def setUp(self):
+    assert count_queries(Topic.get_elements) == 3
-        self.client = APIClient()
-        config['general_system_enable_anonymous'] = True
-        config.save_default_values()
-        for index in range(10):
-            Topic.objects.create(title='topic-{}'.format(index))
-
-    def test_admin(self):
-        """
-        Tests that only the following db queries are done:
-        * 7 requests to get the session an the request user with its permissions,
-        * 1 requests to get the list of all topics,
-        * 1 request to get attachments,
-        * 1 request to get the agenda item
-        """
-        self.client.force_login(get_user_model().objects.get(pk=1))
-        get_redis_connection('default').flushall()
-        with self.assertNumQueries(10):
-            self.client.get(reverse('topic-list'))
-
-    def test_anonymous(self):
-        """
-        Tests that only the following db queries are done:
-        * 3 requests to get the permission for anonymous,
-        * 1 requests to get the list of all topics,
-        * 1 request to get attachments,
-        * 1 request to get the agenda item,
-        """
-        get_redis_connection('default').flushall()
-        with self.assertNumQueries(6):
-            self.client.get(reverse('topic-list'))
 
 
 class TopicCreate(TestCase):

tests/integration/users/test_viewset.py

@@ -1,6 +1,6 @@
+import pytest
 from django.core import mail
 from django.urls import reverse
-from django_redis import get_redis_connection
 from rest_framework import status
 from rest_framework.test import APIClient
 
@@ -9,84 +9,33 @@ from openslides.users.models import Group, PersonalNote, User
 from openslides.users.serializers import UserFullSerializer
 from openslides.utils.test import TestCase
 
+from ..helpers import count_queries
 
-class TestUserDBQueries(TestCase):
+
+@pytest.mark.django_db(transaction=False)
+def test_user_db_queries():
     """
-    Tests that receiving elements only need the required db queries.
+    Tests that only the following db queries are done:
-
+    * 2 requests to get the list of all users and
-    Therefore in setup some objects are created and received with different
+    * 1 requests to get the list of all groups.
-    user accounts.
     """
+    for index in range(10):
+        User.objects.create(username='user{}'.format(index))
 
-    def setUp(self):
+    assert count_queries(User.get_elements) == 3
-        self.client = APIClient()
-        config['general_system_enable_anonymous'] = True
-        config.save_default_values()
-        for index in range(10):
-            User.objects.create(username='user{}'.format(index))
-
-    def test_admin(self):
-        """
-        Tests that only the following db queries are done:
-        * 2 requests to get the session and the request user with its permissions,
-        * 2 requests to get the list of all users and
-        * 1 requests to get the list of all groups.
-        """
-        self.client.force_login(User.objects.get(pk=1))
-        get_redis_connection('default').flushall()
-        with self.assertNumQueries(7):
-            self.client.get(reverse('user-list'))
-
-    def test_anonymous(self):
-        """
-        Tests that only the following db queries are done:
-        * 3 requests to get the permission for anonymous,
-        * 1 requests to get the list of all users and
-        * 2 request to get all groups (needed by the user serializer).
-        """
-        get_redis_connection('default').flushall()
-        with self.assertNumQueries(6):
-            self.client.get(reverse('user-list'))
 
 
-class TestGroupDBQueries(TestCase):
+@pytest.mark.django_db(transaction=False)
+def test_group_db_queries():
     """
-    Tests that receiving elements only need the required db queries.
+    Tests that only the following db queries are done:
-
+    * 1 request to get the list of all groups.
-    Therefore in setup some objects are created and received with different
+    * 1 request to get the permissions
-    user accounts.
     """
+    for index in range(10):
+        Group.objects.create(name='group{}'.format(index))
 
-    def setUp(self):
+    assert count_queries(Group.get_elements) == 2
-        self.client = APIClient()
-        config['general_system_enable_anonymous'] = True
-        config.save_default_values()
-        for index in range(10):
-            Group.objects.create(name='group{}'.format(index))
-
-    def test_admin(self):
-        """
-        Tests that only the following db queries are done:
-        * 6 requests to get the session an the request user with its permissions and
-        * 1 request to get the list of all groups.
-
-        The data of the groups where loaded when the admin was authenticated. So
-        only the list of all groups has be fetched from the db.
-        """
-        self.client.force_login(User.objects.get(pk=1))
-        get_redis_connection('default').flushall()
-        with self.assertNumQueries(7):
-            self.client.get(reverse('group-list'))
-
-    def test_anonymous(self):
-        """
-        Tests that only the following db queries are done:
-        * 1 requests to find out if anonymous is enabled
-        * 2 request to get the list of all groups and
-        """
-        get_redis_connection('default').flushall()
-        with self.assertNumQueries(3):
-            self.client.get(reverse('group-list'))
 
 
 class UserGetTest(TestCase):
@@ -98,7 +47,7 @@ class UserGetTest(TestCase):
         It is invalid, that a user is in the group with the pk 1. But if the
         database is invalid, the user should nevertheless be received.
         """
-        admin = User.objects.get(pk=1)
+        admin = User.objects.get(username='admin')
         group1 = Group.objects.get(pk=1)
         admin.groups.add(group1)
         self.client.login(username='admin', password='admin')
@@ -178,7 +127,7 @@ class UserUpdate(TestCase):
         admin_client = APIClient()
         admin_client.login(username='admin', password='admin')
         # This is the builtin user 'Administrator' with username 'admin'. The pk is valid.
-        user_pk = 1
+        user_pk = User.objects.get(username='admin').pk
 
         response = admin_client.patch(
             reverse('user-detail', args=[user_pk]),
@@ -198,14 +147,14 @@ class UserUpdate(TestCase):
         admin_client = APIClient()
         admin_client.login(username='admin', password='admin')
         # This is the builtin user 'Administrator'. The pk is valid.
-        user_pk = 1
+        user_pk = User.objects.get(username='admin').pk
 
         response = admin_client.put(
             reverse('user-detail', args=[user_pk]),
             {'last_name': 'New name Ohy4eeyei5'})
 
         self.assertEqual(response.status_code, 200)
-        self.assertEqual(User.objects.get(pk=1).username, 'New name Ohy4eeyei5')
+        self.assertEqual(User.objects.get(pk=user_pk).username, 'New name Ohy4eeyei5')
 
     def test_update_deactivate_yourselfself(self):
         """
@@ -214,7 +163,7 @@ class UserUpdate(TestCase):
         admin_client = APIClient()
         admin_client.login(username='admin', password='admin')
         # This is the builtin user 'Administrator'. The pk is valid.
-        user_pk = 1
+        user_pk = User.objects.get(username='admin').pk
 
         response = admin_client.patch(
             reverse('user-detail', args=[user_pk]),
@@ -581,7 +530,7 @@ class PersonalNoteTest(TestCase):
     Tests for PersonalNote model.
     """
     def test_anonymous_without_personal_notes(self):
-        admin = User.objects.get(pk=1)
+        admin = User.objects.get(username='admin')
         personal_note = PersonalNote.objects.create(user=admin, notes='["admin_personal_note_OoGh8choro0oosh0roob"]')
         config['general_system_enable_anonymous'] = True
         guest_client = APIClient()

tests/integration/utils/test_collection.py

@@ -1,17 +1,17 @@
-from channels.tests import ChannelTestCase as TestCase
+from unittest import skip
-from django_redis import get_redis_connection
 
 from openslides.topics.models import Topic
 from openslides.utils import collection
+from openslides.utils.test import TestCase
 
 
 class TestCollectionElementCache(TestCase):
+    @skip("Does not work as long as caching does not work in the tests")
     def test_clean_cache(self):
         """
         Tests that the data is retrieved from the database.
         """
         topic = Topic.objects.create(title='test topic')
-        get_redis_connection("default").flushall()
 
         with self.assertNumQueries(3):
             collection_element = collection.CollectionElement.from_values('topics/topic', 1)
@@ -19,6 +19,7 @@ class TestCollectionElementCache(TestCase):
 
         self.assertEqual(topic.title, instance['title'])
 
+    @skip("Does not work as long as caching does not work in the tests")
     def test_with_cache(self):
         """
         Tests that no db query is used when the valie is in the cache.
@@ -43,6 +44,7 @@ class TestCollectionElementCache(TestCase):
             collection.CollectionElement.from_values('topics/topic', 999)
 
 
+@skip("Does not work as long as caching does not work in the tests")
 class TestCollectionCache(TestCase):
     def test_clean_cache(self):
         """
@@ -52,7 +54,6 @@ class TestCollectionCache(TestCase):
         Topic.objects.create(title='test topic2')
         Topic.objects.create(title='test topic3')
         topic_collection = collection.Collection('topics/topic')
-        get_redis_connection("default").flushall()
 
         with self.assertNumQueries(3):
             instance_list = list(topic_collection.get_full_data())
@@ -62,7 +63,6 @@ class TestCollectionCache(TestCase):
         """
         Tests that no db query is used when the list is received twice.
         """
-        get_redis_connection("default").flushall()
         Topic.objects.create(title='test topic1')
         Topic.objects.create(title='test topic2')
         Topic.objects.create(title='test topic3')

tests/integration/utils/test_consumers.py

@@ -0,0 +1,185 @@
+from importlib import import_module
+
+import pytest
+from asgiref.sync import sync_to_async
+from channels.testing import WebsocketCommunicator
+from django.conf import settings
+from django.contrib.auth import (
+    BACKEND_SESSION_KEY,
+    HASH_SESSION_KEY,
+    SESSION_KEY,
+)
+
+from openslides.asgi import application
+from openslides.core.config import config
+from openslides.utils.autoupdate import inform_deleted_data
+from openslides.utils.cache import element_cache
+
+from ...unit.utils.cache_provider import (
+    Collection1,
+    Collection2,
+    get_cachable_provider,
+)
+from ..helpers import TConfig, TUser, set_config
+
+
+@pytest.fixture(autouse=True)
+def prepare_element_cache(settings):
+    """
+    Resets the element cache.
+
+    Uses a cacheable_provider for tests with example data.
+    """
+    settings.SKIP_CACHE = False
+    element_cache.cache_provider.clear_cache()
+    orig_cachable_provider = element_cache.cachable_provider
+    element_cache.cachable_provider = get_cachable_provider([Collection1(), Collection2(), TConfig(), TUser()])
+    element_cache._cachables = None
+    yield
+    # Reset the cachable_provider
+    element_cache.cachable_provider = orig_cachable_provider
+    element_cache._cachables = None
+    element_cache.cache_provider.clear_cache()
+
+
+@pytest.fixture
+def communicator(request, event_loop):
+    communicator = WebsocketCommunicator(application, "/ws/site/")
+
+    # This style is needed for python 3.5. Use the generaor style when 3.5 ist dropped
+    def fin():
+        async def afin():
+            await communicator.disconnect()
+        event_loop.run_until_complete(afin())
+
+    request.addfinalizer(fin)
+    return communicator
+
+
+@pytest.mark.asyncio
+async def test_normal_connection(communicator):
+    await set_config('general_system_enable_anonymous', True)
+    await communicator.connect()
+
+    response = await communicator.receive_json_from()
+
+    # Test, that there is a lot of startup data.
+    assert len(response) > 5
+
+
+@pytest.mark.asyncio
+async def test_receive_changed_data(communicator):
+    await set_config('general_system_enable_anonymous', True)
+    await communicator.connect()
+    await communicator.receive_json_from()
+
+    # Change a config value after the startup data has been received
+    await set_config('general_event_name', 'Test Event')
+    response = await communicator.receive_json_from()
+
+    id = config.get_key_to_id()['general_event_name']
+    assert response == [
+        {'action': 'changed',
+         'collection': 'core/config',
+         'data': {'id': id, 'key': 'general_event_name', 'value': 'Test Event'},
+         'id': id}]
+
+
+@pytest.mark.asyncio
+async def test_anonymous_disabled(communicator):
+    connected, __ = await communicator.connect()
+
+    assert not connected
+
+
+@pytest.mark.asyncio
+async def test_with_user():
+    # login user with id 1
+    engine = import_module(settings.SESSION_ENGINE)
+    session = engine.SessionStore()  # type: ignore
+    session[SESSION_KEY] = '1'
+    session[HASH_SESSION_KEY] = '362d4f2de1463293cb3aaba7727c967c35de43ee'  # see helpers.TUser
+    session[BACKEND_SESSION_KEY] = 'django.contrib.auth.backends.ModelBackend'
+    session.save()
+    scn = settings.SESSION_COOKIE_NAME
+    cookies = (b'cookie', '{}={}'.format(scn, session.session_key).encode())
+    communicator = WebsocketCommunicator(application, "/ws/site/", headers=[cookies])
+
+    connected, __ = await communicator.connect()
+
+    assert connected
+
+    await communicator.disconnect()
+
+
+@pytest.mark.asyncio
+async def test_receive_deleted_data(communicator):
+    await set_config('general_system_enable_anonymous', True)
+    await communicator.connect()
+    await communicator.receive_json_from()
+
+    # Delete test element
+    await sync_to_async(inform_deleted_data)([(Collection1().get_collection_string(), 1)])
+    response = await communicator.receive_json_from()
+
+    assert response == [{'action': 'deleted', 'collection': Collection1().get_collection_string(), 'id': 1}]
+
+
+@pytest.mark.asyncio
+async def test_send_invalid_notify_not_a_list(communicator):
+    await set_config('general_system_enable_anonymous', True)
+    await communicator.connect()
+    # Await the startup data
+    await communicator.receive_json_from()
+
+    await communicator.send_json_to({'testmessage': 'foobar, what else.'})
+
+    response = await communicator.receive_json_from()
+
+    assert response == {'error': 'invalid message'}
+
+
+@pytest.mark.asyncio
+async def test_send_invalid_notify_no_elements(communicator):
+    await set_config('general_system_enable_anonymous', True)
+    await communicator.connect()
+    # Await the startup data
+    await communicator.receive_json_from()
+
+    await communicator.send_json_to([])
+
+    response = await communicator.receive_json_from()
+
+    assert response == {'error': 'invalid message'}
+
+
+@pytest.mark.asyncio
+async def test_send_invalid_notify_str_in_list(communicator):
+    await set_config('general_system_enable_anonymous', True)
+    await communicator.connect()
+    # Await the startup data
+    await communicator.receive_json_from()
+
+    await communicator.send_json_to([{}, 'testmessage'])
+
+    response = await communicator.receive_json_from()
+
+    assert response == {'error': 'invalid message'}
+
+
+@pytest.mark.asyncio
+async def test_send_valid_notify(communicator):
+    await set_config('general_system_enable_anonymous', True)
+    await communicator.connect()
+    # Await the startup data
+    await communicator.receive_json_from()
+
+    await communicator.send_json_to([{'testmessage': 'foobar, what else.'}])
+
+    response = await communicator.receive_json_from()
+
+    assert isinstance(response, list)
+    assert len(response) == 1
+    assert response[0]['testmessage'] == 'foobar, what else.'
+    assert 'senderReplyChannelName' in response[0]
+    assert response[0]['senderUserId'] == 0

tests/old/config/test_config.py

@@ -1,11 +1,11 @@
-from django_redis import get_redis_connection
+
 
 from openslides.core.config import ConfigVariable, config
 from openslides.core.exceptions import ConfigError, ConfigNotFound
 from openslides.utils.test import TestCase
 
 
-class TestConfigException(Exception):
+class TTestConfigException(Exception):
     pass
 
 
@@ -57,7 +57,6 @@ class HandleConfigTest(TestCase):
     def test_change_config_value(self):
         self.assertEqual(config['string_var'], 'default_string_rien4ooCZieng6ah')
         config['string_var'] = 'other_special_unique_string dauTex9eAiy7jeen'
-        get_redis_connection('default').flushall()
         self.assertEqual(config['string_var'], 'other_special_unique_string dauTex9eAiy7jeen')
 
     def test_missing_cache_(self):
@@ -79,7 +78,7 @@ class HandleConfigTest(TestCase):
         message.
         """
         with self.assertRaisesMessage(
-                TestConfigException,
+                TTestConfigException,
                 'Change callback dhcnfg34dlg06kdg successfully called.'):
             self.set_config_var(
                 key='var_with_callback_ghvnfjd5768gdfkwg0hm2',
@@ -155,7 +154,7 @@ def set_simple_config_collection_disabled_view():
 
 def set_simple_config_collection_with_callback():
     def callback():
-        raise TestConfigException('Change callback dhcnfg34dlg06kdg successfully called.')
+        raise TTestConfigException('Change callback dhcnfg34dlg06kdg successfully called.')
     yield ConfigVariable(
         name='var_with_callback_ghvnfjd5768gdfkwg0hm2',
         default_value='',

tests/old/motions/test_models.py

@@ -1,5 +1,3 @@
-from django_redis import get_redis_connection
-
 from openslides.core.config import config
 from openslides.motions.exceptions import WorkflowError
 from openslides.motions.models import Motion, State, Workflow
@@ -132,7 +130,6 @@ class ModelTest(TestCase):
 
     def test_is_amendment(self):
         config['motions_amendments_enabled'] = True
-        get_redis_connection('default').flushall()
         amendment = Motion.objects.create(title='amendment', parent=self.motion)
 
         self.assertTrue(amendment.is_amendment())
@@ -153,7 +150,6 @@ class ModelTest(TestCase):
         If the config is set to manually, the method does nothing.
         """
         config['motions_identifier'] = 'manually'
-        get_redis_connection("default").flushall()
         motion = Motion()
 
         motion.set_identifier()
@@ -169,7 +165,6 @@ class ModelTest(TestCase):
         config['motions_amendments_enabled'] = True
         self.motion.identifier = 'Parent identifier'
         self.motion.save()
-        get_redis_connection("default").flushall()
         motion = Motion(parent=self.motion)
 
         motion.set_identifier()
@@ -184,7 +179,6 @@ class ModelTest(TestCase):
         config['motions_amendments_enabled'] = True
         self.motion.identifier = 'Parent identifier'
         self.motion.save()
-        get_redis_connection("default").flushall()
         Motion.objects.create(title='Amendment1', parent=self.motion)
         motion = Motion(parent=self.motion)
 

tests/settings.py

@@ -6,6 +6,7 @@ import os
 
 from openslides.global_settings import *  # noqa
 
+
 # Path to the directory for user specific data files
 
 OPENSLIDES_USER_DATA_PATH = os.path.realpath(os.path.dirname(os.path.abspath(__file__)))
@@ -42,6 +43,16 @@ DATABASES = {
     }
 }
 
+# Configure session in the cache
+
+CACHES = {
+    'default': {
+        'BACKEND': 'django.core.cache.backends.locmem.LocMemCache',
+    }
+}
+
+SESSION_ENGINE = "django.contrib.sessions.backends.cache"
+
 # When use_redis is True, the restricted data cache caches the data individuel
 # for each user. This requires a lot of memory if there are a lot of active
 # users. If use_redis is False, this setting has no effect.
@@ -72,20 +83,12 @@ MOTION_IDENTIFIER_MIN_DIGITS = 1
 
 # Special settings only for testing
 
-TEST_RUNNER = 'openslides.utils.test.OpenSlidesDiscoverRunner'
-
 # Use a faster password hasher.
 
 PASSWORD_HASHERS = [
     'django.contrib.auth.hashers.MD5PasswordHasher',
 ]
 
-CACHES = {
+# At least in Django 2.1 and Channels 2.1 the django transactions can not be shared between
-    "default": {
+# threads. So we have to skip the asyncio-cache.
-        "BACKEND": "django_redis.cache.RedisCache",
+SKIP_CACHE = True
-        "LOCATION": "redis://127.0.0.1:6379/0",
-        "OPTIONS": {
-            "REDIS_CLIENT_CLASS": "fakeredis.FakeStrictRedis",
-        }
-    }
-}

tests/unit/utils/cache_provider.py

@@ -0,0 +1,82 @@
+import asyncio  # noqa
+from typing import Any, Callable, Dict, List, Optional
+
+from openslides.utils.cache_providers import Cachable, MemmoryCacheProvider
+from openslides.utils.collection import CollectionElement  # noqa
+
+
+def restrict_elements(
+        user: Optional['CollectionElement'],
+        elements: List[Dict[str, Any]]) -> List[Dict[str, Any]]:
+    """
+    Adds the prefix 'restricted_' to all values except id.
+    """
+    out = []
+    for element in elements:
+        restricted_element = {}
+        for key, value in element.items():
+            if key == 'id':
+                restricted_element[key] = value
+            else:
+                restricted_element[key] = 'restricted_{}'.format(value)
+        out.append(restricted_element)
+    return out
+
+
+class Collection1(Cachable):
+    def get_collection_string(self) -> str:
+        return 'app/collection1'
+
+    def get_elements(self) -> List[Dict[str, Any]]:
+        return [
+            {'id': 1, 'value': 'value1'},
+            {'id': 2, 'value': 'value2'}]
+
+    def restrict_elements(self, user: Optional['CollectionElement'], elements: List[Dict[str, Any]]) -> List[Dict[str, Any]]:
+        return restrict_elements(user, elements)
+
+
+class Collection2(Cachable):
+    def get_collection_string(self) -> str:
+        return 'app/collection2'
+
+    def get_elements(self) -> List[Dict[str, Any]]:
+        return [
+            {'id': 1, 'key': 'value1'},
+            {'id': 2, 'key': 'value2'}]
+
+    def restrict_elements(self, user: Optional['CollectionElement'], elements: List[Dict[str, Any]]) -> List[Dict[str, Any]]:
+        return restrict_elements(user, elements)
+
+
+def get_cachable_provider(cachables: List[Cachable] = [Collection1(), Collection2()]) -> Callable[[], List[Cachable]]:
+    """
+    Returns a cachable_provider.
+    """
+    return lambda: cachables
+
+
+def example_data():
+    return {
+        'app/collection1': [
+            {'id': 1, 'value': 'value1'},
+            {'id': 2, 'value': 'value2'}],
+        'app/collection2': [
+            {'id': 1, 'key': 'value1'},
+            {'id': 2, 'key': 'value2'}]}
+
+
+class TTestCacheProvider(MemmoryCacheProvider):
+    """
+    CacheProvider simular to the MemmoryCacheProvider with special methods for
+    testing.
+    """
+
+    async def del_lock_restricted_data_after_wait(self, user_id: int, future: asyncio.Future = None) -> None:
+        if future is None:
+            asyncio.ensure_future(self.del_lock_restricted_data(user_id))
+        else:
+            async def set_future() -> None:
+                await self.del_lock_restricted_data(user_id)
+                future.set_result(1)  # type: ignore
+            asyncio.ensure_future(set_future())

tests/unit/utils/test_cache.py

@@ -0,0 +1,483 @@
+import asyncio
+import json
+from typing import Any, Dict, List
+
+import pytest
+
+from openslides.utils.cache import ElementCache
+
+from .cache_provider import (
+    TTestCacheProvider,
+    example_data,
+    get_cachable_provider,
+)
+
+
+def decode_dict(encoded_dict: Dict[str, str]) -> Dict[str, Any]:
+    """
+    Helper function that loads the json values of a dict.
+    """
+    return {key: json.loads(value) for key, value in encoded_dict.items()}
+
+
+def sort_dict(encoded_dict: Dict[str, List[Dict[str, Any]]]) -> Dict[str, List[Dict[str, Any]]]:
+    """
+    Helper function that sorts the value of a dict.
+    """
+    return {key: sorted(value, key=lambda x: x['id']) for key, value in encoded_dict.items()}
+
+
+@pytest.fixture
+def element_cache():
+    return ElementCache(
+        'test_redis',
+        cache_provider_class=TTestCacheProvider,
+        cachable_provider=get_cachable_provider(),
+        start_time=0)
+
+
+@pytest.mark.asyncio
+async def test_save_full_data(element_cache):
+    input_data = {
+        'app/collection1': [
+            {'id': 1, 'value': 'value1'},
+            {'id': 2, 'value': 'value2'}],
+        'app/collection2': [
+            {'id': 1, 'key': 'value1'},
+            {'id': 2, 'key': 'value2'}]}
+    calculated_data = {
+        'app/collection1:1': '{"id": 1, "value": "value1"}',
+        'app/collection1:2': '{"id": 2, "value": "value2"}',
+        'app/collection2:1': '{"id": 1, "key": "value1"}',
+        'app/collection2:2': '{"id": 2, "key": "value2"}'}
+
+    await element_cache.save_full_data(input_data)
+
+    assert decode_dict(element_cache.cache_provider.full_data) == decode_dict(calculated_data)
+
+
+@pytest.mark.asyncio
+async def test_build_full_data(element_cache):
+    result = await element_cache.build_full_data()
+
+    assert result == example_data()
+    assert decode_dict(element_cache.cache_provider.full_data) == decode_dict({
+        'app/collection1:1': '{"id": 1, "value": "value1"}',
+        'app/collection1:2': '{"id": 2, "value": "value2"}',
+        'app/collection2:1': '{"id": 1, "key": "value1"}',
+        'app/collection2:2': '{"id": 2, "key": "value2"}'})
+
+
+@pytest.mark.asyncio
+async def test_exists_full_data(element_cache):
+    """
+    Test that the return value of exists_full_data is the the same as from the
+    cache_provider.
+    """
+    element_cache.cache_provider.full_data = 'test_value'
+    assert await element_cache.exists_full_data()
+
+
+@pytest.mark.asyncio
+async def test_change_elements(element_cache):
+    input_data = {
+        'app/collection1:1': {"id": 1, "value": "updated"},
+        'app/collection1:2': {"id": 2, "value": "new"},
+        'app/collection2:1': {"id": 1, "key": "updated"},
+        'app/collection2:2': None}
+
+    element_cache.cache_provider.full_data = {
+            'app/collection1:1': '{"id": 1, "value": "old"}',
+            'app/collection2:1': '{"id": 1, "key": "old"}',
+            'app/collection2:2': '{"id": 2, "key": "old"}'}
+
+    result = await element_cache.change_elements(input_data)
+
+    assert result == 1  # first change_id
+    assert decode_dict(element_cache.cache_provider.full_data) == decode_dict({
+        'app/collection1:1': '{"id": 1, "value": "updated"}',
+        'app/collection1:2': '{"id": 2, "value": "new"}',
+        'app/collection2:1': '{"id": 1, "key": "updated"}'})
+    assert element_cache.cache_provider.change_id_data == {
+        1: {
+            'app/collection1:1',
+            'app/collection1:2',
+            'app/collection2:1',
+            'app/collection2:2'}}
+
+
+@pytest.mark.asyncio
+async def test_change_elements_with_no_data_in_redis(element_cache):
+    input_data = {
+        'app/collection1:1': {"id": 1, "value": "updated"},
+        'app/collection1:2': {"id": 2, "value": "new"},
+        'app/collection2:1': {"id": 1, "key": "updated"},
+        'app/collection2:2': None}
+
+    result = await element_cache.change_elements(input_data)
+
+    assert result == 1  # first change_id
+    assert decode_dict(element_cache.cache_provider.full_data) == decode_dict({
+        'app/collection1:1': '{"id": 1, "value": "updated"}',
+        'app/collection1:2': '{"id": 2, "value": "new"}',
+        'app/collection2:1': '{"id": 1, "key": "updated"}'})
+    assert element_cache.cache_provider.change_id_data == {
+        1: {
+            'app/collection1:1',
+            'app/collection1:2',
+            'app/collection2:1',
+            'app/collection2:2'}}
+
+
+@pytest.mark.asyncio
+async def test_get_all_full_data_from_db(element_cache):
+    result = await element_cache.get_all_full_data()
+
+    assert result == example_data()
+    # Test that elements are written to redis
+    assert decode_dict(element_cache.cache_provider.full_data) == decode_dict({
+        'app/collection1:1': '{"id": 1, "value": "value1"}',
+        'app/collection1:2': '{"id": 2, "value": "value2"}',
+        'app/collection2:1': '{"id": 1, "key": "value1"}',
+        'app/collection2:2': '{"id": 2, "key": "value2"}'})
+
+
+@pytest.mark.asyncio
+async def test_get_all_full_data_from_redis(element_cache):
+    element_cache.cache_provider.full_data = {
+        'app/collection1:1': '{"id": 1, "value": "value1"}',
+        'app/collection1:2': '{"id": 2, "value": "value2"}',
+        'app/collection2:1': '{"id": 1, "key": "value1"}',
+        'app/collection2:2': '{"id": 2, "key": "value2"}'}
+
+    result = await element_cache.get_all_full_data()
+
+    # The output from redis has to be the same then the db_data
+    assert sort_dict(result) == sort_dict(example_data())
+
+
+@pytest.mark.asyncio
+async def test_get_full_data_change_id_0(element_cache):
+    element_cache.cache_provider.full_data = {
+        'app/collection1:1': '{"id": 1, "value": "value1"}',
+        'app/collection1:2': '{"id": 2, "value": "value2"}',
+        'app/collection2:1': '{"id": 1, "key": "value1"}',
+        'app/collection2:2': '{"id": 2, "key": "value2"}'}
+
+    result = await element_cache.get_full_data(0)
+
+    assert sort_dict(result[0]) == sort_dict(example_data())
+
+
+@pytest.mark.asyncio
+async def test_get_full_data_change_id_lower_then_in_redis(element_cache):
+    element_cache.cache_provider.full_data = {
+        'app/collection1:1': '{"id": 1, "value": "value1"}',
+        'app/collection1:2': '{"id": 2, "value": "value2"}',
+        'app/collection2:1': '{"id": 1, "key": "value1"}',
+        'app/collection2:2': '{"id": 2, "key": "value2"}'}
+    element_cache.cache_provider.change_id_data = {
+        2: {'app/collection1:1'}}
+    with pytest.raises(RuntimeError):
+        await element_cache.get_full_data(1)
+
+
+@pytest.mark.asyncio
+async def test_get_full_data_change_id_data_in_redis(element_cache):
+    element_cache.cache_provider.full_data = {
+        'app/collection1:1': '{"id": 1, "value": "value1"}',
+        'app/collection1:2': '{"id": 2, "value": "value2"}',
+        'app/collection2:1': '{"id": 1, "key": "value1"}',
+        'app/collection2:2': '{"id": 2, "key": "value2"}'}
+    element_cache.cache_provider.change_id_data = {
+        1: {'app/collection1:1', 'app/collection1:3'}}
+
+    result = await element_cache.get_full_data(1)
+
+    assert result == (
+        {'app/collection1': [{"id": 1, "value": "value1"}]},
+        ['app/collection1:3'])
+
+
+@pytest.mark.asyncio
+async def test_get_full_data_change_id_data_in_db(element_cache):
+    element_cache.cache_provider.change_id_data = {
+        1: {'app/collection1:1', 'app/collection1:3'}}
+
+    result = await element_cache.get_full_data(1)
+
+    assert result == (
+        {'app/collection1': [{"id": 1, "value": "value1"}]},
+        ['app/collection1:3'])
+
+
+@pytest.mark.asyncio
+async def test_get_full_data_change_id_data_in_db_empty_change_id(element_cache):
+    with pytest.raises(RuntimeError):
+        await element_cache.get_full_data(1)
+
+
+@pytest.mark.asyncio
+async def test_get_element_full_data_empty_redis(element_cache):
+    result = await element_cache.get_element_full_data('app/collection1', 1)
+
+    assert result == {'id': 1, 'value': 'value1'}
+
+
+@pytest.mark.asyncio
+async def test_get_element_full_data_empty_redis_does_not_exist(element_cache):
+    result = await element_cache.get_element_full_data('app/collection1', 3)
+
+    assert result is None
+
+
+@pytest.mark.asyncio
+async def test_get_element_full_data_full_redis(element_cache):
+    element_cache.cache_provider.full_data = {
+        'app/collection1:1': '{"id": 1, "value": "value1"}',
+        'app/collection1:2': '{"id": 2, "value": "value2"}',
+        'app/collection2:1': '{"id": 1, "key": "value1"}',
+        'app/collection2:2': '{"id": 2, "key": "value2"}'}
+
+    result = await element_cache.get_element_full_data('app/collection1', 1)
+
+    assert result == {'id': 1, 'value': 'value1'}
+
+
+@pytest.mark.asyncio
+async def test_exist_restricted_data(element_cache):
+    element_cache.use_restricted_data_cache = True
+    element_cache.cache_provider.restricted_data = {0: {
+        'app/collection1:1': '{"id": 1, "value": "value1"}',
+        'app/collection1:2': '{"id": 2, "value": "value2"}',
+        'app/collection2:1': '{"id": 1, "key": "value1"}',
+        'app/collection2:2': '{"id": 2, "key": "value2"}'}}
+
+    result = await element_cache.exists_restricted_data(None)
+
+    assert result
+
+
+@pytest.mark.asyncio
+async def test_exist_restricted_data_do_not_use_restricted_data(element_cache):
+    element_cache.use_restricted_data_cache = False
+    element_cache.cache_provider.restricted_data = {0: {
+        'app/collection1:1': '{"id": 1, "value": "value1"}',
+        'app/collection1:2': '{"id": 2, "value": "value2"}',
+        'app/collection2:1': '{"id": 1, "key": "value1"}',
+        'app/collection2:2': '{"id": 2, "key": "value2"}'}}
+
+    result = await element_cache.exists_restricted_data(None)
+
+    assert not result
+
+
+@pytest.mark.asyncio
+async def test_del_user(element_cache):
+    element_cache.use_restricted_data_cache = True
+    element_cache.cache_provider.restricted_data = {0: {
+        'app/collection1:1': '{"id": 1, "value": "value1"}',
+        'app/collection1:2': '{"id": 2, "value": "value2"}',
+        'app/collection2:1': '{"id": 1, "key": "value1"}',
+        'app/collection2:2': '{"id": 2, "key": "value2"}'}}
+
+    await element_cache.del_user(None)
+
+    assert not element_cache.cache_provider.restricted_data
+
+
+@pytest.mark.asyncio
+async def test_del_user_for_empty_user(element_cache):
+    element_cache.use_restricted_data_cache = True
+
+    await element_cache.del_user(None)
+
+    assert not element_cache.cache_provider.restricted_data
+
+
+@pytest.mark.asyncio
+async def test_update_restricted_data(element_cache):
+    element_cache.use_restricted_data_cache = True
+
+    await element_cache.update_restricted_data(None)
+
+    assert decode_dict(element_cache.cache_provider.restricted_data[0]) == decode_dict({
+        'app/collection1:1': '{"id": 1, "value": "restricted_value1"}',
+        'app/collection1:2': '{"id": 2, "value": "restricted_value2"}',
+        'app/collection2:1': '{"id": 1, "key": "restricted_value1"}',
+        'app/collection2:2': '{"id": 2, "key": "restricted_value2"}',
+        '_config:change_id': '0'})
+    # Make sure the lock is deleted
+    assert not await element_cache.cache_provider.get_lock_restricted_data(0)
+    # And the future is done
+    assert element_cache.restricted_data_cache_updater[0].done()
+
+
+@pytest.mark.asyncio
+async def test_update_restricted_data_disabled_restricted_data(element_cache):
+    element_cache.use_restricted_data_cache = False
+
+    await element_cache.update_restricted_data(None)
+
+    assert not element_cache.cache_provider.restricted_data
+
+
+@pytest.mark.asyncio
+async def test_update_restricted_data_to_low_change_id(element_cache):
+    element_cache.use_restricted_data_cache = True
+    element_cache.cache_provider.restricted_data[0] = {
+        '_config:change_id': '1'}
+    element_cache.cache_provider.change_id_data = {
+        3: {'app/collection1:1'}}
+
+    await element_cache.update_restricted_data(None)
+
+    assert decode_dict(element_cache.cache_provider.restricted_data[0]) == decode_dict({
+        'app/collection1:1': '{"id": 1, "value": "restricted_value1"}',
+        'app/collection1:2': '{"id": 2, "value": "restricted_value2"}',
+        'app/collection2:1': '{"id": 1, "key": "restricted_value1"}',
+        'app/collection2:2': '{"id": 2, "key": "restricted_value2"}',
+        '_config:change_id': '3'})
+
+
+@pytest.mark.asyncio
+async def test_update_restricted_data_with_same_id(element_cache):
+    element_cache.use_restricted_data_cache = True
+    element_cache.cache_provider.restricted_data[0] = {
+        '_config:change_id': '1'}
+    element_cache.cache_provider.change_id_data = {
+        1: {'app/collection1:1'}}
+
+    await element_cache.update_restricted_data(None)
+
+    # Same id means, there is nothing to do
+    assert element_cache.cache_provider.restricted_data[0] == {
+        '_config:change_id': '1'}
+
+
+@pytest.mark.asyncio
+async def test_update_restricted_data_with_deleted_elements(element_cache):
+    element_cache.use_restricted_data_cache = True
+    element_cache.cache_provider.restricted_data[0] = {
+        'app/collection1:3': '{"id": 1, "value": "restricted_value1"}',
+        '_config:change_id': '1'}
+    element_cache.cache_provider.change_id_data = {
+        2: {'app/collection1:3'}}
+
+    await element_cache.update_restricted_data(None)
+
+    assert element_cache.cache_provider.restricted_data[0] == {
+        '_config:change_id': '2'}
+
+
+@pytest.mark.asyncio
+async def test_update_restricted_data_second_worker_on_different_server(element_cache):
+    """
+    Test, that if another worker is updating the data, noting is done.
+
+    This tests makes use of the redis key as it would on different daphne servers.
+    """
+    element_cache.use_restricted_data_cache = True
+    element_cache.cache_provider.restricted_data = {0: {}}
+    await element_cache.cache_provider.set_lock_restricted_data(0)
+    await element_cache.cache_provider.del_lock_restricted_data_after_wait(0)
+
+    await element_cache.update_restricted_data(None)
+
+    # Restricted_data_should not be set on second worker
+    assert element_cache.cache_provider.restricted_data == {0: {}}
+
+
+@pytest.mark.asyncio
+async def test_update_restricted_data_second_worker_on_same_server(element_cache):
+    """
+    Test, that if another worker is updating the data, noting is done.
+
+    This tests makes use of the future as it would on the same daphne server.
+    """
+    element_cache.use_restricted_data_cache = True
+    element_cache.cache_provider.restricted_data = {0: {}}
+    future = asyncio.Future()  # type: asyncio.Future
+    element_cache.restricted_data_cache_updater[0] = future
+    await element_cache.cache_provider.set_lock_restricted_data(0)
+    await element_cache.cache_provider.del_lock_restricted_data_after_wait(0, future)
+
+    await element_cache.update_restricted_data(None)
+
+    # Restricted_data_should not be set on second worker
+    assert element_cache.cache_provider.restricted_data == {0: {}}
+
+
+@pytest.mark.asyncio
+async def test_get_all_restricted_data(element_cache):
+    element_cache.use_restricted_data_cache = True
+
+    result = await element_cache.get_all_restricted_data(None)
+
+    assert sort_dict(result) == sort_dict({
+        'app/collection1': [{"id": 1, "value": "restricted_value1"}, {"id": 2, "value": "restricted_value2"}],
+        'app/collection2': [{"id": 1, "key": "restricted_value1"}, {"id": 2, "key": "restricted_value2"}]})
+
+
+@pytest.mark.asyncio
+async def test_get_all_restricted_data_disabled_restricted_data_cache(element_cache):
+    element_cache.use_restricted_data_cache = False
+    result = await element_cache.get_all_restricted_data(None)
+
+    assert sort_dict(result) == sort_dict({
+        'app/collection1': [{"id": 1, "value": "restricted_value1"}, {"id": 2, "value": "restricted_value2"}],
+        'app/collection2': [{"id": 1, "key": "restricted_value1"}, {"id": 2, "key": "restricted_value2"}]})
+
+
+@pytest.mark.asyncio
+async def test_get_restricted_data_change_id_0(element_cache):
+    element_cache.use_restricted_data_cache = True
+
+    result = await element_cache.get_restricted_data(None, 0)
+
+    assert sort_dict(result[0]) == sort_dict({
+        'app/collection1': [{"id": 1, "value": "restricted_value1"}, {"id": 2, "value": "restricted_value2"}],
+        'app/collection2': [{"id": 1, "key": "restricted_value1"}, {"id": 2, "key": "restricted_value2"}]})
+
+
+@pytest.mark.asyncio
+async def test_get_restricted_data_disabled_restricted_data_cache(element_cache):
+    element_cache.use_restricted_data_cache = False
+    element_cache.cache_provider.change_id_data = {1: {'app/collection1:1', 'app/collection1:3'}}
+
+    result = await element_cache.get_restricted_data(None, 1)
+
+    assert result == (
+        {'app/collection1': [{"id": 1, "value": "restricted_value1"}]},
+        ['app/collection1:3'])
+
+
+@pytest.mark.asyncio
+async def test_get_restricted_data_change_id_lower_then_in_redis(element_cache):
+    element_cache.use_restricted_data_cache = True
+    element_cache.cache_provider.change_id_data = {2: {'app/collection1:1'}}
+
+    with pytest.raises(RuntimeError):
+        await element_cache.get_restricted_data(None, 1)
+
+
+@pytest.mark.asyncio
+async def test_get_restricted_data_change_with_id(element_cache):
+    element_cache.use_restricted_data_cache = True
+    element_cache.cache_provider.change_id_data = {2: {'app/collection1:1'}}
+
+    result = await element_cache.get_restricted_data(None, 2)
+
+    assert result == ({'app/collection1': [{"id": 1, "value": "restricted_value1"}]}, [])
+
+
+@pytest.mark.asyncio
+async def test_lowest_change_id_after_updating_lowest_element(element_cache):
+    await element_cache.change_elements({'app/collection1:1': {"id": 1, "value": "updated1"}})
+    first_lowest_change_id = await element_cache.get_lowest_change_id()
+    # Alter same element again
+    await element_cache.change_elements({'app/collection1:1': {"id": 1, "value": "updated2"}})
+    second_lowest_change_id = await element_cache.get_lowest_change_id()
+
+    assert first_lowest_change_id == 1
+    assert second_lowest_change_id == 1  # The lowest_change_id should not change