2016-03-02 00:46:19 +01:00
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import json
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2017-01-15 11:55:14 +01:00
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import time
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import warnings
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2017-04-19 22:58:48 +02:00
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from collections import Iterable, defaultdict
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2017-08-24 12:26:55 +02:00
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from typing import Any, Dict, Iterable, List, cast # noqa
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2015-01-18 15:53:03 +01:00
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2016-05-29 08:29:14 +02:00
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from channels import Channel, Group
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2017-01-15 11:55:14 +01:00
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from channels.asgi import get_channel_layer
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2016-05-29 08:29:14 +02:00
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from channels.auth import channel_session_user, channel_session_user_from_http
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2017-02-12 14:09:53 +01:00
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from django.core.exceptions import ObjectDoesNotExist
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2016-08-08 07:48:11 +02:00
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from django.db import transaction
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2017-08-24 12:26:55 +02:00
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from django.db.models import Model
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2016-01-10 00:17:00 +01:00
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2016-09-17 22:26:23 +02:00
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from ..core.config import config
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from ..core.models import Projector
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2017-06-10 09:25:27 +02:00
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from .auth import anonymous_is_enabled, has_perm, user_to_collection_user
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2017-05-01 23:12:42 +02:00
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from .cache import startup_cache, websocket_user_cache
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from .collection import Collection, CollectionElement, CollectionElementList
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2013-02-27 18:22:24 +01:00
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2015-01-17 14:01:44 +01:00
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2017-08-24 12:26:55 +02:00
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def send_or_wait(send_func: Any, *args: Any, **kwargs: Any) -> None:
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2017-01-15 11:55:14 +01:00
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"""
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Wrapper for channels' send() method.
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If the method send() raises ChannelFull exception the worker waits for 20
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milliseconds and tries again. After 5 secondes it gives up, drops the
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channel message and writes a warning to stderr.
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Django channels' consumer atomicity feature is disabled.
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"""
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kwargs['immediately'] = True
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for i in range(250):
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try:
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send_func(*args, **kwargs)
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except get_channel_layer().ChannelFull:
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time.sleep(0.02)
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else:
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break
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else:
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warnings.warn(
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'Channel layer is full. Channel message dropped.',
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RuntimeWarning
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)
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2017-08-24 12:26:55 +02:00
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def format_for_autoupdate(collection_string: str, id: int, action: str, data: Dict[str, Any]=None) -> Dict[str, Any]:
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2017-05-01 23:12:42 +02:00
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"""
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Returns a dict that can be used for autoupdate.
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"""
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if not data:
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# If the data is None or is empty, then the action has to be deleted,
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# even when it says diffrently. This can happen when the object is not
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# deleted, but the user has no permission to see it.
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action = 'deleted'
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output = {
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'collection': collection_string,
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'id': id,
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'action': action,
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}
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if action != 'deleted':
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output['data'] = data
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return output
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2016-05-29 08:29:14 +02:00
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@channel_session_user_from_http
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2017-08-24 12:26:55 +02:00
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def ws_add_site(message: Any) -> None:
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2016-05-29 08:29:14 +02:00
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"""
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Adds the websocket connection to a group specific to the connecting user.
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2013-12-09 18:03:47 +01:00
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2016-05-29 08:29:14 +02:00
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The group with the name 'user-None' stands for all anonymous users.
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2017-01-14 12:29:42 +01:00
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2017-01-14 13:02:26 +01:00
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Send all "startup-data" through the connection.
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2016-05-29 08:29:14 +02:00
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"""
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2017-06-10 09:25:27 +02:00
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if not anonymous_is_enabled() and not message.user.id:
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send_or_wait(message.reply_channel.send, {'accept': False})
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return
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2016-12-17 09:30:20 +01:00
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Group('site').add(message.reply_channel)
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message.channel_session['user_id'] = message.user.id
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# Saves the reply channel to the user. Uses 0 for anonymous users.
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websocket_user_cache.add(message.user.id or 0, message.reply_channel.name)
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2017-01-14 12:29:42 +01:00
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2017-04-25 14:56:49 +02:00
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# Open the websocket connection.
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send_or_wait(message.reply_channel.send, {'accept': True})
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2017-01-14 12:29:42 +01:00
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# Collect all elements that shoud be send to the client when the websocket
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2017-05-01 23:12:42 +02:00
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# connection is established.
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2017-04-28 00:50:37 +02:00
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user = user_to_collection_user(message.user.id)
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2017-01-14 12:29:42 +01:00
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output = []
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2017-05-01 23:12:42 +02:00
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for collection in startup_cache.get_collections():
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access_permissions = collection.get_access_permissions()
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restricted_data = access_permissions.get_restricted_data(collection, user)
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2017-08-24 12:26:55 +02:00
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# At this point restricted_data has to be a list. So we have to tell it mypy
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restricted_data = cast(List[Dict[str, Any]], restricted_data)
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2017-04-28 00:50:37 +02:00
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for data in restricted_data:
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if data is None:
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2017-05-01 23:12:42 +02:00
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# We do not want to send 'deleted' objects on startup.
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# That's why we skip such data.
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2017-04-28 00:50:37 +02:00
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continue
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output.append(
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format_for_autoupdate(
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2017-05-01 23:12:42 +02:00
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collection_string=collection.collection_string,
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2017-08-24 12:26:55 +02:00
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id=int(data['id']),
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2017-04-28 00:50:37 +02:00
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action='changed',
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data=data))
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2017-01-14 12:29:42 +01:00
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2017-05-01 23:12:42 +02:00
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# Send all data.
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2017-01-14 12:29:42 +01:00
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if output:
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2017-01-15 11:55:14 +01:00
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send_or_wait(message.reply_channel.send, {'text': json.dumps(output)})
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2013-02-27 18:22:24 +01:00
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2015-01-17 14:01:44 +01:00
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2016-05-29 08:29:14 +02:00
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@channel_session_user
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2017-08-24 12:26:55 +02:00
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def ws_disconnect_site(message: Any) -> None:
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2016-09-17 22:26:23 +02:00
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"""
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This function is called, when a client on the site disconnects.
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"""
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2016-12-17 09:30:20 +01:00
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Group('site').discard(message.reply_channel)
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websocket_user_cache.remove(message.user.id or 0, message.reply_channel.name)
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2016-01-10 00:17:00 +01:00
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2015-01-17 14:01:44 +01:00
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2017-04-19 22:58:48 +02:00
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@channel_session_user
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2017-08-24 12:26:55 +02:00
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def ws_receive_site(message: Any) -> None:
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2017-04-19 22:58:48 +02:00
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"""
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This function is called if a message from a client comes in. The message
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should be a list. Every item is broadcasted to the given users (or all
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users if no user list is given) if it is a notify element.
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The server adds the sender's user id (0 for anonymous) and reply
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channel name so that a receiver client may reply to the sender or to all
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sender's instances.
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"""
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try:
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incomming = json.loads(message.content['text'])
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except ValueError:
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# Message content is invalid. Just do nothing.
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pass
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else:
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if isinstance(incomming, list):
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# Parse all items
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2017-08-24 12:26:55 +02:00
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receivers_users = defaultdict(list) # type: Dict[int, List[Any]]
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receivers_reply_channels = defaultdict(list) # type: Dict[str, List[Any]]
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2017-04-19 22:58:48 +02:00
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items_for_all = []
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for item in incomming:
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if item.get('collection') == 'notify':
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use_receivers_dict = False
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item['senderReplyChannelName'] = message.reply_channel.name
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item['senderUserId'] = message.user.id or 0
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2017-04-20 11:21:24 +02:00
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# Force the params to be a dict
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if not isinstance(item.get('params'), dict):
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item['params'] = {}
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2017-04-19 22:58:48 +02:00
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users = item.get('users')
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if isinstance(users, list):
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# Send this item only to all reply channels of some site users.
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for user_id in users:
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receivers_users[user_id].append(item)
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use_receivers_dict = True
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reply_channels = item.get('replyChannels')
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if isinstance(reply_channels, list):
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# Send this item only to some reply channels.
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for reply_channel_name in reply_channels:
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receivers_reply_channels[reply_channel_name].append(item)
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use_receivers_dict = True
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if not use_receivers_dict:
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# Send this item to all reply channels.
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items_for_all.append(item)
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# Send all items
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for user_id, channel_names in websocket_user_cache.get_all().items():
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output = receivers_users[user_id]
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if len(output) > 0:
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for channel_name in channel_names:
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send_or_wait(Channel(channel_name).send, {'text': json.dumps(output)})
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for channel_name, output in receivers_reply_channels.items():
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if len(output) > 0:
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send_or_wait(Channel(channel_name).send, {'text': json.dumps(output)})
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if len(items_for_all) > 0:
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send_or_wait(Group('site').send, {'text': json.dumps(items_for_all)})
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2016-09-17 22:26:23 +02:00
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@channel_session_user_from_http
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2017-08-24 12:26:55 +02:00
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def ws_add_projector(message: Any, projector_id: int) -> None:
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2015-01-17 14:01:44 +01:00
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"""
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2016-09-17 22:26:23 +02:00
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Adds the websocket connection to a group specific to the projector with the given id.
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Also sends all data that are shown on the projector.
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2015-01-17 14:01:44 +01:00
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"""
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2017-08-24 12:26:55 +02:00
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user = user_to_collection_user(message.user.id)
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2016-09-17 22:26:23 +02:00
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2017-01-26 15:34:24 +01:00
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if not has_perm(user, 'core.can_see_projector'):
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2017-01-15 11:55:14 +01:00
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send_or_wait(message.reply_channel.send, {'text': 'No permissions to see this projector.'})
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2015-01-17 14:01:44 +01:00
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else:
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2016-09-17 22:26:23 +02:00
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try:
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projector = Projector.objects.get(pk=projector_id)
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except Projector.DoesNotExist:
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2017-01-15 11:55:14 +01:00
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send_or_wait(message.reply_channel.send, {'text': 'The projector {} does not exist.'.format(projector_id)})
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2016-09-17 22:26:23 +02:00
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else:
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# At first, the client is added to the projector group, so it is
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# informed if the data change.
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Group('projector-{}'.format(projector_id)).add(message.reply_channel)
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2016-10-01 12:58:49 +02:00
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# Then it is also added to the global projector group which is
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# used for broadcasting data.
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Group('projector-all').add(message.reply_channel)
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# Now check whether broadcast is active at the moment. If yes,
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# change the local projector variable.
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if config['projector_broadcast'] > 0:
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projector = Projector.objects.get(pk=config['projector_broadcast'])
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# Collect all elements that are on the projector.
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2016-09-30 23:39:42 +02:00
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output = []
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for requirement in projector.get_all_requirements():
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required_collection_element = CollectionElement.from_instance(requirement)
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output.append(required_collection_element.as_autoupdate_for_projector())
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2016-05-29 08:29:14 +02:00
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2016-10-01 12:58:49 +02:00
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# Collect all config elements.
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2016-09-18 16:00:31 +02:00
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collection = Collection(config.get_collection_string())
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output.extend(collection.as_autoupdate_for_projector())
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2016-09-17 22:26:23 +02:00
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2016-10-01 12:58:49 +02:00
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# Collect the projector instance.
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2016-09-17 22:26:23 +02:00
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collection_element = CollectionElement.from_instance(projector)
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output.append(collection_element.as_autoupdate_for_projector())
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2016-10-01 12:58:49 +02:00
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# Send all the data that were only collected before.
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2017-01-15 11:55:14 +01:00
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send_or_wait(message.reply_channel.send, {'text': json.dumps(output)})
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2016-09-17 22:26:23 +02:00
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2017-08-24 12:26:55 +02:00
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def ws_disconnect_projector(message: Any, projector_id: int) -> None:
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2016-09-17 22:26:23 +02:00
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"""
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This function is called, when a client on the projector disconnects.
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"""
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Group('projector-{}'.format(projector_id)).discard(message.reply_channel)
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2017-08-24 12:26:55 +02:00
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def send_data(message: Any) -> None:
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2016-09-17 22:26:23 +02:00
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"""
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2016-09-30 23:39:42 +02:00
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Informs all site users and projector clients about changed data.
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2016-09-17 22:26:23 +02:00
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"""
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2016-10-01 15:26:00 +02:00
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collection_elements = CollectionElementList.from_channels_message(message)
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2017-03-06 16:34:20 +01:00
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# Send data to site users.
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2016-12-17 09:30:20 +01:00
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for user_id, channel_names in websocket_user_cache.get_all().items():
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if not user_id:
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# Anonymous user
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2017-01-26 15:34:24 +01:00
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user = None
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2016-12-17 09:30:20 +01:00
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else:
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2017-02-12 14:09:53 +01:00
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try:
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2017-02-21 09:34:24 +01:00
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user = user_to_collection_user(user_id)
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2017-02-12 14:09:53 +01:00
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except ObjectDoesNotExist:
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# The user does not exist. Skip him/her.
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continue
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2016-10-01 15:26:00 +02:00
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output = collection_elements.as_autoupdate_for_user(user)
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2016-12-17 09:30:20 +01:00
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for channel_name in channel_names:
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2017-01-15 11:55:14 +01:00
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send_or_wait(Channel(channel_name).send, {'text': json.dumps(output)})
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2016-09-18 16:00:31 +02:00
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2016-10-01 12:58:49 +02:00
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# Check whether broadcast is active at the moment and set the local
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# projector queryset.
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if config['projector_broadcast'] > 0:
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queryset = Projector.objects.filter(pk=config['projector_broadcast'])
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else:
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queryset = Projector.objects.all()
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2016-09-30 23:39:42 +02:00
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# Loop over all projectors and send data that they need.
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2016-10-01 12:58:49 +02:00
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for projector in queryset:
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2016-10-01 15:26:00 +02:00
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output = []
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for collection_element in collection_elements:
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if collection_element.is_deleted():
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output.append(collection_element.as_autoupdate_for_projector())
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else:
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for element in projector.get_collection_elements_required_for_this(collection_element):
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2016-10-07 17:02:55 +02:00
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output.append(element.as_autoupdate_for_projector())
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2016-09-17 22:26:23 +02:00
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if output:
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2016-10-01 12:58:49 +02:00
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if config['projector_broadcast'] > 0:
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2017-01-15 11:55:14 +01:00
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send_or_wait(
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|
Group('projector-all').send,
|
2016-10-01 12:58:49 +02:00
|
|
|
{'text': json.dumps(output)})
|
|
|
|
else:
|
2017-01-15 11:55:14 +01:00
|
|
|
send_or_wait(
|
|
|
|
Group('projector-{}'.format(projector.pk)).send,
|
2016-10-01 12:58:49 +02:00
|
|
|
{'text': json.dumps(output)})
|
2016-05-29 08:29:14 +02:00
|
|
|
|
|
|
|
|
2017-08-24 12:26:55 +02:00
|
|
|
def inform_changed_data(instances: Iterable[Model], information: Dict[str, Any]=None) -> None:
|
2016-09-18 16:00:31 +02:00
|
|
|
"""
|
|
|
|
Informs the autoupdate system and the caching system about the creation or
|
|
|
|
update of an element.
|
2016-10-01 15:26:00 +02:00
|
|
|
|
|
|
|
The argument instances can be one instance or an interable over instances.
|
2016-09-18 16:00:31 +02:00
|
|
|
"""
|
2016-10-01 15:26:00 +02:00
|
|
|
root_instances = set()
|
|
|
|
if not isinstance(instances, Iterable):
|
2016-10-14 21:48:02 +02:00
|
|
|
# Make sure instances is an iterable
|
2016-10-01 15:26:00 +02:00
|
|
|
instances = (instances, )
|
|
|
|
for instance in instances:
|
|
|
|
try:
|
|
|
|
root_instances.add(instance.get_root_rest_element())
|
|
|
|
except AttributeError:
|
|
|
|
# Instance has no method get_root_rest_element. Just ignore it.
|
|
|
|
pass
|
|
|
|
|
|
|
|
# Generates an collection element list for the root_instances.
|
|
|
|
collection_elements = CollectionElementList()
|
|
|
|
for root_instance in root_instances:
|
|
|
|
collection_elements.append(
|
|
|
|
CollectionElement.from_instance(
|
|
|
|
root_instance,
|
|
|
|
information=information))
|
|
|
|
# If currently there is an open database transaction, then the
|
|
|
|
# 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(collection_elements))
|
2015-01-17 14:01:44 +01:00
|
|
|
|
2016-09-30 20:42:58 +02:00
|
|
|
|
2017-08-24 12:26:55 +02:00
|
|
|
# TODO: Change the input argument to tuples
|
|
|
|
def inform_deleted_data(*args: Any, information: Dict[str, Any]=None) -> None:
|
2015-01-17 14:01:44 +01:00
|
|
|
"""
|
2016-09-18 16:00:31 +02:00
|
|
|
Informs the autoupdate system and the caching system about the deletion of
|
2016-10-01 15:26:00 +02:00
|
|
|
elements.
|
|
|
|
|
|
|
|
The function has to be called with the attributes collection_string and id.
|
|
|
|
Multible elements can be used. For example:
|
|
|
|
|
|
|
|
inform_deleted_data('motions/motion', 1, 'assignments/assignment', 5)
|
|
|
|
|
|
|
|
The argument information is added to each collection element.
|
|
|
|
"""
|
|
|
|
if len(args) % 2 or not args:
|
|
|
|
raise ValueError(
|
|
|
|
"inform_deleted_data has to be called with the same number of "
|
|
|
|
"collection strings and ids. It has to be at least one collection "
|
|
|
|
"string and one id.")
|
|
|
|
|
|
|
|
# Go through each pair of collection_string and id and generate a collection
|
|
|
|
# element from it.
|
|
|
|
collection_elements = CollectionElementList()
|
|
|
|
for index in range(0, len(args), 2):
|
|
|
|
collection_elements.append(CollectionElement.from_values(
|
|
|
|
collection_string=args[index],
|
|
|
|
id=args[index + 1],
|
|
|
|
deleted=True,
|
|
|
|
information=information))
|
2016-09-30 20:42:58 +02:00
|
|
|
# If currently there is an open database transaction, then the
|
|
|
|
# send_autoupdate function is only called, when the transaction is
|
|
|
|
# commited. If there is currently no transaction, then the function
|
|
|
|
# is called immediately.
|
2016-10-01 15:26:00 +02:00
|
|
|
transaction.on_commit(lambda: send_autoupdate(collection_elements))
|
2016-02-11 11:29:19 +01:00
|
|
|
|
|
|
|
|
2017-08-24 12:26:55 +02:00
|
|
|
def inform_data_collection_element_list(collection_elements: CollectionElementList,
|
|
|
|
information: Dict[str, Any]=None) -> None:
|
2017-03-06 16:34:20 +01:00
|
|
|
"""
|
|
|
|
Informs the autoupdate system about some collection elements. This is
|
|
|
|
used just to send some data to all users.
|
|
|
|
"""
|
|
|
|
# If currently there is an open database transaction, then the
|
|
|
|
# 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(collection_elements))
|
|
|
|
|
|
|
|
|
2017-08-24 12:26:55 +02:00
|
|
|
def send_autoupdate(collection_elements: CollectionElementList) -> None:
|
2016-02-11 11:29:19 +01:00
|
|
|
"""
|
2016-10-01 15:26:00 +02:00
|
|
|
Helper function, that sends collection_elements through a channel to the
|
2016-09-18 16:00:31 +02:00
|
|
|
autoupdate system.
|
2016-10-01 15:26:00 +02:00
|
|
|
|
2017-05-01 23:12:42 +02:00
|
|
|
Before sending the startup_cache is cleared because it is possibly out of
|
|
|
|
date.
|
|
|
|
|
2016-10-01 15:26:00 +02:00
|
|
|
Does nothing if collection_elements is empty.
|
2016-02-11 11:29:19 +01:00
|
|
|
"""
|
2016-10-01 15:26:00 +02:00
|
|
|
if collection_elements:
|
2017-05-01 23:12:42 +02:00
|
|
|
startup_cache.clear()
|
2017-01-15 11:55:14 +01:00
|
|
|
send_or_wait(
|
|
|
|
Channel('autoupdate.send_data').send,
|
|
|
|
collection_elements.as_channels_message())
|