OpenSlides/openslides/utils/consumers.py
2018-10-29 13:10:15 +01:00

91 lines
3.4 KiB
Python

from collections import defaultdict
from typing import Any, Dict, List
from urllib.parse import parse_qs
from .auth import async_anonymous_is_enabled
from .cache import element_cache, split_element_id
from .collection import AutoupdateFormat
from .websocket import ProtocollAsyncJsonWebsocketConsumer, get_element_data
class SiteConsumer(ProtocollAsyncJsonWebsocketConsumer):
"""
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.
"""
change_id = None
if not await async_anonymous_is_enabled() and self.scope['user'].id is None:
await self.close()
return
query_string = parse_qs(self.scope['query_string'])
if b'change_id' in query_string:
try:
change_id = int(query_string[b'change_id'][0])
except ValueError:
await self.close() # TODO: Find a way to send an error code
return
if b'autoupdate' in query_string and query_string[b'autoupdate'][0].lower() not in [b'0', b'off', b'false']:
# a positive value in autoupdate. Start autoupdate
await self.channel_layer.group_add('autoupdate', self.channel_name)
await self.accept()
if change_id is not None:
data = await get_element_data(self.scope['user'], change_id)
await self.send_json(type='autoupdate', content=data)
async def disconnect(self, close_code: int) -> None:
"""
A user disconnects. Remove it from autoupdate.
"""
await self.channel_layer.group_discard('autoupdate', self.channel_name)
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')
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):
item['senderReplyChannelName'] = event.get('senderReplyChannelName')
item['senderUserId'] = event.get('senderUserId')
out.append(item)
if out:
await self.send_json(type='notify', content=out)
async def send_data(self, event: Dict[str, Any]) -> None:
"""
Send changed or deleted elements to the user.
"""
change_id = event['change_id']
changed_elements, deleted_elements_ids = await element_cache.get_restricted_data(self.scope['user'], change_id, max_change_id=change_id)
deleted_elements: Dict[str, List[int]] = defaultdict(list)
for element_id in deleted_elements_ids:
collection_string, id = split_element_id(element_id)
deleted_elements[collection_string].append(id)
await self.send_json(type='autoupdate', content=AutoupdateFormat(
changed=changed_elements,
deleted=deleted_elements,
from_change_id=change_id,
to_change_id=change_id,
all_data=False))