OpenSlides/openslides/utils/consumers.py

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from collections import defaultdict
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from typing import Any, Dict, List
from urllib.parse import parse_qs
from .auth import async_anonymous_is_enabled
from .autoupdate import AutoupdateFormat
from .cache import element_cache, split_element_id
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from .websocket import ProtocollAsyncJsonWebsocketConsumer, get_element_data
class SiteConsumer(ProtocollAsyncJsonWebsocketConsumer):
"""
Websocket Consumer for the site.
"""
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groups = ["site"]
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def __init__(self, *args: Any, **kwargs: Any) -> None:
self.projector_hash: Dict[int, int] = {}
super().__init__(*args, **kwargs)
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.
"""
# self.scope['user'] is the full_data dict of the user. For an
# anonymous user is it the dict {'id': 0}
change_id = None
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if not await async_anonymous_is_enabled() and not self.scope["user"]["id"]:
await self.close()
return
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query_string = parse_qs(self.scope["query_string"])
if b"change_id" in query_string:
try:
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change_id = int(query_string[b"change_id"][0])
except ValueError:
await self.close() # TODO: Find a way to send an error code
return
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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
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await self.channel_layer.group_add("autoupdate", self.channel_name)
await self.accept()
if change_id is not None:
try:
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data = await get_element_data(self.scope["user"]["id"], change_id)
except ValueError:
# When the change_id is to big, do nothing
pass
else:
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await self.send_json(type="autoupdate", content=data)
async def disconnect(self, close_code: int) -> None:
"""
A user disconnects. Remove it from autoupdate.
"""
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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.
"""
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user_id = self.scope["user"]["id"]
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item = event["incomming"]
users = item.get("users")
reply_channels = item.get("replyChannels")
if (
(isinstance(users, bool) and users)
or (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["senderChannelName"] = event["senderChannelName"]
item["senderUserId"] = event["senderUserId"]
await self.send_json(type="notify", content=item)
async def send_data(self, event: Dict[str, Any]) -> None:
"""
Send changed or deleted elements to the user.
"""
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change_id = event["change_id"]
changed_elements, deleted_elements_ids = await element_cache.get_restricted_data(
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self.scope["user"]["id"], change_id, max_change_id=change_id
)
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deleted_elements: Dict[str, List[int]] = defaultdict(list)
for element_id in deleted_elements_ids:
collection_string, id = split_element_id(element_id)
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deleted_elements[collection_string].append(id)
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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,
),
)
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async def projector_changed(self, event: Dict[str, Any]) -> None:
"""
The projector has changed.
"""
all_projector_data = event["data"]
projector_data: Dict[int, Dict[str, Any]] = {}
for projector_id in self.listen_projector_ids:
data = all_projector_data.get(
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projector_id, {"error": f"No data for projector {projector_id}"}
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)
new_hash = hash(str(data))
if new_hash != self.projector_hash[projector_id]:
projector_data[projector_id] = data
self.projector_hash[projector_id] = new_hash
if projector_data:
await self.send_json(type="projector", content=projector_data)