Subscriptions: stream missing items if user passed an old stoken.

master
Tom Hacohen 4 years ago
parent f52facad1c
commit 61bd82f1e3

@ -2,6 +2,7 @@ import asyncio
import typing as t
import aioredis
from asgiref.sync import sync_to_async
from django.db.models import QuerySet
from fastapi import APIRouter, Depends, WebSocket, WebSocketDisconnect, status
import nacl.encoding
@ -11,6 +12,7 @@ from django_etebase import models
from django_etebase.utils import CallbackContext, get_user_queryset
from myauth.models import UserType, get_typed_user_model
from ..dependencies import get_collection_queryset, get_item_queryset
from ..exceptions import NotSupported
from ..msgpack import MsgpackRoute, msgpack_decode, msgpack_encode
from ..redis import redisw
@ -72,20 +74,49 @@ def get_websocket_user(websocket: WebSocket, ticket_model: t.Optional[TicketInne
@websocket_router.websocket("/{ticket}/")
async def websocket_endpoint(
websocket: WebSocket,
stoken: t.Optional[str],
user: t.Optional[UserType] = Depends(get_websocket_user),
ticket_model: TicketInner = Depends(load_websocket_ticket),
):
if user is None:
return
await websocket.accept()
await redis_connector(websocket, ticket_model)
await redis_connector(websocket, ticket_model, user, stoken)
async def redis_connector(websocket: WebSocket, ticket_model: TicketInner):
async def send_item_updates(
websocket: WebSocket,
collection: models.Collection,
user: UserType,
stoken: t.Optional[str],
):
from .collection import item_list_common
done = False
while not done:
queryset = await sync_to_async(get_item_queryset)(collection)
response = await sync_to_async(item_list_common)(queryset, user, stoken, limit=50, prefetch="auto")
done = response.done
if len(response.data) > 0:
await websocket.send_bytes(msgpack_encode(response.dict()))
async def redis_connector(websocket: WebSocket, ticket_model: TicketInner, user: UserType, stoken: t.Optional[str]):
async def producer_handler(r: aioredis.Redis, ws: WebSocket):
channel_name = f"col.{ticket_model.req.collection}"
(channel,) = await r.psubscribe(channel_name)
assert isinstance(channel, aioredis.Channel)
# Send missing items if we are not up to date
queryset: QuerySet[models.Collection] = get_collection_queryset(user)
collection: t.Optional[models.Collection] = await sync_to_async(
queryset.filter(uid=ticket_model.req.collection).first
)()
if collection is None:
await websocket.close(code=status.WS_1008_POLICY_VIOLATION)
return
await send_item_updates(websocket, collection, user, stoken)
try:
while True:
# We wait on the websocket so we fail if web sockets fail or get data

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