66 lines
1.9 KiB
Python
66 lines
1.9 KiB
Python
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"""Redis Pub/Sub helpers for WebSocket multi-worker fanout."""
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from __future__ import annotations
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import asyncio
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import json
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import logging
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import uuid
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from typing import Awaitable, Callable
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from app.core.auth import get_redis
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logger = logging.getLogger(__name__)
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async def publish_to_channel(channel: str, message: dict) -> None:
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"""Publish a JSON message to a Redis channel."""
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redis = get_redis()
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await redis.publish(channel, json.dumps(message, default=str))
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async def subscribe_to_channel(
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channel: str,
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handler: Callable[[dict], Awaitable[None]],
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) -> asyncio.Task:
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"""Subscribe to a Redis channel and call *handler* for every message.
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Returns the :class:`asyncio.Task` so the caller can cancel it on disconnect.
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"""
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async def _subscriber() -> None:
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redis = get_redis()
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pubsub = redis.pubsub()
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await pubsub.subscribe(channel)
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try:
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async for raw in pubsub.listen():
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if raw["type"] == "message":
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try:
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msg = json.loads(raw["data"])
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await handler(msg)
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except Exception:
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logger.exception("Error in pubsub handler for channel %s", channel)
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finally:
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try:
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await pubsub.unsubscribe(channel)
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await pubsub.aclose()
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except Exception:
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logger.debug("PubSub cleanup error for channel %s", channel)
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return asyncio.create_task(_subscriber())
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def get_tenant_channel(tenant_id: uuid.UUID, topic: str) -> str:
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"""Return the Redis channel name for a tenant + topic."""
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return f"ws:{tenant_id}:{topic}"
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async def broadcast_to_tenants(
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tenant_id: uuid.UUID,
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topic: str,
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message: dict,
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) -> None:
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"""Publish a message to a tenant-specific Redis channel."""
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channel = get_tenant_channel(tenant_id, topic)
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await publish_to_channel(channel, message)
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