59 lines
2.1 KiB
Python
59 lines
2.1 KiB
Python
import asyncio
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import json
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import logging
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from typing import Any, AsyncGenerator, Dict, Set
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logger = logging.getLogger(__name__)
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class RunEventPublisher:
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def __init__(self) -> None:
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# Maps run_id to a set of subscriber queues
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self._subscribers: Dict[int, Set[asyncio.Queue]] = {}
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def subscribe(self, run_id: int) -> asyncio.Queue:
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if run_id not in self._subscribers:
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self._subscribers[run_id] = set()
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queue: asyncio.Queue[Any] = asyncio.Queue()
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self._subscribers[run_id].add(queue)
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logger.debug(f"New subscriber for run {run_id}. Total: {len(self._subscribers[run_id])}")
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return queue
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def unsubscribe(self, run_id: int, queue: asyncio.Queue) -> None:
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if run_id in self._subscribers:
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self._subscribers[run_id].discard(queue)
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if not self._subscribers[run_id]:
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self._subscribers.pop(run_id, None)
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async def publish(self, run_id: int, event_type: str, data: dict[str, Any]) -> None:
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if run_id not in self._subscribers:
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return
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message = {
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"type": event_type,
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"data": data
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}
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# Fan-out to all active subscribers for this run
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for queue in list(self._subscribers[run_id]):
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try:
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queue.put_nowait(message)
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except asyncio.QueueFull:
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logger.warning(f"Subscriber queue full for run {run_id}, dropping message")
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run_events = RunEventPublisher()
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async def event_generator(run_id: int) -> AsyncGenerator[str, None]:
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queue = run_events.subscribe(run_id)
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try:
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while True:
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# Wait for a new event
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message = await queue.get()
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# Server-Sent Events format: "event: <type>\ndata: <json>\n\n"
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event_type = message["type"]
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data_str = json.dumps(message["data"])
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yield f"event: {event_type}\ndata: {data_str}\n\n"
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except asyncio.CancelledError:
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logger.debug(f"Client disconnected from SSE stream for run {run_id}")
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raise
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finally:
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run_events.unsubscribe(run_id, queue)
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