74 lines
2.0 KiB
Python
74 lines
2.0 KiB
Python
"""
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SSE endpoint for chunker pipeline events.
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Uses Redis as the event bus. Pipeline pushes events via core.events,
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SSE endpoint polls them.
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GET /chunker/stream/{job_id} → text/event-stream
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"""
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import asyncio
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import json
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import logging
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import time
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from typing import AsyncGenerator
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from fastapi import APIRouter
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from starlette.responses import StreamingResponse
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from core.events import poll_events
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logger = logging.getLogger(__name__)
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router = APIRouter(prefix="/chunker", tags=["chunker"])
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async def _event_generator(job_id: str) -> AsyncGenerator[str, None]:
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"""
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Generate SSE events by polling Redis for chunk job events.
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"""
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cursor = 0
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timeout = time.monotonic() + 600 # 10 min max
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while time.monotonic() < timeout:
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events, cursor = poll_events(job_id, cursor)
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if not events:
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yield f"event: waiting\ndata: {json.dumps({'job_id': job_id})}\n\n"
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await asyncio.sleep(0.1)
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continue
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for data in events:
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event_type = data.pop("event", "update")
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payload = {**data, "job_id": job_id}
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yield f"event: {event_type}\ndata: {json.dumps(payload)}\n\n"
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if event_type in ("pipeline_complete", "pipeline_error", "cancelled"):
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yield f"event: done\ndata: {json.dumps({'job_id': job_id})}\n\n"
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return
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await asyncio.sleep(0.05)
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yield f"event: timeout\ndata: {json.dumps({'job_id': job_id})}\n\n"
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@router.get("/stream/{job_id}")
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async def stream_chunk_job(job_id: str):
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"""
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SSE stream for a chunk pipeline job.
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The UI connects via native EventSource:
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const es = new EventSource('/api/chunker/stream/<job_id>');
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es.addEventListener('processing', (e) => { ... });
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"""
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return StreamingResponse(
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_event_generator(job_id),
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media_type="text/event-stream",
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headers={
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"Cache-Control": "no-cache",
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"Connection": "keep-alive",
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"X-Accel-Buffering": "no",
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},
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)
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