kplam
51dc8dc4f6
- FastAPI + Qdrant + Redis + Ollama 技术栈 - L1→L2→L3→chunk 四层分层检索（dense + sparse RRF 融合） - 文档三级总结与 2.5 级回退 - query 解析路由与分类 - /admin 管理页面
173 lines
7.2 KiB
Python
173 lines
7.2 KiB
Python
"""入库异步任务管理器
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将文档入库包装为后台异步任务：submit 登记任务并立即返回 task_id，
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后台受并发上限控制执行 Ingester.ingest，并按阶段推进任务状态。
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内存注册表为主（记录 status/created_at/updated_at/result/error），
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Redis 为持久镜像（key: ingest_task:{task_id}），每次状态迁移同步写入；
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Redis 不可用或写入失败仅记录 warning，不影响任务执行。
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"""
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import asyncio
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import uuid
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from datetime import UTC, datetime
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from enum import StrEnum
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from typing import Any
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import structlog
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from app.config import Settings
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from app.core.ingestion import Ingester, IngestionError
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from app.models.document import DocumentInput
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from app.services.redis import RedisCache
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logger = structlog.get_logger()
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# Redis 任务状态 key 前缀
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REDIS_KEY_PREFIX = "ingest_task:"
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class IngestTaskStatus(StrEnum):
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"""入库任务状态"""
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PENDING = "pending" # 已登记，排队等待执行
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SUMMARIZING = "summarizing" # 三级总结中
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CLASSIFYING = "classifying" # 分类判定中
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EMBEDDING = "embedding" # 向量化中
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WRITING = "writing" # 写入 Qdrant 中
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DONE = "done" # 入库完成
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FAILED = "failed" # 入库失败
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# 终态集合
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TERMINAL_STATUSES: frozenset[str] = frozenset({IngestTaskStatus.DONE, IngestTaskStatus.FAILED})
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def _utc_now_iso() -> str:
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"""当前 UTC 时间的 ISO8601 字符串"""
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return datetime.now(UTC).isoformat()
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class IngestTaskManager:
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"""入库异步任务管理器：登记、后台执行、状态查询与 Redis 持久镜像"""
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def __init__(self, ingester: Ingester, redis: RedisCache | None, settings: Settings) -> None:
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self._ingester = ingester
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self._redis = redis
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self._settings = settings
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self._tasks: dict[str, dict[str, Any]] = {}
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self._semaphore = asyncio.Semaphore(settings.ingest_max_concurrency)
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# 持有后台任务与镜像任务引用，避免被 GC 提前回收
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self._background_tasks: set[asyncio.Task[None]] = set()
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self._mirror_tasks: set[asyncio.Task[None]] = set()
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async def submit(self, doc: DocumentInput) -> str:
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"""登记入库任务并后台执行，立即返回 task_id"""
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task_id = uuid.uuid4().hex
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now = _utc_now_iso()
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self._tasks[task_id] = {
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"task_id": task_id,
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"status": IngestTaskStatus.PENDING,
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"created_at": now,
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"updated_at": now,
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"result": None,
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"error": None,
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}
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self._schedule_mirror(task_id)
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background = asyncio.create_task(self._run(task_id, doc))
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self._background_tasks.add(background)
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background.add_done_callback(self._background_tasks.discard)
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logger.info("入库任务已登记", task_id=task_id, title=doc.title)
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return task_id
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async def get(self, task_id: str) -> dict[str, Any] | None:
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"""查询任务状态：先查内存注册表，miss 再查 Redis 镜像，都没有返回 None"""
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record = self._tasks.get(task_id)
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if record is not None:
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return record
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if self._redis is None:
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return None
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try:
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return await self._redis.get_json(f"{REDIS_KEY_PREFIX}{task_id}")
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except Exception:
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logger.warning("入库任务状态读取 Redis 失败，降级为未命中", task_id=task_id, exc_info=True)
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return None
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async def wait_done(self, task_id: str, timeout: float = 30.0) -> dict[str, Any]:
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"""轮询内存注册表直到任务进入终态（done/failed）或超时
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进入终态后会等待已调度的 Redis 镜像写完再返回；超时抛 TimeoutError。
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"""
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loop = asyncio.get_running_loop()
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deadline = loop.time() + timeout
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while True:
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record = self._tasks.get(task_id)
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if record is not None and record["status"] in TERMINAL_STATUSES:
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if self._mirror_tasks:
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await asyncio.gather(*self._mirror_tasks, return_exceptions=True)
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return record
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if loop.time() >= deadline:
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raise TimeoutError(f"入库任务 {task_id} 在 {timeout}s 内未进入终态")
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await asyncio.sleep(0.01)
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async def _run(self, task_id: str, doc: DocumentInput) -> None:
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"""后台执行入库：并发限流 + 阶段状态推进 + 结果/错误落账"""
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async with self._semaphore:
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try:
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result = await self._ingester.ingest(doc, progress_cb=lambda stage: self._on_progress(task_id, stage))
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except IngestionError as exc:
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# 入库已知失败：透传阶段与已产出的部分总结
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self._finish_failed(
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task_id,
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{
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"stage": exc.stage,
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"message": str(exc),
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"partial_summary": exc.summary.model_dump(mode="json") if exc.summary is not None else None,
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},
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)
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except Exception as exc:
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self._finish_failed(task_id, {"stage": "unknown", "message": str(exc), "partial_summary": None})
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else:
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self._tasks[task_id].update(
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status=IngestTaskStatus.DONE,
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updated_at=_utc_now_iso(),
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result=result.model_dump(mode="json"),
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)
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self._schedule_mirror(task_id)
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logger.info("入库任务完成", task_id=task_id)
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def _finish_failed(self, task_id: str, error: dict[str, Any]) -> None:
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"""将任务置为 failed 并记录错误信息"""
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self._tasks[task_id].update(status=IngestTaskStatus.FAILED, updated_at=_utc_now_iso(), error=error)
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self._schedule_mirror(task_id)
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logger.error("入库任务失败", task_id=task_id, stage=error["stage"], error=error["message"])
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def _on_progress(self, task_id: str, stage: str) -> None:
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"""Ingester 阶段回调：推进任务状态并同步镜像（同步函数，供 progress_cb 使用）"""
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record = self._tasks.get(task_id)
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if record is None:
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return
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record["status"] = stage
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record["updated_at"] = _utc_now_iso()
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self._schedule_mirror(task_id)
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def _schedule_mirror(self, task_id: str) -> None:
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"""将当前任务状态快照异步镜像到 Redis（同步上下文也可调用）"""
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if self._redis is None:
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return
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mirror = asyncio.create_task(self._mirror_to_redis(task_id, dict(self._tasks[task_id])))
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self._mirror_tasks.add(mirror)
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mirror.add_done_callback(self._mirror_tasks.discard)
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async def _mirror_to_redis(self, task_id: str, snapshot: dict[str, Any]) -> None:
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"""写入 Redis 镜像：进行中与 done 用 ttl_done，failed 用 ttl_failed；写失败仅告警"""
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ttl = (
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self._settings.ingest_task_ttl_failed
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if snapshot["status"] == IngestTaskStatus.FAILED
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else self._settings.ingest_task_ttl_done
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)
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try:
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await self._redis.set_json(f"{REDIS_KEY_PREFIX}{task_id}", snapshot, ttl=ttl)
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except Exception:
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logger.warning("入库任务状态镜像 Redis 失败", task_id=task_id, exc_info=True)
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