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ThearchyHelios
b0575a7d1b
## 一条分支条件能把后端冻死
求值器放行 ast.Pow，唯一护栏是 AST 节点数 <= 200。`9**9**9**9` 只有 11 个节点，
却让 CPython 无限期算大整数。而求值是在事件循环里同步执行的（分支条件、
transform、口径卡、每个节点的 skip_if），没有线程池隔离也没有超时，asyncio 的
cancel 打断不了同步 CPU。给底数和指数加上界，超界报 ExpressionError。
2**10、2**0.5、10**-2 这些正常用法不受影响。
## NodeError 绕过 retries / on_error / node.failed
`except NodeError: raise` 排在重试与兜底之前，于是节点自己抛的错既不重试、
也不发 node.failed、更不被 on_error=continue 接住——而 NodeError 恰恰是所有
执行器表达失败的标准方式（缺必填输入、模型没配、口径卡算不出…）。同一张图
配着同样的 retries=1 + on_error=continue，1/0 会重试并继续，而 JSON 模板非法
直接整个 run 失败。两条路径现在行为一致，node.failed 也带上 node_id
（前端靠它把出错节点从"转圈"收敛成"失败"）。
## 没有 checkpoint 的运行被"恢复"成一份假结果
重启扫描把 running 和 queued 一律标成 interrupted，而 resume 不检查有没有
checkpoint 就发 Command。queued 的运行从没写过 checkpoint，LangGraph 会拿空
state 从 START 重跑整张图——run.input 完全没注入，用字段默认值算完还落成
succeeded。现在 queued 直接标 failed（没有进度可恢复，请重新发起），resume
先 aget_state 确认有断点，没有就 409 并说清为什么。
## 并行人工节点：一次 resume 打爆整个 run
同一 superstep 有多个 interrupt 时，resume 仍只发标量 Command，LangGraph 直接
抛 RuntimeError；而所有 pending 审批已经被写成同一个回复。Approval.interrupt_id
和 ResumeIn.approval_id 这两个字段一直存在却从没被用过。现在按 interrupt_id
逐条收集：多条待办时必须指定 approval_id，回复的那条转 answered 继续等，
凑齐引擎在等的全部 interrupt 才发 Command(resume={iid: value})。
验证：两个并行 human 节点——不指定 approval_id 被 409 拒、回复第一条后仍
interrupted 且剩 1 条 pending、凑齐后 succeeded。单人审批与 decide 通道回归通过。
495 lines
19 KiB
Python
495 lines
19 KiB
Python
from __future__ import annotations
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import asyncio
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import contextlib
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import logging
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import time
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from datetime import datetime, timezone
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from typing import Any
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from langgraph.checkpoint.sqlite.aio import AsyncSqliteSaver
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from langgraph.types import Command
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from sqlalchemy import select, update
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from app.core.bus import bus
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from app.core.config import settings
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from app.core.events import EventType, RunEventModel
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from app.db.base import SessionLocal
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from app.db.models import Approval, Run, RunEvent, Workflow
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from app.engine.compiler import compile_graph, initial_state
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from app.engine.context import RunContext
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from app.engine.schema import GraphSpec, validate_graph
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logger = logging.getLogger(__name__)
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# 流式增量（正文 token、思考 delta）量太大，只做实时推送不落库；
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# 轨迹里正文靠 node.finished 的 preview，思考靠调用结束时的单条 llm.thinking 汇总
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_EPHEMERAL = {EventType.LLM_TOKEN, EventType.LLM_THINKING_DELTA}
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class RunManager:
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"""负责一次运行的完整生命周期：启动、串流、中断、恢复、取消。"""
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def __init__(self) -> None:
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self._tasks: dict[str, asyncio.Task[None]] = {}
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self._checkpointer: AsyncSqliteSaver | None = None
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self._cm: Any = None
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self._semaphore = asyncio.Semaphore(settings.max_concurrent_runs)
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# ---------------- 生命周期 ----------------
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async def setup(self) -> None:
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settings.ensure_dirs()
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self._cm = AsyncSqliteSaver.from_conn_string(str(settings.checkpoint_path))
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self._checkpointer = await self._cm.__aenter__()
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# 上次进程被强杀时留下的记录。running 和 queued 要分开处理：
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# running 至少跑过一步、有 checkpoint，可以续；queued 还在排队，
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# 一个 checkpoint 都没写过，"恢复"它只会从 START 用默认值重跑一遍，
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# 还丢掉 run.input——那不是恢复，是伪造一份结果。
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async with SessionLocal() as session:
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await session.execute(
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update(Run)
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.where(Run.status == "running")
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.values(status="interrupted", error="服务重启，运行已挂起，可从断点恢复")
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)
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await session.execute(
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update(Run)
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.where(Run.status == "queued")
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.values(status="failed", error="服务重启时这次运行还在排队，没有可恢复的进度，请重新发起")
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)
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await session.commit()
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async def shutdown(self) -> None:
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for task in list(self._tasks.values()):
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task.cancel()
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await asyncio.gather(*self._tasks.values(), return_exceptions=True)
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if self._cm is not None:
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with contextlib.suppress(Exception):
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await self._cm.__aexit__(None, None, None)
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@property
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def checkpointer(self) -> AsyncSqliteSaver:
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if self._checkpointer is None:
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raise RuntimeError("RunManager 还没初始化")
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return self._checkpointer
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# ---------------- 事件 ----------------
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async def _emit(
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self,
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run_id: str,
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event_type: EventType | str,
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*,
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node_id: str | None = None,
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data: dict[str, Any] | None = None,
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persist: bool = True,
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) -> None:
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event = RunEventModel(
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run_id=run_id,
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seq=bus.next_seq(run_id),
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type=EventType(str(event_type)),
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node_id=node_id,
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data=data or {},
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)
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await bus.publish(event)
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if persist and event.type not in _EPHEMERAL:
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async with SessionLocal() as session:
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session.add(
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RunEvent(
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run_id=run_id,
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seq=event.seq,
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type=str(event.type),
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node_id=event.node_id,
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ts=event.ts,
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data=event.data,
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)
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)
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await session.execute(
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update(Run).where(Run.id == run_id).values(last_seq=event.seq)
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)
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await session.commit()
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async def note(
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self, run_id: str, event_type: EventType | str, *, node_id: str | None = None,
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**data: Any,
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) -> None:
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"""给 API 层用的事件入口（比如 formal 启动时记录口径升版处置）。"""
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await self._emit(run_id, event_type, node_id=node_id, data=data)
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# ---------------- 启动 ----------------
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async def start(
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self,
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*,
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graph: dict[str, Any],
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input_payload: dict[str, Any],
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workflow_id: str | None = None,
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workflow_name: str = "",
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memory_scope: str = "default",
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collection: str = "default",
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run_class: str = "exploratory",
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version: int | None = None,
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version_hash: str | None = None,
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started_by: str | None = None,
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) -> Run:
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spec = GraphSpec.model_validate(graph)
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report = validate_graph(spec)
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if not report.ok:
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raise ValueError(
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"图校验未通过：" + "；".join(i.message for i in report.issues if i.level == "error")
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)
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async with SessionLocal() as session:
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run = Run(
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workflow_id=workflow_id,
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workflow_name=workflow_name,
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status="queued",
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graph=graph,
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input=input_payload,
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run_class=run_class,
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version=version,
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version_hash=version_hash,
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started_by=started_by,
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)
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run.thread_id = run.id # 一个 run 一条 checkpoint 线程
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session.add(run)
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await session.commit()
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await session.refresh(run)
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self._tasks[run.id] = asyncio.create_task(
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self._drive(
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run.id,
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spec,
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initial_state(input_payload),
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workflow_id=workflow_id,
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memory_scope=memory_scope,
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collection=collection,
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)
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)
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return run
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async def resume(
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self, run_id: str, response: Any, *, approval_id: str | None = None,
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actor: str | None = None,
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) -> Run:
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"""从人工介入的断点继续。
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两件事以前是错的：
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一是不看有没有 checkpoint 就发 Command。重启扫描会把 queued（从没跑过、
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没有任何 checkpoint）也标成 interrupted，对这种 run 发 Command，LangGraph
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会拿一个空 state 从 START 重跑整张图——run.input 完全没被注入，最后还落成
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succeeded。跑出来的是一份用默认值算的假结果。
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二是同一 superstep 里有多个 interrupt 时，只发标量 Command 会让 LangGraph
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直接抛 RuntimeError 打爆整个 run，而所有 pending 审批还都被写成同一个回复。
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现在按 interrupt_id 逐条收集，凑齐了才继续，没凑齐就继续等下一个人回复。
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"""
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async with SessionLocal() as session:
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run = await session.get(Run, run_id)
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if not run:
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raise KeyError(f"找不到运行 {run_id}")
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if run.status not in ("interrupted",):
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raise ValueError(f"当前状态是 {run.status}，无法恢复")
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spec = GraphSpec.model_validate(run.graph)
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workflow_id = run.workflow_id
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# 先问引擎：这条线程到底停在哪、还等着哪些 interrupt
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run_ctx = RunContext(run_id=run_id, thread_id=run_id, spec=spec, workflow_id=workflow_id)
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app = compile_graph(spec, run_ctx).compile(checkpointer=self.checkpointer)
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config = {"configurable": {"thread_id": run_id}}
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snapshot = await app.aget_state(config)
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waiting = list(getattr(snapshot, "interrupts", None) or [])
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if not waiting and not getattr(snapshot, "next", None):
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# 没有断点可续。多半是重启时被标成 interrupted 的 queued 运行。
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raise ValueError(
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"这次运行没有可恢复的断点（很可能重启前还没真正开始跑）。"
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"请重新发起一次运行，而不是恢复——继续下去只会用默认值跑出一份假结果。"
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)
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answers: dict[str, Any] = {}
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async with SessionLocal() as session:
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pending = list((
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await session.execute(
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select(Approval).where(
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Approval.run_id == run_id, Approval.status == "pending"
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)
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)
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).scalars())
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# 定位这次回复的是哪一条：显式指定优先，否则只在唯一 pending 时才敢猜
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target = None
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if approval_id:
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target = next((a for a in pending if a.id == approval_id), None)
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if target is None:
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raise ValueError(f"审批 {approval_id} 不在待处理列表里")
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elif len(pending) == 1:
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target = pending[0]
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elif len(pending) > 1:
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raise ValueError(
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f"这次运行有 {len(pending)} 条待处理的人工介入，"
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"恢复时必须指定 approval_id 说明回复的是哪一条"
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)
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now = datetime.now(timezone.utc)
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if target is not None:
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target.status = "answered" # 已回复，但还没提交给引擎
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target.response = (
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_safe(response) if isinstance(response, dict) else {"value": _safe(response)}
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)
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target.resolved_at = now
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if actor:
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target.resolved_by = actor
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await session.commit()
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# 凑齐没有？引擎还在等的每一个 interrupt 都得有答案
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answered = list((
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await session.execute(
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select(Approval).where(
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Approval.run_id == run_id,
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Approval.status.in_(["answered", "pending"]),
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)
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)
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).scalars())
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by_iid = {a.interrupt_id: a for a in answered if a.interrupt_id}
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missing = []
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for item in waiting:
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iid = getattr(item, "id", None)
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rec = by_iid.get(iid)
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if rec is None or rec.status != "answered":
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missing.append(iid)
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continue
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payload = rec.response or {}
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answers[iid] = payload.get("value", payload) if isinstance(payload, dict) else payload
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if missing:
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# 还差人没回。保持 interrupted，把已回复的那条留在 answered 上等齐
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await session.commit()
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run = await session.get(Run, run_id)
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return run
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# 齐了：正式落 resolved，然后驱动引擎
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for rec in answered:
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if rec.status == "answered":
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rec.status = "resolved"
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run = await session.get(Run, run_id)
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bus.set_seq(run_id, run.last_seq)
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run.status = "running"
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run.error = None
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await session.commit()
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await session.refresh(run)
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# 单个 interrupt 用标量（LangGraph 两种都认），多个必须用 {interrupt_id: value} 映射
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command = (
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Command(resume=response)
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if len(waiting) <= 1
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else Command(resume=answers)
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)
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await self._emit(run_id, EventType.RUN_RESUMED, data={"response": _safe(response)})
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self._tasks[run_id] = asyncio.create_task(
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self._drive(run_id, spec, command, workflow_id=workflow_id)
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)
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return run
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async def cancel(self, run_id: str) -> bool:
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task = self._tasks.get(run_id)
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if task and not task.done():
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task.cancel()
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return True
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return False
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def is_active(self, run_id: str) -> bool:
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task = self._tasks.get(run_id)
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return bool(task and not task.done())
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# ---------------- 执行 ----------------
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async def _drive(
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self,
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run_id: str,
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spec: GraphSpec,
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payload: Any,
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*,
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workflow_id: str | None = None,
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memory_scope: str = "default",
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collection: str = "default",
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) -> None:
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started = time.perf_counter()
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status = "succeeded"
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error: str | None = None
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final_state: dict[str, Any] = {}
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async with self._semaphore:
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try:
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async with SessionLocal() as session:
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await session.execute(
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update(Run)
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.where(Run.id == run_id)
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.values(status="running", started_at=datetime.now(timezone.utc))
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)
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await session.commit()
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await self._emit(
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run_id,
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EventType.RUN_STARTED,
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data={"nodes": len(spec.nodes), "resumed": isinstance(payload, Command)},
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)
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run_ctx = RunContext(
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run_id=run_id,
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thread_id=run_id,
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spec=spec,
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workflow_id=workflow_id,
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memory_scope=memory_scope,
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collection=collection,
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)
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app = compile_graph(spec, run_ctx).compile(checkpointer=self.checkpointer)
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config = {
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"configurable": {"thread_id": run_id},
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"recursion_limit": settings.max_graph_steps,
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}
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interrupted = False
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async for mode, chunk in app.astream(
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payload, config=config, stream_mode=["custom", "updates"]
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):
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if mode == "custom":
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await self._handle_custom(run_id, chunk)
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elif mode == "updates":
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if await self._handle_updates(run_id, chunk):
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interrupted = True
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snapshot = await app.aget_state(config)
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final_state = dict(snapshot.values or {})
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if interrupted or snapshot.interrupts:
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status = "interrupted"
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elif snapshot.next:
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status = "interrupted"
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except asyncio.CancelledError:
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status = "cancelled"
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error = "用户取消"
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await self._emit(run_id, EventType.RUN_CANCELLED, data={})
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raise
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except Exception as e: # noqa: BLE001
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status = "failed"
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error = f"{type(e).__name__}: {e}"
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logger.exception("run %s 失败", run_id)
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await self._emit(run_id, EventType.RUN_FAILED, data={"error": error})
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finally:
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elapsed = int((time.perf_counter() - started) * 1000)
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await self._finalize(run_id, status, error, final_state, elapsed)
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self._tasks.pop(run_id, None)
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async def _handle_custom(self, run_id: str, chunk: Any) -> None:
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"""节点通过 get_stream_writer 发来的事件。"""
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if not isinstance(chunk, dict) or not chunk.get("__agentlab__"):
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return
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await self._emit(
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run_id,
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chunk.get("type", EventType.LOG),
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node_id=chunk.get("node_id"),
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data=chunk.get("data") or {},
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)
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async def _handle_updates(self, run_id: str, chunk: Any) -> bool:
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"""LangGraph 的状态更新。这里只关心中断信号 —— 节点级事件已经由 custom 流覆盖。"""
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if not isinstance(chunk, dict):
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return False
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interrupts = chunk.get("__interrupt__")
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if not interrupts:
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return False
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for item in interrupts:
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value = getattr(item, "value", item)
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interrupt_id = getattr(item, "id", None)
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payload = value if isinstance(value, dict) else {"value": value}
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async with SessionLocal() as session:
|
||
existing = (
|
||
await session.execute(
|
||
select(Approval).where(
|
||
Approval.run_id == run_id,
|
||
Approval.interrupt_id == interrupt_id,
|
||
Approval.status == "pending",
|
||
)
|
||
)
|
||
).scalar_one_or_none()
|
||
if existing is None:
|
||
session.add(
|
||
Approval(
|
||
run_id=run_id,
|
||
node_id=str(payload.get("node_id") or ""),
|
||
interrupt_id=interrupt_id,
|
||
mode=str(payload.get("mode") or "approve"),
|
||
title=str(payload.get("title") or "需要你确认"),
|
||
payload=payload,
|
||
schema_=payload.get("schema") or {},
|
||
)
|
||
)
|
||
await session.commit()
|
||
await self._emit(
|
||
run_id,
|
||
EventType.RUN_INTERRUPTED,
|
||
node_id=payload.get("node_id"),
|
||
data={"interrupt_id": interrupt_id, "payload": _safe(payload)},
|
||
)
|
||
return True
|
||
|
||
async def _finalize(
|
||
self,
|
||
run_id: str,
|
||
status: str,
|
||
error: str | None,
|
||
state: dict[str, Any],
|
||
elapsed_ms: int,
|
||
) -> None:
|
||
usage = dict(state.get("usage") or {})
|
||
usage["duration_ms"] = elapsed_ms
|
||
output = dict(state.get("output") or {})
|
||
|
||
async with SessionLocal() as session:
|
||
run = await session.get(Run, run_id)
|
||
if run:
|
||
run.status = status
|
||
run.error = error
|
||
run.output = output
|
||
run.usage = usage
|
||
if status != "interrupted":
|
||
run.finished_at = datetime.now(timezone.utc)
|
||
# 终态时对全部已落库事件计算清单哈希：事后任何对事件流的
|
||
# 增删改都会与这个值对不上。中断态不算——事件还会继续追加。
|
||
from app.core.artifact_store import manifest_hash as _manifest
|
||
|
||
rows = await session.execute(
|
||
select(RunEvent.seq, RunEvent.type, RunEvent.node_id, RunEvent.data)
|
||
.where(RunEvent.run_id == run_id)
|
||
.order_by(RunEvent.seq)
|
||
)
|
||
run.manifest_hash = _manifest([tuple(r) for r in rows])
|
||
await session.commit()
|
||
|
||
if status == "succeeded":
|
||
await self._emit(
|
||
run_id,
|
||
EventType.RUN_FINISHED,
|
||
data={"output": _safe(output), "usage": usage, "duration_ms": elapsed_ms},
|
||
)
|
||
if status in ("succeeded", "failed", "cancelled"):
|
||
await bus.close(run_id)
|
||
|
||
|
||
def _safe(value: Any, limit: int = 4000) -> Any:
|
||
"""把任意对象裁剪成能安全放进事件负载的形状。"""
|
||
if isinstance(value, str):
|
||
return value[:limit]
|
||
if isinstance(value, dict):
|
||
return {k: _safe(v, limit // 2) for k, v in list(value.items())[:50]}
|
||
if isinstance(value, list):
|
||
return [_safe(v, limit // 2) for v in value[:50]]
|
||
if isinstance(value, (int, float, bool)) or value is None:
|
||
return value
|
||
return str(value)[:limit]
|
||
|
||
|
||
run_manager = RunManager()
|