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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。
471 lines
17 KiB
Python
471 lines
17 KiB
Python
from __future__ import annotations
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import asyncio
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import contextlib
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from typing import Any
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from fastapi import APIRouter, Depends, Header, HTTPException, Query, WebSocket, WebSocketDisconnect
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from pydantic import BaseModel, Field
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from sqlalchemy import select
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from sqlalchemy.ext.asyncio import AsyncSession
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from sqlalchemy import select as _select
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from app.core.bus import bus
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from app.core import artifact_store
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from app.db.base import SessionLocal, get_session
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from app.db.models import Approval, Artifact, Run, RunEvent, Workflow, WorkflowVersion
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from app.engine.governance import unresolved_caliber_upgrades
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from app.engine.runner import run_manager
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from app.engine.schema import GraphSpec
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router = APIRouter(prefix="/api/runs", tags=["runs"])
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class StartRunIn(BaseModel):
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workflow_id: str | None = None
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graph: dict[str, Any] | None = None # 直接跑一张未保存的图（画布上的"试运行"）
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input: dict[str, Any] = Field(default_factory=dict)
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memory_scope: str = "default"
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collection: str = "default"
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# formal：从已发布的不可变版本发起，可复现可出具；exploratory：随便玩
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run_class: str = "exploratory"
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version: int | None = None # formal 时可指定版本，默认用已发布版本
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class RunOut(BaseModel):
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id: str
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workflow_id: str | None
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workflow_name: str
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status: str
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input: dict[str, Any]
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output: dict[str, Any]
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error: str | None
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usage: dict[str, Any]
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run_class: str | None = "exploratory"
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version: int | None = None
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version_hash: str | None = None
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manifest_hash: str | None = None
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started_by: str | None = None
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created_at: Any = None
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started_at: Any = None
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finished_at: Any = None
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model_config = {"from_attributes": True}
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@router.post("", response_model=RunOut, status_code=201)
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async def start_run(
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payload: StartRunIn,
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session: AsyncSession = Depends(get_session),
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x_actor: str | None = Header(default=None),
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) -> Run:
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actor = (x_actor or "").strip() or None
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name = "临时图"
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version: int | None = None
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version_hash: str | None = None
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if payload.run_class == "formal":
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# 正式运行的全部语义就这一条规则：必须引用一个不可变的已发布版本。
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# 传裸 graph、或工作流还没发布过，都进不了 formal。
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if not payload.workflow_id:
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raise HTTPException(400, "正式运行必须指定 workflow_id")
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if payload.graph is not None:
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raise HTTPException(400, "正式运行不接受临时 graph——先保存并发布版本")
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workflow = await session.get(Workflow, payload.workflow_id)
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if not workflow:
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raise HTTPException(404, "工作流不存在")
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# 只看 published_version：status 反映的是当前画布（改过图就退回 draft），
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# 而 formal 跑的是已发布的那一版，两者本来就可以不一致
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if not workflow.published_version:
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raise HTTPException(409, f"「{workflow.name}」还没有发布版本，先在编排页发布")
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version = payload.version or workflow.published_version
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# "不可变"和"过过闸"是两件事。快照确实不可变，但 PATCH 保存出来的
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# 草稿版本同样有快照——只认 version 存不存在的话，工作流只要发布过
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# 任意一个版本，之后所有草稿都能以 formal 身份启动，发布期的
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# validate_graph + lint_for_publish 全部绕过。
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if version != workflow.published_version:
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raise HTTPException(
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409,
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f"v{version} 不是当前发布版本（v{workflow.published_version}）。"
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"正式运行只能引用发布过的版本——要跑这一版就先发布它。",
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)
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snapshot = (
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await session.execute(
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_select(WorkflowVersion).where(
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WorkflowVersion.workflow_id == workflow.id,
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WorkflowVersion.version == version,
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)
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)
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).scalar_one_or_none()
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if not snapshot:
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raise HTTPException(404, f"版本 v{version} 不存在")
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graph = snapshot.graph
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version_hash = snapshot.graph_hash or artifact_store.graph_hash(graph)
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name = workflow.name
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# 口径升版是被迫处置的事件：钉住的方法卡有新版本而未声明策略，拒绝启动
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spec = GraphSpec.model_validate(graph)
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errors, upgrade_events = await unresolved_caliber_upgrades(session, spec)
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if errors:
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raise HTTPException(409, "；".join(errors))
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else:
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graph = payload.graph
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upgrade_events = []
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if payload.workflow_id:
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workflow = await session.get(Workflow, payload.workflow_id)
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if not workflow:
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raise HTTPException(404, "工作流不存在")
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graph = graph or workflow.graph
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name = workflow.name
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if not graph:
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raise HTTPException(400, "需要提供 workflow_id 或 graph")
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try:
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run = await run_manager.start(
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graph=graph,
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input_payload=payload.input,
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workflow_id=payload.workflow_id,
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workflow_name=name,
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memory_scope=payload.memory_scope,
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collection=payload.collection,
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run_class="formal" if payload.run_class == "formal" else "exploratory",
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version=version,
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version_hash=version_hash,
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started_by=actor,
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)
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except ValueError as e:
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raise HTTPException(400, str(e)) from e
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# 已声明策略的升版记入事件流，出具物上能看到"这期换口径了、怎么处置的"
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for ev in upgrade_events:
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payload_ev = dict(ev)
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node = payload_ev.pop("node_id", None)
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await run_manager.note(run.id, "caliber.upgrade", node_id=node, **payload_ev)
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return run
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@router.get("", response_model=list[RunOut])
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async def list_runs(
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workflow_id: str | None = None,
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status: str | None = None,
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limit: int = Query(default=50, le=200),
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session: AsyncSession = Depends(get_session),
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) -> list[Run]:
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stmt = select(Run).order_by(Run.created_at.desc()).limit(limit)
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if workflow_id:
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stmt = stmt.where(Run.workflow_id == workflow_id)
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if status:
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stmt = stmt.where(Run.status == status)
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return list((await session.execute(stmt)).scalars())
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@router.get("/{run_id}", response_model=RunOut)
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async def get_run(run_id: str, session: AsyncSession = Depends(get_session)) -> Run:
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run = await session.get(Run, run_id)
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if not run:
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raise HTTPException(404, "运行记录不存在")
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return run
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@router.get("/{run_id}/events")
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async def get_events(
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run_id: str,
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after: int = 0,
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session: AsyncSession = Depends(get_session),
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) -> list[dict[str, Any]]:
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"""拉历史事件。刷新页面后重建时间线用这个，再接 WebSocket 续上实时流。"""
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rows = await session.execute(
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select(RunEvent)
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.where(RunEvent.run_id == run_id, RunEvent.seq > after)
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.order_by(RunEvent.seq)
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)
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return [
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{
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"id": e.id,
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"run_id": e.run_id,
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"seq": e.seq,
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"type": e.type,
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"node_id": e.node_id,
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"ts": e.ts,
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"data": e.data,
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}
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for e in rows.scalars()
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]
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@router.get("/{run_id}/artifacts")
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async def list_artifacts(
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run_id: str, session: AsyncSession = Depends(get_session)
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) -> list[dict[str, Any]]:
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"""这次运行产出的全部工件引用。审阅出具物时从这里下钻到完整证据。"""
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rows = await session.execute(
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select(Artifact).where(Artifact.run_id == run_id).order_by(Artifact.created_at)
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)
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return [
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{
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"id": a.id,
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"kind": a.kind,
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"node_id": a.node_id,
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"size": a.size,
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"meta": a.meta,
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"created_at": a.created_at.isoformat() if a.created_at else None,
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}
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for a in rows.scalars()
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]
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@router.post("/{run_id}/cancel")
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async def cancel_run(run_id: str) -> dict[str, Any]:
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stopped = await run_manager.cancel(run_id)
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if not stopped:
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raise HTTPException(409, "该运行当前不在执行中")
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return {"ok": True}
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class ResumeIn(BaseModel):
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response: Any = None
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approval_id: str | None = None
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@router.post("/{run_id}/resume", response_model=RunOut)
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async def resume_run(
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run_id: str, payload: ResumeIn, x_actor: str | None = Header(default=None)
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) -> Run:
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try:
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# approval_id 以前定义了却从没传下去——一次运行里有多条待审批时，
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# 引擎无从知道这次回复的是哪一条
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return await run_manager.resume(
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run_id, payload.response,
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approval_id=payload.approval_id,
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actor=(x_actor or "").strip() or None,
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)
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except KeyError as e:
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raise HTTPException(404, str(e)) from e
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except ValueError as e:
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raise HTTPException(409, str(e)) from e
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@router.get("/{run_id}/state")
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async def get_state(run_id: str) -> dict[str, Any]:
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"""读取 checkpoint 里的当前状态。调试中断中的 run 时很有用。"""
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from app.engine.compiler import compile_graph
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from app.engine.context import RunContext
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from app.engine.schema import GraphSpec
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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 HTTPException(404, "运行记录不存在")
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spec = GraphSpec.model_validate(run.graph)
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app = compile_graph(spec, RunContext(run_id=run_id, thread_id=run_id, spec=spec)).compile(
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checkpointer=run_manager.checkpointer
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)
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snapshot = await app.aget_state({"configurable": {"thread_id": run_id}})
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values = dict(snapshot.values or {})
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values.pop("messages", None) # 消息对象不好直接序列化，前端也用不到
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return {
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"values": _jsonable(values),
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"next": list(snapshot.next or ()),
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"interrupts": [
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{"id": getattr(i, "id", None), "value": _jsonable(getattr(i, "value", None))}
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for i in (snapshot.interrupts or ())
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],
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}
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@router.get("/{run_id}/history")
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async def get_history(run_id: str, limit: int = 50) -> list[dict[str, Any]]:
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"""checkpoint 历史 —— 可以看到每一步之后的状态快照，用来做时间旅行式调试。"""
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from app.engine.compiler import compile_graph
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from app.engine.context import RunContext
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from app.engine.schema import GraphSpec
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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 HTTPException(404, "运行记录不存在")
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spec = GraphSpec.model_validate(run.graph)
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app = compile_graph(spec, RunContext(run_id=run_id, thread_id=run_id, spec=spec)).compile(
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checkpointer=run_manager.checkpointer
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)
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out: list[dict[str, Any]] = []
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async for snapshot in app.aget_state_history({"configurable": {"thread_id": run_id}}):
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values = dict(snapshot.values or {})
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values.pop("messages", None)
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out.append(
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{
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"checkpoint_id": snapshot.config.get("configurable", {}).get("checkpoint_id"),
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"next": list(snapshot.next or ()),
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"created_at": snapshot.created_at,
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"trail": _jsonable(values.get("trail") or [])[-1:],
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"nodes_done": list((values.get("nodes") or {}).keys()),
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}
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)
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if len(out) >= limit:
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break
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return out
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@router.delete("/{run_id}", status_code=204)
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async def delete_run(run_id: str, session: AsyncSession = Depends(get_session)) -> None:
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run = await session.get(Run, run_id)
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if not run:
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raise HTTPException(404, "运行记录不存在")
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await session.delete(run)
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await session.commit()
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# --------------------------------------------------------------------------
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# 实时事件流
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# --------------------------------------------------------------------------
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@router.websocket("/{run_id}/stream")
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async def stream_run(websocket: WebSocket, run_id: str) -> None:
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"""把一次运行的事件推给前端。
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先补历史再接实时，所以中途打开页面、或者刷新之后，时间线都是完整的。
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"""
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await websocket.accept()
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after = int(websocket.query_params.get("after", 0) or 0)
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try:
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async with SessionLocal() as session:
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rows = await session.execute(
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select(RunEvent)
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.where(RunEvent.run_id == run_id, RunEvent.seq > after)
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.order_by(RunEvent.seq)
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)
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for event in rows.scalars():
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await websocket.send_json(
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{
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"seq": event.seq,
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"type": 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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"replay": True,
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}
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)
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run = await session.get(Run, run_id)
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# 已经结束的 run 没有后续事件，补完历史就关掉
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if run and run.status in ("succeeded", "failed", "cancelled"):
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await websocket.send_json({"type": "stream.end", "status": run.status})
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await websocket.close()
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return
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stream = bus.subscribe(run_id)
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pump = asyncio.create_task(_pump(websocket, stream))
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try:
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# 客户端断开时读操作会抛异常，用它来结束这条连接
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while True:
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await websocket.receive_text()
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except WebSocketDisconnect:
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pass
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finally:
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pump.cancel()
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with contextlib.suppress(asyncio.CancelledError):
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await pump
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except WebSocketDisconnect:
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return
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except Exception: # noqa: BLE001
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with contextlib.suppress(Exception):
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await websocket.close()
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async def _pump(websocket: WebSocket, stream: Any) -> None:
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try:
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async for event in stream:
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await websocket.send_json(event.to_wire())
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except (WebSocketDisconnect, RuntimeError):
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return
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# --------------------------------------------------------------------------
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# 审批
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# --------------------------------------------------------------------------
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approvals_router = APIRouter(prefix="/api/approvals", tags=["approvals"])
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class ApprovalOut(BaseModel):
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id: str
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run_id: str
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node_id: str
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mode: str
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title: str
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payload: dict[str, Any]
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status: str
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response: dict[str, Any]
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created_at: Any = None
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model_config = {"from_attributes": True}
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|
||
@approvals_router.get("", response_model=list[ApprovalOut])
|
||
async def list_approvals(
|
||
status: str = "pending",
|
||
run_id: str | None = None,
|
||
session: AsyncSession = Depends(get_session),
|
||
) -> list[Approval]:
|
||
stmt = select(Approval).order_by(Approval.created_at.desc()).limit(100)
|
||
if status != "all":
|
||
stmt = stmt.where(Approval.status == status)
|
||
if run_id:
|
||
stmt = stmt.where(Approval.run_id == run_id)
|
||
return list((await session.execute(stmt)).scalars())
|
||
|
||
|
||
class DecideIn(BaseModel):
|
||
approved: bool = True
|
||
note: str = ""
|
||
value: Any = None
|
||
args: dict[str, Any] | None = None
|
||
|
||
|
||
@approvals_router.post("/{approval_id}/decide", response_model=RunOut)
|
||
async def decide(
|
||
approval_id: str,
|
||
payload: DecideIn,
|
||
session: AsyncSession = Depends(get_session),
|
||
x_actor: str | None = Header(default=None),
|
||
) -> Run:
|
||
approval = await session.get(Approval, approval_id)
|
||
if not approval:
|
||
raise HTTPException(404, "审批请求不存在")
|
||
if approval.status != "pending":
|
||
raise HTTPException(409, "该请求已经处理过了")
|
||
|
||
# 责任归属先落库再恢复执行——恢复失败也要留下"谁试图批的"
|
||
approval.resolved_by = (x_actor or "").strip() or None
|
||
await session.commit()
|
||
|
||
response: dict[str, Any] = {"approved": payload.approved, "note": payload.note}
|
||
if payload.value is not None:
|
||
response["value"] = payload.value
|
||
if payload.args is not None:
|
||
response["args"] = payload.args
|
||
|
||
try:
|
||
return await run_manager.resume(
|
||
approval.run_id, response,
|
||
approval_id=approval.id,
|
||
actor=approval.resolved_by,
|
||
)
|
||
except ValueError as e:
|
||
raise HTTPException(409, str(e)) from e
|
||
|
||
|
||
def _jsonable(value: Any) -> Any:
|
||
if isinstance(value, dict):
|
||
return {str(k): _jsonable(v) for k, v in value.items()}
|
||
if isinstance(value, (list, tuple)):
|
||
return [_jsonable(v) for v in value]
|
||
if isinstance(value, (str, int, float, bool)) or value is None:
|
||
return value
|
||
return str(value)
|