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ThearchyHelios
b418c0d951
四组验收员拿审查原文在沙箱里逐条复现：133 项已解决、15 项部分解决、没有未解决或回退的； 另发现 10 个新问题。按归属返工后，剩 3 项低严重度：MCP / 自定义工具的危险标记（待用户拍板）、 选中环与运行态同色（需跨三处协调改）、「接着跑」这个说法是否更换（多处引用原文，暂留）。 这次返工改了 - 右栏：老运行没有 active_ms 时执行时长改按航迹算，不再显示最后一段的「22 ms」；循环出口行不再差一； 取消在一轮中途时泳道脚注不写「0 ms」；分支、循环出口显示 case 的说明而不是 key； 展开已完成轮次不再误报「N 条新进展」；旧数据里已完成的模型调用不再一律标成「已取消」 - 后端：跳过事件带节点名和类型；restore 版本时把已发布 / 受管退回草稿；只是打开旧会话不再把它顶到最前、 标成「刚刚」；协作团队全程没有成员交付成果、调度者却判完成时按失败或降档处理，不再当成功交付 - 画布：循环体有「循环体 · 最多 N 轮」的底框，出口标签不再被自己的走线穿过；运行中校验角标退让； 768 宽下工具栏不溢出；运行被拦时点名是哪个节点；正式运行弹层写明以谁的名义发起 - 问数据：离线时能力条不把「没取回来」说成 0；窄屏下会话列表收起；check-chat 在零点前后不再误报 - 公共层：FastAPI 422 校验错误翻成中文，不再把英文原文透给用户 验证（沙箱）：tsc 干净，pytest 878 passed（两遍），check-all 15 项检查全绿。
477 lines
18 KiB
Python
477 lines
18 KiB
Python
"""会话：把一串问答串成一次对话。
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在此之前"对话"只是前端内存里的一个数组——刷新页面就没了，而每一轮又各自
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从零建图，所以"上一轮问过什么"在系统里无处可查。这个模块把它落到库里，
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同时服务两件事：给用户看的历史列表，和给模型看的上下文（`_history_text`
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被 copilot 拿去拼进 prompt）。
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轮次的写入由前端驱动，分两步：开轮（只有问题）→ 回填（图、run、答案）。
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让 copilot 或 runner 自己去写会更"自动"，但建图失败、运行失败、用户中途
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取消这三种半途而废的情况它们各自只知道一半，最后还是要在三个地方各接一次。
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前端本来就完整地知道这一轮走到哪了。
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"""
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from __future__ import annotations
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from datetime import datetime, timedelta, timezone
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from typing import Any
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from fastapi import APIRouter, Depends, HTTPException
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from pydantic import BaseModel, Field
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from sqlalchemy import and_, delete, func, select
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from sqlalchemy.ext.asyncio import AsyncSession
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from app.db.base import get_session, utcnow
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from app.db.models import Approval, Conversation, ConversationTurn, Run
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router = APIRouter(prefix="/api/conversations", tags=["conversations"])
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#: 喂给模型的历史轮数上限。再多意义不大，而 prompt 是要花钱的
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HISTORY_TURNS = 6
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#: 单轮问答在上下文里的截断长度。一次查询结果可能有几千字，整段塞进去
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#: 会把后面几轮挤掉——那还不如少说点、多留几轮
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HISTORY_ANSWER_CHARS = 600
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def title_from(question: str, limit: int = 24) -> str:
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"""用第一问当标题。没有标题的会话在列表里是一排"新对话"，等于没有列表。"""
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text = " ".join((question or "").split())
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if not text:
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return "新对话"
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return text if len(text) <= limit else text[:limit] + "…"
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# --------------------------------------------------------------------------
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# 出入参
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# --------------------------------------------------------------------------
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class ConversationIn(BaseModel):
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kind: str = Field(default="chat", pattern="^(chat|canvas)$")
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workflow_id: str | None = None
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title: str = ""
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class ConversationPatch(BaseModel):
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title: str | None = None
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archived: bool | None = None
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class TurnIn(BaseModel):
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question: str = ""
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class TurnPatch(BaseModel):
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"""回填。全是可选——一轮可能在任何一步停下，能填多少填多少。"""
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question: str | None = None
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answer: str | None = None
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explanation: str | None = None
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graph: dict[str, Any] | None = None
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run_id: str | None = None
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status: str | None = Field(default=None, pattern="^(running|done|error)$")
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error: str | None = None
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review: dict[str, Any] | None = None
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#: 可信度元数据，前端整块写、整块读，后端不解读它的内容（列表状态除外，见 last_status）
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meta: dict[str, Any] | None = None
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class TurnOut(BaseModel):
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id: str
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seq: int
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question: str
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answer: str
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explanation: str
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graph: dict[str, Any] | None = None
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run_id: str | None = None
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status: str
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error: str
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#: 复核结论。None = 这一轮没复核过，和「复核过、没发现问题」不是一回事
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review: dict[str, Any] | None = None
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#: 可信度元数据。老轮次挂在 review.meta 下，读出来时统一放到这里
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meta: dict[str, Any] | None = None
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created_at: Any = None
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#: 最后一次落库。列表判「建图断了」按它算（BUILD_STALE），前端用同一只钟
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updated_at: Any = None
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model_config = {"from_attributes": True}
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class ConversationOut(BaseModel):
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id: str
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title: str
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kind: str
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workflow_id: str | None = None
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archived: bool
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created_at: Any = None
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last_active_at: Any = None
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turn_count: int = 0
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#: 列表里给个副标题，让人一眼认出是哪次聊天
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last_question: str = ""
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#: 最后一轮停在哪：running | waiting | error | cancelled | suspended | done，
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#: 没有轮次时为 None。见 last_status()
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last_status: str | None = None
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#: 最后一轮的运行。建图阶段就断了的没有
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last_run_id: str | None = None
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model_config = {"from_attributes": True}
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class ConversationDetail(ConversationOut):
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turns: list[TurnOut] = Field(default_factory=list)
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# from_attributes 不能直接吃 Conversation：pydantic 会去读同名的 turns
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# 关系属性，而那是个未加载的 lazy relationship，在异步上下文里一读就是
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# MissingGreenlet。turns 一律显式传进来
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model_config = {"from_attributes": False}
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def turn_meta(turn: Any) -> dict[str, Any] | None:
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"""这一轮的元数据：meta 列优先，老数据退回 review.meta。"""
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if isinstance(turn.meta, dict):
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return turn.meta
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bridged = turn.review.get("meta") if isinstance(turn.review, dict) else None
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return bridged if isinstance(bridged, dict) else None
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def turn_run_id(turn: Any) -> str | None:
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"""这一轮现在的运行。meta 里写了 runId 就以它为准，哪怕是 null：重试会换一次运行，
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run_id 列却清不掉（回填里 None 表示「不改」），还指着上一次的。老轮次没有这个键，看列。"""
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meta = turn_meta(turn) or {}
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if "runId" in meta:
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return meta["runId"] or None
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return turn.run_id or None
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def _turn_out(turn: ConversationTurn) -> TurnOut:
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out = TurnOut.model_validate(turn)
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out.meta = turn_meta(turn)
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return out
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def _detail(row: Conversation, turns: list[ConversationTurn]) -> ConversationDetail:
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base = ConversationOut.model_validate(row)
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return ConversationDetail(
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**base.model_dump(),
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turns=[_turn_out(t) for t in turns],
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)
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#: 还没有运行的轮次停在 running 超过这么久，就当建图断了。建图跟着浏览器那条流走，
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#: 页面一关就停，轮次却一直是 running；最长的正常情况是模型超时再加两轮自查修正
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BUILD_STALE = timedelta(minutes=15)
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def last_status(
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turn: Any, run_status: str | None, pending: bool, now: datetime | None = None,
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) -> str:
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"""一轮停在哪。轮次状态只有 running / done / error 三种，细分要看运行和元数据。
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轮次状态是前端写的：页面关掉、服务重启时它停在 running，这时要以运行的状态为准；
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运行也没有的，是断在了建图阶段。已经收尾的轮次以轮次自己为准——它写下的就是
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用户看到的结局（取消、服务重启挂起在 error 里分开记）。
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"""
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outcome = (turn_meta(turn) or {}).get("outcome")
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if turn.status == "done":
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return "done"
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if turn.status == "error":
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if outcome == "cancelled" or (turn.error or "").strip() == "已取消":
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return "cancelled"
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if outcome == "suspended":
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# 挂起之后可能已经在别处接着跑了
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live = _from_run(run_status, pending)
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return live if live in ("running", "waiting") else "suspended"
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return "error"
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live = _from_run(run_status, pending)
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if live:
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return live
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updated = turn.updated_at
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if updated is not None and updated.tzinfo is None:
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updated = updated.replace(tzinfo=timezone.utc)
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stale = updated is not None and (now or utcnow()) - updated > BUILD_STALE
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return "error" if stale else "running"
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def _from_run(run_status: str | None, pending: bool) -> str | None:
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return {
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"queued": "running", "running": "running",
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"interrupted": "waiting" if pending else "suspended",
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"succeeded": "done", "failed": "error", "cancelled": "cancelled",
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}.get(run_status or "")
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async def _last_turns(
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session: AsyncSession, ids: list[str]
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) -> dict[str, ConversationTurn]:
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"""每个会话 seq 最大的那一轮。一次查完，列表长了也只是一次往返。"""
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latest = (
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select(ConversationTurn.conversation_id, func.max(ConversationTurn.seq).label("seq"))
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.where(ConversationTurn.conversation_id.in_(ids))
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.group_by(ConversationTurn.conversation_id)
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.subquery()
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)
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rows = (await session.execute(
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select(ConversationTurn).join(latest, and_(
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ConversationTurn.conversation_id == latest.c.conversation_id,
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ConversationTurn.seq == latest.c.seq,
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))
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)).scalars()
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return {t.conversation_id: t for t in rows}
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async def _statuses(
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session: AsyncSession, turns: dict[str, ConversationTurn]
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) -> dict[str, tuple[str, str | None]]:
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"""会话 id → (last_status, last_run_id)。运行状态和待审批各一次查询。"""
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run_of = {cid: turn_run_id(t) for cid, t in turns.items()}
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run_ids = {r for r in run_of.values() if r}
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runs: dict[str, str] = {}
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waiting: set[str] = set()
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if run_ids:
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runs = dict((await session.execute(
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select(Run.id, Run.status).where(Run.id.in_(run_ids))
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)).all())
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stopped = [r for r, st in runs.items() if st == "interrupted"]
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if stopped:
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waiting = set((await session.execute(
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select(Approval.run_id).where(
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Approval.run_id.in_(stopped), Approval.status == "pending")
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)).scalars())
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now = utcnow()
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out: dict[str, tuple[str, str | None]] = {}
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for cid, turn in turns.items():
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run_id = run_of[cid] if run_of[cid] in runs else None
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out[cid] = (last_status(turn, runs.get(run_id or ""), run_id in waiting, now),
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run_id)
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return out
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# --------------------------------------------------------------------------
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# 会话
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# --------------------------------------------------------------------------
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async def _get(session: AsyncSession, conversation_id: str) -> Conversation:
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row = await session.get(Conversation, conversation_id)
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if not row:
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raise HTTPException(404, "这个对话不存在，可能已经被删了")
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return row
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@router.get("", response_model=list[ConversationOut])
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async def list_conversations(
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kind: str = "chat",
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workflow_id: str | None = None,
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include_archived: bool = False,
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session: AsyncSession = Depends(get_session),
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) -> list[ConversationOut]:
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query = select(Conversation).where(Conversation.kind == kind)
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if workflow_id:
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query = query.where(Conversation.workflow_id == workflow_id)
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if not include_archived:
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query = query.where(Conversation.archived.is_(False))
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rows = list((await session.execute(
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query.order_by(Conversation.last_active_at.desc())
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)).scalars())
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if not rows:
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return []
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# 轮数、最后一轮、它的运行状态一次查完。每条会话各查一次的话，列表长了就是
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# 几十次往返。状态要带上：没打开过的会话也得标得出「在等审批」「失败了」
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ids = [r.id for r in rows]
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counts = dict((await session.execute(
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select(ConversationTurn.conversation_id, func.count(ConversationTurn.id))
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.where(ConversationTurn.conversation_id.in_(ids))
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.group_by(ConversationTurn.conversation_id)
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)).all())
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last = await _last_turns(session, ids)
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status = await _statuses(session, last)
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out: list[ConversationOut] = []
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for row in rows:
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item = ConversationOut.model_validate(row)
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item.turn_count = int(counts.get(row.id, 0))
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if row.id in last:
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item.last_question = last[row.id].question or ""
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item.last_status, item.last_run_id = status[row.id]
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out.append(item)
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return out
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@router.post("", response_model=ConversationDetail, status_code=201)
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async def create_conversation(
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payload: ConversationIn, session: AsyncSession = Depends(get_session)
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) -> ConversationDetail:
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row = Conversation(
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kind=payload.kind,
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workflow_id=payload.workflow_id,
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title=payload.title or "新对话",
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)
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session.add(row)
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await session.commit()
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await session.refresh(row)
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return _detail(row, [])
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@router.get("/{conversation_id}", response_model=ConversationDetail)
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async def get_conversation(
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conversation_id: str, session: AsyncSession = Depends(get_session)
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) -> ConversationDetail:
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row = await _get(session, conversation_id)
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turns = list((await session.execute(
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select(ConversationTurn)
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.where(ConversationTurn.conversation_id == conversation_id)
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.order_by(ConversationTurn.seq)
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)).scalars())
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out = _detail(row, turns)
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out.turn_count = len(turns)
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out.last_question = turns[-1].question if turns else ""
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if turns:
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out.last_status, out.last_run_id = (await _statuses(session, {row.id: turns[-1]}))[row.id]
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return out
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@router.patch("/{conversation_id}", response_model=ConversationOut)
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async def patch_conversation(
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conversation_id: str,
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payload: ConversationPatch,
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session: AsyncSession = Depends(get_session),
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) -> ConversationOut:
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row = await _get(session, conversation_id)
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if payload.title is not None:
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row.title = payload.title.strip() or row.title
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if payload.archived is not None:
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row.archived = payload.archived
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await session.commit()
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await session.refresh(row)
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return ConversationOut.model_validate(row)
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@router.delete("/{conversation_id}", status_code=204)
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async def delete_conversation(
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conversation_id: str, session: AsyncSession = Depends(get_session)
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) -> None:
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row = await _get(session, conversation_id)
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# 显式删 turns 而不是只靠 ondelete=CASCADE：SQLite 的外键级联要 PRAGMA
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# 打开才生效（base.py 里是打开的），但这条路径不该依赖一个连接级的开关
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await session.execute(
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delete(ConversationTurn).where(ConversationTurn.conversation_id == conversation_id)
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)
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await session.delete(row)
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await session.commit()
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# --------------------------------------------------------------------------
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# 轮次
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# --------------------------------------------------------------------------
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@router.post("/{conversation_id}/turns", response_model=TurnOut, status_code=201)
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async def create_turn(
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conversation_id: str,
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payload: TurnIn,
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session: AsyncSession = Depends(get_session),
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) -> TurnOut:
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conversation = await _get(session, conversation_id)
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next_seq = int((await session.execute(
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select(func.coalesce(func.max(ConversationTurn.seq), -1))
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.where(ConversationTurn.conversation_id == conversation_id)
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)).scalar_one()) + 1
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turn = ConversationTurn(
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conversation_id=conversation_id, seq=next_seq,
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question=payload.question, status="running",
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)
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session.add(turn)
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conversation.last_active_at = utcnow()
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# 第一轮的问题就是这次对话的标题。用户改过名就不要再覆盖回去
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if next_seq == 0 and conversation.title in ("", "新对话"):
|
||
conversation.title = title_from(payload.question)
|
||
|
||
await session.commit()
|
||
await session.refresh(turn)
|
||
return _turn_out(turn)
|
||
|
||
|
||
@router.patch("/{conversation_id}/turns/{turn_id}", response_model=TurnOut)
|
||
async def patch_turn(
|
||
conversation_id: str,
|
||
turn_id: str,
|
||
payload: TurnPatch,
|
||
session: AsyncSession = Depends(get_session),
|
||
) -> TurnOut:
|
||
turn = await session.get(ConversationTurn, turn_id)
|
||
if not turn or turn.conversation_id != conversation_id:
|
||
raise HTTPException(404, "这一轮对话不存在，可能已经被删了")
|
||
|
||
for field in (
|
||
"question", "answer", "explanation", "graph", "run_id", "status", "error", "review", "meta",
|
||
):
|
||
value = getattr(payload, field)
|
||
if value is not None:
|
||
setattr(turn, field, value)
|
||
|
||
# 活跃时间只认人在这里开始做事：改问题、按下运行、重试（状态回到 running）。
|
||
# 打开会话时前端的回源核对也走这里——补全截断的答案、记下运行已删、把断掉的
|
||
# 建图写回 error、补交付错过的结果——这些不算，否则旧会话一打开就顶到列表最上面
|
||
if payload.question is not None or payload.run_id is not None or payload.status == "running":
|
||
conversation = await session.get(Conversation, conversation_id)
|
||
if conversation:
|
||
conversation.last_active_at = utcnow()
|
||
await session.commit()
|
||
await session.refresh(turn)
|
||
return _turn_out(turn)
|
||
|
||
|
||
# --------------------------------------------------------------------------
|
||
# 给模型看的那一份
|
||
# --------------------------------------------------------------------------
|
||
|
||
|
||
def _answer_of(turn: ConversationTurn) -> str:
|
||
"""这一轮的结果。问数据页是 answer，画布那条路径上只有 explanation。"""
|
||
text = (turn.answer or turn.explanation or "").strip()
|
||
if turn.status == "error" and turn.error:
|
||
return f"（这一轮失败了：{turn.error[:200]}）"
|
||
if len(text) > HISTORY_ANSWER_CHARS:
|
||
text = text[:HISTORY_ANSWER_CHARS] + "…（略）"
|
||
# 复核判过不可信的答案，下一轮必须知道。只给正文的话，模型会拿一个已知
|
||
# 有问题的结论当事实继续往下推，错误就这么一轮轮传下去了
|
||
note = (turn.review or {}).get("note", "") if isinstance(turn.review, dict) else ""
|
||
if note:
|
||
text = f"{text}\n（复核提示：{note[:200]}）".strip()
|
||
return text
|
||
|
||
|
||
async def recent_turns(
|
||
session: AsyncSession, conversation_id: str, limit: int = HISTORY_TURNS
|
||
) -> list[ConversationTurn]:
|
||
"""最近 limit 轮，按时间正序。当前这一轮（还没有答案）不算。"""
|
||
rows = list((await session.execute(
|
||
select(ConversationTurn)
|
||
.where(ConversationTurn.conversation_id == conversation_id)
|
||
.where(ConversationTurn.status != "running")
|
||
.order_by(ConversationTurn.seq.desc())
|
||
.limit(limit)
|
||
)).scalars())
|
||
return list(reversed(rows))
|
||
|
||
|
||
async def history_text(
|
||
session: AsyncSession, conversation_id: str | None, limit: int = HISTORY_TURNS
|
||
) -> str:
|
||
"""纯文本的问答历史，给运行时的图用（`{{ input.history }}`）。
|
||
|
||
管的是指代：用户问"它们平均多少"，图里的 agent 得知道"它们"是上一轮
|
||
那 12 家店。Copilot 侧的上下文解决不了这个——那只影响图长什么样，
|
||
不影响图跑起来的时候模型看到什么。
|
||
"""
|
||
if not conversation_id:
|
||
return ""
|
||
turns = await recent_turns(session, conversation_id, limit)
|
||
if not turns:
|
||
return ""
|
||
lines = [f"问：{t.question}\n答：{_answer_of(t)}" for t in turns if t.question]
|
||
return "\n\n".join(lines)
|