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ThearchyHelios
dcadc0c48b
三条 run（d983c4e6 / 14103db5 / 08c3de1c）在用户看来是一次对话，系统里却
毫无关联。查下来不是哪里传漏了，是整层缺失：
- 每轮 base_graph=None 从零建图，Copilot 不知道上一轮问过什么
- 每轮 thread_id = run.id，三条独立的 checkpoint 线程
- 前端 turns 只活在 zustand 里，刷新页面就全没了——那三轮当时在界面上
已经找不回来，只剩 runs 表里三条互不相干的记录
- 后端 13 张表里没有会话这个概念
加两张表（conversations / conversation_turns）。失败的轮次也记：只记成功的，
历史就成了一份美化过的记录，而人回来最想搞清楚的恰恰是上次卡在哪。
Copilot 的上下文带三样：前几轮问答、上一轮那张图（走 _slim 去掉坐标噪音）。
只给问答文字不够——"再按月份拆一下"会让模型重新设计一张图，实测经常接到另
一张表上，答案对不上前一轮。运行时另外注入 {{ 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。
左侧会话栏只在问数据页出现，可折叠、可改名删除，当前会话存 localStorage。
轮次按会话分桶缓存——切走再切回来要看得到原来的步骤，回源只拿得到问答。
历史轮次的执行过程不预加载，点「看执行过程」才取事件、走现成的 decodeRun。
画布右栏的 Copilot 依附工作流各有一条会话，连说两次"再加一个节点"能接上了
（base_graph 带的是图的结果，带不出"你刚才要我干什么"），但不进左侧列表。
过程中修掉的两个自己引入的坑：
- 第一版在列表为空时自动建一条会话。create 是异步的、StrictMode 把 effect
跑两遍，于是每次进页面都留下两三条"新对话"。改成用户开口那一刻按需建
- 加了"在上一轮的图上改"这条指令之后，模型照改图协议只发 update_node，
而问数据页这条路径的累加器从空图起步，操作全部落空，用户收到的是
"图校验未通过：图是空的，先拖一个节点进来"（会话 f5db9809 的第二轮，
而它的 explanation 证明上下文其实完全读懂了）。指令改成沿用 id 和 config
但完整重发，另加一道兜底：空图且上一轮有图时把操作重放到那张图上
check-ui 多一节「会话」：切换、刷新还在、逛一圈不多出空会话。
347 lines
12 KiB
Python
347 lines
12 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 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 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 Conversation, ConversationTurn
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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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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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created_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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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 _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=[TurnOut.model_validate(t) for t in turns],
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)
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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, f"会话 {conversation_id} 不存在")
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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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# 轮数和最后一问一次查完。每条会话各查一次的话，列表长了就是几十次往返
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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_seq = dict((await session.execute(
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select(ConversationTurn.conversation_id, func.max(ConversationTurn.seq))
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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_questions: dict[str, str] = {}
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if last_seq:
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pairs = list(last_seq.items())
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rows_q = list((await session.execute(
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select(ConversationTurn.conversation_id, ConversationTurn.seq, ConversationTurn.question)
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.where(ConversationTurn.conversation_id.in_([c for c, _ in pairs]))
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)).all())
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for conv_id, seq, question in rows_q:
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if last_seq.get(conv_id) == seq:
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last_questions[conv_id] = question or ""
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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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item.last_question = last_questions.get(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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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"):
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conversation.title = title_from(payload.question)
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await session.commit()
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await session.refresh(turn)
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return TurnOut.model_validate(turn)
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@router.patch("/{conversation_id}/turns/{turn_id}", response_model=TurnOut)
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async def patch_turn(
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conversation_id: str,
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turn_id: str,
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payload: TurnPatch,
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session: AsyncSession = Depends(get_session),
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) -> TurnOut:
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turn = await session.get(ConversationTurn, turn_id)
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if not turn or turn.conversation_id != conversation_id:
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raise HTTPException(404, f"轮次 {turn_id} 不存在")
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for field in ("question", "answer", "explanation", "graph", "run_id", "status", "error"):
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value = getattr(payload, field)
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if value is not None:
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setattr(turn, field, value)
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conversation = await session.get(Conversation, conversation_id)
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if conversation:
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conversation.last_active_at = utcnow()
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await session.commit()
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await session.refresh(turn)
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return TurnOut.model_validate(turn)
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# --------------------------------------------------------------------------
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# 给模型看的那一份
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# --------------------------------------------------------------------------
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def _answer_of(turn: ConversationTurn) -> str:
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"""这一轮的结果。问数据页是 answer，画布那条路径上只有 explanation。"""
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text = (turn.answer or turn.explanation or "").strip()
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if turn.status == "error" and turn.error:
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return f"（这一轮失败了：{turn.error[:200]}）"
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if len(text) > HISTORY_ANSWER_CHARS:
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return text[:HISTORY_ANSWER_CHARS] + "…（略）"
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return text
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async def recent_turns(
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session: AsyncSession, conversation_id: str, limit: int = HISTORY_TURNS
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) -> list[ConversationTurn]:
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"""最近 limit 轮，按时间正序。当前这一轮（还没有答案）不算。"""
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rows = list((await session.execute(
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select(ConversationTurn)
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.where(ConversationTurn.conversation_id == conversation_id)
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.where(ConversationTurn.status != "running")
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.order_by(ConversationTurn.seq.desc())
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.limit(limit)
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)).scalars())
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return list(reversed(rows))
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async def history_text(
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session: AsyncSession, conversation_id: str | None, limit: int = HISTORY_TURNS
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) -> str:
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"""纯文本的问答历史，给运行时的图用（`{{ input.history }}`）。
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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
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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，
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不影响图跑起来的时候模型看到什么。
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"""
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if not conversation_id:
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return ""
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turns = await recent_turns(session, conversation_id, limit)
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if not turns:
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return ""
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lines = [f"问：{t.question}\n答：{_answer_of(t)}" for t in turns if t.question]
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return "\n\n".join(lines)
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