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ThearchyHelios
5ac681c481
此前 Copilot 的模型是兜底猜的：取第一个非 mock 且启用的 provider 的
默认模型。后端 GenerateIn 一直有 provider/model 字段，但前端从没传过，
于是禁用某个 provider 或调整创建顺序就会让 Copilot 静默换模型。
现在是独立设置（Setting 表 copilot 键），优先级：单次请求显式指定 >
保存的 Copilot 专用模型 > provider 兜底。做成独立设置是因为 Copilot
写的是编排本身，对指令遵循的要求和工作流节点不是一回事。
新增 GET/PUT /api/copilot/model 读写设置，并回报 effective_model
（区分显式配置与兜底）；generate / generate-stream / explain 三处
统一走 copilot_model_spec；流首帧发 {op:'model'} 告知实际所用模型，
画布浮条上直接显示，不用猜。
前端 Copilot 弹窗加模型选择器，选择即持久化，下次打开记住；说明里
点明它只影响 Copilot 自己、且指令遵循弱的模型（如 Mock）跑不出结果。
验证：兜底→claude-opus-5；设为 deepseek-chat 后流首帧回报一致；
单次请求传 claude-opus-5 可覆盖设置；清空恢复兜底。浏览器实测选择
持久化跨弹窗、浮条显示模型名。
652 lines
26 KiB
Python
652 lines
26 KiB
Python
from __future__ import annotations
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import json
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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.ext.asyncio import AsyncSession
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from app.db.base import get_session
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from app.db.models import Workflow
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from app.engine.schema import GraphSpec, NodeType, validate_graph
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from app.engine.state import message_text
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from app.providers.factory import ModelSpec, ProviderNotConfigured, get_chat_model
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from app.tools.registry import all_specs
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router = APIRouter(prefix="/api/copilot", tags=["copilot"])
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NODE_REFERENCE = """\
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可用节点类型（type 字段）：
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- input：入口。config.fields = [{name, required, default, description}]
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- output：出口，收集最终成果。config.fields = [{name, value}]，value 里写模板引用
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- llm：单次模型调用。config: {system, prompt, model, temperature, max_tokens, assign_to, output_schema}
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- agent：带工具循环的 agent。config: {system, prompt, tools:[工具名], max_steps, approval, assign_to}
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- supervisor：多 agent 协作。config: {goal, agents:[{name, description, system, tools, model}], max_rounds}
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- tool：直接调一个工具。config: {tool: 工具名, args: {...}, assign_to}
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- code：沙箱里跑代码。config: {language: python|bash|node, code, timeout, network, assign_to}
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- branch：条件分支。config: {mode: expression|llm, cases:[{key, condition, label}]}
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- loop：循环。config: {mode: foreach|while, items, item_var, condition, max_iterations}
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- retrieve：知识库检索。config: {query, collection, limit, assign_to}
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- memory：长期记忆读写。config: {action: recall|write, query, content, scope, assign_to}
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- human：人工介入。config: {mode: approve|input|edit, title, message}
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- validate：JSON Schema 校验，可自动让模型修复。config: {schema, source, max_retries}
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- transform：数据整形。config: {mode: expression|template|json, expression/template, assign_to}
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- subgraph：嵌套另一个工作流。config: {workflow_id, input}
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模板语法（在任意字符串里用）：
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- {{ input.字段名 }} 入口输入
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- {{ vars.变量名 }} 某节点 assign_to 写入的变量
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- {{ nodes.节点id.text }} 某节点的输出
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- {{ last_message }} 最近一条消息文本
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- 过滤器：{{ vars.x | json }}
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连线规则：
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- edges 里每条边 {source, target, sourceHandle?}
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- branch 节点的出边必须带 sourceHandle，取值是 cases 里的 key，另外要有一条 sourceHandle="default" 兜底
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- loop 节点：sourceHandle="body" 连循环体，循环体最后一个节点再连回 loop 节点；sourceHandle="done" 连循环结束后的去向
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- human 节点（approve 模式）：sourceHandle 用 "approved" 和 "rejected"
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- 一个节点连出多条普通边 = 并行执行，多条边汇入同一节点 = 等待汇聚
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"""
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def auto_layout(spec: GraphSpec, *, x_gap: int = 300, y_gap: int = 150) -> GraphSpec:
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"""按拓扑层级排版。
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模型生成的图只有结构没有坐标，全堆在原点就没法看了。
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这里按最长路径分层：同层的节点竖排，层与层横向铺开。
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"""
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nodes = spec.node_map()
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depth: dict[str, int] = {}
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def compute(node_id: str, seen: frozenset[str]) -> int:
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if node_id in depth:
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return depth[node_id]
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if node_id in seen: # 环：就地截断，避免递归爆栈
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return 0
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incoming = [e.source for e in spec.incoming(node_id) if e.source in nodes]
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value = 0 if not incoming else 1 + max(
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compute(src, seen | {node_id}) for src in incoming
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)
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depth[node_id] = value
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return value
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for node in spec.nodes:
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compute(node.id, frozenset())
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by_level: dict[int, list[str]] = {}
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for node_id, level in depth.items():
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by_level.setdefault(level, []).append(node_id)
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for level, ids in sorted(by_level.items()):
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offset = -(len(ids) - 1) * y_gap / 2
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for i, node_id in enumerate(sorted(ids)):
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node = nodes[node_id]
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node.position.x = 80 + level * x_gap
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node.position.y = 300 + offset + i * y_gap
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return spec
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class GenerateIn(BaseModel):
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instruction: str = Field(min_length=1, description="用自然语言描述想要的工作流")
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base_graph: dict[str, Any] | None = Field(default=None, description="在现有图上修改时传入")
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provider: str | None = None
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model: str | None = None
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COPILOT_SETTING_KEY = "copilot"
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async def copilot_model_spec(
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session: AsyncSession, payload: GenerateIn, *, max_tokens: int = 8192
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) -> ModelSpec:
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"""决定 Copilot 用哪个模型。
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优先级：本次请求显式指定 > 设置里存的 Copilot 专用模型 > provider 兜底。
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做成独立设置是因为 Copilot 是元任务——它写的是编排本身，对指令遵循的要求
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和工作流里的节点不是一回事，值得单独选，而不是跟着"第一个启用的 provider"漂。
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"""
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from app.db.models import Setting
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provider, model = payload.provider, payload.model
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if not provider and not model:
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row = await session.get(Setting, COPILOT_SETTING_KEY)
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saved = row.value if row else {}
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provider = saved.get("provider") or None
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model = saved.get("model") or None
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return ModelSpec(provider=provider, model=model, max_tokens=max_tokens)
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@router.get("/model")
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async def get_copilot_model(session: AsyncSession = Depends(get_session)) -> dict[str, Any]:
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"""当前 Copilot 会用哪个模型，以及是显式配的还是兜底来的。"""
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from app.db.models import Setting
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from app.providers.factory import resolve_provider
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row = await session.get(Setting, COPILOT_SETTING_KEY)
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saved = row.value if row else {}
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configured = bool(saved.get("provider") or saved.get("model"))
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resolved = await resolve_provider(session, saved.get("provider"), saved.get("model"))
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return {
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"configured": configured,
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"provider": saved.get("provider") or None,
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"model": saved.get("model") or None,
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"effective_provider": resolved.name if resolved else None,
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"effective_model": saved.get("model") or (resolved.default_model if resolved else None),
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}
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class CopilotModelIn(BaseModel):
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provider: str | None = None
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model: str | None = None
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@router.put("/model")
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async def set_copilot_model(
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payload: CopilotModelIn, session: AsyncSession = Depends(get_session)
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) -> dict[str, Any]:
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"""设定 Copilot 专用模型。两个字段都留空即恢复兜底。"""
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from app.db.models import Setting
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value = {"provider": payload.provider or "", "model": payload.model or ""}
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row = await session.get(Setting, COPILOT_SETTING_KEY)
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if row:
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row.value = value
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else:
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session.add(Setting(key=COPILOT_SETTING_KEY, value=value))
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await session.commit()
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return await get_copilot_model(session)
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class GenerateOut(BaseModel):
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graph: dict[str, Any]
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explanation: str = ""
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issues: list[dict[str, Any]] = Field(default_factory=list)
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GRAPH_SCHEMA: dict[str, Any] = {
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"title": "workflow_graph", # langchain 靠 title 识别 JSON Schema dict
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"type": "object",
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"properties": {
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"explanation": {"type": "string", "description": "一两句话说明这张图怎么跑"},
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"nodes": {
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"type": "array",
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"items": {
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"type": "object",
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"properties": {
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"id": {"type": "string"},
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"type": {"type": "string", "enum": [t.value for t in NodeType]},
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"label": {"type": "string"},
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"config": {"type": "object"},
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},
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"required": ["id", "type"],
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},
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},
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"edges": {
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"type": "array",
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"items": {
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"type": "object",
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"properties": {
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"source": {"type": "string"},
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"target": {"type": "string"},
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"sourceHandle": {"type": "string"},
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},
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"required": ["source", "target"],
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},
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},
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},
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"required": ["nodes", "edges"],
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}
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@router.post("/generate", response_model=GenerateOut)
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async def generate(
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payload: GenerateIn, session: AsyncSession = Depends(get_session)
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) -> GenerateOut:
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"""用自然语言生成或改写一张工作流图。
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产物会经过和手工编排完全相同的校验与排版，所以生成完就是可运行、可读的，
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而不是一段还要人去修的 JSON。
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"""
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tool_list = "\n".join(
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f"- {name}（{spec.category}）：{spec.description}"
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for name, spec in sorted(all_specs().items())
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)
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system = (
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"你是一个 agent 工作流编排专家。根据用户需求产出一张可执行的工作流图。\n\n"
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f"{NODE_REFERENCE}\n\n可用工具：\n{tool_list}\n\n"
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"要求：\n"
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"1. 必须有且只有一个 input 节点和至少一个 output 节点\n"
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"2. 节点 id 用简短英文小写下划线，例如 fetch_data、summarize\n"
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"3. 每个节点写清楚 label（中文），让人在画布上一眼看懂它干什么\n"
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"4. 需要把结果传给下游时，用 assign_to 命名变量，下游用 {{ vars.变量名 }} 引用\n"
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"5. 不要凭空发明工具名，只能用上面列出的\n"
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"6. 结构尽量简单：能用 3 个节点解决就别堆 8 个"
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)
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if payload.base_graph and payload.base_graph.get("nodes"):
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user = (
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"这是当前的工作流：\n"
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f"{json.dumps(_slim(payload.base_graph), ensure_ascii=False, indent=2)}\n\n"
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f"请按下面的要求修改它，返回完整的新图（不是补丁）：\n{payload.instruction}"
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)
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else:
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user = f"请设计一个工作流：{payload.instruction}"
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try:
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model, _ = await get_chat_model(session, await copilot_model_spec(session, payload))
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except ProviderNotConfigured as e:
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raise HTTPException(400, str(e)) from e
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messages = [("system", system), ("human", user)]
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try:
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raw = await model.with_structured_output(GRAPH_SCHEMA).ainvoke(messages)
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if not isinstance(raw, dict):
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raw = json.loads(message_text(raw))
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except Exception: # noqa: BLE001 - 不支持结构化输出的模型退回文本解析
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try:
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text = message_text(await model.ainvoke(messages))
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raw = _extract_json(text)
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except Exception as e: # noqa: BLE001
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raise HTTPException(502, f"模型没有返回可用的图：{type(e).__name__}: {e}") from e
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graph = {
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"nodes": [
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{
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"id": n.get("id") or f"node{i}",
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"type": n.get("type") or "llm",
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"position": {"x": 0, "y": 0},
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"data": {"label": n.get("label") or "", "config": n.get("config") or {}},
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}
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for i, n in enumerate(raw.get("nodes") or [])
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],
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"edges": [
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{
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"source": e.get("source", ""),
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"target": e.get("target", ""),
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"sourceHandle": e.get("sourceHandle"),
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}
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for e in (raw.get("edges") or [])
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],
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}
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try:
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spec = GraphSpec.model_validate(graph)
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except Exception as e: # noqa: BLE001
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raise HTTPException(502, f"生成的图结构非法：{e}") from e
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spec = auto_layout(spec)
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report = validate_graph(spec)
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return GenerateOut(
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graph=spec.model_dump(mode="json"),
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explanation=str(raw.get("explanation", "")),
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issues=[i.model_dump() for i in report.issues],
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)
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# --------------------------------------------------------------------------
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# 流式生成：模型输出逐行操作流（NDJSON），画布看着图长出来
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# --------------------------------------------------------------------------
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_STREAM_PROTOCOL = """\
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输出格式（严格遵守）：
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- 每行一个完整的 JSON 对象，除此之外不输出任何东西——不要 markdown 围栏、不要解释文字、不要空行注释
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- 可用操作：
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{"op":"plan","summary":"一句话说明打算怎么搭"} ← 第一行
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{"op":"add_node","node":{"id":"...","type":"...","label":"中文标签","config":{...}}}
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{"op":"update_node","id":"...","label":"...","config":{...}} ← 修改现有节点（config 整体替换）
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{"op":"remove_node","id":"..."}
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{"op":"add_edge","edge":{"source":"...","target":"...","sourceHandle":"..."}}
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{"op":"remove_edge","source":"...","target":"...","sourceHandle":"..."}
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{"op":"done","explanation":"两三句话说明这张图怎么跑"} ← 最后一行
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- 按执行顺序添加节点（先入口后出口）；每加一个节点，立刻把连向它的边（两端都已存在的）输出出来，让图连贯地生长
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- 修改现有图时只输出改动，没提到的节点不要动"""
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def _parse_op_line(line: str) -> dict[str, Any] | None:
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"""解析一行操作。围栏行、空行、解析失败、缺 op 的一律返回 None——
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模型偶尔犯规不该毁掉整条流，跳过就是。"""
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text = line.strip()
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if not text or text.startswith("```"):
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return None
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try:
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obj = json.loads(text)
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except json.JSONDecodeError:
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return None
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if not isinstance(obj, dict) or "op" not in obj:
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return None
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return obj
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def _apply_op(nodes: dict[str, dict[str, Any]], edges: list[dict[str, Any]], op: dict[str, Any]) -> bool:
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"""把一个操作应用到服务端维护的图状态。返回是否真的改了图。"""
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kind = op.get("op")
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if kind == "add_node":
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node = op.get("node") or {}
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if not node.get("id") or not node.get("type"):
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return False
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nodes[node["id"]] = {
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"id": node["id"],
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"type": node["type"],
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"position": {"x": 0, "y": 0},
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"data": {"label": node.get("label") or "", "config": node.get("config") or {}},
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}
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return True
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if kind == "update_node":
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node = nodes.get(op.get("id") or "")
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if not node:
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return False
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if op.get("label") is not None:
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node["data"]["label"] = op["label"]
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if op.get("config") is not None:
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node["data"]["config"] = op["config"]
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return True
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if kind == "remove_node":
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node_id = op.get("id")
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if node_id not in nodes:
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return False
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nodes.pop(node_id)
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edges[:] = [e for e in edges if e["source"] != node_id and e["target"] != node_id]
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return True
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if kind == "add_edge":
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edge = op.get("edge") or {}
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if not edge.get("source") or not edge.get("target"):
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return False
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edges.append(
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{
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"source": edge["source"],
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"target": edge["target"],
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"sourceHandle": edge.get("sourceHandle"),
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}
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)
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return True
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if kind == "remove_edge":
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before = len(edges)
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edges[:] = [
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e
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for e in edges
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if not (
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e["source"] == op.get("source")
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and e["target"] == op.get("target")
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and (op.get("sourceHandle") is None or e.get("sourceHandle") == op.get("sourceHandle"))
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)
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]
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return len(edges) != before
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return False
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async def _iter_ops(model: Any, messages: list[Any]):
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"""流式读模型输出，按行切出操作。done 之后即停——后面就算有闲话也不要了。"""
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from app.engine.state import message_text as _text
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buffer = ""
|
||
async for chunk in model.astream(messages):
|
||
buffer += _text(chunk)
|
||
while "\n" in buffer:
|
||
line, buffer = buffer.split("\n", 1)
|
||
op = _parse_op_line(line)
|
||
if op:
|
||
yield op
|
||
if op.get("op") == "done":
|
||
return
|
||
op = _parse_op_line(buffer)
|
||
if op:
|
||
yield op
|
||
|
||
|
||
@router.post("/generate-stream")
|
||
async def generate_stream(payload: GenerateIn, session: AsyncSession = Depends(get_session)):
|
||
"""流式版生成：SSE 逐操作推送，前端边收边把节点摆上画布。
|
||
|
||
结束时（done 或流断）发一条 final：服务端把累积的图排版、校验后整体给出——
|
||
过程可见性来自操作流，最终质量仍由和手工编排相同的 layout + validate 保证。
|
||
"""
|
||
from fastapi.responses import StreamingResponse
|
||
|
||
tool_list = "\n".join(
|
||
f"- {name}（{spec.category}）：{spec.description}"
|
||
for name, spec in sorted(all_specs().items())
|
||
)
|
||
system = (
|
||
"你是一个 agent 工作流编排专家。根据用户需求，以操作流的方式逐步搭出一张可执行的工作流图。\n\n"
|
||
f"{NODE_REFERENCE}\n\n可用工具：\n{tool_list}\n\n"
|
||
"结构要求：\n"
|
||
"1. 必须有且只有一个 input 节点和至少一个 output 节点\n"
|
||
"2. 节点 id 用简短英文小写下划线；label 用中文，一眼看懂\n"
|
||
"3. 用 assign_to 传结果，下游 {{ vars.变量名 }} 引用\n"
|
||
"4. 只能用上面列出的工具名\n"
|
||
"5. 能用 3 个节点解决就别堆 8 个\n\n"
|
||
f"{_STREAM_PROTOCOL}"
|
||
)
|
||
|
||
# 现有图状态：修改场景从 base_graph 起步，新建场景从空图起步
|
||
nodes: dict[str, dict[str, Any]] = {}
|
||
edges: list[dict[str, Any]] = []
|
||
if payload.base_graph and payload.base_graph.get("nodes"):
|
||
for n in payload.base_graph["nodes"]:
|
||
nodes[n["id"]] = n
|
||
edges = [
|
||
{k: v for k, v in e.items() if k in ("source", "target", "sourceHandle")}
|
||
for e in payload.base_graph.get("edges") or []
|
||
]
|
||
user = (
|
||
"这是当前的工作流：\n"
|
||
f"{json.dumps(_slim(payload.base_graph), ensure_ascii=False, indent=2)}\n\n"
|
||
f"请按下面的要求修改它（只输出改动操作）：\n{payload.instruction}"
|
||
)
|
||
else:
|
||
user = f"请设计一个工作流：{payload.instruction}"
|
||
|
||
try:
|
||
spec_ = await copilot_model_spec(session, payload)
|
||
model, model_id = await get_chat_model(session, spec_)
|
||
except ProviderNotConfigured as e:
|
||
raise HTTPException(400, str(e)) from e
|
||
|
||
messages = [("system", system), ("human", user)]
|
||
|
||
async def event_stream():
|
||
explanation = ""
|
||
yield f"data: {json.dumps({'op': 'model', 'model': model_id}, ensure_ascii=False)}\n\n"
|
||
try:
|
||
async for op in _iter_ops(model, messages):
|
||
if op.get("op") == "done":
|
||
explanation = str(op.get("explanation", ""))
|
||
changed = _apply_op(nodes, edges, op)
|
||
if changed or op.get("op") in ("plan", "done"):
|
||
yield f"data: {json.dumps(op, ensure_ascii=False)}\n\n"
|
||
except Exception as e: # noqa: BLE001
|
||
yield f"data: {json.dumps({'op': 'error', 'message': f'{type(e).__name__}: {e}'}, ensure_ascii=False)}\n\n"
|
||
return
|
||
|
||
# 收尾：排版 + 校验，把最终图整体交付
|
||
try:
|
||
spec = auto_layout(
|
||
GraphSpec.model_validate({"nodes": list(nodes.values()), "edges": edges})
|
||
)
|
||
issues = [i.model_dump() for i in validate_graph(spec).issues]
|
||
final = {
|
||
"op": "final",
|
||
"graph": spec.model_dump(mode="json"),
|
||
"issues": issues,
|
||
"explanation": explanation,
|
||
}
|
||
except Exception as e: # noqa: BLE001
|
||
final = {"op": "error", "message": f"生成的图结构非法：{e}"}
|
||
yield f"data: {json.dumps(final, ensure_ascii=False)}\n\n"
|
||
|
||
return StreamingResponse(
|
||
event_stream(),
|
||
media_type="text/event-stream",
|
||
headers={"Cache-Control": "no-cache", "X-Accel-Buffering": "no"},
|
||
)
|
||
|
||
|
||
class FromRunIn(BaseModel):
|
||
run_id: str
|
||
name: str = ""
|
||
|
||
|
||
@router.post("/from-run")
|
||
async def extract_template(
|
||
payload: FromRunIn, session: AsyncSession = Depends(get_session)
|
||
) -> dict[str, Any]:
|
||
"""轨迹 → 模板：把一次探索性运行实际走过的路径提取成草稿工作流。
|
||
|
||
探索层的价值不在单次答案，而在"跑通的路径能沉淀为资产"。
|
||
提取是确定性的：只保留真正执行过的节点和它们之间的边，分支上
|
||
没走的岔路剪掉；输入值参数化成 input 字段默认值。产物落成 draft，
|
||
人审、改名、发布之后才成为正式模板——提取器是模板的作者，不是发布者。
|
||
"""
|
||
from sqlalchemy import select as _sel
|
||
|
||
from app.api.copilot import auto_layout # 自引用仅为显式
|
||
from app.db.models import Run, RunEvent, Workflow, WorkflowVersion
|
||
from app.core.artifact_store import graph_hash
|
||
|
||
run = await session.get(Run, payload.run_id)
|
||
if not run:
|
||
raise HTTPException(404, "运行记录不存在")
|
||
if not run.graph.get("nodes"):
|
||
raise HTTPException(400, "这次运行没有保存图快照，无法提取")
|
||
|
||
events = list(
|
||
(
|
||
await session.execute(
|
||
_sel(RunEvent).where(RunEvent.run_id == run.id).order_by(RunEvent.seq)
|
||
)
|
||
).scalars()
|
||
)
|
||
executed = {e.node_id for e in events if e.type == "node.started" and e.node_id}
|
||
taken = {
|
||
(e.node_id, str((e.data or {}).get("branch")))
|
||
for e in events
|
||
if e.type == "edge.taken" and e.node_id
|
||
}
|
||
if not executed:
|
||
raise HTTPException(400, "事件流里没有节点执行记录")
|
||
|
||
spec = GraphSpec.model_validate(run.graph)
|
||
kept_nodes = [n for n in spec.nodes if n.id in executed]
|
||
kept_ids = {n.id for n in kept_nodes}
|
||
kept_edges = []
|
||
for edge in spec.edges:
|
||
if edge.source not in kept_ids or edge.target not in kept_ids:
|
||
continue
|
||
# 分支/循环节点：只保留实际走过的出口，没走的岔路不进模板
|
||
source_node = spec.node_map().get(edge.source)
|
||
if source_node and source_node.type in (NodeType.BRANCH,) and edge.sourceHandle:
|
||
if (edge.source, edge.sourceHandle) not in taken:
|
||
continue
|
||
kept_edges.append(edge)
|
||
|
||
# 输入参数化：实际输入值变成字段默认值
|
||
for node in kept_nodes:
|
||
if node.type.value == "input":
|
||
node.data.config["fields"] = [
|
||
{"name": key, "default": value if isinstance(value, (str, int, float)) else json.dumps(value, ensure_ascii=False)}
|
||
for key, value in (run.input or {}).items()
|
||
] or node.data.config.get("fields", [])
|
||
|
||
draft_spec = auto_layout(
|
||
GraphSpec(nodes=kept_nodes, edges=kept_edges, defaults=spec.defaults)
|
||
)
|
||
graph = draft_spec.model_dump(mode="json")
|
||
workflow = Workflow(
|
||
name=payload.name or f"{run.workflow_name or '探索'}·提取模板",
|
||
description=f"从运行 {run.id[:8]} 的实际执行路径提取（{len(kept_nodes)} 节点），待人审后发布",
|
||
graph=graph,
|
||
tags=["extracted"],
|
||
status="draft",
|
||
)
|
||
session.add(workflow)
|
||
await session.flush()
|
||
session.add(
|
||
WorkflowVersion(
|
||
workflow_id=workflow.id, version=1, graph=graph,
|
||
graph_hash=graph_hash(graph), note=f"自运行 {run.id} 提取",
|
||
)
|
||
)
|
||
await session.commit()
|
||
return {
|
||
"workflow_id": workflow.id,
|
||
"name": workflow.name,
|
||
"nodes": len(kept_nodes),
|
||
"edges": len(kept_edges),
|
||
"dropped_nodes": len(spec.nodes) - len(kept_nodes),
|
||
"source_run": run.id,
|
||
}
|
||
|
||
|
||
class ExplainIn(BaseModel):
|
||
graph: dict[str, Any]
|
||
provider: str | None = None
|
||
model: str | None = None
|
||
|
||
|
||
@router.post("/explain")
|
||
async def explain(
|
||
payload: ExplainIn, session: AsyncSession = Depends(get_session)
|
||
) -> dict[str, str]:
|
||
"""用大白话讲清楚一张图在干什么。接手别人的编排时很有用。"""
|
||
try:
|
||
model, _ = await get_chat_model(
|
||
session,
|
||
await copilot_model_spec(
|
||
session,
|
||
GenerateIn(instruction="_", provider=payload.provider, model=payload.model),
|
||
max_tokens=2048,
|
||
),
|
||
)
|
||
except ProviderNotConfigured as e:
|
||
raise HTTPException(400, str(e)) from e
|
||
|
||
prompt = (
|
||
"用中文解释下面这个 agent 工作流：它解决什么问题、数据怎么流动、"
|
||
"有哪些分支和风险点。用简洁的分点说明，不要复述 JSON。\n\n"
|
||
f"{json.dumps(_slim(payload.graph), ensure_ascii=False, indent=2)}"
|
||
)
|
||
return {"explanation": message_text(await model.ainvoke(prompt))}
|
||
|
||
|
||
@router.post("/layout")
|
||
async def relayout(payload: ExplainIn) -> dict[str, Any]:
|
||
"""一键整理画布。"""
|
||
spec = GraphSpec.model_validate(payload.graph)
|
||
return auto_layout(spec).model_dump(mode="json")
|
||
|
||
|
||
def _slim(graph: dict[str, Any]) -> dict[str, Any]:
|
||
"""喂给模型时去掉坐标之类的噪音，省 token 也省得它被干扰。"""
|
||
return {
|
||
"nodes": [
|
||
{
|
||
"id": n.get("id"),
|
||
"type": n.get("type"),
|
||
"label": (n.get("data") or {}).get("label"),
|
||
"config": (n.get("data") or {}).get("config"),
|
||
}
|
||
for n in graph.get("nodes") or []
|
||
],
|
||
"edges": [
|
||
{k: v for k, v in e.items() if k in ("source", "target", "sourceHandle") and v}
|
||
for e in graph.get("edges") or []
|
||
],
|
||
}
|
||
|
||
|
||
def _extract_json(text: str) -> dict[str, Any]:
|
||
text = text.strip()
|
||
if text.startswith("```"):
|
||
lines = text.splitlines()
|
||
text = "\n".join(lines[1 : -1 if lines[-1].strip().startswith("```") else None])
|
||
start = text.find("{")
|
||
for end in range(len(text), start, -1):
|
||
try:
|
||
return json.loads(text[start:end])
|
||
except json.JSONDecodeError:
|
||
continue
|
||
raise ValueError("模型输出里找不到 JSON")
|