242 lines
9.2 KiB
Python
242 lines
9.2 KiB
Python
"""Agent 编排（T-07 骨架 / T-04 Tool 节点）：LangGraph StateGraph + DeepSeek 对话。
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链路（FLOW §2）：tool（意图匹配→归属校验→只读查询→agent_tool_call 落库）
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→ llm（DeepSeek，工具结果注入上下文）→ guard（合规护栏）。四 Agent 能力
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边界（FLOW §4 与 MEMORY 禁止项）由 system prompt 固化：客户无投资建议/
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收益承诺/自动下单；代理人草稿不外发；分析只读；风控辅助不自动处置。
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Tool 节点（T-04）：一期关键词意图（tool_service.match_intent）仅对
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customer/advisor 分支查 Core RO（持仓/流水/L0）；customer_id 由会话注入，
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不来自 LLM。risk 分支四个风控 Tool 与 LLM intent 归 C1/C2（开发计划）。
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LLM 未配置（DEEPSEEK_API_KEY 为空）时降级：回复携带 Tool 查询摘要
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（演示链路不断且查询不白跑）；单测经 FakeLLM 注入，不依赖外网。
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"""
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from __future__ import annotations
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import threading
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from typing import Annotated, Any, TypedDict
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from langchain_core.messages import AIMessage, BaseMessage, HumanMessage, SystemMessage
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from langgraph.graph import END, START, StateGraph
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from operator import add
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from app.config.settings import settings
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from app.service import tool_service
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# 客户/对外口径的固定免责声明（随回复文本尾部输出；G-08 阻断响应另有两要素）
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CHAT_DISCLAIMER = "以上内容由 AI 生成，仅供业务参考，不构成投资建议。"
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# LLM 未配置时的降级回复（明确标注非模型生成，演示链路不断）
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_DEGRADED_PREFIX = "（LLM 未配置：请在 .env 设置 DEEPSEEK_API_KEY 后重启）"
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# 四 Agent 能力边界 system prompt（FLOW §4；MEMORY 禁止项固化）
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_SYSTEM_PROMPTS: dict[str, str] = {
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"customer": (
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"你是客户财富智能管家。仅服务当前登录客户本人；不得提供投资建议、"
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"收益承诺或自动下单；事实性数据须注明来源，无法回答时如实告知。"
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),
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"advisor": (
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"你是代理人助手，服务理财顾问。仅可讨论名下客户（归属经平台校验）；"
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"生成的草稿内容不会自动外发给客户；引用数据须可溯源。"
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),
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"analyst": (
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"你是数据分析助手。仅做只读查询与聚合分析，不写任何画像/预警/业务数据。"
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),
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"risk": (
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"你是风控监测助手。可查询预警台账与客户监测信息，输出仅供参考，"
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"最终处置须经风控专员通过处置接口人工完成；不得自动处置预警。"
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),
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}
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class ChatState(TypedDict):
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"""对话图状态（messages 由各节点以 add 归并，避免覆盖历史）。
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T-04 Tool 上下文：session_id/trace_id 供 agent_tool_call 落库；actor 为
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api/chat 展开的鉴权字段（{actor_id, roles, token_type}）；customer_id 为
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会话绑定客户（归属校验后的值，Tool 查询主体恒取此处）。
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"""
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agent_type: str
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history: list[dict]
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user_message: str
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messages: Annotated[list[BaseMessage], add]
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reply: str
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has_disclaimer: bool
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session_id: str | None
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trace_id: str | None
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actor: dict[str, Any] | None
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customer_id: str | None
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tool_results: list[dict]
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def _compose_messages(state: ChatState) -> list[BaseMessage]:
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"""system（角色边界）+ 工具结果（有则注入）+ 历史窗口 + 本轮用户消息。"""
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msgs: list[BaseMessage] = [
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SystemMessage(content=_SYSTEM_PROMPTS.get(state["agent_type"], _SYSTEM_PROMPTS["customer"]))
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]
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tool_text = tool_service.context_text(state.get("tool_results") or [])
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if tool_text:
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msgs.append(SystemMessage(content=tool_text))
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for m in state["history"]:
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role = m.get("role")
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content = m.get("content", "")
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if role == "user":
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msgs.append(HumanMessage(content=content))
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elif role == "assistant":
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msgs.append(AIMessage(content=content))
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msgs.append(HumanMessage(content=state["user_message"]))
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return msgs
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def tool_node(state: ChatState) -> dict[str, Any]:
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"""Tool 节点（T-04 + C2）：意图匹配 → tool_service.run_tool（校验+落库）。
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守卫（C2 放宽）：会话与 actor 恒为必需；requires_customer=False 的 Tool
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（如 alert_query 全量待审）允许无绑定客户运行——否则 risk_officer 查
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"今天有多少待审预警"（A-6）会被 customer_id 空缺拦死。requires_customer
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为 True 的 Tool 仍需绑定客户（无则空转，由 run_tool 判
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TOOL_BLOCKED_NO_CUSTOMER）。
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"""
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if not (state.get("session_id") and state.get("actor")):
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return {"tool_results": []}
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tool_name = tool_service.match_intent(state["agent_type"], state["user_message"])
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if tool_name is None:
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return {"tool_results": []}
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spec = tool_service.get_registered_tool(tool_name)
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if spec is None:
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return {"tool_results": []}
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if spec.get("requires_customer") and not state.get("customer_id"):
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return {"tool_results": []}
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# 带参 Tool（T21 知识库）：spec 白名单声明了 "query" → 由代码注入用户消息
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# （一期 tool_input 恒来自代码，不来自 LLM 输出，与 T-04 口径一致）
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whitelist = tuple(spec.get("param_whitelist") or ())
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tool_input = {"query": state["user_message"]} if "query" in whitelist else None
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record = tool_service.run_tool(
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tool_name=tool_name,
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agent_type=state["agent_type"],
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actor=state["actor"],
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customer_id=state.get("customer_id") or "",
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tool_input=tool_input,
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session_id=state["session_id"],
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trace_id=state.get("trace_id"),
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)
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return {"tool_results": [record]}
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def llm_node(state: ChatState) -> dict[str, Any]:
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"""组装 messages 后调 LLM；未配置 key 时降级（不抛异常，演示链路不断）。
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降级回复携带 Tool 查询摘要（T-04：无 LLM 时查询不白跑，结果直出）。
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"""
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messages = _compose_messages(state)
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if not settings.deepseek_api_key:
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summaries = [tool_service.summarize(r) for r in (state.get("tool_results") or [])]
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reply = (
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f"{_DEGRADED_PREFIX}\n" + "\n".join(summaries)
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if summaries
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else f"{_DEGRADED_PREFIX}已收到您的消息：{state['user_message']}"
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)
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return {"messages": messages + [AIMessage(content=reply)], "reply": reply}
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llm = _get_llm()
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result = llm.invoke(messages)
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return {"messages": messages + [result], "reply": result.content}
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def guard_node(state: ChatState) -> dict[str, Any]:
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"""合规护栏：对外角色（customer/risk，未知类型 fail-safe 按最严口径）附免责声明。"""
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external = state["agent_type"] in ("customer", "risk") or state["agent_type"] not in _SYSTEM_PROMPTS
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if external:
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return {"reply": f"{state['reply']}\n\n{CHAT_DISCLAIMER}", "has_disclaimer": True}
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return {"has_disclaimer": False}
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def build_graph():
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"""StateGraph：START → tool → llm → guard → END（T-04 接入 Tool 节点）。"""
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graph = StateGraph(ChatState)
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graph.add_node("tool", tool_node)
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graph.add_node("llm", llm_node)
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graph.add_node("guard", guard_node)
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graph.add_edge(START, "tool")
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graph.add_edge("tool", "llm")
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graph.add_edge("llm", "guard")
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graph.add_edge("guard", END)
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return graph.compile()
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_graph = None
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_graph_lock = threading.Lock()
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_llm: Any | None = None
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_llm_lock = threading.Lock()
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def _get_graph():
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global _graph
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with _graph_lock:
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if _graph is None:
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_graph = build_graph()
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return _graph
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def _get_llm() -> Any:
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"""DeepSeek 经 langchain-openai 兼容接口（懒构造加锁；测试注入 _llm）。"""
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global _llm
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with _llm_lock:
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if _llm is None:
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from langchain_openai import ChatOpenAI
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_llm = ChatOpenAI(
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model="deepseek-chat",
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api_key=settings.deepseek_api_key,
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base_url=settings.deepseek_base_url,
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temperature=0.3,
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)
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return _llm
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def chat(
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agent_type: str,
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history: list[dict],
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user_message: str,
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*,
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session_id: str | None = None,
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trace_id: str | None = None,
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actor: dict[str, Any] | None = None,
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customer_id: str | None = None,
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) -> dict[str, Any]:
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"""对话入口（T-06 api/chat 调用）：返回 {reply, has_disclaimer}。
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T-04：session 上下文（session_id/trace_id/actor/customer_id）可选传入；
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缺省时 Tool 节点空转（既有用例与纯闲聊不受影响）。
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"""
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final = _get_graph().invoke(
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{
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"agent_type": agent_type,
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"history": history,
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"user_message": user_message,
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"messages": [],
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"reply": "",
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"has_disclaimer": False,
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"session_id": session_id,
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"trace_id": trace_id,
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"actor": actor,
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"customer_id": customer_id,
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"tool_results": [],
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}
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)
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return {
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"reply": final["reply"],
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"has_disclaimer": final["has_disclaimer"],
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"tool_results": final.get("tool_results") or [],
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}
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def reset_cache() -> None:
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"""测试隔离出口：清空图与 LLM 单例缓存。"""
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global _graph, _llm
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with _graph_lock:
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_graph = None
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_llm = None
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