Add Cloud Tour Libo knowledge graph platform
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343
app/api/mcp_server.py
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343
app/api/mcp_server.py
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"""Minimal MCP Streamable HTTP adapter for Baixinghui customer-service tools."""
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from __future__ import annotations
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import json
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import os
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import time
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import uuid
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from typing import Any
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from fastapi import APIRouter, Request
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from fastapi.responses import JSONResponse, Response, StreamingResponse
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from app.api.travel_assistant import _customer_service_query_response
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router = APIRouter()
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MCP_PROTOCOL_VERSION = "2025-06-18"
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SUPPORTED_MCP_PROTOCOL_VERSIONS = {"2024-11-05", "2025-03-26", MCP_PROTOCOL_VERSION}
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DEFAULT_GRAPH_NAME = "baixinghui_travel_agency"
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def _tool_definitions() -> list[dict[str, Any]]:
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return [
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{
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"name": "ask_customer_service",
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"description": (
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"向百姓惠旅行社知识图谱智能客服提问。适用于线路价格、行程天数、景区、酒店、费用、车型、"
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"线路推荐和复杂多跳问答。只读工具，不承诺最终价格、余位、房型或景区政策。"
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),
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"inputSchema": {
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"type": "object",
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"properties": {
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"question": {"type": "string", "description": "用户自然语言问题"},
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"session_id": {"type": "string", "description": "外部会话 ID，可选"},
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"request_id": {"type": "string", "description": "外部请求 ID，可选"},
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"customer_context": {
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"type": "object",
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"description": "客户上下文，例如人数、预算、出发日期、偏好，可选",
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},
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},
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"required": ["question"],
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},
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},
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{
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"name": "query_route_price",
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"description": "查询指定旅行线路的参考价格、成人/儿童价格区间和不可直接承诺事项。只读工具。",
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"inputSchema": {
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"type": "object",
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"properties": {
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"route_name": {"type": "string", "description": "线路名称或关键词，例如 黄小西三日游"},
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"traveler_type": {
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"type": "string",
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"description": "游客类型，可选，例如 成人、儿童、老人",
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},
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"session_id": {"type": "string", "description": "外部会话 ID，可选"},
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},
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"required": ["route_name"],
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},
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},
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{
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"name": "list_travel_routes",
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"description": "查询百姓惠旅行线路清单，可按天数、景区或关键词筛选。只读工具。",
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"inputSchema": {
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"type": "object",
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"properties": {
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"keyword": {"type": "string", "description": "线路或目的地关键词，可选"},
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"duration_days": {"type": "integer", "description": "期望天数，可选"},
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"limit": {"type": "integer", "description": "返回条数上限，可选，默认 20"},
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"session_id": {"type": "string", "description": "外部会话 ID，可选"},
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},
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},
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},
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{
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"name": "query_route_detail",
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"description": "查询某条线路的天数、价格、景区、附近酒店和费用边界。只读工具。",
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"inputSchema": {
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"type": "object",
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"properties": {
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"route_name": {"type": "string", "description": "线路名称或关键词"},
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"detail_focus": {
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"type": "string",
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"description": "关注点，可选，例如 价格、景区、酒店、费用、车型",
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},
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"session_id": {"type": "string", "description": "外部会话 ID，可选"},
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},
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"required": ["route_name"],
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},
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},
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{
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"name": "compare_routes",
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"description": "对比两条旅行线路的适配度、景点数量、轻松程度或客服推荐理由。只读工具。",
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"inputSchema": {
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"type": "object",
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"properties": {
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"route_a": {"type": "string", "description": "第一条线路名称或关键词"},
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"route_b": {"type": "string", "description": "第二条线路名称或关键词"},
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"compare_focus": {
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"type": "string",
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"description": "对比关注点，例如 老人小孩、不太累、景点更多、价格",
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},
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"session_id": {"type": "string", "description": "外部会话 ID，可选"},
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},
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"required": ["route_a", "route_b"],
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},
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},
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]
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def _json_rpc_result(message_id: Any, result: dict[str, Any]) -> dict[str, Any]:
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return {"jsonrpc": "2.0", "id": message_id, "result": result}
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def _json_rpc_error(message_id: Any, code: int, message: str, data: Any = None) -> dict[str, Any]:
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error: dict[str, Any] = {"code": code, "message": message}
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if data is not None:
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error["data"] = data
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return {"jsonrpc": "2.0", "id": message_id, "error": error}
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def _mcp_auth_enabled() -> bool:
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return bool(os.getenv("BXH_MCP_TOKEN", "").strip())
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def _is_authorized(request: Request) -> bool:
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expected = os.getenv("BXH_MCP_TOKEN", "").strip()
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if not expected:
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return True
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auth = request.headers.get("authorization", "").strip()
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api_key = request.headers.get("x-mcp-api-key", "").strip()
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bearer = auth[7:].strip() if auth.lower().startswith("bearer ") else auth
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return expected in {bearer, api_key}
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def _normalize_args(params: dict[str, Any]) -> tuple[str, dict[str, Any]]:
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name = str(params.get("name") or "").strip()
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args = params.get("arguments")
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if args is None:
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args = {}
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if not isinstance(args, dict):
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raise ValueError("arguments must be an object")
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return name, args
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def _question_for_tool(name: str, args: dict[str, Any]) -> str:
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if name == "ask_customer_service":
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return str(args.get("question") or "").strip()
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if name == "query_route_price":
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route = str(args.get("route_name") or "").strip()
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traveler = str(args.get("traveler_type") or "").strip()
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suffix = f"，{traveler}怎么收费" if traveler else ""
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return f"{route}多少钱{suffix}？".strip()
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if name == "list_travel_routes":
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keyword = str(args.get("keyword") or "").strip()
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days = args.get("duration_days")
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pieces = ["旅行车线路有哪些"]
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if keyword:
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pieces.append(f"和{keyword}相关")
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if days:
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pieces.append(f"{days}天")
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return "，".join(pieces) + "？"
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if name == "query_route_detail":
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route = str(args.get("route_name") or "").strip()
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focus = str(args.get("detail_focus") or "").strip()
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if focus:
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return f"{route}的{focus}是什么？"
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return f"{route}多少钱，可以玩几天，期间可以去哪些景区，附近可以入住什么酒店？"
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if name == "compare_routes":
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route_a = str(args.get("route_a") or "").strip()
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route_b = str(args.get("route_b") or "").strip()
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focus = str(args.get("compare_focus") or "哪个更适合客户").strip()
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return f"{route_a}和{route_b}{focus}，为什么？"
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raise KeyError(name)
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def _mcp_content_text(payload: dict[str, Any]) -> str:
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reply = str(payload.get("customer_reply") or payload.get("answer") or "").strip()
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if reply:
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return reply
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return "当前知识图谱没有返回可直接回复的话术，请补充线路、人数、天数或出行日期后再试。"
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def _mcp_structured_data(payload: dict[str, Any]) -> dict[str, Any]:
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knowledge = payload.get("knowledge") if isinstance(payload.get("knowledge"), dict) else {}
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return {
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"status": payload.get("status") or "ok",
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"service": payload.get("service") or "baixinghui_customer_service",
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"request_id": payload.get("request_id"),
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"trace_id": payload.get("trace_id"),
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"session_id": payload.get("session_id"),
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"graph_name": payload.get("graph_name"),
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"question": payload.get("question"),
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"customer_reply": payload.get("customer_reply"),
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"answer": payload.get("answer"),
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"confidence": payload.get("confidence"),
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"follow_up_questions": payload.get("follow_up_questions") or [],
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"risk_notes": payload.get("risk_notes") or [],
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"knowledge": {
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"plans": knowledge.get("plans") or [],
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"evidence": knowledge.get("evidence") or [],
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},
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"routing": payload.get("routing") or {},
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"trace": payload.get("trace") or {},
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}
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def _negotiate_protocol_version(params: dict[str, Any]) -> str:
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requested = str(params.get("protocolVersion") or "").strip()
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if requested in SUPPORTED_MCP_PROTOCOL_VERSIONS:
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return requested
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return MCP_PROTOCOL_VERSION
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async def _call_customer_service_tool(name: str, args: dict[str, Any]) -> dict[str, Any]:
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question = _question_for_tool(name, args)
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if not question:
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raise ValueError("question or route fields are required")
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body = {
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"request_id": args.get("request_id") or f"mcp-{uuid.uuid4().hex[:16]}",
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"session_id": args.get("session_id") or "",
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"channel": args.get("channel") or "mcp",
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"graph_name": args.get("graph_name") or DEFAULT_GRAPH_NAME,
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"question": question,
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"customer_context": args.get("customer_context") if isinstance(args.get("customer_context"), dict) else {},
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"limit": int(args.get("limit") or 80),
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}
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started = time.perf_counter()
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payload = await _customer_service_query_response(body)
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structured = _mcp_structured_data(payload)
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structured["tool_name"] = name
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structured["tool_latency_ms"] = max(1, round((time.perf_counter() - started) * 1000))
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return {
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"content": [{"type": "text", "text": _mcp_content_text(payload)}],
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"structuredContent": structured,
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"isError": False,
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}
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async def _handle_request(message: dict[str, Any]) -> dict[str, Any] | None:
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message_id = message.get("id")
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method = str(message.get("method") or "")
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params = message.get("params") if isinstance(message.get("params"), dict) else {}
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if not method:
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return _json_rpc_error(message_id, -32600, "Invalid Request")
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# JSON-RPC notifications have no id and do not require a response.
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if "id" not in message:
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return None
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if method == "initialize":
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return _json_rpc_result(
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message_id,
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{
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"protocolVersion": _negotiate_protocol_version(params),
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"capabilities": {"tools": {"listChanged": False}},
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"serverInfo": {
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"name": "baixinghui-customer-service-mcp",
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"version": "0.1.0",
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},
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"instructions": "使用百姓惠旅行社知识图谱工具回答线路、价格、景区、酒店和费用问题。",
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},
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)
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if method == "ping":
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return _json_rpc_result(message_id, {})
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if method == "tools/list":
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return _json_rpc_result(message_id, {"tools": _tool_definitions()})
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if method == "tools/call":
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try:
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name, args = _normalize_args(params)
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tool_names = {tool["name"] for tool in _tool_definitions()}
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if name not in tool_names:
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return _json_rpc_error(message_id, -32602, f"Unknown tool: {name}")
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result = await _call_customer_service_tool(name, args)
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return _json_rpc_result(message_id, result)
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except ValueError as exc:
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return _json_rpc_error(message_id, -32602, str(exc))
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except Exception as exc: # noqa: BLE001
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return _json_rpc_error(message_id, -32603, f"Tool execution failed: {str(exc)[:300]}")
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if method in {"resources/list", "prompts/list"}:
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key = "resources" if method == "resources/list" else "prompts"
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return _json_rpc_result(message_id, {key: []})
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return _json_rpc_error(message_id, -32601, f"Method not found: {method}")
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@router.get("/mcp")
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async def mcp_get(request: Request):
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if not _is_authorized(request):
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return JSONResponse({"detail": "Unauthorized"}, status_code=401)
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accept = request.headers.get("accept", "")
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if "text/event-stream" in accept:
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async def stream():
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yield ": baixinghui customer-service MCP endpoint is ready\n\n"
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return StreamingResponse(stream(), media_type="text/event-stream")
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return {
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"name": "baixinghui-customer-service-mcp",
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"protocolVersion": MCP_PROTOCOL_VERSION,
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"auth": "bearer" if _mcp_auth_enabled() else "disabled",
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"tools": [tool["name"] for tool in _tool_definitions()],
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}
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@router.post("/mcp")
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async def mcp_post(request: Request):
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if not _is_authorized(request):
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return JSONResponse(
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_json_rpc_error(None, -32001, "Unauthorized"),
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status_code=401,
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media_type="application/json",
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)
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try:
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payload = await request.json()
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except Exception:
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return JSONResponse(
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_json_rpc_error(None, -32700, "Parse error"),
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status_code=400,
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media_type="application/json",
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)
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if isinstance(payload, list):
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responses = []
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for message in payload:
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if not isinstance(message, dict):
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responses.append(_json_rpc_error(None, -32600, "Invalid Request"))
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continue
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response = await _handle_request(message)
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if response is not None:
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responses.append(response)
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if not responses:
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return Response(status_code=202)
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return JSONResponse(responses, media_type="application/json")
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if not isinstance(payload, dict):
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return JSONResponse(
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_json_rpc_error(None, -32600, "Invalid Request"),
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status_code=400,
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media_type="application/json",
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)
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response = await _handle_request(payload)
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if response is None:
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return Response(status_code=202)
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return JSONResponse(response, media_type="application/json")
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