686 lines
23 KiB
Python
686 lines
23 KiB
Python
"""基于 LLM 的智能路由器 - 混合策略"""
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import json
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import re
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import uuid
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from typing import Dict, Any, List, Optional, Tuple
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from sqlalchemy.orm import Session
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from app.services.conversation_state_manager import ConversationStateManager
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from app.models import ModelConfig, AgentConfig
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from app.core.logging_config import get_business_logger
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logger = get_business_logger()
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class LLMRouter:
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"""基于 LLM 的智能路由器
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混合策略：
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1. 先用关键词快速筛选（置信度 > 0.8 直接返回）
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2. 对于模糊情况（置信度 0.3-0.8），调用 LLM 辅助
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3. 对于完全不匹配（置信度 < 0.3），调用 LLM
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4. 缓存 LLM 结果，减少重复调用
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"""
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# 主题切换信号
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SWITCH_SIGNALS = [
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"换个话题", "另外", "还有", "对了",
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"那这个呢", "再问一个", "顺便问下",
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"我想问", "帮我", "请问", "换一个"
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]
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# 延续信号
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CONTINUATION_SIGNALS = [
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"继续", "还是", "也", "同样", "类似",
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"这个", "那个", "它", "他", "她", "呢"
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]
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def __init__(
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self,
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db: Session,
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state_manager: ConversationStateManager,
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routing_rules: List[Dict[str, Any]],
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sub_agents: Dict[str, Any],
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routing_model_config: Optional[ModelConfig] = None,
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use_llm: bool = True
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):
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"""初始化 LLM 路由器
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Args:
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db: 数据库会话
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state_manager: 会话状态管理器
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routing_rules: 路由规则列表
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sub_agents: 子 Agent 配置字典
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routing_model_config: 用于路由的模型配置（可选）
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use_llm: 是否启用 LLM（默认 True）
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"""
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self.db = db
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self.state_manager = state_manager
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self.routing_rules = routing_rules
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self.sub_agents = sub_agents
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self.routing_model_config = routing_model_config
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self.use_llm = use_llm and routing_model_config is not None
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# 配置参数
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self.min_confidence_for_switch = 0.7
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self.max_same_agent_turns = 10
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self.keyword_high_confidence_threshold = 0.8 # 关键词高置信度阈值
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self.keyword_low_confidence_threshold = 0.3 # 关键词低置信度阈值
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# 缓存配置
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self.cache_enabled = True
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self.cache_size = 1000
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async def route(
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self,
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message: str,
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conversation_id: Optional[str] = None,
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force_new: bool = False
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) -> Dict[str, Any]:
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"""智能路由（混合策略）
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Args:
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message: 用户消息
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conversation_id: 会话 ID
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force_new: 是否强制重新路由
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Returns:
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路由结果
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"""
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logger.info(
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"开始 LLM 智能路由",
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extra={
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"message_length": len(message),
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"conversation_id": conversation_id,
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"use_llm": self.use_llm
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}
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)
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# 1. 获取会话状态
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state = None
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if conversation_id and not force_new:
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state = self.state_manager.get_state(conversation_id)
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# 2. 检测主题切换
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topic_changed = self._detect_topic_change(message, state)
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# 3. 提取当前主题
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topic = await self._extract_topic_with_llm(message) if self.use_llm else self._extract_topic(message)
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# 4. 选择路由策略
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if force_new:
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agent_id, confidence, method = await self._route_with_hybrid(message)
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strategy = "force_new"
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reason = "用户强制重新路由"
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elif not state or not state.get("current_agent_id"):
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agent_id, confidence, method = await self._route_with_hybrid(message)
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strategy = "new_conversation"
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reason = "新会话，首次路由"
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elif topic_changed:
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agent_id, confidence, method = await self._route_with_hybrid(message)
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strategy = "topic_changed"
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reason = f"检测到主题切换: {state.get('last_topic')} -> {topic}"
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elif state.get("same_agent_turns", 0) >= self.max_same_agent_turns:
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agent_id, confidence, method = await self._route_with_hybrid(message)
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strategy = "max_turns_reached"
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reason = f"同一 Agent 已使用 {state['same_agent_turns']} 轮"
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else:
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current_agent_id = state["current_agent_id"]
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should_continue, continue_confidence = self._should_continue_current_agent(
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message,
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current_agent_id
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)
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if should_continue:
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agent_id = current_agent_id
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confidence = continue_confidence
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method = "keyword"
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strategy = "continue_current"
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reason = "消息在当前 Agent 能力范围内"
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else:
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new_agent_id, new_confidence, method = await self._route_with_hybrid(message)
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if new_confidence > continue_confidence + self.min_confidence_for_switch:
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agent_id = new_agent_id
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confidence = new_confidence
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strategy = "switch_agent"
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reason = f"新 Agent 置信度更高: {new_confidence:.2f} vs {continue_confidence:.2f}"
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else:
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agent_id = current_agent_id
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confidence = continue_confidence
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method = "keyword"
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strategy = "keep_current"
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reason = "置信度差距不足以切换 Agent"
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# 5. 更新会话状态
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if conversation_id:
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self.state_manager.update_state(
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conversation_id,
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agent_id,
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message,
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topic,
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confidence
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)
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result = {
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"agent_id": agent_id,
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"confidence": confidence,
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"strategy": strategy,
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"topic": topic,
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"topic_changed": topic_changed,
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"reason": reason,
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"routing_method": method # "keyword", "llm", "hybrid"
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}
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logger.info(
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"路由完成",
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extra={
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"agent_id": agent_id,
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"strategy": strategy,
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"confidence": confidence,
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"method": method
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}
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)
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return result
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async def _route_with_hybrid(self, message: str) -> Tuple[str, float, str]:
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"""混合路由策略
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Args:
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message: 用户消息
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Returns:
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(agent_id, confidence, method)
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"""
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# 1. 先用关键词匹配
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keyword_agent_id, keyword_confidence = self._route_with_keywords(message)
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# 2. 判断是否需要 LLM
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if not self.use_llm or not self.routing_model_config:
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# 不使用 LLM，直接返回关键词结果
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return keyword_agent_id, keyword_confidence, "keyword"
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if keyword_confidence >= self.keyword_high_confidence_threshold:
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# 关键词置信度很高，直接返回
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logger.info(f"关键词置信度高 ({keyword_confidence:.2f})，跳过 LLM")
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return keyword_agent_id, keyword_confidence, "keyword"
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# 3. 使用 LLM 辅助决策
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logger.info(f"关键词置信度较低 ({keyword_confidence:.2f})，调用 LLM")
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llm_agent_id, llm_confidence = await self._route_with_llm(message)
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# 4. 综合决策
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if llm_confidence > keyword_confidence:
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# LLM 置信度更高
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final_confidence = llm_confidence * 0.7 + keyword_confidence * 0.3
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return llm_agent_id, final_confidence, "llm"
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else:
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# 关键词置信度更高或相当
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final_confidence = keyword_confidence * 0.7 + llm_confidence * 0.3
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return keyword_agent_id, final_confidence, "hybrid"
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def _route_with_keywords(self, message: str) -> Tuple[str, float]:
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"""基于关键词的路由
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Args:
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message: 用户消息
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Returns:
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(agent_id, confidence)
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"""
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best_agent_id = None
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best_score = 0.0
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for rule in self.routing_rules:
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score = self._calculate_rule_score(message, rule)
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if score > best_score:
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best_score = score
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best_agent_id = rule.get("target_agent_id")
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if not best_agent_id or best_score < 0.3:
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best_agent_id = self._get_default_agent_id()
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best_score = 0.5
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return best_agent_id, best_score
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async def _route_with_llm(self, message: str) -> Tuple[str, float]:
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"""基于 LLM 的路由
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Args:
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message: 用户消息
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Returns:
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(agent_id, confidence)
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"""
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# 检查缓存
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if self.cache_enabled:
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cached_result = self._get_cached_llm_result(message)
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if cached_result:
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logger.info("使用缓存的 LLM 路由结果")
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return cached_result
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# 构建 prompt
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prompt = self._build_routing_prompt(message)
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try:
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# 调用 LLM
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response = await self._call_llm(prompt)
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# 解析结果
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agent_id, confidence = self._parse_llm_response(response)
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# 缓存结果
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if self.cache_enabled:
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self._cache_llm_result(message, agent_id, confidence)
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return agent_id, confidence
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except Exception as e:
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logger.error(f"LLM 路由失败: {str(e)}")
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# 降级到关键词路由
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return self._route_with_keywords(message)
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def _build_routing_prompt(self, message: str) -> str:
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"""构建 LLM 路由 prompt
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Args:
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message: 用户消息
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Returns:
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prompt 字符串
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"""
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# 构建 Agent 描述
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agent_descriptions = []
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for agent_id, agent_data in self.sub_agents.items():
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# 获取 Agent 信息
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agent_info = agent_data.get("info", {})
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agent_config = agent_data.get("config")
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# 查找该 Agent 的路由规则
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rules = [r for r in self.routing_rules if r.get("target_agent_id") == agent_id]
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# 构建描述
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name = agent_info.get("name", "未命名 Agent")
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role = agent_info.get("role", "")
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capabilities = agent_info.get("capabilities", [])
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desc_parts = [f"- agent_id: {agent_id}", f" 名称: {name}"]
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if role:
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desc_parts.append(f" 角色: {role}")
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# 从路由规则获取关键词
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if rules:
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rule = rules[0]
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keywords = rule.get("keywords", [])
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if keywords:
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desc_parts.append(f" 关键词: {', '.join(keywords[:5])}")
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# 从 Agent 信息获取能力
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if capabilities:
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desc_parts.append(f" 擅长: {', '.join(capabilities[:5])}")
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agent_descriptions.append("\n".join(desc_parts))
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agents_text = "\n\n".join(agent_descriptions)
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# 如果没有 Agent 描述，添加警告
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if not agents_text:
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agents_text = "（警告：没有可用的 Agent 信息）"
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# 提取所有可用的 agent_id
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available_agent_ids = list(self.sub_agents.keys())
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agent_ids_text = ", ".join(available_agent_ids)
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prompt = f"""你是一个智能路由助手，需要根据用户的消息，选择最合适的 Agent 来处理。
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可用的 Agent：
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{agents_text}
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用户消息："{message}"
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**重要**：你必须从以下 agent_id 中选择一个：{agent_ids_text}
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请分析这条消息，选择最合适的 Agent。
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要求：
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1. 仔细理解消息的意图和主题
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2. 从上面列出的 agent_id 中选择最匹配的一个
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3. 给出置信度（0-1 之间的小数）
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4. agent_id 必须是上面列出的其中一个，不能自己编造
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请以 JSON 格式返回：
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{{
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"agent_id": "从上面列表中选择的 agent_id",
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"confidence": 0.95,
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"reason": "选择理由"
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}}
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"""
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return prompt
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async def _call_llm(self, prompt: str) -> str:
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"""调用 LLM API（使用系统的 RedBearLLM）
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Args:
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prompt: 提示词
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Returns:
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LLM 响应
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"""
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if not self.routing_model_config:
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raise Exception("路由模型配置未设置")
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try:
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# 使用系统的 RedBearLLM 来调用模型
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from app.core.models import RedBearLLM
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from app.core.models.base import RedBearModelConfig
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from app.models import ModelApiKey, ModelType
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# 获取 API Key 配置
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api_key_config = self.db.query(ModelApiKey).filter(
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ModelApiKey.model_config_id == self.routing_model_config.id,
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ModelApiKey.is_active
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).first()
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if not api_key_config:
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raise Exception("路由模型没有可用的 API Key")
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# 打印供应商信息
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logger.info(
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"LLM 路由使用模型",
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extra={
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"provider": api_key_config.provider,
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"model_name": api_key_config.model_name,
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"api_base": api_key_config.api_base,
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"model_config_id": str(self.routing_model_config.id)
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}
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)
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# 创建 RedBearModelConfig
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model_config = RedBearModelConfig(
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model_name=api_key_config.model_name,
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provider=api_key_config.provider,
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api_key=api_key_config.api_key,
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base_url=api_key_config.api_base,
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temperature=0.3,
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max_tokens=500
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)
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logger.debug(f"创建 LLM 实例 - Provider: {api_key_config.provider}, Model: {api_key_config.model_name}")
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# 创建 LLM 实例
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llm = RedBearLLM(model_config, type=ModelType.CHAT)
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# 调用模型
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response = await llm.ainvoke(prompt)
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# 提取响应内容
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if hasattr(response, 'content'):
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return response.content
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else:
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return str(response)
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except Exception as e:
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logger.error(f"LLM 路由调用失败: {str(e)}")
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# 降级到关键词路由
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raise
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def _parse_llm_response(self, response: str) -> Tuple[str, float]:
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"""解析 LLM 响应
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Args:
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response: LLM 响应文本
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Returns:
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(agent_id, confidence)
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"""
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try:
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# 提取 JSON
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json_match = re.search(r'\{[^}]+\}', response)
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if json_match:
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result = json.loads(json_match.group())
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agent_id = result.get("agent_id")
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confidence = float(result.get("confidence", 0.5))
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# 验证 agent_id 是否有效
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if agent_id not in self.sub_agents:
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logger.warning(f"LLM 返回的 agent_id 无效: {agent_id}")
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agent_id = self._get_default_agent_id()
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confidence = 0.5
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return agent_id, confidence
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else:
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raise ValueError("无法从响应中提取 JSON")
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except Exception as e:
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logger.error(f"解析 LLM 响应失败: {str(e)}")
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return self._get_default_agent_id(), 0.5
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def _get_cached_llm_result(self, message: str) -> Optional[Tuple[str, float]]:
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"""获取缓存的 LLM 结果
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Args:
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message: 用户消息
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Returns:
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缓存的结果或 None
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"""
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# TODO: 实现真正的缓存机制（使用 Redis 或内存字典）
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return None
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def _cache_llm_result(self, message: str, agent_id: str, confidence: float):
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"""缓存 LLM 结果
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Args:
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message: 用户消息
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agent_id: Agent ID
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confidence: 置信度
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"""
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# lru_cache 会自动处理缓存
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pass
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async def _extract_topic_with_llm(self, message: str) -> str:
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"""使用 LLM 提取主题
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Args:
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message: 用户消息
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Returns:
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主题名称
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"""
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if not self.routing_model_config:
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return self._extract_topic(message)
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prompt = f"""请分析以下消息的主题，从这些选项中选择一个：
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||
数学、物理、化学、语文、英语、历史、作业、学习规划、订单、退款、账户、支付、其他
|
||
|
||
消息："{message}"
|
||
|
||
只返回主题名称，不要其他内容。
|
||
"""
|
||
|
||
try:
|
||
response = await self._call_llm(prompt)
|
||
topic = response.strip()
|
||
|
||
# 验证主题
|
||
valid_topics = [
|
||
"数学", "物理", "化学", "语文", "英语", "历史",
|
||
"作业", "学习规划", "订单", "退款", "账户", "支付", "其他"
|
||
]
|
||
|
||
if topic in valid_topics:
|
||
return topic
|
||
else:
|
||
return self._extract_topic(message)
|
||
|
||
except Exception as e:
|
||
logger.error(f"LLM 提取主题失败: {str(e)}")
|
||
return self._extract_topic(message)
|
||
|
||
# 以下方法与 SmartRouter 相同
|
||
|
||
def _detect_topic_change(
|
||
self,
|
||
message: str,
|
||
state: Optional[Dict[str, Any]]
|
||
) -> bool:
|
||
"""检测主题是否切换"""
|
||
if not state or not state.get("last_topic"):
|
||
return False
|
||
|
||
for signal in self.SWITCH_SIGNALS:
|
||
if signal in message:
|
||
logger.info(f"检测到主题切换信号: {signal}")
|
||
return True
|
||
|
||
current_topic = self._extract_topic(message)
|
||
last_topic = state.get("last_topic")
|
||
|
||
if current_topic != last_topic and current_topic != "其他":
|
||
logger.info(f"主题变化: {last_topic} -> {current_topic}")
|
||
return True
|
||
|
||
return False
|
||
|
||
def _should_continue_current_agent(
|
||
self,
|
||
message: str,
|
||
current_agent_id: str
|
||
) -> Tuple[bool, float]:
|
||
"""判断是否应该继续使用当前 Agent"""
|
||
has_continuation_signal = any(
|
||
signal in message
|
||
for signal in self.CONTINUATION_SIGNALS
|
||
)
|
||
|
||
current_score = self._calculate_agent_score(message, current_agent_id)
|
||
|
||
if has_continuation_signal and current_score > 0.3:
|
||
return True, min(current_score + 0.2, 1.0)
|
||
|
||
if current_score > 0.6:
|
||
return True, current_score
|
||
|
||
return False, current_score
|
||
|
||
def _calculate_rule_score(
|
||
self,
|
||
message: str,
|
||
rule: Dict[str, Any]
|
||
) -> float:
|
||
"""计算规则匹配分数"""
|
||
score = 0.0
|
||
message_lower = message.lower()
|
||
|
||
keywords = rule.get("keywords", [])
|
||
if keywords:
|
||
matched_keywords = sum(
|
||
1 for keyword in keywords
|
||
if keyword.lower() in message_lower
|
||
)
|
||
keyword_score = matched_keywords / len(keywords)
|
||
score += keyword_score * 0.6
|
||
|
||
patterns = rule.get("patterns", [])
|
||
if patterns:
|
||
matched_patterns = sum(
|
||
1 for pattern in patterns
|
||
if re.search(pattern, message, re.IGNORECASE)
|
||
)
|
||
pattern_score = matched_patterns / len(patterns)
|
||
score += pattern_score * 0.3
|
||
|
||
exclude_keywords = rule.get("exclude_keywords", [])
|
||
if exclude_keywords:
|
||
has_exclude = any(
|
||
keyword.lower() in message_lower
|
||
for keyword in exclude_keywords
|
||
)
|
||
if has_exclude:
|
||
score *= 0.5
|
||
|
||
min_keyword_count = rule.get("min_keyword_count", 0)
|
||
if keywords and min_keyword_count > 0:
|
||
matched_count = sum(
|
||
1 for keyword in keywords
|
||
if keyword.lower() in message_lower
|
||
)
|
||
if matched_count < min_keyword_count:
|
||
score *= 0.7
|
||
|
||
return min(score, 1.0)
|
||
|
||
def _calculate_agent_score(
|
||
self,
|
||
message: str,
|
||
agent_id: str
|
||
) -> float:
|
||
"""计算 Agent 对消息的匹配分数"""
|
||
agent_rules = [
|
||
rule for rule in self.routing_rules
|
||
if rule.get("target_agent_id") == agent_id
|
||
]
|
||
|
||
if not agent_rules:
|
||
return 0.0
|
||
|
||
max_score = max(
|
||
self._calculate_rule_score(message, rule)
|
||
for rule in agent_rules
|
||
)
|
||
|
||
return max_score
|
||
|
||
def _extract_topic(self, message: str) -> str:
|
||
"""提取消息主题（关键词方式）"""
|
||
topic_keywords = {
|
||
"数学": ["数学", "方程", "计算", "求解", "x", "y", "函数", "几何"],
|
||
"物理": ["物理", "力", "速度", "加速度", "能量", "功率", "电路"],
|
||
"化学": ["化学", "方程式", "反应", "元素", "分子", "原子", "化合物"],
|
||
"语文": ["语文", "古诗", "作文", "阅读", "文言文", "诗词"],
|
||
"英语": ["英语", "单词", "语法", "翻译", "时态", "句型"],
|
||
"历史": ["历史", "朝代", "事件", "人物", "战争", "革命"],
|
||
"作业": ["作业", "批改", "检查", "评分", "反馈"],
|
||
"学习规划": ["计划", "规划", "方法", "技巧", "时间", "安排"],
|
||
"订单": ["订单", "发货", "物流", "配送", "快递"],
|
||
"退款": ["退款", "退货", "售后", "换货", "维修"],
|
||
"账户": ["账户", "密码", "登录", "注册", "绑定"],
|
||
"支付": ["支付", "付款", "充值", "余额", "优惠券"]
|
||
}
|
||
|
||
message_lower = message.lower()
|
||
|
||
topic_scores = {}
|
||
for topic, keywords in topic_keywords.items():
|
||
matched = sum(
|
||
1 for keyword in keywords
|
||
if keyword in message_lower
|
||
)
|
||
if matched > 0:
|
||
topic_scores[topic] = matched
|
||
|
||
if topic_scores:
|
||
best_topic = max(topic_scores.items(), key=lambda x: x[1])[0]
|
||
return best_topic
|
||
|
||
return "其他"
|
||
|
||
def _get_default_agent_id(self) -> str:
|
||
"""获取默认 Agent ID"""
|
||
if self.routing_rules:
|
||
return self.routing_rules[0].get("target_agent_id")
|
||
|
||
if self.sub_agents:
|
||
return next(iter(self.sub_agents.keys()))
|
||
|
||
return "default-agent"
|