""" 对话 Agent：基于访谈问题清单，动态选择问题，实时生成回应 支持异步调用和 Redis 会话存储 """ import logging from typing import List, Optional, Dict, Any from langchain_core.messages import HumanMessage, AIMessage from langchain_core.prompts import ChatPromptTemplate, MessagesPlaceholder from services.llm_service import llm_service from services.redis_service import redis_service from .prompts import ConversationStage, get_conversation_prompt, get_guided_conversation_prompt from .state_schema import MemoirStateSchema logger = logging.getLogger(__name__) class ConversationAgent: """对话 Agent（支持异步和 Redis 存储）""" def __init__(self): # 使用 LLM 服务获取 LLM 实例 self.llm = llm_service.get_llm() async def _get_history_messages(self, conversation_id: str) -> List[Any]: """从 Redis 获取对话历史并转换为 LangChain 消息格式""" history = await redis_service.get_conversation_history(conversation_id) messages = [] for msg in history: if msg["role"] == "human": messages.append(HumanMessage(content=msg["content"])) elif msg["role"] == "ai": messages.append(AIMessage(content=msg["content"])) return messages async def _save_message(self, conversation_id: str, role: str, content: str): """保存消息到 Redis""" await redis_service.add_message(conversation_id, role, content) def _format_history_string(self, messages: List[Any]) -> str: """将消息列表格式化为字符串（用于 prompt）""" history_parts = [] for msg in messages: if isinstance(msg, HumanMessage): history_parts.append(f"Human: {msg.content}") elif isinstance(msg, AIMessage): history_parts.append(f"Assistant: {msg.content}") return "\n\n".join(history_parts) async def generate_response( self, conversation_id: str, user_message: str, current_stage: Optional[ConversationStage] = None, covered_topics: Optional[List[str]] = None ) -> str: """ 异步生成 Agent 回应 Args: conversation_id: 对话 ID user_message: 用户消息 current_stage: 当前对话阶段 covered_topics: 已聊过的话题列表 Returns: Agent 回应文本 """ if current_stage is None: current_stage = ConversationStage.CHILDHOOD if covered_topics is None: covered_topics = [] # 如果没有配置 LLM，返回默认回应 if not self.llm: return "抱歉，LLM 服务未配置。请设置 DEEPSEEK_API_KEY 或 LLM_API_KEY 环境变量。" try: # 获取系统提示词 system_prompt = get_conversation_prompt(current_stage, covered_topics, user_message) # 从 Redis 获取对话历史 history_messages = await self._get_history_messages(conversation_id) history_string = self._format_history_string(history_messages) # 构建完整 prompt full_prompt = f"{system_prompt}\n\n{history_string}\n\nHuman: {user_message}\n\nAssistant:" # 异步调用 LLM response = await self.llm.ainvoke(full_prompt) response_text = response.content if hasattr(response, 'content') else str(response) # 保存对话到 Redis await self._save_message(conversation_id, "human", user_message) await self._save_message(conversation_id, "ai", response_text) return response_text except Exception as e: logger.error(f"生成回应失败: {e}") return f"抱歉，生成回应时出现错误: {str(e)}" async def generate_response_with_state( self, conversation_id: str, user_message: str, memoir_state: MemoirStateSchema ) -> List[str]: """ 基于共享状态异步生成引导式回复 Args: conversation_id: 对话 ID user_message: 用户消息 memoir_state: 共享状态 Returns: Agent 回应文本列表（支持多条消息） """ if not self.llm: return ["抱歉，LLM 服务未配置。请设置 DEEPSEEK_API_KEY 或 LLM_API_KEY 环境变量。"] try: empty_slots = memoir_state.empty_slots_for_current_stage() filled_slots = { key: value.snippet for key, value in memoir_state.slots.get(memoir_state.current_stage, {}).items() if value.snippet } system_prompt = get_guided_conversation_prompt( current_stage=memoir_state.current_stage, empty_slots=empty_slots, filled_slots=filled_slots, user_message=user_message, ) # 从 Redis 获取对话历史 history_messages = await self._get_history_messages(conversation_id) history_string = self._format_history_string(history_messages) # 构建完整 prompt full_prompt = f"{system_prompt}\n\n{history_string}\n\nHuman: {user_message}\n\nAssistant:" # 异步调用 LLM response = await self.llm.ainvoke(full_prompt) response_text = response.content if hasattr(response, 'content') else str(response) # 保存对话到 Redis await self._save_message(conversation_id, "human", user_message) await self._save_message(conversation_id, "ai", response_text) # 支持多条消息，用 [SPLIT] 分隔 messages = [msg.strip() for msg in response_text.split("[SPLIT]") if msg.strip()] # 最多返回 3 条 return messages[:3] if messages else [response_text] except Exception as e: logger.error(f"生成回应失败: {e}") return [f"抱歉，生成回应时出现错误: {str(e)}"] def detect_stage(self, conversation_id: str, user_message: str) -> ConversationStage: """ 检测对话阶段 Args: conversation_id: 对话 ID user_message: 用户消息 Returns: 检测到的对话阶段 """ # 简单的关键词检测（实际应该使用更智能的方法） message_lower = user_message.lower() if any(word in message_lower for word in ["童年", "小时候", "出生", "家庭背景"]): return ConversationStage.CHILDHOOD elif any(word in message_lower for word in ["上学", "学校", "老师", "同学", "教育"]): return ConversationStage.EDUCATION elif any(word in message_lower for word in ["工作", "职业", "事业", "公司", "同事"]): return ConversationStage.CAREER elif any(word in message_lower for word in ["伴侣", "孩子", "家庭", "家人", "结婚"]): return ConversationStage.FAMILY elif any(word in message_lower for word in ["信念", "价值观", "座右铭", "坚持", "原则"]): return ConversationStage.BELIEFS elif any(word in message_lower for word in ["总结", "回顾", "感激", "希望", "未来"]): return ConversationStage.SUMMARY else: # 默认返回当前阶段或童年阶段 return ConversationStage.CHILDHOOD async def clear_memory(self, conversation_id: str): """清除对话记忆（从 Redis）""" await redis_service.clear_conversation_history(conversation_id)