[add] multi agent handoff
This commit is contained in:
Mark
686
api/app/services/collaborative_orchestrator.py
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686
api/app/services/collaborative_orchestrator.py
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@@ -0,0 +1,686 @@
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"""协作编排器 - 支持 Agent 之间的动态切换和协作
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基于 LangChain handoffs 模式，实现：
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1. Agent 之间的动态切换（tool-based handoffs）
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2. 会话上下文的保持
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3. 智能路由决策
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4. 协作历史追踪
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"""
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import json
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import uuid
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import time
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from typing import Dict, Any, Optional, List, AsyncGenerator
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from sqlalchemy.orm import Session
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from app.services.agent_handoff import (
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get_handoff_manager,
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HandoffManager,
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AgentHandoffTool
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)
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from app.services.dynamic_handoff_tools import DynamicHandoffToolCreator
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from app.core.logging_config import get_business_logger
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from app.core.exceptions import BusinessException
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from app.core.error_codes import BizCode
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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 ModelType
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logger = get_business_logger()
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class CollaborativeOrchestrator:
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"""协作编排器 - 管理多 Agent 协作和切换"""
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def __init__(
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self,
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db: Session,
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config: Any,
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handoff_manager: Optional[HandoffManager] = None
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):
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"""初始化协作编排器
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Args:
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db: 数据库会话
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config: 多 Agent 配置
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handoff_manager: Handoff 管理器（可选）
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"""
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self.db = db
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self.config = config
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self.handoff_manager = handoff_manager or get_handoff_manager()
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# 解析配置
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self.sub_agents = self._parse_sub_agents(config.sub_agents)
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self.execution_config = config.execution_config or {}
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# 协作模式
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self.enable_handoffs = self.execution_config.get("enable_handoffs", True)
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self.max_handoffs = self.execution_config.get("max_handoffs", 5)
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logger.info(
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"协作编排器初始化",
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extra={
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"sub_agent_count": len(self.sub_agents),
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"enable_handoffs": self.enable_handoffs,
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"max_handoffs": self.max_handoffs
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}
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)
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def _parse_sub_agents(self, sub_agents_data: List[Dict]) -> Dict[str, Any]:
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"""解析子 Agent 配置
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Args:
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sub_agents_data: 子 Agent 配置列表
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Returns:
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Agent ID 到配置的映射
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"""
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agents = {}
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for agent_data in sub_agents_data:
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agent_id = agent_data.get("agent_id")
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if agent_id:
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agents[str(agent_id)] = {
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"info": agent_data,
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"config": None # 稍后加载
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}
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return agents
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async def execute_with_handoffs(
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self,
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message: str,
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conversation_id: Optional[str] = None,
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user_id: Optional[str] = None,
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variables: Optional[Dict[str, Any]] = None,
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initial_agent_id: Optional[str] = None
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) -> Dict[str, Any]:
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"""执行支持 handoffs 的多 Agent 协作
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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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user_id: 用户 ID
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variables: 变量参数
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initial_agent_id: 初始 Agent ID（可选）
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Returns:
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执行结果
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"""
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if not conversation_id:
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conversation_id = str(uuid.uuid4())
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# 1. 确定初始 Agent
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if not initial_agent_id:
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initial_agent_id = await self._select_initial_agent(message, conversation_id)
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# 2. 创建或获取 handoff 状态
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state = self.handoff_manager.get_state(conversation_id)
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if not state:
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state = self.handoff_manager.create_state(conversation_id, initial_agent_id)
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current_agent_id = state.current_agent_id
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handoff_count = 0
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conversation_history = []
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# 3. 执行循环（支持多次 handoff）
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while handoff_count < self.max_handoffs:
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logger.info(
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f"执行 Agent: {current_agent_id}",
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extra={
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"conversation_id": conversation_id,
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"handoff_count": handoff_count,
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"message_length": len(message)
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}
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)
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# 3.1 生成当前 Agent 的 handoff 工具
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handoff_tools = self.handoff_manager.generate_handoff_tools(
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current_agent_id,
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self.sub_agents
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)
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# 3.2 执行当前 Agent
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result = await self._execute_agent(
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agent_id=current_agent_id,
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message=message,
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conversation_id=conversation_id,
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user_id=user_id,
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variables=variables,
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handoff_tools=handoff_tools,
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conversation_history=conversation_history
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)
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# 3.3 检查是否有 handoff 请求
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handoff_request = result.get("handoff_request")
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if not handoff_request:
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# 没有 handoff，返回结果
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return {
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"message": result.get("message", ""),
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"conversation_id": conversation_id,
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"final_agent_id": current_agent_id,
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"handoff_count": handoff_count,
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"handoff_history": [
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{
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"from_agent": h.from_agent_id,
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"to_agent": h.to_agent_id,
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"reason": h.reason
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}
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for h in state.handoff_history
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],
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"elapsed_time": result.get("elapsed_time", 0),
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"usage": result.get("usage")
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}
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# 3.4 执行 handoff
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target_agent_id = handoff_request.get("target_agent_id")
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reason = handoff_request.get("reason", "Agent 请求切换")
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context_summary = handoff_request.get("context_summary")
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if target_agent_id not in self.sub_agents:
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logger.warning(f"目标 Agent 不存在: {target_agent_id}")
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# 返回当前结果
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return {
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"message": result.get("message", ""),
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"conversation_id": conversation_id,
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"final_agent_id": current_agent_id,
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"handoff_count": handoff_count,
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"error": f"目标 Agent 不存在: {target_agent_id}",
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"elapsed_time": result.get("elapsed_time", 0)
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}
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# 执行 handoff
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state = self.handoff_manager.execute_handoff(
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conversation_id=conversation_id,
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from_agent_id=current_agent_id,
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to_agent_id=target_agent_id,
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reason=reason,
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user_message=message,
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context_summary=context_summary
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)
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# 更新当前 Agent
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current_agent_id = target_agent_id
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handoff_count += 1
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# 添加到会话历史
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conversation_history.append({
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"agent_id": state.handoff_history[-1].from_agent_id,
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"message": result.get("message", ""),
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"handoff_to": target_agent_id,
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"reason": reason
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})
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# 如果 Agent 返回了最终答案，结束循环
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if result.get("is_final_answer"):
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return {
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"message": result.get("message", ""),
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"conversation_id": conversation_id,
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"final_agent_id": current_agent_id,
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"handoff_count": handoff_count,
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"handoff_history": [
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{
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"from_agent": h.from_agent_id,
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"to_agent": h.to_agent_id,
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"reason": h.reason
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}
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for h in state.handoff_history
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],
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"elapsed_time": result.get("elapsed_time", 0),
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"usage": result.get("usage")
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}
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# 达到最大 handoff 次数
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logger.warning(
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f"达到最大 handoff 次数: {self.max_handoffs}",
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extra={"conversation_id": conversation_id}
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)
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return {
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"message": "已达到最大协作次数限制，请重新提问。",
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"conversation_id": conversation_id,
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"final_agent_id": current_agent_id,
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"handoff_count": handoff_count,
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"error": "达到最大 handoff 次数",
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"elapsed_time": 0
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}
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async def _select_initial_agent(
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self,
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message: str,
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conversation_id: str
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) -> str:
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"""选择初始 Agent
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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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Returns:
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Agent ID
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"""
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# 检查是否有历史状态
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state = self.handoff_manager.get_state(conversation_id)
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if state:
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# 继续使用当前 Agent
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return state.current_agent_id
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# 简单的关键词匹配
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message_lower = message.lower()
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for agent_id, agent_data in self.sub_agents.items():
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agent_info = agent_data.get("info", {})
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capabilities = agent_info.get("capabilities", [])
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role = agent_info.get("role", "")
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# 检查关键词
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keywords = capabilities + ([role] if role else [])
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for keyword in keywords:
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if keyword.lower() in message_lower:
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logger.info(
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f"根据关键词选择初始 Agent: {agent_id}",
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extra={"keyword": keyword}
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)
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return agent_id
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# 默认使用第一个 Agent
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default_agent_id = next(iter(self.sub_agents.keys()))
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logger.info(f"使用默认初始 Agent: {default_agent_id}")
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return default_agent_id
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async def _execute_agent(
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self,
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agent_id: str,
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message: str,
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conversation_id: str,
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user_id: Optional[str],
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variables: Optional[Dict[str, Any]],
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handoff_tools: List[AgentHandoffTool],
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conversation_history: List[Dict[str, Any]]
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) -> Dict[str, Any]:
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"""执行单个 Agent
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Args:
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agent_id: Agent ID
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message: 用户消息
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conversation_id: 会话 ID
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user_id: 用户 ID
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variables: 变量参数
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handoff_tools: Handoff 工具列表
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conversation_history: 会话历史
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Returns:
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执行结果
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"""
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start_time = time.time()
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try:
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# 获取 Agent 配置
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agent_data = self.sub_agents.get(agent_id)
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if not agent_data:
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raise BusinessException(
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f"Agent 不存在: {agent_id}",
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BizCode.RESOURCE_NOT_FOUND
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)
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# 加载 Agent 的完整配置
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agent_config = await self._load_agent_config(agent_id, agent_data)
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# 构建增强的 prompt（包含 handoff 上下文）
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enhanced_message = self._build_enhanced_message(
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message,
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conversation_id,
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agent_id,
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conversation_history
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)
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# 创建动态工具创建器
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tool_creator = DynamicHandoffToolCreator(agent_id, self.sub_agents)
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# 获取动态创建的工具
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dynamic_tools = tool_creator.get_tools_for_llm()
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logger.info(
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f"为 Agent {agent_id} 创建了 {len(dynamic_tools)} 个 handoff 工具",
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extra={"tool_names": tool_creator.get_tool_names()}
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)
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# 调用 Agent 的 LLM（注入动态工具）
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response = await self._call_agent_llm(
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agent_config=agent_config,
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message=enhanced_message,
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tools=dynamic_tools,
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conversation_history=conversation_history
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)
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# 构建结果
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result = {
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"message": response.get("content", ""),
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"elapsed_time": time.time() - start_time,
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"usage": response.get("usage", {"total_tokens": 0}),
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"is_final_answer": True
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}
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# 检查是否有工具调用（handoff）
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tool_calls = response.get("tool_calls", [])
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if tool_calls:
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for tool_call in tool_calls:
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tool_name = tool_call.get("name")
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tool_args = tool_call.get("arguments", {})
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# 检查是否是 handoff 工具
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if tool_name in tool_creator.get_tool_names():
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# 处理 handoff
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handoff_request = tool_creator.handle_tool_call(tool_name, tool_args)
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if handoff_request:
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result["handoff_request"] = handoff_request
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result["is_final_answer"] = False
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logger.info(
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f"检测到 handoff 请求: {agent_id} → {handoff_request['target_agent_id']}",
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extra={"reason": handoff_request.get("reason")}
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)
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break
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return result
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except Exception as e:
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logger.error(f"Agent 执行失败: {str(e)}", exc_info=True)
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return {
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"message": f"Agent 执行出错: {str(e)}",
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"elapsed_time": time.time() - start_time,
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"error": str(e),
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"is_final_answer": True
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}
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async def _load_agent_config(self, agent_id: str, agent_data: Dict[str, Any]) -> Dict[str, Any]:
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"""加载 Agent 的完整配置
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Args:
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agent_id: Agent ID
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agent_data: Agent 数据
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Returns:
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Agent 配置
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"""
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from app.models import AppRelease
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from app.services.model_service import ModelApiKeyService
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# 从数据库加载 Agent Release
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try:
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agent_uuid = uuid.UUID(agent_id)
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release = self.db.get(AppRelease, agent_uuid)
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if not release:
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raise BusinessException(
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f"Agent Release 不存在: {agent_id}",
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BizCode.RESOURCE_NOT_FOUND
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)
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# 获取配置
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config_data = release.config or {}
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# 获取模型配置
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model_config_id = release.default_model_config_id
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if not model_config_id:
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raise BusinessException(
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f"Agent 未配置模型: {agent_id}",
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BizCode.AGENT_CONFIG_MISSING
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)
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# 获取 API Key
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api_key_config = ModelApiKeyService.get_a_api_key(self.db, model_config_id)
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if not api_key_config:
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raise BusinessException(
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f"Agent 模型没有可用的 API Key: {agent_id}",
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BizCode.API_KEY_NOT_FOUND
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)
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return {
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"agent_id": agent_id,
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"name": release.name,
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"system_prompt": config_data.get("system_prompt", ""),
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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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"api_base": api_key_config.api_base,
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"model_parameters": config_data.get("model_parameters", {})
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}
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except ValueError:
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raise BusinessException(
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f"无效的 Agent ID: {agent_id}",
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BizCode.INVALID_PARAMETER
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)
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async def _call_agent_llm(
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self,
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agent_config: Dict[str, Any],
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message: str,
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tools: List[Dict[str, Any]],
|
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conversation_history: List[Dict[str, Any]]
|
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) -> Dict[str, Any]:
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"""调用 Agent 的 LLM
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Args:
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agent_config: Agent 配置
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message: 消息
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tools: 工具列表（包含 handoff 工具）
|
||||
conversation_history: 会话历史
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Returns:
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LLM 响应
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"""
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try:
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# 构建系统提示（包含工具说明）
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system_prompt = self._build_system_prompt_with_tools(
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agent_config.get("system_prompt", ""),
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tools
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)
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# 构建消息列表
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messages = [{"role": "system", "content": system_prompt}]
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# 添加历史消息（最近 5 轮）
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if conversation_history:
|
||||
for item in conversation_history[-5:]:
|
||||
messages.append({
|
||||
"role": "assistant",
|
||||
"content": f"[Agent {item['agent_id']}] {item['message']}"
|
||||
})
|
||||
|
||||
# 添加当前消息
|
||||
messages.append({"role": "user", "content": message})
|
||||
|
||||
# 配置 LLM
|
||||
model_params = agent_config.get("model_parameters", {})
|
||||
extra_params = {
|
||||
"temperature": model_params.get("temperature", 0.7),
|
||||
"max_tokens": model_params.get("max_tokens", 2000)
|
||||
}
|
||||
|
||||
# 如果有工具，添加到配置中
|
||||
if tools:
|
||||
extra_params["tools"] = tools
|
||||
extra_params["tool_choice"] = "auto"
|
||||
|
||||
model_config = RedBearModelConfig(
|
||||
model_name=agent_config["model_name"],
|
||||
provider=agent_config["provider"],
|
||||
api_key=agent_config["api_key"],
|
||||
base_url=agent_config.get("api_base"),
|
||||
extra_params=extra_params
|
||||
)
|
||||
|
||||
# 创建 LLM 实例
|
||||
llm = RedBearLLM(model_config, type=ModelType.CHAT)
|
||||
|
||||
# 调用 LLM
|
||||
response = await llm.ainvoke(messages)
|
||||
|
||||
# 解析响应
|
||||
result = {
|
||||
"content": "",
|
||||
"tool_calls": [],
|
||||
"usage": {}
|
||||
}
|
||||
|
||||
if hasattr(response, 'content'):
|
||||
result["content"] = response.content
|
||||
else:
|
||||
result["content"] = str(response)
|
||||
|
||||
# 提取工具调用
|
||||
if hasattr(response, 'tool_calls') and response.tool_calls:
|
||||
for tool_call in response.tool_calls:
|
||||
result["tool_calls"].append({
|
||||
"name": tool_call.function.name if hasattr(tool_call, 'function') else tool_call.name,
|
||||
"arguments": json.loads(tool_call.function.arguments) if hasattr(tool_call, 'function') else tool_call.arguments
|
||||
})
|
||||
|
||||
# 提取 usage
|
||||
if hasattr(response, 'usage_metadata'):
|
||||
result["usage"] = {
|
||||
"prompt_tokens": response.usage_metadata.get("input_tokens", 0),
|
||||
"completion_tokens": response.usage_metadata.get("output_tokens", 0),
|
||||
"total_tokens": response.usage_metadata.get("total_tokens", 0)
|
||||
}
|
||||
|
||||
return result
|
||||
|
||||
except Exception as e:
|
||||
logger.error(f"LLM 调用失败: {str(e)}", exc_info=True)
|
||||
raise
|
||||
|
||||
def _build_system_prompt_with_tools(self, base_prompt: str, tools: List[Dict[str, Any]]) -> str:
|
||||
"""构建包含工具说明的系统提示
|
||||
|
||||
Args:
|
||||
base_prompt: 基础提示词
|
||||
tools: 工具列表
|
||||
|
||||
Returns:
|
||||
增强的系统提示
|
||||
"""
|
||||
if not tools:
|
||||
return base_prompt
|
||||
|
||||
tools_desc = "\n\n## 可用的协作工具\n\n"
|
||||
tools_desc += "当你发现用户的问题超出你的专业领域时，可以使用以下工具切换到专业的 Agent：\n\n"
|
||||
|
||||
for tool in tools:
|
||||
func = tool.get("function", {})
|
||||
tools_desc += f"- **{func.get('name')}**: {func.get('description')}\n"
|
||||
|
||||
tools_desc += "\n请根据用户问题的性质，判断是否需要切换到其他专业 Agent。"
|
||||
tools_desc += "如果需要切换，请调用相应的工具并说明原因。"
|
||||
|
||||
return base_prompt + tools_desc
|
||||
|
||||
def _build_enhanced_message(
|
||||
self,
|
||||
message: str,
|
||||
conversation_id: str,
|
||||
agent_id: str,
|
||||
conversation_history: List[Dict[str, Any]]
|
||||
) -> str:
|
||||
"""构建增强的消息（包含 handoff 上下文）
|
||||
|
||||
Args:
|
||||
message: 原始消息
|
||||
conversation_id: 会话 ID
|
||||
agent_id: 当前 Agent ID
|
||||
conversation_history: 会话历史
|
||||
|
||||
Returns:
|
||||
增强后的消息
|
||||
"""
|
||||
# 获取 handoff 上下文
|
||||
handoff_context = self.handoff_manager.get_handoff_context_for_agent(
|
||||
conversation_id,
|
||||
agent_id
|
||||
)
|
||||
|
||||
if not handoff_context and not conversation_history:
|
||||
return message
|
||||
|
||||
# 构建上下文前缀
|
||||
context_parts = []
|
||||
|
||||
if handoff_context:
|
||||
context_parts.append(f"[协作上下文] {handoff_context}")
|
||||
|
||||
if conversation_history:
|
||||
context_parts.append("[之前的对话]")
|
||||
for item in conversation_history[-3:]: # 只保留最近3轮
|
||||
context_parts.append(
|
||||
f"- Agent {item['agent_id']}: {item['message'][:100]}"
|
||||
)
|
||||
|
||||
context_parts.append(f"\n[当前问题] {message}")
|
||||
|
||||
return "\n".join(context_parts)
|
||||
|
||||
|
||||
def _build_tools_with_handoffs(
|
||||
self,
|
||||
handoff_tools: List[AgentHandoffTool]
|
||||
) -> List[Dict[str, Any]]:
|
||||
"""构建包含 handoff 工具的工具列表（已废弃，使用动态工具创建）
|
||||
|
||||
Args:
|
||||
handoff_tools: Handoff 工具列表
|
||||
|
||||
Returns:
|
||||
工具 schema 列表
|
||||
"""
|
||||
# 这个方法已被 DynamicHandoffToolCreator 替代
|
||||
# 保留用于向后兼容
|
||||
tools = []
|
||||
for tool in handoff_tools:
|
||||
tools.append(tool.to_tool_schema())
|
||||
return tools
|
||||
|
||||
async def execute_stream_with_handoffs(
|
||||
self,
|
||||
message: str,
|
||||
conversation_id: Optional[str] = None,
|
||||
user_id: Optional[str] = None,
|
||||
variables: Optional[Dict[str, Any]] = None,
|
||||
initial_agent_id: Optional[str] = None
|
||||
) -> AsyncGenerator[str, None]:
|
||||
"""流式执行支持 handoffs 的多 Agent 协作
|
||||
|
||||
Args:
|
||||
message: 用户消息
|
||||
conversation_id: 会话 ID
|
||||
user_id: 用户 ID
|
||||
variables: 变量参数
|
||||
initial_agent_id: 初始 Agent ID
|
||||
|
||||
Yields:
|
||||
SSE 格式的事件流
|
||||
"""
|
||||
if not conversation_id:
|
||||
conversation_id = str(uuid.uuid4())
|
||||
|
||||
# 发送开始事件
|
||||
yield f"data: {json.dumps({'event': 'start', 'conversation_id': conversation_id})}\n\n"
|
||||
|
||||
try:
|
||||
# 执行协作
|
||||
result = await self.execute_with_handoffs(
|
||||
message=message,
|
||||
conversation_id=conversation_id,
|
||||
user_id=user_id,
|
||||
variables=variables,
|
||||
initial_agent_id=initial_agent_id
|
||||
)
|
||||
|
||||
# 发送结果事件
|
||||
yield f"data: {json.dumps({'event': 'message', 'data': result})}\n\n"
|
||||
|
||||
# 发送结束事件
|
||||
yield f"data: {json.dumps({'event': 'end'})}\n\n"
|
||||
|
||||
except Exception as e:
|
||||
logger.error(f"流式执行失败: {str(e)}")
|
||||
yield f"data: {json.dumps({'event': 'error', 'error': str(e)})}\n\n"
|
||||
Reference in New Issue
Block a user