179 lines
6.9 KiB
Python
179 lines
6.9 KiB
Python
import json
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from typing import Any, List, Literal
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from pydantic import Field
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from app.agent.react import ReActAgent
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from app.logger import logger
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from app.prompt.toolcall import NEXT_STEP_PROMPT, SYSTEM_PROMPT
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from app.schema import AgentState, Message, ToolCall
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from app.tool import CreateChatCompletion, Terminate, ToolCollection
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TOOL_CALL_REQUIRED = "Tool calls required but none provided"
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class ToolCallAgent(ReActAgent):
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"""Base agent class for handling tool/function calls with enhanced abstraction"""
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name: str = "toolcall"
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description: str = "an agent that can execute tool calls."
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system_prompt: str = SYSTEM_PROMPT
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next_step_prompt: str = NEXT_STEP_PROMPT
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available_tools: ToolCollection = ToolCollection(
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CreateChatCompletion(), Terminate()
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)
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tool_choices: Literal["none", "auto", "required"] = "auto"
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special_tool_names: List[str] = Field(default_factory=lambda: [Terminate().name])
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tool_calls: List[ToolCall] = Field(default_factory=list)
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max_steps: int = 30
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async def think(self) -> bool:
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"""Process current state and decide next actions using tools"""
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if self.next_step_prompt:
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user_msg = Message.user_message(self.next_step_prompt)
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self.messages += [user_msg]
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# Get response with tool options
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response = await self.llm.ask_tool(
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messages=self.messages,
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system_msgs=[Message.system_message(self.system_prompt)]
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if self.system_prompt
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else None,
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tools=self.available_tools.to_params(),
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tool_choice=self.tool_choices,
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)
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self.tool_calls = response.tool_calls
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# Log response info in a more engaging way
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logger.info(f"✨ AI的思考过程：{response.content}")
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logger.info(
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f"🛠️ AI选择了 {len(response.tool_calls) if response.tool_calls else 0} 个工具来解决问题"
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)
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if response.tool_calls:
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logger.info(
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f"🧰 准备使用的工具箱：{[call.function.name for call in response.tool_calls]}"
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)
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try:
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# Handle different tool_choices modes
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if self.tool_choices == "none":
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if response.tool_calls:
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logger.warning("🤔 咦？AI想用工具，但现在不允许使用任何工具呢！")
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if response.content:
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self.memory.add_message(Message.assistant_message(response.content))
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return True
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return False
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# Create and add assistant message
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assistant_msg = (
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Message.from_tool_calls(
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content=response.content, tool_calls=self.tool_calls
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)
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if self.tool_calls
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else Message.assistant_message(response.content)
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)
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self.memory.add_message(assistant_msg)
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if self.tool_choices == "required" and not self.tool_calls:
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return True # Will be handled in act()
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# For 'auto' mode, continue with content if no commands but content exists
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if self.tool_choices == "auto" and not self.tool_calls:
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return bool(response.content)
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return bool(self.tool_calls)
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except Exception as e:
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logger.error(f"🚨 糟糕！AI思考时遇到了一点小问题：{e}")
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self.memory.add_message(
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Message.assistant_message(
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f"Error encountered while processing: {str(e)}"
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)
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)
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return False
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async def act(self) -> str:
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"""Execute tool calls and handle their results"""
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if not self.tool_calls:
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if self.tool_choices == "required":
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raise ValueError(TOOL_CALL_REQUIRED)
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# Return last message content if no tool calls
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return self.messages[-1].content or "No content or commands to execute"
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results = []
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for command in self.tool_calls:
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result = await self.execute_tool(command)
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logger.info(
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f"🎯 工具「{command.function.name}」完成任务啦！结果：{result[:100]}{'...' if len(result) > 100 else ''}"
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)
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# Add tool response to memory
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tool_msg = Message.tool_message(
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content=result, tool_call_id=command.id, name=command.function.name
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)
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self.memory.add_message(tool_msg)
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results.append(result)
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return "\n\n".join(results)
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async def execute_tool(self, command: ToolCall) -> str:
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"""Execute a single tool call with robust error handling"""
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if not command or not command.function or not command.function.name:
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return "Error: Invalid command format"
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name = command.function.name
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if name not in self.available_tools.tool_map:
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return f"Error: Unknown tool '{name}'"
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try:
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# Parse arguments
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args = json.loads(command.function.arguments or "{}")
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# Execute the tool
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logger.info(f"🔧 正在启动工具：「{name}」...")
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result = await self.available_tools.execute(name=name, tool_input=args)
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# Format result for display
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observation = (
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f"Observed output of cmd `{name}` executed:\n{str(result)}"
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if result
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else f"Cmd `{name}` completed with no output"
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)
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# Handle special tools like `finish`
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await self._handle_special_tool(name=name, result=result)
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return observation
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except json.JSONDecodeError:
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error_msg = f"Error parsing arguments for {name}: Invalid JSON format"
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logger.error(f"📝 哎呀！「{name}」工具的参数格式不对 - JSON解析失败")
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return f"Error: {error_msg}"
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except Exception as e:
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error_msg = f"Error executing tool {name}: {str(e)}"
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logger.error(f"⚠️ 工具「{name}」执行时遇到了一点小麻烦：{str(e)}")
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return f"Error: {error_msg}"
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async def _handle_special_tool(self, name: str, result: Any, **kwargs):
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"""Handle special tool execution and state changes"""
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if not self._is_special_tool(name):
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return
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if self._should_finish_execution(name=name, result=result, **kwargs):
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# Set agent state to finished
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logger.info(f"🏁 特殊工具「{name}」已完成任务，AI助手的工作告一段落！")
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self.state = AgentState.FINISHED
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@staticmethod
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def _should_finish_execution(**kwargs) -> bool:
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"""Determine if tool execution should finish the agent"""
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return True
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def _is_special_tool(self, name: str) -> bool:
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"""Check if tool name is in special tools list"""
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return name.lower() in [n.lower() for n in self.special_tool_names]
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