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https://github.com/jxxghp/MoviePilot.git
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74 lines
2.9 KiB
Python
74 lines
2.9 KiB
Python
from typing import Any, Optional
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from langchain.agents.middleware import AgentMiddleware, AgentState
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from langchain_core.messages import AIMessage, BaseMessage, ToolMessage
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from langgraph.runtime import Runtime
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from langgraph.types import Overwrite
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class PatchToolCallsMiddleware(AgentMiddleware):
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"""修复消息历史中悬空工具调用的中间件。"""
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@staticmethod
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def _build_cancelled_tool_message(tool_call: dict[str, Any]) -> ToolMessage:
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"""构造取消状态的工具响应消息。"""
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tool_name = tool_call.get("name") or "unknown_tool"
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tool_call_id = tool_call.get("id") or ""
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tool_msg = (
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f"Tool call {tool_name} with id {tool_call_id} was "
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"cancelled - another message came in before it could be completed."
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)
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return ToolMessage(
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content=tool_msg,
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name=tool_name,
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tool_call_id=tool_call_id,
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)
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@classmethod
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def _normalize_messages(cls, messages: list[BaseMessage]) -> list[BaseMessage]:
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"""规范化工具调用消息顺序，满足 OpenAI tool_calls 协议要求。"""
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if not messages or len(messages) == 0:
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return messages
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tool_messages = {
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msg.tool_call_id: msg
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for msg in messages
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if isinstance(msg, ToolMessage) and msg.tool_call_id
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}
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patched_messages = []
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for msg in messages:
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if isinstance(msg, ToolMessage):
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continue
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patched_messages.append(msg)
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if not isinstance(msg, AIMessage) or not msg.tool_calls:
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continue
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for tool_call in msg.tool_calls:
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tool_call_id = tool_call.get("id")
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corresponding_tool_msg = tool_messages.get(tool_call_id)
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if corresponding_tool_msg:
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patched_messages.append(corresponding_tool_msg)
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else:
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patched_messages.append(cls._build_cancelled_tool_message(tool_call))
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return patched_messages
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def before_agent(self, state: AgentState, runtime: Runtime[Any]) -> Optional[dict[str, Any]]: # noqa: ARG002
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"""在代理运行之前，处理任何 AIMessage 中悬空或乱序的工具调用。"""
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messages = state["messages"]
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patched_messages = self._normalize_messages(messages)
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if patched_messages == messages:
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return None
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return {"messages": Overwrite(patched_messages)}
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async def abefore_agent(self, state: AgentState, runtime: Runtime[Any]) -> Optional[dict[str, Any]]: # noqa: ARG002
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"""在代理异步运行之前，处理任何 AIMessage 中悬空或乱序的工具调用。"""
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messages = state["messages"]
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patched_messages = self._normalize_messages(messages)
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if patched_messages == messages:
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return None
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return {"messages": Overwrite(patched_messages)}
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