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| from __future__ import annotations | |
| from enum import Enum | |
| from abc import ABC, abstractmethod | |
| from typing import Any, Callable, Optional, Type, Tuple | |
| from pydantic import BaseModel | |
| from langchain.llms.base import BaseLLM | |
| from langchain.agents.agent import AgentExecutor | |
| from langchain.agents import load_tools | |
| class ToolScope(Enum): | |
| GLOBAL = "global" | |
| SESSION = "session" | |
| class ToolException(Exception): | |
| pass | |
| class BaseTool(ABC): | |
| name: str | |
| description: str | |
| def run(self, *args: Any, **kwargs: Any) -> Any: | |
| pass | |
| async def arun(self, *args: Any, **kwargs: Any) -> Any: | |
| pass | |
| def __call__(self, *args: Any, **kwargs: Any) -> Any: | |
| return self.run(*args, **kwargs) | |
| class Tool(BaseTool): | |
| def __init__(self, name: str, description: str, func: Callable[..., Any]): | |
| self.name = name | |
| self.description = description | |
| self.func = func | |
| def run(self, *args: Any, **kwargs: Any) -> Any: | |
| try: | |
| return self.func(*args, **kwargs) | |
| except ToolException as e: | |
| raise e | |
| async def arun(self, *args: Any, **kwargs: Any) -> Any: | |
| try: | |
| return await self.func(*args, **kwargs) | |
| except ToolException as e: | |
| raise e | |
| class StructuredTool(BaseTool): | |
| def __init__( | |
| self, | |
| name: str, | |
| description: str, | |
| args_schema: Type[BaseModel], | |
| func: Callable[..., Any] | |
| ): | |
| self.name = name | |
| self.description = description | |
| self.args_schema = args_schema | |
| self.func = func | |
| def run(self, *args: Any, **kwargs: Any) -> Any: | |
| try: | |
| return self.func(*args, **kwargs) | |
| except ToolException as e: | |
| raise e | |
| async def arun(self, *args: Any, **kwargs: Any) -> Any: | |
| try: | |
| return await self.func(*args, **kwargs) | |
| except ToolException as e: | |
| raise e | |
| SessionGetter = Callable[[], Tuple[str, AgentExecutor]] | |
| class ToolWrapper: | |
| def __init__(self, name: str, description: str, scope: ToolScope, func): | |
| self.name = name | |
| self.description = description | |
| self.scope = scope | |
| self.func = func | |
| def is_global(self) -> bool: | |
| return self.scope == ToolScope.GLOBAL | |
| def is_per_session(self) -> bool: | |
| return self.scope == ToolScope.SESSION | |
| def to_tool(self, get_session: SessionGetter = lambda: []) -> BaseTool: | |
| if self.is_per_session(): | |
| self.func = lambda *args, **kwargs: self.func(*args, **kwargs, get_session=get_session) | |
| return Tool(name=self.name, description=self.description, func=self.func) | |
| class BaseToolSet: | |
| def tool_wrappers(cls) -> list[ToolWrapper]: | |
| methods = [getattr(cls, m) for m in dir(cls) if hasattr(getattr(cls, m), "is_tool")] | |
| return [ToolWrapper(m.name, m.description, m.scope, m) for m in methods] | |
| class ToolCreator(ABC): | |
| def create_tools(self, toolsets: list[BaseToolSet]) -> list[BaseTool]: | |
| pass | |
| class GlobalToolsCreator(ToolCreator): | |
| def create_tools(self, toolsets: list[BaseToolSet]) -> list[BaseTool]: | |
| tools = [] | |
| for toolset in toolsets: | |
| tools.extend( | |
| ToolsFactory.from_toolset( | |
| toolset=toolset, | |
| only_global=True, | |
| ) | |
| ) | |
| return tools | |
| class SessionToolsCreator(ToolCreator): | |
| def create_tools(self, toolsets: list[BaseToolSet], get_session: SessionGetter = lambda: []) -> list[BaseTool]: | |
| tools = [] | |
| for toolset in toolsets: | |
| tools.extend( | |
| ToolsFactory.from_toolset( | |
| toolset=toolset, | |
| only_per_session=True, | |
| get_session=get_session, | |
| ) | |
| ) | |
| return tools | |
| class ToolsFactory: | |
| def from_toolset(toolset: BaseToolSet, only_global: Optional[bool] = False, only_per_session: Optional[bool] = False, get_session: SessionGetter = lambda: []) -> list[BaseTool]: | |
| tools = [] | |
| for wrapper in toolset.tool_wrappers(): | |
| if only_global and not wrapper.is_global(): | |
| continue | |
| if only_per_session and not wrapper.is_per_session(): | |
| continue | |
| tools.append(wrapper.to_tool(get_session=get_session)) | |
| return tools | |
| def create_tools(tool_creator: ToolCreator, toolsets: list[BaseToolSet], get_session: SessionGetter = lambda: []): | |
| return tool_creator.create_tools(toolsets, get_session) | |
| def create_global_tools_from_names(toolnames: list[str], llm: Optional[BaseLLM]) -> list[BaseTool]: | |
| return load_tools(toolnames, llm=llm) | |