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from typing import Optional, Type | |
from langchain_core.pydantic_v1 import BaseModel, Field | |
from langchain.callbacks.manager import CallbackManagerForToolRun | |
from langchain.tools.base import BaseTool | |
from langchain.tools.file_management.utils import ( | |
INVALID_PATH_TEMPLATE, | |
BaseFileToolMixin, | |
FileValidationError, | |
) | |
class ReadFileInput(BaseModel): | |
"""Input for ReadFileTool.""" | |
file_path: str = Field(..., description="name of file") | |
class ReadFileTool(BaseFileToolMixin, BaseTool): | |
"""Tool that reads a file.""" | |
name: str = "read_file" | |
args_schema: Type[BaseModel] = ReadFileInput | |
description: str = "Read file from disk" | |
def _run( | |
self, | |
file_path: str, | |
run_manager: Optional[CallbackManagerForToolRun] = None, | |
) -> str: | |
try: | |
read_path = self.get_relative_path(file_path) | |
except FileValidationError: | |
return INVALID_PATH_TEMPLATE.format(arg_name="file_path", value=file_path) | |
if not read_path.exists(): | |
return f"Error: no such file or directory: {file_path}" | |
try: | |
with read_path.open("r", encoding="utf-8") as f: | |
content = f.read() | |
return content | |
except Exception as e: | |
return "Error: " + str(e) | |
# TODO: Add aiofiles method | |