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41 lines
1.3 KiB
Python
41 lines
1.3 KiB
Python
from __future__ import annotations
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from typing import TYPE_CHECKING, Any
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from pydantic import Field, root_validator
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from langchain.tools.base import BaseTool
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from langchain.tools.playwright.utils import create_playwright_browser, run_async
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if TYPE_CHECKING:
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from playwright.async_api import Browser as AsyncBrowser
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class BaseBrowserTool(BaseTool):
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"""Base class for browser tools."""
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browser: AsyncBrowser = Field(default_factory=create_playwright_browser)
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@root_validator
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def check_args(cls, values: dict) -> dict:
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"""Check that the arguments are valid."""
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try:
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from playwright.async_api import Browser as AsyncBrowser # noqa: F401
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except ImportError:
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raise ValueError(
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"The 'playwright' package is required to use this tool."
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" Please install it with 'pip install playwright'."
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)
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return values
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def _run(self, *args: Any, **kwargs: Any) -> str:
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"""Use the tool."""
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return run_async(self._arun(*args, **kwargs))
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@classmethod
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def from_browser(cls, browser: AsyncBrowser) -> BaseBrowserTool:
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from playwright.async_api import Browser as AsyncBrowser
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cls.update_forward_refs(AsyncBrowser=AsyncBrowser)
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return cls(browser=browser)
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