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8180637345
- Add tests for Playwright tools schema serialization - Introduce base empty args Input class for BaseBrowserTool Test Plan: `poetry run pytest tests/unit_tests/tools/playwright/test_all.py` Fixes #26758 --------- Co-authored-by: Erick Friis <erick@langchain.dev> Co-authored-by: Eugene Yurtsev <eyurtsev@gmail.com>
74 lines
2.5 KiB
Python
74 lines
2.5 KiB
Python
from __future__ import annotations
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from typing import Any, Optional, Type
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from langchain_core.callbacks import (
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AsyncCallbackManagerForToolRun,
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CallbackManagerForToolRun,
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)
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from pydantic import BaseModel, model_validator
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from langchain_community.tools.playwright.base import BaseBrowserTool
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from langchain_community.tools.playwright.utils import (
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aget_current_page,
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get_current_page,
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)
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class ExtractTextToolInput(BaseModel):
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"""Explicit no-args input for ExtractTextTool."""
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class ExtractTextTool(BaseBrowserTool): # type: ignore[override, override]
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"""Tool for extracting all the text on the current webpage."""
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name: str = "extract_text"
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description: str = "Extract all the text on the current webpage"
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args_schema: Type[BaseModel] = ExtractTextToolInput
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@model_validator(mode="before")
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@classmethod
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def check_acheck_bs_importrgs(cls, values: dict) -> Any:
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"""Check that the arguments are valid."""
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try:
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from bs4 import BeautifulSoup # noqa: F401
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except ImportError:
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raise ImportError(
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"The 'beautifulsoup4' package is required to use this tool."
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" Please install it with 'pip install beautifulsoup4'."
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)
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return values
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def _run(self, run_manager: Optional[CallbackManagerForToolRun] = None) -> str:
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"""Use the tool."""
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# Use Beautiful Soup since it's faster than looping through the elements
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from bs4 import BeautifulSoup
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if self.sync_browser is None:
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raise ValueError(f"Synchronous browser not provided to {self.name}")
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page = get_current_page(self.sync_browser)
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html_content = page.content()
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# Parse the HTML content with BeautifulSoup
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soup = BeautifulSoup(html_content, "lxml")
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return " ".join(text for text in soup.stripped_strings)
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async def _arun(
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self, run_manager: Optional[AsyncCallbackManagerForToolRun] = None
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) -> str:
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"""Use the tool."""
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if self.async_browser is None:
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raise ValueError(f"Asynchronous browser not provided to {self.name}")
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# Use Beautiful Soup since it's faster than looping through the elements
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from bs4 import BeautifulSoup
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page = await aget_current_page(self.async_browser)
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html_content = await page.content()
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# Parse the HTML content with BeautifulSoup
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soup = BeautifulSoup(html_content, "lxml")
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return " ".join(text for text in soup.stripped_strings)
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