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50 lines
1.6 KiB
Python
50 lines
1.6 KiB
Python
from __future__ import annotations
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from typing import Type
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from pydantic import BaseModel
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from langchain.tools.playwright.base import BaseBrowserTool
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from langchain.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 NavigateBackTool(BaseBrowserTool):
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"""Navigate back to the previous page in the browser history."""
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name: str = "previous_webpage"
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description: str = "Navigate back to the previous page in the browser history"
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args_schema: Type[BaseModel] = BaseModel
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def _run(self) -> str:
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"""Use the tool."""
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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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response = page.go_back()
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if response:
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return (
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f"Navigated back to the previous page with URL '{response.url}'."
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f" Status code {response.status}"
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)
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else:
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return "Unable to navigate back; no previous page in the history"
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async def _arun(self) -> 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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page = await aget_current_page(self.async_browser)
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response = await page.go_back()
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if response:
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return (
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f"Navigated back to the previous page with URL '{response.url}'."
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f" Status code {response.status}"
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)
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else:
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return "Unable to navigate back; no previous page in the history"
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