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86 lines
2.9 KiB
Python
86 lines
2.9 KiB
Python
from __future__ import annotations
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from typing import Optional, Type
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from pydantic import BaseModel, Field
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from langchain.callbacks.manager import (
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AsyncCallbackManagerForToolRun,
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CallbackManagerForToolRun,
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)
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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 ClickToolInput(BaseModel):
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"""Input for ClickTool."""
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selector: str = Field(..., description="CSS selector for the element to click")
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class ClickTool(BaseBrowserTool):
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name: str = "click_element"
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description: str = "Click on an element with the given CSS selector"
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args_schema: Type[BaseModel] = ClickToolInput
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visible_only: bool = True
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"""Whether to consider only visible elements."""
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playwright_strict: bool = False
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"""Whether to employ Playwright's strict mode when clicking on elements."""
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playwright_timeout: float = 1_000
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"""Timeout (in ms) for Playwright to wait for element to be ready."""
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def _selector_effective(self, selector: str) -> str:
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if not self.visible_only:
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return selector
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return f"{selector} >> visible=1"
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def _run(
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self,
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selector: str,
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run_manager: Optional[CallbackManagerForToolRun] = None,
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) -> 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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# Navigate to the desired webpage before using this tool
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selector_effective = self._selector_effective(selector=selector)
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from playwright.sync_api import TimeoutError as PlaywrightTimeoutError
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try:
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page.click(
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selector_effective,
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strict=self.playwright_strict,
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timeout=self.playwright_timeout,
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)
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except PlaywrightTimeoutError:
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return f"Unable to click on element '{selector}'"
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return f"Clicked element '{selector}'"
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async def _arun(
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self,
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selector: str,
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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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page = await aget_current_page(self.async_browser)
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# Navigate to the desired webpage before using this tool
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selector_effective = self._selector_effective(selector=selector)
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from playwright.async_api import TimeoutError as PlaywrightTimeoutError
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try:
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await page.click(
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selector_effective,
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strict=self.playwright_strict,
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timeout=self.playwright_timeout,
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)
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except PlaywrightTimeoutError:
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return f"Unable to click on element '{selector}'"
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return f"Clicked element '{selector}'"
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