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9639457222
Issue: we have several helper functions to import third-party libraries like tools.gmail.utils.import_google in [community.tools](https://api.python.langchain.com/en/latest/community_api_reference.html#id37). And we have core.utils.utils.guard_import that works exactly for this purpose. The import_<package> functions work inconsistently and rather be private functions. Change: replaced these functions with the guard_import function. Related to #21133
60 lines
2.1 KiB
Python
60 lines
2.1 KiB
Python
from __future__ import annotations
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from typing import TYPE_CHECKING, Optional, Tuple, Type
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from langchain_core.pydantic_v1 import root_validator
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from langchain_core.tools import BaseTool
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from langchain_core.utils import guard_import
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if TYPE_CHECKING:
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from playwright.async_api import Browser as AsyncBrowser
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from playwright.sync_api import Browser as SyncBrowser
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else:
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try:
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# We do this so pydantic can resolve the types when instantiating
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from playwright.async_api import Browser as AsyncBrowser
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from playwright.sync_api import Browser as SyncBrowser
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except ImportError:
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pass
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def lazy_import_playwright_browsers() -> Tuple[Type[AsyncBrowser], Type[SyncBrowser]]:
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"""
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Lazy import playwright browsers.
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Returns:
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Tuple[Type[AsyncBrowser], Type[SyncBrowser]]:
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AsyncBrowser and SyncBrowser classes.
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"""
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return (
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guard_import(module_name="playwright.async_api").AsyncBrowser,
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guard_import(module_name="playwright.sync_api").SyncBrowser,
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)
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class BaseBrowserTool(BaseTool):
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"""Base class for browser tools."""
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sync_browser: Optional["SyncBrowser"] = None
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async_browser: Optional["AsyncBrowser"] = None
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@root_validator
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def validate_browser_provided(cls, values: dict) -> dict:
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"""Check that the arguments are valid."""
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guard_import(module_name="playwright.async_api").AsyncBrowser
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guard_import(module_name="playwright.sync_api").SyncBrowser
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if values.get("async_browser") is None and values.get("sync_browser") is None:
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raise ValueError("Either async_browser or sync_browser must be specified.")
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return values
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@classmethod
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def from_browser(
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cls,
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sync_browser: Optional[SyncBrowser] = None,
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async_browser: Optional[AsyncBrowser] = None,
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) -> BaseBrowserTool:
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"""Instantiate the tool."""
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guard_import(module_name="playwright.async_api").AsyncBrowser
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guard_import(module_name="playwright.sync_api").SyncBrowser
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return cls(sync_browser=sync_browser, async_browser=async_browser)
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