mirror of
https://github.com/hwchase17/langchain.git
synced 2025-06-12 01:46:12 +00:00
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
|
|
|
|
from typing import TYPE_CHECKING, Optional, Tuple, Type
|
|
|
|
from langchain_core.pydantic_v1 import root_validator
|
|
from langchain_core.tools import BaseTool
|
|
from langchain_core.utils import guard_import
|
|
|
|
if TYPE_CHECKING:
|
|
from playwright.async_api import Browser as AsyncBrowser
|
|
from playwright.sync_api import Browser as SyncBrowser
|
|
else:
|
|
try:
|
|
# We do this so pydantic can resolve the types when instantiating
|
|
from playwright.async_api import Browser as AsyncBrowser
|
|
from playwright.sync_api import Browser as SyncBrowser
|
|
except ImportError:
|
|
pass
|
|
|
|
|
|
def lazy_import_playwright_browsers() -> Tuple[Type[AsyncBrowser], Type[SyncBrowser]]:
|
|
"""
|
|
Lazy import playwright browsers.
|
|
|
|
Returns:
|
|
Tuple[Type[AsyncBrowser], Type[SyncBrowser]]:
|
|
AsyncBrowser and SyncBrowser classes.
|
|
"""
|
|
return (
|
|
guard_import(module_name="playwright.async_api").AsyncBrowser,
|
|
guard_import(module_name="playwright.sync_api").SyncBrowser,
|
|
)
|
|
|
|
|
|
class BaseBrowserTool(BaseTool):
|
|
"""Base class for browser tools."""
|
|
|
|
sync_browser: Optional["SyncBrowser"] = None
|
|
async_browser: Optional["AsyncBrowser"] = None
|
|
|
|
@root_validator
|
|
def validate_browser_provided(cls, values: dict) -> dict:
|
|
"""Check that the arguments are valid."""
|
|
guard_import(module_name="playwright.async_api").AsyncBrowser
|
|
guard_import(module_name="playwright.sync_api").SyncBrowser
|
|
if values.get("async_browser") is None and values.get("sync_browser") is None:
|
|
raise ValueError("Either async_browser or sync_browser must be specified.")
|
|
return values
|
|
|
|
@classmethod
|
|
def from_browser(
|
|
cls,
|
|
sync_browser: Optional[SyncBrowser] = None,
|
|
async_browser: Optional[AsyncBrowser] = None,
|
|
) -> BaseBrowserTool:
|
|
"""Instantiate the tool."""
|
|
guard_import(module_name="playwright.async_api").AsyncBrowser
|
|
guard_import(module_name="playwright.sync_api").SyncBrowser
|
|
return cls(sync_browser=sync_browser, async_browser=async_browser)
|