Function verify_installed_asyncio_event_loop

scrapy/utils/reactor.py:187–210

Raise :exc:`RuntimeError` if the even loop of the installed :class:`~twisted.internet.asyncioreactor.AsyncioSelectorReactor` does not match the specified import path or if no reactor is installed.

(loop_path: str)

def verify_installed_asyncio_event_loop(loop_path: str) -> None:
    """Raise :exc:`RuntimeError` if the even loop of the installed
    :class:`~twisted.internet.asyncioreactor.AsyncioSelectorReactor`
    does not match the specified import path or if no reactor is installed."""
    if not is_reactor_installed():
        raise RuntimeError(
            "verify_installed_asyncio_event_loop() called without an installed reactor."
        )

    from twisted.internet import reactor

    loop_class = load_object(loop_path)
    if isinstance(reactor._asyncioEventloop, loop_class):
        return
    installed = (
        f"{reactor._asyncioEventloop.__class__.__module__}"
        f".{reactor._asyncioEventloop.__class__.__qualname__}"
    )
    raise RuntimeError(
        "Scrapy found an asyncio Twisted reactor already "
        f"installed, and its event loop class ({installed}) does "
        "not match the one specified in the ASYNCIO_EVENT_LOOP "
        f"setting ({global_object_name(loop_class)})"
    )


def is_reactor_installed() -> bool: