Google
Edit File: asyncbackend.cpython-39.opt-1.pyc
a �M�e� � @ s� U d dl mZ d dlZd dlmZmZmZmZ da i Z ee ef e d< dZ G dd� dejj�Ze ed�d d �Ze d �d d �Zed �dd�Ze ed�dd�ZdS )� )�DictN)�Backend�DatagramSocket�Socket� StreamSocket� _backendsFc @ s e Zd ZdS )�AsyncLibraryNotFoundErrorN)�__name__� __module__� __qualname__� r r �4/usr/lib/python3.9/site-packages/dns/asyncbackend.pyr s r )�name�returnc C sd t �| �}|r|S | dkr.ddl}|j�� }n*| dkrJddl}|j�� }ntd| � ���|t | < |S )z�Get the specified asynchronous backend. *name*, a ``str``, the name of the backend. Currently the "trio" and "asyncio" backends are available. Raises NotImplementedError if an unknown backend name is specified. Ztrior N�asyncioz unimplemented async backend )r �getZdns._trio_backendZ _trio_backendr Zdns._asyncio_backendZ_asyncio_backend�NotImplementedError)r Zbackend�dnsr r r � get_backend s r )r c C s� z>t r t�ddl} z | �� W W S | jy: td��Y n0 W nF ty� ddl}z|�� W Y dS ty~ td��Y n0 Y n0 dS )z�Attempt to determine the in-use asynchronous I/O library by using the ``sniffio`` module if it is available. Returns the name of the library, or raises AsyncLibraryNotFoundError if the library cannot be determined. r Nz&sniffio cannot determine async libraryr zno async library detected)� _no_sniffio� ImportError�sniffioZcurrent_async_libraryr r Zget_running_loop� RuntimeError)r r r r r �sniff7 s r c C s t rt S tt� �S )z6Get the default backend, initializing it if necessary.)�_default_backend�set_default_backendr r r r r �get_default_backendR s r c C s t | �atS )a, Set the default backend. It's not normally necessary to call this method, as ``get_default_backend()`` will initialize the backend appropriately in many cases. If ``sniffio`` is not installed, or in testing situations, this function allows the backend to be set explicitly. )r r )r r r r r Z s r )�typingr Z dns.exceptionr Zdns._asyncbackendr r r r r r �str�__annotations__r � exceptionZ DNSExceptionr r r r r r r r r �<module> s