a sd_T ã@sdddlZddlmZmZmZmZdaiZdZ Gdd„dej j ƒZ dd„Z dd „Zd d „Zd d „ZdS)éN)ÚSocketÚDatagramSocketÚ StreamSocketÚBackendFc@s eZdZdS)ÚAsyncLibraryNotFoundErrorN)Ú__name__Ú __module__Ú __qualname__©r r ú2/usr/lib/python3/dist-packages/dns/asyncbackend.pyrsrcCs€t |¡}|r|S|dkr.ddl}|j ¡}nF|dkrJddl}|j ¡}n*|dkrfddl}|j ¡}nt d|›ƒ‚|t|<|S)zíGet the specified asychronous backend. *name*, a ``str``, the name of the backend. Currently the "trio", "curio", and "asyncio" backends are available. Raises NotImplementError if an unknown backend name is specified. ZtriorNZcurioÚasynciozunimplemented async backend ) Ú _backendsÚgetZdns._trio_backendZ _trio_backendrZdns._curio_backendZ_curio_backendZdns._asyncio_backendZ_asyncio_backendÚNotImplementedError)ÚnameZbackendÚdnsr r r Ú get_backends    rc Cs°z>tr t‚ddl}z | ¡WWS|jy:tdƒ‚Yn0Wnltyªddl}z| ¡WYdSty~tdƒ‚Yn(ty¤|j   ¡sœtdƒ‚YYdS0Yn0dS)zèAttempt 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. rNz&sniffio cannot determine async libraryr zno async library detected) Ú _no_sniffioÚ ImportErrorÚsniffioZcurrent_async_libraryrr Zget_running_loopÚ RuntimeErrorÚAttributeErrorZTaskZ current_task)rr r r r Úsniff.s&      rcCstrtSttƒƒS)z;Get the default backend, initializing it if necessary. )Ú_default_backendÚset_default_backendrr r r r Úget_default_backendLsrcCs t|ƒatS)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. )rr)rr r r rUs r)Z dns.exceptionrZdns._asyncbackendrrrrrr rZ exceptionZ DNSExceptionrrrrrr r r r Ús