o 2c @sdddlZddlmZmZmZmZdaiZdZ Gdddej j Z ddZ dd Zd d Zd d ZdS)N)SocketDatagramSocket StreamSocketBackendFc@s eZdZdS)AsyncLibraryNotFoundErrorN)__name__ __module__ __qualname__r r F/var/www/html/gps/gps/lib/python3.10/site-packages/dns/asyncbackend.pyrsrcCst|}|r |S|dkrddl}|j}n#|dkr%ddl}|j}n|dkr3ddl}|j}nt d||t|<|S)zGet 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. triorNcurioasynciozunimplemented async backend ) _backendsgetdns._trio_backend _trio_backendrdns._curio_backend_curio_backenddns._asyncio_backend_asyncio_backendNotImplementedError)namebackenddnsr r r get_backends    rc Csztrtddl}z|WWS|jytdwtyMddl}z|WYdSty9tdtyL|j sHtdYYdSww)zAttempt 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 libraryrzno async library detected) _no_sniffio ImportErrorsniffiocurrent_async_libraryrrget_running_loop RuntimeErrorAttributeErrorTask current_task)rrr r r sniff2s,     r%cCstrtSttS)z;Get the default backend, initializing it if necessary. )_default_backendset_default_backendr%r r r r get_default_backendQs r(cCs 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. )rr&)rr r r r'Zs r') dns.exceptionrdns._asyncbackendrrrrr&rr exception DNSExceptionrrr%r(r'r r r r s