o j @sUddlmZddlZddlmZmZmZmZda iZ ee efe d<dZ GdddejjZde d efd d Zd e fd d Zd efddZde d efddZdS))DictN)BackendDatagramSocketSocket StreamSocket _backendsFc@s eZdZdS)AsyncLibraryNotFoundErrorN)__name__ __module__ __qualname__r r /root/aizidognhua/tmp/workspace/projects/ec89d86c-575f-41c9-af57-ac45cbdbf775/venv/lib/python3.10/site-packages/dns/asyncbackend.pyrsrnamereturncCsdt|}|r |S|dkrddl}|j}n|dkr%ddl}|j}ntd||t|<|S)zGet 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. triorNasynciozunimplemented async backend )rgetdns._trio_backend _trio_backendrdns._asyncio_backend_asyncio_backendNotImplementedError)rbackenddnsr r r get_backends   rc Csvztrtddl}z|WWS|jytdwty:ddl}z|WYdSty9tdww)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 RuntimeError)rrr r r sniff7s$   r!cCstrtSttS)z6Get the default backend, initializing it if necessary.)_default_backendset_default_backendr!r r r r get_default_backendRs r$cCs t|atS)a,Set the default backend. It's not normally necessary to call this method, as ``get_default_backend()`` will initialize the backend appropriately in many cases. If ``sniffio`` is not installed, or in testing situations, this function allows the backend to be set explicitly. )rr")rr r r r#Zs r#)typingr dns.exceptionrdns._asyncbackendrrrrr"rstr__annotations__r exception DNSExceptionrrr!r$r#r r r r s