
    Ϫf                         d Z ddlmZ ddlmZmZ ddlmZmZm	Z	  G d d      Z
 eej                         G d dej                               Zy	)
z
Lookup a name using multiple resolvers.

Future Plans: This needs someway to specify which resolver answered
the query, or someway to specify (authority|ttl|cache behavior|more?)
    )implementer)defer
interfaces)commondnserrorc                       e Zd Zd Zd Zy)FailureHandlerc                 .    || _         || _        || _        y N)resolverquerytimeout)selfr   r   r   s       7/usr/lib/python3/dist-packages/twisted/names/resolve.py__init__zFailureHandler.__init__   s     
    c                     |j                  t        j                  t        j                  t
               | j                  | j                  | j                        S r   )	trapr   DomainErrorr   TimeoutErrorNotImplementedErrorr   r   r   )r   failures     r   __call__zFailureHandler.__call__   s6    S__e&8&8:MN}}TZZ66r   N)__name__
__module____qualname__r   r    r   r   r
   r
      s    
7r   r
   c                   $    e Zd ZdZd Zd ZddZy)ResolverChainz8
    Lookup an address using multiple L{IResolver}s
    c                 P    t         j                  j                  |        || _        y)zi
        @type resolvers: L{list}
        @param resolvers: A L{list} of L{IResolver} providers.
        N)r   ResolverBaser   	resolvers)r   r#   s     r   r   zResolverChain.__init__%   s    
 	$$T*"r   c                 L   | j                   s't        j                  t        j                               S t        j                  |||      }| j                   d   j                  ||      }| j                   dd D ](  }|j                  t        |j                  ||            }* |S )aN  
        Build a L{dns.Query} for the given parameters and dispatch it
        to each L{IResolver} in C{self.resolvers} until an answer or
        L{error.AuthoritativeDomainError} is returned.

        @type name: C{str}
        @param name: DNS name to resolve.

        @type type: C{int}
        @param type: DNS record type.

        @type cls: C{int}
        @param cls: DNS record class.

        @type timeout: Sequence of C{int}
        @param timeout: Number of seconds after which to reissue the query.
            When the last timeout expires, the query is considered failed.

        @rtype: L{Deferred}
        @return: A L{Deferred} which fires with a three-tuple of lists of
            L{twisted.names.dns.RRHeader} instances.  The first element of the
            tuple gives answers.  The second element of the tuple gives
            authorities.  The third element of the tuple gives additional
            information.  The L{Deferred} may instead fail with one of the
            exceptions defined in L{twisted.names.error} or with
            C{NotImplementedError}.
        r      N)
r#   r   failr   r   r   Queryr   
addErrbackr
   )r   nameclstyper   qdrs           r   _lookupzResolverChain._lookup-   s    8 ~~::e//122IIdD#&NN1##Aw/# 	BA^AGGQ@AA	Br   Nc                    | j                   s't        j                  t        j                               S | j                   d   j                  ||      }| j                   dd  D ](  }|j                  t        |j
                  ||            }* |S )Nr   r%   )r#   r   r&   r   r   lookupAllRecordsr(   r
   )r   r)   r   r-   r.   s        r   r1   zResolverChain.lookupAllRecordsQ   s|    
 ~~::e//122NN1..tW=# 	PA^A,>,>gNOA	Pr   r   )r   r   r   __doc__r   r/   r1   r   r   r   r    r       s    #"H
r   r    N)r2   zope.interfacer   twisted.internetr   r   twisted.namesr   r   r   r
   	IResolverr"   r    r   r   r   <module>r7      sN   
 ' . , ,	7 	7 Z!!";F'' ; #;r   