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o �b� � @ sb d Z ddlmZ ddlmZmZ ddlmZmZm Z G dd� d�Z eej �G dd� dej ��Z d S ) 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 @ s e Zd Zdd� Zdd� ZdS )�FailureHandlerc C s || _ || _|| _d S �N)�resolver�query�timeout)�selfr r r � r �7/usr/lib/python3/dist-packages/twisted/names/resolve.py�__init__ s zFailureHandler.__init__c C s" |� tjtjt� | �| j| j�S r ) �trapr � DomainErrorr � TimeoutError�NotImplementedErrorr r r )r �failurer r r �__call__ s zFailureHandler.__call__N)�__name__� __module__� __qualname__r r r r r r r s r c @ s* e Zd ZdZdd� Zdd� Zd dd�ZdS ) � ResolverChainz8 Lookup an address using multiple L{IResolver}s c C s t j�| � || _dS )zi @type resolvers: L{list} @param resolvers: A L{list} of L{IResolver} providers. N)r � ResolverBaser � resolvers)r r r r r r % s zResolverChain.__init__c C s` | j s t�t�� �S t�|||�}| j d �||�}| j dd� D ] }|�t |j||��}q!|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�rr r r �_lookup- s zResolverChain._lookupNc C sR | j s t�t�� �S | j d �||�}| j dd � D ] }|�t|j||��}q|S )Nr r )r r r r r �lookupAllRecordsr r )r r! r r% r& r r r r( Q s z ResolverChain.lookupAllRecordsr )r r r �__doc__r r' r( r r r r r s $r N)r) �zope.interfacer �twisted.internetr r � twisted.namesr r r r � IResolverr r r r r r �<module> s
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