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@var default_resolver: The default resolver object
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    Instances of this class bundle up the result of a successful DNS
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    equivalent to "for a in answer.rrset", "answer[i]" is equivalent
    to "answer.rrset[i]", and "answer[i:j]" is equivalent to
    "answer.rrset[i:j]".

    Note that CNAMEs or DNAMEs in the response may mean that answer
    node's name might not be the query name.

    @ivar qname: The query name
    @type qname: dns.name.Name object
    @ivar rdtype: The query type
    @type rdtype: int
    @ivar rdclass: The query class
    @type rdclass: int
    @ivar response: The response message
    @type response: dns.message.Message object
    @ivar rrset: The answer
    @type rrset: dns.rrset.RRset object
    @ivar expiration: The time when the answer expires
    @type expiration: float (seconds since the epoch)
    @ivar canonical_name: The canonical name of the query name
    @type canonical_name: dns.name.Name object
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			tLRUCachecBsAeZdZdd�Zd�Zd�Zd�Zdd�ZRS(sOBounded least-recently-used DNS answer cache.

    This cache is better than the simple cache (above) if you're
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    it is full, the least-recently used node is removed to make space
    for a new one.

    @ivar data: A dictionary of cached data
    @type data: dict
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    @type nameservers: list of strings
    @ivar search: The search list.  If the query name is a relative name,
    the resolver will construct an absolute query name by appending the search
    names one by one to the query name.
    @type search: list of dns.name.Name objects
    @ivar port: The port to which to send queries.  The default is 53.
    @type port: int
    @ivar timeout: The number of seconds to wait for a response from a
    server, before timing out.
    @type timeout: float
    @ivar lifetime: The total number of seconds to spend trying to get an
    answer to the question.  If the lifetime expires, a Timeout exception
    will occur.
    @type lifetime: float
    @ivar keyring: The TSIG keyring to use.  The default is None.
    @type keyring: dict
    @ivar keyname: The TSIG keyname to use.  The default is None.
    @type keyname: dns.name.Name object
    @ivar keyalgorithm: The TSIG key algorithm to use.  The default is
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    @type keyalgorithm: string
    @ivar edns: The EDNS level to use.  The default is -1, no Edns.
    @type edns: int
    @ivar ednsflags: The EDNS flags
    @type ednsflags: int
    @ivar payload: The EDNS payload size.  The default is 0.
    @type payload: int
    @ivar flags: The message flags to use.  The default is None (i.e. not overwritten)
    @type flags: int
    @ivar cache: The cache to use.  The default is None.
    @type cache: dns.resolver.Cache object
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        @param configure: If True (the default), the resolver instance
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r1t:�nt@|||||�}|jrq|jjA|||f|�n|S(	sQuery nameservers to find the answer to the question.

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        of the appropriate type.  E.g. For I{rdtype} the integer 2 and the
        the string 'NS' both mean to query for records with DNS rdata type NS.

        @param qname: the query name
        @type qname: dns.name.Name object or string
        @param rdtype: the query type
        @type rdtype: int or string
        @param rdclass: the query class
        @type rdclass: int or string
        @param tcp: use TCP to make the query (default is False).
        @type tcp: bool
        @param source: bind to this IP address (defaults to machine default IP).
        @type source: IP address in dotted quad notation
        @param raise_on_no_answer: raise NoAnswer if there's no answer
        (defaults is True).
        @type raise_on_no_answer: bool
        @param source_port: The port from which to send the message.
        The default is 0.
        @type source_port: int
        @rtype: dns.resolver.Answer instance
        @raises Timeout: no answers could be found in the specified lifetime
        @raises NXDOMAIN: the query name does not exist
        @raises YXDOMAIN: the query name is too long after DNAME substitution
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