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A service that keeps one or more authorities up to date by doing hourly
zone transfers from a master.
@ivar primary: IP address of the master.
@type primary: L{str}
@ivar domains: An authority for each domain mirrored from the master.
@type domains: L{list} of L{SecondaryAuthority}
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@param primary: The IP address of the server from which to perform
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@type primary: L{str}
@param domains: A sequence of domain names for which to perform
zone transfers.
@type domains: L{list} of L{bytes}
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@type domains: sequence of L{bytes}
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An Authority that keeps itself updated by performing zone transfers.
@ivar primary: The IP address of the server from which zone transfers will
be attempted.
@type primary: L{str}
@ivar _port: The port number of the server from which zone transfers will
be attempted.
@type _port: L{int}
@ivar domain: The domain for which this is the secondary authority.
@type domain: L{bytes}
@ivar _reactor: The reactor to use to perform the zone transfers, or
L{None} to use the global reactor.
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Construct a new L{SecondaryAuthority} from a tuple giving a server
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@param domain: A C{bytes} giving the domain to transfer.
@type domain: L{bytes}
@return: A new instance of L{SecondaryAuthority}.
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Attempt a zone transfer.
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