twisted.names.resolve.ResolverChain

class documentation

class ResolverChain(common.ResolverBase): (source)

Implements interfaces: twisted.internet.interfaces.IResolver

Lookup an address using multiple IResolvers

Method	`__init__`
Method	`lookupAllRecords`	Perform an ALL_RECORD lookup.
Instance Variable	`resolvers`	Undocumented
Method	`_lookup`	Build a `dns.Query` for the given parameters and dispatch it to each `IResolver` in `self.resolvers` until an answer or `error.AuthoritativeDomainError` is returned.

Inherited from ResolverBase:

Method	`exceptionForCode`	Convert a response code (one of the possible values of `dns.Message.rCode` to an exception instance representing it.
Method	`getHostByName`	Resolve the domain name `name` into an IP address.
Method	`lookupAddress`	Perform an A record lookup.
Method	`lookupAddress6`	Perform an A6 record lookup.
Method	`lookupAFSDatabase`	Perform an AFSDB record lookup.
Method	`lookupAuthority`	Perform an SOA record lookup.
Method	`lookupCanonicalName`	Perform a CNAME record lookup.
Method	`lookupHostInfo`	Perform a HINFO record lookup.
Method	`lookupIPV6Address`	Perform an AAAA record lookup.
Method	`lookupMailBox`	Perform an MB record lookup.
Method	`lookupMailboxInfo`	Perform an MINFO record lookup.
Method	`lookupMailExchange`	Perform an MX record lookup.
Method	`lookupMailGroup`	Perform an MG record lookup.
Method	`lookupMailRename`	Perform an MR record lookup.
Method	`lookupNameservers`	Perform an NS record lookup.
Method	`lookupNamingAuthorityPointer`	Perform a NAPTR record lookup.
Method	`lookupNull`	Perform a NULL record lookup.
Method	`lookupPointer`	Perform a PTR record lookup.
Method	`lookupResponsibility`	Perform an RP record lookup.
Method	`lookupSenderPolicy`	Perform a SPF record lookup.
Method	`lookupService`	Perform an SRV record lookup.
Method	`lookupText`	Perform a TXT record lookup.
Method	`lookupWellKnownServices`	Perform a WKS record lookup.
Method	`lookupZone`	Perform an AXFR record lookup.
Method	`query`	Dispatch `query` to the method which can handle its type.
Instance Variable	`typeToMethod`	Undocumented
Method	`_cbRecords`	Undocumented
Class Variable	`_errormap`	A `dict` mapping DNS protocol failure response codes to exception classes which will be used to represent those failures.
Class Variable	`_log`	Undocumented

def __init__(self, resolvers): (source)

overrides twisted.names.common.ResolverBase.__init__

Parameters
resolvers:`list`	A `list` of `IResolver` providers.

def lookupAllRecords(self, name, timeout=None): (source)

from twisted.internet.interfaces.IResolver

overrides twisted.names.common.ResolverBase.lookupAllRecords

Perform an ALL_RECORD lookup.

Parameters
name	DNS name to resolve.
timeout	Number of seconds after which to reissue the query. When the last timeout expires, the query is considered failed.
Returns
A `Deferred` which fires with a three-tuple of lists of `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 `Deferred` may instead fail with one of the exceptions defined in `twisted.names.error` or with `NotImplementedError`.

resolvers = (source)

Undocumented

def _lookup(self, name, cls, type, timeout): (source)

overrides twisted.names.common.ResolverBase._lookup

Build a dns.Query for the given parameters and dispatch it to each IResolver in self.resolvers until an answer or error.AuthoritativeDomainError is returned.

Parameters
name:`str`	DNS name to resolve.
cls:`int`	DNS record class.
type:`int`	DNS record type.
timeout:Sequence of `int`	Number of seconds after which to reissue the query. When the last timeout expires, the query is considered failed.
Returns
`Deferred`	A `Deferred` which fires with a three-tuple of lists of `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 `Deferred` may instead fail with one of the exceptions defined in `twisted.names.error` or with `NotImplementedError`.