twisted.names.common

module documentation

(source)

Base functionality useful to various parts of Twisted Names.

Class	`ResolverBase`	`ResolverBase` is a base class for implementations of `interfaces.IResolver` which deals with a lot of the boilerplate of implementing all of the lookup methods.
Function	`extractRecord`	Resolve a name to an IP address, following CNAME records and NS referrals recursively.
Constant	`EMPTY_RESULT`	Undocumented
Variable	`typeToMethod`	Undocumented
Variable	`_ADD`	Undocumented
Variable	`_ANS`	Undocumented
Variable	`_AUTH`	Undocumented

def extractRecord(resolver, name, answers, level=10): (source) ¶

Resolve a name to an IP address, following CNAME records and NS referrals recursively.

This is an implementation detail of ResolverBase.getHostByName.

Parameters
resolver:`IResolver`	The resolver to use for the next query (unless handling an NS referral).
name:`dns.Name`	The name being looked up.
answers:`list` of `dns.RRHeader`	All of the records returned by the previous query (answers, authority, and additional concatenated).
level:`int`	Remaining recursion budget. This is decremented at each recursion. The query returns `None` when it reaches 0.
Returns
native `str` or `None`	The first IPv4 or IPv6 address (as a dotted quad or colon quibbles), or `None` when no result is found.

EMPTY_RESULT: tuple[tuple, ...] = (source) ¶

Undocumented

Value

((), (), ())

Undocumented

Undocumented

Undocumented

Undocumented