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# ``twisted`.`names`.`cache`.`CacheResolver``

class documentation

`class CacheResolver(common.ResolverBase): (source)`

View In Hierarchy

A resolver that serves records from a local, memory cache.

Method | `__getstate__` | Undocumented
Method | `__init__` | Undocumented
Method | `__setstate__` | Undocumented
Method | `cacheResult` | Cache a DNS entry.
Method | `clearEntry` | Undocumented
Method | `lookupAllRecords` | Perform an ALL_RECORD lookup.
Instance Variable | `__dict__` | Undocumented
Instance Variable | `cache` | Undocumented
Instance Variable | `cancel` | Undocumented
Instance Variable | `verbose` | Undocumented
Method | `_lookup` | Undocumented
Instance Variable | `_reactor` | A provider of `interfaces.IReactorTime`.

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 __getstate__(self): (source)

Undocumented

def __init__(self, cache=None, verbose=0, reactor=None): (source)
overrides `twisted.names.common.ResolverBase.__init__`

Undocumented

def __setstate__(self, state): (source)

Undocumented

def cacheResult(self, query, payload, cacheTime=None): (source)

Cache a DNS entry.

Parameters
query | a `dns.Query` instance.
payload | a 3-tuple of lists of `dns.RRHeader` records, the matching result of the query (answers, authority and additional).
cacheTime | The time (seconds since epoch) at which the entry is considered to have been added to the cache. If `None` is given, the current time is used.

def clearEntry(self, query): (source)

Undocumented

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`.

__dict__ = (source)

Undocumented

cache: `dict` = (source)

Undocumented

cancel: `dict` = (source)

Undocumented

verbose = (source)

Undocumented

def _lookup(self, name, cls, type, timeout): (source)
overrides `twisted.names.common.ResolverBase._lookup`

Undocumented

_reactor = (source)

A provider of `interfaces.IReactorTime`.