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Current File : /proc/114786/root/usr/lib/python3/dist-packages/twisted/internet/_resolver.py
# -*- test-case-name: twisted.internet.test.test_resolver -*-
# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.

"""
IPv6-aware hostname resolution.

@see: L{IHostnameResolver}
"""

from __future__ import division, absolute_import

__metaclass__ = type

from socket import (getaddrinfo, AF_INET, AF_INET6, AF_UNSPEC, SOCK_STREAM,
                    SOCK_DGRAM, gaierror)

from zope.interface import implementer

from twisted.internet.interfaces import (IHostnameResolver, IHostResolution,
                                         IResolverSimple, IResolutionReceiver)
from twisted.internet.error import DNSLookupError
from twisted.internet.defer import Deferred
from twisted.internet.threads import deferToThreadPool
from twisted.internet.address import IPv4Address, IPv6Address
from twisted.python.compat import nativeString
from twisted.internet._idna import _idnaBytes
from twisted.logger import Logger


@implementer(IHostResolution)
class HostResolution(object):
    """
    The in-progress resolution of a given hostname.
    """

    def __init__(self, name):
        """
        Create a L{HostResolution} with the given name.
        """
        self.name = name



_any = frozenset([IPv4Address, IPv6Address])

_typesToAF = {
    frozenset([IPv4Address]): AF_INET,
    frozenset([IPv6Address]): AF_INET6,
    _any: AF_UNSPEC,
}

_afToType = {
    AF_INET: IPv4Address,
    AF_INET6: IPv6Address,
}

_transportToSocket = {
    'TCP': SOCK_STREAM,
    'UDP': SOCK_DGRAM,
}

_socktypeToType = {
    SOCK_STREAM: 'TCP',
    SOCK_DGRAM: 'UDP',
}



@implementer(IHostnameResolver)
class GAIResolver(object):
    """
    L{IHostnameResolver} implementation that resolves hostnames by calling
    L{getaddrinfo} in a thread.
    """

    def __init__(self, reactor, getThreadPool=None, getaddrinfo=getaddrinfo):
        """
        Create a L{GAIResolver}.

        @param reactor: the reactor to schedule result-delivery on
        @type reactor: L{IReactorThreads}

        @param getThreadPool: a function to retrieve the thread pool to use for
            scheduling name resolutions.  If not supplied, the use the given
            C{reactor}'s thread pool.
        @type getThreadPool: 0-argument callable returning a
            L{twisted.python.threadpool.ThreadPool}

        @param getaddrinfo: a reference to the L{getaddrinfo} to use - mainly
            parameterized for testing.
        @type getaddrinfo: callable with the same signature as L{getaddrinfo}
        """
        self._reactor = reactor
        self._getThreadPool = (reactor.getThreadPool if getThreadPool is None
                               else getThreadPool)
        self._getaddrinfo = getaddrinfo


    def resolveHostName(self, resolutionReceiver, hostName, portNumber=0,
                        addressTypes=None, transportSemantics='TCP'):
        """
        See L{IHostnameResolver.resolveHostName}

        @param resolutionReceiver: see interface

        @param hostName: see interface

        @param portNumber: see interface

        @param addressTypes: see interface

        @param transportSemantics: see interface

        @return: see interface
        """
        pool = self._getThreadPool()
        addressFamily = _typesToAF[_any if addressTypes is None
                                   else frozenset(addressTypes)]
        socketType = _transportToSocket[transportSemantics]
        def get():
            try:
                return self._getaddrinfo(hostName, portNumber, addressFamily,
                                         socketType)
            except gaierror:
                return []
        d = deferToThreadPool(self._reactor, pool, get)
        resolution = HostResolution(hostName)
        resolutionReceiver.resolutionBegan(resolution)
        @d.addCallback
        def deliverResults(result):
            for family, socktype, proto, cannoname, sockaddr in result:
                addrType = _afToType[family]
                resolutionReceiver.addressResolved(
                    addrType(_socktypeToType.get(socktype, 'TCP'), *sockaddr)
                )
            resolutionReceiver.resolutionComplete()
        return resolution



@implementer(IHostnameResolver)
class SimpleResolverComplexifier(object):
    """
    A converter from L{IResolverSimple} to L{IHostnameResolver}.
    """

    _log = Logger()

    def __init__(self, simpleResolver):
        """
        Construct a L{SimpleResolverComplexifier} with an L{IResolverSimple}.
        """
        self._simpleResolver = simpleResolver


    def resolveHostName(self, resolutionReceiver, hostName, portNumber=0,
                        addressTypes=None, transportSemantics='TCP'):
        """
        See L{IHostnameResolver.resolveHostName}

        @param resolutionReceiver: see interface

        @param hostName: see interface

        @param portNumber: see interface

        @param addressTypes: see interface

        @param transportSemantics: see interface

        @return: see interface
        """
        # If it's str, we need to make sure that it's just ASCII.
        try:
            hostName = hostName.encode('ascii')
        except UnicodeEncodeError:
            # If it's not just ASCII, IDNA it. We don't want to give a Unicode
            # string with non-ASCII in it to Python 3, as if anyone passes that
            # to a Python 3 stdlib function, it will probably use the wrong
            # IDNA version and break absolutely everything
            hostName = _idnaBytes(hostName)

        # Make sure it's passed down as a native str, to maintain the interface
        hostName = nativeString(hostName)

        resolution = HostResolution(hostName)
        resolutionReceiver.resolutionBegan(resolution)
        onAddress = self._simpleResolver.getHostByName(hostName)
        def addressReceived(address):
            resolutionReceiver.addressResolved(IPv4Address('TCP', address,
                                                           portNumber))
        def errorReceived(error):
            if not error.check(DNSLookupError):
                self._log.failure("while looking up {name} with {resolver}",
                                  error, name=hostName,
                                  resolver=self._simpleResolver)
        onAddress.addCallbacks(addressReceived, errorReceived)
        def finish(result):
            resolutionReceiver.resolutionComplete()
        onAddress.addCallback(finish)
        return resolution



@implementer(IResolutionReceiver)
class FirstOneWins(object):
    """
    An L{IResolutionReceiver} which fires a L{Deferred} with its first result.
    """

    def __init__(self, deferred):
        """
        @param deferred: The L{Deferred} to fire when the first resolution
            result arrives.
        """
        self._deferred = deferred
        self._resolved = False


    def resolutionBegan(self, resolution):
        """
        See L{IResolutionReceiver.resolutionBegan}

        @param resolution: See L{IResolutionReceiver.resolutionBegan}
        """
        self._resolution = resolution


    def addressResolved(self, address):
        """
        See L{IResolutionReceiver.addressResolved}

        @param address: See L{IResolutionReceiver.addressResolved}
        """
        if self._resolved:
            return
        self._resolved = True
        self._deferred.callback(address.host)


    def resolutionComplete(self):
        """
        See L{IResolutionReceiver.resolutionComplete}
        """
        if self._resolved:
            return
        self._deferred.errback(DNSLookupError(self._resolution.name))



@implementer(IResolverSimple)
class ComplexResolverSimplifier(object):
    """
    A converter from L{IHostnameResolver} to L{IResolverSimple}
    """
    def __init__(self, nameResolver):
        """
        Create a L{ComplexResolverSimplifier} with an L{IHostnameResolver}.

        @param nameResolver: The L{IHostnameResolver} to use.
        """
        self._nameResolver = nameResolver


    def getHostByName(self, name, timeouts=()):
        """
        See L{IResolverSimple.getHostByName}

        @param name: see L{IResolverSimple.getHostByName}

        @param timeouts: see L{IResolverSimple.getHostByName}

        @return: see L{IResolverSimple.getHostByName}
        """
        result = Deferred()
        self._nameResolver.resolveHostName(FirstOneWins(result), name, 0,
                                           [IPv4Address])
        return result

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