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from hashlib import md5

# Calculate response hash to authentication challenge
def calc_auth_response(username, password, realm, nonce, digest_uri, method):
    ha1 = md5('%s:%s:%s' % (username, realm, password)).hexdigest()
    ha2 = md5('%s:%s' % (method, digest_uri)).hexdigest()
    response = md5('%s:%s:%s' % (ha1, nonce, ha2)).hexdigest()
    return response

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# Derived from Singleton class by Dan Pascu on python-application package

from new import instancemethod
from weakref import WeakValueDictionary

from application.python.decorator import preserve_signature


class WeakSingleton(type):
    """

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<?php
    $host ='1.2.3.4';
    $port = 25061;
    $timeout = 10;
    $cert = '/tmp/mediaproxy.pem';
    $context = stream_context_create(array('ssl'=>array('local_cert'=> $cert,)));
    $fp = stream_socket_client('tcp://'.$host.':'.$port, $errno, $errstr, 30, STREAM_CLIENT_CONNECT, $context);
    if (!$fp) {
        echo "ERROR: $errno - $errstr\n";
    } else {

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server.modules += ( "mod_fastcgi" )
fastcgi.server = ( ".php" =>
                    ( "localhost" =>
                        (
                            "host" => "127.0.0.1",
                            "port" => "9000"
                        )
                    )
                 )

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# coding=utf8

# Copyright (C) 2011 Saúl Ibarra Corretgé <[email protected]>
#
__all__ = ['Database', 'DatabaseError']

from threading import Thread
from sqlobject import connectionForURI, sqlhub, SQLObject, StringCol
from twisted.internet import reactor
from twisted.internet.threads import deferToThreadPool

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pool = ThreadPool(minthreads=1, maxthreads=1, name='db-ops')
pool.start()
reactor.addSystemEventTrigger('after', 'shutdown', pool.stop)

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def run_in_db_thread(func):
    """Decorator to run DB queries in Twisted's thread pool"""
    def wrapper(*args, **kw):
        return deferToThreadPool(reactor, pool, func, *args, **kw)
    return wrapper

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In [1]: class Foo(object):
   ...:     def __init__(self, bar=[]):
   ...:         self.bar = bar
   ...:
   ...:

In [2]: f1 = Foo()

In [3]: f2 = Foo()

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In [1]: class Foo(object):
   ...:     def __init__(self, bar=5):
   ...:         self.bar = bar
   ...:
   ...:

In [2]: f1 = Foo()

In [3]: f2 = Foo()

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In [1]: class Foo(object):
   ...:     def __init__(self, bar=None):
   ...:         self.bar = bar or []
   ...:
   ...:

In [2]: f1 = Foo()

In [3]: f2 = Foo()