def authenticate(self, clone_conn=None):
        if clone_conn:
            self.conn_class = clone_conn.conn_class
            self.storage_host = clone_conn.storage_host
            self.storage_url = clone_conn.storage_url
            self.storage_port = clone_conn.storage_port
            self.storage_token = clone_conn.storage_token
            return

        if self.auth_version == "1":
            auth_path = '%sv1.0' % (self.auth_prefix)
            if self.account:
                auth_user = '%s:%s' % (self.account, self.username)
            else:
                auth_user = self.username
        else:
            auth_user = self.username
            auth_path = self.auth_prefix
        auth_scheme = 'https://' if self.auth_ssl else 'http://'
        auth_netloc = "%s:%d" % (self.auth_host, self.auth_port)
        auth_url = auth_scheme + auth_netloc + auth_path

        (storage_url, storage_token) = get_auth(
            auth_url, auth_user, self.password, snet=False,
            tenant_name=self.account, auth_version=self.auth_version,
            os_options={})

        if not (storage_url and storage_token):
            raise AuthenticationFailed()

        x = storage_url.split('/')

        if x[0] == 'http:':
            self.conn_class = httplib.HTTPConnection
            self.storage_port = 80
        elif x[0] == 'https:':
            self.conn_class = httplib.HTTPSConnection
            self.storage_port = 443
        else:
            raise ValueError('unexpected protocol %s' % (x[0]))

        self.storage_host = x[2].split(':')[0]
        if ':' in x[2]:
            self.storage_port = int(x[2].split(':')[1])
        # Make sure storage_url is a string and not unicode, since
        # keystoneclient (called by swiftclient) returns them in
        # unicode and this would cause troubles when doing
        # no_safe_quote query.
        self.storage_url = str('/%s/%s' % (x[3], x[4]))
        self.account_name = str(x[4])
        self.auth_user = auth_user
        # With v2 keystone, storage_token is unicode.
        # We want it to be string otherwise this would cause
        # troubles when doing query with already encoded
        # non ascii characters in its headers.
        self.storage_token = str(storage_token)
        self.user_acl = '%s:%s' % (self.account, self.username)

        self.http_connect()
        return self.storage_url, self.storage_token

def main():
    options, commands = parser.parse_args()
    commands.remove('split-brain')
    if not commands:
        parser.print_help()
        return 'ERROR: must specify at least one command'
    for cmd_args in commands:
        cmd = cmd_args.split(':', 1)[0]
        if cmd not in BrainSplitter.__commands__:
            parser.print_help()
            return 'ERROR: unknown command %s' % cmd
    url, token = get_auth('http://127.0.0.1:8080/auth/v1.0',
                          'test:tester', 'testing')
    brain = BrainSplitter(url, token, options.container, options.object)
    for cmd_args in commands:
        parts = cmd_args.split(':', 1)
        command = parts[0]
        if len(parts) > 1:
            args = utils.list_from_csv(parts[1])
        else:
            args = ()
        try:
            brain.run(command, *args)
        except ClientException as e:
            print '**WARNING**: %s raised %s' % (command, e)
    print 'STATUS'.join(['*' * 25] * 2)
    brain.servers.status()
    sys.exit()

def reset_environment():
    call(['resetswift'])
    pids = {}
    try:
        port2server = {}
        for s, p in (('account', 6002), ('container', 6001), ('object', 6000)):
            for n in xrange(1, 5):
                pids['%s%d' % (s, n)] = \
                    Popen(['swift-%s-server' % s,
                           '/etc/swift/%s-server/%d.conf' % (s, n)]).pid
                port2server[p + (n * 10)] = '%s%d' % (s, n)
        pids['proxy'] = Popen(['swift-proxy-server',
                               '/etc/swift/proxy-server.conf']).pid
        account_ring = Ring('/etc/swift/account.ring.gz')
        container_ring = Ring('/etc/swift/container.ring.gz')
        object_ring = Ring('/etc/swift/object.ring.gz')
        attempt = 0
        while True:
            attempt += 1
            try:
                url, token = get_auth('http://127.0.0.1:8080/auth/v1.0',
                                      'test:tester', 'testing')
                account = url.split('/')[-1]
                break
            except Exception, err:
                if attempt > 9:
                    print err
                    print 'Giving up after %s retries.' % attempt
                    raise err
                print err
                print 'Retrying in 2 seconds...'
                sleep(2)
    except BaseException, err:
        kill_pids(pids)
        raise err

    def setUp(self):
        resetswift()
        try:
            self.ipport2server = {}
            self.configs = defaultdict(dict)
            self.account_ring = get_ring(
                'account',
                self.acct_cont_required_replicas,
                self.acct_cont_required_devices,
                ipport2server=self.ipport2server,
                config_paths=self.configs)
            self.container_ring = get_ring(
                'container',
                self.acct_cont_required_replicas,
                self.acct_cont_required_devices,
                ipport2server=self.ipport2server,
                config_paths=self.configs)
            self.policy = get_policy(**self.policy_requirements)
            self.object_ring = get_ring(
                self.policy.ring_name,
                self.obj_required_replicas,
                self.obj_required_devices,
                server='object',
                ipport2server=self.ipport2server,
                config_paths=self.configs)

            self.servers_per_port = any(
                int(readconf(c, section_name='object-replicator').get(
                    'servers_per_port', '0'))
                for c in self.configs['object-replicator'].values())

            Manager(['main']).start(wait=False)
            for ipport in self.ipport2server:
                check_server(ipport, self.ipport2server)
            proxy_ipport = ('127.0.0.1', 8080)
            self.ipport2server[proxy_ipport] = 'proxy'
            self.url, self.token, self.account = check_server(
                proxy_ipport, self.ipport2server)
            self.account_1 = {
                'url': self.url, 'token': self.token, 'account': self.account}

            url2, token2 = get_auth(
                'http://%s:%d/auth/v1.0' % proxy_ipport,
                'test2:tester2', 'testing2')
            self.account_2 = {
                'url': url2, 'token': token2, 'account': url2.split('/')[-1]}
            head_account(url2, token2)  # sanity check

            self.replicators = Manager(
                ['account-replicator', 'container-replicator',
                 'object-replicator'])
            self.updaters = Manager(['container-updater', 'object-updater'])
        except BaseException:
            try:
                raise
            finally:
                try:
                    Manager(['all']).kill()
                except Exception:
                    pass

 def page_login(self, req):
     """ create login page """
     if req.method == 'POST':
         try:
             username = req.params_alt().get('username')
             password = req.params_alt().get('password')
             (storage_url, token) = get_auth(self.auth_url,
                                             username, password,
                                             auth_version=self.auth_version)
             if self.token_bank.get(token, None):
                 self.token_bank[token].update({'url': storage_url,
                                                'last': int(time())})
             else:
                 self.token_bank[token] = {'url': storage_url,
                                           'last': int(time())}
             resp = HTTPFound(location=self.add_prefix(storage_url) + \
                              '?limit=%s' % self.items_per_page)
             resp.set_cookie('_token', token, path=self.page_path,
                             max_age=self.cookie_max_age,
                             secure=self.secure)
             self.memcache_update(token)
             return resp
         except Exception, err:
             lang = self.get_lang(req)
             resp = Response(charset='utf8')
             resp.app_iter = self.tmpl({'ptype': 'login',
                                        'top': self.page_path,
                                        'title': self.title, 'lang': lang,
                                        'message': 'Login Failed'})
             return resp

    def authenticate(self, clone_conn=None):
        if clone_conn:
            self.conn_class = clone_conn.conn_class
            self.storage_host = clone_conn.storage_host
            self.storage_url = clone_conn.storage_url
            self.storage_port = clone_conn.storage_port
            self.storage_token = clone_conn.storage_token
            return

        if self.auth_version == "1":
            auth_path = "%sv1.0" % (self.auth_prefix)
            if self.account:
                auth_user = "%s:%s" % (self.account, self.username)
            else:
                auth_user = self.username
        else:
            auth_user = self.username
            auth_path = self.auth_prefix
        auth_scheme = "https://" if self.auth_ssl else "http://"
        auth_netloc = "%s:%d" % (self.auth_host, self.auth_port)
        auth_url = auth_scheme + auth_netloc + auth_path

        (storage_url, storage_token) = get_auth(
            auth_url,
            auth_user,
            self.password,
            snet=False,
            tenant_name=self.account,
            auth_version=self.auth_version,
            os_options={},
        )

        if not (storage_url and storage_token):
            raise AuthenticationFailed()

        x = storage_url.split("/")

        if x[0] == "http:":
            self.conn_class = httplib.HTTPConnection
            self.storage_port = 80
        elif x[0] == "https:":
            self.conn_class = httplib.HTTPSConnection
            self.storage_port = 443
        else:
            raise ValueError("unexpected protocol %s" % (x[0]))

        self.storage_host = x[2].split(":")[0]
        if ":" in x[2]:
            self.storage_port = int(x[2].split(":")[1])
        # Make sure storage_url is a string and not unicode, since
        # keystoneclient (called by swiftclient) returns them in
        # unicode and this would cause troubles when doing
        # no_safe_quote query.
        self.storage_url = str("/%s/%s" % (x[3], x[4]))

        self.storage_token = storage_token

        self.http_connect()
        return self.storage_url, self.storage_token

	def __init__(self):
		# get URL and token to use for requests
		self.auth_info = SWIFT.get_auth('http://192.168.52.2:8080/auth/v1.0/','test:tester','testing')
		self.swift_url = self.auth_info[0]
		self.auth_token = self.auth_info[1]

		self.user = getpass.getuser()
		self.container_name = 'testdir'

def get_url_token(user_index, os_options):
    authargs = dict(
        snet=False,
        tenant_name=swift_test_tenant[user_index],
        auth_version=swift_test_auth_version,
        os_options=os_options,
        insecure=insecure,
    )
    return get_auth(swift_test_auth, swift_test_user[user_index], swift_test_key[user_index], **authargs)

    def __init__(self, logger, conf, names):
        self.logger = logger
        self.aborted = False
        self.user = conf.user
        self.key = conf.key
        self.auth_url = conf.auth
        self.use_proxy = config_true_value(conf.use_proxy)
        if not self.use_proxy and direct_client is None:
            self.logger.critical("You need to have swift installed if you are "
                                 "not using the proxy")
            sys.exit(1)
        self.auth_version = conf.auth_version
        self.logger.info("Auth version: %s" % self.auth_version)
        if self.use_proxy:
            if using_http_proxy(self.auth_url):
                logger.warn("Auth is going through HTTP proxy server. This "
                            "could affect test result")
            url, token = client.get_auth(self.auth_url, self.user, self.key,
                                         auth_version=self.auth_version)
            self.token = token
            self.account = url.split('/')[-1]
            if conf.url == '':
                self.url = url
            else:
                self.url = conf.url
        else:
            self.token = 'SlapChop!'
            self.account = conf.account
            self.url = conf.url
            self.ip, self.port = self.url.split('/')[2].split(':')

        if using_http_proxy(self.url):
            logger.warn("Communication with Swift server is going through "
                        "HTTP proxy server. This could affect test result")

        self.object_size = int(conf.object_size)
        self.object_sources = conf.object_sources
        self.lower_object_size = int(conf.lower_object_size)
        self.upper_object_size = int(conf.upper_object_size)
        self.files = []
        if self.object_sources:
            self.object_sources = self.object_sources.split()
            self.files = [file(f, 'rb').read() for f in self.object_sources]

        self.put_concurrency = int(conf.put_concurrency)
        self.get_concurrency = int(conf.get_concurrency)
        self.del_concurrency = int(conf.del_concurrency)
        self.total_objects = int(conf.num_objects)
        self.total_gets = int(conf.num_gets)
        self.timeout = int(conf.timeout)
        self.devices = conf.devices.split()
        self.names = names
        self.conn_pool = ConnectionPool(self.url,
                                        max(self.put_concurrency,
                                            self.get_concurrency,
                                            self.del_concurrency))

def retry(func, *args, **kwargs):
    """
    You can use the kwargs to override:
      'retries' (default: 5)
      'use_account' (default: 1) - which user's token to pass
      'url_account' (default: matches 'use_account') - which user's storage URL
      'resource' (default: url[url_account] - URL to connect to; retry()
          will interpolate the variable :storage_url: if present
    """
    global url, token, parsed, conn
    retries = kwargs.get('retries', 5)
    attempts, backoff = 0, 1

    # use account #1 by default; turn user's 1-indexed account into 0-indexed
    use_account = kwargs.pop('use_account', 1) - 1

    # access our own account by default
    url_account = kwargs.pop('url_account', use_account + 1) - 1
    os_options = {'user_domain_name': swift_test_domain[use_account],
                  'project_domain_name': swift_test_domain[use_account]}
    while attempts <= retries:
        attempts += 1
        try:
            if not url[use_account] or not token[use_account]:
                url[use_account], token[use_account] = \
                    get_auth(swift_test_auth, swift_test_user[use_account],
                             swift_test_key[use_account],
                             snet=False,
                             tenant_name=swift_test_tenant[use_account],
                             auth_version=swift_test_auth_version,
                             os_options=os_options)
                parsed[use_account] = conn[use_account] = None
            if not parsed[use_account] or not conn[use_account]:
                parsed[use_account], conn[use_account] = \
                    connection(url[use_account])

            # default resource is the account url[url_account]
            resource = kwargs.pop('resource', '%(storage_url)s')
            template_vars = {'storage_url': url[url_account]}
            parsed_result = urlparse(resource % template_vars)
            return func(url[url_account], token[use_account],
                        parsed_result, conn[url_account],
                        *args, **kwargs)
        except (socket.error, HTTPException):
            if attempts > retries:
                raise
            parsed[use_account] = conn[use_account] = None
        except AuthError:
            url[use_account] = token[use_account] = None
            continue
        except InternalServerError:
            pass
        if attempts <= retries:
            sleep(backoff)
            backoff *= 2
    raise Exception('No result after %s retries.' % retries)

 def get_storage_token(self):
   """ Get a storage token for the swift cluster """
   account = self.get_account_str()
   try:
     url, token = swiftclient.get_auth(self.authurl, account, self.key)
   except swiftclient.client.ClientException as e:
     raise SageFSException('HTTP Error: %s - %s' 
                % (e.http_status, e.http_reason))
   self.storeurl = url
   self.storetoken = token

 def get_token(self):
     if time() - self._token_creation_time >= self.auth_token_duration:
         new_token = swiftclient.get_auth(
             self.api_auth_url,
             self.api_username,
             self.api_key,
             auth_version=self.auth_version,
             os_options={"tenant_name": self.tenant_name})[1]
         self.token = new_token
     return self._token

    def __init__(self):
        self.last_headers_name = None
        self.last_headers_value = None

        # Get authentication token
        self.storage_url, self.token = swiftclient.get_auth(
            self.api_auth_url,
            self.api_username,
            self.api_key,
            auth_version=self.auth_version,
            os_options=dict({"tenant_name": self.tenant_name}.items() +
                            self.os_extra_options.items()),
            cacert=self.custom_ca,
            insecure=self.ssl_insecure
        )
        self.http_conn = swiftclient.http_connection(self.storage_url)

        # Check container
        try:
            swiftclient.head_container(self.storage_url, self.token,
                                       self.container_name,
                                       http_conn=self.http_conn)
        except swiftclient.ClientException:
            headers = {}
            if self.auto_create_container:
                if self.auto_create_container_public:
                    headers['X-Container-Read'] = '.r:*'
                swiftclient.put_container(self.storage_url, self.token,
                                          self.container_name,
                                          http_conn=self.http_conn,
                                          headers=headers)
            else:
                raise ImproperlyConfigured(
                    "Container %s does not exist." % self.container_name)

        if self.auto_base_url:
            # Derive a base URL based on the authentication information from
            # the server, optionally overriding the protocol, host/port and
            # potentially adding a path fragment before the auth information.
            self.base_url = self.storage_url + '/'
            if self.override_base_url is not None:
                # override the protocol and host, append any path fragments
                split_derived = urlparse.urlsplit(self.base_url)
                split_override = urlparse.urlsplit(self.override_base_url)
                split_result = [''] * 5
                split_result[0:2] = split_override[0:2]
                split_result[2] = (split_override[2] +
                                   split_derived[2]).replace('//', '/')
                self.base_url = urlparse.urlunsplit(split_result)

            self.base_url = urlparse.urljoin(self.base_url,
                                             self.container_name)
            self.base_url += '/'
        else:
            self.base_url = self.override_base_url

    def __init__(self, **settings):
        # check if some of the settings provided as class attributes
        # should be overwritten
        for name, value in settings.items():
            if hasattr(self, name):
                setattr(self, name, value)

        self.last_headers_name = None
        self.last_headers_value = None

        # Get authentication token
        self.storage_url, self.token = swiftclient.get_auth(
            self.api_auth_url,
            self.api_username,
            self.api_key,
            auth_version=self.auth_version,
            os_options={"tenant_name": self.tenant_name},
        )
        self.http_conn = swiftclient.http_connection(self.storage_url)

        # Check container
        try:
            swiftclient.head_container(self.storage_url, self.token,
                                       self.container_name,
                                       http_conn=self.http_conn)
        except swiftclient.ClientException:
            if self.auto_create_container:
                swiftclient.put_container(self.storage_url, self.token,
                                          self.container_name,
                                          http_conn=self.http_conn)
            else:
                raise ImproperlyConfigured(
                    "Container %s does not exist." % self.container_name)

        if self.auto_base_url:
            # Derive a base URL based on the authentication information from
            # the server, optionally overriding the protocol, host/port and
            # potentially adding a path fragment before the auth information.
            self.base_url = self.storage_url + '/'
            if self.override_base_url is not None:
                # override the protocol and host, append any path fragments
                split_derived = urlparse.urlsplit(self.base_url)
                split_override = urlparse.urlsplit(self.override_base_url)
                split_result = [''] * 5
                split_result[0:2] = split_override[0:2]
                split_result[2] = (split_override[2] +
                                   split_derived[2]).replace('//', '/')
                self.base_url = urlparse.urlunsplit(split_result)

            self.base_url = urlparse.urljoin(self.base_url,
                                             self.container_name)
            self.base_url += '/'
        else:
            self.base_url = self.override_base_url

def get_auth_token():
    """
    Get Authenticate token and Storage URL

    Returns:
    (token, storage_url)
    """
    auth_url = "http://%s:8080/auth/v1.0" % PROXY_IP
    url, token = client.get_auth(auth_url,
                                 ':'.join((ACCOUNT, USER)),
                                 KEY)
    return (token, url)

    def authenticate(self, clone_conn=None):
        if clone_conn:
            self.conn_class = clone_conn.conn_class
            self.storage_host = clone_conn.storage_host
            self.storage_url = clone_conn.storage_url
            self.storage_port = clone_conn.storage_port
            self.storage_token = clone_conn.storage_token
            return

        if self.auth_version == "1":
            auth_path = '%sv1.0' % (self.auth_prefix)
            if self.account:
                auth_user = '%s:%s' % (self.account, self.username)
            else:
                auth_user = self.username
        else:
            auth_user = self.username
            auth_path = self.auth_prefix
        auth_scheme = 'https://' if self.auth_ssl else 'http://'
        auth_netloc = "%s:%d" % (self.auth_host, self.auth_port)
        auth_url = auth_scheme + auth_netloc + auth_path

        (storage_url, storage_token) = get_auth(auth_url,
              auth_user, self.password,
              snet=False,
              tenant_name=self.account,
              auth_version=self.auth_version,
              os_options={})

        if not (storage_url and storage_token):
            raise AuthenticationFailed()

        x = storage_url.split('/')

        if x[0] == 'http:':
            self.conn_class = httplib.HTTPConnection
            self.storage_port = 80
        elif x[0] == 'https:':
            self.conn_class = httplib.HTTPSConnection
            self.storage_port = 443
        else:
            raise ValueError('unexpected protocol %s' % (x[0]))

        self.storage_host = x[2].split(':')[0]
        if ':' in x[2]:
            self.storage_port = int(x[2].split(':')[1])
        self.storage_url = '/%s/%s' % (x[3], x[4])

        self.storage_token = storage_token

        self.http_connect()
        return self.storage_url, self.storage_token

    def _get_auth(self, user_name):
        info = self.users.get(user_name)
        if info is None:
            return None, None

        os_options = {"user_domain_name": info["domain"], "project_domain_name": info["domain"]}
        authargs = dict(
            snet=False,
            tenant_name=info["account"],
            auth_version=self.auth_version,
            os_options=os_options,
            insecure=self.insecure,
        )
        storage_url, token = get_auth(self.auth_url, user_name, info["password"], **authargs)

        return storage_url, token

    def __init__(self, logger, conf, names):
        self.logger = logger
        self.aborted = False
        self.user = conf.user
        self.key = conf.key
        self.auth_url = conf.auth
        self.use_proxy = conf.use_proxy.lower() in TRUE_VALUES
        self.auth_version = conf.auth_version
        self.logger.info("Auth version: %s" % self.auth_version)
        if self.use_proxy:
            url, token = client.get_auth(self.auth_url, self.user, self.key,
                                         auth_version=self.auth_version)
            self.token = token
            self.account = url.split('/')[-1]
            if conf.url == '':
                self.url = url
            else:
                self.url = conf.url
        else:
            self.token = 'SlapChop!'
            self.account = conf.account
            self.url = conf.url
            self.ip, self.port = self.url.split('/')[2].split(':')
        self.containers = ['%s_%d' % (conf.container_name, i)
            for i in xrange(int(conf.num_containers))]

        self.object_size = int(conf.object_size)
        self.object_sources = conf.object_sources
        self.lower_object_size = int(conf.lower_object_size)
        self.upper_object_size = int(conf.upper_object_size)
        self.files = []
        if self.object_sources:
            self.object_sources = self.object_sources.split()
            self.files = [file(f, 'rb').read() for f in self.object_sources]

        self.put_concurrency = int(conf.put_concurrency)
        self.get_concurrency = int(conf.get_concurrency)
        self.del_concurrency = int(conf.del_concurrency)
        self.total_objects = int(conf.num_objects)
        self.total_gets = int(conf.num_gets)
        self.timeout = int(conf.timeout)
        self.devices = conf.devices.split()
        self.names = names
        self.conn_pool = ConnectionPool(self.url,
            max(self.put_concurrency, self.get_concurrency,
                self.del_concurrency))

def retry(func, *args, **kwargs):
    """
    You can use the kwargs to override the 'retries' (default: 5) and
    'use_account' (default: 1).
    """
    global url, token, parsed, conn
    retries = kwargs.get('retries', 5)
    use_account = 1
    if 'use_account' in kwargs:
        use_account = kwargs['use_account']
        del kwargs['use_account']
    use_account -= 1
    attempts = 0
    backoff = 1
    while attempts <= retries:
        attempts += 1
        try:
            if not url[use_account] or not token[use_account]:
                url[use_account], token[use_account] = \
                    get_auth(swift_test_auth, swift_test_user[use_account],
                             swift_test_key[use_account],
                             snet=False,
                             tenant_name=swift_test_tenant[use_account],
                             auth_version=swift_test_auth_version,
                             os_options={})
                parsed[use_account] = conn[use_account] = None
            if not parsed[use_account] or not conn[use_account]:
                parsed[use_account], conn[use_account] = \
                    http_connection(url[use_account])
            return func(url[use_account], token[use_account],
                        parsed[use_account], conn[use_account],
                        *args, **kwargs)
        except (socket.error, HTTPException):
            if attempts > retries:
                raise
            parsed[use_account] = conn[use_account] = None
        except AuthError:
            url[use_account] = token[use_account] = None
            continue
        except InternalServerError:
            pass
        if attempts <= retries:
            sleep(backoff)
            backoff *= 2
    raise Exception('No result after %s retries.' % retries)

def check_server(port, port2server, pids, timeout=CHECK_SERVER_TIMEOUT):
    server = port2server[port]
    if server[:-1] in ('account', 'container', 'object'):
        if int(server[-1]) > 4:
            return None
        path = '/connect/1/2'
        if server[:-1] == 'container':
            path += '/3'
        elif server[:-1] == 'object':
            path += '/3/4'
        try_until = time() + timeout
        while True:
            try:
                conn = HTTPConnection('127.0.0.1', port)
                conn.request('GET', path)
                resp = conn.getresponse()
                # 404 because it's a nonsense path (and mount_check is false)
                # 507 in case the test target is a VM using mount_check
                if resp.status not in (404, 507):
                    raise Exception(
                        'Unexpected status %s' % resp.status)
                break
            except Exception as err:
                if time() > try_until:
                    print err
                    print 'Giving up on %s:%s after %s seconds.' % (
                        server, port, timeout)
                    raise err
                sleep(0.1)
    else:
        try_until = time() + timeout
        while True:
            try:
                url, token = get_auth('http://127.0.0.1:8080/auth/v1.0',
                                      'test:tester', 'testing')
                account = url.split('/')[-1]
                head_account(url, token)
                return url, token, account
            except Exception as err:
                if time() > try_until:
                    print err
                    print 'Giving up on proxy:8080 after 30 seconds.'
                    raise err
                sleep(0.1)
    return None