Beispiel #1
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def learn_cache_key(request, response, tags=(), cache_timeout=None, key_prefix=None, cache=None):  # patched
    """
    Learns what headers to take into account for some request path from the
    response object. It stores those headers in a global path registry so that
    later access to that path will know what headers to take into account
    without building the response object itself. The headers are named in the
    Vary header of the response, but we want to prevent response generation.

    The list of headers to use for cache key generation is stored in the same
    cache as the pages themselves. If the cache ages some data out of the
    cache, this just means that we have to build the response once to get at
    the Vary header and so at the list of headers to use for the cache key.
    """
    if key_prefix is None:
        key_prefix = settings.CACHE_MIDDLEWARE_KEY_PREFIX
    if cache_timeout is None:
        cache_timeout = settings.CACHE_MIDDLEWARE_SECONDS
    cache_key = _generate_cache_header_key(key_prefix, request)
    if cache is None:
        cache = get_cache(settings.CACHE_MIDDLEWARE_ALIAS)
    if response.has_header('Vary'):
        headerlist = ['HTTP_'+header.upper().replace('-', '_')
                      for header in cc_delim_re.split(response['Vary'])]
        cache.set(cache_key, headerlist, tags, cache_timeout)  # patched
        return _generate_cache_key(request, request.method, headerlist, key_prefix)
    else:
        # if there is no Vary header, we still need a cache key
        # for the request.get_full_path()
        cache.set(cache_key, [], tags, cache_timeout)  # patched
        return _generate_cache_key(request, request.method, [], key_prefix)
Beispiel #2
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 def warmup_cache(self):
     cache = get_cache(settings.CACHE_MIDDLEWARE_ALIAS)
     cache_header_key = _generate_cache_header_key(settings.CACHE_MIDDLEWARE_KEY_PREFIX, self.request)
     cache.set(cache_header_key, 'header dummy cache', 30)
     cache_key = get_cache_key(self.request,
                               settings.CACHE_MIDDLEWARE_KEY_PREFIX, 'GET',
                               cache=cache)
     cache.set(cache_key, self.RESPONSE_CACHED_VALUE, 30)
Beispiel #3
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def set_cached_data(request, key_prefix, data):
    """Function to save data to the cache based on the request."""

    cache_header_key = _generate_cache_header_key(key_prefix, request)
    if cache.get(cache_header_key) is None:
        cache.set(cache_header_key, [], None)

    cache_key = get_cache_key(request, key_prefix)
    cache.set(cache_key, data)
Beispiel #4
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def set_cached_data(request, key_prefix, data):
    """Function to save data to the cache based on the request."""

    cache_header_key = _generate_cache_header_key(key_prefix, request)
    if cache.get(cache_header_key) is None:
        cache.set(cache_header_key, [], None)

    cache_key = get_cache_key(request, key_prefix)
    cache.set(cache_key, data)
Beispiel #5
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 def invalidate_cached_entry(self):
     url = urlparse(self.get_absolute_url())
     rf = RequestFactory(SERVER_NAME=url.netloc, HTTP_X_FORWARDED_PROTOCOL=url.scheme)
     is_secure = url.scheme == "https"
     request = rf.get(url.path, secure=is_secure)
     request.LANGUAGE_CODE = "en"
     cache = caches[settings.CACHE_MIDDLEWARE_ALIAS]
     cache_key = _generate_cache_header_key(settings.CACHE_MIDDLEWARE_KEY_PREFIX, request)
     cache.delete(cache_key)
Beispiel #6
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def _custom_vary_on(report):
    """
    signature is intentionally restricted to a single argument
    to prevent @request_cache() from decorating a method that has non-self args
    """
    return [
        _generate_cache_header_key(CACHE_PREFIX, report.request),
        report.request.domain,
        report.request.couch_user._id,
    ]
Beispiel #7
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def _custom_vary_on(report):
    """
    signature is intentionally restricted to a single argument
    to prevent @request_cache() from decorating a method that has non-self args
    """
    return [
        _generate_cache_header_key(CACHE_PREFIX, report.request),
        report.request.domain,
        report.request.couch_user._id,
    ]
Beispiel #8
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def get_orderless_cache_key(request, key_prefix=None, method='GET', cache=None):
    if key_prefix is None:
        key_prefix = settings.CACHE_MIDDLEWARE_KEY_PREFIX
    cache_key = _generate_cache_header_key(key_prefix, request)
    if cache is None:
        cache = caches[settings.CACHE_MIDDLEWARE_ALIAS]
    headerlist = cache.get(cache_key, None)
    if headerlist is not None:
        return _generate_orderless_cache_key(request, method, headerlist, key_prefix)
    else:
        return None
Beispiel #9
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def get_orderless_cache_key(request, key_prefix=None, method='GET', cache=None):
    if key_prefix is None:
        key_prefix = settings.CACHE_MIDDLEWARE_KEY_PREFIX
    cache_key = _generate_cache_header_key(key_prefix, request)
    if cache is None:
        cache = caches[settings.CACHE_MIDDLEWARE_ALIAS]
    headerlist = cache.get(cache_key, None)
    if headerlist is not None:
        return _generate_orderless_cache_key(request, method, headerlist, key_prefix)
    else:
        return None
Beispiel #10
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def get_cache_key_parameters(request):
    result = []
    key_prefix = settings.CACHE_MIDDLEWARE_KEY_PREFIX
    result.append("key_prefix: %s" % key_prefix)
    cache_key = _generate_cache_header_key(key_prefix, request)
    headerlist = cache.get(cache_key, None)
    if headerlist:
        for header in headerlist:
            value = request.META.get(header, None)
            if value is not None:
                result.append("%s = %s" % (header, value))
    return result
Beispiel #11
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 def invalidate_cached_entry(self):
     url = urlparse(self.get_absolute_url())
     rf = RequestFactory(
         SERVER_NAME=url.netloc,
         HTTP_X_FORWARDED_PROTOCOL=url.scheme,
     )
     is_secure = url.scheme == 'https'
     request = rf.get(url.path, secure=is_secure)
     request.LANGUAGE_CODE = 'en'
     cache = caches[settings.CACHE_MIDDLEWARE_ALIAS]
     cache_key = _generate_cache_header_key(settings.CACHE_MIDDLEWARE_KEY_PREFIX, request)
     cache.delete(cache_key)
Beispiel #12
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 def test_update_cache(self):
     cache = get_cache(settings.CACHE_MIDDLEWARE_ALIAS)
     cache.clear()
     request = RequestFactory().get('/')
     cache_header_key = _generate_cache_header_key(settings.CACHE_MIDDLEWARE_KEY_PREFIX, request)
     cache.set(cache_header_key, 'header dummy cache', 30)
     cache_key = get_cache_key(request,
                               settings.CACHE_MIDDLEWARE_KEY_PREFIX, 'GET',
                               cache=cache)
     self.assertEqual(cache.get(cache_key), None, 'Cache is empty')
     update_cache('/')
     self.assertNotEqual(cache.get(cache_key), None, 'Cache is not empty')
Beispiel #13
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def get_cached_data(request, key_prefix, data, serializer):
    """Function to get serialized data from the cache based on the request."""
    cache_header_key = _generate_cache_header_key(key_prefix, request)
    if cache.get(cache_header_key) is None:
        cache.set(cache_header_key, [], None)

    cache_key = get_cache_key(request, key_prefix)
    cached_data = cache.get(cache_key, None)
    cache_used = True
    if not cached_data and data is not None:
        cache_used = False
        cached_data = serializer(data, many=True).data
        cache.set(cache_key, cached_data)

    return cached_data, cache_used
Beispiel #14
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def get_cached_data(request, key_prefix, data, serializer):
    """Function to get serialized data from the cache based on the request."""
    cache_header_key = _generate_cache_header_key(key_prefix, request)
    if cache.get(cache_header_key) is None:
        cache.set(cache_header_key, [], None)

    cache_key = get_cache_key(request, key_prefix)
    cached_data = cache.get(cache_key, None)
    cache_used = True
    if not cached_data and data is not None:
        cache_used = False
        cached_data = serializer(data, many=True).data
        cache.set(cache_key, cached_data)

    return cached_data, cache_used
    def handle(self, *args, **options):
        # Deletes hard-wired 'main_results_table' fragment from main results
        args = hashlib.md5(u':'.join([urlquote(u'')]))
        cache_key = 'template.cache.%s.%s' % ('main_results_table', args.hexdigest())
        self.stdout.write(u'Was there a page fragment cache? {0}\n'.format(cache.has_key(cache_key)))
        cache.delete(cache_key)
        self.stdout.write(u'Cleared the main_results_table fragment!\n')

        # Hard-wire delete of page URL /ballot/results/full/
        request = HttpRequest()
        key_prefix = ''
        request.path = '/ballot/results/full/'
        key = _generate_cache_header_key(key_prefix, request)
        self.stdout.write(u'Was there a URL cache? {0}\n'.format(cache.has_key(key)))
        cache.set(key, None, 0)
        self.stdout.write(u'Cleared the /ballot/results/full/ URL!\n')
Beispiel #16
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def learn_cache_key(request,
                    response,
                    tags=(),
                    cache_timeout=None,
                    key_prefix=None,
                    cache=None):  # patched
    """
    Learns what headers to take into account for some request URL from the
    response object. It stores those headers in a global URL registry so that
    later access to that URL will know what headers to take into account
    without building the response object itself. The headers are named in the
    Vary header of the response, but we want to prevent response generation.

    The list of headers to use for cache key generation is stored in the same
    cache as the pages themselves. If the cache ages some data out of the
    cache, this just means that we have to build the response once to get at
    the Vary header and so at the list of headers to use for the cache key.
    """
    if key_prefix is None:
        key_prefix = settings.CACHE_MIDDLEWARE_KEY_PREFIX
    if cache_timeout is None:
        cache_timeout = settings.CACHE_MIDDLEWARE_SECONDS
    cache_key = _generate_cache_header_key(key_prefix, request)
    if cache is None:
        cache = caches[settings.CACHE_MIDDLEWARE_ALIAS]
    if response.has_header('Vary'):
        is_accept_language_redundant = settings.USE_I18N or settings.USE_L10N
        # If i18n or l10n are used, the generated cache key will be suffixed
        # with the current locale. Adding the raw value of Accept-Language is
        # redundant in that case and would result in storing the same content
        # under multiple keys in the cache. See #18191 for details.
        headerlist = []
        for header in cc_delim_re.split(response['Vary']):
            header = header.upper().replace('-', '_')
            if header == 'ACCEPT_LANGUAGE' and is_accept_language_redundant:
                continue
            headerlist.append('HTTP_' + header)
        headerlist.sort()
        cache.set(cache_key, headerlist, tags, cache_timeout)  # patched
        return _generate_cache_key(request, request.method, headerlist,
                                   key_prefix)
    else:
        # if there is no Vary header, we still need a cache key
        # for the request.build_absolute_uri()
        cache.set(cache_key, [], tags, cache_timeout)  # patched
        return _generate_cache_key(request, request.method, [], key_prefix)
Beispiel #17
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def add_page_cache(request, group='default', key_prefix=None):
    """增加视图缓存key,清除缓存时使用,不支持reponse has_header 'Vary'"""
    group = group or 'page'
    page_cache = _page_cache_dict()
    if group not in page_cache:
        page_cache[group] = {}

    if request.get_full_path() in page_cache[group]:
        return

    if key_prefix is None:
        key_prefix = settings.CACHE_MIDDLEWARE_KEY_PREFIX
    headerkey = _generate_cache_header_key(key_prefix, request)
    cachekey = _generate_cache_key(request, request.method, [], key_prefix)
    page_cache[group][request.get_full_path()] = {
        'header': headerkey,
        'cache': cachekey,
    }
    _save_page_cache(page_cache)
Beispiel #18
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def learn_orderless_cache_key(request, response, cache_timeout=None, key_prefix=None, cache=None):
    """
    Learns what headers to take into account for some request URL from the
    response object. It stores those headers in a global URL registry so that
    later access to that URL will know what headers to take into account
    without building the response object itself. The headers are named in the
    Vary header of the response, but we want to prevent response generation.

    The list of headers to use for cache key generation is stored in the same
    cache as the pages themselves. If the cache ages some data out of the
    cache, this just means that we have to build the response once to get at
    the Vary header and so at the list of headers to use for the cache key.
    """
    if key_prefix is None:
        key_prefix = settings.CACHE_MIDDLEWARE_KEY_PREFIX
    if cache_timeout is None:
        cache_timeout = settings.CACHE_MIDDLEWARE_SECONDS
    cache_key = _generate_cache_header_key(key_prefix, request)
    if cache is None:
        cache = caches[settings.CACHE_MIDDLEWARE_ALIAS]
    if response.has_header('Vary'):
        is_accept_language_redundant = settings.USE_I18N or settings.USE_L10N
        # If i18n or l10n are used, the generated cache key will be suffixed
        # with the current locale. Adding the raw value of Accept-Language is
        # redundant in that case and would result in storing the same content
        # under multiple keys in the cache. See #18191 for details.
        headerlist = []
        for header in cc_delim_re.split(response['Vary']):
            header = header.upper().replace('-', '_')
            if header == 'ACCEPT_LANGUAGE' and is_accept_language_redundant:
                continue
            headerlist.append('HTTP_' + header)
        headerlist.sort()
        cache.set(cache_key, headerlist, cache_timeout)
        return _generate_orderless_cache_key(request, request.method, headerlist, key_prefix)
    else:
        # if there is no Vary header, we still need a cache key
        # for the request.build_absolute_uri()
        cache.set(cache_key, [], cache_timeout)
        return _generate_orderless_cache_key(request, request.method, [], key_prefix)
Beispiel #19
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def learn_cache_key(request,
                    response,
                    tags=(),
                    cache_timeout=None,
                    key_prefix=None,
                    cache=None):  # patched
    """
    Learns what headers to take into account for some request path from the
    response object. It stores those headers in a global path registry so that
    later access to that path will know what headers to take into account
    without building the response object itself. The headers are named in the
    Vary header of the response, but we want to prevent response generation.

    The list of headers to use for cache key generation is stored in the same
    cache as the pages themselves. If the cache ages some data out of the
    cache, this just means that we have to build the response once to get at
    the Vary header and so at the list of headers to use for the cache key.
    """
    if key_prefix is None:
        key_prefix = settings.CACHE_MIDDLEWARE_KEY_PREFIX
    if cache_timeout is None:
        cache_timeout = settings.CACHE_MIDDLEWARE_SECONDS
    cache_key = _generate_cache_header_key(key_prefix, request)
    if cache is None:
        cache = get_cache(settings.CACHE_MIDDLEWARE_ALIAS)
    if response.has_header('Vary'):
        headerlist = [
            'HTTP_' + header.upper().replace('-', '_')
            for header in cc_delim_re.split(response['Vary'])
        ]
        cache.set(cache_key, headerlist, tags, cache_timeout)  # patched
        return _generate_cache_key(request, request.method, headerlist,
                                   key_prefix)
    else:
        # if there is no Vary header, we still need a cache key
        # for the request.get_full_path()
        cache.set(cache_key, [], tags, cache_timeout)  # patched
        return _generate_cache_key(request, request.method, [], key_prefix)
Beispiel #20
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def invalidate_cache_for_path(request_path):
    """ invalidates cache based on request.path """

    # use a dummy request object so we can call django's _generate_cache_header_key
    class Request(object):

        def __init__(self, request_path):
            self.request_path = request_path

        def get_full_path(self):
            return self.request_path

    request = Request(request_path)
    cache_header_key = _generate_cache_header_key(settings.CACHE_MIDDLEWARE_KEY_PREFIX, request)

    # cache must be invalidated for all available languages
    if settings.USE_I18N:
        base_key = cache_header_key[:cache_header_key.rfind('.')]
        for code, name in settings.LANGUAGES:
            key = "%s.%s" % (base_key, code)
            cache.delete(key)
    else:
        cache.delete(cache_header_key)
Beispiel #21
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 def save(self, *args, **kwargs):
     # Code Smell; hard-wiring these URLs for clearing view caches on save()
     # Better way ('cept for maybe the signal part ... ):
     # http://stackoverflow.com/questions/2268417/expire-a-view-cache-in-django
     request = HttpRequest()
     key_prefix = ''
     
     json_views = (
         '/ballot/json/',
         '/ballot/json/eugspr/',
         '/ballot/json/laneco/',
         '/ballot/json/region/',
         '/ballot/json/laneme/',
         '/ballot/json/stater/',
         '/ballot/json/statem/',
         '/ballot/json/topset/',
      )
     for json_view in json_views:
         request.path = json_view
         key = _generate_cache_header_key(key_prefix, request)
         if cache.has_key(key):
             cache.set(key, None, 0)
     super(CCOnSaveBase, self).save(*args, **kwargs)
Beispiel #22
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def invalidate_cache_for_path(request_path):
    """ invalidates cache based on request.path """

    # use a dummy request object so we can call django's _generate_cache_header_key
    class Request(object):
        def __init__(self, request_path):
            self.request_path = request_path

        def get_full_path(self):
            return self.request_path

    request = Request(request_path)
    cache_header_key = _generate_cache_header_key(
        settings.CACHE_MIDDLEWARE_KEY_PREFIX, request)

    # cache must be invalidated for all available languages
    if settings.USE_I18N:
        base_key = cache_header_key[:cache_header_key.rfind('.')]
        for code, name in settings.LANGUAGES:
            key = "%s.%s" % (base_key, code)
            cache.delete(key)
    else:
        cache.delete(cache_header_key)
Beispiel #23
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    def process_request(self, request):
        """
        Checks whether the page is already cached and returns the cached
        version if available.
        """
        if self.cache_anonymous_only:
            assert hasattr(
                request, "user"
            ), "The Django cache middleware with CACHE_MIDDLEWARE_ANONYMOUS_ONLY=True requires authentication middleware to be installed. Edit your MIDDLEWARE_CLASSES setting to insert 'django.contrib.auth.middleware.AuthenticationMiddleware' before the CacheMiddleware."

        # we define these attributes for a possible later use in views
        request.path_cache_key = _generate_cache_header_key(self.key_prefix, request)
        request.cache_query_string = self.cache_query_string

        if not request.method in ("GET", "HEAD") or (request.GET and not self.cache_query_string):
            request._cache_update_cache = False
            return None  # Don't bother checking the cache.

        if self.cache_anonymous_only and request.user.is_authenticated():
            request._cache_update_cache = False
            return None  # Don't cache requests from authenticated users.

        cache_key = get_request_cache_key(request, self.key_prefix)

        if cache_key is None:
            request._cache_update_cache = True
            return None  # No cache information available, need to rebuild.

        cache_key = add_suffix_to_cache_key(cache_key, request, cache_query_string=self.cache_query_string)

        response = cache.get(cache_key, None)
        if response is None:
            request._cache_update_cache = True
            return None  # No cache information available, need to rebuild.

        request._cache_update_cache = False
        return response
Beispiel #24
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def expire_cache(path, args=[], GET={}, HOSTNAME="127.0.0.1:8000", cache_name=None, isview=True, lang_code=None, method='GET'):
    if cache_name is None:
        cache_name = DEFAULT_CACHE_ALIAS
    cache = get_cache(cache_name)
    key_prefix = settings.CACHE_MIDDLEWARE_KEY_PREFIX
    print(key_prefix)
    request = HttpRequest()
    fake_meta = {'HTTP_HOST':HOSTNAME,}
    print(fake_meta['HTTP_HOST'])
    request.META = fake_meta
    request.GET = GET
    if isview:
        request.path = reverse(path, args=args)
    else:
        request.path = path

    language_code = lang_code or getattr(settings, 'LANGUAGE_CODE')
    if language_code:
        request.LANGUAGE_CODE = language_code

    header_key = _generate_cache_header_key(key_prefix, request)

    if not header_key:
        return False

    print(header_key)
    headerlist = cache.get(header_key, None)
    print(headerlist)
    if headerlist is not None:
        cache.set(header_key, None, 0)
        page_key = _generate_cache_key(request, method, headerlist, key_prefix)

        if not page_key:
            return False
        print(cache.get(page_key))
        cache.set(page_key, None, 0)
    return True
Beispiel #25
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def get_request_cache_key(request, key_prefix=None):
    """
    Based on django.utils.cache.get_cache_key function

    Returns a cache key based on the request path. It can be used in the
    request phase because it pulls the list of headers to take into account
    from the global path registry and uses those to build a cache key to check
    against.

    If there is no headerlist stored, the page needs to be rebuilt, so this
    function returns None.

    This function has been refactored to be able to call get_view_cache_key
    in a separately way. This is needed to define a request.path_cache_key
    attribute (see cmsutils.middleware.I18NFetchFromCacheMiddleware).
    """
    if key_prefix is None:
        key_prefix = settings.CACHE_MIDDLEWARE_KEY_PREFIX
    cache_key = _generate_cache_header_key(key_prefix, request)
    headerlist = cache.get(cache_key, None)
    if headerlist is not None:
        return _generate_cache_key(request, headerlist, key_prefix)
    else:
        return None
Beispiel #26
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 def cache_key(self):
     # went source diving for this in django, it does exactly
     # what we want here, though is marked 'private'. seemed
     # better to import than to copy it and all dependencies
     # elsewhere
     return _generate_cache_header_key(self.CACHE_PREFIX, self.request)
Beispiel #27
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 def cache_key(self):
     # went source diving for this in django, it does exactly
     # what we want here, though is marked 'private'. seemed
     # better to import than to copy it and all dependencies
     # elsewhere
     return _generate_cache_header_key(self.CACHE_PREFIX, self.request)
def debug(request):
    '''
    created to debug code

    Args:
        request: 
    '''
    UKCL = request.GET["UKCL"]
    return HttpResponse("OK: " + UKCL)
    try:
        from django.core import management
        #         management.call_command('migrate', "--database=materialized", interactive=False)
        #         management.call_command('migrate', 'ap', interactive=False)
        #         management.call_command('migrate', interactive=False)
        management.call_command('migrate', 'ap', interactive=False)
        # funziona?        management.call_command('migrate', "knowledge_server 0003_initial_data --database=materialized", interactive=False)
        return HttpResponse("OK")

        import scrapy

        class DmozItem(scrapy.Item):
            title = scrapy.Field()
            link = scrapy.Field()
            desc = scrapy.Field()

        class DmozSpider(scrapy.Spider):
            name = "dmoz"
            allowed_domains = ["dmoz.org"]
            start_urls = [
                "http://www.dmoz.org/Computers/Programming/Languages/Python/",
            ]

            def parse(self, response):
                for href in response.css(
                        "ul.directory.dir-col > li > a::attr('href')"):
                    url = response.urljoin(href.extract())
                    yield scrapy.Request(url, callback=self.parse_dir_contents)

            def parse_dir_contents(self, response):
                for sel in response.xpath('//ul/li'):
                    item = DmozItem()
                    item['title'] = sel.xpath('a/text()').extract()
                    item['link'] = sel.xpath('a/@href').extract()
                    item['desc'] = sel.xpath('text()').extract()
                    yield item

        return HttpResponse('OK')

        ar = ApiResponse()
        ar.content = {"DataSet": "Versions"}
        ar.status = ApiResponse.success
        return HttpResponse(ar.json(), content_type="application/json")

        # TODO: AGGIORNARE SU STACKOVERFLOW: http://stackoverflow.com/questions/8784400/clearing-specific-cache-in-django

        from licenses.models import License
        db_alias = 'default'
        ccbysa40 = License.objects.using(db_alias).get(
            short_name="CC-BY-SA-4.0")
        dssModelMetadataFields = DataSetStructure.get_from_name(
            DataSetStructure.model_metadata_DSN, db_alias)
        dssDataSetStructureStructureNode = DataSetStructure.get_from_name(
            DataSetStructure.dataset_structure_DSN, db_alias)
        dssOrganizationKS = DataSetStructure.get_from_name(
            DataSetStructure.organization_DSN, db_alias)
        for ds in DataSet.objects.using(db_alias).filter(
                dataset_structure=dssModelMetadataFields):
            ds.licenses.add(ccbysa40)
            ds.save()
        for ds in DataSet.objects.using(db_alias).filter(
                dataset_structure=dssDataSetStructureStructureNode):
            ds.licenses.add(ccbysa40)
            ds.save()
        for ds in DataSet.objects.using(db_alias).filter(
                dataset_structure=dssOrganizationKS):
            ds.licenses.add(ccbysa40)
            ds.save()
        db_alias = 'materialized'
        ccbysa40 = License.objects.using(db_alias).get(
            short_name="CC-BY-SA-4.0")
        dssModelMetadataFields = DataSetStructure.get_from_name(
            DataSetStructure.model_metadata_DSN, db_alias)
        dssDataSetStructureStructureNode = DataSetStructure.get_from_name(
            DataSetStructure.dataset_structure_DSN, db_alias)
        dssOrganizationKS = DataSetStructure.get_from_name(
            DataSetStructure.organization_DSN, db_alias)
        for ds in DataSet.objects.using(db_alias).filter(
                dataset_structure=dssModelMetadataFields):
            ds.licenses.add(ccbysa40)
            ds.save()
        for ds in DataSet.objects.using(db_alias).filter(
                dataset_structure=dssDataSetStructureStructureNode):
            ds.licenses.add(ccbysa40)
            ds.save()
        for ds in DataSet.objects.using(db_alias).filter(
                dataset_structure=dssOrganizationKS):
            ds.licenses.add(ccbysa40)
            ds.save()
        return HttpResponse("OK ")

        from django.core.cache import cache
        from django.utils.cache import get_cache_key, _generate_cache_header_key
        from django.utils.encoding import escape_uri_path
        from django.http import HttpRequest

        new_request = HttpRequest()
        new_request.path = 'root.beta.thekoa.org/oks/api/ks_info/JSON/'  ##this path works
        new_request.META['SERVER_PORT'] = request.META['SERVER_PORT']
        new_request.META['SERVER_NAME'] = request.META['SERVER_NAME']

        key = _generate_cache_header_key("", new_request)
        if cache.has_key(key):
            cache.delete(key)

        full_path = 'http://root.beta.thekoa.org/oks/api/datasets/http%253A%252F%252Froot.beta.thekoa.org%252Fknowledge_server%252FDataSetStructure%252F4/JSON/'
        import hashlib
        from django.utils.encoding import force_bytes, iri_to_uri
        from django.utils.cache import _i18n_cache_key_suffix
        # code from _generate_cache_header_key
        url = hashlib.md5(force_bytes(iri_to_uri(full_path)))
        cache_key = 'views.decorators.cache.cache_header.%s.%s' % (
            "", url.hexdigest())
        key = _i18n_cache_key_suffix(request, cache_key)
        if cache.has_key(key):
            cache.delete(key)

        return HttpResponse("OK ")
        #         d = DataSet.objects.get(pk=1)
        #         s = d.shallow_structure()
        #         rct = d.root_content_type
        #
        #
        #         for structure_child_node in s.root_node.child_nodes.all():
        #             mm = structure_child_node.sn_model_metadata(d)
        #             print(mm.name)

        dssContinentState = DataSetStructure()
        dssContinentState.name = "Test Continent-SubContinent-State"
        dssContinentState.SetNotNullFields()
        dssContinentState.save()

        return HttpResponse("OK ")
    except Exception as ex:
        logger.error("views.debug: " + str(ex))
        return HttpResponse(str(ex))