Python FileSystemCache.delete方法代码示例

# 需要导入模块: from werkzeug.contrib.cache import FileSystemCache [as 别名]
# 或者: from werkzeug.contrib.cache.FileSystemCache import delete [as 别名]
class FileSystemSessionInterface(SessionInterface):
    """Uses the :class:`werkzeug.contrib.cache.FileSystemCache` as a session
    backend.

    :param cache_dir: the directory where session files are stored.
    :param threshold: the maximum number of items the session stores before it
                      starts deleting some.
    :param mode: the file mode wanted for the session files, default 0600
    :param key_prefix: A prefix that is added to FileSystemCache store keys.
    """

    session_class = FileSystemSession

    def __init__(self, cache_dir, threshold, mode, key_prefix):
        from werkzeug.contrib.cache import FileSystemCache
        self.cache = FileSystemCache(cache_dir, threshold=threshold, mode=mode)
        self.key_prefix = key_prefix

    def _generate_sid(self):
        return str(uuid4())

    def open_session(self, app, request):
        sid = request.cookies.get(app.session_cookie_name)
        if not sid:
            sid = self._generate_sid()
            return self.session_class(sid=sid)
        data = self.cache.get(self.key_prefix + sid)
        if data is not None:
            return self.session_class(data, sid=sid)
        return self.session_class(sid=sid)
    
    def save_session(self, app, session, response):
        domain = self.get_cookie_domain(app)
        path = self.get_cookie_path(app)
        if not session:
            if session.modified:
                self.cache.delete(self.key_prefix + session.sid)
                response.delete_cookie(app.session_cookie_name,
                                       domain=domain, path=path)
            return

        # Modification case.  There are upsides and downsides to
        # emitting a set-cookie header each request.  The behavior
        # is controlled by the :meth:`should_set_cookie` method
        # which performs a quick check to figure out if the cookie
        # should be set or not.  This is controlled by the
        # SESSION_REFRESH_EACH_REQUEST config flag as well as
        # the permanent flag on the session itself.
        # if not self.should_set_cookie(app, session):
        #    return

        httponly = self.get_cookie_httponly(app)
        secure = self.get_cookie_secure(app)
        expires = self.get_expiration_time(app, session)
        data = dict(session)
        self.cache.set(self.key_prefix + session.sid, data,
                         int(app.permanent_session_lifetime.total_seconds()))
        response.set_cookie(app.session_cookie_name, session.sid,
                            expires=expires, httponly=httponly,
                            domain=domain, path=path, secure=secure)

# 需要导入模块: from werkzeug.contrib.cache import FileSystemCache [as 别名]
# 或者: from werkzeug.contrib.cache.FileSystemCache import delete [as 别名]
class WechatCache(object):
    """基于文件的缓存

    """

    def __init__(self, cache_dir='cache', default_timeout=300):
        """初始化

        cache_dir是缓存目录
        """
        self.cache = FileSystemCache(cache_dir, default_timeout=default_timeout)

    def clear(self):
        """清空缓存
        """
        return self.cache.clear()

    def get(self, key):
        """获取缓存

        获取键值key的缓存值
        如果没有对应缓存，返回None
        """
        return self.cache.get(key)

    def add(self, key, value, timeout=None):
        """增加缓存

        如果键值key对应的缓存不存在，那么增加值value到键值key，过期时间timeout，默认300秒
        否则返回False（即不能覆盖设置缓存）
        """
        return self.cache.add(key, value, timeout)

    def set(self, key, value, timeout=None):
        """设置缓存

        设置键值key的缓存为value,过期时间300秒
        """
        return self.cache.set(key, value, timeout)

    def delete(self, key):
        """删除缓存

        删除键值key存储的缓存
        """
        return self.cache.delete(key)

# 需要导入模块: from werkzeug.contrib.cache import FileSystemCache [as 别名]
# 或者: from werkzeug.contrib.cache.FileSystemCache import delete [as 别名]
class FileSystemSessionInterface(SessionInterface):
    """Uses the :class:`werkzeug.contrib.cache.FileSystemCache` as a session
    backend.

    .. versionadded:: 0.2
        The `use_signer` parameter was added.

    :param cache_dir: the directory where session files are stored.
    :param threshold: the maximum number of items the session stores before it
                      starts deleting some.
    :param mode: the file mode wanted for the session files, default 0600
    :param key_prefix: A prefix that is added to FileSystemCache store keys.
    :param use_signer: Whether to sign the session id cookie or not.
    :param permanent: Whether to use permanent session or not.
    """

    session_class = FileSystemSession

    def __init__(self, cache_dir, threshold, mode, key_prefix,
                 use_signer=False, permanent=True):
        from werkzeug.contrib.cache import FileSystemCache
        self.cache = FileSystemCache(cache_dir, threshold=threshold, mode=mode)
        self.key_prefix = key_prefix
        self.use_signer = use_signer
        self.permanent = permanent

    def open_session(self, app, request):
        sid = request.cookies.get(app.session_cookie_name)
        if not sid:
            sid = self._generate_sid()
            return self.session_class(sid=sid, permanent=self.permanent)
        if self.use_signer:
            signer = self._get_signer(app)
            if signer is None:
                return None
            try:
                sid = signer.unsign(sid)
            except BadSignature:
                sid = self._generate_sid()
                return self.session_class(sid=sid, permanent=self.permanent)

        data = self.cache.get(self.key_prefix + sid)
        if data is not None:
            return self.session_class(data, sid=sid)
        return self.session_class(sid=sid, permanent=self.permanent)

    def save_session(self, app, session, response):
        domain = self.get_cookie_domain(app)
        path = self.get_cookie_path(app)
        if not session:
            if session.modified:
                self.cache.delete(self.key_prefix + session.sid)
                response.delete_cookie(app.session_cookie_name,
                                       domain=domain, path=path)
            return

        httponly = self.get_cookie_httponly(app)
        secure = self.get_cookie_secure(app)
        expires = self.get_expiration_time(app, session)
        data = dict(session)
        self.cache.set(self.key_prefix + session.sid, data,
                       total_seconds(app.permanent_session_lifetime))
        if self.use_signer:
            session_id = self._get_signer(app).sign(session.sid)
        else:
            session_id = session.sid
        response.set_cookie(app.session_cookie_name, session_id,
                            expires=expires, httponly=httponly,
                            domain=domain, path=path, secure=secure)

# 需要导入模块: from werkzeug.contrib.cache import FileSystemCache [as 别名]
# 或者: from werkzeug.contrib.cache.FileSystemCache import delete [as 别名]
class Cache(object):
    """
    This class is used to control the cache objects.

    If TESTING is True it will use NullCache.
    """

    def __init__(self, app=None):
        self.cache = None

        if app is not None:
            self.init_app(app)
        else:
            self.app = None

    def init_app(self, app):
        "This is used to initialize cache with your app object"

        app.config.setdefault('CACHE_DEFAULT_TIMEOUT', 300)
        app.config.setdefault('CACHE_THRESHOLD', 500)
        app.config.setdefault('CACHE_KEY_PREFIX', None)
        app.config.setdefault('CACHE_MEMCACHED_SERVERS', None)
        app.config.setdefault('CACHE_DIR', None)
        app.config.setdefault('CACHE_TYPE', 'NullCache')

        self.app = app

        self._set_cache()

    def _set_cache(self):
        if self.app.config['TESTING']:
            self.cache = NullCache()
        else:
            if self.app.config['CACHE_TYPE'] == 'Null':
                self.cache = NullCache()
            elif self.app.config['CACHE_TYPE'] == 'Simple':
                self.cache = SimpleCache(
                    threshold=self.app.config['CACHE_THRESHOLD'],
                    default_timeout=self.app.config['CACHE_DEFAULT_TIMEOUT'])
            elif self.app.config['CACHE_TYPE'] == 'Memcached':
                self.cache = MemcachedCache(
                    self.app.config['CACHE_MEMCACHED_SERVERS'],
                    default_timeout=self.app.config['CACHE_DEFAULT_TIMEOUT'],
                    key_prefix=self.app.config['CACHE_KEY_PREFIX'])
            elif self.app.config['CACHE_TYPE'] == 'GAE':
                self.cache = GAEMemcachedCache(
                    default_timeout=self.app.config['CACHE_DEFAULT_TIMEOUT'],
                    key_prefix=self.app.config['CACHE_KEY_PREFIX'])
            elif self.app.config['CACHE_TYPE'] == 'FileSystem':
                self.cache = FileSystemCache(
                    self.app.config['CACHE_DIR'],
                    threshold=self.app.config['CACHE_THRESHOLD'],
                    default_timeout=self.app.config['CACHE_DEFAULT_TIMEOUT'])

    def get(self, *args, **kwargs):
        "Proxy function for internal cache object."
        return self.cache.get(*args, **kwargs)

    def set(self, *args, **kwargs):
        "Proxy function for internal cache object."
        self.cache.set(*args, **kwargs)

    def add(self, *args, **kwargs):
        "Proxy function for internal cache object."
        self.cache.add(*args, **kwargs)

    def delete(self, *args, **kwargs):
        "Proxy function for internal cache object."
        self.cache.delete(*args, **kwargs)

    def cached(self, timeout=None, key_prefix='view/%s', unless=None):
        """
        Decorator. Use this to cache a function. By default the cache key
        is `view/request.path`. You are able to use this decorator with any
        function by changing the `key_prefix`. If the token `%s` is located
        within the `key_prefix` then it will replace that with `request.path`

        Example::

            # An example view function
            @cache.cached(timeout=50)
            def big_foo():
                return big_bar_calc()

            # An example misc function to cache.
            @cache.cached(key_prefix='MyCachedList')
            def get_list():
                return [random.randrange(0, 1) for i in range(50000)]

        .. code-block:: pycon

            >>> my_list = get_list()

        :param timeout: Default None. If set to an integer, will cache for that
                        amount of time.
        :param key_prefix: Default 'view/%(request.path)s'. Beginning key to .
                           use for the cache key.
        :param unless: Default None. Cache will *always* execute the caching
                       facilities unless this callable is true.
                       This will bypass the caching entirely.
#.........这里部分代码省略.........

# 需要导入模块: from werkzeug.contrib.cache import FileSystemCache [as 别名]
# 或者: from werkzeug.contrib.cache.FileSystemCache import delete [as 别名]
class FileSystemSessionInterface(SessionInterface):
    """Uses the :class:`werkzeug.contrib.cache.FileSystemCache` as a session
    backend.

    .. versionadded:: 0.2
        The `use_signer` parameter was added.

    :param cache_dir: the directory where session files are stored.
    :param threshold: the maximum number of items the session stores before it
                      starts deleting some.
    :param mode: the file mode wanted for the session files, default 0600
    :param key_prefix: A prefix that is added to FileSystemCache store keys.
    :param use_signer: Whether to sign the session id cookie or not.
    """

    session_class = FileSystemSession

    def __init__(self, cache_dir, threshold, mode, key_prefix,
                 use_signer=False):
        from werkzeug.contrib.cache import FileSystemCache
        self.cache = FileSystemCache(cache_dir, threshold=threshold, mode=mode) #FileSystemCache是从上句导入的,threshold代表最多纪录条数
        self.key_prefix = key_prefix
        self.use_signer = use_signer

    def open_session(self, app, request):
        sid = request.cookies.get(app.session_cookie_name)
        if not sid:
            sid = self._generate_sid()
            return self.session_class(sid=sid)
        if self.use_signer:
            signer = self._get_signer(app)
            if signer is None:
                return None
            try:
                sid = signer.unsign(sid)
            except BadSignature:
                sid = None

        data = self.cache.get(self.key_prefix + sid)    #这是根据session_id获取session值
        if data is not None:
            return self.session_class(data, sid=sid)
        return self.session_class(sid=sid)
    
    def save_session(self, app, session, response):
        domain = self.get_cookie_domain(app)
        path = self.get_cookie_path(app)
        if not session:     #验证过了，就是判断session是否为空(空字典)
            if session.modified:
                self.cache.delete(self.key_prefix + session.sid)
                response.delete_cookie(app.session_cookie_name,
                                       domain=domain, path=path)
            return

        # Modification case.  There are upsides and downsides to
        # emitting a set-cookie header each request.  The behavior
        # is controlled by the :meth:`should_set_cookie` method
        # which performs a quick check to figure out if the cookie
        # should be set or not.  This is controlled by the
        # SESSION_REFRESH_EACH_REQUEST config flag as well as
        # the permanent flag on the session itself.
        #if not self.should_set_cookie(app, session):
        #    return

        httponly = self.get_cookie_httponly(app)
        secure = self.get_cookie_secure(app)
        expires = self.get_expiration_time(app, session)
        #data = dict(session)
        #self.cache.set(self.key_prefix + session.sid, data,
        #                 int(app.permanent_session_lifetime.total_seconds()))
        if self.use_signer: #签名加密
            session_id = self._get_signer(app).sign(session.sid)
        else:
            session_id = session.sid
        response.set_cookie(app.session_cookie_name, session_id,
                            expires=expires, httponly=httponly,
                            domain=domain, path=path, secure=secure)

    
    def save_session_without_response(self, app, session):

        #httponly = self.get_cookie_httponly(app)
        #secure = self.get_cookie_secure(app)
        #expires = self.get_expiration_time(app, session)
        data = dict(session)
        self.cache.set(self.key_prefix + session.sid, data,    
                     int(app.permanent_session_lifetime.total_seconds()))

    def judge_attack(self, app, request):   #判断两次间隔的访问是否大于三秒
        sid = request.cookies.get(app.session_cookie_name)
        if not sid:
            return False
        current_time = time.time()
        try:
            last_time = self.cache.get(self.key_prefix + sid)['time']    #这是根据session_id获取session值
        except:
            return False
        if current_time-last_time < 3:
            return True
        return False