"""Session management interface module."""
from json import dumps, loads


class RedisSessionDB(dict):
    """Dict interface for Redis session management."""

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

    def keys(self):
        return self.connection.keys()

    def flushall(self):
        self.connection.flushall()

    def __getitem__(self, key):
        value = self.connection.get(key)
        if value is None:
            raise KeyError(key)
        utf8ified = str(value, "utf-8")
        return loads(utf8ified)

    def __setitem__(self, key, value):
        value = dumps(value)
        self.connection.set(key, value)

    def __contains__(self, item):
        return self.connection.exists(item)

    def __delitem__(self, key):
        self.connection.delete(key)