import redis
from AnsjerPush.config import REDIS_ADDRESS

# 本地调试把注释打开
# REDIS_ADDRESS = '127.0.0.1'


class RedisObject:

    def __init__(self, db=0):
        pool = redis.ConnectionPool(host=REDIS_ADDRESS, port=6379, db=db)
        self.CONN = redis.Redis(connection_pool=pool)

    def set_data(self, key, val, expire=0):
        try:
            self.CONN.set(key, val)
            if expire > 0:
                self.CONN.expire(key, expire)
        except Exception as e:
            return False
        else:
            return True

    def get_data(self, key):
        try:
            val = self.CONN.get(key)
        except Exception as e:
            print(repr(e))
            return False
        else:
            if val:
                return val.decode('utf-8')
            else:
                return False

    def del_data(self, key):
        try:
            val = self.CONN.delete(key)
        except Exception as e:
            print(repr(e))
            return False
        else:
            return True

    def get_size(self):
        return self.CONN.dbsize()

    # 向列表插入数据
    def rpush(self, name, val):
        self.CONN.rpush(name, val)

    # 获取列表长度
    def llen(self, name):
        return self.CONN.llen(name=name)

    # 获取列表所有数据
    def lrange(self, name, start, end):
        return self.CONN.lrange(name, start, end)

    def get_ttl(self, key):
        ttl = self.CONN.ttl(key)
        if ttl:
            return ttl
        else:
            return 0

    def ltrim(self, name, start, end):
        """
        对一个列表进行修剪(trim),让列表只保留指定区间内的元素,不在指定区间之内的元素都将被删除
        @param name: 列表名称
        @param start: 区间开始下标, 0:第一个元素
        @param end: 区间结束下标, -1:最后一个元素
        @return : bool
        """
        return self.CONN.ltrim(name, start, end)

    def lindex(self, name, index=-1):
        """
        根据下标查找元素
        @param name: 列表名称
        @param index: 区间结束下标, -1:最后一个元素
        @return : bool
        """
        return self.CONN.lindex(name, index)

    def close(self):
        """
        关闭连接
        """
        return self.CONN.close()