$redis_pool

获取redis连接池对象

例子：

    /**
     * Redis decrBy 命令
     */
    public function testRedisDecrBy()
    {
        yield $this->redis_pool->getCoroutine()->set('key1', 10);
        yield $this->redis_pool->getCoroutine()->decrBy('key1', 10);
        $value = yield $this->redis_pool->getCoroutine()->get('key1');
        $this->destory();
    }