Is it possible to put a client node inside a server node when making service?

Iam trying to make a Service and as far as I know, all the functions are stored in the server node and inside the client node is where the parameters or arguments you want for the server. What Im trying to make is a service that will spawn turtle n times. The code compiles flawlessly also gives me the response when using rosservice command. Problem is I cant spawn any turtle, (turtlesim_spawn_client.call(srv)) always returns to false. Please help

 #include "ros/ros.h"
 #include "srv_turtlesim/spawn_turtle.h"
 #include "turtlesim/Spawn.h"

 ros::ServiceClient turtlesim_spawn_client;

 class spawn_turtle_class
{
public:
spawn_turtle_class(ros::NodeHandle& nh)
{
    turtlesim_spawn_client = nh.serviceClient<turtlesim::Spawn>("turtlesim_spawn");
}

bool spawn_callback(srv_turtlesim::spawn_turtle::Request &req,
                    srv_turtlesim::spawn_turtle::Response &res)
{
    bool not_spawn=false;
    turtlesim::Spawn srv;
    ROS_INFO("request: n=%d", (int)req.num_turtle);

/----------------------------------------------------------------------------------------/

    for (int i = 0; req.num_turtle > i; i++)
    {
        srv.request.x = random() % 12;
        srv.request.y = random() % 12;
        srv.request.theta = random() % 360;

        if (turtlesim_spawn_client.call(srv))
        {
            ROS_INFO("response: You got turt");
        }
        else
        {
            ROS_INFO("response: No turt :(");
            not_spawn = true;
        }        
    }

/----------------------------------------------------------------------------------------/

    if (not_spawn)
    {
        res.status = "Incomplete";
    }
    else
    {
        res.status = "Done";
    }

    return true;
}

};

int main (int argc, char**argv)
{
ros::init(argc,argv, "spawn_node");
ros::NodeHandle nh;
spawn_turtle_class spawn2(nh);
ros::ServiceServer service = nh.advertiseService("spawn_turtle_srv", &spawn_turtle_class::spawn_callback, &spawn2);
ros::spin();
return 0;
}