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package org.yes.tools.client;

import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.loadbalancer.Request;
import org.springframework.cloud.client.loadbalancer.Response;
import org.springframework.cloud.client.loadbalancer.reactive.ReactiveLoadBalancer;
import org.springframework.cloud.loadbalancer.blocking.client.BlockingLoadBalancerClient;
import org.springframework.stereotype.Component;
import reactor.core.publisher.Mono;

import java.util.concurrent.ExecutionException;

/**
 * @author Co.
 * @name LoadBalancerClient
 * @date 2023/10/24 10:24
 */
@Component
public class LoadBalancerClient extends BlockingLoadBalancerClient {
    private final ReactiveLoadBalancer.Factory loadBalancerClientFactory;

    public LoadBalancerClient(ReactiveLoadBalancer.Factory loadBalancerClientFactory) {
        super(loadBalancerClientFactory);
        this.loadBalancerClientFactory = loadBalancerClientFactory;
    }

    @Override
    public  ServiceInstance choose(String serviceId, Request request) {
        ReactiveLoadBalancer loadBalancer = this.loadBalancerClientFactory.getInstance(serviceId);
        if (loadBalancer == null) {
            return null;
        }
        Response loadBalancerResponse = null;
        try {
            loadBalancerResponse = Mono.from(loadBalancer.choose(request)).toFuture().get();
        } catch (InterruptedException e) {
            throw new RuntimeException(e);
        } catch (ExecutionException e) {
            throw new RuntimeException(e);
        }
        if (loadBalancerResponse == null) {
            return null;
        }
        return loadBalancerResponse.getServer();
    }
}