| 提交 | 用户 | 时间 | ||
| e7c126 | 1 | package com.iailab.framework.env.core.fegin; |
| H | 2 | |
| 3 | import cn.hutool.core.collection.CollUtil; | |
| 4 | import cn.hutool.core.util.StrUtil; | |
| 5 | import com.iailab.framework.common.util.collection.CollectionUtils; | |
| 6 | import com.iailab.framework.env.core.context.EnvContextHolder; | |
| 7 | import com.iailab.framework.env.core.util.EnvUtils; | |
| 8 | import com.alibaba.cloud.nacos.balancer.NacosBalancer; | |
| 9 | import lombok.RequiredArgsConstructor; | |
| 10 | import lombok.extern.slf4j.Slf4j; | |
| 11 | import org.springframework.beans.factory.ObjectProvider; | |
| 12 | import org.springframework.cloud.client.ServiceInstance; | |
| 13 | import org.springframework.cloud.client.loadbalancer.DefaultResponse; | |
| 14 | import org.springframework.cloud.client.loadbalancer.EmptyResponse; | |
| 15 | import org.springframework.cloud.client.loadbalancer.Request; | |
| 16 | import org.springframework.cloud.client.loadbalancer.Response; | |
| 17 | import org.springframework.cloud.client.loadbalancer.reactive.ReactiveLoadBalancer; | |
| 18 | import org.springframework.cloud.loadbalancer.core.NoopServiceInstanceListSupplier; | |
| 19 | import org.springframework.cloud.loadbalancer.core.ReactorServiceInstanceLoadBalancer; | |
| 20 | import org.springframework.cloud.loadbalancer.core.ServiceInstanceListSupplier; | |
| 21 | import reactor.core.publisher.Mono; | |
| 22 | ||
| 23 | import java.util.List; | |
| 24 | ||
| 25 | /** | |
| 26 | * 多环境的 {@link org.springframework.cloud.client.loadbalancer.LoadBalancerClient} 实现类 | |
| 27 | * 在从服务实例列表选择时，优先选择 tag 匹配的服务实例 | |
| 28 | * | |
| 29 | * @author iailab | |
| 30 | */ | |
| 31 | @RequiredArgsConstructor | |
| 32 | @Slf4j | |
| 33 | public class EnvLoadBalancerClient implements ReactorServiceInstanceLoadBalancer { | |
| 34 | ||
| 35 | /** | |
| 36 | * 用于获取 serviceId 对应的服务实例的列表 | |
| 37 | */ | |
| 38 | private final ObjectProvider<ServiceInstanceListSupplier> serviceInstanceListSupplierProvider; | |
| 39 | /** | |
| 40 | * 需要获取的服务实例名 | |
| 41 | * | |
| 42 | * 暂时用于打印 logger 日志 | |
| 43 | */ | |
| 44 | private final String serviceId; | |
| 45 | /** | |
| 46 | * 被代理的 ReactiveLoadBalancer 对象 | |
| 47 | */ | |
| 48 | private final ReactiveLoadBalancer<ServiceInstance> reactiveLoadBalancer; | |
| 49 | ||
| 50 | @Override | |
| 51 | public Mono<Response<ServiceInstance>> choose(Request request) { | |
| 52 | // 情况一，没有 tag 时，使用默认的 reactiveLoadBalancer 实现负载均衡 | |
| 53 | String tag = EnvContextHolder.getTag(); | |
| 54 | if (StrUtil.isEmpty(tag)) { | |
| 55 | return Mono.from(reactiveLoadBalancer.choose(request)); | |
| 56 | } | |
| 57 | ||
| 58 | // 情况二，有 tag 时，使用 tag 匹配服务实例 | |
| 59 | ServiceInstanceListSupplier supplier = serviceInstanceListSupplierProvider.getIfAvailable(NoopServiceInstanceListSupplier::new); | |
| 60 | return supplier.get(request).next().map(list -> getInstanceResponse(list, tag)); | |
| 61 | } | |
| 62 | ||
| 63 | private Response<ServiceInstance> getInstanceResponse(List<ServiceInstance> instances, String tag) { | |
| 64 | // 如果服务实例为空，则直接返回 | |
| 65 | if (CollUtil.isEmpty(instances)) { | |
| 66 | log.warn("[getInstanceResponse][serviceId({}) 服务实例列表为空]", serviceId); | |
| 67 | return new EmptyResponse(); | |
| 68 | } | |
| 69 | ||
| 70 | // 筛选满足条件的实例列表 | |
| 71 | List<ServiceInstance> chooseInstances = CollectionUtils.filterList(instances, instance -> tag.equals(EnvUtils.getTag(instance))); | |
| 72 | if (CollUtil.isEmpty(chooseInstances)) { | |
| 73 | log.warn("[getInstanceResponse][serviceId({}) 没有满足 tag({}) 的服务实例列表，直接使用所有服务实例列表]", serviceId, tag); | |
| 74 | chooseInstances = instances; | |
| 75 | } | |
| 76 | ||
| 77 | // TODO iailab：https://juejin.cn/post/7056770721858469896 想通网段 | |
| 78 | ||
| 79 | // 随机 + 权重获取实例列表 TODO iailab：目前直接使用 Nacos 提供的方法，如果替换注册中心，需要重新失败该方法 | |
| 80 | return new DefaultResponse(NacosBalancer.getHostByRandomWeight3(chooseInstances)); | |
| 81 | } | |
| 82 | ||
| 83 | } | |
