115 lines
4.4 KiB
Java
115 lines
4.4 KiB
Java
/**
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* Copyright (c) 2018-2028, Chill Zhuang 庄骞 (smallchill@163.com).
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* <p>
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* Licensed under the GNU LESSER GENERAL PUBLIC LICENSE 3.0;
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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* <p>
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* http://www.gnu.org/licenses/lgpl.html
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* <p>
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.springblade.core.loadbalancer.rule;
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import com.alibaba.nacos.common.utils.StringUtils;
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import lombok.RequiredArgsConstructor;
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import lombok.extern.slf4j.Slf4j;
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import org.springblade.core.loadbalancer.props.BladeLoadBalancerProperties;
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import org.springframework.beans.factory.ObjectProvider;
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import org.springframework.cloud.client.ServiceInstance;
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import org.springframework.cloud.client.loadbalancer.*;
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import org.springframework.cloud.loadbalancer.core.NoopServiceInstanceListSupplier;
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import org.springframework.cloud.loadbalancer.core.ReactorServiceInstanceLoadBalancer;
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import org.springframework.cloud.loadbalancer.core.ServiceInstanceListSupplier;
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import org.springframework.http.HttpHeaders;
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import org.springframework.util.CollectionUtils;
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import org.springframework.util.PatternMatchUtils;
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import reactor.core.publisher.Mono;
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import java.util.List;
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import java.util.concurrent.ThreadLocalRandom;
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import java.util.stream.Collectors;
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import static org.springblade.core.loadbalancer.constant.LoadBalancerConstant.VERSION_NAME;
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/**
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* LoadBalancer 负载规则
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*
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* @author Chill
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*/
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@Slf4j
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@RequiredArgsConstructor
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public class GrayscaleLoadBalancer implements ReactorServiceInstanceLoadBalancer {
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private final ObjectProvider<ServiceInstanceListSupplier> serviceInstanceListSupplierProvider;
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private final BladeLoadBalancerProperties bladeLoadBalancerProperties;
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@Override
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public Mono<Response<ServiceInstance>> choose(Request request) {
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ServiceInstanceListSupplier supplier = serviceInstanceListSupplierProvider
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.getIfAvailable(NoopServiceInstanceListSupplier::new);
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return supplier.get(request).next()
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.map(serviceInstances -> getInstanceResponse(serviceInstances, request));
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}
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/**
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* 自定义节点规则返回目标节点
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*/
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private Response<ServiceInstance> getInstanceResponse(List<ServiceInstance> instances, Request request) {
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// 注册中心无可用实例 返回空
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if (CollectionUtils.isEmpty(instances)) {
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return new EmptyResponse();
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}
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// 指定ip则返回满足ip的服务
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List<String> priorIpPattern = bladeLoadBalancerProperties.getPriorIpPattern();
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if (!priorIpPattern.isEmpty()) {
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String[] priorIpPatterns = priorIpPattern.toArray(new String[0]);
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List<ServiceInstance> priorIpInstances = instances.stream().filter(
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(i -> PatternMatchUtils.simpleMatch(priorIpPatterns, i.getHost()))
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).collect(Collectors.toList());
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if (!priorIpInstances.isEmpty()) {
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instances = priorIpInstances;
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}
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}
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// 获取灰度版本号
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DefaultRequestContext context = (DefaultRequestContext) request.getContext();
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RequestData requestData = (RequestData) context.getClientRequest();
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HttpHeaders headers = requestData.getHeaders();
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String versionName = headers.getFirst(VERSION_NAME);
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// 没有指定灰度版本则返回正式的服务
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if (StringUtils.isBlank(versionName)) {
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List<ServiceInstance> noneGrayscaleInstances = instances.stream().filter(
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i -> !i.getMetadata().containsKey(VERSION_NAME)
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).collect(Collectors.toList());
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return randomInstance(noneGrayscaleInstances);
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}
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// 指定灰度版本则返回标记的服务
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List<ServiceInstance> grayscaleInstances = instances.stream().filter(i -> {
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String versionNameInMetadata = i.getMetadata().get(VERSION_NAME);
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return StringUtils.equalsIgnoreCase(versionNameInMetadata, versionName);
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}).collect(Collectors.toList());
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return randomInstance(grayscaleInstances);
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}
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/**
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* 采用随机规则返回
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*/
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private Response<ServiceInstance> randomInstance(List<ServiceInstance> instances) {
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// 若没有可用节点则返回空
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if (instances.isEmpty()) {
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return new EmptyResponse();
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}
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// 挑选随机节点返回
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int randomIndex = ThreadLocalRandom.current().nextInt(instances.size());
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ServiceInstance instance = instances.get(randomIndex % instances.size());
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return new DefaultResponse(instance);
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}
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}
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