Shanyou Yu (Sean Yu)
2 years ago
committed by
Haotian Zhang
parent
2e8074b163
commit
b10ef1bf70
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/*
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* Tencent is pleased to support the open source community by making Spring Cloud Tencent available.
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*
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* Copyright (C) 2019 THL A29 Limited, a Tencent company. All rights reserved.
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*
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* Licensed under the BSD 3-Clause License (the "License");
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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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*
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* https://opensource.org/licenses/BSD-3-Clause
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*
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* Unless required by applicable law or agreed to in writing, software distributed
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* under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
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* CONDITIONS OF ANY KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations under the License.
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*/
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package com.tencent.cloud.polaris.loadbalancer;
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import com.tencent.cloud.common.metadata.MetadataContextHolder;
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/**
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* PolarisLoadBalancerRingHashKeyProvider.
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*
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* @author seanthefish
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*/
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public final class PolarisLoadBalancerRingHashKeyProvider {
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private static final String LOAD_BALANCER_HASH_KEY = "LOAD_BALANCER_HASH_KEY";
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private PolarisLoadBalancerRingHashKeyProvider() {
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}
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public static void hashKey(String key) {
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MetadataContextHolder.get().setLoadbalancer(LOAD_BALANCER_HASH_KEY, key);
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}
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static String getHashKey() {
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return MetadataContextHolder.get().getLoadbalancerMetadata().get(LOAD_BALANCER_HASH_KEY);
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}
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}
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@ -0,0 +1,94 @@
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/*
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* Tencent is pleased to support the open source community by making Spring Cloud Tencent available.
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*
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* Copyright (C) 2019 THL A29 Limited, a Tencent company. All rights reserved.
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*
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* Licensed under the BSD 3-Clause License (the "License");
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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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*
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* https://opensource.org/licenses/BSD-3-Clause
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*
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* Unless required by applicable law or agreed to in writing, software distributed
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* under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
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* CONDITIONS OF ANY KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations under the License.
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*
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*/
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package com.tencent.cloud.polaris.loadbalancer;
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import java.util.List;
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import java.util.Optional;
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import com.netflix.client.config.IClientConfig;
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import com.netflix.loadbalancer.AbstractServerPredicate;
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import com.netflix.loadbalancer.AvailabilityPredicate;
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import com.netflix.loadbalancer.CompositePredicate;
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import com.netflix.loadbalancer.PredicateBasedRule;
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import com.netflix.loadbalancer.Server;
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import com.tencent.cloud.common.pojo.PolarisServer;
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import com.tencent.polaris.api.config.consumer.LoadBalanceConfig;
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import com.tencent.polaris.api.pojo.Instance;
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import com.tencent.polaris.api.pojo.ServiceInstances;
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import com.tencent.polaris.api.rpc.Criteria;
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import com.tencent.polaris.router.api.core.RouterAPI;
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import com.tencent.polaris.router.api.rpc.ProcessLoadBalanceRequest;
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import com.tencent.polaris.router.api.rpc.ProcessLoadBalanceResponse;
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import org.springframework.util.CollectionUtils;
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/**
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* Polaris weighted load balancer.
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*
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* @author lepdou 2022-05-17
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*/
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public class PolarisRingHashRule extends PredicateBasedRule {
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private final RouterAPI routerAPI;
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private CompositePredicate compositePredicate;
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public PolarisRingHashRule(RouterAPI routerAPI) {
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this.routerAPI = routerAPI;
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}
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@Override
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public void initWithNiwsConfig(IClientConfig clientConfig) {
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AvailabilityPredicate availabilityPredicate = new AvailabilityPredicate(this, clientConfig);
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compositePredicate = CompositePredicate.withPredicates(availabilityPredicate).build();
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}
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@Override
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public AbstractServerPredicate getPredicate() {
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return compositePredicate;
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}
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@Override
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public Server choose(Object key) {
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List<Server> servers = getLoadBalancer().getReachableServers();
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if (CollectionUtils.isEmpty(servers)) {
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return null;
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}
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// filter circuit breaker servers by ribbon
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if (compositePredicate != null) {
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servers = compositePredicate.getEligibleServers(servers);
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}
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ServiceInstances serviceInstances = LoadBalancerUtils.transferServersToServiceInstances(servers);
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ProcessLoadBalanceRequest request = new ProcessLoadBalanceRequest();
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request.setDstInstances(serviceInstances);
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request.setLbPolicy(LoadBalanceConfig.LOAD_BALANCE_RING_HASH);
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Criteria criteria = new Criteria();
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String hashKey = Optional.ofNullable(PolarisLoadBalancerRingHashKeyProvider.getHashKey()).orElse("");
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criteria.setHashKey(hashKey);
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request.setCriteria(criteria);
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ProcessLoadBalanceResponse processLoadBalanceResponse = routerAPI.processLoadBalance(request);
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Instance targetInstance = processLoadBalanceResponse.getTargetInstance();
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return new PolarisServer(serviceInstances, targetInstance);
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}
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}
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