etteeee commented on a change in pull request #2677: URL: https://github.com/apache/servicecomb-java-chassis/pull/2677#discussion_r777876245
########## File path: handlers/handler-loadbalance/src/main/java/org/apache/servicecomb/loadbalance/filter/PriorityInstancePropertyDiscoveryFilter.java ########## @@ -0,0 +1,195 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You under the Apache License, Version 2.0 + * (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package org.apache.servicecomb.loadbalance.filter; + +import java.util.HashMap; +import java.util.Map; +import java.util.Objects; +import java.util.Optional; + +import javax.validation.constraints.NotNull; + +import org.apache.commons.lang3.StringUtils; +import org.apache.servicecomb.core.Invocation; +import org.apache.servicecomb.registry.RegistrationManager; +import org.apache.servicecomb.registry.api.registry.MicroserviceInstance; +import org.apache.servicecomb.registry.discovery.AbstractDiscoveryFilter; +import org.apache.servicecomb.registry.discovery.DiscoveryContext; +import org.apache.servicecomb.registry.discovery.DiscoveryTreeNode; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import com.netflix.config.DynamicPropertyFactory; + +/** + * Instance property with priority filter + */ +public class PriorityInstancePropertyDiscoveryFilter extends AbstractDiscoveryFilter { + + private static final Logger LOGGER = LoggerFactory.getLogger(PriorityInstancePropertyDiscoveryFilter.class); + + private static final String ALL_INSTANCE = "allInstance"; + + private String propertyKey; + + @Override + protected void init(DiscoveryContext context, DiscoveryTreeNode parent) { + propertyKey = DynamicPropertyFactory.getInstance() + .getStringProperty("servicecomb.loadbalance.filter.priorityInstanceProperty.key", "environment") + .get(); + + // group all instance by property + Map<String, MicroserviceInstance> instances = parent.data(); + Map<String, Map<String, MicroserviceInstance>> groupByProperty = new HashMap<>(); + for (MicroserviceInstance microserviceInstance : instances.values()) { + String propertyValue = new PriorityInstanceProperty(propertyKey, microserviceInstance).getPropertyValue(); + groupByProperty.computeIfAbsent(propertyValue, key -> new HashMap<>()) + .put(microserviceInstance.getInstanceId(), microserviceInstance); + } + Map<String, DiscoveryTreeNode> children = new HashMap<>(); + for (Map.Entry<String, Map<String, MicroserviceInstance>> entry : groupByProperty.entrySet()) { + children.put(entry.getKey(), + new DiscoveryTreeNode().subName(parent, entry.getKey()).data(entry.getValue())); + } + children.put(ALL_INSTANCE, new DiscoveryTreeNode().subName(parent, ALL_INSTANCE).data(instances)); + parent.children(children); + } + + @Override + protected String findChildName(DiscoveryContext context, DiscoveryTreeNode parent) { + Invocation invocation = context.getInputParameters(); + + // context property has precedence over instance property + String initPropertyValue = invocation.getContext() + .computeIfAbsent("x-" + propertyKey, + key -> new PriorityInstanceProperty(propertyKey, RegistrationManager.INSTANCE.getMicroserviceInstance()) + .getPropertyValue()); + + PriorityInstanceProperty currentProperty = context.getContextParameter(propertyKey); + // start with initial value, then search with priority + if (Objects.isNull(currentProperty)) { + currentProperty = new PriorityInstanceProperty(propertyKey, initPropertyValue); + while (!parent.children().containsKey(currentProperty.getPropertyValue()) + && currentProperty.hasChildren()) { + currentProperty = currentProperty.child(); + } + } else { + if (currentProperty.hasChildren()) { + currentProperty = currentProperty.child(); + } + } + LOGGER.info("Discovery instance filter by {}", currentProperty.toString()); + context.putContextParameter(propertyKey, currentProperty); + + // stop push filter stack if property is empty + if (currentProperty.isEmpty()) { + return currentProperty.getPropertyValue(); + } + context.pushRerunFilter(); + return currentProperty.getPropertyValue(); + } + + @Override + public boolean enabled() { + return DynamicPropertyFactory.getInstance() + .getBooleanProperty("servicecomb.loadbalance.filter.priorityInstanceProperty.enabled", false) + .get(); + } + + @Override + public int getOrder() { + return new InstancePropertyDiscoveryFilter().getOrder() + 1; + } + + class PriorityInstanceProperty { + + private static final String SEPARATOR = "."; + + private final String propertyKey; + + private final String propertyVal; + + /** + * Constructor + * + * @param key property key + * @param value property value + */ + public PriorityInstanceProperty(@NotNull String key, String value) { + propertyKey = key; + if (Objects.isNull(value)) { + value = StringUtils.EMPTY; + } + propertyVal = value; + } + + /** + * Constructor + * + * @param key property key + * @param microserviceInstance instance + */ + public PriorityInstanceProperty(@NotNull String key, @NotNull MicroserviceInstance microserviceInstance) { + this(key, Optional.ofNullable(microserviceInstance.getProperties().get(key)).orElse(StringUtils.EMPTY)); + } + + /** + * whether property is empty + * + * @return result + */ + public boolean isEmpty() { + return StringUtils.isEmpty(propertyVal); + } + + /** + * does property have lower priority children + * + * @return result + */ + public boolean hasChildren() { + return StringUtils.isNotEmpty(propertyVal) && propertyVal.length() < 100; 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