code: /*
   * 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.skywalking.oap.server.analyzer.agent.kafka.provider.handler;
  
  import com.google.gson.JsonObject;
  import java.util.ArrayList;
  import java.util.List;
  import lombok.extern.slf4j.Slf4j;
  import org.apache.kafka.clients.consumer.ConsumerRecord;
  import org.apache.kafka.common.utils.Bytes;
  import org.apache.skywalking.apm.network.management.v3.InstancePingPkg;
  import org.apache.skywalking.apm.network.management.v3.InstanceProperties;
  import org.apache.skywalking.oap.server.analyzer.agent.kafka.module.KafkaFetcherConfig;
  import org.apache.skywalking.oap.server.core.CoreModule;
  import org.apache.skywalking.oap.server.core.analysis.DownSampling;
  import org.apache.skywalking.oap.server.core.analysis.IDManager;
  import org.apache.skywalking.oap.server.core.analysis.Layer;
  import org.apache.skywalking.oap.server.core.analysis.TimeBucket;
  import org.apache.skywalking.oap.server.core.analysis.manual.instance.InstanceTraffic;
  import org.apache.skywalking.oap.server.core.config.NamingControl;
  import org.apache.skywalking.oap.server.core.source.ServiceInstanceUpdate;
  import org.apache.skywalking.oap.server.core.source.ServiceMeta;
  import org.apache.skywalking.oap.server.core.source.SourceReceiver;
  import org.apache.skywalking.oap.server.library.module.ModuleManager;
  
  /**
   * A handler deserializes the message of Service Management and pushes it to downstream.
   */
  @Slf4j
  public class ServiceManagementHandler extends AbstractKafkaHandler {
  
      private final SourceReceiver sourceReceiver;
      private final NamingControl namingLengthControl;
  
      public ServiceManagementHandler(ModuleManager moduleManager, KafkaFetcherConfig config) {
          super(moduleManager, config);
          this.sourceReceiver = moduleManager.find(CoreModule.NAME).provider().getService(SourceReceiver.class);
          this.namingLengthControl = moduleManager.find(CoreModule.NAME)
                                                  .provider()
                                                  .getService(NamingControl.class);
          this.config = config;
      }
  
      @Override
      public void handle(final ConsumerRecord<String, Bytes> record) {
          try {
              if (record.key().startsWith("register-")) {
                  serviceReportProperties(InstanceProperties.parseFrom(record.value().get()));
              } else {
                  keepAlive(InstancePingPkg.parseFrom(record.value().get()));
              }
          } catch (Exception e) {
              log.error("handle record failed", e);
          }
      }
  
      private void serviceReportProperties(InstanceProperties request) {
          ServiceInstanceUpdate serviceInstanceUpdate = new ServiceInstanceUpdate();
          final String serviceName = namingLengthControl.formatServiceName(request.getService());
          final String instanceName = namingLengthControl.formatInstanceName(request.getServiceInstance());
          serviceInstanceUpdate.setServiceId(IDManager.ServiceID.buildId(serviceName, true));
          serviceInstanceUpdate.setName(instanceName);
  
          if (log.isDebugEnabled()) {
              log.debug("Service[{}] instance[{}] registered.", serviceName, instanceName);
          }
  
          JsonObject properties = new JsonObject();
          List<String> ipv4List = new ArrayList<>();
          request.getPropertiesList().forEach(prop -> {
              if (InstanceTraffic.PropertyUtil.IPV4.equals(prop.getKey())) {
                  ipv4List.add(prop.getValue());
              } else {
                  properties.addProperty(prop.getKey(), prop.getValue());
              }
          });
          properties.addProperty(InstanceTraffic.PropertyUtil.IPV4S, String.join(",", ipv4List));
          serviceInstanceUpdate.setProperties(properties);
          serviceInstanceUpdate.setTimeBucket(
              TimeBucket.getTimeBucket(System.currentTimeMillis(), DownSampling.Minute));
          sourceReceiver.receive(serviceInstanceUpdate);
      }
  
      private void keepAlive(InstancePingPkg request) {
          final long timeBucket = TimeBucket.getTimeBucket(System.currentTimeMillis(), DownSampling.Minute);
          final String serviceName = namingLengthControl.formatServiceName(request.getService());
          final String instanceName = namingLengthControl.formatInstanceName(request.getServiceInstance());
  
          if (log.isDebugEnabled()) {
              log.debug("A ping of Service[{}] instance[{}].", serviceName, instanceName);
          }
  
          ServiceInstanceUpdate serviceInstanceUpdate = new ServiceInstanceUpdate();
          serviceInstanceUpdate.setServiceId(IDManager.ServiceID.buildId(serviceName, true));
          serviceInstanceUpdate.setName(instanceName);
          serviceInstanceUpdate.setTimeBucket(timeBucket);
          sourceReceiver.receive(serviceInstanceUpdate);
  
          ServiceMeta serviceMeta = new ServiceMeta();
          serviceMeta.setName(serviceName);
          serviceMeta.setTimeBucket(timeBucket);
          serviceMeta.setLayer(Layer.GENERAL);
          sourceReceiver.receive(serviceMeta);
      }
  
      @Override
      protected String getPlainTopic() {
          return config.getTopicNameOfManagements();
      }
  }
  