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 lombok.extern.slf4j.Slf4j;
  import org.apache.kafka.clients.consumer.ConsumerRecord;
  import org.apache.kafka.common.utils.Bytes;
  import org.apache.skywalking.apm.network.logging.v3.LogData;
  import org.apache.skywalking.oap.log.analyzer.module.LogAnalyzerModule;
  import org.apache.skywalking.oap.log.analyzer.provider.log.ILogAnalyzerService;
  import org.apache.skywalking.oap.server.analyzer.agent.kafka.module.KafkaFetcherConfig;
  import org.apache.skywalking.oap.server.library.module.ModuleManager;
  import org.apache.skywalking.oap.server.telemetry.TelemetryModule;
  import org.apache.skywalking.oap.server.telemetry.api.CounterMetrics;
  import org.apache.skywalking.oap.server.telemetry.api.HistogramMetrics;
  import org.apache.skywalking.oap.server.telemetry.api.MetricsCreator;
  import org.apache.skywalking.oap.server.telemetry.api.MetricsTag;
  
  @Slf4j
  public class LogHandler extends AbstractKafkaHandler {
  
      private final HistogramMetrics histogram;
      private final CounterMetrics errorCounter;
      private final ILogAnalyzerService logAnalyzerService;
  
      public LogHandler(final ModuleManager moduleManager,
                        final KafkaFetcherConfig config) {
          super(moduleManager, config);
          this.logAnalyzerService = moduleManager.find(LogAnalyzerModule.NAME)
                                                 .provider()
                                                 .getService(ILogAnalyzerService.class);
  
          MetricsCreator metricsCreator = moduleManager.find(TelemetryModule.NAME)
                                                       .provider()
                                                       .getService(MetricsCreator.class);
          histogram = metricsCreator.createHistogramMetric(
              "log_in_latency",
              "The process latency of log",
              new MetricsTag.Keys("protocol", "data_format"),
              new MetricsTag.Values("kafka", getDataFormat())
          );
          errorCounter = metricsCreator.createCounter(
              "log_analysis_error_count",
              "The error number of log analysis",
              new MetricsTag.Keys("protocol", "data_format"),
              new MetricsTag.Values("kafka", getDataFormat())
          );
      }
  
      @Override
      protected String getPlainTopic() {
          return config.getTopicNameOfLogs();
      }
  
      @Override
      public void handle(final ConsumerRecord<String, Bytes> record) {
          try (HistogramMetrics.Timer ignore = histogram.createTimer()) {
              LogData logData = parseConsumerRecord(record);
              logAnalyzerService.doAnalysis(logData, null);
          } catch (Exception e) {
              errorCounter.inc();
              log.error(e.getMessage(), e);
          }
      }
  
      protected String getDataFormat() {
          return "protobuf";
      }
  
      protected LogData parseConsumerRecord(ConsumerRecord<String, Bytes> record) throws Exception {
          return LogData.parseFrom(record.value().get());
      }
  }
  