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.query.graphql.type;
  
  import static java.lang.String.format;
  import java.time.Instant;
  import java.time.format.DateTimeFormatter;
  import java.time.format.ResolverStyle;
  import java.time.temporal.TemporalAccessor;
  import java.util.List;
  import com.google.common.base.Splitter;
  import org.apache.skywalking.oap.server.core.query.type.ContentType;
  import org.apache.skywalking.oap.server.core.query.type.Log;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import lombok.RequiredArgsConstructor;
  
  @RequiredArgsConstructor
  public class LogAdapter {
      private static final Logger LOGGER = LoggerFactory.getLogger(LogAdapter.class);
  
      private final InternalLog log;
  
      // k8s promises RFC3339 or RFC3339Nano timestamp, we truncate to RFC3339
      private final DateTimeFormatter rfc3339Formatter =
          DateTimeFormatter.ofPattern("yyyy-MM-dd'T'HH:mm:ssZZZZZ")
              .withResolverStyle(ResolverStyle.LENIENT);
  
      public Log adapt() {
          Log l = new Log();
  
          List<String> timeAndContent = Splitter.on(" ")
              .limit(2)
              .trimResults()
              .splitToList(log.line());
          if (timeAndContent.size() == 2) {
              String timeStr = timeAndContent.get(0).replaceAll("\\.\\d+Z", "Z");
              try {
                  TemporalAccessor t = rfc3339Formatter.parse(timeStr);
                  long timestamp = Instant.from(t).getEpochSecond();
                  l.setTimestamp(timestamp);
                  l.setContent(format("[%s] %s", log.container(), timeAndContent.get(1)));
                  l.setContentType(ContentType.TEXT);
              } catch (Exception e) {
                  LOGGER.warn("Failed to parse log entry, {}", log, e);
              }
          }
  
          return l;
      }
  }
  