src/main/java/com/googlesource/gerrit/plugins/replication/ReplicationLogFile.java

// Copyright (C) 2014 The Android Open Source Project
//
// Licensed 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 com.googlesource.gerrit.plugins.replication;

import com.google.gerrit.extensions.systemstatus.ServerInformation;
import com.google.gerrit.server.config.LogConfig;
import com.google.gerrit.server.util.PluginLogFile;
import com.google.gerrit.server.util.SystemLog;
import com.google.gerrit.util.logging.JsonLayout;
import com.google.gerrit.util.logging.JsonLogEntry;
import com.google.gson.annotations.SerializedName;
import com.google.inject.Inject;
import java.util.HashMap;
import java.util.Map;
import org.apache.log4j.PatternLayout;
import org.apache.log4j.spi.LoggingEvent;
import org.apache.log4j.spi.ThrowableInformation;

public class ReplicationLogFile extends PluginLogFile {

  @Inject
  public ReplicationLogFile(SystemLog systemLog, ServerInformation serverInfo, LogConfig config) {
    super(
        systemLog,
        serverInfo,
        ReplicationQueue.REPLICATION_LOG_NAME,
        new PatternLayout("[%d] %m%n"),
        new ReplicationJsonLayout(),
        config);
  }

  static class ReplicationJsonLayout extends JsonLayout {
    @SuppressWarnings("unused")
    private class ReplicationJsonLogEntry extends JsonLogEntry {
      public String timestamp;
      public String message;
      public Map<String, String> exception;

      @SerializedName("@version")
      public final int version = 2;

      public ReplicationJsonLogEntry(LoggingEvent event) {
        timestamp = timestampFormatter.format(event.getTimeStamp());
        message = (String) event.getMessage();

        if (event.getThrowableInformation() != null) {
          this.exception = getException(event.getThrowableInformation());
        }
      }
    }

    @Override
    public JsonLogEntry toJsonLogEntry(LoggingEvent event) {
      return new ReplicationJsonLogEntry(event);
    }

    private Map<String, String> getException(ThrowableInformation throwable) {
      HashMap<String, String> exceptionInformation = new HashMap<>();

      String throwableName = throwable.getThrowable().getClass().getCanonicalName();
      if (throwableName != null) {
        exceptionInformation.put("exception_class", throwableName);
      }

      String throwableMessage = throwable.getThrowable().getMessage();
      if (throwableMessage != null) {
        exceptionInformation.put("exception_message", throwableMessage);
      }

      String[] stackTrace = throwable.getThrowableStrRep();
      if (stackTrace != null) {
        exceptionInformation.put("stacktrace", String.join("\n", stackTrace));
      }
      return exceptionInformation;
    }
  }
}