common/common-access-log/src/main/java/org/apache/servicecomb/common/accessLog/core/element/impl/ResponseSizeAccessItem.java

/*
 * 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.common.accessLog.core.element.impl;

import org.apache.servicecomb.common.accessLog.core.element.AccessLogItem;
import org.apache.servicecomb.core.event.InvocationFinishEvent;
import org.apache.servicecomb.core.event.ServerAccessLogEvent;

import io.vertx.core.http.HttpServerResponse;
import io.vertx.ext.web.RoutingContext;

public class ResponseSizeAccessItem implements AccessLogItem<RoutingContext> {
  // print zeroBytes when bytes is zero
  private final String zeroBytes;

  public ResponseSizeAccessItem(String zeroBytesPlaceholder) {
    zeroBytes = zeroBytesPlaceholder;
  }

  @Override
  public void appendServerFormattedItem(ServerAccessLogEvent accessLogEvent, StringBuilder builder) {
    HttpServerResponse response = accessLogEvent.getRoutingContext().response();
    if (null == response || 0 == response.bytesWritten()) {
      builder.append(zeroBytes);
      return;
    }
    builder.append(response.bytesWritten());
  }

  @Override
  public void appendClientFormattedItem(InvocationFinishEvent finishEvent, StringBuilder builder) {
    // client do not know how to calculate is right, maybe Object#toString().length
    builder.append(zeroBytes);
  }

  public String getZeroBytes() {
    return zeroBytes;
  }
}