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/*
* Copyright 2019 The Netty Project
*
* The Netty Project 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 io.netty.handler.codec.http2;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.util.internal.ObjectUtil;
/**
* Enforce a limit on the maximum number of consecutive empty DATA frames (without end_of_stream flag) that are allowed
* before the connection will be closed.
*/
final class Http2EmptyDataFrameListener extends Http2FrameListenerDecorator {
private final int maxConsecutiveEmptyFrames;
private boolean violationDetected;
private int emptyDataFrames;
Http2EmptyDataFrameListener(Http2FrameListener listener, int maxConsecutiveEmptyFrames) {
super(listener);
this.maxConsecutiveEmptyFrames = ObjectUtil.checkPositive(
maxConsecutiveEmptyFrames, "maxConsecutiveEmptyFrames");
}
@Override
public int onDataRead(ChannelHandlerContext ctx, int streamId, ByteBuf data, int padding, boolean endOfStream)
throws Http2Exception {
if (endOfStream || data.isReadable()) {
emptyDataFrames = 0;
} else if (emptyDataFrames++ == maxConsecutiveEmptyFrames && !violationDetected) {
violationDetected = true;
throw Http2Exception.connectionError(Http2Error.ENHANCE_YOUR_CALM,
"Maximum number %d of empty data frames without end_of_stream flag received",
maxConsecutiveEmptyFrames);
}
return super.onDataRead(ctx, streamId, data, padding, endOfStream);
}
@Override
public void onHeadersRead(ChannelHandlerContext ctx, int streamId, Http2Headers headers,
int padding, boolean endStream) throws Http2Exception {
emptyDataFrames = 0;
super.onHeadersRead(ctx, streamId, headers, padding, endStream);
}
@Override
public void onHeadersRead(ChannelHandlerContext ctx, int streamId, Http2Headers headers, int streamDependency,
short weight, boolean exclusive, int padding, boolean endStream) throws Http2Exception {
emptyDataFrames = 0;
super.onHeadersRead(ctx, streamId, headers, streamDependency, weight, exclusive, padding, endStream);
}
}