DefaultHttp2HeadersDecoder.java — netty Source File

Source Code

/*
 * Copyright 2014 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:
 *
 * https://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.util.internal.ObjectUtil;

import static io.netty.handler.codec.http2.Http2CodecUtil.DEFAULT_HEADER_LIST_SIZE;
import static io.netty.handler.codec.http2.Http2Error.COMPRESSION_ERROR;
import static io.netty.handler.codec.http2.Http2Error.INTERNAL_ERROR;
import static io.netty.handler.codec.http2.Http2Exception.connectionError;

public class DefaultHttp2HeadersDecoder implements Http2HeadersDecoder, Http2HeadersDecoder.Configuration {
    private static final float HEADERS_COUNT_WEIGHT_NEW = 1 / 5f;
    private static final float HEADERS_COUNT_WEIGHT_HISTORICAL = 1 - HEADERS_COUNT_WEIGHT_NEW;

    private final HpackDecoder hpackDecoder;
    private final boolean validateHeaders;
    private final boolean validateHeaderValues;
    private long maxHeaderListSizeGoAway;

    /**
     * Used to calculate an exponential moving average of header sizes to get an estimate of how large the data
     * structure for storing headers should be.
     */
    private float headerArraySizeAccumulator = 8;

    public DefaultHttp2HeadersDecoder() {
        this(true);
    }

    /**
     * Create a new instance.
     * @param validateHeaders {@code true} to validate headers are valid according to the RFC.
     */
    public DefaultHttp2HeadersDecoder(boolean validateHeaders) {
        this(validateHeaders, DEFAULT_HEADER_LIST_SIZE);
    }

    /**
     * Create a new instance.
     *
     * @param validateHeaders {@code true} to validate headers are valid according to the RFC.
     * This validates everything except header values.
     * @param validateHeaderValues {@code true} to validate that header <em>values</em> are valid according to the RFC.
     * Since this is potentially expensive, it can be enabled separately from {@code validateHeaders}.
     */
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