Http3ControlStreamOutboundHandler.java — netty Source File

Source Code

/*
 * Copyright 2020 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.http3;

import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandler;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelPromise;
import io.netty.channel.socket.ChannelInputShutdownEvent;
import io.netty.util.ReferenceCountUtil;
import io.netty.util.internal.ObjectUtil;
import org.jetbrains.annotations.Nullable;

import static io.netty.handler.codec.http3.Http3CodecUtils.closeOnFailure;

final class Http3ControlStreamOutboundHandler
        extends Http3FrameTypeDuplexValidationHandler<Http3ControlStreamFrame> {
    private final boolean server;
    private final ChannelHandler codec;
    private Long sentMaxPushId;
    private Long sendGoAwayId;
    private Http3SettingsFrame localSettings;

    Http3ControlStreamOutboundHandler(boolean server, Http3SettingsFrame localSettings, ChannelHandler codec) {
        super(Http3ControlStreamFrame.class);
        this.server = server;
        this.localSettings = ObjectUtil.checkNotNull(localSettings, "localSettings");
        this.codec = ObjectUtil.checkNotNull(codec, "codec");
    }

    /**
     * Returns the last id that was sent in a MAX_PUSH_ID frame or {@code null} if none was sent yet.
     *
     * @return the id.
     */
    @Nullable
    Long sentMaxPushId() {
        return sentMaxPushId;
    }

    @Override
    public void channelActive(ChannelHandlerContext ctx) {
        // We need to write 0x00 into the stream before doing anything else.
        // See https://tools.ietf.org/html/draft-ietf-quic-http-32#section-6.2.1
        // Just allocate 8 bytes which would be the max needed.
        ByteBuf buffer = ctx.alloc().buffer(8);
        Http3CodecUtils.writeVariableLengthInteger(buffer, Http3CodecUtils.HTTP3_CONTROL_STREAM_TYPE);
// ... (84 more lines)