Http2MultiplexCodec.java — netty Source File

Source Code

/*
 * Copyright 2016 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.channel.Channel;
import io.netty.channel.ChannelConfig;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelHandler;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelPromise;
import io.netty.channel.EventLoop;
import io.netty.channel.socket.ChannelInputShutdownReadComplete;
import io.netty.channel.socket.ChannelOutputShutdownEvent;
import io.netty.handler.ssl.SslCloseCompletionEvent;
import io.netty.util.ReferenceCounted;

import java.util.ArrayDeque;
import java.util.Queue;

import static io.netty.handler.codec.http2.AbstractHttp2StreamChannel.CHANNEL_INPUT_SHUTDOWN_READ_COMPLETE_VISITOR;
import static io.netty.handler.codec.http2.AbstractHttp2StreamChannel.CHANNEL_OUTPUT_SHUTDOWN_EVENT_VISITOR;
import static io.netty.handler.codec.http2.AbstractHttp2StreamChannel.SSL_CLOSE_COMPLETION_EVENT_VISITOR;
import static io.netty.handler.codec.http2.Http2CodecUtil.HTTP_UPGRADE_STREAM_ID;
import static io.netty.handler.codec.http2.Http2Error.INTERNAL_ERROR;
import static io.netty.handler.codec.http2.Http2Exception.connectionError;

/**
 * An HTTP/2 handler that creates child channels for each stream.
 *
 * <p>When a new stream is created, a new {@link Channel} is created for it. Applications send and
 * receive {@link Http2StreamFrame}s on the created channel. {@link ByteBuf}s cannot be processed by the channel;
 * all writes that reach the head of the pipeline must be an instance of {@link Http2StreamFrame}. Writes that reach
 * the head of the pipeline are processed directly by this handler and cannot be intercepted.
 *
 * <p>The child channel will be notified of user events that impact the stream, such as {@link
 * Http2GoAwayFrame} and {@link Http2ResetFrame}, as soon as they occur. Although {@code
 * Http2GoAwayFrame} and {@code Http2ResetFrame} signify that the remote is ignoring further
 * communication, closing of the channel is delayed until any inbound queue is drained with {@link
 * Channel#read()}, which follows the default behavior of channels in Netty. Applications are
 * free to close the channel in response to such events if they don't have use for any queued
 * messages. Any connection level events like {@link Http2SettingsFrame} and {@link Http2GoAwayFrame}
 * will be processed internally and also propagated down the pipeline for other handlers to act on.
 *
 * <p>Outbound streams are supported via the {@link Http2StreamChannelBootstrap}.
 *
 * <p>{@link ChannelConfig#setMaxMessagesPerRead(int)} and {@link ChannelConfig#setAutoRead(boolean)} are supported.
// ... (285 more lines)