2015-01-20 01:48:11 +01:00
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/*
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* Copyright 2014 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License, version 2.0 (the
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* "License"); you may not use this file except in compliance with the License. You may obtain a
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* copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software distributed under the License
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* is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
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* or implied. See the License for the specific language governing permissions and limitations under
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* the License.
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*/
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package io.netty.handler.codec.http2;
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import static io.netty.handler.codec.http2.Http2CodecUtil.HTTP_UPGRADE_STREAM_ID;
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import static io.netty.handler.codec.http2.Http2CodecUtil.connectionPrefaceBuf;
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import static io.netty.handler.codec.http2.Http2CodecUtil.getEmbeddedHttp2Exception;
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import static io.netty.handler.codec.http2.Http2Error.INTERNAL_ERROR;
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import static io.netty.handler.codec.http2.Http2Error.NO_ERROR;
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import static io.netty.handler.codec.http2.Http2Error.PROTOCOL_ERROR;
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import static io.netty.handler.codec.http2.Http2Exception.connectionError;
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import static io.netty.handler.codec.http2.Http2Exception.isStreamError;
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import static io.netty.util.internal.ObjectUtil.checkNotNull;
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import io.netty.buffer.ByteBuf;
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2015-03-23 18:52:11 +01:00
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import io.netty.buffer.ByteBufUtil;
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2015-01-20 01:48:11 +01:00
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import io.netty.channel.ChannelFuture;
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import io.netty.channel.ChannelFutureListener;
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import io.netty.channel.ChannelHandlerContext;
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import io.netty.channel.ChannelOutboundHandler;
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import io.netty.channel.ChannelPromise;
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import io.netty.handler.codec.ByteToMessageDecoder;
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import io.netty.handler.codec.http2.Http2Exception.CompositeStreamException;
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import io.netty.handler.codec.http2.Http2Exception.StreamException;
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import java.net.SocketAddress;
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import java.util.Collection;
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import java.util.List;
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/**
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2015-02-02 19:20:56 +01:00
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* Provides the default implementation for processing inbound frame events and delegates to a
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* {@link Http2FrameListener}
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2015-01-20 01:48:11 +01:00
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* <p>
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* This class will read HTTP/2 frames and delegate the events to a {@link Http2FrameListener}
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* <p>
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2015-02-02 19:20:56 +01:00
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* This interface enforces inbound flow control functionality through
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* {@link Http2LocalFlowController}
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2015-01-20 01:48:11 +01:00
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*/
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public class Http2ConnectionHandler extends ByteToMessageDecoder implements Http2LifecycleManager,
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ChannelOutboundHandler {
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private final Http2ConnectionDecoder decoder;
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private final Http2ConnectionEncoder encoder;
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private ChannelFutureListener closeListener;
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2015-03-23 18:52:11 +01:00
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private BaseDecoder byteDecoder;
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2015-01-20 01:48:11 +01:00
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public Http2ConnectionHandler(boolean server, Http2FrameListener listener) {
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this(new DefaultHttp2Connection(server), listener);
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}
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public Http2ConnectionHandler(Http2Connection connection, Http2FrameListener listener) {
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this(connection, new DefaultHttp2FrameReader(), new DefaultHttp2FrameWriter(), listener);
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}
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public Http2ConnectionHandler(Http2Connection connection, Http2FrameReader frameReader,
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2015-03-27 23:37:20 +01:00
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Http2FrameWriter frameWriter, Http2FrameListener listener) {
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encoder = new DefaultHttp2ConnectionEncoder(connection, frameWriter);
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decoder = new DefaultHttp2ConnectionDecoder(connection, encoder, frameReader, listener);
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2015-01-20 01:48:11 +01:00
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}
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/**
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2015-03-27 23:37:20 +01:00
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* Constructor for pre-configured encoder and decoder. Just sets the {@code this} as the
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2015-01-20 01:48:11 +01:00
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* {@link Http2LifecycleManager} and builds them.
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*/
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2015-03-27 23:37:20 +01:00
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public Http2ConnectionHandler(Http2ConnectionDecoder decoder,
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Http2ConnectionEncoder encoder) {
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this.decoder = checkNotNull(decoder, "decoder");
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this.encoder = checkNotNull(encoder, "encoder");
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2015-01-20 01:48:11 +01:00
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if (encoder.connection() != decoder.connection()) {
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throw new IllegalArgumentException("Encoder and Decoder do not share the same connection object");
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}
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}
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public Http2Connection connection() {
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return encoder.connection();
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}
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public Http2ConnectionDecoder decoder() {
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return decoder;
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}
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public Http2ConnectionEncoder encoder() {
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return encoder;
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}
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2015-03-23 18:52:11 +01:00
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private boolean prefaceSent() {
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return byteDecoder != null && byteDecoder.prefaceSent();
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}
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2015-01-20 01:48:11 +01:00
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/**
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* Handles the client-side (cleartext) upgrade from HTTP to HTTP/2.
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* Reserves local stream 1 for the HTTP/2 response.
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*/
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public void onHttpClientUpgrade() throws Http2Exception {
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if (connection().isServer()) {
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throw connectionError(PROTOCOL_ERROR, "Client-side HTTP upgrade requested for a server");
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}
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2015-03-23 18:52:11 +01:00
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if (prefaceSent() || decoder.prefaceReceived()) {
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throw connectionError(PROTOCOL_ERROR, "HTTP upgrade must occur before HTTP/2 preface is sent or received");
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}
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// Create a local stream used for the HTTP cleartext upgrade.
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2015-03-15 02:38:35 +01:00
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connection().local().createStream(HTTP_UPGRADE_STREAM_ID).open(true);
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2015-01-20 01:48:11 +01:00
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}
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/**
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* Handles the server-side (cleartext) upgrade from HTTP to HTTP/2.
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* @param settings the settings for the remote endpoint.
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*/
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public void onHttpServerUpgrade(Http2Settings settings) throws Http2Exception {
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if (!connection().isServer()) {
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throw connectionError(PROTOCOL_ERROR, "Server-side HTTP upgrade requested for a client");
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}
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2015-03-23 18:52:11 +01:00
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if (prefaceSent() || decoder.prefaceReceived()) {
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2015-01-20 01:48:11 +01:00
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throw connectionError(PROTOCOL_ERROR, "HTTP upgrade must occur before HTTP/2 preface is sent or received");
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}
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// Apply the settings but no ACK is necessary.
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encoder.remoteSettings(settings);
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// Create a stream in the half-closed state.
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2015-03-15 02:38:35 +01:00
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connection().remote().createStream(HTTP_UPGRADE_STREAM_ID).open(true);
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2015-01-20 01:48:11 +01:00
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}
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2015-03-23 18:52:11 +01:00
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private abstract class BaseDecoder {
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public abstract void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) throws Exception;
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public void handlerRemoved(ChannelHandlerContext ctx) throws Exception { }
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public void channelActive(ChannelHandlerContext ctx) throws Exception { }
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public void channelInactive(ChannelHandlerContext ctx) throws Exception {
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try {
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ChannelFuture future = ctx.newSucceededFuture();
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final Collection<Http2Stream> streams = connection().activeStreams();
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for (Http2Stream s : streams.toArray(new Http2Stream[streams.size()])) {
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closeStream(s, future);
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}
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} finally {
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try {
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encoder().close();
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} finally {
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decoder().close();
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}
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}
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}
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/**
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* Determine if the HTTP/2 connection preface been sent.
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*/
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public boolean prefaceSent() {
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return true;
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}
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}
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private final class PrefaceDecoder extends BaseDecoder {
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private ByteBuf clientPrefaceString;
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private boolean prefaceSent;
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public PrefaceDecoder(ChannelHandlerContext ctx) {
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clientPrefaceString = clientPrefaceString(encoder.connection());
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// This handler was just added to the context. In case it was handled after
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// the connection became active, send the connection preface now.
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sendPreface(ctx);
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}
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@Override
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public boolean prefaceSent() {
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return prefaceSent;
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}
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@Override
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public void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) throws Exception {
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try {
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if (readClientPrefaceString(in)) {
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// After the preface is read, it is time to hand over control to the post initialized decoder.
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Http2ConnectionHandler.this.byteDecoder = new FrameDecoder();
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Http2ConnectionHandler.this.byteDecoder.decode(ctx, in, out);
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}
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} catch (Throwable e) {
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onException(ctx, e);
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}
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}
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@Override
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public void channelActive(ChannelHandlerContext ctx) throws Exception {
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// The channel just became active - send the connection preface to the remote endpoint.
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sendPreface(ctx);
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}
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@Override
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public void channelInactive(ChannelHandlerContext ctx) throws Exception {
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cleanup();
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super.channelInactive(ctx);
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}
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/**
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* Releases the {@code clientPrefaceString}. Any active streams will be left in the open.
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*/
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@Override
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public void handlerRemoved(ChannelHandlerContext ctx) throws Exception {
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cleanup();
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}
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/**
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* Releases the {@code clientPrefaceString}. Any active streams will be left in the open.
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*/
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private void cleanup() {
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if (clientPrefaceString != null) {
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clientPrefaceString.release();
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clientPrefaceString = null;
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}
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}
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/**
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* Decodes the client connection preface string from the input buffer.
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*
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* @return {@code true} if processing of the client preface string is complete. Since client preface strings can
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* only be received by servers, returns true immediately for client endpoints.
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*/
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private boolean readClientPrefaceString(ByteBuf in) throws Http2Exception {
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if (clientPrefaceString == null) {
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return true;
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}
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int prefaceRemaining = clientPrefaceString.readableBytes();
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int bytesRead = Math.min(in.readableBytes(), prefaceRemaining);
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// If the input so far doesn't match the preface, break the connection.
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if (bytesRead == 0 || !ByteBufUtil.equals(in, in.readerIndex(),
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clientPrefaceString, clientPrefaceString.readerIndex(), bytesRead)) {
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throw connectionError(PROTOCOL_ERROR, "HTTP/2 client preface string missing or corrupt.");
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}
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in.skipBytes(bytesRead);
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clientPrefaceString.skipBytes(bytesRead);
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if (!clientPrefaceString.isReadable()) {
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// Entire preface has been read.
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clientPrefaceString.release();
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clientPrefaceString = null;
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return true;
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}
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return false;
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}
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/**
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* Sends the HTTP/2 connection preface upon establishment of the connection, if not already sent.
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*/
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private void sendPreface(ChannelHandlerContext ctx) {
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if (prefaceSent || !ctx.channel().isActive()) {
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return;
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}
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prefaceSent = true;
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if (!connection().isServer()) {
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// Clients must send the preface string as the first bytes on the connection.
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ctx.write(connectionPrefaceBuf()).addListener(ChannelFutureListener.CLOSE_ON_FAILURE);
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}
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// Both client and server must send their initial settings.
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encoder.writeSettings(ctx, decoder.localSettings(), ctx.newPromise()).addListener(
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ChannelFutureListener.CLOSE_ON_FAILURE);
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}
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}
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private final class FrameDecoder extends BaseDecoder {
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@Override
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public void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) throws Exception {
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try {
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decoder.decodeFrame(ctx, in, out);
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} catch (Throwable e) {
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onException(ctx, e);
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}
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}
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2015-01-20 01:48:11 +01:00
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}
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@Override
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public void handlerAdded(ChannelHandlerContext ctx) throws Exception {
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2015-03-27 23:37:20 +01:00
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// Initialize the encoder and decoder.
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encoder.lifecycleManager(this);
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decoder.lifecycleManager(this);
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2015-03-23 18:52:11 +01:00
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byteDecoder = new PrefaceDecoder(ctx);
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}
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@Override
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protected void handlerRemoved0(ChannelHandlerContext ctx) throws Exception {
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2015-03-23 18:52:11 +01:00
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if (byteDecoder != null) {
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byteDecoder.handlerRemoved(ctx);
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byteDecoder = null;
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}
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}
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@Override
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public void channelActive(ChannelHandlerContext ctx) throws Exception {
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if (byteDecoder == null) {
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byteDecoder = new PrefaceDecoder(ctx);
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2015-03-18 22:09:19 +01:00
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}
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2015-03-23 18:52:11 +01:00
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byteDecoder.channelActive(ctx);
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}
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@Override
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public void channelInactive(ChannelHandlerContext ctx) throws Exception {
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if (byteDecoder != null) {
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byteDecoder.channelInactive(ctx);
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byteDecoder = null;
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}
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}
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@Override
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protected void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) throws Exception {
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byteDecoder.decode(ctx, in, out);
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2015-01-20 01:48:11 +01:00
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}
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@Override
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public void bind(ChannelHandlerContext ctx, SocketAddress localAddress, ChannelPromise promise) throws Exception {
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ctx.bind(localAddress, promise);
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}
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@Override
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public void connect(ChannelHandlerContext ctx, SocketAddress remoteAddress, SocketAddress localAddress,
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ChannelPromise promise) throws Exception {
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ctx.connect(remoteAddress, localAddress, promise);
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}
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@Override
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public void disconnect(ChannelHandlerContext ctx, ChannelPromise promise) throws Exception {
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ctx.disconnect(promise);
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}
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@Override
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public void close(ChannelHandlerContext ctx, ChannelPromise promise) throws Exception {
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// Avoid NotYetConnectedException
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if (!ctx.channel().isActive()) {
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ctx.close(promise);
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return;
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}
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ChannelFuture future = writeGoAway(ctx, null);
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// If there are no active streams, close immediately after the send is complete.
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// Otherwise wait until all streams are inactive.
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if (connection().numActiveStreams() == 0) {
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future.addListener(new ClosingChannelFutureListener(ctx, promise));
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} else {
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closeListener = new ClosingChannelFutureListener(ctx, promise);
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}
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}
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|
|
|
|
@Override
|
|
|
|
public void deregister(ChannelHandlerContext ctx, ChannelPromise promise) throws Exception {
|
|
|
|
ctx.deregister(promise);
|
|
|
|
}
|
|
|
|
|
|
|
|
@Override
|
|
|
|
public void read(ChannelHandlerContext ctx) throws Exception {
|
|
|
|
ctx.read();
|
|
|
|
}
|
|
|
|
|
|
|
|
@Override
|
|
|
|
public void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) throws Exception {
|
|
|
|
ctx.write(msg, promise);
|
|
|
|
}
|
|
|
|
|
|
|
|
@Override
|
|
|
|
public void flush(ChannelHandlerContext ctx) throws Exception {
|
|
|
|
ctx.flush();
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Handles {@link Http2Exception} objects that were thrown from other handlers. Ignores all other exceptions.
|
|
|
|
*/
|
|
|
|
@Override
|
|
|
|
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
|
|
|
|
if (getEmbeddedHttp2Exception(cause) != null) {
|
|
|
|
// Some exception in the causality chain is an Http2Exception - handle it.
|
|
|
|
onException(ctx, cause);
|
|
|
|
} else {
|
|
|
|
super.exceptionCaught(ctx, cause);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Closes the local side of the given stream. If this causes the stream to be closed, adds a
|
|
|
|
* hook to close the channel after the given future completes.
|
|
|
|
*
|
|
|
|
* @param stream the stream to be half closed.
|
|
|
|
* @param future If closing, the future after which to close the channel.
|
|
|
|
*/
|
|
|
|
@Override
|
|
|
|
public void closeLocalSide(Http2Stream stream, ChannelFuture future) {
|
|
|
|
switch (stream.state()) {
|
|
|
|
case HALF_CLOSED_LOCAL:
|
|
|
|
case OPEN:
|
|
|
|
stream.closeLocalSide();
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
closeStream(stream, future);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Closes the remote side of the given stream. If this causes the stream to be closed, adds a
|
|
|
|
* hook to close the channel after the given future completes.
|
|
|
|
*
|
|
|
|
* @param stream the stream to be half closed.
|
|
|
|
* @param future If closing, the future after which to close the channel.
|
|
|
|
*/
|
|
|
|
@Override
|
|
|
|
public void closeRemoteSide(Http2Stream stream, ChannelFuture future) {
|
|
|
|
switch (stream.state()) {
|
|
|
|
case HALF_CLOSED_REMOTE:
|
|
|
|
case OPEN:
|
|
|
|
stream.closeRemoteSide();
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
closeStream(stream, future);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Closes the given stream and adds a hook to close the channel after the given future
|
|
|
|
* completes.
|
|
|
|
*
|
|
|
|
* @param stream the stream to be closed.
|
|
|
|
* @param future the future after which to close the channel.
|
|
|
|
*/
|
|
|
|
@Override
|
2015-02-02 19:20:56 +01:00
|
|
|
public void closeStream(final Http2Stream stream, ChannelFuture future) {
|
2015-01-20 01:48:11 +01:00
|
|
|
stream.close();
|
|
|
|
|
2015-02-02 19:20:56 +01:00
|
|
|
future.addListener(new ChannelFutureListener() {
|
|
|
|
@Override
|
|
|
|
public void operationComplete(ChannelFuture future) throws Exception {
|
|
|
|
// If this connection is closing and there are no longer any
|
|
|
|
// active streams, close after the current operation completes.
|
|
|
|
if (closeListener != null && connection().numActiveStreams() == 0) {
|
2015-03-14 20:58:30 +01:00
|
|
|
ChannelFutureListener closeListener = Http2ConnectionHandler.this.closeListener;
|
|
|
|
// This method could be called multiple times
|
2015-03-23 18:52:11 +01:00
|
|
|
// and we don't want to notify the closeListener multiple times.
|
2015-03-14 20:58:30 +01:00
|
|
|
Http2ConnectionHandler.this.closeListener = null;
|
2015-02-02 19:20:56 +01:00
|
|
|
closeListener.operationComplete(future);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
});
|
2015-01-20 01:48:11 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Central handler for all exceptions caught during HTTP/2 processing.
|
|
|
|
*/
|
|
|
|
@Override
|
|
|
|
public void onException(ChannelHandlerContext ctx, Throwable cause) {
|
|
|
|
Http2Exception embedded = getEmbeddedHttp2Exception(cause);
|
|
|
|
if (isStreamError(embedded)) {
|
|
|
|
onStreamError(ctx, cause, (StreamException) embedded);
|
|
|
|
} else if (embedded instanceof CompositeStreamException) {
|
|
|
|
CompositeStreamException compositException = (CompositeStreamException) embedded;
|
|
|
|
for (StreamException streamException : compositException) {
|
|
|
|
onStreamError(ctx, cause, streamException);
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
onConnectionError(ctx, cause, embedded);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Handler for a connection error. Sends a GO_AWAY frame to the remote endpoint. Once all
|
|
|
|
* streams are closed, the connection is shut down.
|
|
|
|
*
|
|
|
|
* @param ctx the channel context
|
|
|
|
* @param cause the exception that was caught
|
|
|
|
* @param http2Ex the {@link Http2Exception} that is embedded in the causality chain. This may
|
|
|
|
* be {@code null} if it's an unknown exception.
|
|
|
|
*/
|
|
|
|
protected void onConnectionError(ChannelHandlerContext ctx, Throwable cause, Http2Exception http2Ex) {
|
|
|
|
if (http2Ex == null) {
|
|
|
|
http2Ex = new Http2Exception(INTERNAL_ERROR, cause.getMessage(), cause);
|
|
|
|
}
|
|
|
|
writeGoAway(ctx, http2Ex).addListener(new ClosingChannelFutureListener(ctx, ctx.newPromise()));
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Handler for a stream error. Sends a {@code RST_STREAM} frame to the remote endpoint and closes the
|
|
|
|
* stream.
|
|
|
|
*
|
|
|
|
* @param ctx the channel context
|
|
|
|
* @param cause the exception that was caught
|
|
|
|
* @param http2Ex the {@link StreamException} that is embedded in the causality chain.
|
|
|
|
*/
|
|
|
|
protected void onStreamError(ChannelHandlerContext ctx, Throwable cause, StreamException http2Ex) {
|
|
|
|
writeRstStream(ctx, http2Ex.streamId(), http2Ex.error().code(), ctx.newPromise());
|
|
|
|
}
|
|
|
|
|
|
|
|
protected Http2FrameWriter frameWriter() {
|
|
|
|
return encoder().frameWriter();
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Writes a {@code RST_STREAM} frame to the remote endpoint and updates the connection state appropriately.
|
|
|
|
*/
|
|
|
|
@Override
|
2015-03-14 20:58:30 +01:00
|
|
|
public ChannelFuture writeRstStream(final ChannelHandlerContext ctx, int streamId, long errorCode,
|
|
|
|
final ChannelPromise promise) {
|
|
|
|
final Http2Stream stream = connection().stream(streamId);
|
|
|
|
if (stream == null || stream.isResetSent()) {
|
|
|
|
// Don't write a RST_STREAM frame if we are not aware of the stream, or if we have already written one.
|
|
|
|
return promise.setSuccess();
|
|
|
|
}
|
|
|
|
|
2015-01-20 01:48:11 +01:00
|
|
|
ChannelFuture future = frameWriter().writeRstStream(ctx, streamId, errorCode, promise);
|
|
|
|
ctx.flush();
|
|
|
|
|
2015-03-14 20:58:30 +01:00
|
|
|
// Synchronously set the resetSent flag to prevent any subsequent calls
|
|
|
|
// from resulting in multiple reset frames being sent.
|
|
|
|
stream.resetSent();
|
|
|
|
|
|
|
|
future.addListener(new ChannelFutureListener() {
|
|
|
|
@Override
|
|
|
|
public void operationComplete(ChannelFuture future) throws Exception {
|
|
|
|
if (future.isSuccess()) {
|
|
|
|
closeStream(stream, promise);
|
|
|
|
} else {
|
|
|
|
// The connection will be closed and so no need to change the resetSent flag to false.
|
|
|
|
onConnectionError(ctx, future.cause(), null);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
});
|
2015-01-20 01:48:11 +01:00
|
|
|
|
|
|
|
return future;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Sends a {@code GO_AWAY} frame to the remote endpoint and updates the connection state appropriately.
|
|
|
|
*/
|
|
|
|
@Override
|
|
|
|
public ChannelFuture writeGoAway(ChannelHandlerContext ctx, int lastStreamId, long errorCode, ByteBuf debugData,
|
|
|
|
ChannelPromise promise) {
|
|
|
|
Http2Connection connection = connection();
|
|
|
|
if (connection.isGoAway()) {
|
|
|
|
debugData.release();
|
|
|
|
return ctx.newSucceededFuture();
|
|
|
|
}
|
|
|
|
|
|
|
|
ChannelFuture future = frameWriter().writeGoAway(ctx, lastStreamId, errorCode, debugData, promise);
|
|
|
|
ctx.flush();
|
|
|
|
|
|
|
|
connection.goAwaySent(lastStreamId);
|
|
|
|
return future;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Sends a {@code GO_AWAY} frame appropriate for the given exception.
|
|
|
|
*/
|
|
|
|
private ChannelFuture writeGoAway(ChannelHandlerContext ctx, Http2Exception cause) {
|
|
|
|
Http2Connection connection = connection();
|
|
|
|
if (connection.isGoAway()) {
|
|
|
|
return ctx.newSucceededFuture();
|
|
|
|
}
|
|
|
|
|
|
|
|
// The connection isn't alredy going away, send the GO_AWAY frame now to start
|
|
|
|
// the process.
|
|
|
|
long errorCode = cause != null ? cause.error().code() : NO_ERROR.code();
|
|
|
|
ByteBuf debugData = Http2CodecUtil.toByteBuf(ctx, cause);
|
|
|
|
int lastKnownStream = connection.remote().lastStreamCreated();
|
|
|
|
return writeGoAway(ctx, lastKnownStream, errorCode, debugData, ctx.newPromise());
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Returns the client preface string if this is a client connection, otherwise returns {@code null}.
|
|
|
|
*/
|
|
|
|
private static ByteBuf clientPrefaceString(Http2Connection connection) {
|
|
|
|
return connection.isServer() ? connectionPrefaceBuf() : null;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Closes the channel when the future completes.
|
|
|
|
*/
|
|
|
|
private static final class ClosingChannelFutureListener implements ChannelFutureListener {
|
|
|
|
private final ChannelHandlerContext ctx;
|
|
|
|
private final ChannelPromise promise;
|
|
|
|
|
|
|
|
ClosingChannelFutureListener(ChannelHandlerContext ctx, ChannelPromise promise) {
|
|
|
|
this.ctx = ctx;
|
|
|
|
this.promise = promise;
|
|
|
|
}
|
|
|
|
|
|
|
|
@Override
|
|
|
|
public void operationComplete(ChannelFuture sentGoAwayFuture) throws Exception {
|
|
|
|
ctx.close(promise);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|