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 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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2015-08-18 19:36:16 +02:00
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import io.netty.util.concurrent.ScheduledFuture;
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2016-04-12 14:22:41 +02:00
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import io.netty.util.internal.UnstableApi;
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2015-03-20 02:36:24 +01:00
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import io.netty.util.internal.logging.InternalLogger;
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import io.netty.util.internal.logging.InternalLoggerFactory;
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2015-01-20 01:48:11 +01:00
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import java.net.SocketAddress;
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import java.util.List;
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2015-08-18 19:36:16 +02:00
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import java.util.concurrent.TimeUnit;
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import static io.netty.buffer.ByteBufUtil.hexDump;
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2016-06-01 23:42:17 +02:00
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import static io.netty.buffer.Unpooled.EMPTY_BUFFER;
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2015-08-18 19:36:16 +02:00
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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.handler.codec.http2.Http2FrameTypes.SETTINGS;
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2015-11-20 21:12:16 +01:00
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import static io.netty.handler.codec.http2.Http2Stream.State.IDLE;
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2015-08-18 19:36:16 +02:00
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import static io.netty.util.CharsetUtil.UTF_8;
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import static io.netty.util.internal.ObjectUtil.checkNotNull;
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import static java.lang.Math.min;
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import static java.util.concurrent.TimeUnit.MILLISECONDS;
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2015-01-20 01:48:11 +01:00
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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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2016-04-12 14:22:41 +02:00
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@UnstableApi
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2015-01-20 01:48:11 +01:00
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public class Http2ConnectionHandler extends ByteToMessageDecoder implements Http2LifecycleManager,
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2015-12-16 06:10:28 +01:00
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ChannelOutboundHandler {
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2015-04-09 21:30:16 +02:00
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private static final InternalLogger logger = InternalLoggerFactory.getInstance(Http2ConnectionHandler.class);
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2015-08-18 19:36:16 +02:00
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2015-01-20 01:48:11 +01:00
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private final Http2ConnectionDecoder decoder;
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private final Http2ConnectionEncoder encoder;
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2015-05-21 21:12:29 +02:00
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private final Http2Settings initialSettings;
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2015-01-20 01:48:11 +01:00
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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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2015-09-27 02:44:11 +02:00
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private long gracefulShutdownTimeoutMillis;
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2015-01-20 01:48:11 +01:00
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2015-09-27 02:44:11 +02:00
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protected Http2ConnectionHandler(Http2ConnectionDecoder decoder, Http2ConnectionEncoder encoder,
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Http2Settings initialSettings) {
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this.initialSettings = checkNotNull(initialSettings, "initialSettings");
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2015-03-27 23:37:20 +01:00
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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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2015-08-18 19:36:16 +02:00
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/**
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* Get the amount of time (in milliseconds) this endpoint will wait for all streams to be closed before closing
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* the connection during the graceful shutdown process.
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*/
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public long gracefulShutdownTimeoutMillis() {
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return gracefulShutdownTimeoutMillis;
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}
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/**
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* Set the amount of time (in milliseconds) this endpoint will wait for all streams to be closed before closing
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* the connection during the graceful shutdown process.
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* @param gracefulShutdownTimeoutMillis the amount of time (in milliseconds) this endpoint will wait for all
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* streams to be closed before closing the connection during the graceful shutdown process.
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*/
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public void gracefulShutdownTimeoutMillis(long gracefulShutdownTimeoutMillis) {
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if (gracefulShutdownTimeoutMillis < 0) {
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throw new IllegalArgumentException("gracefulShutdownTimeoutMillis: " + gracefulShutdownTimeoutMillis +
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" (expected: >= 0)");
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}
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this.gracefulShutdownTimeoutMillis = gracefulShutdownTimeoutMillis;
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}
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2015-01-20 01:48:11 +01:00
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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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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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// Create a local stream used for the HTTP cleartext upgrade.
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2015-04-22 23:35:31 +02:00
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connection().local().createStream(HTTP_UPGRADE_STREAM_ID, 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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2015-04-22 23:35:31 +02:00
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connection().remote().createStream(HTTP_UPGRADE_STREAM_ID, true);
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2015-01-20 01:48:11 +01:00
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}
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2015-06-04 20:55:18 +02:00
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@Override
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public void flush(ChannelHandlerContext ctx) throws Http2Exception {
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// Trigger pending writes in the remote flow controller.
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2015-08-03 21:46:29 +02:00
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encoder.flowController().writePendingBytes();
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2015-06-04 20:55:18 +02:00
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try {
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2015-06-20 01:08:37 +02:00
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ctx.flush();
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2015-06-04 20:55:18 +02:00
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} catch (Throwable t) {
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throw new Http2Exception(INTERNAL_ERROR, "Error flushing" , t);
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}
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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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2015-07-08 20:38:22 +02:00
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// Connection has terminated, close the encoder and decoder.
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encoder().close();
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decoder().close();
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2016-02-06 04:02:49 +01:00
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// We need to remove all streams (not just the active ones).
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// See https://github.com/netty/netty/issues/4838.
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connection().close(ctx.voidPromise());
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2015-03-23 18:52:11 +01:00
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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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2016-02-18 23:02:17 +01:00
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if (ctx.channel().isActive() && readClientPrefaceString(in) && verifyFirstFrameIsSettings(in)) {
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2015-03-23 18:52:11 +01:00
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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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2015-06-17 00:11:28 +02:00
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byteDecoder = new FrameDecoder();
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byteDecoder.decode(ctx, in, out);
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2015-03-23 18:52:11 +01:00
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}
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} catch (Throwable e) {
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2015-09-16 00:33:17 +02:00
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onError(ctx, e);
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2015-03-23 18:52:11 +01:00
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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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2015-06-17 00:11:28 +02:00
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int bytesRead = min(in.readableBytes(), prefaceRemaining);
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2015-03-23 18:52:11 +01:00
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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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2015-06-17 00:11:28 +02:00
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String receivedBytes = hexDump(in, in.readerIndex(),
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min(in.readableBytes(), clientPrefaceString.readableBytes()));
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throw connectionError(PROTOCOL_ERROR, "HTTP/2 client preface string missing or corrupt. " +
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"Hex dump for received bytes: %s", receivedBytes);
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2015-03-23 18:52:11 +01:00
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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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2015-06-17 00:11:28 +02:00
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/**
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2015-11-02 10:42:36 +01:00
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* Peeks at that the next frame in the buffer and verifies that it is a non-ack {@code SETTINGS} frame.
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2015-06-17 00:11:28 +02:00
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*
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* @param in the inbound buffer.
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2015-11-02 10:42:36 +01:00
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* @return {@code} true if the next frame is a non-ack {@code SETTINGS} frame, {@code false} if more
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2015-06-17 00:11:28 +02:00
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* data is required before we can determine the next frame type.
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2015-11-02 10:42:36 +01:00
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* @throws Http2Exception thrown if the next frame is NOT a non-ack {@code SETTINGS} frame.
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2015-06-17 00:11:28 +02:00
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*/
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private boolean verifyFirstFrameIsSettings(ByteBuf in) throws Http2Exception {
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2015-11-02 10:42:36 +01:00
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if (in.readableBytes() < 5) {
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2015-06-17 00:11:28 +02:00
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// Need more data before we can see the frame type for the first frame.
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return false;
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}
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2015-11-02 10:42:36 +01:00
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short frameType = in.getUnsignedByte(in.readerIndex() + 3);
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short flags = in.getUnsignedByte(in.readerIndex() + 4);
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if (frameType != SETTINGS || (flags & Http2Flags.ACK) != 0) {
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2015-06-17 00:11:28 +02:00
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throw connectionError(PROTOCOL_ERROR, "First received frame was not SETTINGS. " +
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2015-11-02 10:42:36 +01:00
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"Hex dump for first 5 bytes: %s", hexDump(in, in.readerIndex(), 5));
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2015-06-17 00:11:28 +02:00
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}
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return true;
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}
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2015-03-23 18:52:11 +01:00
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/**
|
|
|
|
* Sends the HTTP/2 connection preface upon establishment of the connection, if not already sent.
|
|
|
|
*/
|
|
|
|
private void sendPreface(ChannelHandlerContext ctx) {
|
|
|
|
if (prefaceSent || !ctx.channel().isActive()) {
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
prefaceSent = true;
|
|
|
|
|
|
|
|
if (!connection().isServer()) {
|
|
|
|
// Clients must send the preface string as the first bytes on the connection.
|
|
|
|
ctx.write(connectionPrefaceBuf()).addListener(ChannelFutureListener.CLOSE_ON_FAILURE);
|
|
|
|
}
|
|
|
|
|
|
|
|
// Both client and server must send their initial settings.
|
2015-09-27 02:44:11 +02:00
|
|
|
encoder.writeSettings(ctx, initialSettings, ctx.newPromise()).addListener(
|
2015-03-23 18:52:11 +01:00
|
|
|
ChannelFutureListener.CLOSE_ON_FAILURE);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
private final class FrameDecoder extends BaseDecoder {
|
|
|
|
@Override
|
|
|
|
public void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) throws Exception {
|
|
|
|
try {
|
|
|
|
decoder.decodeFrame(ctx, in, out);
|
|
|
|
} catch (Throwable e) {
|
2015-09-16 00:33:17 +02:00
|
|
|
onError(ctx, e);
|
2015-03-23 18:52:11 +01:00
|
|
|
}
|
|
|
|
}
|
2015-01-20 01:48:11 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
@Override
|
|
|
|
public void handlerAdded(ChannelHandlerContext ctx) throws Exception {
|
2015-06-30 19:10:17 +02:00
|
|
|
// Initialize the encoder, decoder, flow controllers, and internal state.
|
2015-03-27 23:37:20 +01:00
|
|
|
encoder.lifecycleManager(this);
|
|
|
|
decoder.lifecycleManager(this);
|
2015-06-30 19:10:17 +02:00
|
|
|
encoder.flowController().channelHandlerContext(ctx);
|
|
|
|
decoder.flowController().channelHandlerContext(ctx);
|
2015-03-23 18:52:11 +01:00
|
|
|
byteDecoder = new PrefaceDecoder(ctx);
|
2015-01-20 01:48:11 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
@Override
|
|
|
|
protected void handlerRemoved0(ChannelHandlerContext ctx) throws Exception {
|
2015-03-23 18:52:11 +01:00
|
|
|
if (byteDecoder != null) {
|
|
|
|
byteDecoder.handlerRemoved(ctx);
|
|
|
|
byteDecoder = null;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
@Override
|
|
|
|
public void channelActive(ChannelHandlerContext ctx) throws Exception {
|
|
|
|
if (byteDecoder == null) {
|
|
|
|
byteDecoder = new PrefaceDecoder(ctx);
|
2015-03-18 22:09:19 +01:00
|
|
|
}
|
2015-03-23 18:52:11 +01:00
|
|
|
byteDecoder.channelActive(ctx);
|
2015-04-29 01:27:54 +02:00
|
|
|
super.channelActive(ctx);
|
2015-03-23 18:52:11 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
@Override
|
|
|
|
public void channelInactive(ChannelHandlerContext ctx) throws Exception {
|
2015-08-21 04:23:37 +02:00
|
|
|
// Call super class first, as this may result in decode being called.
|
|
|
|
super.channelInactive(ctx);
|
2015-03-23 18:52:11 +01:00
|
|
|
if (byteDecoder != null) {
|
|
|
|
byteDecoder.channelInactive(ctx);
|
|
|
|
byteDecoder = null;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2015-06-30 19:10:17 +02:00
|
|
|
@Override
|
|
|
|
public void channelWritabilityChanged(ChannelHandlerContext ctx) throws Exception {
|
|
|
|
// Writability is expected to change while we are writing. We cannot allow this event to trigger reentering
|
|
|
|
// the allocation and write loop. Reentering the event loop will lead to over or illegal allocation.
|
2015-08-03 21:46:29 +02:00
|
|
|
try {
|
|
|
|
if (ctx.channel().isWritable()) {
|
|
|
|
flush(ctx);
|
|
|
|
}
|
2015-09-26 00:49:05 +02:00
|
|
|
encoder.flowController().channelWritabilityChanged();
|
2015-08-03 21:46:29 +02:00
|
|
|
} finally {
|
|
|
|
super.channelWritabilityChanged(ctx);
|
2015-06-30 19:10:17 +02:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2015-03-23 18:52:11 +01:00
|
|
|
@Override
|
|
|
|
protected void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) throws Exception {
|
|
|
|
byteDecoder.decode(ctx, in, out);
|
2015-01-20 01:48:11 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
@Override
|
|
|
|
public void bind(ChannelHandlerContext ctx, SocketAddress localAddress, ChannelPromise promise) throws Exception {
|
|
|
|
ctx.bind(localAddress, promise);
|
|
|
|
}
|
|
|
|
|
|
|
|
@Override
|
|
|
|
public void connect(ChannelHandlerContext ctx, SocketAddress remoteAddress, SocketAddress localAddress,
|
|
|
|
ChannelPromise promise) throws Exception {
|
|
|
|
ctx.connect(remoteAddress, localAddress, promise);
|
|
|
|
}
|
|
|
|
|
|
|
|
@Override
|
|
|
|
public void disconnect(ChannelHandlerContext ctx, ChannelPromise promise) throws Exception {
|
|
|
|
ctx.disconnect(promise);
|
|
|
|
}
|
|
|
|
|
|
|
|
@Override
|
|
|
|
public void close(ChannelHandlerContext ctx, ChannelPromise promise) throws Exception {
|
|
|
|
// Avoid NotYetConnectedException
|
|
|
|
if (!ctx.channel().isActive()) {
|
|
|
|
ctx.close(promise);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
2016-06-01 23:42:17 +02:00
|
|
|
// If the user has already sent a GO_AWAY frame they may be attempting to do a graceful shutdown which requires
|
|
|
|
// sending multiple GO_AWAY frames. We should only send a GO_AWAY here if one has not already been sent. If
|
|
|
|
// a GO_AWAY has been sent we send a empty buffer just so we can wait to close until all other data has been
|
|
|
|
// flushed to the OS.
|
|
|
|
// https://github.com/netty/netty/issues/5307
|
|
|
|
final ChannelFuture future = connection().goAwaySent() ? ctx.write(EMPTY_BUFFER) : goAway(ctx, null);
|
2015-04-23 23:23:23 +02:00
|
|
|
ctx.flush();
|
2015-08-18 19:36:16 +02:00
|
|
|
doGracefulShutdown(ctx, future, promise);
|
|
|
|
}
|
2015-01-20 01:48:11 +01:00
|
|
|
|
2015-08-18 19:36:16 +02:00
|
|
|
private void doGracefulShutdown(ChannelHandlerContext ctx, ChannelFuture future, ChannelPromise promise) {
|
2015-05-06 21:04:55 +02:00
|
|
|
if (isGracefulShutdownComplete()) {
|
2016-06-01 23:42:17 +02:00
|
|
|
// If there are no active streams, close immediately after the GO_AWAY write completes.
|
2015-01-20 01:48:11 +01:00
|
|
|
future.addListener(new ClosingChannelFutureListener(ctx, promise));
|
|
|
|
} else {
|
2016-06-01 23:42:17 +02:00
|
|
|
// If there are active streams we should wait until they are all closed before closing the connection.
|
2015-08-18 19:36:16 +02:00
|
|
|
closeListener = new ClosingChannelFutureListener(ctx, promise,
|
|
|
|
gracefulShutdownTimeoutMillis, MILLISECONDS);
|
2015-01-20 01:48:11 +01:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2015-04-29 07:51:32 +02:00
|
|
|
@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);
|
|
|
|
}
|
|
|
|
|
2015-04-23 23:23:23 +02:00
|
|
|
@Override
|
|
|
|
public void channelReadComplete(ChannelHandlerContext ctx) throws Exception {
|
|
|
|
// Trigger flush after read on the assumption that flush is cheap if there is nothing to write and that
|
|
|
|
// for flow-control the read may release window that causes data to be written that can now be flushed.
|
2015-07-07 17:14:12 +02:00
|
|
|
try {
|
|
|
|
flush(ctx);
|
|
|
|
} finally {
|
|
|
|
super.channelReadComplete(ctx);
|
|
|
|
}
|
2015-04-23 23:23:23 +02:00
|
|
|
}
|
|
|
|
|
2015-01-20 01:48:11 +01:00
|
|
|
/**
|
|
|
|
* 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.
|
2015-09-16 00:33:17 +02:00
|
|
|
onError(ctx, cause);
|
2015-01-20 01:48:11 +01:00
|
|
|
} 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
|
2015-04-02 23:39:46 +02:00
|
|
|
public void closeStreamLocal(Http2Stream stream, ChannelFuture future) {
|
2015-01-20 01:48:11 +01:00
|
|
|
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
|
2015-04-02 23:39:46 +02:00
|
|
|
public void closeStreamRemote(Http2Stream stream, ChannelFuture future) {
|
2015-01-20 01:48:11 +01:00
|
|
|
switch (stream.state()) {
|
|
|
|
case HALF_CLOSED_REMOTE:
|
|
|
|
case OPEN:
|
|
|
|
stream.closeRemoteSide();
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
closeStream(stream, future);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
@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();
|
|
|
|
|
2015-05-30 01:27:59 +02:00
|
|
|
if (future.isDone()) {
|
|
|
|
checkCloseConnection(future);
|
|
|
|
} else {
|
|
|
|
future.addListener(new ChannelFutureListener() {
|
|
|
|
@Override
|
|
|
|
public void operationComplete(ChannelFuture future) throws Exception {
|
|
|
|
checkCloseConnection(future);
|
2015-05-06 21:04:55 +02:00
|
|
|
}
|
2015-05-30 01:27:59 +02:00
|
|
|
});
|
|
|
|
}
|
2015-01-20 01:48:11 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Central handler for all exceptions caught during HTTP/2 processing.
|
|
|
|
*/
|
|
|
|
@Override
|
2015-09-16 00:33:17 +02:00
|
|
|
public void onError(ChannelHandlerContext ctx, Throwable cause) {
|
2015-01-20 01:48:11 +01:00
|
|
|
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);
|
|
|
|
}
|
2015-04-23 23:23:23 +02:00
|
|
|
ctx.flush();
|
2015-01-20 01:48:11 +01:00
|
|
|
}
|
|
|
|
|
2015-05-06 21:04:55 +02:00
|
|
|
/**
|
|
|
|
* Called by the graceful shutdown logic to determine when it is safe to close the connection. Returns {@code true}
|
|
|
|
* if the graceful shutdown has completed and the connection can be safely closed. This implementation just
|
|
|
|
* guarantees that there are no active streams. Subclasses may override to provide additional checks.
|
|
|
|
*/
|
|
|
|
protected boolean isGracefulShutdownComplete() {
|
|
|
|
return connection().numActiveStreams() == 0;
|
|
|
|
}
|
|
|
|
|
2015-01-20 01:48:11 +01:00
|
|
|
/**
|
|
|
|
* 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);
|
|
|
|
}
|
2015-08-18 19:36:16 +02:00
|
|
|
|
|
|
|
ChannelPromise promise = ctx.newPromise();
|
|
|
|
ChannelFuture future = goAway(ctx, http2Ex);
|
|
|
|
switch (http2Ex.shutdownHint()) {
|
|
|
|
case GRACEFUL_SHUTDOWN:
|
|
|
|
doGracefulShutdown(ctx, future, promise);
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
future.addListener(new ClosingChannelFutureListener(ctx, promise));
|
|
|
|
break;
|
|
|
|
}
|
2015-01-20 01:48:11 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* 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.
|
|
|
|
*/
|
2015-10-30 17:14:52 +01:00
|
|
|
protected void onStreamError(ChannelHandlerContext ctx, @SuppressWarnings("unused") Throwable cause,
|
|
|
|
StreamException http2Ex) {
|
2015-04-02 23:39:46 +02:00
|
|
|
resetStream(ctx, http2Ex.streamId(), http2Ex.error().code(), ctx.newPromise());
|
2015-01-20 01:48:11 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
protected Http2FrameWriter frameWriter() {
|
|
|
|
return encoder().frameWriter();
|
|
|
|
}
|
|
|
|
|
|
|
|
@Override
|
2015-04-02 23:39:46 +02:00
|
|
|
public ChannelFuture resetStream(final ChannelHandlerContext ctx, int streamId, long errorCode,
|
2015-03-14 20:58:30 +01:00
|
|
|
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();
|
|
|
|
}
|
|
|
|
|
2015-11-20 21:12:16 +01:00
|
|
|
final ChannelFuture future;
|
2016-02-09 23:53:38 +01:00
|
|
|
if (stream.state() == IDLE) {
|
|
|
|
// We cannot write RST_STREAM frames on IDLE streams https://tools.ietf.org/html/rfc7540#section-6.4.
|
2015-11-20 21:12:16 +01:00
|
|
|
future = promise.setSuccess();
|
|
|
|
} else {
|
|
|
|
future = frameWriter().writeRstStream(ctx, streamId, errorCode, promise);
|
|
|
|
}
|
2015-01-20 01:48:11 +01:00
|
|
|
|
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();
|
|
|
|
|
2016-02-09 23:53:38 +01:00
|
|
|
if (future.isDone()) {
|
|
|
|
processRstStreamWriteResult(ctx, stream, future);
|
|
|
|
} else {
|
|
|
|
future.addListener(new ChannelFutureListener() {
|
|
|
|
@Override
|
|
|
|
public void operationComplete(ChannelFuture future) throws Exception {
|
|
|
|
processRstStreamWriteResult(ctx, stream, future);
|
2015-03-14 20:58:30 +01:00
|
|
|
}
|
2016-02-09 23:53:38 +01:00
|
|
|
});
|
|
|
|
}
|
2015-01-20 01:48:11 +01:00
|
|
|
|
|
|
|
return future;
|
|
|
|
}
|
|
|
|
|
|
|
|
@Override
|
2015-03-20 02:36:24 +01:00
|
|
|
public ChannelFuture goAway(final ChannelHandlerContext ctx, final int lastStreamId, final long errorCode,
|
|
|
|
final ByteBuf debugData, ChannelPromise promise) {
|
|
|
|
try {
|
|
|
|
final Http2Connection connection = connection();
|
2015-05-03 17:49:49 +02:00
|
|
|
if (connection.goAwaySent() && lastStreamId > connection.remote().lastStreamKnownByPeer()) {
|
2015-03-20 02:36:24 +01:00
|
|
|
throw connectionError(PROTOCOL_ERROR, "Last stream identifier must not increase between " +
|
|
|
|
"sending multiple GOAWAY frames (was '%d', is '%d').",
|
2015-05-03 17:49:49 +02:00
|
|
|
connection.remote().lastStreamKnownByPeer(),
|
2015-03-20 02:36:24 +01:00
|
|
|
lastStreamId);
|
|
|
|
}
|
|
|
|
connection.goAwaySent(lastStreamId, errorCode, debugData);
|
|
|
|
|
2015-05-11 21:10:23 +02:00
|
|
|
// Need to retain before we write the buffer because if we do it after the refCnt could already be 0 and
|
|
|
|
// result in an IllegalRefCountException.
|
|
|
|
debugData.retain();
|
2015-03-20 02:36:24 +01:00
|
|
|
ChannelFuture future = frameWriter().writeGoAway(ctx, lastStreamId, errorCode, debugData, promise);
|
|
|
|
|
2015-05-11 21:10:23 +02:00
|
|
|
if (future.isDone()) {
|
|
|
|
processGoAwayWriteResult(ctx, lastStreamId, errorCode, debugData, future);
|
|
|
|
} else {
|
|
|
|
future.addListener(new ChannelFutureListener() {
|
|
|
|
@Override
|
|
|
|
public void operationComplete(ChannelFuture future) throws Exception {
|
|
|
|
processGoAwayWriteResult(ctx, lastStreamId, errorCode, debugData, future);
|
2015-03-20 02:36:24 +01:00
|
|
|
}
|
2015-05-11 21:10:23 +02:00
|
|
|
});
|
|
|
|
}
|
2015-03-20 02:36:24 +01:00
|
|
|
|
|
|
|
return future;
|
2015-05-11 21:10:23 +02:00
|
|
|
} catch (Throwable cause) { // Make sure to catch Throwable because we are doing a retain() in this method.
|
2015-01-20 01:48:11 +01:00
|
|
|
debugData.release();
|
2015-05-11 21:10:23 +02:00
|
|
|
return promise.setFailure(cause);
|
2015-01-20 01:48:11 +01:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2015-05-30 01:27:59 +02:00
|
|
|
/**
|
|
|
|
* Closes the connection if the graceful shutdown process has completed.
|
|
|
|
* @param future Represents the status that will be passed to the {@link #closeListener}.
|
|
|
|
*/
|
|
|
|
private void checkCloseConnection(ChannelFuture future) {
|
|
|
|
// If this connection is closing and the graceful shutdown has completed, close the connection
|
|
|
|
// once this operation completes.
|
|
|
|
if (closeListener != null && isGracefulShutdownComplete()) {
|
2016-02-09 23:53:38 +01:00
|
|
|
ChannelFutureListener closeListener = this.closeListener;
|
2015-05-30 01:27:59 +02:00
|
|
|
// This method could be called multiple times
|
|
|
|
// and we don't want to notify the closeListener multiple times.
|
2016-02-09 23:53:38 +01:00
|
|
|
this.closeListener = null;
|
2015-05-30 01:27:59 +02:00
|
|
|
try {
|
|
|
|
closeListener.operationComplete(future);
|
|
|
|
} catch (Exception e) {
|
|
|
|
throw new IllegalStateException("Close listener threw an unexpected exception", e);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2015-01-20 01:48:11 +01:00
|
|
|
/**
|
2015-04-23 23:23:23 +02:00
|
|
|
* Close the remote endpoint with with a {@code GO_AWAY} frame. Does <strong>not</strong> flush
|
|
|
|
* immediately, this is the responsibility of the caller.
|
2015-01-20 01:48:11 +01:00
|
|
|
*/
|
2015-04-02 23:39:46 +02:00
|
|
|
private ChannelFuture goAway(ChannelHandlerContext ctx, Http2Exception cause) {
|
2015-01-20 01:48:11 +01:00
|
|
|
long errorCode = cause != null ? cause.error().code() : NO_ERROR.code();
|
2015-03-20 02:36:24 +01:00
|
|
|
int lastKnownStream = connection().remote().lastStreamCreated();
|
2016-03-05 02:08:40 +01:00
|
|
|
return goAway(ctx, lastKnownStream, errorCode, Http2CodecUtil.toByteBuf(ctx, cause), ctx.newPromise());
|
2015-01-20 01:48:11 +01:00
|
|
|
}
|
|
|
|
|
2016-02-09 23:53:38 +01:00
|
|
|
private void processRstStreamWriteResult(ChannelHandlerContext ctx, Http2Stream stream, ChannelFuture future) {
|
|
|
|
if (future.isSuccess()) {
|
|
|
|
closeStream(stream, future);
|
|
|
|
} 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
|
|
|
/**
|
|
|
|
* 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;
|
|
|
|
}
|
|
|
|
|
2015-05-11 21:10:23 +02:00
|
|
|
private static void processGoAwayWriteResult(final ChannelHandlerContext ctx, final int lastStreamId,
|
|
|
|
final long errorCode, final ByteBuf debugData, ChannelFuture future) {
|
|
|
|
try {
|
|
|
|
if (future.isSuccess()) {
|
|
|
|
if (errorCode != NO_ERROR.code()) {
|
|
|
|
if (logger.isDebugEnabled()) {
|
2016-01-29 03:59:51 +01:00
|
|
|
logger.debug("{} Sent GOAWAY: lastStreamId '{}', errorCode '{}', " +
|
|
|
|
"debugData '{}'. Forcing shutdown of the connection.",
|
|
|
|
ctx.channel(), lastStreamId, errorCode, debugData.toString(UTF_8), future.cause());
|
2015-05-11 21:10:23 +02:00
|
|
|
}
|
|
|
|
ctx.close();
|
|
|
|
}
|
|
|
|
} else {
|
2016-03-05 02:04:18 +01:00
|
|
|
if (logger.isDebugEnabled()) {
|
|
|
|
logger.debug("{} Sending GOAWAY failed: lastStreamId '{}', errorCode '{}', " +
|
2016-01-29 03:59:51 +01:00
|
|
|
"debugData '{}'. Forcing shutdown of the connection.",
|
|
|
|
ctx.channel(), lastStreamId, errorCode, debugData.toString(UTF_8), future.cause());
|
2015-05-11 21:10:23 +02:00
|
|
|
}
|
|
|
|
ctx.close();
|
|
|
|
}
|
|
|
|
} finally {
|
|
|
|
// We're done with the debug data now.
|
|
|
|
debugData.release();
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2015-01-20 01:48:11 +01:00
|
|
|
/**
|
|
|
|
* Closes the channel when the future completes.
|
|
|
|
*/
|
|
|
|
private static final class ClosingChannelFutureListener implements ChannelFutureListener {
|
|
|
|
private final ChannelHandlerContext ctx;
|
|
|
|
private final ChannelPromise promise;
|
2015-08-18 19:36:16 +02:00
|
|
|
private final ScheduledFuture<?> timeoutTask;
|
2015-01-20 01:48:11 +01:00
|
|
|
|
|
|
|
ClosingChannelFutureListener(ChannelHandlerContext ctx, ChannelPromise promise) {
|
|
|
|
this.ctx = ctx;
|
|
|
|
this.promise = promise;
|
2015-08-18 19:36:16 +02:00
|
|
|
timeoutTask = null;
|
|
|
|
}
|
|
|
|
|
|
|
|
ClosingChannelFutureListener(final ChannelHandlerContext ctx, final ChannelPromise promise,
|
|
|
|
long timeout, TimeUnit unit) {
|
|
|
|
this.ctx = ctx;
|
|
|
|
this.promise = promise;
|
2016-03-27 14:25:39 +02:00
|
|
|
timeoutTask = ctx.executor().schedule(new Runnable() {
|
2015-08-18 19:36:16 +02:00
|
|
|
@Override
|
|
|
|
public void run() {
|
|
|
|
ctx.close(promise);
|
|
|
|
}
|
|
|
|
}, timeout, unit);
|
2015-01-20 01:48:11 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
@Override
|
|
|
|
public void operationComplete(ChannelFuture sentGoAwayFuture) throws Exception {
|
2015-08-18 19:36:16 +02:00
|
|
|
if (timeoutTask != null) {
|
|
|
|
timeoutTask.cancel(false);
|
|
|
|
}
|
2015-01-20 01:48:11 +01:00
|
|
|
ctx.close(promise);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|