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.DEFAULT_PRIORITY_WEIGHT;
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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.util.internal.ObjectUtil.checkNotNull;
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import io.netty.buffer.ByteBuf;
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2015-01-23 20:32:17 +01:00
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import io.netty.buffer.Unpooled;
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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.ChannelPromise;
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2015-03-26 00:29:14 +01:00
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import io.netty.handler.codec.http2.Http2Exception.ClosedStreamCreationException;
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2015-01-23 20:32:17 +01:00
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import io.netty.util.ReferenceCountUtil;
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2015-01-20 01:48:11 +01:00
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import java.util.ArrayDeque;
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/**
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* Default implementation of {@link Http2ConnectionEncoder}.
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*/
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public class DefaultHttp2ConnectionEncoder implements Http2ConnectionEncoder {
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private final Http2FrameWriter frameWriter;
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private final Http2Connection connection;
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2015-03-27 23:37:20 +01:00
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private Http2LifecycleManager lifecycleManager;
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2015-01-20 01:48:11 +01:00
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// We prefer ArrayDeque to LinkedList because later will produce more GC.
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// This initial capacity is plenty for SETTINGS traffic.
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private final ArrayDeque<Http2Settings> outstandingLocalSettingsQueue = new ArrayDeque<Http2Settings>(4);
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2015-03-27 23:37:20 +01:00
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public DefaultHttp2ConnectionEncoder(Http2Connection connection, Http2FrameWriter frameWriter) {
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this.connection = checkNotNull(connection, "connection");
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this.frameWriter = checkNotNull(frameWriter, "frameWriter");
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2015-01-20 01:48:11 +01:00
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if (connection.remote().flowController() == null) {
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2015-01-23 20:32:17 +01:00
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connection.remote().flowController(new DefaultHttp2RemoteFlowController(connection));
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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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@Override
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public void lifecycleManager(Http2LifecycleManager lifecycleManager) {
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this.lifecycleManager = checkNotNull(lifecycleManager, "lifecycleManager");
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}
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2015-01-20 01:48:11 +01:00
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@Override
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public Http2FrameWriter frameWriter() {
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return frameWriter;
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}
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@Override
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public Http2Connection connection() {
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return connection;
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}
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@Override
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public final Http2RemoteFlowController flowController() {
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return connection().remote().flowController();
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}
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@Override
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public void remoteSettings(Http2Settings settings) throws Http2Exception {
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Boolean pushEnabled = settings.pushEnabled();
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Http2FrameWriter.Configuration config = configuration();
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Http2HeaderTable outboundHeaderTable = config.headerTable();
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Http2FrameSizePolicy outboundFrameSizePolicy = config.frameSizePolicy();
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if (pushEnabled != null) {
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if (!connection.isServer()) {
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throw connectionError(PROTOCOL_ERROR, "Client received SETTINGS frame with ENABLE_PUSH specified");
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}
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connection.remote().allowPushTo(pushEnabled);
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}
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Long maxConcurrentStreams = settings.maxConcurrentStreams();
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if (maxConcurrentStreams != null) {
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2015-03-15 02:38:35 +01:00
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connection.local().maxActiveStreams((int) Math.min(maxConcurrentStreams, Integer.MAX_VALUE));
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2015-01-20 01:48:11 +01:00
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}
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Long headerTableSize = settings.headerTableSize();
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if (headerTableSize != null) {
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outboundHeaderTable.maxHeaderTableSize((int) Math.min(headerTableSize, Integer.MAX_VALUE));
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}
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Integer maxHeaderListSize = settings.maxHeaderListSize();
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if (maxHeaderListSize != null) {
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outboundHeaderTable.maxHeaderListSize(maxHeaderListSize);
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}
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Integer maxFrameSize = settings.maxFrameSize();
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if (maxFrameSize != null) {
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outboundFrameSizePolicy.maxFrameSize(maxFrameSize);
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}
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Integer initialWindowSize = settings.initialWindowSize();
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if (initialWindowSize != null) {
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flowController().initialWindowSize(initialWindowSize);
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}
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}
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@Override
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public ChannelFuture writeData(final ChannelHandlerContext ctx, final int streamId, ByteBuf data, int padding,
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final boolean endOfStream, ChannelPromise promise) {
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2015-01-23 20:32:17 +01:00
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final Http2Stream stream;
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2015-01-20 01:48:11 +01:00
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try {
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2015-04-21 23:18:02 +02:00
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stream = requireStream(streamId);
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2015-01-20 01:48:11 +01:00
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// Verify that the stream is in the appropriate state for sending DATA frames.
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switch (stream.state()) {
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case OPEN:
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case HALF_CLOSED_REMOTE:
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// Allowed sending DATA frames in these states.
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break;
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default:
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throw new IllegalStateException(String.format(
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"Stream %d in unexpected state: %s", stream.id(), stream.state()));
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}
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} catch (Throwable e) {
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data.release();
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return promise.setFailure(e);
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}
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// Hand control of the frame to the flow controller.
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2015-01-23 20:32:17 +01:00
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flowController().sendFlowControlled(ctx, stream,
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new FlowControlledData(ctx, stream, data, padding, endOfStream, promise));
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return promise;
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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 ChannelFuture writeHeaders(ChannelHandlerContext ctx, int streamId, Http2Headers headers, int padding,
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boolean endStream, ChannelPromise promise) {
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return writeHeaders(ctx, streamId, headers, 0, DEFAULT_PRIORITY_WEIGHT, false, padding, endStream, promise);
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}
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@Override
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public ChannelFuture writeHeaders(final ChannelHandlerContext ctx, final int streamId,
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final Http2Headers headers, final int streamDependency, final short weight,
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final boolean exclusive, final int padding, final boolean endOfStream,
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final ChannelPromise promise) {
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try {
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2015-01-23 20:32:17 +01:00
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Http2Stream stream = connection.stream(streamId);
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2015-01-20 01:48:11 +01:00
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if (stream == null) {
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2015-04-22 23:35:31 +02:00
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stream = connection.local().createStream(streamId, endOfStream);
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} else {
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switch (stream.state()) {
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case RESERVED_LOCAL:
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stream.open(endOfStream);
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break;
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case OPEN:
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case HALF_CLOSED_REMOTE:
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// Allowed sending headers in these states.
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break;
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default:
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throw new IllegalStateException(String.format(
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"Stream %d in unexpected state: %s", stream.id(), stream.state()));
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}
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2015-01-20 01:48:11 +01:00
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}
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2015-01-23 20:32:17 +01:00
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// Pass headers to the flow-controller so it can maintain their sequence relative to DATA frames.
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flowController().sendFlowControlled(ctx, stream,
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new FlowControlledHeaders(ctx, stream, headers, streamDependency, weight,
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exclusive, padding, endOfStream, promise));
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return promise;
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2015-01-20 01:48:11 +01:00
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} catch (Http2NoMoreStreamIdsException e) {
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lifecycleManager.onException(ctx, e);
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return promise.setFailure(e);
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} catch (Throwable e) {
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return promise.setFailure(e);
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}
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}
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@Override
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public ChannelFuture writePriority(ChannelHandlerContext ctx, int streamId, int streamDependency, short weight,
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boolean exclusive, ChannelPromise promise) {
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try {
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// Update the priority on this stream.
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Http2Stream stream = connection.stream(streamId);
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if (stream == null) {
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2015-04-22 23:35:31 +02:00
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stream = connection.local().createIdleStream(streamId);
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2015-01-20 01:48:11 +01:00
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}
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2015-03-26 00:29:14 +01:00
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// The set priority operation must be done before sending the frame. The parent may not yet exist
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// and the priority tree may also be modified before sending.
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2015-01-20 01:48:11 +01:00
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stream.setPriority(streamDependency, weight, exclusive);
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2015-03-26 00:29:14 +01:00
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} catch (ClosedStreamCreationException ignored) {
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// It is possible that either the stream for this frame or the parent stream is closed.
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// In this case we should ignore the exception and allow the frame to be sent.
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} catch (Throwable t) {
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return promise.setFailure(t);
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2015-01-20 01:48:11 +01:00
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}
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ChannelFuture future = frameWriter.writePriority(ctx, streamId, streamDependency, weight, exclusive, promise);
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return future;
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}
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@Override
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public ChannelFuture writeRstStream(ChannelHandlerContext ctx, int streamId, long errorCode,
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ChannelPromise promise) {
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// Delegate to the lifecycle manager for proper updating of connection state.
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2015-04-02 23:39:46 +02:00
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return lifecycleManager.resetStream(ctx, streamId, errorCode, promise);
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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 ChannelFuture writeSettings(ChannelHandlerContext ctx, Http2Settings settings,
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ChannelPromise promise) {
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outstandingLocalSettingsQueue.add(settings);
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try {
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Boolean pushEnabled = settings.pushEnabled();
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if (pushEnabled != null && connection.isServer()) {
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throw connectionError(PROTOCOL_ERROR, "Server sending SETTINGS frame with ENABLE_PUSH specified");
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}
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} catch (Throwable e) {
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return promise.setFailure(e);
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}
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ChannelFuture future = frameWriter.writeSettings(ctx, settings, promise);
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return future;
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}
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@Override
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public ChannelFuture writeSettingsAck(ChannelHandlerContext ctx, ChannelPromise promise) {
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ChannelFuture future = frameWriter.writeSettingsAck(ctx, promise);
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return future;
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}
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@Override
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2015-03-20 02:36:24 +01:00
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public ChannelFuture writePing(ChannelHandlerContext ctx, boolean ack, ByteBuf data, ChannelPromise promise) {
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2015-01-20 01:48:11 +01:00
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ChannelFuture future = frameWriter.writePing(ctx, ack, data, promise);
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return future;
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}
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@Override
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public ChannelFuture writePushPromise(ChannelHandlerContext ctx, int streamId, int promisedStreamId,
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Http2Headers headers, int padding, ChannelPromise promise) {
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try {
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2015-03-20 02:36:24 +01:00
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if (connection.goAwayReceived()) {
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throw connectionError(PROTOCOL_ERROR, "Sending PUSH_PROMISE after GO_AWAY received.");
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2015-01-20 01:48:11 +01:00
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}
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2015-04-21 23:18:02 +02:00
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Http2Stream stream = requireStream(streamId);
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2015-03-20 02:36:24 +01:00
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// Reserve the promised stream.
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2015-01-20 01:48:11 +01:00
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connection.local().reservePushStream(promisedStreamId, stream);
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} catch (Throwable e) {
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return promise.setFailure(e);
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}
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ChannelFuture future = frameWriter.writePushPromise(ctx, streamId, promisedStreamId, headers, padding, promise);
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return future;
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}
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@Override
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public ChannelFuture writeGoAway(ChannelHandlerContext ctx, int lastStreamId, long errorCode, ByteBuf debugData,
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ChannelPromise promise) {
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2015-04-02 23:39:46 +02:00
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return lifecycleManager.goAway(ctx, lastStreamId, errorCode, debugData, promise);
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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 ChannelFuture writeWindowUpdate(ChannelHandlerContext ctx, int streamId, int windowSizeIncrement,
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ChannelPromise promise) {
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return promise.setFailure(new UnsupportedOperationException("Use the Http2[Inbound|Outbound]FlowController" +
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" objects to control window sizes"));
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}
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@Override
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public ChannelFuture writeFrame(ChannelHandlerContext ctx, byte frameType, int streamId, Http2Flags flags,
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ByteBuf payload, ChannelPromise promise) {
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return frameWriter.writeFrame(ctx, frameType, streamId, flags, payload, promise);
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}
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@Override
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public void close() {
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frameWriter.close();
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}
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@Override
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public Http2Settings pollSentSettings() {
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return outstandingLocalSettingsQueue.poll();
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}
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@Override
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public Configuration configuration() {
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return frameWriter.configuration();
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}
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2015-01-23 20:32:17 +01:00
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2015-04-21 23:18:02 +02:00
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private Http2Stream requireStream(int streamId) {
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Http2Stream stream = connection.stream(streamId);
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if (stream == null) {
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final String message;
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if (connection.streamMayHaveExisted(streamId)) {
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message = "Stream no longer exists: " + streamId;
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} else {
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message = "Stream does not exist: " + streamId;
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}
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throw new IllegalArgumentException(message);
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}
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return stream;
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}
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2015-01-23 20:32:17 +01:00
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/**
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* Wrap a DATA frame so it can be written subject to flow-control. Note that this implementation assumes it
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* only writes padding once for the entire payload as opposed to writing it once per-frame. This makes the
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* {@link #size} calculation deterministic thereby greatly simplifying the implementation.
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* <p>
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* If frame-splitting is required to fit within max-frame-size and flow-control constraints we ensure that
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* the passed promise is not completed until last frame write.
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* </p>
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*/
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private final class FlowControlledData extends FlowControlledBase {
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private ByteBuf data;
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private int size;
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private FlowControlledData(ChannelHandlerContext ctx, Http2Stream stream, ByteBuf data, int padding,
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boolean endOfStream, ChannelPromise promise) {
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super(ctx, stream, padding, endOfStream, promise);
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this.data = data;
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size = data.readableBytes() + padding;
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}
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@Override
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public int size() {
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return size;
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}
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@Override
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public void error(Throwable cause) {
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ReferenceCountUtil.safeRelease(data);
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lifecycleManager.onException(ctx, cause);
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data = null;
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size = 0;
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promise.tryFailure(cause);
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}
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@Override
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2015-04-23 23:23:23 +02:00
|
|
|
public void write(int allowedBytes) {
|
2015-03-05 00:55:55 +01:00
|
|
|
int bytesWritten = 0;
|
2015-04-23 23:23:23 +02:00
|
|
|
if (data == null || (allowedBytes == 0 && size != 0)) {
|
|
|
|
// No point writing an empty DATA frame, wait for a bigger allowance.
|
|
|
|
return;
|
|
|
|
}
|
2015-01-23 20:32:17 +01:00
|
|
|
try {
|
2015-03-05 00:55:55 +01:00
|
|
|
int maxFrameSize = frameWriter().configuration().frameSizePolicy().maxFrameSize();
|
2015-01-23 20:32:17 +01:00
|
|
|
do {
|
|
|
|
int allowedFrameSize = Math.min(maxFrameSize, allowedBytes - bytesWritten);
|
|
|
|
ByteBuf toWrite;
|
|
|
|
// Let data consume the frame before padding.
|
|
|
|
int writeableData = data.readableBytes();
|
|
|
|
if (writeableData > allowedFrameSize) {
|
|
|
|
writeableData = allowedFrameSize;
|
|
|
|
toWrite = data.readSlice(writeableData).retain();
|
|
|
|
} else {
|
|
|
|
// We're going to write the full buffer which will cause it to be released, for subsequent
|
|
|
|
// writes just use empty buffer to avoid over-releasing. Have to use an empty buffer
|
|
|
|
// as we may continue to write padding in subsequent frames.
|
|
|
|
toWrite = data;
|
|
|
|
data = Unpooled.EMPTY_BUFFER;
|
|
|
|
}
|
|
|
|
int writeablePadding = Math.min(allowedFrameSize - writeableData, padding);
|
|
|
|
padding -= writeablePadding;
|
|
|
|
bytesWritten += writeableData + writeablePadding;
|
|
|
|
ChannelPromise writePromise;
|
|
|
|
if (size == bytesWritten) {
|
|
|
|
// Can use the original promise if it's the last write
|
|
|
|
writePromise = promise;
|
|
|
|
} else {
|
|
|
|
// Create a new promise and listen to it for failure
|
|
|
|
writePromise = ctx.newPromise();
|
|
|
|
writePromise.addListener(this);
|
|
|
|
}
|
|
|
|
frameWriter().writeData(ctx, stream.id(), toWrite, writeablePadding,
|
2015-03-05 00:55:55 +01:00
|
|
|
size == bytesWritten && endOfStream, writePromise);
|
2015-01-23 20:32:17 +01:00
|
|
|
} while (size != bytesWritten && allowedBytes > bytesWritten);
|
2015-03-05 00:55:55 +01:00
|
|
|
} finally {
|
|
|
|
size -= bytesWritten;
|
2015-01-23 20:32:17 +01:00
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Wrap headers so they can be written subject to flow-control. While headers do not have cost against the
|
|
|
|
* flow-control window their order with respect to other frames must be maintained, hence if a DATA frame is
|
|
|
|
* blocked on flow-control a HEADER frame must wait until this frame has been written.
|
|
|
|
*/
|
|
|
|
private final class FlowControlledHeaders extends FlowControlledBase {
|
|
|
|
|
|
|
|
private final Http2Headers headers;
|
|
|
|
private final int streamDependency;
|
|
|
|
private final short weight;
|
|
|
|
private final boolean exclusive;
|
|
|
|
|
|
|
|
private FlowControlledHeaders(ChannelHandlerContext ctx, Http2Stream stream, Http2Headers headers,
|
|
|
|
int streamDependency, short weight, boolean exclusive, int padding,
|
|
|
|
boolean endOfStream, ChannelPromise promise) {
|
|
|
|
super(ctx, stream, padding, endOfStream, promise);
|
|
|
|
this.headers = headers;
|
|
|
|
this.streamDependency = streamDependency;
|
|
|
|
this.weight = weight;
|
|
|
|
this.exclusive = exclusive;
|
|
|
|
}
|
|
|
|
|
|
|
|
@Override
|
|
|
|
public int size() {
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
@Override
|
|
|
|
public void error(Throwable cause) {
|
|
|
|
lifecycleManager.onException(ctx, cause);
|
|
|
|
promise.tryFailure(cause);
|
|
|
|
}
|
|
|
|
|
|
|
|
@Override
|
2015-04-23 23:23:23 +02:00
|
|
|
public void write(int allowedBytes) {
|
2015-01-23 20:32:17 +01:00
|
|
|
frameWriter().writeHeaders(ctx, stream.id(), headers, streamDependency, weight, exclusive,
|
|
|
|
padding, endOfStream, promise);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Common base type for payloads to deliver via flow-control.
|
|
|
|
*/
|
|
|
|
public abstract class FlowControlledBase implements Http2RemoteFlowController.FlowControlled,
|
|
|
|
ChannelFutureListener {
|
|
|
|
protected final ChannelHandlerContext ctx;
|
|
|
|
protected final Http2Stream stream;
|
|
|
|
protected final ChannelPromise promise;
|
|
|
|
protected final boolean endOfStream;
|
|
|
|
protected int padding;
|
|
|
|
|
|
|
|
public FlowControlledBase(final ChannelHandlerContext ctx, final Http2Stream stream, int padding,
|
|
|
|
boolean endOfStream, final ChannelPromise promise) {
|
|
|
|
this.ctx = ctx;
|
|
|
|
if (padding < 0) {
|
|
|
|
throw new IllegalArgumentException("padding must be >= 0");
|
|
|
|
}
|
|
|
|
this.padding = padding;
|
|
|
|
this.endOfStream = endOfStream;
|
|
|
|
this.stream = stream;
|
|
|
|
this.promise = promise;
|
2015-03-05 00:55:55 +01:00
|
|
|
// Ensure error() gets called in case something goes wrong after the frame is passed to Netty.
|
2015-01-23 20:32:17 +01:00
|
|
|
promise.addListener(this);
|
|
|
|
}
|
|
|
|
|
2015-03-05 00:55:55 +01:00
|
|
|
@Override
|
|
|
|
public void writeComplete() {
|
|
|
|
if (endOfStream) {
|
2015-04-02 23:39:46 +02:00
|
|
|
lifecycleManager.closeStreamLocal(stream, promise);
|
2015-03-05 00:55:55 +01:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2015-01-23 20:32:17 +01:00
|
|
|
@Override
|
|
|
|
public void operationComplete(ChannelFuture future) throws Exception {
|
|
|
|
if (!future.isSuccess()) {
|
|
|
|
error(future.cause());
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
2015-01-20 01:48:11 +01:00
|
|
|
}
|