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/*
* JBoss, Home of Professional Open Source.
* Copyright 2014 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package io.undertow.protocols.http2;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import org.xnio.Bits;
import org.xnio.ChannelListener;
import org.xnio.ChannelListeners;
import io.undertow.UndertowLogger;
import io.undertow.connector.PooledByteBuffer;
import org.xnio.IoUtils;
import org.xnio.channels.StreamSinkChannel;
import io.undertow.server.protocol.framed.FrameHeaderData;
import io.undertow.util.HeaderMap;
import io.undertow.util.Headers;
/**
* @author Stuart Douglas
*/
public class Http2StreamSourceChannel extends AbstractHttp2StreamSourceChannel implements Http2Stream{
/**
* Flag that is set if the headers frame has the end stream flag set, but not end headers
* which means the last continuation frame is the end of the stream.
*/
private boolean headersEndStream = false;
private boolean rst = false;
private final HeaderMap headers;
private final int streamId;
private Http2HeadersStreamSinkChannel response;
private int flowControlWindow;
private ChannelListener completionListener;
private int remainingPadding;
/**
* This is a bit of a hack, basically it allows the container to delay sending a RST_STREAM on a channel that is knows is broken,
* because it wants to delay the RST until after the response has been set
*
* Used for handling the super nasty 100-continue logic
*/
private boolean ignoreForceClose = false;
private long contentLengthRemaining;
private TrailersHandler trailersHandler;
Http2StreamSourceChannel(Http2Channel framedChannel, PooledByteBuffer data, long frameDataRemaining, HeaderMap headers, int streamId) {
super(framedChannel, data, frameDataRemaining);
this.headers = headers;
this.streamId = streamId;
this.flowControlWindow = framedChannel.getInitialReceiveWindowSize();
String contentLengthString = headers.getFirst(Headers.CONTENT_LENGTH);
if(contentLengthString != null) {
contentLengthRemaining = Long.parseLong(contentLengthString);
} else {
contentLengthRemaining = -1;
}
}
@Override
protected void handleHeaderData(FrameHeaderData headerData) {
Http2FrameHeaderParser data = (Http2FrameHeaderParser) headerData;
Http2PushBackParser parser = data.getParser();
if(parser instanceof Http2DataFrameParser) {
remainingPadding = ((Http2DataFrameParser) parser).getPadding();
if(remainingPadding > 0) {
try {
updateFlowControlWindow(remainingPadding + 1);
} catch (IOException e) {
IoUtils.safeClose(getFramedChannel());
throw new RuntimeException(e);
}
}
} else if(parser instanceof Http2HeadersParser) {
if(trailersHandler != null) {
trailersHandler.handleTrailers(((Http2HeadersParser) parser).getHeaderMap());
}
}
handleFinalFrame(data);
}
@Override
protected long updateFrameDataRemaining(PooledByteBuffer data, long frameDataRemaining) {
long actualDataRemaining = frameDataRemaining - remainingPadding;
if(data.getBuffer().remaining() > actualDataRemaining) {
long paddingThisBuffer = data.getBuffer().remaining() - actualDataRemaining;
data.getBuffer().limit((int) (data.getBuffer().position() + actualDataRemaining));
remainingPadding -= paddingThisBuffer;
return frameDataRemaining - paddingThisBuffer;
}
return frameDataRemaining;
}
void handleFinalFrame(Http2FrameHeaderParser headerData) {
Http2FrameHeaderParser data = headerData;
if (data.type == Http2Channel.FRAME_TYPE_DATA) {
if (Bits.anyAreSet(data.flags, Http2Channel.DATA_FLAG_END_STREAM)) {
this.lastFrame();
}
} else if (data.type == Http2Channel.FRAME_TYPE_HEADERS) {
if (Bits.allAreSet(data.flags, Http2Channel.HEADERS_FLAG_END_STREAM)) {
if (Bits.allAreSet(data.flags, Http2Channel.HEADERS_FLAG_END_HEADERS)) {
this.lastFrame();
} else {
//continuation frames are coming, then we end the stream
headersEndStream = true;
}
}
} else if (headersEndStream && data.type == Http2Channel.FRAME_TYPE_CONTINUATION) {
if (Bits.anyAreSet(data.flags, Http2Channel.CONTINUATION_FLAG_END_HEADERS)) {
this.lastFrame();
}
}
}
public Http2HeadersStreamSinkChannel getResponseChannel() {
if (response != null) {
return response;
}
response = new Http2HeadersStreamSinkChannel(getHttp2Channel(), streamId);
getHttp2Channel().registerStreamSink(response);
return response;
}
@Override
public int read(ByteBuffer dst) throws IOException {
int read = super.read(dst);
updateFlowControlWindow(read);
return read;
}
@Override
public long read(ByteBuffer[] dsts, int offset, int length) throws IOException {
long read = super.read(dsts, offset, length);
updateFlowControlWindow((int) read);
return read;
}
@Override
public long read(ByteBuffer[] dsts) throws IOException {
long read = super.read(dsts);
updateFlowControlWindow((int) read);
return read;
}
@Override
public long transferTo(long count, ByteBuffer throughBuffer, StreamSinkChannel streamSinkChannel) throws IOException {
long read = super.transferTo(count, throughBuffer, streamSinkChannel);
updateFlowControlWindow((int) read + throughBuffer.remaining());
return read;
}
@Override
public long transferTo(long position, long count, FileChannel target) throws IOException {
long read = super.transferTo(position, count, target);
updateFlowControlWindow((int) read);
return read;
}
private void updateFlowControlWindow(final int read) throws IOException {
if (read <= 0) {
return;
}
flowControlWindow -= read;
//TODO: RST stream if flow control limits are exceeded?
//TODO: make this configurable, we should be able to set the policy that is used to determine when to update the window size
Http2Channel http2Channel = getHttp2Channel();
http2Channel.updateReceiveFlowControlWindow(read);
int initialWindowSize = http2Channel.getInitialReceiveWindowSize();
//TODO: this is not great, as we may have already received all the data so there is no need, need to have a way to figure out if all data is buffered
if (flowControlWindow < (initialWindowSize / 2)) {
int delta = initialWindowSize - flowControlWindow;
flowControlWindow += delta;
http2Channel.sendUpdateWindowSize(streamId, delta);
}
}
@Override
protected void complete() throws IOException {
super.complete();
if (completionListener != null) {
ChannelListeners.invokeChannelListener(this, completionListener);
}
}
public HeaderMap getHeaders() {
return headers;
}
public ChannelListener getCompletionListener() {
return completionListener;
}
public void setCompletionListener(ChannelListener completionListener) {
this.completionListener = completionListener;
if(isComplete()) {
ChannelListeners.invokeChannelListener(this, completionListener);
}
}
@Override
void rstStream(int error) {
if (rst) {
return;
}
rst = true;
markStreamBroken();
}
@Override
protected void channelForciblyClosed() {
if (completionListener != null) {
completionListener.handleEvent(this);
}
if(!ignoreForceClose) {
getHttp2Channel().sendRstStream(streamId, Http2Channel.ERROR_CANCEL);
}
markStreamBroken();
}
public void setIgnoreForceClose(boolean ignoreForceClose) {
this.ignoreForceClose = ignoreForceClose;
}
public boolean isIgnoreForceClose() {
return ignoreForceClose;
}
public int getStreamId() {
return streamId;
}
boolean isHeadersEndStream() {
return headersEndStream;
}
public TrailersHandler getTrailersHandler() {
return trailersHandler;
}
public void setTrailersHandler(TrailersHandler trailersHandler) {
this.trailersHandler = trailersHandler;
}
@Override
public String toString() {
return "Http2StreamSourceChannel{" +
"headers=" + headers +
'}';
}
/**
* Checks that the actual content size matches the expected. We check this proactivly, rather than as the data is read
* @param frameLength The amount of data in the frame
* @param last If this is the last frame
*/
void updateContentSize(long frameLength, boolean last) {
if(contentLengthRemaining != -1) {
contentLengthRemaining -= frameLength;
if(contentLengthRemaining < 0) {
UndertowLogger.REQUEST_IO_LOGGER.debugf("Closing stream %s on %s as data length exceeds content size", streamId, getFramedChannel());
getFramedChannel().sendRstStream(streamId, Http2Channel.ERROR_PROTOCOL_ERROR);
} else if(last && contentLengthRemaining != 0) {
UndertowLogger.REQUEST_IO_LOGGER.debugf("Closing stream %s on %s as data length was less than content size", streamId, getFramedChannel());
getFramedChannel().sendRstStream(streamId, Http2Channel.ERROR_PROTOCOL_ERROR);
}
}
}
public interface TrailersHandler {
void handleTrailers(HeaderMap headerMap);
}
}
