/*
* 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.spdy;
import io.undertow.UndertowMessages;
import io.undertow.server.protocol.framed.SendFrameHeader;
import io.undertow.util.HeaderMap;
import io.undertow.util.HeaderValues;
import org.xnio.Pooled;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.zip.Deflater;
/**
* @author Stuart Douglas
*/
public abstract class SpdyStreamStreamSinkChannel extends SpdyStreamSinkChannel {
private final int streamId;
//flow control related items. Accessed under lock
private int flowControlWindow;
private int initialWindowSize; //we track the initial window size, and then re-query it to get any delta
private SendFrameHeader header;
SpdyStreamStreamSinkChannel(SpdyChannel channel, int streamId) {
super(channel);
this.streamId = streamId;
this.flowControlWindow = channel.getInitialWindowSize();
this.initialWindowSize = this.flowControlWindow;
}
public int getStreamId() {
return streamId;
}
SendFrameHeader generateSendFrameHeader() {
header = createFrameHeaderImpl();
return header;
}
void clearHeader() {
this.header = null;
}
@Override
protected final SendFrameHeader createFrameHeader() {
SendFrameHeader header = this.header;
this.header = null;
return header;
}
protected Pooled<ByteBuffer>[] createHeaderBlock(Pooled<ByteBuffer> firstHeaderBuffer, Pooled<ByteBuffer>[] allHeaderBuffers, ByteBuffer firstBuffer, HeaderMap headers) {
Pooled<ByteBuffer> outPooled = getChannel().getHeapBufferPool().allocate();
Pooled<ByteBuffer> inPooled = getChannel().getHeapBufferPool().allocate();
try {
Pooled<ByteBuffer> currentPooled = firstHeaderBuffer;
ByteBuffer inputBuffer = inPooled.getResource();
ByteBuffer outputBuffer = outPooled.getResource();
SpdyProtocolUtils.putInt(inputBuffer, headers.size());
long fiCookie = headers.fastIterateNonEmpty();
while (fiCookie != -1) {
HeaderValues headerValues = headers.fiCurrent(fiCookie);
int valueSize = headerValues.size() - 1; //null between the characters
for (int i = 0; i < headerValues.size(); ++i) {
String val = headerValues.get(i);
valueSize += val.length();
}
int totalSize = 8 + headerValues.getHeaderName().length() + valueSize; // 8 == two ints for name and value sizes
if (totalSize > inputBuffer.limit()) {
//todo: support large single headers
throw UndertowMessages.MESSAGES.headersTooLargeToFitInHeapBuffer();
} else if (totalSize > inputBuffer.remaining()) {
allHeaderBuffers = doDeflate(inputBuffer, outputBuffer, currentPooled, allHeaderBuffers);
if(allHeaderBuffers != null) {
currentPooled = allHeaderBuffers[allHeaderBuffers.length - 1];
}
inputBuffer.clear();
outputBuffer.clear();
}
//TODO: for now it just fails if there are too many headers
SpdyProtocolUtils.putInt(inputBuffer, headerValues.getHeaderName().length());
for (int i = 0; i < headerValues.getHeaderName().length(); ++i) {
inputBuffer.put((byte) (Character.toLowerCase((char) headerValues.getHeaderName().byteAt(i))));
}
SpdyProtocolUtils.putInt(inputBuffer, valueSize);
for (int i = 0; i < headerValues.size(); ++i) {
String val = headerValues.get(i);
for (int j = 0; j < val.length(); ++j) {
inputBuffer.put((byte) val.charAt(j));
}
if (i != headerValues.size() - 1) {
inputBuffer.put((byte) 0);
}
}
fiCookie = headers.fiNext(fiCookie);
}
allHeaderBuffers = doDeflate(inputBuffer, outputBuffer, currentPooled, allHeaderBuffers);
int totalLength;
if (allHeaderBuffers != null) {
totalLength = -8;
for (Pooled<ByteBuffer> b : allHeaderBuffers) {
totalLength += b.getResource().position();
}
} else {
totalLength = firstBuffer.position() - 8;
}
SpdyProtocolUtils.putInt(firstBuffer, ((isWritesShutdown() && !getBuffer().hasRemaining() ? SpdyChannel.FLAG_FIN : 0) << 24) | totalLength, 4);
} finally {
inPooled.free();
outPooled.free();
}
return allHeaderBuffers;
}
protected abstract SendFrameHeader createFrameHeaderImpl();
/**
* This method should be called before sending. It will return the amount of
* data that can be sent, taking into account the stream and connection flow
* control windows, and the toSend parameter.
* <p/>
* It will decrement the flow control windows by the amount that can be sent,
* so this method should only be called as a frame is being queued.
*
* @return The number of bytes that can be sent
*/
protected synchronized int grabFlowControlBytes(int toSend) {
int newWindowSize = this.getChannel().getInitialWindowSize();
int settingsDelta = newWindowSize - this.initialWindowSize;
//first adjust for any settings frame updates
this.initialWindowSize = newWindowSize;
this.flowControlWindow += settingsDelta;
int min = Math.min(toSend, this.flowControlWindow);
int actualBytes = this.getChannel().grabFlowControlBytes(min);
this.flowControlWindow -= actualBytes;
if (actualBytes == 0) {
suspendWritesInternal();
}
return actualBytes;
}
synchronized void updateFlowControlWindow(final int delta) throws IOException {
boolean exhausted = flowControlWindow == 0;
flowControlWindow += delta;
if (exhausted) {
getChannel().notifyFlowControlAllowed();
if (isWriteResumed()) {
resumeWritesInternal();
}
}
}
private Pooled[] doDeflate(ByteBuffer inputBuffer, ByteBuffer outputBuffer, Pooled<ByteBuffer> currentPooled, Pooled<ByteBuffer>[] allHeaderBuffers) {
Deflater deflater = getDeflater();
deflater.setInput(inputBuffer.array(), inputBuffer.arrayOffset(), inputBuffer.position());
int deflated;
do {
deflated = deflater.deflate(outputBuffer.array(), outputBuffer.arrayOffset(), outputBuffer.remaining(), Deflater.SYNC_FLUSH);
if (deflated <= currentPooled.getResource().remaining()) {
currentPooled.getResource().put(outputBuffer.array(), outputBuffer.arrayOffset(), deflated);
} else {
int pos = outputBuffer.arrayOffset();
int remaining = deflated;
ByteBuffer current = currentPooled.getResource();
do {
int toPut = Math.min(current.remaining(), remaining);
current.put(outputBuffer.array(), pos, toPut);
pos += toPut;
remaining -= toPut;
if (remaining > 0) {
allHeaderBuffers = allocateAll(allHeaderBuffers, currentPooled);
currentPooled = allHeaderBuffers[allHeaderBuffers.length - 1];
current = currentPooled.getResource();
}
} while (remaining > 0);
}
} while (!deflater.needsInput());
return allHeaderBuffers;
}
protected abstract Deflater getDeflater();
protected Pooled<ByteBuffer>[] allocateAll(Pooled<ByteBuffer>[] allHeaderBuffers, Pooled<ByteBuffer> currentBuffer) {
Pooled<ByteBuffer>[] ret;
if (allHeaderBuffers == null) {
ret = new Pooled[2];
ret[0] = currentBuffer;
ret[1] = getChannel().getBufferPool().allocate();
} else {
ret = new Pooled[allHeaderBuffers.length + 1];
System.arraycopy(allHeaderBuffers, 0, ret, 0, allHeaderBuffers.length);
ret[ret.length - 1] = getChannel().getBufferPool().allocate();
}
return ret;
}
}