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/*
* Copyright (c) 2020, 2021, Oracle and/or its affiliates.
*
* This program is free software; you can redistribute it and/or modify it under
* the terms of the GNU General Public License, version 2.0, as published by the
* Free Software Foundation.
*
* This program is also distributed with certain software (including but not
* limited to OpenSSL) that is licensed under separate terms, as designated in a
* particular file or component or in included license documentation. The
* authors of MySQL hereby grant you an additional permission to link the
* program and your derivative works with the separately licensed software that
* they have included with MySQL.
*
* Without limiting anything contained in the foregoing, this file, which is
* part of MySQL Connector/J, is also subject to the Universal FOSS Exception,
* version 1.0, a copy of which can be found at
* http://oss.oracle.com/licenses/universal-foss-exception.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License, version 2.0,
* for more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
package com.mysql.cj.protocol.x;
import static com.mysql.cj.protocol.x.XMessageHeader.HEADER_LENGTH;
import java.io.ByteArrayInputStream;
import java.io.EOFException;
import java.io.FilterInputStream;
import java.io.IOException;
import java.io.InputStream;
import com.google.protobuf.InvalidProtocolBufferException;
import com.google.protobuf.Parser;
import com.mysql.cj.Messages;
import com.mysql.cj.exceptions.CJCommunicationsException;
import com.mysql.cj.exceptions.ExceptionFactory;
import com.mysql.cj.exceptions.WrongArgumentException;
import com.mysql.cj.x.protobuf.Mysqlx.ServerMessages;
import com.mysql.cj.x.protobuf.MysqlxConnection.Compression;
/**
* An {@link InputStream} wrapper that analyzes X Protocol frames and, if compressed, routes them to a secondary compressor-able {@link InputStream} that also
* knows how to rebuild uncompressed X Protocol frames from compressed ones.
*/
public class CompressionSplittedInputStream extends FilterInputStream {
private CompressorStreamsFactory compressorIoStreamsFactory;
private byte[] frameHeader = new byte[HEADER_LENGTH];
private int frameHeaderConsumed = 0;
private int framePayloadLength = 0;
private int framePayloadConsumed = 0;
private XMessageHeader xMessageHeader;
private InputStream compressorIn = null;
private byte[] singleByte = new byte[1];
private boolean closed = false;
public CompressionSplittedInputStream(InputStream in, CompressorStreamsFactory streamsFactory) {
super(in);
this.compressorIoStreamsFactory = streamsFactory;
}
/**
* Same as {@link InputStream#available()}, except that the exact number of bytes that can be read from the underlying {@link InputStream} may not be
* accurate until it is known if the next bytes contain compressed data or not.
*
* @return an approximate number of available bytes to read.
*
* @see FilterInputStream#available()
*/
@Override
public int available() throws IOException {
ensureOpen();
if (this.compressorIn != null) {
return this.compressorIn.available();
}
return (this.frameHeaderConsumed > 0 ? HEADER_LENGTH - this.frameHeaderConsumed : 0) + this.in.available();
}
/**
* Closes this stream.
*
* @see FilterInputStream#close()
*/
@Override
public void close() throws IOException {
if (!this.closed) {
super.close();
this.in = null;
if (this.compressorIn != null) {
this.compressorIn.close();
}
this.compressorIn = null;
this.closed = true;
}
}
/**
* Forwards the read to {@link #read(byte[], int, int)}.
*
* @see FilterInputStream#read()
*/
@Override
public int read() throws IOException {
ensureOpen();
int read = read(this.singleByte, 0, 1);
if (read >= 0) {
return this.singleByte[0] & 0xff;
}
return read;
}
/**
* Forwards the read to {@link #read(byte[], int, int)}.
*
* @see FilterInputStream#read(byte[])
*/
@Override
public int read(byte[] b) throws IOException {
ensureOpen();
return read(b, 0, b.length);
}
/**
* Reads bytes from the underlying {@link InputStream} either from the one that gets data directly from the original source {@link InputStream} or from
* a compressor able {@link InputStream}, if reading of a compressed X Protocol frame is in progress.
*
* @see FilterInputStream#read(byte[], int, int)
*/
@Override
public int read(byte[] b, int off, int len) throws IOException {
ensureOpen();
if (len <= 0) {
return 0;
}
peekNextFrame();
try {
if (isCompressedDataAvailable()) {
int bytesRead = readFully(this.compressorIn, b, off, len);
if (isCompressedDataReadComplete()) {
this.compressorIn.close();
this.compressorIn = null;
}
return bytesRead;
}
} catch (IOException e) {
throw e;
}
int headerBytesRead = 0;
if (!isFrameHeaderFullyConsumed()) { // Recycle the frame header bytes.
int lenToConsume = Math.min(len, HEADER_LENGTH - this.frameHeaderConsumed);
System.arraycopy(this.frameHeader, this.frameHeaderConsumed, b, off, lenToConsume);
off += lenToConsume;
len -= lenToConsume;
this.frameHeaderConsumed += lenToConsume;
headerBytesRead = lenToConsume;
}
// Read frame payload bytes.
int payloadBytesRead = readFully(b, off, len);
this.framePayloadConsumed += payloadBytesRead;
return headerBytesRead + payloadBytesRead;
}
/**
* Checks the header of the next X Protocol frame and, depending on its type, sets up this class to read from an alternative compressor able underlying
* {@link InputStream}.
*
* @throws IOException
* if any of the underlying I/O operations fail.
*/
private void peekNextFrame() throws IOException {
if (isDataAvailable()) {
return;
}
readFully(this.frameHeader, 0, HEADER_LENGTH);
this.xMessageHeader = new XMessageHeader(this.frameHeader);
this.framePayloadLength = this.xMessageHeader.getMessageSize();
this.frameHeaderConsumed = 0;
this.framePayloadConsumed = 0;
if (isCompressedFrame()) {
Compression compressedMessage = parseCompressedMessage();
this.compressorIn = new ConfinedInputStream(
this.compressorIoStreamsFactory.getInputStreamInstance(new ByteArrayInputStream(compressedMessage.getPayload().toByteArray())),
(int) compressedMessage.getUncompressedSize());
// Preemptively set as all bytes consumed since next reads will be redirected to the compressor InputStream.
this.frameHeaderConsumed = HEADER_LENGTH;
this.framePayloadConsumed = this.framePayloadLength;
}
}
/**
* Checks if current X Protocol frame is compressed.
*
* @return
* true if the type of current frame is {@link com.mysql.cj.x.protobuf.Mysqlx.ServerMessages.Type#COMPRESSION}, false
* otherwise.
*/
private boolean isCompressedFrame() {
return ServerMessages.Type.forNumber(this.xMessageHeader.getMessageType()) == ServerMessages.Type.COMPRESSION;
}
/**
* Parses the next X Protocol message as a compressed one.
*
* @return
* The Protobuf {@link Compression} message.
*/
@SuppressWarnings("unchecked")
private Compression parseCompressedMessage() {
Parser parser = (Parser) MessageConstants.MESSAGE_CLASS_TO_PARSER
.get(MessageConstants.MESSAGE_TYPE_TO_CLASS.get(ServerMessages.Type.COMPRESSION_VALUE));
byte[] packet = new byte[this.xMessageHeader.getMessageSize()];
try {
readFully(packet);
} catch (IOException e) {
throw ExceptionFactory.createException(CJCommunicationsException.class, Messages.getString("Protocol.Compression.Streams.0"), e);
}
try {
return parser.parseFrom(packet);
} catch (InvalidProtocolBufferException e) {
throw ExceptionFactory.createException(WrongArgumentException.class, Messages.getString("Protocol.Compression.Streams.1"), e);
}
}
/**
* Checks if there is data available to be consumed.
*
* @return
* true if this frame's bytes weren't all consumed yet, false otherwise.
*
* @throws IOException
* if any of the underlying I/O operations fail.
*/
private boolean isDataAvailable() throws IOException {
return isCompressedDataAvailable() || this.frameHeaderConsumed > 0 && this.frameHeaderConsumed < HEADER_LENGTH
|| isFrameHeaderFullyConsumed() && this.framePayloadConsumed < this.framePayloadLength;
}
/**
* Checks if there is data available in the compressed {@link InputStream} to be consumed.
*
* @return
* true if there is compressed data available, false otherwise.
*
* @throws IOException
* if any of the underlying I/O operations fail.
*/
private boolean isCompressedDataAvailable() throws IOException {
return this.compressorIn != null && this.compressorIn.available() > 0;
}
/**
* Checks if all data from the compressed {@link InputStream} was fully consumed.
*
* @return
* true if all compressed data was consumed, false otherwise.
*
* @throws IOException
* if any of the underlying I/O operations fail.
*/
private boolean isCompressedDataReadComplete() throws IOException {
return this.compressorIn != null && this.compressorIn.available() == 0;
}
/**
* Checks if the X Protocol frame header was fully consumed.
*
* @return
* true if the frame header was fully consumed, false otherwise.
*/
boolean isFrameHeaderFullyConsumed() {
return this.frameHeaderConsumed == HEADER_LENGTH;
}
/**
* Reads the number of bytes required to fill the given buffer from the underlying {@link InputStream}, blocking if needed.
*
* @param b
* the buffer into which the data is read.
* @return the total number of bytes read into the buffer, or -1 if there is no more data because the end of the stream has been reached.
* @exception IOException
* if any of the underlying I/O operations fail.
*/
public int readFully(byte[] b) throws IOException {
return readFully(b, 0, b.length);
}
/**
* Reads the exact number of requested bytes from the underlying {@link InputStream}, blocking if needed.
*
* @param b
* the buffer into which the data is read.
* @param off
* the start offset in the destination array b
* @param len
* the maximum number of bytes read.
* @return the total number of bytes read into the buffer, or -1 if there is no more data because the end of the stream has been reached.
* @exception IOException
* if any of the underlying I/O operations fail.
*/
private final int readFully(byte[] b, int off, int len) throws IOException {
return readFully(this.in, b, off, len);
}
/**
* Reads the exact number of requested bytes from the given {@link InputStream}, blocking if needed.
*
* @param inStream
* input stream to read from
* @param b
* the buffer into which the data is read.
* @param off
* the start offset in the destination array b
* @param len
* the maximum number of bytes read.
* @return the total number of bytes read into the buffer, or -1 if there is no more data because the end of the stream has been reached.
*
* @throws IOException
* if any of the underlying I/O operations fail.
*/
private final int readFully(InputStream inStream, byte[] b, int off, int len) throws IOException {
if (len < 0) {
throw new IndexOutOfBoundsException();
}
int total = 0;
while (total < len) {
int count = inStream.read(b, off + total, len - total);
if (count < 0) {
throw new EOFException();
}
total += count;
}
return total;
}
/**
* Ensures that this {@link InputStream} wasn't closed yet.
*
* @throws IOException
* if this {@link InputStream} was closed.
*/
private void ensureOpen() throws IOException {
if (this.closed) {
throw new IOException("Stream closed");
}
}
}
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