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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.cassandra.hints;
import java.io.IOException;
import java.nio.ByteBuffer;
import javax.crypto.Cipher;
import com.google.common.annotations.VisibleForTesting;
import io.netty.util.concurrent.FastThreadLocal;
import org.apache.cassandra.security.EncryptionUtils;
import org.apache.cassandra.hints.CompressedChecksummedDataInput.Position;
import org.apache.cassandra.io.FSReadError;
import org.apache.cassandra.io.compress.ICompressor;
import org.apache.cassandra.io.util.ChannelProxy;
public class EncryptedChecksummedDataInput extends ChecksummedDataInput
{
private static final FastThreadLocal<ByteBuffer> reusableBuffers = new FastThreadLocal<ByteBuffer>()
{
protected ByteBuffer initialValue()
{
return ByteBuffer.allocate(0);
}
};
private final Cipher cipher;
private final ICompressor compressor;
private final EncryptionUtils.ChannelProxyReadChannel readChannel;
private long sourcePosition;
protected EncryptedChecksummedDataInput(ChannelProxy channel, Cipher cipher, ICompressor compressor, long filePosition)
{
super(channel);
this.cipher = cipher;
this.compressor = compressor;
readChannel = new EncryptionUtils.ChannelProxyReadChannel(channel, filePosition);
this.sourcePosition = filePosition;
assert cipher != null;
assert compressor != null;
}
/**
* Since an entire block of compressed data is read off of disk, not just a hint at a time,
* we don't report EOF until the decompressed data has also been read completely
*/
public boolean isEOF()
{
return readChannel.getCurrentPosition() == channel.size() && buffer.remaining() == 0;
}
public long getSourcePosition()
{
return sourcePosition;
}
static class Position extends ChecksummedDataInput.Position
{
final long bufferStart;
final int bufferPosition;
public Position(long sourcePosition, long bufferStart, int bufferPosition)
{
super(sourcePosition);
this.bufferStart = bufferStart;
this.bufferPosition = bufferPosition;
}
@Override
public long subtract(InputPosition o)
{
Position other = (Position) o;
return bufferStart - other.bufferStart + bufferPosition - other.bufferPosition;
}
}
public InputPosition getSeekPosition()
{
return new Position(sourcePosition, bufferOffset, buffer.position());
}
public void seek(InputPosition p)
{
Position pos = (Position) p;
bufferOffset = pos.bufferStart;
readChannel.setPosition(pos.sourcePosition);
buffer.position(0).limit(0);
resetCrc();
reBuffer();
buffer.position(pos.bufferPosition);
assert sourcePosition == pos.sourcePosition;
assert bufferOffset == pos.bufferStart;
assert buffer.position() == pos.bufferPosition;
}
@Override
protected void readBuffer()
{
this.sourcePosition = readChannel.getCurrentPosition();
if (isEOF())
return;
try
{
ByteBuffer byteBuffer = reusableBuffers.get();
ByteBuffer decrypted = EncryptionUtils.decrypt(readChannel, byteBuffer, true, cipher);
buffer = EncryptionUtils.uncompress(decrypted, buffer, true, compressor);
if (decrypted.capacity() > byteBuffer.capacity())
reusableBuffers.set(decrypted);
}
catch (IOException ioe)
{
throw new FSReadError(ioe, getPath());
}
}
@SuppressWarnings("resource")
public static ChecksummedDataInput upgradeInput(ChecksummedDataInput input, Cipher cipher, ICompressor compressor)
{
long position = input.getPosition();
input.close();
return new EncryptedChecksummedDataInput(new ChannelProxy(input.getPath()), cipher, compressor, position);
}
@VisibleForTesting
Cipher getCipher()
{
return cipher;
}
@VisibleForTesting
ICompressor getCompressor()
{
return compressor;
}
}