/*************************************************************************
* Copyright 2009-2014 Eucalyptus Systems, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 3 of the License.
*
* 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 for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see http://www.gnu.org/licenses/.
*
* Please contact Eucalyptus Systems, Inc., 6755 Hollister Ave., Goleta
* CA 93117, USA or visit http://www.eucalyptus.com/licenses/ if you need
* additional information or have any questions.
*
* This file may incorporate work covered under the following copyright
* and permission notice:
*
* Software License Agreement (BSD License)
*
* Copyright (c) 2008, Regents of the University of California
* All rights reserved.
*
* Redistribution and use of this software in source and binary forms,
* with or without modification, are permitted provided that the
* following conditions are met:
*
* Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE. USERS OF THIS SOFTWARE ACKNOWLEDGE
* THE POSSIBLE PRESENCE OF OTHER OPEN SOURCE LICENSED MATERIAL,
* COPYRIGHTED MATERIAL OR PATENTED MATERIAL IN THIS SOFTWARE,
* AND IF ANY SUCH MATERIAL IS DISCOVERED THE PARTY DISCOVERING
* IT MAY INFORM DR. RICH WOLSKI AT THE UNIVERSITY OF CALIFORNIA,
* SANTA BARBARA WHO WILL THEN ASCERTAIN THE MOST APPROPRIATE REMEDY,
* WHICH IN THE REGENTS' DISCRETION MAY INCLUDE, WITHOUT LIMITATION,
* REPLACEMENT OF THE CODE SO IDENTIFIED, LICENSING OF THE CODE SO
* IDENTIFIED, OR WITHDRAWAL OF THE CODE CAPABILITY TO THE EXTENT
* NEEDED TO COMPLY WITH ANY SUCH LICENSES OR RIGHTS.
************************************************************************/
package com.eucalyptus.blockstorage.ceph;
import java.io.IOException;
import java.io.InputStream;
import org.apache.log4j.Logger;
import com.ceph.rbd.RbdImage;
import com.eucalyptus.blockstorage.ceph.entities.CephRbdInfo;
public class CephRbdInputStream extends InputStream {
private static final Logger LOG = Logger.getLogger(CephRbdInputStream.class);
private CephRbdConnectionManager conn;
private RbdImage rbdImage;
private long position;
private boolean isOpen;
public CephRbdInputStream(String imageName, String poolName, CephRbdInfo info) throws IOException {
try {
conn = CephRbdConnectionManager.getConnection(info, poolName);
rbdImage = conn.getRbd().open(imageName);
isOpen = true;
position = 0;
} catch (Exception e) {
throw new IOException("Failed to open CephInputStream for image " + imageName + " in pool " + poolName, e);
}
}
@Override
public int read() throws IOException {
if (isOpen) {
byte[] buffer = new byte[1];
int bytesRead = 0;
if ((bytesRead = rbdImage.read(position, buffer, buffer.length)) > 0) { // something was read
position += bytesRead;
return buffer[0];
} else { // nothing was read
return -1;
}
} else {
throw new IOException("Stream is not open/initialized");
}
}
@Override
public int read(byte[] b, int off, int len) throws NullPointerException, IndexOutOfBoundsException, IOException {
if (null == b) {
throw new NullPointerException("Input byte buffer cannot be null");
}
if (off < 0 || len < 0 || len > (b.length - off)) {
throw new IndexOutOfBoundsException("Offset or length cannot be negative. Length cannot be smaller than available size in buffer");
}
if (isOpen) {
byte[] buffer = new byte[len];
int bytesRead = 0;
if ((bytesRead = rbdImage.read(position, buffer, buffer.length)) > 0) { // something was read
position += bytesRead;
for (int i = 0; i < bytesRead; i++) {
b[off + i] = buffer[i];
}
return bytesRead;
} else { // nothing was read
return -1;
}
} else {
throw new IOException("Stream is not open/initialized");
}
}
@Override
public int read(byte[] b) throws NullPointerException, IOException {
if (null == b) {
throw new NullPointerException("Input byte buffer cannot be null");
}
return read(b, 0, b.length);
}
@Override
public void close() {
if (isOpen) {
try {
conn.getRbd().close(rbdImage);
} catch (Exception e) {
} finally {
isOpen = false;
conn.disconnect();
conn = null;
rbdImage = null;
}
} else {
// nothing to do here, stream is not open/already closed
}
}
}