/*************************************************************************
* 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;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import org.apache.commons.lang.StringUtils;
import org.apache.log4j.Logger;
import com.eucalyptus.blockstorage.exceptions.UnknownSizeException;
import com.eucalyptus.blockstorage.util.StorageProperties;
import edu.ucsb.eucalyptus.util.SystemUtil;
import edu.ucsb.eucalyptus.util.SystemUtil.CommandOutput;
public class BlockDeviceResource extends StorageResource {
private static final int ATTEMPTS = 10;
private static Logger LOG = Logger.getLogger(BlockDeviceResource.class);
public BlockDeviceResource(String id, String name) {
super(id, name, StorageResource.Type.BLOCK);
}
@Override
public Long getSize() throws UnknownSizeException {
Long size = 0L;
try {
CommandOutput result =
SystemUtil.runWithRawOutput(new String[] {StorageProperties.EUCA_ROOT_WRAPPER, "blockdev", "--getsize64", this.getPath()});
size = Long.parseLong(StringUtils.trimToEmpty(result.output));
return size;
} catch (Exception e) {
throw new UnknownSizeException("Failed to determine size for " + this.getId() + " mounted at " + this.getPath(), e);
}
}
@Override
public InputStream getInputStream() throws FileNotFoundException {
return new FileInputStream(new File(this.getPath()));
}
@Override
public OutputStream getOutputStream() throws IOException {
FileOutputStream outStream = null;
int failedAttempts = 0;
do {
try {
outStream = new FileOutputStream(new File(this.getPath()));
return outStream;
} catch (FileNotFoundException e) { // Output stream to block devices may throw permission denied error, retry a few times
if ((++failedAttempts) < ATTEMPTS) {
LOG.debug("Failed to open FileOutputStream for " + this.getId() + " mounted at " + this.getPath() + ". Will retry");
} else {
LOG.warn("Failed to open FileOutputStream for " + this.getId() + " mounted at " + this.getPath() + " after " + failedAttempts + " attempts");
throw e;
}
}
} while (failedAttempts < ATTEMPTS);
throw new IOException("Failed to open FileOutputStream for " + this.getId() + " mounted at " + this.getPath());
}
@Override
public Boolean isDownloadSynchronous() {
return Boolean.TRUE;
}
}