/*************************************************************************
 * 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.
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 *   Redistribution and use of this software in source and binary forms,
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 *     in the documentation and/or other materials provided with the
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 *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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 ************************************************************************/

package com.eucalyptus.blockstorage.ceph;

import java.io.InputStream;
import java.io.OutputStream;

import org.apache.log4j.Logger;

import com.ceph.rbd.RbdImage;
import com.eucalyptus.blockstorage.StorageResource;
import com.eucalyptus.blockstorage.ceph.entities.CephRbdInfo;
import com.eucalyptus.blockstorage.ceph.exceptions.EucalyptusCephException;
import com.eucalyptus.blockstorage.exceptions.UnknownSizeException;

public class CephRbdResource extends StorageResource {

  private static final Logger LOG = Logger.getLogger(CephRbdResource.class);

  private String imageName = null;
  private String poolName = null;
  private CephRbdInfo info = null;

  public CephRbdResource(String id, String path) {
    super(id, path, StorageResource.Type.CEPH);
    info = CephRbdInfo.getStorageInfo();
    String[] poolImage = path.split(CephRbdInfo.POOL_IMAGE_DELIMITER);
    if (poolImage == null || poolImage.length != 2) {
      LOG.warn("Invalid format for path CephImageResource, expected pool/image but got " + path);
      throw new EucalyptusCephException("Invalid format for path CephImageResource, expected pool/image but got " + path);
    } else {
      poolName = poolImage[0];
      imageName = poolImage[1];
    }
  }

  @Override
  public Boolean isDownloadSynchronous() {
    return Boolean.FALSE;
  }

  @Override
  public Long getSize() throws UnknownSizeException {
    try (CephRbdConnectionManager conn = CephRbdConnectionManager.getConnection(info, poolName)) {
      RbdImage rbdImage = null;
      try {
        rbdImage = conn.getRbd().open(imageName);
        return rbdImage.stat().size;
      } finally {
        if (rbdImage != null) {
          conn.getRbd().close(rbdImage);
        }
      }
    } catch (Exception e) {
      throw new UnknownSizeException("Failed to determine size of ceph image " + imageName + " in pool " + poolName, e);
    }
  }

  @Override
  public InputStream getInputStream() throws Exception {
    return new CephRbdInputStream(imageName, poolName, info);
  }

  @Override
  public OutputStream getOutputStream() throws Exception {
    return new CephRbdOutputStream(imageName, poolName, info);
  }
}