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one/include/Image.h

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/* ------------------------------------------------------------------------ */
/* Copyright 2002-2011, OpenNebula Project Leads (OpenNebula.org) */
/* */
/* Licensed 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. */
/* -------------------------------------------------------------------------*/
#ifndef IMAGE_H_
#define IMAGE_H_
#include "PoolSQL.h"
#include "ImageTemplate.h"
#include "NebulaLog.h"
using namespace std;
/**
* The Image class.
*/
class Image : public PoolObjectSQL
{
public:
/**
* Type of Images
*/
enum ImageType
{
OS = 0, /** < Base OS image */
CDROM = 1, /** < An ISO9660 image */
DATABLOCK = 2 /** < User persistent data device */
};
/**
* Image State
*/
enum ImageState
{
INIT = 0, /** < Initialization state */
READY = 1, /** < Image ready to use */
USED = 2, /** < Image in use */
DISABLED = 3, /** < Image can not be instantiated by a VM */
LOCKED = 4, /** < FS operation for the Image in process */
ERROR = 5 /** < Error state the operation FAILED*/
};
// *************************************************************************
// Image Public Methods
// *************************************************************************
/**
* Function to print the Image object into a string in XML format
* @param xml the resulting XML string
* @return a reference to the generated string
*/
string& to_xml(string& xml) const;
/**
* Rebuilds the object from an xml formatted string
* @param xml_str The xml-formatted string
*
* @return 0 on success, -1 otherwise
*/
int from_xml(const string &xml_str);
/**
* Returns true if the image is persistent
* @return true if the image is persistent
*/
bool isPersistent() const
{
return (persistent_img == 1);
};
/**
* Returns the source path of the image
* @return source of image
*/
const string& get_source() const
{
return source;
}
/**
* Returns the original path of the image
* @return path of image
*/
const string& get_path() const
{
return path;
}
/**
* Returns the fs_type for the image (defined for datablocks)
* @return fs_type
*/
const string& get_fstype() const
{
return fs_type;
}
/**
* Returns the size of the image
* @return size in mb
*/
int get_size() const
{
return size_mb;
}
/**
* Sets the source path of the image
*/
void set_source(const string& _source)
{
source = _source;
}
/**
* Sets the size for the image
*/
void set_size(unsigned int _size_mb)
{
size_mb = _size_mb;
}
/**
* Returns the type of the image
* @return type
*/
ImageType get_type()
{
return type;
}
/**
* Returns the image state
* @return state of image
*/
ImageState get_state()
{
return state;
}
/**
* Sets the image state
* @param state of image
*/
void set_state(ImageState _state)
{
state = _state;
}
/**
*
*/
int dec_running ()
{
return --running_vms;
}
/**
*
*/
int inc_running()
{
return ++running_vms;
}
/**
*
*/
int get_running()
{
return running_vms;
}
/**
* Sets the Image type.
*
* @param _type the new type. It will be transformed to upper case
* @return 0 on success, -1 otherwise
*/
int set_type(string& _type);
/**
* Publish or unpublish an image
* @param pub true to publish the image
* @return 0 on success
*/
int publish(bool pub)
{
int rc = -1;
if (pub == true)
{
if (!isPersistent())
{
public_obj = 1;
rc = 0;
}
}
else
{
public_obj = 0;
rc = 0;
}
return rc;
}
/**
* Set/Unset an image as persistent
* @param persistent true to make an image persistent
* @param error_str Returns the error reason, if any
*
* @return 0 on success
*/
int persistent(bool persis, string& error_str)
{
if ( running_vms != 0 )
{
goto error_vms;
}
if (persis == true)
{
if ( isPublic() )
{
goto error_public;
}
persistent_img = 1;
}
else
{
persistent_img = 0;
}
return 0;
error_vms:
error_str = "Image cannot be in 'used' state.";
goto error_common;
error_public:
error_str = "Image cannot be public and persistent.";
goto error_common;
error_common:
return -1;
}
/**
* Modifies the given disk attribute adding the following attributes:
* * SOURCE: the file-path.
* * BUS: will only be set if the Image's definition includes it.
* * TARGET: the value set depends on:
* - OS images will be mounted at prefix + a: hda, sda.
* - Prefix + b is reserved for the contex cdrom.
* - CDROM images will be at prefix + c: hdc, sdc.
* - Several DATABLOCK images can be mounted, they will be set to
* prefix + (d + index) : hdd, hde, hdf...
* @param disk attribute for the VM template
* @param index number of datablock images used by the same VM. Will be
* automatically increased.
* @param img_type will be set to the used image's type
*/
int disk_attribute(VectorAttribute * disk, int* index, ImageType* img_type);
/**
* Factory method for image templates
*/
Template * get_new_template()
{
return new ImageTemplate;
}
private:
// -------------------------------------------------------------------------
// Friends
// -------------------------------------------------------------------------
friend class ImagePool;
// -------------------------------------------------------------------------
// Image Description
// -------------------------------------------------------------------------
/**
* Type of the Image
*/
ImageType type;
/**
* Persistency of the Image
*/
int persistent_img;
/**
* Registration time
*/
time_t regtime;
/**
* Path to the image
*/
string source;
/**
* Original Path to the image (optional if source is given or datablock)
*/
string path;
/**
* File system type for the image (mandatory for datablocks)
*/
string fs_type;
/**
* Size of the image in MB
*/
unsigned int size_mb;
/**
* Image state
*/
ImageState state;
/**
* Number of VMs using the image
*/
int running_vms;
// *************************************************************************
// DataBase implementation (Private)
// *************************************************************************
/**
* Execute an INSERT or REPLACE Sql query.
* @param db The SQL DB
* @param replace Execute an INSERT or a REPLACE
* @param error_str Returns the error reason, if any
* @return 0 on success
*/
int insert_replace(SqlDB *db, bool replace, string& error_str);
/**
* Bootstraps the database table(s) associated to the Image
* @return 0 on success
*/
static int bootstrap(SqlDB * db)
{
ostringstream oss_image(Image::db_bootstrap);
return db->exec(oss_image);
};
/**
* "Encrypts" the password with SHA1 digest
* @param password
* @return sha1 encrypted password
*/
static string sha1_digest(const string& pass);
protected:
// *************************************************************************
// Constructor
// *************************************************************************
Image(int uid,
int gid,
const string& uname,
const string& gname,
ImageTemplate* img_template);
virtual ~Image();
// *************************************************************************
// DataBase implementation
// *************************************************************************
static const char * db_names;
static const char * db_bootstrap;
static const char * table;
/**
* Writes the Image in the database.
* @param db pointer to the db
* @return 0 on success
*/
virtual int insert(SqlDB *db, string& error_str);
/**
* Writes/updates the Images data fields in the database.
* @param db pointer to the db
* @return 0 on success
*/
virtual int update(SqlDB *db);
};
#endif /*IMAGE_H_*/
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