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307 lines
8.1 KiB
C++
307 lines
8.1 KiB
C++
/* ------------------------------------------------------------------------ */
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/* Copyright 2002-2013, OpenNebula Project (OpenNebula.org), C12G Labs */
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/* */
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/* Licensed under the Apache License, Version 2.0 (the "License"); you may */
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/* not use this file except in compliance with the License. You may obtain */
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/* a copy of the License at */
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/* */
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/* http://www.apache.org/licenses/LICENSE-2.0 */
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/* */
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/* Unless required by applicable law or agreed to in writing, software */
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/* distributed under the License is distributed on an "AS IS" BASIS, */
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/* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. */
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/* See the License for the specific language governing permissions and */
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/* limitations under the License. */
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/* -------------------------------------------------------------------------*/
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#ifndef DATASTORE_H_
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#define DATASTORE_H_
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#include "PoolSQL.h"
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#include "ObjectCollection.h"
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#include "DatastoreTemplate.h"
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#include "Clusterable.h"
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#include "Image.h"
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/**
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* The Datastore class.
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*/
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class Datastore : public PoolObjectSQL, ObjectCollection, public Clusterable
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{
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public:
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/**
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* Type of Datastore
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*/
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enum DatastoreType
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{
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IMAGE_DS = 0, /** < Standard datastore for disk images */
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SYSTEM_DS = 1, /** < System datastore for disks of running VMs */
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FILE_DS = 2 /** < File datastore for context, kernel, initrd files */
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};
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/**
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* Return the string representation of a DatastoreType
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* @param ob the type
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* @return the string
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*/
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static string type_to_str(DatastoreType ob)
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{
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switch (ob)
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{
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case IMAGE_DS: return "IMAGE_DS" ; break;
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case SYSTEM_DS: return "SYSTEM_DS" ; break;
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case FILE_DS: return "FILE_DS" ; break;
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default: return "";
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}
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};
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/**
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* Return the string representation of a DatastoreType
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* @param str_type string representing the DatastoreTypr
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* @return the DatastoreType (defaults to IMAGE_DS)
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*/
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static DatastoreType str_to_type(string& str_type);
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/**
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* Function to print the Datastore object into a string in XML format
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* @param xml the resulting XML string
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* @return a reference to the generated string
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*/
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string& to_xml(string& xml) const;
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/**
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* Rebuilds the object from an xml formatted string
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* @param xml_str The xml-formatted string
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*
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* @return 0 on success, -1 otherwise
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*/
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int from_xml(const string &xml_str);
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/**
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* Adds this image's ID to the set.
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* @param id of the image to be added to the Datastore
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* @return 0 on success
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*/
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int add_image(int id)
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{
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return add_collection_id(id);
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};
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/**
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* Deletes this image's ID from the set.
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* @param id of the image to be deleted from the Datastore
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* @return 0 on success
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*/
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int del_image(int id)
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{
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return del_collection_id(id);
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};
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/**
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* Retrieves TM mad name
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* @return string tm mad name
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*/
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const string& get_tm_mad() const
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{
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return tm_mad;
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};
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/**
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* Retrieves the base path
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* @return base path string
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*/
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const string& get_base_path() const
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{
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return base_path;
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};
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/**
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* Retrieves the disk type
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* @return disk type
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*/
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Image::DiskType get_disk_type() const
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{
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return disk_type;
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};
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/**
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* Returns the datastore type
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* @return datastore type
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*/
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DatastoreType get_type() const
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{
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return type;
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};
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/**
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* Modifies the given VM disk attribute adding the relevant datastore
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* attributes
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*
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* @param disk
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* @return 0 on success
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*/
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int disk_attribute(VectorAttribute * disk);
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/**
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* Replace template for this object. Object should be updated
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* after calling this method
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* @param tmpl string representation of the template
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*/
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int replace_template(const string& tmpl_str, string& error);
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/**
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* Set monitor information for the Datastore
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* @param total_mb
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* @param free_mb
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* @param used_mb
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*/
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void update_monitor(unsigned int total, unsigned int free, unsigned int used)
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{
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total_mb = total;
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free_mb = free;
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used_mb = used;
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}
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unsigned int get_avail_mb()
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{
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float max_used_size;
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if (get_template_attribute("MAX_USED_SIZE", max_used_size))
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{
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if (used_mb >= (unsigned int) max_used_size)
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{
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return 0;
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}
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}
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return free_mb;
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}
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private:
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// -------------------------------------------------------------------------
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// Friends
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// -------------------------------------------------------------------------
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friend class DatastorePool;
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// *************************************************************************
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// Datastore Private Attributes
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// *************************************************************************
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/**
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* Name of the datastore driver used to register new images
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*/
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string ds_mad;
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/**
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* Name of the TM driver used to transfer file to and from the hosts
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*/
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string tm_mad;
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/**
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* Base path for the storage
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*/
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string base_path;
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/**
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* The datastore type
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*/
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DatastoreType type;
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/**
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* Disk types for the Images created in this datastore
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*/
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Image::DiskType disk_type;
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/**
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* Total datastore capacity in MB
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*/
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unsigned int total_mb;
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/**
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* Available datastore capacity in MB
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*/
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unsigned int free_mb;
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/**
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* Used datastore capacity in MB
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*/
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unsigned int used_mb;
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// *************************************************************************
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// Constructor
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// *************************************************************************
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Datastore(
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int uid,
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int gid,
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const string& uname,
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const string& gname,
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int umask,
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DatastoreTemplate* ds_template,
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int cluster_id,
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const string& cluster_name,
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const string& ds_location);
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virtual ~Datastore(){};
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// *************************************************************************
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// DataBase implementation (Private)
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// *************************************************************************
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static const char * db_names;
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static const char * db_bootstrap;
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static const char * table;
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/**
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* Execute an INSERT or REPLACE Sql query.
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* @param db The SQL DB
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* @param replace Execute an INSERT or a REPLACE
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* @param error_str Returns the error reason, if any
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* @return 0 one success
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*/
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int insert_replace(SqlDB *db, bool replace, string& error_str);
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/**
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* Bootstraps the database table(s) associated to the Datastore
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* @return 0 on success
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*/
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static int bootstrap(SqlDB * db)
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{
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ostringstream oss(Datastore::db_bootstrap);
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return db->exec(oss);
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};
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/**
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* Writes the Datastore in the database.
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* @param db pointer to the db
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* @return 0 on success
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*/
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int insert(SqlDB *db, string& error_str);
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/**
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* Writes/updates the Datastore's data fields in the database.
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* @param db pointer to the db
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* @return 0 on success
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*/
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int update(SqlDB *db)
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{
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string error_str;
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return insert_replace(db, true, error_str);
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}
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/**
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* Factory method for datastore templates
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*/
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Template * get_new_template() const
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{
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return new DatastoreTemplate;
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}
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};
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#endif /*DATASTORE_H_*/
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