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one/include/Host.h

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/* ------------------------------------------------------------------------ */
/* Copyright 2002-2010, 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 HOST_H_
#define HOST_H_
#include "PoolSQL.h"
#include "HostShare.h"
#include "HostTemplate.h"
using namespace std;
/**
* The Host class.
*/
class Host : public PoolObjectSQL
{
public:
// ----------------------------------------------------------------------
// Host States
// ----------------------------------------------------------------------
enum HostState
{
INIT = 0, /**< Initial state for enabled hosts. */
MONITORING = 1, /**< The host is being monitored. */
MONITORED = 2, /**< The host has been successfully monitored. */
ERROR = 3, /**< An error ocurrer while monitoring the host. */
DISABLED = 4 /**< The host is disabled won't be monitored. */
};
/**
* Function to write a Host on an output stream
*/
friend ostream& operator<<(ostream& os, Host& h);
/**
* Function to print the Host object into a string in plain text
* @param str the resulting string
* @return a reference to the generated string
*/
string& to_str(string& str) const;
/**
* Function to print the Host 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;
/**
* Get the Host unique identifier HID, that matches the OID of the object
* @return HID Host identifier
*/
int get_hid() const
{
return oid;
};
/**
* Check if the host is enabled
* @return true if the host is enabled
*/
bool isEnabled() const
{
return state != DISABLED;
}
/**
* Updates the Host's last_monitored time stamp.
* @param success if the monitored action was successfully performed
*/
void touch(bool success)
{
last_monitored = time(0);
if ( state != DISABLED) //Don't change the state is host is disabled
{
if (success == true)
{
state = MONITORED;
}
else
{
state = ERROR;
}
}
};
/**
* Disables the current host, it will not be monitored nor used by the
* scheduler
*/
void disable()
{
state = DISABLED;
};
/**
* Enables the current host, it will be monitored and could be used by
* the scheduler
*/
void enable()
{
state = INIT;
};
/**
* Returns host host_name
* @return host_name Host's hostname
*/
const string& get_hostname() const
{
return hostname;
};
/** Update host counters and update the whole host on the DB
* @param parse_str string with values to be parsed
* @return 0 on success
**/
int update_info(string &parse_str);
/**
* Retrives host state
* @return HostState code number
*/
HostState get_state() const
{
return state;
};
/**
* Retrives VMM mad name
* @return string vmm mad name
*/
const string& get_vmm_mad() const
{
return vmm_mad_name;
};
/**
* Retrives TM mad name
* @return string tm mad name
*/
const string& get_tm_mad() const
{
return tm_mad_name;
};
/**
* Retrives IM mad name
* @return string im mad name
*/
const string& get_im_mad() const
{
return im_mad_name;
};
/**
* Sets host state
* @param HostState state that applies to this host
*/
void set_state(HostState state)
{
this->state = state;
};
/**
* Retrives last time the host was monitored
* @return time_t last monitored time
*/
time_t get_last_monitored() const
{
return last_monitored;
};
// ------------------------------------------------------------------------
// Template
// ------------------------------------------------------------------------
/**
* Gets the values of a template attribute
* @param name of the attribute
* @param values of the attribute
* @return the number of values
*/
int get_template_attribute(
string& name,
vector<const Attribute*>& values) const
{
return host_template.get(name,values);
};
/**
* Gets the values of a template attribute
* @param name of the attribute
* @param values of the attribute
* @return the number of values
*/
int get_template_attribute(
const char *name,
vector<const Attribute*>& values) const
{
string str=name;
return host_template.get(str,values);
};
/**
* Gets a string based host attribute
* @param name of the attribute
* @param value of the attribute (a string), will be "" if not defined
*/
void get_template_attribute(
const char * name,
string& value) const
{
string str=name;
host_template.get(str,value);
}
/**
* Gets a string based host attribute
* @param name of the attribute
* @param value of the attribute (an int), will be 0 if not defined
*/
void get_template_attribute(
const char * name,
int& value) const
{
string str=name;
host_template.get(str,value);
}
// ---------------------------------------------------------
// Lex & bison parser for requirements and rank expressions
// ---------------------------------------------------------
/**
* Evaluates a requirement expression on the given host.
* @param requirements string
* @param result true if the host matches the requirements
* @param errmsg string describing the error, must be freed by the
* calling function
* @return 0 on success
*/
int match(const string& requirements, bool& result, char **errmsg);
/**
* Evaluates a rank expression on the given host.
* @param rank string
* @param result of the rank evaluation
* @param errmsg string describing the error, must be freed by the
* calling function
* @return 0 on success
*/
int rank(const string& rank, int& result, char **errmsg);
// ------------------------------------------------------------------------
// Share functions
// ------------------------------------------------------------------------
/**
*
*
*/
int get_share_running_vms()
{
return host_share.running_vms;
}
int get_share_disk_usage()
{
return host_share.disk_usage;
}
int get_share_mem_usage()
{
return host_share.mem_usage;
}
int get_share_cpu_usage()
{
return host_share.cpu_usage;
}
int get_share_max_disk()
{
return host_share.max_disk;
}
int get_share_max_mem()
{
return host_share.max_mem;
}
int get_share_max_cpu()
{
return host_share.max_cpu;
}
int get_share_free_disk()
{
return host_share.free_disk;
}
int get_share_free_mem()
{
return host_share.free_mem;
}
int get_share_free_cpu()
{
return host_share.free_cpu;
}
int get_share_used_disk()
{
return host_share.used_disk;
}
int get_share_used_mem()
{
return host_share.used_mem;
}
int get_share_used_cpu()
{
return host_share.used_cpu;
}
/**
* Adds a new VM to the given share by icrementing the cpu,mem and disk
* counters
* @param cpu needed by the VM (percentage)
* @param mem needed by the VM (in Kb)
* @param disk needed by the VM
* @return 0 on success
*/
void add_capacity(int cpu, int mem, int disk)
{
host_share.add(cpu,mem,disk);
};
/**
* Deletes a new VM from the given share by decrementing the cpu,mem and
* disk counters
* @param cpu useded by the VM (percentage)
* @param mem used by the VM (in Kb)
* @param disk used by the VM
* @return 0 on success
*/
void del_capacity(int cpu, int mem, int disk)
{
host_share.del(cpu,mem,disk);
};
/**
* Tests whether a new VM can be hosted by the host or not
* @param cpu needed by the VM (percentage)
* @param mem needed by the VM (in Kb)
* @param disk needed by the VM
* @return true if the share can host the VM
*/
bool test_capacity(int cpu, int mem, int disk)
{
return host_share.test(cpu,mem,disk);
}
private:
// -------------------------------------------------------------------------
// Friends
// -------------------------------------------------------------------------
friend class HostPool;
// -------------------------------------------------------------------------
// Host Description
// -------------------------------------------------------------------------
string hostname;
/**
* The state of the Host
*/
HostState state;
/**
* Name of the IM driver used to monitor this host
*/
string im_mad_name;
/**
* Name of the VM driver used to execute VMs in this host
*/
string vmm_mad_name;
/**
* Name of the TM driver used to transfer file to and from this host
*/
string tm_mad_name;
/**
* If Host State = MONITORED last time it got fully monitored or 1 Jan 1970
* Host State = MONITORING last time it got a signal to be monitored
*/
time_t last_monitored;
// -------------------------------------------------------------------------
// Host Attributes
// -------------------------------------------------------------------------
/**
* The Host template, holds the Host attributes.
*/
HostTemplate host_template;
/**
* The Share represents the logical capacity associated with the host
*/
HostShare host_share;
// -------------------------------------------------------------------------
// Lex & bison
// -------------------------------------------------------------------------
/**
* Mutex to perform just one flex-bison parsing at a time
*/
static pthread_mutex_t lex_mutex;
// *************************************************************************
// DataBase implementation (Private)
// *************************************************************************
/**
* Execute an INSERT or REPLACE Sql query.
* @param db The SQL DB
* @param replace Execute an INSERT or a REPLACE
* @return 0 one success
*/
int insert_replace(SqlDB *db, bool replace);
/**
* Callback function to unmarshall a Host object (Host::select)
* @param num the number of columns read from the DB
* @param names the column names
* @param vaues the column values
* @return 0 on success
*/
int select_cb(void *nil, int num, char **values, char **names);
/**
* Bootstraps the database table(s) associated to the Host
*/
static void bootstrap(SqlDB * db)
{
ostringstream oss_host(Host::db_bootstrap);
ostringstream oss_share(HostShare::db_bootstrap);
ostringstream oss_templ(HostTemplate::db_bootstrap);
db->exec(oss_host);
db->exec(oss_share);
db->exec(oss_templ);
};
protected:
// *************************************************************************
// Constructor
// *************************************************************************
Host(int id=-1,
string _hostname="",
string _im_mad_name="",
string _vmm_mad_name="",
string _tm_mad_name="");
virtual ~Host();
// *************************************************************************
// DataBase implementation
// *************************************************************************
enum ColNames
{
OID = 0,
HOST_NAME = 1,
STATE = 2,
IM_MAD = 3,
VM_MAD = 4,
TM_MAD = 5,
LAST_MON_TIME = 6,
LIMIT = 7
};
static const char * db_names;
static const char * db_bootstrap;
static const char * table;
/**
* Reads the Host (identified with its OID=HID) from the database.
* @param db pointer to the db
* @return 0 on success
*/
virtual int select(SqlDB *db);
/**
* Writes the Host and its associated HostShares in the database.
* @param db pointer to the db
* @return 0 on success
*/
virtual int insert(SqlDB *db);
/**
* Writes/updates the Hosts data fields in the database.
* @param db pointer to the db
* @return 0 on success
*/
virtual int update(SqlDB *db);
/**
* Drops host from the database
* @param db pointer to the db
* @return 0 on success
*/
virtual int drop(SqlDB *db);
/**
* Function to output a Host object in to an stream in XML format
* @param oss the output stream
* @param num the number of columns read from the DB
* @param names the column names
* @param vaues the column values
* @return 0 on success
*/
static int dump(ostringstream& oss, int num, char **values, char **names);
};
#endif /*HOST_H_*/
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