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/*
* Copyright (C) 2011 Tildeslash Ltd. All rights reserved.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3.
*
* 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/>.
*
* In addition, as a special exception, the copyright holders give
* permission to link the code of portions of this program with the
* OpenSSL library under certain conditions as described in each
* individual source file, and distribute linked combinations
* including the two.
*
* You must obey the GNU General Public License in all respects
* for all of the code used other than OpenSSL. If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. If you
* do not wish to do so, delete this exception statement from your
* version. If you delete this exception statement from all source
* files in the program, then also delete it here.
*/
#ifndef MONIT_STATE_H
#define MONIT_STATE_H
/**
* Manage service information persistently. Service data is saved to
* a state file when monit runs in daemon mode for each poll
* cycle. Monit use this file to recover from a crash or to maintain
* service data persistently during a reload. The location of the
* state file may be set from the command line or set in the monitrc
* file, if not set, the default is ~/.monit.state.
*
* @author Jan-Henrik Haukeland, <hauk@tildeslash.com>
* @file
*/
/**
* Save service state information to the state file
*/
void State_save();
/**
* Check if we should update current services with persistent state
* information. The logic is as follows: Iff a state file is present
* *and* older than the running monit daemon's lock file we have had a
* crash and should update data from the state file.
* @return TRUE if the state should be updated otherwise FALSE
*/
int State_shouldUpdate();
/**
* Update the current service list with data from the state file. We
* do *only* change services found in *both* the monitrc file and in
* the state file. The algorithm:
*
* Assume the control file was changed and a new service (B) was added
* so the monitrc file now contains the services: A B and C. The
* running monit daemon only knows the services A and C. Upon restart
* after a crash the monit daemon first read the monitrc file and
* creates the service list structure with A B and C. We then read the
* state file and update the service A and C since they are found in
* the state file, B is not found in this file and therefore not
* changed.
*
* The same strategy is used if a service was removed, e.g. if the
* service A was removed from monitrc; when reading the state file,
* service A is not found in the current service list (the list is
* always generated from monitrc) and therefore A is simply discarded.
*
* Finally, after the monit service state is updated this function
* writes the new state file.
*/
void State_update();
#endif
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