/*****************************************************************************\
 *  route_default.c - default version of route plugin
 *****************************************************************************
 *  Copyright (C) 2014 Bull S. A. S.
 *		Bull, Rue Jean Jaures, B.P.68, 78340, Les Clayes-sous-Bois.
 *
 *  Written by Rod Schultz <rod.schultz@bull.com>
 *
 *  This file is part of Slurm, a resource management program.
 *  For details, see <https://slurm.schedmd.com/>.
 *  Please also read the included file: DISCLAIMER.
 *
 *  Slurm 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; either version 2 of the License, or (at your option)
 *  any later version.
 *
 *  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.
 *
 *  Slurm 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 Slurm; if not, write to the Free Software Foundation, Inc.,
 *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA.
\*****************************************************************************/

#include <signal.h>
#include <stdlib.h>
#include <sys/types.h>

#include "slurm/slurm_errno.h"
#include "src/common/slurm_xlator.h"
#include "src/common/forward.h"
#include "src/common/node_conf.h"
#include "src/common/slurm_protocol_defs.h"

/*
 * These variables are required by the generic plugin interface.  If they
 * are not found in the plugin, the plugin loader will ignore it.
 *
 * plugin_name - a string giving a human-readable description of the
 * plugin.  There is no maximum length, but the symbol must refer to
 * a valid string.
 *
 * plugin_type - a string suggesting the type of the plugin or its
 * applicability to a particular form of data or method of data handling.
 * If the low-level plugin API is used, the contents of this string are
 * unimportant and may be anything.  Slurm uses the higher-level plugin
 * interface which requires this string to be of the form
 *
 *      <application>/<method>
 *
 * where <application> is a description of the intended application of
 * the plugin (e.g., "task" for task control) and <method> is a description
 * of how this plugin satisfies that application.  Slurm will only load
 * a task plugin if the plugin_type string has a prefix of "task/".
 *
 * plugin_version - an unsigned 32-bit integer containing the Slurm version
 * (major.minor.micro combined into a single number).
 */
const char plugin_name[]        = "route default plugin";
const char plugin_type[]        = "route/default";
const uint32_t plugin_version   = SLURM_VERSION_NUMBER;


/*****************************************************************************\
 *  Functions required of all plugins
\*****************************************************************************/
/*
 * init() is called when the plugin is loaded, before any other functions
 *	are called.  Put global initialization here.
 */
extern int init(void)
{
	verbose("%s loaded", plugin_name);
	return SLURM_SUCCESS;
}
/*
 * fini() is called when the plugin is removed. Clear any allocated
 *	storage here.
 */
extern int fini(void)
{
	return SLURM_SUCCESS;
}

/*****************************************************************************\
 *  Plugin API Implementations
\*****************************************************************************/

/*
 * route_p_split_hostlist  - logic to split an input hostlist into
 *                           a set of hostlists to forward to.
 *
 * IN: hl        - hostlist_t   - list of every node to send message to
 *                                will be empty on return;
 * OUT: sp_hl    - hostlist_t** - the array of hostlist that will be malloced
 * OUT: count    - int*         - the count of created hostlist
 * RET: SLURM_SUCCESS - int
 *
 * Note: created hostlist will have to be freed independently using
 *       hostlist_destroy by the caller.
 * Note: the hostlist_t array will have to be xfree.
 */
extern int route_p_split_hostlist(hostlist_t hl,
				  hostlist_t** sp_hl,
				  int* count, uint16_t tree_width)
{
	return route_split_hostlist_treewidth(hl, sp_hl, count, tree_width);
}

/*
 * route_g_reconfigure - reset during reconfigure
 *
 * RET: SLURM_SUCCESS - int
 */
extern int route_p_reconfigure (void)
{
	return SLURM_SUCCESS;
}

/*
 * route_p_next_collector - return address of next collector
 *
 * IN: is_collector - bool* - flag indication if this node is a collector
 *
 * RET: slurm_addr_t* - address of node to send messages to be aggregated.
 */
extern slurm_addr_t* route_p_next_collector ( bool *is_collector )
{
	return route_next_collector(is_collector);
}

/*
 * route_g_next_collector_backup
 *
 * RET: slurm_addr_t* - address of backup node to send messages to be aggregated.
 */
extern slurm_addr_t* route_p_next_collector_backup ( void )
{
	/* return NULL until we have a clearly defined backup.
	 * Otherwise we could get into a sending loop if the primary
	 * fails with us sending to a sibling that may have me as a
	 * parent.
	 */
	return NULL;
}
