/*****************************************************************************\
 *  reconfigure.c - request that slurmctld shutdown or re-read the 
 *	configuration files
 *****************************************************************************
 *  Copyright (C) 2002 The Regents of the University of California.
 *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
 *  Written by Moe Jette <jette1@llnl.gov> et. al.
 *  UCRL-CODE-2002-040.
 *  
 *  This file is part of SLURM, a resource management program.
 *  For details, see <http://www.llnl.gov/linux/slurm/>.
 *  
 *  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.
 *  
 *  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.,
 *  59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.
\*****************************************************************************/

#ifdef HAVE_CONFIG_H
#  include "config.h"
#endif

#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#include <slurm/slurm.h>

#include "src/common/slurm_protocol_api.h"

static int _send_message_controller (	enum controller_id dest, 
					slurm_msg_t *request_msg );

/*
 * slurm_reconfigure - issue RPC to have Slurm controller (slurmctld)
 *	reload its configuration file 
 * RET 0 or a slurm error code
 */
int
slurm_reconfigure ( void )
{
	int msg_size ;
	int rc ;
	slurm_fd sockfd ;
	slurm_msg_t request_msg ;
	slurm_msg_t response_msg ;
	return_code_msg_t * slurm_rc_msg ;

        /* init message connection for message communication with controller */
	if ( ( sockfd = slurm_open_controller_conn ( ) ) 
			== SLURM_SOCKET_ERROR ) {
		slurm_seterrno ( SLURM_COMMUNICATIONS_CONNECTION_ERROR );
		return SLURM_SOCKET_ERROR ;
	}

	/* send request message */
	request_msg . msg_type = REQUEST_RECONFIGURE ;

	if ( ( rc = slurm_send_controller_msg ( sockfd , & request_msg ) ) 
			== SLURM_SOCKET_ERROR ) {
		slurm_seterrno ( SLURM_COMMUNICATIONS_SEND_ERROR );
		return SLURM_SOCKET_ERROR ;
	}

	/* receive message */
	if ( ( msg_size = slurm_receive_msg ( sockfd , & response_msg ) ) 
			== SLURM_SOCKET_ERROR ) {
		slurm_seterrno ( SLURM_COMMUNICATIONS_RECEIVE_ERROR );
		return SLURM_SOCKET_ERROR ;
	}

	/* shutdown message connection */
	if ( ( rc = slurm_shutdown_msg_conn ( sockfd ) ) 
			== SLURM_SOCKET_ERROR ) {
		slurm_seterrno ( SLURM_COMMUNICATIONS_SHUTDOWN_ERROR );
		return SLURM_SOCKET_ERROR ;
	}
	if ( msg_size )
		return msg_size;

	switch ( response_msg . msg_type )
	{
		case RESPONSE_SLURM_RC:
			slurm_rc_msg = 
				(return_code_msg_t *) response_msg.data ;
			rc = slurm_rc_msg->return_code;
			slurm_free_return_code_msg ( slurm_rc_msg );	
			if (rc) {
				slurm_seterrno ( rc );
				return SLURM_PROTOCOL_ERROR;
			}
			break ;
		default:
			slurm_seterrno ( SLURM_UNEXPECTED_MSG_ERROR );
			return SLURM_PROTOCOL_ERROR;
			break ;
	}

        return SLURM_PROTOCOL_SUCCESS ;
}

/*
 * slurm_ping - issue RPC to have Slurm controller (slurmctld)
 * IN controller - 1==primary controller, 2==secondary controller
 * RET 0 or a slurm error code
 */
int
slurm_ping (int primary)
{
	int rc ;
	slurm_msg_t request_msg ;

	request_msg . msg_type = REQUEST_PING ;

	if (primary == 1)
		rc = _send_message_controller ( PRIMARY_CONTROLLER,
						&request_msg );
	else if (primary == 2)
		rc = _send_message_controller ( SECONDARY_CONTROLLER,
						&request_msg );
	else
		rc = SLURM_ERROR;

	return rc;
}

/*
 * slurm_shutdown - issue RPC to have Slurm controller (slurmctld)
 *	cease operations, both the primary and backup controller 
 *	are shutdown.
 * IN core - controller generates a core file if set
 * RET 0 or a slurm error code
 */
int
slurm_shutdown (uint16_t core)
{
	int rc ;
	slurm_msg_t request_msg ;
	shutdown_msg_t shutdown_msg ;

	/* build shutdown request message */
	shutdown_msg . core = core ;
	request_msg . msg_type = REQUEST_SHUTDOWN ;
	request_msg . data = &shutdown_msg;

	/* explicity send the message to both primary and backup controllers */
	(void) _send_message_controller ( SECONDARY_CONTROLLER, &request_msg );
	rc = _send_message_controller ( PRIMARY_CONTROLLER,   &request_msg );

	return rc;
}

int
_send_message_controller ( enum controller_id dest, slurm_msg_t *request_msg ) 
{
	int rc, msg_size ;
	slurm_fd sockfd ;
	slurm_msg_t response_msg ;
	return_code_msg_t * slurm_rc_msg ;

        /* init message connection for message communication with controller */
	sockfd = slurm_open_controller_conn_spec ( dest );
	if ( sockfd == SLURM_SOCKET_ERROR ) {
		slurm_seterrno ( SLURM_COMMUNICATIONS_CONNECTION_ERROR );
		return SLURM_SOCKET_ERROR ;
	}

	if ( ( rc = slurm_send_controller_msg ( sockfd , request_msg ) ) 
			== SLURM_SOCKET_ERROR ) {
		slurm_seterrno ( SLURM_COMMUNICATIONS_SEND_ERROR );
		return SLURM_SOCKET_ERROR ;
	}

	/* receive message */
	if ( ( msg_size = slurm_receive_msg ( sockfd , & response_msg ) ) 
			== SLURM_SOCKET_ERROR ) {
		slurm_seterrno ( SLURM_COMMUNICATIONS_RECEIVE_ERROR );
		return SLURM_SOCKET_ERROR ;
	}

	/* shutdown message connection */
	if ( ( rc = slurm_shutdown_msg_conn ( sockfd ) ) 
			== SLURM_SOCKET_ERROR ) {
		slurm_seterrno ( SLURM_COMMUNICATIONS_SHUTDOWN_ERROR );
		return SLURM_SOCKET_ERROR ;
	}
	if ( msg_size )
		return msg_size;

	switch ( response_msg . msg_type )
	{
		case RESPONSE_SLURM_RC:
			slurm_rc_msg = 
				( return_code_msg_t * ) response_msg . data ;
			rc = slurm_rc_msg->return_code;
			slurm_free_return_code_msg ( slurm_rc_msg );	
			if (rc) {
				slurm_seterrno ( rc );
				return SLURM_PROTOCOL_ERROR;
			}
			break ;
		default:
			slurm_seterrno ( SLURM_UNEXPECTED_MSG_ERROR );
			return SLURM_PROTOCOL_ERROR;
			break ;
	}

        return SLURM_PROTOCOL_SUCCESS ;
}

