pacemaker/extra/resources/Stateful

#!/bin/sh
#
#
#	Example of a stateful OCF Resource Agent. 
#
# Copyright (c) 2006 Andrew Beekhof
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of version 2 of the GNU General Public License as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it would be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
#
# Further, this software is distributed without any warranty that it is
# free of the rightful claim of any third person regarding infringement
# or the like.  Any license provided herein, whether implied or
# otherwise, applies only to this software file.  Patent licenses, if
# any, provided herein do not apply to combinations of this program with
# other software, or any other product whatsoever.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write the Free Software Foundation,
# Inc., 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
#

#######################################################################
# Initialization:

: ${OCF_FUNCTIONS=${OCF_ROOT}/resource.d/heartbeat/.ocf-shellfuncs}
. ${OCF_FUNCTIONS}
: ${__OCF_ACTION=$1}
CRM_MASTER="${HA_SBIN_DIR}/crm_master -l reboot"

#######################################################################

meta_data() {
	cat <<END
<?xml version="1.0"?>
<!DOCTYPE resource-agent SYSTEM "ra-api-1.dtd">
<resource-agent name="Stateful" version="1.0">
<version>1.0</version>

<longdesc lang="en">
This is an example resource agent that implements two states
</longdesc>
<shortdesc lang="en">Example stateful resource agent</shortdesc>

<parameters>

<parameter name="state" unique="1">
<longdesc lang="en">
Location to store the resource state in
</longdesc>
<shortdesc lang="en">State file</shortdesc>
<content type="string" default="${HA_VARRUN%%/}/Stateful-${OCF_RESOURCE_INSTANCE}.state" />
</parameter>

<parameter name="envfile" unique="1">
<longdesc lang="en">
If this is set, the environment will be dumped to this file for every call.
</longdesc>
<shortdesc lang="en">Environment dump file</shortdesc>
<content type="string" default="" />
</parameter>

</parameters>

<actions>
<action name="start"   timeout="20" />
<action name="stop"    timeout="20" />
<action name="monitor" depth="0"  timeout="20" interval="10" role="Master"/>
<action name="monitor" depth="0"  timeout="20" interval="10" role="Slave"/>
<action name="notify"  timeout="5" />
<action name="meta-data"  timeout="5" />
<action name="validate-all"  timeout="30" />
</actions>
</resource-agent>
END
	exit $OCF_SUCCESS
}

#######################################################################

stateful_usage() {
	cat <<END
usage: $0 {start|stop|promote|demote|monitor|validate-all|meta-data}

Expects to have a fully populated OCF RA-compliant environment set.
END
	exit $1
}

stateful_update() {
	echo $1 > ${OCF_RESKEY_state}
}

stateful_check_state() {
    target=$1
    if [ -f ${OCF_RESKEY_state} ]; then
	state=`cat ${OCF_RESKEY_state}`
	if [ "x$target" = "x$state" ]; then
	    return 0
	fi

    else
	if [ "x$target" = "x" ]; then
	    return 0
	fi
    fi

    return 1
}

dump_env() {
    if [ "${OCF_RESKEY_envfile}" != "" ]; then
            echo "### ${__OCF_ACTION} @ $(date) ###
$(env | sort)
###" >> "${OCF_RESKEY_envfile}"
    fi
}

stateful_start() {
    stateful_check_state master
    if [ $? = 0 ]; then
       	# CRM Error - Should never happen
	return $OCF_RUNNING_MASTER
    fi
    stateful_update slave
    $CRM_MASTER -v ${slave_score}
    return 0
}

stateful_demote() {
    stateful_check_state 
    if [ $? = 0 ]; then
       	# CRM Error - Should never happen
	return $OCF_NOT_RUNNING
    fi
    stateful_update slave
    $CRM_MASTER -v ${slave_score}
    return 0
}

stateful_promote() {
    stateful_check_state 
    if [ $? = 0 ]; then
	return $OCF_NOT_RUNNING
    fi
    stateful_update master
    $CRM_MASTER -v ${master_score}
    return 0
}

stateful_stop() {
    $CRM_MASTER -D
    stateful_check_state master
    if [ $? = 0 ]; then
       	# CRM Error - Should never happen
	return $OCF_RUNNING_MASTER
    fi
    if [ -f ${OCF_RESKEY_state} ]; then
	rm ${OCF_RESKEY_state}
    fi
    return 0
}

stateful_monitor() {
    stateful_check_state "master"
    if [ $? = 0 ]; then
	if [ $OCF_RESKEY_CRM_meta_interval = 0 ]; then
	    # Restore the master setting during probes
	    $CRM_MASTER -v ${master_score}
	fi
	return $OCF_RUNNING_MASTER
    fi

    stateful_check_state "slave"
    if [ $? = 0 ]; then
	if [ $OCF_RESKEY_CRM_meta_interval = 0 ]; then
	    # Restore the master setting during probes
	    $CRM_MASTER -v ${slave_score}
	fi
	return $OCF_SUCCESS
    fi

    if [ -f ${OCF_RESKEY_state} ]; then
	echo "File '${OCF_RESKEY_state}' exists but contains unexpected contents"
	cat ${OCF_RESKEY_state}
	return $OCF_ERR_GENERIC
    fi
    return 7
}

stateful_validate() {
	exit $OCF_SUCCESS
}

: ${slave_score=5}
: ${master_score=10}

: ${OCF_RESKEY_CRM_meta_interval=0}
: ${OCF_RESKEY_CRM_meta_globally_unique:="false"}

if [ "x$OCF_RESKEY_state" = "x" ]; then
    if [ ${OCF_RESKEY_CRM_meta_globally_unique} = "false" ]; then
	state="${HA_VARRUN%%/}/Stateful-${OCF_RESOURCE_INSTANCE}.state"
	
	# Strip off the trailing clone marker
	OCF_RESKEY_state=`echo $state | sed s/:[0-9][0-9]*\.state/.state/`
    else 
	OCF_RESKEY_state="${HA_VARRUN%%/}/Stateful-${OCF_RESOURCE_INSTANCE}.state"
    fi
fi

dump_env

case $__OCF_ACTION in
meta-data)	meta_data;;
start)		stateful_start;;
promote)	stateful_promote;;
demote)		stateful_demote;;
notify)         ;; # dumping the environment is all we do
stop)		stateful_stop;;
monitor)	stateful_monitor;;
validate-all)	stateful_validate;;
usage|help)	stateful_usage $OCF_SUCCESS;;
*)		stateful_usage $OCF_ERR_UNIMPLEMENTED;;
esac

exit $?