#!/bin/sh
#
#   ldirectord OCF RA. Wrapper around @sbindir@/ldirectord to
#   be OCF RA compliant and therefore to get the possibility
#   to monitor ldirectord by HAv2.
#   Tested on SuSE Linux Enterprise Server 10.
#
#   Should conform to the specification found at
#    https://github.com/ClusterLabs/resource-agents/blob/master/doc/dev-guides/ra-dev-guide.asc
#   and
#    https://github.com/ClusterLabs/OCF-spec/blob/master/ra/resource-agent-api.md
#
#   ToDo: Add parameter to start several instances of ldirectord
#   with different config files.
#
# Copyright (c) 2007 Andreas Mock (andreas.mock@web.de)
#                    All Rights Reserved.
#
# 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.
#
#######################################################################
#
#	OCF Parameters
#	OCF_RESKEY_configfile
#	OCF_RESKEY_ldirectord
#
#######################################################################
# Initialization:

HA_VARRUNDIR=${HA_VARRUN}

. ${OCF_ROOT}/lib/heartbeat/ocf-shellfuncs

LDIRCONF=${OCF_RESKEY_configfile:-@sysconfdir@/ha.d/ldirectord.cf}
LDIRECTORD=${OCF_RESKEY_ldirectord:-@sbindir@/ldirectord}

meta_data() {
        cat <<END
<?xml version="1.0"?>
<!DOCTYPE resource-agent SYSTEM "ra-api-1.dtd">
<resource-agent name="ldirectord" version="0.9">
<version>1.0</version>

<longdesc lang="en">
It's a simple OCF RA wrapper for ldirectord and uses the ldirectord interface
to create the OCF compliant interface. You win monitoring of ldirectord.
Be warned: Asking ldirectord status is an expensive action.
</longdesc>
<shortdesc lang="en">Wrapper OCF Resource Agent for ldirectord</shortdesc>

<parameters>

<parameter name="configfile" unique="1">
<longdesc lang="en">
The full pathname of the ldirectord configuration file.
</longdesc>
<shortdesc lang="en">configuration file path</shortdesc>
<content type="string" default="@sysconfdir@/ha.d/ldirectord.cf" />
</parameter>

<parameter name="ldirectord">
<longdesc lang="en">
The full pathname of the ldirectord.
</longdesc>
<shortdesc lang="en">ldirectord binary path</shortdesc>
<content type="string" default="@sbindir@/ldirectord" />
</parameter>

</parameters>

<actions>
<action name="start"   timeout="15" />
<action name="stop"    timeout="15" />
<action name="monitor" depth="0"  timeout="10" interval="20" />
<action name="meta-data"  timeout="10" />
<action name="validate-all"  timeout="10" />
</actions>
</resource-agent>
END
}

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

ldir_init() {
    # check the supplied parameters exist enough that we can do all the other
    # operations
    if [ ! -f $LDIRCONF ]; then
        ocf_log warn "$LDIRCONF not found, ldirectord not installed"
        exit $OCF_ERR_INSTALLED
    fi

    if [ ! -x $LDIRECTORD ]; then
        ocf_log warn "$LDIRECTORD not found, ldirectord not installed"
        exit $OCF_ERR_INSTALLED
    fi
}

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

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

ldirectord_exit() {
    exit $1
}

ldirectord_start() {
    ldirectord_status
    RET=$?

    # if ldirectord is running or there's an error, pass on this return code
    if [ $RET -ne $OCF_NOT_RUNNING ]; then
        return $RET
    fi

    ocf_log info "Starting ldirectord"
    echo $LDIRECTORD $LDIRCONF start
    $LDIRECTORD $LDIRCONF start
    RET=$?
    if [ $RET -ne 0 ]; then
        return $OCF_ERR_GENERIC
    fi

    # call status again to make sure we're running properly
    ldirectord_status
}

ldirectord_stop() {
    # a status check is simple enough to see if ldirectord is running or not.
    # It will also error out if there's configuration parsing errors so we
    # can try kill ldirectord even if the config is broken.
    ldirectord_status
    RET=$?

    # ldirectord may be running, hard to tell when status returns an error
    if [ $RET -eq $OCF_ERR_GENERIC ]; then
        # get the PID of the right ldirectord process
        PID=`pgrep -f "$LDIRECTORD $LDIRCONF start" 2>&1`
        RET=$?
        
        if [ $RET -eq 0 ]; then
            ocf_log warn "Killing ldirectord($PID) with SIGTERM"
            kill $PID
        fi

        pgrep -f "$LDIRECTORD $LDIRCONF start" >/dev/null 2>&1
        RET=$?
        # if ldirectord is not running any more, we've (kind of) successfully
        # stopped it
        if [ $RET -eq 1 ]; then
            return $OCF_SUCCESS
        else
            # ldirectord is still running? Kill it badly
            ocf_log warn "Killing ldirectord($PID) with SIGKILL"
            kill -9 $PID

            pgrep -f "$LDIRECTORD $LDIRCONF start" >/dev/null 2>&1
            RET=$?
            # if it's not dead after here, we can't really do anything more
            if [ $RET -eq 1 ]; then
                return $OCF_SUCCESS
            fi
        fi

        # if none of our kills work, return an error. This should force the
        # resource unmanaged
        # on this node, requiring manual intervention.
        return $OCF_ERR_GENERIC
    else
        ocf_log info "Stopping ldirectord"
        # if ldirectord status is not an error, issue a stop. Multiple stops
        # will return 0
        $LDIRECTORD $LDIRCONF stop
        RET=$?
        case $RET in
            0) return $RET;;
            *) return 1;;
        esac
    fi
}

# simple check to see if ldirectord is running, returns the proper OCF codes.
ldirectord_status() {
    OUTPUT=`$LDIRECTORD $LDIRCONF status 2>&1`
    case $? in
        0) return $OCF_SUCCESS;;
        1) expr match "$OUTPUT" '.*ldirectord stale pid file.*' >/dev/null
           if [ $? -eq 0 ]; then
               return $OCF_NOT_RUNNING
           else
              return $OCF_ERR_GENERIC
           fi;;
        2) ocf_log err "$LDIRCONF has configuration errors"
           echo $OUTPUT
           return $OCF_ERR_GENERIC;;
        3) return $OCF_NOT_RUNNING;;
        *) echo $OUTPUT
           return $OCF_ERR_GENERIC;;
    esac
}

ldirectord_monitor() {
    # check if the process is running first
    ldirectord_status
    RET=$?

    if [ $RET -ne $OCF_SUCCESS ]; then
        return $RET
    fi

    # do more advanced checks here for high OCF_CHECK_LEVELs. Don't know what
    # more we can do at this time,
    # a status call already hits LVS in the kernel.
}

ldirectord_validate() {
    #ldir_init is already called, there's nothing more we can validate unless
    #we add more attributes
    return 0
}

case $1 in
	meta-data|usage|help) : ;;
	*) ldir_init $@ ;;
esac

case $__OCF_ACTION in
meta-data)      meta_data
                exit $OCF_SUCCESS
                ;;
start)  ldirectord_start
                ldirectord_exit $?
                ;;
stop)   ldirectord_stop
                ldirectord_exit $?
                ;;
monitor)    ldirectord_monitor
                ldirectord_exit $?
                ;;
validate-all)   ldirectord_validate
                ldirectord_exit $?
                ;;
usage|help)     ldirectord_usage
                exit $OCF_SUCCESS
                ;;
*)              ldirectord_usage
                exit $OCF_ERR_UNIMPLEMENTED
                ;;
esac