#!/bin/sh
#
#
#   DnsUpdater OCF RA. Does nothing but wait a few seconds, can be
#   configured to fail occassionally.
#
# Copyright (c) 2004 SUSE LINUX AG, Lars Marowsky-Brée
#                    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.
#

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

: ${OCF_FUNCTIONS_DIR=${OCF_ROOT}/lib/heartbeat}
. ${OCF_FUNCTIONS_DIR}/ocf-shellfuncs
: ${OCF_FUEL_FUNCTIONS_DIR=${OCF_ROOT}/resource.d/fuel}
. ${OCF_FUEL_FUNCTIONS_DIR}/ocf-fuel-funcs

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

# Fill in some defaults if no values are specified

OCF_RESKEY_binary_default="openstack-dns-updater.py"
#OCF_RESKEY_config_default="/etc/aodh/aodh.conf"
#OCF_RESKEY_user_default="aodh"
OCF_RESKEY_pid_default="${HA_RSCTMP}/${__SCRIPT_NAME}/${__SCRIPT_NAME}.pid"

: ${HA_LOGTAG="ocf-dns-updater"}
: ${HA_LOGFACILITY="daemon"}
: ${OCF_RESKEY_binary=${OCF_RESKEY_binary_default}}
#: ${OCF_RESKEY_config=${OCF_RESKEY_config_default}}
#: ${OCF_RESKEY_user=${OCF_RESKEY_user_default}}
: ${OCF_RESKEY_pid=${OCF_RESKEY_pid_default}}

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

usage() {
    cat <<UEND
        usage: $0 (start|stop|status)

        $0 manages an OpenStack DnsUpdater Service process as an HA resource

        The 'start' operation starts the service.
        The 'stop' operation stops the service.
        The 'status' operation reports whether the service is running

UEND
}

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

<longdesc lang="en">
sample dnsupdater resource
</longdesc>
<shortdesc lang="en">Example stateless resource agent</shortdesc>
<parameters>
<parameter name="pid" unique="0" required="0">
<longdesc lang="en">
The pid file to use for this OpenStack Aodh Evaluator Service (aodh-evaluator) instance
</longdesc>
<shortdesc lang="en">OpenStack Aodh Evaluator Service (aodh-evaluator) pid file</shortdesc>
<content type="string" default="${OCF_RESKEY_pid_default}" />
</parameter>

</parameters>

<actions>
<action name="start" timeout="20" />
<action name="stop" timeout="20" />
<action name="status" timeout="20" />
</actions>
</resource-agent>
END
}

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

dnsupdater_validate() {
    local rc

    return ${OCF_SUCCESS}
}

dnsupdater_status() {
    local pid
    local rc

    # check and make PID file dir
    local PID_DIR="$( dirname ${OCF_RESKEY_pid} )"
    if [ ! -d "${PID_DIR}" ] ; then
        ocf_log debug "Create pid file dir: ${PID_DIR}"
        mkdir -p "${PID_DIR}"
        chmod 755 "${PID_DIR}"
    fi

    if [ ! -f $OCF_RESKEY_pid ]; then
        ocf_log info "DnsUpdater is not running"
        return $OCF_NOT_RUNNING
    else
        pid=`cat $OCF_RESKEY_pid`
    fi

    if [ -n "${pid}" ]; then
        ocf_run -warn kill -s 0 $pid
        rc=$?
    else
        ocf_log err "PID file ${OCF_RESKEY_pid} is empty!"
        return $OCF_ERR_GENERIC
    fi

    if [ $rc -eq 0 ]; then
        return $OCF_SUCCESS
    else
        ocf_log info "Old PID file found, but DnsUpdater not running"
        return $OCF_NOT_RUNNING
    fi
}

dnsupdater_monitor() {
    local rc
    local pid

    dnsupdater_status
    rc=$?

    # If status returned anything but success, return that immediately
    if [ $rc -ne $OCF_SUCCESS ]; then
        return $rc
    fi

    ocf_log debug "OpenStack DnsUpdater monitor succeeded"
    return $OCF_SUCCESS
}

dnsupdater_start() {
    dnsupdater_status
    rc=$?
    if [ $rc -eq $OCF_SUCCESS ]; then
        ocf_log info "OpenStack DnsUpdater is already running"
        return $OCF_SUCCESS
    fi

    /usr/bin/python /usr/lib/python2.7/dist-packages/os_dns_updater/openstack-dns-updater.py >> /dev/null 2>&1 & echo $! > $OCF_RESKEY_pid
    ocf_log debug "Create pid file: ${OCF_RESKEY_pid} with content $(cat ${OCF_RESKEY_pid})"
    # Spin waiting for the server to come up.
    while true; do
    dnsupdater_monitor
    rc=$?
    [ $rc -eq $OCF_SUCCESS ] && break
    if [ $rc -ne $OCF_NOT_RUNNING ]; then
        ocf_log err "OpenStack DnsUpdater start failed"
        exit $OCF_ERR_GENERIC
    fi
    sleep 1
    done

    ocf_log info "OpenStack DnsUpdater started"
    return $OCF_SUCCESS
}

dnsupdater_stop() {
    local rc
    local shutdown_timeout=15
    if [ -n "$OCF_RESKEY_CRM_meta_timeout" ]; then
        shutdown_timeout=$(( ($OCF_RESKEY_CRM_meta_timeout/1000) ))
    fi

    dnsupdater_status
    rc="${?}"
    if [ "${rc}" -eq "${OCF_NOT_RUNNING}" ]; then
        ocf_log info "OpenStack DnsUpdater (${OCF_RESKEY_binary}) already stopped"
        return "${OCF_SUCCESS}"
    fi

    proc_stop "${OCF_RESKEY_pid}" "${OCF_RESKEY_binary}" $shutdown_timeout
    return "${?}"
}

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

case "$1" in
  meta-data) meta_data
                exit $OCF_SUCCESS;;
  usage|help) usage
                exit $OCF_SUCCESS;;
esac

# Anything except meta-data and help must pass validation
dnsupdater_validate || exit $?

# What kind of method was invoked?
case "$1" in
  start) dnsupdater_start;;
  stop) dnsupdater_stop;;
  status) dnsupdater_status;;
  monitor) dnsupdater_monitor;;
  validate-all) ;;
  *) usage
        exit $OCF_ERR_UNIMPLEMENTED;;
esac