#!/bin/bash
#
#
# OpenStack Nova Compute (nova-compute)
#
# Description:  Manages an OpenStack Nova Compute (nova-compute) process as an HA resource
#
# Authors:      Sébastien Han
# Mainly inspired by the Glance API resource agent written by Martin Gerhard Loschwitz from Hastexo: http://goo.gl/whLpr
#
# Support:      openstack@lists.launchpad.net
# License:      Apache Software License (ASL) 2.0
#
#
# See usage() function below for more details ...
#
# OCF instance parameters:
#   OCF_RESKEY_binary
#   OCF_RESKEY_config
#   OCF_RESKEY_user
#   OCF_RESKEY_pid
#   OCF_RESKEY_amqp_server_port
#   OCF_RESKEY_zeromq
#   OCF_RESKEY_additional_parameters
#######################################################################
# 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
PATH=/bin:/sbin:/usr/bin:/usr/sbin

OCF_RESKEY_binary_default="nova-compute"
OCF_RESKEY_config_default="/etc/nova/nova.conf"
OCF_RESKEY_user_default="nova"
OCF_RESKEY_pid_default="${HA_RSCTMP}/${__SCRIPT_NAME}/${__SCRIPT_NAME}.pid"
OCF_RESKEY_amqp_server_port_default="5672"
OCF_RESKEY_zeromq_default="false"

: ${HA_LOGTAG="ocf-nova-compute"}
: ${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}}
: ${OCF_RESKEY_amqp_server_port=${OCF_RESKEY_amqp_server_port_default}}
: ${OCF_RESKEY_zeromq=${OCF_RESKEY_zeromq_default}}

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

usage() {
    cat <<UEND
        usage: $0 (start|stop|validate-all|meta-data|status|monitor)

        $0 manages an OpenStack Nova Compute (nova-compute) process as an HA resource

        The 'start' operation starts the nova-compute service.
        The 'stop' operation stops the nova-compute service.
        The 'validate-all' operation reports whether the parameters are valid
        The 'meta-data' operation reports this RA's meta-data information
        The 'status' operation reports whether the nova-compute service is running
        The 'monitor' operation reports whether the nova-compute service seems to be working

UEND
}

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

<longdesc lang="en">
Resource agent for the OpenStack Nova Compute Service (nova-compute)
May manage a nova-compute instance or a clone set that
creates a distributed nova-compute cluster.
</longdesc>
<shortdesc lang="en">Manages the OpenStack Nova Compute (nova-compute)</shortdesc>
<parameters>

<parameter name="binary" unique="0" required="0">
<longdesc lang="en">
Location of the OpenStack Nova Compute server binary (nova-compute)
</longdesc>
<shortdesc lang="en">OpenStack Nova Compute server binary (nova-compute)</shortdesc>
<content type="string" default="${OCF_RESKEY_binary_default}" />
</parameter>

<parameter name="config" unique="0" required="0">
<longdesc lang="en">
Location of the OpenStack Nova Compute (nova-compute) configuration file
</longdesc>
<shortdesc lang="en">OpenStack Nova Compute (nova-compute registry) config file</shortdesc>
<content type="string" default="${OCF_RESKEY_config_default}" />
</parameter>

<parameter name="user" unique="0" required="0">
<longdesc lang="en">
User running OpenStack Nova Compute (nova-compute)
</longdesc>
<shortdesc lang="en">OpenStack Nova Compute (nova-compute) user</shortdesc>
<content type="string" default="${OCF_RESKEY_user_default}" />
</parameter>

<parameter name="pid" unique="0" required="0">
<longdesc lang="en">
The pid file to use for this OpenStack Nova Compute (nova-compute) instance
</longdesc>
<shortdesc lang="en">OpenStack Nova Compute (nova-compute) pid file</shortdesc>
<content type="string" default="${OCF_RESKEY_pid_default}" />
</parameter>

<parameter name="amqp_server_port" unique="0" required="0">
<longdesc lang="en">
The listening port number of the AMQP server. Mandatory to perform a monitor check
</longdesc>
<shortdesc lang="en">AMQP listening port</shortdesc>
<content type="integer" default="${OCF_RESKEY_amqp_server_port_default}" />
</parameter>

<parameter name="zeromq" unique="0" required="0">
<longdesc lang="en">
If zeromq is used, this will disable the connection test to the AMQP server
</longdesc>
<shortdesc lang="en">Zero-MQ usage</shortdesc>
<content type="boolean" default="${OCF_RESKEY_zeromq_default}" />
</parameter>

<parameter name="additional_parameters" unique="0" required="0">
<longdesc lang="en">
Additional parameters to pass on to the OpenStack Nova Compute (nova-compute)
</longdesc>
<shortdesc lang="en">Additional parameters for nova-compute</shortdesc>
<content type="string" />
</parameter>

</parameters>

<actions>
<action name="start" timeout="10" />
<action name="stop" timeout="10" />
<action name="status" timeout="10" />
<action name="monitor" timeout="5" interval="10" />
<action name="validate-all" timeout="5" />
<action name="meta-data" timeout="5" />
</actions>
</resource-agent>
END
}

#######################################################################
# Functions invoked by resource manager actions

nova_compute_validate() {
    local rc

    check_binary $OCF_RESKEY_binary
    check_binary netstat

    if ! validate_port $OCF_RESKEY_amqp_server_port; then
      return ${OCF_ERR_CONFIGURED}
    fi

    # A config file on shared storage that is not available
    # during probes is OK.
    if [ ! -f $OCF_RESKEY_config ]; then
        if ! ocf_is_probe; then
            ocf_log err "Config $OCF_RESKEY_config doesn't exist"
            return $OCF_ERR_INSTALLED
        fi
        ocf_log_warn "Config $OCF_RESKEY_config not available during a probe"
    fi

    getent passwd $OCF_RESKEY_user >/dev/null 2>&1
    rc=$?
    if [ $rc -ne 0 ]; then
        ocf_log err "User $OCF_RESKEY_user doesn't exist"
        return $OCF_ERR_INSTALLED
    fi

    return ${OCF_SUCCESS}
}

nova_compute_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} and chown to ${OCF_RESKEY_user}"
        mkdir -p "${PID_DIR}"
        chown -R ${OCF_RESKEY_user} "${PID_DIR}"
        chmod 755 "${PID_DIR}"
    fi

    if [ ! -f $OCF_RESKEY_pid ]; then
        ocf_log info "OpenStack Nova Compute (nova-compute) 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 OpenStack Nova Compute (nova-compute) is not running"
        return $OCF_NOT_RUNNING
    fi
}

nova_compute_monitor() {
    local rc
    local pid
    local rc_amqp
    local console_amqp_check

    nova_compute_status
    rc=$?

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

    ocf_log debug "OpenStack Nova Compute (nova-compute) monitor succeeded"
    return $OCF_SUCCESS
}

nova_compute_start() {
    local rc

    nova_compute_status
    rc=$?
    if [ $rc -eq $OCF_SUCCESS ]; then
        ocf_log info "OpenStack Nova Compute (nova-compute) already running"
        return $OCF_SUCCESS
    fi

    # run the actual nova-compute daemon. Don't use ocf_run as we're sending the tool's output
    # straight to /dev/null anyway and using ocf_run would break stdout-redirection here.
    su ${OCF_RESKEY_user} -s /bin/sh -c "${OCF_RESKEY_binary} --config-file=${OCF_RESKEY_config} \
       $OCF_RESKEY_additional_parameters"' >> /dev/null 2>&1 & echo $!' > $OCF_RESKEY_pid

    ocf_log debug "Create pid file: ${OCF_RESKEY_pid} with content $(cat ${OCF_RESKEY_pid})"
    # Spin waiting for the server to come up.
    # Let the CRM/LRM time us out if required
    while true; do
        nova_compute_monitor
        rc=$?
        [ $rc -eq $OCF_SUCCESS ] && break
        if [ $rc -ne $OCF_NOT_RUNNING ]; then
            ocf_log err "OpenStack Nova Compute (nova-compute) start failed"
            exit $OCF_ERR_GENERIC
        fi
        sleep 3
    done

    ocf_log info "OpenStack Nova Compute (nova-compute) started"
    return $OCF_SUCCESS
}

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

    nova_compute_status
    rc=$?
    if [ "${rc}" -eq "${OCF_NOT_RUNNING}" ]; then
        ocf_log info "OpenStack Nova Compute (${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
nova_compute_validate || exit $?

# What kind of method was invoked?
case "$1" in
  start)        nova_compute_start;;
  stop)         nova_compute_stop;;
  status)       nova_compute_status;;
  monitor)      nova_compute_monitor;;
  validate-all) ;;
  *)            usage
                exit $OCF_ERR_UNIMPLEMENTED;;
esac