#!/bin/sh
#
# OpenStack Heat Engine OCF script
#
# Description:  Manages OpenStack Heat Engine process as a HA resource
#
# Authors:      Mirantis inc.
#
# 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_additional_parameters
#######################################################################
# Initialization:

: ${OCF_FUNCTIONS_DIR=${OCF_ROOT}/lib/heartbeat}
. ${OCF_FUNCTIONS_DIR}/ocf-shellfuncs

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

# Fill in some defaults if no values are specified

SERVICE_NAME="OpenStack Heat Engine"
LOG="/var/log/heat/heat-engine.log"

OCF_RESKEY_binary_default="/usr/bin/heat-engine"
OCF_RESKEY_config_default="/etc/heat/heat.conf"
OCF_RESKEY_pid_default="${HA_RSCTMP}/${__SCRIPT_NAME}/${__SCRIPT_NAME}.pid"
OCF_RESKEY_amqp_server_port_default="5673"
OCF_RESKEY_user_default="heat"

: ${HA_LOGTAG="ocf-heat_engine"}
: ${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}}

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

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

        $0 manages the ${SERVICE_NAME} process as an HA resource

        The 'start' operation starts the ${SERVICE_NAME}
        The 'stop' operation stops the ${SERVICE_NAME}
        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 ${SERVICE_NAME} is running
        The 'monitor' operation reports whether the ${SERVICE_NAME} is running

UEND
}

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

<longdesc lang="en">
Manages OpenStack Heat Engine daemon as a Pacemaker Resource.
Heat is used to deploy instances based on predefined templates.
There should be only one active instace of Heat Engine in an OpenStack cluster.
Heat Engine connects to its databse and uses AMQP service to communicate with
Heat API's processes ans REST interface to communicate with Nova API.
</longdesc>
<shortdesc lang="en">Manages OpenStack Heat</shortdesc>
<parameters>

<parameter name="binary" unique="0" required="0">
<longdesc lang="en">
Name of Heat's binary file that will be run.
</longdesc>
<shortdesc lang="en">Heat binary file</shortdesc>
<content type="string" default="${OCF_RESKEY_binary_default}" />
</parameter>

<parameter name="config" unique="0" required="0">
<longdesc lang="en">
Path to configuration file used by Heat Engine daemon
</longdesc>
<shortdesc lang="en">Heat configuration file</shortdesc>
<content type="string" default="${OCF_RESKEY_config_default}" />
</parameter>

<parameter name="user" unique="0" required="0">
<longdesc lang="en">
User running Heat Engine
</longdesc>
<shortdesc lang="en">Heat 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 process
</longdesc>
<shortdesc lang="en">Heat 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. Use for monitoring purposes
</longdesc>
<shortdesc lang="en">AMQP listening port</shortdesc>
<content type="integer" default="${OCF_RESKEY_amqp_server_port_default}" />
</parameter>

<parameter name="additional_parameters" unique="0" required="0">
<longdesc lang="en">
Additional parameters to pass on to the Heat engine if you do need them
</longdesc>
<shortdesc lang="en">Additional parameters for the Heat engine</shortdesc>
<content type="string" />
</parameter>

</parameters>

<actions>
<action name="start" timeout="20" />
<action name="stop" timeout="20" />
<action name="status" timeout="20" />
<action name="monitor" timeout="30" interval="20" />
<action name="validate-all" timeout="5" />
<action name="meta-data" timeout="5" />
</actions>
</resource-agent>
END
}

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

heat_engine_check_port() {
# This function has been taken from the squid RA and improved a bit
# The length of the integer must be 4
# Examples of valid port: "1080", "0080"
# Examples of invalid port: "1080bad", "0", "0000", ""

    local int
    local cnt

    int="$1"
    cnt=${#int}
    echo $int |egrep -qx '[0-9]+(:[0-9]+)?(,[0-9]+(:[0-9]+)?)*'

    if [ $? -ne 0 ] || [ $cnt -ne 4 ]; then
        ocf_log err "Invalid port number: $1"
        exit $OCF_ERR_CONFIGURED
    fi
}

service_validate() {
    local rc

    check_binary $OCF_RESKEY_binary
    check_binary netstat
    heat_engine_check_port $OCF_RESKEY_amqp_server_port

    # 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

    true
}

service_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 $OCF_RESKEY_pid ]; then
        ocf_log info "${SERVICE_NAME} 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 ${SERVICE_NAME} is not running"
        return $OCF_NOT_RUNNING
    fi
}

service_monitor() {
    local rc
    local pid
    local rc_amqp
    local engine_amqp_check

    service_status
    rc=$?

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

    ocf_log debug "OpenStack Orchestration Engine (heat-engine) monitor succeeded"
    return $OCF_SUCCESS
}

service_start() {
    local rc

    service_status
    rc=$?
    if [ $rc -eq $OCF_SUCCESS ]; then
        ocf_log info "${SERVICE_NAME} is already running"
        return $OCF_SUCCESS
    fi

    # source init and venv
    . /lib/lsb/init-functions
    # run the actual daemon.
    start-stop-daemon --start --background --quiet --chuid "${OCF_RESKEY_user}:${OCF_RESKEY_user}" --make-pidfile --pidfile "${OCF_RESKEY_pid}" --startas "${OCF_RESKEY_binary}"

    # Spin waiting for the server to come up.
    # Let the CRM/LRM time us out if required
    while true; do
    service_monitor
    rc=$?
    [ $rc -eq $OCF_SUCCESS ] && break
    if [ $rc -ne $OCF_NOT_RUNNING ]; then
        ocf_log err "${SERVICE_NAME} start failed"
        exit $OCF_ERR_GENERIC
    fi
    sleep 3
    done

    ocf_log info "${SERVICE_NAME} started"
    return $OCF_SUCCESS
}

service_stop() {
    local rc
    local pid

    service_status
    rc=$?
    if [ $rc -eq $OCF_NOT_RUNNING ]; then
        ocf_log info "${SERVICE_NAME} is already stopped"
        return $OCF_SUCCESS
    fi

    # Try SIGTERM
    pid=`cat $OCF_RESKEY_pid`
    ocf_run kill -s TERM $pid
    rc=$?
    if [ $rc -ne 0 ]; then
        ocf_log err "${SERVICE_NAME} couldn't be stopped"
        exit $OCF_ERR_GENERIC
    fi

    # stop waiting
    shutdown_timeout=15
    if [ -n "$OCF_RESKEY_CRM_meta_timeout" ]; then
        shutdown_timeout=$((($OCF_RESKEY_CRM_meta_timeout/1000)-5))
    fi
    count=0
    while [ $count -lt $shutdown_timeout ]; do
        service_status
        rc=$?
        if [ $rc -eq $OCF_NOT_RUNNING ]; then
            break
        fi
        count=`expr $count + 1`
        sleep 1
        ocf_log debug "${SERVICE_NAME} still hasn't stopped yet. Waiting ..."
    done

    service_status
    rc=$?
    if [ "${rc}" -ne "${OCF_NOT_RUNNING}" ]; then
        # SIGTERM didn't help either, try SIGKILL
        ocf_log info "${SERVICE_NAME} failed to stop after ${shutdown_timeout}s using SIGTERM. Trying SIGKILL ..."
        ocf_run kill -s KILL "${pid}"
    fi

    ocf_log info "${SERVICE_NAME} stopped"

    ocf_log debug "Delete pid file: ${OCF_RESKEY_pid} with content $(cat ${OCF_RESKEY_pid})"
    rm -f "${OCF_RESKEY_pid}"

    return "${OCF_SUCCESS}"
}

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

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
service_validate || exit $?

# What kind of method was invoked?
case "$1" in
  start)        service_start;;
  stop)         service_stop;;
  status)       service_status;;
  monitor)      service_monitor;;
  validate-all) ;;
  *)            usage
                exit $OCF_ERR_UNIMPLEMENTED;;
esac