#!/bin/sh
#
#
# OpenStack Key Manager Worker Service (barbican-worker)
#
# Description: Manages an OpenStack Key Manager Worker Service
# (barbican-worker) process as an HA resource
#
# Authors: Alex Kozyrev
#
# Support: openstack@lists.launchpad.net
# License: Apache Software License (ASL) 2.0
#
# Copyright (c) 2018 Wind River Systems, Inc.
#
# SPDX-License-Identifier: Apache-2.0
#
#
# See usage() function below for more details ...
#
# OCF instance parameters:
# OCF_RESKEY_binary
# OCF_RESKEY_user
# OCF_RESKEY_pid
#######################################################################
# Initialization:

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

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

# Fill in some defaults if no values are specified

OCF_RESKEY_binary_default="barbican-worker"
OCF_RESKEY_user_default="root"
OCF_RESKEY_pid_default="$HA_RSCTMP/$OCF_RESOURCE_INSTANCE.pid"

: ${OCF_RESKEY_binary=${OCF_RESKEY_binary_default}}
: ${OCF_RESKEY_user=${OCF_RESKEY_user_default}}
: ${OCF_RESKEY_pid=${OCF_RESKEY_pid_default}}

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

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

        $0 manages an OpenStack Key Manager Worker Service
        (barbican-worker) process as an HA resource

        The 'start' operation starts the scheduler service.
        The 'stop' operation stops the scheduler 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 scheduler service is running
        The 'monitor' operation reports whether the scheduler 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="barbican-worker">
<version>1.0</version>

<longdesc lang="en">
Resource agent for the OpenStack Key Manager Worker Service (barbican-worker)
May manage a barbican-worker instance or a clone set that
creates a distributed barbican-worker cluster.
</longdesc>
<shortdesc lang="en">Manages the OpenStack Key Manager Worker Service (barbican-worker)</shortdesc>
<parameters>

<parameter name="binary" unique="0" required="0">
<longdesc lang="en">
Location of the OpenStack Key Manager Worker server binary (barbican-worker)
</longdesc>
<shortdesc lang="en">OpenStack Key Manager Worker server binary (barbican-worker)</shortdesc>
<content type="string" default="${OCF_RESKEY_binary_default}" />
</parameter>

<parameter name="user" unique="0" required="0">
<longdesc lang="en">
User running OpenStack Key Manager Worker Service (barbican-worker)
</longdesc>
<shortdesc lang="en">OpenStack Key Manager Worker Service (barbican-worker) 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 Key Manager Worker Service (barbican-worker) instance
</longdesc>
<shortdesc lang="en">OpenStack Key Manager Worker Service (barbican-worker) 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" />
<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

barbican_worker_validate() {
    local rc

    check_binary $OCF_RESKEY_binary

    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
}

barbican_worker_status() {
    local pid
    local rc

    if [ ! -f $OCF_RESKEY_pid ]; then
        ocf_log info "OpenStack Key Manager Worker (barbican-worker) is not running"
        return $OCF_NOT_RUNNING
    else
        pid=`cat $OCF_RESKEY_pid`
    fi

    ocf_run -warn kill -s 0 $pid
    rc=$?
    if [ $rc -eq 0 ]; then
        return $OCF_SUCCESS
    else
        ocf_log info "Old PID file found, but OpenStack Key Manager Worker (barbican-worker) is not running"
        rm -f $OCF_RESKEY_pid
        return $OCF_NOT_RUNNING
    fi
}

barbican_worker_monitor() {
    local rc
    local pid

    barbican_worker_status
    rc=$?

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

    ocf_log debug "OpenStack Key Manager Worker (barbican-worker) monitor succeeded"
    return $OCF_SUCCESS
}

barbican_worker_start() {
    local rc

    barbican_worker_status
    rc=$?
    if [ $rc -eq $OCF_SUCCESS ]; then
        ocf_log info "OpenStack Key Manager Worker (barbican-worker) already running"
        return $OCF_SUCCESS
    fi

    # run the actual barbican-worker 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} \
    --logfile /var/log/barbican/barbican-worker.log"' >> /dev/null 2>&1 & echo $!' > $OCF_RESKEY_pid

    # Spin waiting for the server to come up.
    while true; do
    barbican_worker_monitor
    rc=$?
    [ $rc -eq $OCF_SUCCESS ] && break
    if [ $rc -ne $OCF_NOT_RUNNING ]; then
        ocf_log err "OpenStack Key Manager Worker (barbican-worker) start failed"
        exit $OCF_ERR_GENERIC
    fi
    sleep 1
    done

    ocf_log info "OpenStack Key Manager Worker (barbican-worker) started"
    return $OCF_SUCCESS
}

barbican_worker_confirm_stop() {
    local my_bin
    local my_processes

    my_binary=`which ${OCF_RESKEY_binary}`
    my_processes=`pgrep -l -f "^(python|/usr/bin/python|/usr/bin/python2) ${my_binary}([^\w-]|$)"`

    if [ -n "${my_processes}" ]
    then
        ocf_log info "About to SIGKILL the following: ${my_processes}"
        pkill -KILL -f "^(python|/usr/bin/python|/usr/bin/python2) ${my_binary}([^\w-]|$)"
    fi
}

barbican_worker_stop() {
    local rc
    local pid

    barbican_worker_status
    rc=$?
    if [ $rc -eq $OCF_NOT_RUNNING ]; then
        ocf_log info "OpenStack Key Manager Worker (barbican-worker) already stopped"
        barbican_worker_confirm_stop
        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 "OpenStack Key Manager Worker (barbican-worker) couldn't be stopped"
        barbican_worker_confirm_stop
        exit $OCF_ERR_GENERIC
    fi

    # stop waiting
    shutdown_timeout=2
    if [ -n "$OCF_RESKEY_CRM_meta_timeout" ]; then
        shutdown_timeout=$((($OCF_RESKEY_CRM_meta_timeout/1000)-5))
    fi
    count=0
    while [ $count -lt $shutdown_timeout ]; do
        barbican_worker_status
        rc=$?
        if [ $rc -eq $OCF_NOT_RUNNING ]; then
            break
        fi
        count=`expr $count + 1`
        sleep 1
        ocf_log debug "OpenStack Key Manager Worker (barbican-worker) still hasn't stopped yet. \
          Waiting ..."
    done

    barbican_worker_status
    rc=$?
    if [ $rc -ne $OCF_NOT_RUNNING ]; then
        # SIGTERM didn't help either, try SIGKILL
        ocf_log info "OpenStack Key Manager Worker (barbican-worker) failed to stop after \
          ${shutdown_timeout}s using SIGTERM. Trying SIGKILL ..."
        ocf_run kill -s KILL $pid
    fi
    barbican_worker_confirm_stop

    ocf_log info "OpenStack Key Manager Worker (barbican-worker) stopped"

    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
barbican_worker_validate || exit $?

# What kind of method was invoked?
case "$1" in
  start) barbican_worker_start;;
  stop) barbican_worker_stop;;
  status) barbican_worker_status;;
  monitor) barbican_worker_monitor;;
  validate-all) ;;
  *) usage
                exit $OCF_ERR_UNIMPLEMENTED;;
esac