#!/usr/bin/env ash

# ============LICENSE_START=======================================================
# ONAP
# ================================================================================
# Copyright (C) 2017-2020 AT&T Intellectual Property. All rights reserved.
# ================================================================================
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# ============LICENSE_END=========================================================

source ${POLICY_HOME}/etc/profile.d/env.sh

function usage() {
    echo -n "syntax: $(basename $0) "
    echo "[--debug]"
}

function log() {
    echo "$(date +"%Y-%m-%d_%H-%M-%S") $1" >> ${POLICY_HOME}/logs/monitor.log
}

function monitor() {
    if [ "$DEBUG" = "y" ]; then
        echo "-- monitor --"
        set -x
    fi
        
    CONTROLLER=$1
    STATUS=$2

    if [ -z "${CONTROLLER}" ]; then
        log "WARNING: invalid invocation: no component provided"
        return
    fi
    
    if [ -z "${STATUS}" ]; then
        log "WARNING: invalid invocation: no on/off/uninstalled switch provided for ${CONTROLLER}"
        return
    fi

    if [ "${STATUS}" = "off" ]; then
        off ${CONTROLLER}
    else
        if [ "${STATUS}" = "on" ]; then
            on ${CONTROLLER}
        fi
    fi
}

function on() {
    if [ "$DEBUG" = "y" ]; then
        echo "-- on --"
        set -x
    fi
        
    CONTROLLER=$1

    ${POLICY_HOME}/bin/${CONTROLLER} status
    if [ $? -ne 0 ]; then
        log "starting ${CONTROLLER}"

        # need to make sure we don't pass the lock file descriptor
        ${POLICY_HOME}/bin/${CONTROLLER} umstart 200>&-
    else        
        log "OK: ${CONTROLLER} (UP)"
    fi
}

function off() {
    if [ "$DEBUG" = "y" ]; then
        echo "-- off --"
        set -x
    fi
        
    CONTROLLER=$1

    ${POLICY_HOME}/bin/${CONTROLLER} status
    if [ $? -ne 0 ]; then
        log "OK: ${CONTROLLER} (DOWN)"

    else
        log "stopping ${CONTROLLER}"
        ${POLICY_HOME}/bin/${CONTROLLER} umstop
    fi
}

function process_config() {
    if [ "$DEBUG" = "y" ]; then
        echo "-- process_config --"
        set -x
    fi
    local lines=$(grep "^[^#;]" ${CON_FILE} 2> /dev/null)
    for line in ${lines} ; do
       controller=$(echo "${line}" | awk -F = '{print $1;}')
       status=$(echo "${line}" | awk -F = '{print $2;}')
       if [ -n "${controller}" ] && [ -n "${status}" ]; then
           monitor ${controller} ${status} 
       fi 
    done
    return 0
}

log "Enter monitor"

DEBUG=n
until [[ -z "$1" ]]; do
    case $1 in
        -d|--debug|debug)    DEBUG=y
                            set -x
                            ;;                                
        *)                    usage
                            exit 1
                            ;;
    esac
    shift
done

if pidof -o %PPID -x $(basename $0) > /dev/null 2>&1; then
    log "WARNING: $(basename $0) from the previous iteration still running.  Exiting."
    exit 1
fi

CONF_FILE=${POLICY_HOME}/etc/monitor/monitor.cfg
. ${POLICY_HOME}/etc/profile.d/env.sh

if flock 200 ; then
    process_config
fi 200>>${CONF_FILE}.lock