Sensu plugin for checking yarn for running application

check-yarn.sh

#!/bin/bash
#
# Check yarn for running application
#
# ===
#
# Examples:
#
#   # check by application name
#   check-yarn.sh -a JobName
#
# Date: 2015-03-02
# Author: Jesse Rohland <jesse.rohland@gmail.com>
#
# Released under the same terms as Sensu (the MIT license); see LICENSE
# for details.

# get arguments
while getopts 'a:h' OPT; do
  case $OPT in
    a)  APPLICATION=$OPTARG;;
    h)  hlp="yes";;
    *)  unknown="yes";;
  esac
done

# usage
HELP="
    usage: $0 [ -a value -h ]

        -a --> application name
        -h --> print this help screen
"

if [ "$hlp" = "yes" ]; then
  echo "$HELP"
  exit 0
fi

if [ ${APPLICATION} ]; then
  ret=`yarn application -list -appStates RUNNING | grep "${APPLICATION}"`
  if [ ! "${ret}" ]; then
    echo "CRITICAL - application ${APPLICATION} does not exist"
    exit 2
  fi
  echo "APPLICATION OK - ${APPLICATION}"
  exit 0
fi

echo "$HELP"
exit 2