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#!/bin/sh
set -e
PRINT_FLAG=false
MYSQL_HOST="localhost"
COMPARE_TYPE="eq"
usage() {
printf "$0 [options] <query> <target>\n"
printf "\t-H <host>\tMysql host\n"
printf "\t-u <user>\tMysql user\n"
printf "\t-d <database>\tMysql database\n"
printf "\t-c <compare_typw>\teq, lt or gt, defaults to eq\n"
printf "\t-p\t\tPrint the current value for each check\n"
}
while getopts "H:u:d:c:p" opt; do
case ${opt} in
H )
MYSQL_HOST="$OPTARG"
;;
u )
MYSQL_USER="$OPTARG"
;;
d )
MYSQL_DATABASE="$OPTARG"
;;
c )
COMPARE_TYPE="$OPTARG"
;;
p )
PRINT_FLAG=true
;;
\? )
echo "Invalid option: $OPTARG" 1>&2
exit 1
;;
: )
echo "Option -$OPTARG requires an argument." 1>&2
exit 1
;;
esac
done
shift $((OPTIND -1))
if [ -z "$1" ]; then
echo "Error: <query> argument is missing." >&2
usage
exit 1
fi
QUERY="$1"
if [ -z "$2" ]; then
echo "Error: <target> argument is missing." >&2
usage
exit 1
fi
TARGET="$2"
if [ -z "$MYSQL_HOST" ]; then
echo "Error: -H <host> argument is missing." >&2
usage
exit 1
fi
if [ -z "$MYSQL_USER" ]; then
echo "Error: -u <user> argument is missing." >&2
usage
exit 1
fi
if [ -z "$MYSQL_DATABASE" ]; then
echo "Error: -d <database> argument is missing." >&2
usage
exit 1
fi
read -s -p "Enter password: " MYSQL_PASSWORD
echo
while true; do
RESULT=$(mysql -u"$MYSQL_USER" -p"$MYSQL_PASSWORD" -h"$MYSQL_HOST" "$MYSQL_DATABASE" -e "$QUERY" --batch --silent 2> /dev/null)
if [ "$PRINT_FLAG" = true ]; then
echo "[$(date)]: ${RESULT}"
fi
if [ "$COMPARE_TYPE" = "eq" ]; then
if [ "$RESULT" = "$TARGET" ]; then
if [ "$PRINT_FLAG" = true ]; then
echo "[$(date)]: Target reached $RESULT = $TARGET"
fi
break
fi
elif [ "$COMPARE_TYPE" = "lt" ]; then
if (( RESULT < TARGET )); then
if [ "$PRINT_FLAG" = true ]; then
echo "[$(date)]: Target reached $RESULT < $TARGET"
fi
break
fi
elif [ "$COMPARE_TYPE" = "gt" ]; then
if (( RESULT > TARGET )); then
if [ "$PRINT_FLAG" = true ]; then
echo "[$(date)]: Target reached $RESULT > $TARGET"
fi
break
fi
fi
sleep 10
done
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