Random metrics generation for statsd

statsd-generator.sh

#!/bin/bash

BUCKETS=(ball sack nut job hax red saw new grunge)
TYPES=(g c s ms)

usage() {
    echo "Usage: -h [host] -p [port]"
    exit 1
}

rand() {
    printf $(($1 *  RANDOM  / 32767))
}

sample() {
    declare -a ary=("${!1}")
    unset ary[0]
    printf $'%s\n' "${ary[$(($(rand "${#ary[*]}")+1))]}"
}

emit() {
    local samples rate metric

    samples=('' "|@0.${RANDOM:0:2}" "")
    rate=$(sample samples[@])
    metric="$(sample BUCKETS[@]):$RANDOM|$(sample TYPES[@])$rate"

    echo $metric
    echo $metric | nc -u ${HOST-"127.0.0.1"} ${PORT-"5111"} -c
}

while getopts ":h:p" opt
do
    case $opt in
        h) HOST=$OPTARG;;
        p) PORT=$OPTARG;;
        *) usage;;
    esac
done

while true
do
    emit
    sleep 0.5
done