Bash script to continuously speedtest ISP connectivity, saves graphs to Librato Metrics

speedtest.bash

#!/usr/bin/env bash

######################################################################### CONFIG #

isp="VirginMedia"
run_every=1800 # in seconds
run_every_human="$(($run_every / 60)) minutes"

ovh="http://proof.ovh.net/files/10Mio.dat"
leaseweb="http://mirror.leaseweb.net/speedtest/10mb.bin"
thinkbroadband="http://ipv4.download.thinkbroadband.com/10MB.zip"

metrics_user=""
metrics_key=""
metrics_api="https://metrics-api.librato.com/v1/metrics"

######################################################################## UTILITY #

speedtest() {
  local _destination="$2"

  wget "$1" -O /dev/null 2>&1 | gawk -F"[( )]" -v user="$metrics_user" -v key="$metrics_key" -v api="$metrics_api" -v destination="$_destination" -v isp="$isp" '
  !/%/ { print }
  /[0-9]+0%/  {
    if (index($0, "100%") || (! index(done, $9))) {
      done = done " " $9
      print
    }
  }
  /MB\/s/ { speedtest_result = $4 }
  /KB\/s/ { speedtest_result = sprintf("%.2f", $4 * 0.0009765625) }

  END {
    record_metric = "curl -u "user":"key" -d \"gauges[0][name]="isp"\" -d \"source="destination"\" -d \"gauges[0][value]="speedtest_result"\" -X POST "api
    #print record_metric
    system(record_metric)
    close(record_metric)
  }
  '
}

while true
do
  speedtest "$ovh" OVH
  speedtest "$leaseweb" Leaseweb
  speedtest "$thinkbroadband" ThinkBroadband
  printf "%s\n" "Next run in $run_every_human"
  printf "%75s\n" | tr " " "-"
  sleep "$run_every"
done