Lag Monitoring

#!/bin/bash

# set the following 3 variables to reasonable values; don't break your own shit
MY_STEAM_NAME=CHANGEME
MY_EXPECTED_PING=150
REPORT_LOCATION=~/deadlock-reports

# don't edit below

mkdir -p -- "${REPORT_LOCATION}"

while true; do
    REPORT_PATH="${REPORT_LOCATION}/mtr-${MY_STEAM_NAME}-$(date +%FT%R).txt"
    PING_RESULTS=$(ping -4 -c 3 -q play.deadlock.com | tail -n 2)
    PING_MS=$(echo ${PING_RESULTS} | awk -F ' ' '{print $(NF-1)}' | cut -d / -f 1 | cut -d . -f 1)
    PACKET_LOSS=$(echo ${PING_RESULTS} | grep "0% packet loss")
    if [ "${PING_MS/time/9999}" -gt "$((MY_EXPECTED_PING * 10 / 9))" -o -z "${PACKET_LOSS}" ]; then #high ping or packet loss
	TZ=UTC mtr -4 -b -w -c 300 play.deadlock.com | tee ${REPORT_PATH}
    else # things appear normal, don't hammer server
	echo -e "$(date):\tNo packet loss and ping(${PING_MS}) within range, sleeping..."
	sleep 30
    fi
done