watchdog

#!/bin/bash

servername=$1
discordWebhookUrl="https://discord.com/api/webhooks/"
serverDir="~/$servername"
lockfile="watchdog.lock"
skipfile="watchdog.skip"

echo "$(date) - Checking $servername"

cd $serverDir

# lockfile is used to disable the watchdog
if [ -f $lockfile ]; then
    echo "$(date) - $servername is locked (watchdog disabled)"
    exit 0
fi

# skipfile is used to prevent the watchdog from restarting the server too often
# the skipfile contains a counter, which is decremented each time the watchdog runs until the file is empty or the counter is 0 (in which case the file is deleted)
if [ -f $skipfile ]; then
    echo "$(date) - $servername is marked for skipping"
    skipfile_content=$(cat $skipfile)
    if [ -z "$skipfile_content" ]; then
        rm $skipfile
        exit 0
    fi

    if [ "$skipfile_content" -eq 0 ]; then
        rm $skipfile
    else
        new_skipfile_content=$((skipfile_content - 1))
        echo "$new_skipfile_content" > $skipfile
    fi
    exit 0
fi

# check if server is running
if ! screen -list | grep -q $servername; then
    echo "$(date) - $servername is not running"
    curl -H "Content-Type: application/json" -X POST -d "{\"username\":\"Server Watchdog ($servername)\", \"content\":\"server is not running, restarting\"}" $discordWebhookUrl &
    bash start &
    # give server time to start
    touch $skipfile #skip 1 check (1 Minute)
else
    echo "$(date) - $servername is already running"
    # check if server is responsive. use rcon to check playercount
    if ! /srv/cst/$servername/rcon -c "list" | grep -q "players online"; then
        echo "$(date) - $servername is unresponsive, killing process"
        curl -H "Content-Type: application/json" -X POST -d "{\"username\":\"Server Watchdog ($servername)\", \"content\":\"server is unresponsive, killing hanging server.\"}" $discordWebhookUrl &
        # get pid:
        pid=$(screen -list | grep $servername | awk -F'.' '{print $1}')
        kill -9 $pid
        touch $skipfile #skip 1 check (1 Minute)
        sleep 5
        screen -wipe
    fi
fi