96 lines
2.3 KiB
Bash
Executable File
96 lines
2.3 KiB
Bash
Executable File
#!/bin/sh
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# If exists tmux session
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# If Responds to queries
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SERVER_DIR='/home/ubuntu/minecraft'
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TMUX_NAME='minecraft server'
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LIVE_UNTIL="/home/ubuntu/minecraft/live_until.txt"
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json_has() {
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cat - | python3 -c "import sys, json; sys.exit(0 if '$1' in json.load(sys.stdin) else 1)"
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}
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json_parse() {
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cat - | python3 -c "import sys, json; print(json.load(sys.stdin)['$1'])"
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}
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silent_exitcode() {
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$* > /dev/null 2>&1
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}
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extend_ttl() {
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# Extend time to live 30 minutes at a time
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new_ttl="$(date -d '+30 min' +%s)"
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old_ttl="$(date -d "$(cat "$LIVE_UNTIL")" +%s)"
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if [ ! -f "$LIVE_UNTIL" ] || [ "$new_ttl" -ge "$old_ttl" ]; then
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# If LIVE_UNTIL file not existing or new time to live longer
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echo "Extending time to live until $(date -d "@$new_ttl")"
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date -d "@$new_ttl" > "$LIVE_UNTIL"
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fi
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exit 0
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}
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soft_poweroff() {
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# Poweroff, if time to live has expired
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ttl="0"
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if [ -f "$LIVE_UNTIL" ]; then
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ttl="$(date -d "$(cat "$LIVE_UNTIL")" +%s)"
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fi
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echo "Time to live is $(cat "$LIVE_UNTIL")"
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if [ "$(date +%s)" -ge "$ttl" ]; then
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echo "Server empty longer than grace time, shutting down"
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tmux send-keys -t "$TMUX_NAME.0" "stop" ENTER
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sleep 5
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$(sudo /sbin/shutdown -P +1)
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fi
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exit 1
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}
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tmux_running() {
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tmux ls -F "#{session_name}" | grep -q "$TMUX_NAME"
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}
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server_responsive() {
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silent_exitcode /usr/local/bin/mcstatus localhost ping
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}
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get_nplayers() {
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json="$(/usr/local/bin/mcstatus localhost json)"
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if `echo $json | json_has player_count`; then
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echo $json | json_parse player_count
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return
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fi
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status="$(/usr/local/bin/mcstatus localhost status)"
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echo "$status" | grep players: | sed 's/.*\([0-9]\+\)\/.*/\1/g'
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}
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n_logins="$(w -h | wc -l)"
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echo "$(date) [$n_logins logins]"
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if [ "$n_logins" -gt 0 ]; then
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echo "Keep alive as there are active ssh sessions"
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extend_ttl
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fi
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if tmux_running; then
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: #echo "Tmux running"
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else
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echo "Tmux not running"
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soft_poweroff
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fi
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if server_responsive; then
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n_players=$(get_nplayers)
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echo "Server responsive. $n_players players online"
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if [ "$n_players" -gt 0 ]; then
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# Keep alive as players are online
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extend_ttl
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else
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soft_poweroff
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fi
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else
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echo "Server unresponsive"
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soft_poweroff
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fi
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