#! /bin/bash

# Parse mumble logs in order to determine if someone is currently accessing
# mumble through the WebUI. If not it means we can safely restart nginx
# on the reverse-proxy side without bothering anyone :)

MUMBLE_LOG=/var/log/mumble-server/mumble-server.log


main() {
    candidates=$(last_connections)
    for candidate in ${candidates}; do
        grep "<${candidate}:" "${MUMBLE_LOG}" | tail -n 1 | grep -q 'Connection closed'
        if [ $? -ne 0 ]; then
            echo "At least one person is currently using mumble's Web interface."
            grep "<${candidate}:" "${MUMBLE_LOG}" | tail -n 5
            exit 1
        fi
    done
    echo "It looks like nobody is currently using mumble's Web interface. You may restart nginx if you want ;)"
    exit 0
}

last_connections() {
    grep 'Client.*Node.js' "${MUMBLE_LOG}" \
        | tail -n 10 \
        | sed -r 's/^.*=> <([0-9]+):\(-1\)>.*$/\1/' \
        | tac
}

main