Add an admin script to check if mumble's WebUI is currently in use.

active_web_users

@@ -0,0 +1,31 @@
+#! /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