Move common stats code to metrics package.

metrics/prometheus.go

@@ -0,0 +1,42 @@
+/**
+ * Standalone signaling server for the Nextcloud Spreed app.
+ * Copyright (C) 2025 struktur AG
+ *
+ * @author Joachim Bauch <bauch@struktur.de>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package metrics
+
+import (
+	"github.com/prometheus/client_golang/prometheus"
+)
+
+func RegisterAll(cs ...prometheus.Collector) {
+	for _, c := range cs {
+		if err := prometheus.DefaultRegisterer.Register(c); err != nil {
+			if _, ok := err.(prometheus.AlreadyRegisteredError); !ok {
+				panic(err)
+			}
+		}
+	}
+}
+
+func UnregisterAll(cs ...prometheus.Collector) {
+	for _, c := range cs {
+		prometheus.Unregister(c)
+	}
+}