metrics: allow passing explicit port-num

Allow running exporter with explicit port-number. If input port-number
is non positive, use default port-number.

Signed-off-by: Shachar Sharon <[email protected]>

Author: synarete

cmd/main.go

@@ -48,7 +48,7 @@ func main() {
 	}
 	log.Info("Located smbstatus", "path", loc, "version", ver)
 
-	err = metrics.RunSmbMetricsExporter(log)
+	err = metrics.RunSmbMetricsExporter(log, metrics.DefaultMetricsPort)
 	if err != nil {
 		os.Exit(1)
 	}

internal/metrics/exporter.go

@@ -63,8 +63,11 @@ func (sme *smbMetricsExporter) serve() error {
 
 // RunSmbMetricsExporter executes an HTTP server and exports SMB metrics to
 // Prometheus.
-func RunSmbMetricsExporter(log logr.Logger) error {
-	sme := newSmbMetricsExporter(log, DefaultMetricsPort)
+func RunSmbMetricsExporter(log logr.Logger, port int) error {
+	if port <= 0 {
+		port = DefaultMetricsPort
+	}
+	sme := newSmbMetricsExporter(log, port)
 	err := sme.init()
 	if err != nil {
 		return err