support https configuration

docs/reference-config.yaml

@@ -168,7 +168,11 @@ minion:
 exporter:
   # Namespace is the prefix for all exported Prometheus metrics
   namespace: "kminion"
-  # Host that shall be used to bind the HTTP server on
+  # Host that shall be used to bind the HTTP(S) server on
   host: ""
-  # Port that shall be used to bind the HTTP server on
+  # Port that shall be used to bind the HTTP(S) server on
   port: 8080
+  # Certificate file to be used if configuring as a HTTPS server, leave empty to configure as a HTTP server
+  tlsCertificate: ""
+  # Key file to be used if configuring as a HTTPS server, ignored if tlsCertificate isnt set
+  tlsKey: ""

main.go

@@ -116,14 +116,21 @@ func main() {
 	go func() {
 		<-ctx.Done()
 		if err := srv.Shutdown(context.Background()); err != nil {
-			logger.Error("error stopping HTTP server", zap.Error(err))
+			logger.Error("error stopping server", zap.Error(err))
 			os.Exit(1)
 		}
 	}()
 	logger.Info("listening on address", zap.String("listen_address", address))
-	if err := srv.ListenAndServe(); err != nil && !errors.Is(err, http.ErrServerClosed) {
-		logger.Error("error starting HTTP server", zap.Error(err))
-		os.Exit(1)
+	if cfg.Exporter.TLSCertFile != "" {
+		if err := srv.ListenAndServeTLS(cfg.Exporter.TLSCertFile, cfg.Exporter.TLSKeyFile); err != nil && !errors.Is(err, http.ErrServerClosed) {
+			logger.Error("error starting HTTPS server", zap.Error(err))
+			os.Exit(1)
+		}
+	} else {
+		if err := srv.ListenAndServe(); err != nil && !errors.Is(err, http.ErrServerClosed) {
+			logger.Error("error starting HTTP server", zap.Error(err))
+			os.Exit(1)
+		}
 	}
 
 	logger.Info("kminion stopped")

prometheus/config.go

@@ -1,9 +1,11 @@
 package prometheus
 
 type Config struct {
-	Host      string `koanf:"host"`
-	Port      int    `koanf:"port"`
-	Namespace string `koanf:"namespace"`
+	Host        string `koanf:"host"`
+	Port        int    `koanf:"port"`
+	Namespace   string `koanf:"namespace"`
+	TLSCertFile string `koanf:"tlsCertificate"`
+	TLSKeyFile  string `koanf:"tlsKey"`
 }
 
 func (c *Config) SetDefaults() {