Exporting functions to allow users to have more control on where they…

… set the middleware and run engine

middleware.go

@@ -175,7 +175,8 @@ func (p *Prometheus) SetListenAddressWithRouter(listenAddress string, r *gin.Eng
 	}
 }
 
-func (p *Prometheus) setMetricsPath(e *gin.Engine) {
+// SetMetricsPath set metrics paths
+func (p *Prometheus) SetMetricsPath(e *gin.Engine) {
 
 	if p.listenAddress != "" {
 		p.router.GET(p.MetricsPath, prometheusHandler())
@@ -185,7 +186,8 @@ func (p *Prometheus) setMetricsPath(e *gin.Engine) {
 	}
 }
 
-func (p *Prometheus) setMetricsPathWithAuth(e *gin.Engine, accounts gin.Accounts) {
+// SetMetricsPathWithAuth set metrics paths with authentication
+func (p *Prometheus) SetMetricsPathWithAuth(e *gin.Engine, accounts gin.Accounts) {
 
 	if p.listenAddress != "" {
 		p.router.GET(p.MetricsPath, gin.BasicAuth(accounts), prometheusHandler())
@@ -338,17 +340,18 @@ func (p *Prometheus) registerMetrics(subsystem string) {
 
 // Use adds the middleware to a gin engine.
 func (p *Prometheus) Use(e *gin.Engine) {
-	e.Use(p.handlerFunc())
-	p.setMetricsPath(e)
+	e.Use(p.HandlerFunc())
+	p.SetMetricsPath(e)
 }
 
 // UseWithAuth adds the middleware to a gin engine with BasicAuth.
 func (p *Prometheus) UseWithAuth(e *gin.Engine, accounts gin.Accounts) {
-	e.Use(p.handlerFunc())
-	p.setMetricsPathWithAuth(e, accounts)
+	e.Use(p.HandlerFunc())
+	p.SetMetricsPathWithAuth(e, accounts)
 }
 
-func (p *Prometheus) handlerFunc() gin.HandlerFunc {
+// HandlerFunc defines handler function for middleware
+func (p *Prometheus) HandlerFunc() gin.HandlerFunc {
 	return func(c *gin.Context) {
 		if c.Request.URL.String() == p.MetricsPath {
 			c.Next()