Added Router Status which allows to track router status

network/router/router.go

@@ -26,6 +26,8 @@ type Router interface {
 	Advertise() (<-chan *Update, error)
 	// Update updates the routing table
 	Update(*Update) error
+	// Status returns router status
+	Status() Status
 	// Stop stops the router
 	Stop() error
 	// String returns debug info
@@ -34,7 +36,7 @@ type Router interface {
 
 // Update is sent by the router to the network
 type Update struct {
-	// ID is the source router ID
+	// ID is the router ID
 	ID string
 	// Timestamp marks the time when update is sent
 	Timestamp time.Time
@@ -42,6 +44,40 @@ type Update struct {
 	Event *Event
 }
 
+// StatusCode defines router status
+type StatusCode int
+
+// Status is router status
+type Status struct {
+	// Error is router error
+	Error error
+	// Code defines router status
+	Code StatusCode
+}
+
+const (
+	// Running means the rotuer is running
+	Running StatusCode = iota
+	// Error means the router has crashed with error
+	Error
+	// Stopped means the router has stopped
+	Stopped
+)
+
+// String returns human readable status code
+func (sc StatusCode) String() string {
+	switch sc {
+	case Running:
+		return "RUNNING"
+	case Error:
+		return "ERROR"
+	case Stopped:
+		return "STOPPED"
+	default:
+		return "UNKNOWN"
+	}
+}
+
 // Option used by the router
 type Option func(*Options)