Add account usage logic (#1567)

---------

Co-authored-by: Yury Gargay <yury.gargay@gmail.com>

management/server/activity/codes.go

@@ -1,12 +1,14 @@
 package activity
 
+import "maps"
+
 // Activity that triggered an Event
 type Activity int
 
 // Code is an activity string representation
 type Code struct {
-	message string
-	code    string
+	Message string
+	Code    string
 }
 
 const (
@@ -207,7 +209,7 @@ var activityMap = map[Activity]Code{
 // StringCode returns a string code of the activity
 func (a Activity) StringCode() string {
 	if code, ok := activityMap[a]; ok {
-		return code.code
+		return code.Code
 	}
 	return "UNKNOWN_ACTIVITY"
 }
@@ -215,7 +217,12 @@ func (a Activity) StringCode() string {
 // Message returns a string representation of an activity
 func (a Activity) Message() string {
 	if code, ok := activityMap[a]; ok {
-		return code.message
+		return code.Message
 	}
 	return "UNKNOWN_ACTIVITY"
 }
+
+// RegisterActivityMap adds new codes to the activity map
+func RegisterActivityMap(codes map[Activity]Code) {
+	maps.Copy(activityMap, codes)
+}

management/server/activity/event.go

@@ -8,12 +8,18 @@ const (
 	SystemInitiator = "sys"
 )
 
+// ActivityDescriber is an interface that describes an activity
+type ActivityDescriber interface {
+	StringCode() string
+	Message() string
+}
+
 // Event represents a network/system activity event.
 type Event struct {
 	// Timestamp of the event
 	Timestamp time.Time
 	// Activity that was performed during the event
-	Activity Activity
+	Activity ActivityDescriber
 	// ID of the event (can be empty, meaning that it wasn't yet generated)
 	ID uint64
 	// InitiatorID is the ID of an object that initiated the event (e.g., a user)