sensors: modify unload hooks and remove GetConfig and SetConfig

pkg/sensors/load.go

@@ -122,9 +122,9 @@ func (s *Sensor) Unload() error {
 		return fmt.Errorf("unload of sensor %s failed: sensor not loaded", s.Name)
 	}
 
-	if s.UnloadHook != nil {
-		if err := s.UnloadHook(); err != nil {
-			logger.GetLogger().Warnf("Sensor %s unload hook failed: %s", s.Name, err)
+	if s.PreUnloadHook != nil {
+		if err := s.PreUnloadHook(); err != nil {
+			logger.GetLogger().Warnf("Sensor %s pre unload hook failed: %s", s.Name, err)
 		}
 	}
 
@@ -139,6 +139,13 @@ func (s *Sensor) Unload() error {
 	}
 
 	s.Loaded = false
+
+	if s.PostUnloadHook != nil {
+		if err := s.PostUnloadHook(); err != nil {
+			logger.GetLogger().Warnf("Sensor %s post unload hook failed: %s", s.Name, err)
+		}
+	}
+
 	return nil
 }
 

pkg/sensors/sensors.go

@@ -48,10 +48,14 @@ type Sensor struct {
 	Loaded bool
 	// Ops contains an implementation to perform on this sensor.
 	Ops Operations
-	// UnloadHook can optionally contain a pointer to a function to be
+	// PreUnloadHook can optionally contain a pointer to a function to be
 	// called during sensor unloading, prior to the programs and maps being
 	// unloaded.
-	UnloadHook SensorUnloadHook
+	PreUnloadHook SensorUnloadHook
+	// PostUnloadHook can optionally contain a pointer to a function to be
+	// called during sensor unloading, after the programs and maps being
+	// unloaded.
+	PostUnloadHook SensorUnloadHook
 }
 
 // Operations is the interface to the underlying sensor implementations.