Remove excluded controllers early to safe memory

Rather than watching excluded controller (and just omiting them at save
time), just don't watch them, so we'll save memory (and cpu time too).

pkg/controllers/controllers.go

@@ -82,6 +82,21 @@ func Register(name string, ctrl ControllerConstructor) {
 	AllControllers[name] = ctrl
 }
 
+// FilterControllers removes excluded controllers
+func FilterControllers(excluded []string) map[string]ControllerConstructor {
+	filtered := make(map[string]ControllerConstructor)
+
+	for k, v := range AllControllers {
+		filtered[k] = v
+	}
+
+	for _, ctrl := range excluded {
+		delete(filtered, ctrl)
+	}
+
+	return filtered
+}
+
 // Start initialize and launch a controller. The sync.WaitGroup
 // argument is expected to be aknowledged (Done()) at controller
 // termination, when Stop() is called.

pkg/run/run.go

@@ -17,8 +17,10 @@ import (
 
 // Run launchs the effective controllers goroutines
 func Run(config *config.KdnConfig) {
+	ctrlers := controllers.FilterControllers(config.ExcludeKind)
+
 	wg := sync.WaitGroup{}
-	wg.Add(len(controllers.AllControllers))
+	wg.Add(len(ctrlers))
 	defer wg.Wait()
 
 	repos := git.New(config)
@@ -31,7 +33,7 @@ func Run(config *config.KdnConfig) {
 
 	var chans []chan controllers.Event
 
-	for _, c := range controllers.AllControllers {
+	for _, c := range ctrlers {
 		ch := make(chan controllers.Event, 100)
 		chans = append(chans, ch)
 		ctrl := c(config, ch)