Refacter code to use new ObjectType (#2121)

* Refacter code to use new ObjectType

Problem: We currently use the variable objType
to refer to a client.Object's type (skeleton of
an object). We also use the variable obj to refer
to a full client.Object (object with fields filled
out). However, in many parts of the codebase these
two variables are used closely together and are
both of type client.Object which can be a little
confusing.

Solution: I created a new type called ObjectType
and refactored the codebase to utilize it.

internal/framework/controller/reconciler.go

@@ -13,6 +13,7 @@ import (
 	"sigs.k8s.io/controller-runtime/pkg/reconcile"
 
 	"github.com/nginxinc/nginx-gateway-fabric/internal/framework/events"
+	ngftypes "github.com/nginxinc/nginx-gateway-fabric/internal/framework/types"
 )
 
 // NamespacedNameFilterFunc is a function that returns true if the resource should be processed by the reconciler.
@@ -24,7 +25,7 @@ type ReconcilerConfig struct {
 	// Getter gets a resource from the k8s API.
 	Getter Getter
 	// ObjectType is the type of the resource that the reconciler will reconcile.
-	ObjectType client.Object
+	ObjectType ngftypes.ObjectType
 	// EventCh is the channel where the reconciler will send events.
 	EventCh chan<- interface{}
 	// NamespacedNameFilter filters resources the controller will process. Can be nil.
@@ -52,7 +53,7 @@ func NewReconciler(cfg ReconcilerConfig) *Reconciler {
 	}
 }
 
-func (r *Reconciler) newObject(objectType client.Object) client.Object {
+func (r *Reconciler) newObject(objectType ngftypes.ObjectType) ngftypes.ObjectType {
 	if r.cfg.OnlyMetadata {
 		partialObj := &metav1.PartialObjectMetadata{}
 		partialObj.SetGroupVersionKind(objectType.GetObjectKind().GroupVersionKind())

internal/framework/controller/register.go

@@ -12,6 +12,7 @@ import (
 	"sigs.k8s.io/controller-runtime/pkg/predicate"
 
 	"github.com/nginxinc/nginx-gateway-fabric/internal/framework/controller/index"
+	ngftypes "github.com/nginxinc/nginx-gateway-fabric/internal/framework/types"
 )
 
 const (
@@ -82,7 +83,7 @@ func defaultConfig() config {
 // The registered controller will send events to the provided channel.
 func Register(
 	ctx context.Context,
-	objectType client.Object,
+	objectType ngftypes.ObjectType,
 	mgr manager.Manager,
 	eventCh chan<- interface{},
 	options ...Option,
@@ -137,7 +138,7 @@ func Register(
 func addIndex(
 	ctx context.Context,
 	indexer client.FieldIndexer,
-	objectType client.Object,
+	objectType ngftypes.ObjectType,
 	field string,
 	indexerFunc client.IndexerFunc,
 ) error {

internal/framework/controller/register_test.go

@@ -13,7 +13,6 @@ import (
 	"k8s.io/apimachinery/pkg/runtime/schema"
 	"k8s.io/apimachinery/pkg/types"
 	utilruntime "k8s.io/apimachinery/pkg/util/runtime"
-	"sigs.k8s.io/controller-runtime/pkg/client"
 	"sigs.k8s.io/controller-runtime/pkg/client/fake"
 	"sigs.k8s.io/controller-runtime/pkg/log/zap"
 	v1 "sigs.k8s.io/gateway-api/apis/v1"
@@ -24,6 +23,7 @@ import (
 	"github.com/nginxinc/nginx-gateway-fabric/internal/framework/controller/index"
 	"github.com/nginxinc/nginx-gateway-fabric/internal/framework/controller/predicate"
 	"github.com/nginxinc/nginx-gateway-fabric/internal/framework/kinds"
+	ngftypes "github.com/nginxinc/nginx-gateway-fabric/internal/framework/types"
 )
 
 func TestRegister(t *testing.T) {
@@ -62,7 +62,7 @@ func TestRegister(t *testing.T) {
 
 	tests := []struct {
 		fakes                   fakes
-		objectType              client.Object
+		objectType              ngftypes.ObjectType
 		expectedErr             error
 		msg                     string
 		expectedMgrAddCallCount int

internal/framework/events/event.go

@@ -3,6 +3,8 @@ package events
 import (
 	"k8s.io/apimachinery/pkg/types"
 	"sigs.k8s.io/controller-runtime/pkg/client"
+
+	ngftypes "github.com/nginxinc/nginx-gateway-fabric/internal/framework/types"
 )
 
 // EventBatch is a batch of events to be handled at once.
@@ -17,7 +19,7 @@ type UpsertEvent struct {
 // DeleteEvent representing deleting a resource.
 type DeleteEvent struct {
 	// Type is the resource type. For example, if the event is for *v1.HTTPRoute, pass &v1.HTTPRoute{} as Type.
-	Type client.Object
+	Type ngftypes.ObjectType
 	// NamespacedName is the namespace & name of the deleted resource.
 	NamespacedName types.NamespacedName
 }

internal/framework/status/updater.go

@@ -12,11 +12,12 @@ import (
 	"sigs.k8s.io/controller-runtime/pkg/client"
 
 	"github.com/nginxinc/nginx-gateway-fabric/internal/framework/controller"
+	ngftypes "github.com/nginxinc/nginx-gateway-fabric/internal/framework/types"
 )
 
 // UpdateRequest is a request to update the status of a resource.
 type UpdateRequest struct {
-	ResourceType client.Object
+	ResourceType ngftypes.ObjectType
 	Setter       Setter
 	NsName       types.NamespacedName
 }
@@ -83,7 +84,7 @@ func (u *Updater) Update(ctx context.Context, reqs ...UpdateRequest) {
 func (u *Updater) writeStatuses(
 	ctx context.Context,
 	nsname types.NamespacedName,
-	resourceType client.Object,
+	resourceType ngftypes.ObjectType,
 	statusSetter Setter,
 ) {
 	obj := resourceType.DeepCopyObject().(client.Object)

internal/framework/types/doc.go

@@ -0,0 +1,4 @@
+/*
+Package types contains types that are shared by the provisioner and static modes.
+*/
+package types

internal/framework/types/types.go

@@ -0,0 +1,7 @@
+package types
+
+import "sigs.k8s.io/controller-runtime/pkg/client"
+
+// ObjectType is used when we only care about the type of client.Object.
+// The fields of the client.Object may be empty.
+type ObjectType client.Object

internal/mode/provisioner/manager.go

@@ -21,6 +21,7 @@ import (
 	"github.com/nginxinc/nginx-gateway-fabric/internal/framework/events"
 	"github.com/nginxinc/nginx-gateway-fabric/internal/framework/gatewayclass"
 	"github.com/nginxinc/nginx-gateway-fabric/internal/framework/status"
+	ngftypes "github.com/nginxinc/nginx-gateway-fabric/internal/framework/types"
 )
 
 // Config is configuration for the provisioner mode.
@@ -63,7 +64,7 @@ func StartManager(cfg Config) error {
 	// Note: for any new object type or a change to the existing one,
 	// make sure to also update firstBatchPreparer creation below
 	controllerRegCfgs := []struct {
-		objectType client.Object
+		objectType ngftypes.ObjectType
 		options    []controller.Option
 	}{
 		{

internal/mode/static/manager.go

@@ -45,6 +45,7 @@ import (
 	"github.com/nginxinc/nginx-gateway-fabric/internal/framework/kinds"
 	"github.com/nginxinc/nginx-gateway-fabric/internal/framework/runnables"
 	"github.com/nginxinc/nginx-gateway-fabric/internal/framework/status"
+	ngftypes "github.com/nginxinc/nginx-gateway-fabric/internal/framework/types"
 	"github.com/nginxinc/nginx-gateway-fabric/internal/mode/static/config"
 	"github.com/nginxinc/nginx-gateway-fabric/internal/mode/static/metrics/collectors"
 	ngxcfg "github.com/nginxinc/nginx-gateway-fabric/internal/mode/static/nginx/config"
@@ -356,7 +357,7 @@ func registerControllers(
 	controlConfigNSName types.NamespacedName,
 ) error {
 	type ctlrCfg struct {
-		objectType client.Object
+		objectType ngftypes.ObjectType
 		options    []controller.Option
 	}
 

internal/mode/static/state/change_processor.go

@@ -18,6 +18,7 @@ import (
 	ngfAPI "github.com/nginxinc/nginx-gateway-fabric/apis/v1alpha1"
 	"github.com/nginxinc/nginx-gateway-fabric/internal/framework/gatewayclass"
 	"github.com/nginxinc/nginx-gateway-fabric/internal/framework/kinds"
+	ngftypes "github.com/nginxinc/nginx-gateway-fabric/internal/framework/types"
 	"github.com/nginxinc/nginx-gateway-fabric/internal/mode/static/policies"
 	"github.com/nginxinc/nginx-gateway-fabric/internal/mode/static/state/graph"
 	"github.com/nginxinc/nginx-gateway-fabric/internal/mode/static/state/validation"
@@ -50,7 +51,7 @@ type ChangeProcessor interface {
 	// CaptureDeleteChange captures a delete change to a resource.
 	// The method panics if the resource is of unsupported type or if the passed Gateway is different from the one
 	// this ChangeProcessor was created for.
-	CaptureDeleteChange(resourceType client.Object, nsname types.NamespacedName)
+	CaptureDeleteChange(resourceType ngftypes.ObjectType, nsname types.NamespacedName)
 	// Process produces a graph-like representation of GatewayAPI resources.
 	// If no changes were captured, the changed return argument will be NoChange and graph will be empty.
 	Process() (changeType ChangeType, graphCfg *graph.Graph)
@@ -114,11 +115,11 @@ func NewChangeProcessorImpl(cfg ChangeProcessorConfig) *ChangeProcessorImpl {
 		clusterState: clusterStore,
 	}
 
-	isReferenced := func(obj client.Object, nsname types.NamespacedName) bool {
+	isReferenced := func(obj ngftypes.ObjectType, nsname types.NamespacedName) bool {
 		return processor.latestGraph != nil && processor.latestGraph.IsReferenced(obj, nsname)
 	}
 
-	isNGFPolicyRelevant := func(obj client.Object, nsname types.NamespacedName) bool {
+	isNGFPolicyRelevant := func(obj ngftypes.ObjectType, nsname types.NamespacedName) bool {
 		pol, ok := obj.(policies.Policy)
 		if !ok {
 			return false
@@ -241,7 +242,7 @@ func (c *ChangeProcessorImpl) CaptureUpsertChange(obj client.Object) {
 	c.updater.Upsert(obj)
 }
 
-func (c *ChangeProcessorImpl) CaptureDeleteChange(resourceType client.Object, nsname types.NamespacedName) {
+func (c *ChangeProcessorImpl) CaptureDeleteChange(resourceType ngftypes.ObjectType, nsname types.NamespacedName) {
 	c.lock.Lock()
 	defer c.lock.Unlock()
 

internal/mode/static/state/change_processor_test.go

@@ -25,6 +25,7 @@ import (
 	"github.com/nginxinc/nginx-gateway-fabric/internal/framework/gatewayclass"
 	"github.com/nginxinc/nginx-gateway-fabric/internal/framework/helpers"
 	"github.com/nginxinc/nginx-gateway-fabric/internal/framework/kinds"
+	ngftypes "github.com/nginxinc/nginx-gateway-fabric/internal/framework/types"
 	"github.com/nginxinc/nginx-gateway-fabric/internal/mode/static/state"
 	staticConds "github.com/nginxinc/nginx-gateway-fabric/internal/mode/static/state/conditions"
 	"github.com/nginxinc/nginx-gateway-fabric/internal/mode/static/state/graph"
@@ -2328,7 +2329,7 @@ var _ = Describe("ChangeProcessor", func() {
 
 		DescribeTable(
 			"CaptureDeleteChange must panic",
-			func(resourceType client.Object, nsname types.NamespacedName) {
+			func(resourceType ngftypes.ObjectType, nsname types.NamespacedName) {
 				process := func() {
 					processor.CaptureDeleteChange(resourceType, nsname)
 				}

internal/mode/static/state/changed_predicate.go

@@ -3,20 +3,22 @@ package state
 import (
 	"k8s.io/apimachinery/pkg/types"
 	"sigs.k8s.io/controller-runtime/pkg/client"
+
+	ngftypes "github.com/nginxinc/nginx-gateway-fabric/internal/framework/types"
 )
 
 // stateChangedPredicate determines whether upsert and delete events constitute a change in state.
 type stateChangedPredicate interface {
 	// upsert returns true if the newObject changes state.
 	upsert(oldObject, newObject client.Object) bool
 	// delete returns true if the deletion of the object changes state.
-	delete(object client.Object, nsname types.NamespacedName) bool
+	delete(object ngftypes.ObjectType, nsname types.NamespacedName) bool
 }
 
 // funcPredicate applies the stateChanged function on upsert and delete. On upsert, the newObject is passed.
 // Implements stateChangedPredicate.
 type funcPredicate struct {
-	stateChanged func(object client.Object, nsname types.NamespacedName) bool
+	stateChanged func(object ngftypes.ObjectType, nsname types.NamespacedName) bool
 }
 
 func (f funcPredicate) upsert(_, newObject client.Object) bool {
@@ -27,7 +29,7 @@ func (f funcPredicate) upsert(_, newObject client.Object) bool {
 	return f.stateChanged(newObject, client.ObjectKeyFromObject(newObject))
 }
 
-func (f funcPredicate) delete(object client.Object, nsname types.NamespacedName) bool {
+func (f funcPredicate) delete(object ngftypes.ObjectType, nsname types.NamespacedName) bool {
 	return f.stateChanged(object, nsname)
 }
 
@@ -53,4 +55,6 @@ func (a annotationChangedPredicate) upsert(oldObject, newObject client.Object) b
 	return oldAnnotation != newAnnotation
 }
 
-func (a annotationChangedPredicate) delete(_ client.Object, _ types.NamespacedName) bool { return true }
+func (a annotationChangedPredicate) delete(_ ngftypes.ObjectType, _ types.NamespacedName) bool {
+	return true
+}

internal/mode/static/state/changed_predicate_test.go

@@ -8,10 +8,12 @@ import (
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/types"
 	"sigs.k8s.io/controller-runtime/pkg/client"
+
+	ngftypes "github.com/nginxinc/nginx-gateway-fabric/internal/framework/types"
 )
 
 func TestFuncPredicate(t *testing.T) {
-	alwaysTrueFunc := func(_ client.Object, _ types.NamespacedName) bool { return true }
+	alwaysTrueFunc := func(_ ngftypes.ObjectType, _ types.NamespacedName) bool { return true }
 	emptyObject := &v1.Pod{}
 
 	p := funcPredicate{stateChanged: alwaysTrueFunc}
@@ -23,7 +25,7 @@ func TestFuncPredicate(t *testing.T) {
 }
 
 func TestFuncPredicate_Panic(t *testing.T) {
-	alwaysTrueFunc := func(_ client.Object, _ types.NamespacedName) bool { return true }
+	alwaysTrueFunc := func(_ ngftypes.ObjectType, _ types.NamespacedName) bool { return true }
 
 	p := funcPredicate{stateChanged: alwaysTrueFunc}
 

internal/mode/static/state/graph/graph.go

@@ -15,6 +15,7 @@ import (
 	ngfAPI "github.com/nginxinc/nginx-gateway-fabric/apis/v1alpha1"
 	"github.com/nginxinc/nginx-gateway-fabric/internal/framework/controller/index"
 	"github.com/nginxinc/nginx-gateway-fabric/internal/framework/kinds"
+	ngftypes "github.com/nginxinc/nginx-gateway-fabric/internal/framework/types"
 	"github.com/nginxinc/nginx-gateway-fabric/internal/mode/static/policies"
 	"github.com/nginxinc/nginx-gateway-fabric/internal/mode/static/state/validation"
 )
@@ -79,7 +80,7 @@ type Graph struct {
 type ProtectedPorts map[int32]string
 
 // IsReferenced returns true if the Graph references the resource.
-func (g *Graph) IsReferenced(resourceType client.Object, nsname types.NamespacedName) bool {
+func (g *Graph) IsReferenced(resourceType ngftypes.ObjectType, nsname types.NamespacedName) bool {
 	switch obj := resourceType.(type) {
 	case *v1.Secret:
 		_, exists := g.ReferencedSecrets[nsname]