update pkg/resource templates for new Delta code

Adds plumbing to the `pkg/resource/depscriptor.go.tpl` template that
implements the `Delta()` method on the
`github.com/aws-controllers-k8s/runtime/pkg/types.AWSResourceDescriptor`
interface-implementing `resource` struct.

Author: jaypipes

templates/pkg/resource/delta.go.tpl

@@ -0,0 +1,23 @@
+{{ template "boilerplate" }}
+
+package {{ .CRD.Names.Snake }}
+
+import (
+	ackcompare "github.com/aws/aws-controllers-k8s/pkg/compare"
+)
+
+// newResourceDelta returns a new `ackcompare.Delta` used to compare two
+// resources
+func newResourceDelta(
+    a *resource,
+    b *resource,
+) *ackcompare.Delta {
+    delta := ackcompare.NewDelta()
+    if ((a == nil && b != nil) ||
+            (a != nil && b == nil)) {
+        delta.Add("", a, b)
+        return delta
+    }
+{{ GoCodeCompare .CRD "delta" "a.ko" "b.ko" 1}}
+    return delta
+}

templates/pkg/resource/descriptor.go.tpl

@@ -52,51 +52,10 @@ func (d *resourceDescriptor) ResourceFromRuntimeObject(
 	}
 }
 
-// Equal returns true if the two supplied AWSResources have the same content.
-// The underlying types of the two supplied AWSResources should be the same. In
-// other words, the Equal() method should be called with the same concrete
-// implementing AWSResource type
-func (d *resourceDescriptor) Equal(
-	a acktypes.AWSResource,
-	b acktypes.AWSResource,
-) bool {
-	ac := a.(*resource)
-	bc := b.(*resource)
-	opts := []cmp.Option{cmpopts.EquateEmpty()}
-	{{- if .CRD.CompareIgnoredFields }}
-	opts = append(opts, cmpopts.IgnoreFields(*ac.ko,
-		{{- range $fieldPath := .CRD.CompareIgnoredFields }}
-		{{ printf "%q" $fieldPath }},
-		{{- end }}
-	))
-	{{- end }}
-	return cmp.Equal(ac.ko, bc.ko, opts...)
-}
-
-// Diff returns a Reporter which provides the difference between two supplied
-// AWSResources. The underlying types of the two supplied AWSResources should
-// be the same. In other words, the Diff() method should be called with the
-// same concrete implementing AWSResource type
-func (d *resourceDescriptor) Diff(
-	a acktypes.AWSResource,
-	b acktypes.AWSResource,
-) *ackcompare.Reporter {
-	ac := a.(*resource)
-	bc := b.(*resource)
-	var diffReporter ackcompare.Reporter
-	opts := []cmp.Option{
-		cmp.Reporter(&diffReporter),
-		cmp.AllowUnexported(svcapitypes.{{ .CRD.Kind }}{}),
-	}
-	{{- if .CRD.CompareIgnoredFields }}
-	opts = append(opts, cmpopts.IgnoreFields(*ac.ko,
-		{{- range $fieldPath := .CRD.CompareIgnoredFields }}
-		{{ printf "%q" $fieldPath }},
-		{{- end }}
-	))
-	{{- end }}
-	cmp.Equal(ac.ko, bc.ko, opts...)
-	return &diffReporter
+// Delta returns an `ackcompare.Delta` object containing the difference between
+// one `AWSResource` and another.
+func (d *resourceDescriptor) Delta(a, b acktypes.AWSResource) *ackcompare.Delta {
+    return newResourceDelta(a, b)
 }
 
 // UpdateCRStatus accepts an AWSResource object and changes the Status

templates/pkg/resource/resource.go.tpl

@@ -11,7 +11,7 @@ import (
 	svcapitypes "github.com/aws-controllers-k8s/{{ .ServiceIDClean }}-controller/apis/{{ .APIVersion}}"
 )
 
-// resource implements the `aws-service-operator-k8s/pkg/types.AWSResource`
+// resource implements the `aws-controller-k8s/runtime/pkg/types.AWSResource`
 // interface
 type resource struct {
 	// The Kubernetes-native CR representing the resource

templates/pkg/resource/sdk_update.go.tpl

@@ -3,11 +3,11 @@ func (rm *resourceManager) sdkUpdate(
 	ctx context.Context,
 	desired *resource,
 	latest *resource,
-	diffReporter *ackcompare.Reporter,
+	delta *ackcompare.Delta,
 ) (*resource, error) {
 {{ $customMethod := .CRD.GetCustomImplementation .CRD.Ops.Update }}
 {{ if $customMethod }}
-	customResp, customRespErr := rm.{{ $customMethod }}(ctx, desired, latest, diffReporter)
+	customResp, customRespErr := rm.{{ $customMethod }}(ctx, desired, latest, delta)
 	if customResp != nil || customRespErr != nil {
 		return customResp, customRespErr
 	}