Add a new policy about resolving references for every reconcile loop

Signed-off-by: Sergen Yalçın <yalcinsergen97@gmail.com>

apis/common/v1/resource.go

@@ -85,19 +85,39 @@ const (
 	// When the ReferenceResolutionPolicy is set to ReferencePolicyOptional the
 	// execution could continue even if the reference cannot be resolved.
 	ReferencePolicyOptional ReferenceResolutionPolicy = "Optional"
+
+	// ReferencePolicyAlways is a resolution option.
+	// When the ReferenceResolutionPolicy is set to ReferencePolicyAlways the
+	// reference will be tried to resolve for every reconcile loop.
+	ReferencePolicyAlways ReferenceResolutionPolicy = "Always"
 )
 
 // A Reference to a named object.
 type Reference struct {
 	// Name of the referenced object.
 	Name string `json:"name"`
-	// Policy of the referenced object.
-	Policy ReferenceResolutionPolicy `json:"policy,omitempty"`
+	// Policies of the referenced object.
+	Policies []ReferenceResolutionPolicy `json:"policies,omitempty"`
 }
 
 // IsReferenceResolutionPolicyOptional checks whether the resolution policy of relevant reference is Optional.
 func (in *Reference) IsReferenceResolutionPolicyOptional() bool {
-	return in.Policy == ReferencePolicyOptional
+	for _, policy := range in.Policies {
+		if policy == ReferencePolicyOptional {
+			return true
+		}
+	}
+	return false
+}
+
+// IsReferenceResolutionPolicyAlways checks whether the resolution policy of relevant reference is Always.
+func (in *Reference) IsReferenceResolutionPolicyAlways() bool {
+	for _, policy := range in.Policies {
+		if policy == ReferencePolicyAlways {
+			return true
+		}
+	}
+	return false
 }
 
 // A TypedReference refers to an object by Name, Kind, and APIVersion. It is

apis/common/v1/zz_generated.deepcopy.go

@@ -248,7 +248,7 @@ func (in *ProviderConfigStatus) DeepCopy() *ProviderConfigStatus {
 // DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
 func (in *ProviderConfigUsage) DeepCopyInto(out *ProviderConfigUsage) {
 	*out = *in
-	out.ProviderConfigReference = in.ProviderConfigReference
+	in.ProviderConfigReference.DeepCopyInto(&out.ProviderConfigReference)
 	out.ResourceReference = in.ResourceReference
 }
 
@@ -273,7 +273,7 @@ func (in *PublishConnectionDetailsTo) DeepCopyInto(out *PublishConnectionDetails
 	if in.SecretStoreConfigRef != nil {
 		in, out := &in.SecretStoreConfigRef, &out.SecretStoreConfigRef
 		*out = new(Reference)
-		**out = **in
+		(*in).DeepCopyInto(*out)
 	}
 }
 
@@ -290,6 +290,11 @@ func (in *PublishConnectionDetailsTo) DeepCopy() *PublishConnectionDetailsTo {
 // DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
 func (in *Reference) DeepCopyInto(out *Reference) {
 	*out = *in
+	if in.Policies != nil {
+		in, out := &in.Policies, &out.Policies
+		*out = make([]ReferenceResolutionPolicy, len(*in))
+		copy(*out, *in)
+	}
 }
 
 // DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new Reference.
@@ -318,12 +323,12 @@ func (in *ResourceSpec) DeepCopyInto(out *ResourceSpec) {
 	if in.ProviderConfigReference != nil {
 		in, out := &in.ProviderConfigReference, &out.ProviderConfigReference
 		*out = new(Reference)
-		**out = **in
+		(*in).DeepCopyInto(*out)
 	}
 	if in.ProviderReference != nil {
 		in, out := &in.ProviderReference, &out.ProviderReference
 		*out = new(Reference)
-		**out = **in
+		(*in).DeepCopyInto(*out)
 	}
 }
 

pkg/reference/reference.go

@@ -113,10 +113,17 @@ type ResolutionRequest struct {
 // IsNoOp returns true if the supplied ResolutionRequest cannot or should not be
 // processed.
 func (rr ResolutionRequest) IsNoOp() bool {
-	// We don't resolve values that are already set; we effectively cache
-	// resolved values. The CR author can invalidate the cache and trigger a new
-	// resolution by explicitly clearing the resolved value.
-	if rr.CurrentValue != "" {
+	isAlways := false
+	if rr.Reference != nil {
+		if rr.Reference.IsReferenceResolutionPolicyAlways() {
+			isAlways = true
+		}
+	}
+	// We don't resolve values that are already set (if reference resolution policy
+	// is not set to Always); we effectively cache resolved values. The CR author
+	// can invalidate the cache and trigger a new resolution by explicitly clearing
+	// the resolved value.
+	if rr.CurrentValue != "" && !isAlways {
 		return true
 	}
 
@@ -154,12 +161,19 @@ type MultiResolutionRequest struct {
 // IsNoOp returns true if the supplied MultiResolutionRequest cannot or should
 // not be processed.
 func (rr MultiResolutionRequest) IsNoOp() bool {
-	// We don't resolve values that are already set; we effectively cache
-	// resolved values. The CR author can invalidate the cache and trigger a new
-	// resolution by explicitly clearing the resolved values. This is a little
-	// unintuitive for the APIMultiResolver but mimics the UX of the APIResolver
-	// and simplifies the overall mental model.
-	if len(rr.CurrentValues) > 0 {
+	isAlways := false
+	for _, r := range rr.References {
+		if r.IsReferenceResolutionPolicyAlways() {
+			isAlways = true
+			break
+		}
+	}
+	// We don't resolve values that are already set (if reference resolution policy
+	// is not set to Always); we effectively cache resolved values. The CR author
+	// can invalidate the cache and trigger a new resolution by explicitly clearing
+	// the resolved values. This is a little unintuitive for the APIMultiResolver
+	// but mimics the UX of the APIResolver and simplifies the overall mental model.
+	if len(rr.CurrentValues) > 0 && !isAlways {
 		return true
 	}
 

pkg/reference/reference_test.go

@@ -91,7 +91,8 @@ func TestResolve(t *testing.T) {
 	now := metav1.Now()
 	value := "coolv"
 	ref := &xpv1.Reference{Name: "cool"}
-	optionalRef := &xpv1.Reference{Name: "cool", Policy: xpv1.ReferencePolicyOptional}
+	optionalRef := &xpv1.Reference{Name: "cool", Policies: []xpv1.ReferenceResolutionPolicy{xpv1.ReferencePolicyOptional}}
+	alwaysRef := &xpv1.Reference{Name: "cool", Policies: []xpv1.ReferenceResolutionPolicy{xpv1.ReferencePolicyAlways}}
 
 	controlled := &fake.Managed{}
 	controlled.SetName(value)
@@ -135,6 +136,32 @@ func TestResolve(t *testing.T) {
 				err: nil,
 			},
 		},
+		"AlwaysResolve": {
+			reason: "Should not return early if the current value is non-zero, when the resolution policy is set to" +
+				"Always",
+			c: &test.MockClient{
+				MockGet: test.NewMockGetFn(nil, func(obj client.Object) error {
+					meta.SetExternalName(obj.(metav1.Object), value)
+					return nil
+				}),
+			},
+			from: &fake.Managed{},
+			args: args{
+				req: ResolutionRequest{
+					Reference:    alwaysRef,
+					To:           To{Managed: &fake.Managed{}},
+					Extract:      ExternalName(),
+					CurrentValue: "oldValue",
+				},
+			},
+			want: want{
+				rsp: ResolutionResponse{
+					ResolvedValue:     value,
+					ResolvedReference: alwaysRef,
+				},
+				err: nil,
+			},
+		},
 		"Unresolvable": {
 			reason: "Should return early if neither a reference or selector were provided",
 			from:   &fake.Managed{},
@@ -303,7 +330,8 @@ func TestResolveMultiple(t *testing.T) {
 	now := metav1.Now()
 	value := "coolv"
 	ref := xpv1.Reference{Name: "cool"}
-	optionalRef := xpv1.Reference{Name: "cool", Policy: xpv1.ReferencePolicyOptional}
+	optionalRef := xpv1.Reference{Name: "cool", Policies: []xpv1.ReferenceResolutionPolicy{xpv1.ReferencePolicyOptional}}
+	alwaysRef := xpv1.Reference{Name: "cool", Policies: []xpv1.ReferenceResolutionPolicy{xpv1.ReferencePolicyAlways}}
 
 	controlled := &fake.Managed{}
 	controlled.SetName(value)
@@ -347,6 +375,32 @@ func TestResolveMultiple(t *testing.T) {
 				err: nil,
 			},
 		},
+		"AlwaysResolve": {
+			reason: "Should not return early if the current value is non-zero, when the resolution policy is set to" +
+				"Always",
+			c: &test.MockClient{
+				MockGet: test.NewMockGetFn(nil, func(obj client.Object) error {
+					meta.SetExternalName(obj.(metav1.Object), value)
+					return nil
+				}),
+			},
+			from: &fake.Managed{},
+			args: args{
+				req: MultiResolutionRequest{
+					References:    []xpv1.Reference{alwaysRef},
+					To:            To{Managed: &fake.Managed{}},
+					Extract:       ExternalName(),
+					CurrentValues: []string{"oldValue"},
+				},
+			},
+			want: want{
+				rsp: MultiResolutionResponse{
+					ResolvedValues:     []string{value},
+					ResolvedReferences: []xpv1.Reference{alwaysRef},
+				},
+				err: nil,
+			},
+		},
 		"Unresolvable": {
 			reason: "Should return early if neither a reference or selector were provided",
 			from:   &fake.Managed{},

pkg/resource/providerconfig.go

@@ -20,6 +20,8 @@ import (
 	"context"
 	"os"
 
+	"github.com/google/go-cmp/cmp"
+
 	"github.com/spf13/afero"
 	corev1 "k8s.io/api/core/v1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
@@ -153,7 +155,7 @@ func (u *ProviderConfigUsageTracker) Track(ctx context.Context, mg Managed) erro
 	err := u.c.Apply(ctx, pcu,
 		MustBeControllableBy(mg.GetUID()),
 		AllowUpdateIf(func(current, _ runtime.Object) bool {
-			return current.(ProviderConfigUsage).GetProviderConfigReference() != pcu.GetProviderConfigReference()
+			return !cmp.Equal(current.(ProviderConfigUsage).GetProviderConfigReference(), pcu.GetProviderConfigReference())
 		}),
 	)
 	return errors.Wrap(Ignore(IsNotAllowed, err), errApplyPCU)