add support for int pointer references

Signed-off-by: Evan Johnson <eljohn1014@gmail.com>

pkg/reference/reference.go

@@ -60,6 +60,14 @@ func FromFloatPtrValue(v *float64) string {
 	return strconv.FormatFloat(*v, 'f', 0, 64)
 }
 
+// FromIntPtrValue adapts an int pointer field for use as a CurrentValue.
+func FromIntPtrValue(v *int64) string {
+	if v == nil {
+		return ""
+	}
+	return strconv.FormatInt(*v, 10)
+}
+
 // ToPtrValue adapts a ResolvedValue for use as a string pointer field.
 func ToPtrValue(v string) *string {
 	if v == "" {
@@ -80,6 +88,18 @@ func ToFloatPtrValue(v string) *float64 {
 	return &vParsed
 }
 
+// ToIntPtrValue adapts a ResolvedValue for use as an int pointer field.
+func ToIntPtrValue(v string) *int64 {
+	if v == "" {
+		return nil
+	}
+	vParsed, err := strconv.ParseInt(v, 10, 64)
+	if err != nil {
+		return nil
+	}
+	return &vParsed
+}
+
 // FromPtrValues adapts a slice of string pointer fields for use as CurrentValues.
 // NOTE: Do not use this utility function unless you have to.
 // Using pointer slices does not adhere to our current API practices.
@@ -102,6 +122,15 @@ func FromFloatPtrValues(v []*float64) []string {
 	return res
 }
 
+// FromIntPtrValues adapts a slice of int64 pointer fields for use as CurrentValues.
+func FromIntPtrValues(v []*int64) []string {
+	var res = make([]string, len(v))
+	for i := 0; i < len(v); i++ {
+		res[i] = FromIntPtrValue(v[i])
+	}
+	return res
+}
+
 // ToPtrValues adapts ResolvedValues for use as a slice of string pointer fields.
 // NOTE: Do not use this utility function unless you have to.
 // Using pointer slices does not adhere to our current API practices.
@@ -124,6 +153,15 @@ func ToFloatPtrValues(v []string) []*float64 {
 	return res
 }
 
+// ToIntPtrValues adapts ResolvedValues for use as a slice of int64 pointer fields.
+func ToIntPtrValues(v []string) []*int64 {
+	var res = make([]*int64, len(v))
+	for i := 0; i < len(v); i++ {
+		res[i] = ToIntPtrValue(v[i])
+	}
+	return res
+}
+
 // To indicates the kind of managed resource a reference is to.
 type To struct {
 	Managed resource.Managed

pkg/reference/reference_test.go

@@ -125,6 +125,26 @@ func TestToAndFromFloatPtrValues(t *testing.T) {
 	}
 }
 
+func TestToAndFromIntPtrValues(t *testing.T) {
+	cases := map[string]struct {
+		want []string
+	}{
+		"Nil":      {want: []string{}},
+		"Zero":     {want: []string{""}},
+		"NonZero":  {want: []string{"1123581321"}},
+		"Multiple": {want: []string{"1123581321", "1234567890"}},
+	}
+	for name, tc := range cases {
+		t.Run(name, func(t *testing.T) {
+			got := FromIntPtrValues(ToIntPtrValues(tc.want))
+			if diff := cmp.Diff(tc.want, got); diff != "" {
+				t.Errorf("FromIntPtrValues(ToIntPtrValues(%s): -want, +got: %s", tc.want, diff)
+
+			}
+		})
+	}
+}
+
 func TestResolve(t *testing.T) {
 	errBoom := errors.New("boom")
 	now := metav1.Now()