feature: add methods to get annotations

pkg/utils/kube/kube.go

@@ -135,6 +135,24 @@ func GetAppInstanceLabel(un *unstructured.Unstructured, key string) string {
 	return ""
 }
 
+// GetAppInstanceAnnotation returns the application instance name from annotations
+func GetAppInstanceAnnotation(un *unstructured.Unstructured, key string) string {
+	if annotations := un.GetAnnotations(); annotations != nil {
+		return annotations[key]
+	}
+
+	return ""
+}
+
+// GetAppInstanceIdentifier returns the application instance name from annotations else labels
+func GetAppInstanceIdentifier(un *unstructured.Unstructured, key string) string {
+	annotation := GetAppInstanceAnnotation(un, key)
+	if annotation != "" {
+		return annotation
+	}
+	return GetAppInstanceLabel(un, key)
+}
+
 // UnsetLabel removes our app labels from an unstructured object
 func UnsetLabel(target *unstructured.Unstructured, key string) {
 	if labels := target.GetLabels(); labels != nil {

pkg/utils/kube/kube_test.go

@@ -20,6 +20,8 @@ metadata:
   name: nginx-deployment
   labels:
     foo: bar
+  annotations:
+    foo: bar-annotations
 spec:
   template:
     metadata:
@@ -155,3 +157,36 @@ func TestSplitYAML_TrailingNewLines(t *testing.T) {
 	require.NoError(t, err)
 	assert.Len(t, objs, 1)
 }
+
+func TestGetLabels(t *testing.T) {
+	for _, yamlStr := range [][]byte{[]byte(depWithLabel)} {
+		var obj unstructured.Unstructured
+		err := yaml.Unmarshal(yamlStr, &obj)
+		require.NoError(t, err)
+
+		value := GetAppInstanceLabel(&obj, "foo")
+		assert.Equal(t, "bar", value)
+	}
+}
+
+func TestGetAnnotations(t *testing.T) {
+	for _, yamlStr := range [][]byte{[]byte(depWithLabel)} {
+		var obj unstructured.Unstructured
+		err := yaml.Unmarshal(yamlStr, &obj)
+		require.NoError(t, err)
+
+		value := GetAppInstanceAnnotation(&obj, "foo")
+		assert.Equal(t, "bar-annotations", value)
+	}
+}
+
+func TestGetIdentifier(t *testing.T) {
+	for _, yamlStr := range [][]byte{[]byte(depWithLabel)} {
+		var obj unstructured.Unstructured
+		err := yaml.Unmarshal(yamlStr, &obj)
+		require.NoError(t, err)
+
+		value := GetAppInstanceIdentifier(&obj, "foo")
+		assert.Equal(t, "bar-annotations", value)
+	}
+}