func evalValueFrom()

in src/app/backend/resource/pod/detail.go [360:408]
49 lines of code
16 McCabe index (conditional complexity)

func evalValueFrom(src *v1.EnvVarSource, container *v1.Container, pod *v1.Pod,
	configMaps *v1.ConfigMapList, secrets *v1.SecretList) string {
	switch {
	case src.ConfigMapKeyRef != nil:
		name := src.ConfigMapKeyRef.LocalObjectReference.Name
		for _, configMap := range configMaps.Items {
			if configMap.ObjectMeta.Name == name {
				return configMap.Data[src.ConfigMapKeyRef.Key]
			}
		}
	case src.SecretKeyRef != nil:
		name := src.SecretKeyRef.LocalObjectReference.Name
		for _, secret := range secrets.Items {
			if secret.ObjectMeta.Name == name {
				return base64.StdEncoding.EncodeToString([]byte(
					secret.Data[src.SecretKeyRef.Key]))
			}
		}
	case src.ResourceFieldRef != nil:
		valueFrom, err := extractContainerResourceValue(src.ResourceFieldRef, container)
		if err != nil {
			valueFrom = ""
		}
		resource := src.ResourceFieldRef.Resource
		if valueFrom == "0" && (resource == "limits.cpu" || resource == "limits.memory") {
			valueFrom = "node allocatable"
		}
		return valueFrom
	case src.FieldRef != nil:
		gv, err := schema.ParseGroupVersion(src.FieldRef.APIVersion)
		if err != nil {
			log.Println(err)
			return ""
		}
		gvk := gv.WithKind("Pod")
		internalFieldPath, _, err := runtime.NewScheme().ConvertFieldLabel(gvk, src.FieldRef.FieldPath, "")
		if err != nil {
			log.Println(err)
			return ""
		}
		valueFrom, err := ExtractFieldPathAsString(pod, internalFieldPath)
		if err != nil {
			log.Println(err)
			return ""
		}
		return valueFrom
	}
	return ""
}