hash

Documentation

Index

• Constants
• func GetTemplateHashLabel(labels map[string]string) string
• func Hash(obj interface{}) (string, error)
• func HashObject(object interface{}) string
• func SetTemplateHashLabel(labels map[string]string, template interface{}) map[string]string

Constants

const (
	// TemplateHashLabelName is a label to annotate a Kubernetes resource
	// with the hash of its initial template before creation.
	TemplateHashLabelName = "cstor.openebs.io/template-hash"
)

Functions

func GetTemplateHashLabel

func GetTemplateHashLabel(labels map[string]string) string

GetTemplateHashLabel returns the template hash label value if set, or an empty string.

func Hash

func Hash(obj interface{}) (string, error)

Hash constructs the hash value for any type of object

func HashObject

func HashObject(object interface{}) string

HashObject writes the specified object to a hash using the spew library which follows pointers and prints actual values of the nested objects ensuring the hash does not change when a pointer changes. The returned hash can be used for object comparisons.

This is inspired by controller revisions in StatefulSets: https://github.com/kubernetes/kubernetes/blob/8de1569ddae62e8fab559fe6bd210a5d6100a277/pkg/controller/history/controller_history.go#L89-L101

func SetTemplateHashLabel

func SetTemplateHashLabel(labels map[string]string, template interface{}) map[string]string

SetTemplateHashLabel adds a label containing the hash of the given template into the given labels. This label can then be used for template or resource comparisons.