admission

Documentation

Index

• Variables
• func GetAdmissionPluginConfigurationFor(pluginCfg apiserver.AdmissionPluginConfiguration) (io.Reader, error)
• func NewForbidden(a Attributes, internalError error) error
• func NewNotFound(a Attributes) error
• func Validate(plugin Interface) error
• type Attributes
  • func NewAttributesRecord(object runtime.Object, oldObject runtime.Object, kind schema.GroupVersionKind, ...) Attributes
• type ConfigProvider
  • func ReadAdmissionConfiguration(pluginNames []string, configFilePath string) (ConfigProvider, error)
• type Factory
• type Handler
  • func NewHandler(ops ...Operation) *Handler
  • func (h *Handler) Handles(operation Operation) bool
  • func (h *Handler) SetReadyFunc(readyFunc ReadyFunc)
  • func (h *Handler) WaitForReady() bool
• type Interface
  • func NewChainHandler(handlers ...Interface) Interface
• type Operation
• type PluginEnabledFunc
• type PluginInitializer
• type PluginInitializers
  • func (pp PluginInitializers) Initialize(plugin Interface)
• type Plugins
  • func (ps *Plugins) InitPlugin(name string, config io.Reader, pluginInitializer PluginInitializer) (Interface, error)
  • func (ps *Plugins) NewFromPlugins(pluginNames []string, configProvider ConfigProvider, ...) (Interface, error)
  • func (ps *Plugins) Register(name string, plugin Factory)
  • func (ps *Plugins) Registered() []string
• type ReadyFunc
• type Validator

Variables

var (
	// PluginEnabledFn checks whether a plugin is enabled.  By default, if you ask about it, it's enabled.
	PluginEnabledFn = func(name string, config io.Reader) bool {
		return true
	}
)

All registered admission options.

Functions

func GetAdmissionPluginConfigurationFor

func GetAdmissionPluginConfigurationFor(pluginCfg apiserver.AdmissionPluginConfiguration) (io.Reader, error)

GetAdmissionPluginConfigurationFor returns a reader that holds the admission plugin configuration.

func NewForbidden

func NewForbidden(a Attributes, internalError error) error

NewForbidden is a utility function to return a well-formatted admission control error response

func NewNotFound

func NewNotFound(a Attributes) error

NewNotFound is a utility function to return a well-formatted admission control error response

func Validate

func Validate(plugin Interface) error

Validate will call the Validate function in each plugin if they implement the Validator interface.

Types

type Attributes

type Attributes interface {
	// GetName returns the name of the object as presented in the request.  On a CREATE operation, the client
	// may omit name and rely on the server to generate the name.  If that is the case, this method will return
	// the empty string
	GetName() string
	// GetNamespace is the namespace associated with the request (if any)
	GetNamespace() string
	// GetResource is the name of the resource being requested.  This is not the kind.  For example: pods
	GetResource() schema.GroupVersionResource
	// GetSubresource is the name of the subresource being requested.  This is a different resource, scoped to the parent resource, but it may have a different kind.
	// For instance, /pods has the resource "pods" and the kind "Pod", while /pods/foo/status has the resource "pods", the sub resource "status", and the kind "Pod"
	// (because status operates on pods). The binding resource for a pod though may be /pods/foo/binding, which has resource "pods", subresource "binding", and kind "Binding".
	GetSubresource() string
	// GetOperation is the operation being performed
	GetOperation() Operation
	// GetObject is the object from the incoming request prior to default values being applied
	GetObject() runtime.Object
	// GetOldObject is the existing object. Only populated for UPDATE requests.
	GetOldObject() runtime.Object
	// GetKind is the type of object being manipulated.  For example: Pod
	GetKind() schema.GroupVersionKind
	// GetUserInfo is information about the requesting user
	GetUserInfo() user.Info
}

Attributes is an interface used by AdmissionController to get information about a request that is used to make an admission decision.

func NewAttributesRecord

func NewAttributesRecord(object runtime.Object, oldObject runtime.Object, kind schema.GroupVersionKind, namespace, name string, resource schema.GroupVersionResource, subresource string, operation Operation, userInfo user.Info) Attributes

type ConfigProvider

type ConfigProvider interface {
	ConfigFor(pluginName string) (io.Reader, error)
}

ConfigProvider provides a way to get configuration for an admission plugin based on its name

func ReadAdmissionConfiguration

func ReadAdmissionConfiguration(pluginNames []string, configFilePath string) (ConfigProvider, error)

ReadAdmissionConfiguration reads the admission configuration at the specified path. It returns the loaded admission configuration if the input file aligns with the required syntax. If it does not align with the provided syntax, it returns a default configuration for the enumerated set of pluginNames whose config location references the specified configFilePath. It does this to preserve backward compatibility when admission control files were opaque. It returns an error if the file did not exist.

type Factory

type Factory func(config io.Reader) (Interface, error)

Factory is a function that returns an Interface for admission decisions. The config parameter provides an io.Reader handler to the factory in order to load specific configurations. If no configuration is provided the parameter is nil.

type Handler

type Handler struct {
	// contains filtered or unexported fields
}

Handler is a base for admission control handlers that support a predefined set of operations

func NewHandler

func NewHandler(ops ...Operation) *Handler

NewHandler creates a new base handler that handles the passed in operations

func (*Handler) Handles

func (h *Handler) Handles(operation Operation) bool

Handles returns true for methods that this handler supports

func (*Handler) SetReadyFunc

func (h *Handler) SetReadyFunc(readyFunc ReadyFunc)

SetReadyFunc allows late registration of a ReadyFunc to know if the handler is ready to process requests.

func (*Handler) WaitForReady

func (h *Handler) WaitForReady() bool

WaitForReady will wait for the readyFunc (if registered) to return ready, and in case of timeout, will return false.

type Interface

type Interface interface {
	// Admit makes an admission decision based on the request attributes
	Admit(a Attributes) (err error)

	// Handles returns true if this admission controller can handle the given operation
	// where operation can be one of CREATE, UPDATE, DELETE, or CONNECT
	Handles(operation Operation) bool
}

Interface is an abstract, pluggable interface for Admission Control decisions.

func NewChainHandler

func NewChainHandler(handlers ...Interface) Interface

NewChainHandler creates a new chain handler from an array of handlers. Used for testing.

type Operation

type Operation string

Operation is the type of resource operation being checked for admission control

const (
	Create  Operation = "CREATE"
	Update  Operation = "UPDATE"
	Delete  Operation = "DELETE"
	Connect Operation = "CONNECT"
)

Operation constants

type PluginEnabledFunc

type PluginEnabledFunc func(name string, config io.Reader) bool

PluginEnabledFunc is a function type that can provide an external check on whether an admission plugin may be enabled

type PluginInitializer

type PluginInitializer interface {
	Initialize(plugin Interface)
}

PluginInitializer is used for initialization of shareable resources between admission plugins. After initialization the resources have to be set separately

type PluginInitializers

type PluginInitializers []PluginInitializer

func (PluginInitializers) Initialize

func (pp PluginInitializers) Initialize(plugin Interface)

type Plugins

type Plugins struct {
	// contains filtered or unexported fields
}

func (*Plugins) InitPlugin

func (ps *Plugins) InitPlugin(name string, config io.Reader, pluginInitializer PluginInitializer) (Interface, error)

InitPlugin creates an instance of the named interface.

func (*Plugins) NewFromPlugins

func (ps *Plugins) NewFromPlugins(pluginNames []string, configProvider ConfigProvider, pluginInitializer PluginInitializer) (Interface, error)

NewFromPlugins returns an admission.Interface that will enforce admission control decisions of all the given plugins.

func (*Plugins) Register

func (ps *Plugins) Register(name string, plugin Factory)

Register registers a plugin Factory by name. This is expected to happen during app startup.

func (*Plugins) Registered

func (ps *Plugins) Registered() []string

Registered enumerates the names of all registered plugins.

type ReadyFunc

type ReadyFunc func() bool

ReadyFunc is a function that returns true if the admission controller is ready to handle requests.

type Validator

type Validator interface {
	Validate() error
}

Validator holds Validate functions, which are responsible for validation of initialized shared resources and should be implemented on admission plugins