meta

package
Version: v1.5.2 Latest Latest
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Published: Feb 25, 2021 License: Apache-2.0, Apache-2.0 Imports: 12 Imported by: 0

Documentation

Overview

Package meta provides functions for retrieving API metadata from objects belonging to the Kubernetes API

TODO: move everything in this file to pkg/api/rest

Index

Constants

View Source
const (
	AnyGroup    = "*"
	AnyVersion  = "*"
	AnyResource = "*"
	AnyKind     = "*"
)

Variables

View Source
var RESTScopeNamespace = &restScope{
	name:             RESTScopeNameNamespace,
	paramName:        "namespaces",
	argumentName:     "namespace",
	paramDescription: "object name and auth scope, such as for teams and projects",
}
View Source
var RESTScopeRoot = &restScope{
	name: RESTScopeNameRoot,
}

Functions

func ExtractList

func ExtractList(obj runtime.Object) ([]runtime.Object, error)

ExtractList returns obj's Items element as an array of runtime.Objects. Returns an error if obj is not a List type (does not have an Items member).

func GetItemsPtr

func GetItemsPtr(list runtime.Object) (interface{}, error)

GetItemsPtr returns a pointer to the list object's Items member. If 'list' doesn't have an Items member, it's not really a list type and an error will be returned. This function will either return a pointer to a slice, or an error, but not both.

func IsAmbiguousError

func IsAmbiguousError(err error) bool

func IsListType

func IsListType(obj runtime.Object) bool

IsListType returns true if the provided Object has a slice called Items

func IsNoMatchError

func IsNoMatchError(err error) bool

func KindToResource

KindToResource converts Kind to a resource name. Broken. This method only "sort of" works when used outside of this package. It assumes that Kinds and Resources match and they aren't guaranteed to do so.

func SetList

func SetList(list runtime.Object, objects []runtime.Object) error

SetList sets the given list object's Items member have the elements given in objects. Returns an error if list is not a List type (does not have an Items member), or if any of the objects are not of the right type.

Types

type AmbiguousKindError

type AmbiguousKindError struct {
	PartialKind unversioned.GroupVersionKind

	MatchingResources []unversioned.GroupVersionResource
	MatchingKinds     []unversioned.GroupVersionKind
}

AmbiguousKindError is returned if the RESTMapper finds multiple matches for a kind

func (*AmbiguousKindError) Error

func (e *AmbiguousKindError) Error() string

type AmbiguousResourceError

type AmbiguousResourceError struct {
	PartialResource unversioned.GroupVersionResource

	MatchingResources []unversioned.GroupVersionResource
	MatchingKinds     []unversioned.GroupVersionKind
}

AmbiguousResourceError is returned if the RESTMapper finds multiple matches for a resource

func (*AmbiguousResourceError) Error

func (e *AmbiguousResourceError) Error() string

type DefaultRESTMapper

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

DefaultRESTMapper exposes mappings between the types defined in a runtime.Scheme. It assumes that all types defined the provided scheme can be mapped with the provided MetadataAccessor and Codec interfaces.

The resource name of a Kind is defined as the lowercase, English-plural version of the Kind string. When converting from resource to Kind, the singular version of the resource name is also accepted for convenience.

TODO: Only accept plural for some operations for increased control? (`get pod bar` vs `get pods bar`)

func NewDefaultRESTMapper

func NewDefaultRESTMapper(defaultGroupVersions []unversioned.GroupVersion, f VersionInterfacesFunc) *DefaultRESTMapper

NewDefaultRESTMapper initializes a mapping between Kind and APIVersion to a resource name and back based on the objects in a runtime.Scheme and the Kubernetes API conventions. Takes a group name, a priority list of the versions to search when an object has no default version (set empty to return an error), and a function that retrieves the correct metadata for a given version.

func (*DefaultRESTMapper) Add

func (*DefaultRESTMapper) AddResourceAlias

func (m *DefaultRESTMapper) AddResourceAlias(alias string, resources ...string)

AddResourceAlias maps aliases to resources

func (*DefaultRESTMapper) AliasesForResource

func (m *DefaultRESTMapper) AliasesForResource(alias string) ([]string, bool)

AliasesForResource returns whether a resource has an alias or not

func (*DefaultRESTMapper) KindFor

func (*DefaultRESTMapper) KindsFor

func (*DefaultRESTMapper) RESTMapping

func (m *DefaultRESTMapper) RESTMapping(gk unversioned.GroupKind, versions ...string) (*RESTMapping, error)

RESTMapping returns a struct representing the resource path and conversion interfaces a RESTClient should use to operate on the provided group/kind in order of versions. If a version search order is not provided, the search order provided to DefaultRESTMapper will be used to resolve which version should be used to access the named group/kind. TODO: consider refactoring to use RESTMappings in a way that preserves version ordering and preference

func (*DefaultRESTMapper) RESTMappings

func (m *DefaultRESTMapper) RESTMappings(gk unversioned.GroupKind) ([]*RESTMapping, error)

RESTMappings returns the RESTMappings for the provided group kind in a rough internal preferred order. If no kind is found it will return a NoResourceMatchError.

func (*DefaultRESTMapper) ResourceFor

func (*DefaultRESTMapper) ResourceSingularizer

func (m *DefaultRESTMapper) ResourceSingularizer(resourceType string) (string, error)

ResourceSingularizer implements RESTMapper It converts a resource name from plural to singular (e.g., from pods to pod)

func (*DefaultRESTMapper) ResourcesFor

func (*DefaultRESTMapper) String

func (m *DefaultRESTMapper) String() string

type FirstHitRESTMapper

type FirstHitRESTMapper struct {
	MultiRESTMapper
}

FirstHitRESTMapper is a wrapper for multiple RESTMappers which returns the first successful result for the singular requests

func (FirstHitRESTMapper) KindFor

func (FirstHitRESTMapper) RESTMapping

func (m FirstHitRESTMapper) RESTMapping(gk unversioned.GroupKind, versions ...string) (*RESTMapping, error)

RESTMapping provides the REST mapping for the resource based on the kind and version. This implementation supports multiple REST schemas and return the first match.

func (FirstHitRESTMapper) ResourceFor

func (FirstHitRESTMapper) String

func (m FirstHitRESTMapper) String() string

type List

type List unversioned.List

List lets you work with list metadata from any of the versioned or internal API objects. Attempting to set or retrieve a field on an object that does not support that field will be a no-op and return a default value.

func ListAccessor

func ListAccessor(obj interface{}) (List, error)

ListAccessor returns a List interface for the provided object or an error if the object does not provide List. IMPORTANT: Objects are a superset of lists, so all Objects return List metadata. Do not use this check to determine whether an object *is* a List. TODO: return bool instead of error

type ListMetaAccessor

type ListMetaAccessor interface {
	GetListMeta() List
}

type MetadataAccessor

type MetadataAccessor interface {
	APIVersion(obj runtime.Object) (string, error)
	SetAPIVersion(obj runtime.Object, version string) error

	Kind(obj runtime.Object) (string, error)
	SetKind(obj runtime.Object, kind string) error

	Namespace(obj runtime.Object) (string, error)
	SetNamespace(obj runtime.Object, namespace string) error

	Name(obj runtime.Object) (string, error)
	SetName(obj runtime.Object, name string) error

	GenerateName(obj runtime.Object) (string, error)
	SetGenerateName(obj runtime.Object, name string) error

	UID(obj runtime.Object) (types.UID, error)
	SetUID(obj runtime.Object, uid types.UID) error

	SelfLink(obj runtime.Object) (string, error)
	SetSelfLink(obj runtime.Object, selfLink string) error

	Labels(obj runtime.Object) (map[string]string, error)
	SetLabels(obj runtime.Object, labels map[string]string) error

	Annotations(obj runtime.Object) (map[string]string, error)
	SetAnnotations(obj runtime.Object, annotations map[string]string) error

	runtime.ResourceVersioner
}

MetadataAccessor lets you work with object and list metadata from any of the versioned or internal API objects. Attempting to set or retrieve a field on an object that does not support that field (Name, UID, Namespace on lists) will be a no-op and return a default value.

MetadataAccessor exposes Interface in a way that can be used with multiple objects.

func NewAccessor

func NewAccessor() MetadataAccessor

NewAccessor returns a MetadataAccessor that can retrieve or manipulate resource version on objects derived from core API metadata concepts.

type MultiRESTMapper

type MultiRESTMapper []RESTMapper

MultiRESTMapper is a wrapper for multiple RESTMappers.

func (MultiRESTMapper) AliasesForResource

func (m MultiRESTMapper) AliasesForResource(alias string) ([]string, bool)

AliasesForResource finds the first alias response for the provided mappers.

func (MultiRESTMapper) KindFor

func (MultiRESTMapper) KindsFor

func (MultiRESTMapper) RESTMapping

func (m MultiRESTMapper) RESTMapping(gk unversioned.GroupKind, versions ...string) (*RESTMapping, error)

RESTMapping provides the REST mapping for the resource based on the kind and version. This implementation supports multiple REST schemas and return the first match.

func (MultiRESTMapper) RESTMappings

func (m MultiRESTMapper) RESTMappings(gk unversioned.GroupKind) ([]*RESTMapping, error)

RESTMappings returns all possible RESTMappings for the provided group kind, or an error if the type is not recognized.

func (MultiRESTMapper) ResourceFor

func (MultiRESTMapper) ResourceSingularizer

func (m MultiRESTMapper) ResourceSingularizer(resource string) (singular string, err error)

ResourceSingularizer converts a REST resource name from plural to singular (e.g., from pods to pod) This implementation supports multiple REST schemas and return the first match.

func (MultiRESTMapper) ResourcesFor

func (MultiRESTMapper) String

func (m MultiRESTMapper) String() string

type NoKindMatchError

type NoKindMatchError struct {
	PartialKind unversioned.GroupVersionKind
}

NoKindMatchError is returned if the RESTMapper can't find any match for a kind

func (*NoKindMatchError) Error

func (e *NoKindMatchError) Error() string

type NoResourceMatchError

type NoResourceMatchError struct {
	PartialResource unversioned.GroupVersionResource
}

NoResourceMatchError is returned if the RESTMapper can't find any match for a resource

func (*NoResourceMatchError) Error

func (e *NoResourceMatchError) Error() string

type Object

type Object interface {
	GetNamespace() string
	SetNamespace(namespace string)
	GetName() string
	SetName(name string)
	GetGenerateName() string
	SetGenerateName(name string)
	GetUID() types.UID
	SetUID(uid types.UID)
	GetResourceVersion() string
	SetResourceVersion(version string)
	GetSelfLink() string
	SetSelfLink(selfLink string)
	GetCreationTimestamp() unversioned.Time
	SetCreationTimestamp(timestamp unversioned.Time)
	GetDeletionTimestamp() *unversioned.Time
	SetDeletionTimestamp(timestamp *unversioned.Time)
	GetLabels() map[string]string
	SetLabels(labels map[string]string)
	GetAnnotations() map[string]string
	SetAnnotations(annotations map[string]string)
	GetFinalizers() []string
	SetFinalizers(finalizers []string)
	GetOwnerReferences() []metatypes.OwnerReference
	SetOwnerReferences([]metatypes.OwnerReference)
	GetClusterName() string
	SetClusterName(clusterName string)
}

Object lets you work with object metadata from any of the versioned or internal API objects. Attempting to set or retrieve a field on an object that does not support that field (Name, UID, Namespace on lists) will be a no-op and return a default value.

func Accessor

func Accessor(obj interface{}) (Object, error)

Accessor takes an arbitrary object pointer and returns meta.Interface. obj must be a pointer to an API type. An error is returned if the minimum required fields are missing. Fields that are not required return the default value and are a no-op if set. TODO: return bool instead of error

type ObjectMetaAccessor

type ObjectMetaAccessor interface {
	GetObjectMeta() Object
}

type PriorityRESTMapper

type PriorityRESTMapper struct {
	// Delegate is the RESTMapper to use to locate all the Kind and Resource matches
	Delegate RESTMapper

	// ResourcePriority is a list of priority patterns to apply to matching resources.
	// The list of all matching resources is narrowed based on the patterns until only one remains.
	// A pattern with no matches is skipped.  A pattern with more than one match uses its
	// matches as the list to continue matching against.
	ResourcePriority []unversioned.GroupVersionResource

	// KindPriority is a list of priority patterns to apply to matching kinds.
	// The list of all matching kinds is narrowed based on the patterns until only one remains.
	// A pattern with no matches is skipped.  A pattern with more than one match uses its
	// matches as the list to continue matching against.
	KindPriority []unversioned.GroupVersionKind
}

PriorityRESTMapper is a wrapper for automatically choosing a particular Resource or Kind when multiple matches are possible

func (PriorityRESTMapper) AliasesForResource

func (m PriorityRESTMapper) AliasesForResource(alias string) (aliases []string, ok bool)

func (PriorityRESTMapper) KindFor

func (m PriorityRESTMapper) KindFor(partiallySpecifiedResource unversioned.GroupVersionResource) (unversioned.GroupVersionKind, error)

KindFor finds all kinds, then passes them through the KindPriority patterns to find a single matching hit.

func (PriorityRESTMapper) KindsFor

func (m PriorityRESTMapper) KindsFor(partiallySpecifiedResource unversioned.GroupVersionResource) (gvk []unversioned.GroupVersionKind, err error)

func (PriorityRESTMapper) RESTMapping

func (m PriorityRESTMapper) RESTMapping(gk unversioned.GroupKind, versions ...string) (mapping *RESTMapping, err error)

func (PriorityRESTMapper) RESTMappings

func (m PriorityRESTMapper) RESTMappings(gk unversioned.GroupKind) ([]*RESTMapping, error)

func (PriorityRESTMapper) ResourceFor

func (m PriorityRESTMapper) ResourceFor(partiallySpecifiedResource unversioned.GroupVersionResource) (unversioned.GroupVersionResource, error)

ResourceFor finds all resources, then passes them through the ResourcePriority patterns to find a single matching hit.

func (PriorityRESTMapper) ResourceSingularizer

func (m PriorityRESTMapper) ResourceSingularizer(resource string) (singular string, err error)

func (PriorityRESTMapper) ResourcesFor

func (m PriorityRESTMapper) ResourcesFor(partiallySpecifiedResource unversioned.GroupVersionResource) ([]unversioned.GroupVersionResource, error)

func (PriorityRESTMapper) String

func (m PriorityRESTMapper) String() string

type RESTMapper

type RESTMapper interface {
	// KindFor takes a partial resource and returns the single match.  Returns an error if there are multiple matches
	KindFor(resource unversioned.GroupVersionResource) (unversioned.GroupVersionKind, error)

	// KindsFor takes a partial resource and returns the list of potential kinds in priority order
	KindsFor(resource unversioned.GroupVersionResource) ([]unversioned.GroupVersionKind, error)

	// ResourceFor takes a partial resource and returns the single match.  Returns an error if there are multiple matches
	ResourceFor(input unversioned.GroupVersionResource) (unversioned.GroupVersionResource, error)

	// ResourcesFor takes a partial resource and returns the list of potential resource in priority order
	ResourcesFor(input unversioned.GroupVersionResource) ([]unversioned.GroupVersionResource, error)

	// RESTMapping identifies a preferred resource mapping for the provided group kind.
	RESTMapping(gk unversioned.GroupKind, versions ...string) (*RESTMapping, error)
	// RESTMappings returns all resource mappings for the provided group kind.
	RESTMappings(gk unversioned.GroupKind) ([]*RESTMapping, error)

	AliasesForResource(resource string) ([]string, bool)
	ResourceSingularizer(resource string) (singular string, err error)
}

RESTMapper allows clients to map resources to kind, and map kind and version to interfaces for manipulating those objects. It is primarily intended for consumers of Kubernetes compatible REST APIs as defined in docs/devel/api-conventions.md.

The Kubernetes API provides versioned resources and object kinds which are scoped to API groups. In other words, kinds and resources should not be assumed to be unique across groups.

TODO: split into sub-interfaces

type RESTMapping

type RESTMapping struct {
	// Resource is a string representing the name of this resource as a REST client would see it
	Resource string

	GroupVersionKind unversioned.GroupVersionKind

	// Scope contains the information needed to deal with REST Resources that are in a resource hierarchy
	Scope RESTScope

	runtime.ObjectConvertor
	MetadataAccessor
}

RESTMapping contains the information needed to deal with objects of a specific resource and kind in a RESTful manner.

type RESTScope

type RESTScope interface {
	// Name of the scope
	Name() RESTScopeName
	// ParamName is the optional name of the parameter that should be inserted in the resource url
	// If empty, no param will be inserted
	ParamName() string
	// ArgumentName is the optional name that should be used for the variable holding the value.
	ArgumentName() string
	// ParamDescription is the optional description to use to document the parameter in api documentation
	ParamDescription() string
}

RESTScope contains the information needed to deal with REST resources that are in a resource hierarchy

type RESTScopeName

type RESTScopeName string
const (
	RESTScopeNameNamespace RESTScopeName = "namespace"
	RESTScopeNameRoot      RESTScopeName = "root"
)

type Type

type Type unversioned.Type

Type exposes the type and APIVersion of versioned or internal API objects.

func TypeAccessor

func TypeAccessor(obj interface{}) (Type, error)

TypeAccessor returns an interface that allows retrieving and modifying the APIVersion and Kind of an in-memory internal object. TODO: this interface is used to test code that does not have ObjectMeta or ListMeta in round tripping (objects which can use apiVersion/kind, but do not fit the Kube api conventions).

type VersionInterfaces

type VersionInterfaces struct {
	runtime.ObjectConvertor
	MetadataAccessor
}

VersionInterfaces contains the interfaces one should use for dealing with types of a particular version.

func InterfacesForUnstructured

func InterfacesForUnstructured(unversioned.GroupVersion) (*VersionInterfaces, error)

InterfacesForUnstructured returns VersionInterfaces suitable for dealing with runtime.Unstructured objects.

type VersionInterfacesFunc

type VersionInterfacesFunc func(version unversioned.GroupVersion) (*VersionInterfaces, error)

VersionInterfacesFunc returns the appropriate typer, and metadata accessor for a given api version, or an error if no such api version exists.

Directories

Path Synopsis
The types defined in this package are used by the meta package to represent the in-memory version of objects.
The types defined in this package are used by the meta package to represent the in-memory version of objects.

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