519 lines
16 KiB
Go
519 lines
16 KiB
Go
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/*
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Copyright 2014 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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// TODO: move everything in this file to pkg/api/rest
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package meta
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import (
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"fmt"
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"sort"
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"strings"
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"k8s.io/apimachinery/pkg/runtime"
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"k8s.io/apimachinery/pkg/runtime/schema"
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)
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// Implements RESTScope interface
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type restScope struct {
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name RESTScopeName
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}
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func (r *restScope) Name() RESTScopeName {
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return r.name
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}
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var RESTScopeNamespace = &restScope{
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name: RESTScopeNameNamespace,
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}
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var RESTScopeRoot = &restScope{
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name: RESTScopeNameRoot,
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}
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// DefaultRESTMapper exposes mappings between the types defined in a
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// runtime.Scheme. It assumes that all types defined the provided scheme
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// can be mapped with the provided MetadataAccessor and Codec interfaces.
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//
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// The resource name of a Kind is defined as the lowercase,
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// English-plural version of the Kind string.
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// When converting from resource to Kind, the singular version of the
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// resource name is also accepted for convenience.
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//
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// TODO: Only accept plural for some operations for increased control?
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// (`get pod bar` vs `get pods bar`)
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type DefaultRESTMapper struct {
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defaultGroupVersions []schema.GroupVersion
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resourceToKind map[schema.GroupVersionResource]schema.GroupVersionKind
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kindToPluralResource map[schema.GroupVersionKind]schema.GroupVersionResource
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kindToScope map[schema.GroupVersionKind]RESTScope
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singularToPlural map[schema.GroupVersionResource]schema.GroupVersionResource
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pluralToSingular map[schema.GroupVersionResource]schema.GroupVersionResource
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}
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func (m *DefaultRESTMapper) String() string {
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return fmt.Sprintf("DefaultRESTMapper{kindToPluralResource=%v}", m.kindToPluralResource)
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}
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var _ RESTMapper = &DefaultRESTMapper{}
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// NewDefaultRESTMapper initializes a mapping between Kind and APIVersion
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// to a resource name and back based on the objects in a runtime.Scheme
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// and the Kubernetes API conventions. Takes a group name, a priority list of the versions
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// to search when an object has no default version (set empty to return an error),
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// and a function that retrieves the correct metadata for a given version.
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func NewDefaultRESTMapper(defaultGroupVersions []schema.GroupVersion) *DefaultRESTMapper {
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resourceToKind := make(map[schema.GroupVersionResource]schema.GroupVersionKind)
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kindToPluralResource := make(map[schema.GroupVersionKind]schema.GroupVersionResource)
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kindToScope := make(map[schema.GroupVersionKind]RESTScope)
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singularToPlural := make(map[schema.GroupVersionResource]schema.GroupVersionResource)
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pluralToSingular := make(map[schema.GroupVersionResource]schema.GroupVersionResource)
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// TODO: verify name mappings work correctly when versions differ
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return &DefaultRESTMapper{
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resourceToKind: resourceToKind,
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kindToPluralResource: kindToPluralResource,
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kindToScope: kindToScope,
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defaultGroupVersions: defaultGroupVersions,
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singularToPlural: singularToPlural,
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pluralToSingular: pluralToSingular,
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}
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}
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func (m *DefaultRESTMapper) Add(kind schema.GroupVersionKind, scope RESTScope) {
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plural, singular := UnsafeGuessKindToResource(kind)
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m.AddSpecific(kind, plural, singular, scope)
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}
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func (m *DefaultRESTMapper) AddSpecific(kind schema.GroupVersionKind, plural, singular schema.GroupVersionResource, scope RESTScope) {
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m.singularToPlural[singular] = plural
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m.pluralToSingular[plural] = singular
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m.resourceToKind[singular] = kind
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m.resourceToKind[plural] = kind
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m.kindToPluralResource[kind] = plural
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m.kindToScope[kind] = scope
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}
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// unpluralizedSuffixes is a list of resource suffixes that are the same plural and singular
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// This is only is only necessary because some bits of code are lazy and don't actually use the RESTMapper like they should.
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// TODO eliminate this so that different callers can correctly map to resources. This probably means updating all
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// callers to use the RESTMapper they mean.
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var unpluralizedSuffixes = []string{
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"endpoints",
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}
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// UnsafeGuessKindToResource converts Kind to a resource name.
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// Broken. This method only "sort of" works when used outside of this package. It assumes that Kinds and Resources match
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// and they aren't guaranteed to do so.
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func UnsafeGuessKindToResource(kind schema.GroupVersionKind) ( /*plural*/ schema.GroupVersionResource /*singular*/, schema.GroupVersionResource) {
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kindName := kind.Kind
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if len(kindName) == 0 {
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return schema.GroupVersionResource{}, schema.GroupVersionResource{}
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}
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singularName := strings.ToLower(kindName)
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singular := kind.GroupVersion().WithResource(singularName)
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for _, skip := range unpluralizedSuffixes {
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if strings.HasSuffix(singularName, skip) {
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return singular, singular
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}
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}
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switch string(singularName[len(singularName)-1]) {
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case "s":
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return kind.GroupVersion().WithResource(singularName + "es"), singular
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case "y":
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return kind.GroupVersion().WithResource(strings.TrimSuffix(singularName, "y") + "ies"), singular
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}
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return kind.GroupVersion().WithResource(singularName + "s"), singular
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}
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// ResourceSingularizer implements RESTMapper
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// It converts a resource name from plural to singular (e.g., from pods to pod)
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func (m *DefaultRESTMapper) ResourceSingularizer(resourceType string) (string, error) {
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partialResource := schema.GroupVersionResource{Resource: resourceType}
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resources, err := m.ResourcesFor(partialResource)
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if err != nil {
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return resourceType, err
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}
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singular := schema.GroupVersionResource{}
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for _, curr := range resources {
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currSingular, ok := m.pluralToSingular[curr]
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if !ok {
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continue
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}
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if singular.Empty() {
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singular = currSingular
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continue
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}
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if currSingular.Resource != singular.Resource {
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return resourceType, fmt.Errorf("multiple possible singular resources (%v) found for %v", resources, resourceType)
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}
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}
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if singular.Empty() {
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return resourceType, fmt.Errorf("no singular of resource %v has been defined", resourceType)
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}
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return singular.Resource, nil
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}
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// coerceResourceForMatching makes the resource lower case and converts internal versions to unspecified (legacy behavior)
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func coerceResourceForMatching(resource schema.GroupVersionResource) schema.GroupVersionResource {
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resource.Resource = strings.ToLower(resource.Resource)
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if resource.Version == runtime.APIVersionInternal {
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resource.Version = ""
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}
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return resource
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}
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func (m *DefaultRESTMapper) ResourcesFor(input schema.GroupVersionResource) ([]schema.GroupVersionResource, error) {
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resource := coerceResourceForMatching(input)
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hasResource := len(resource.Resource) > 0
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hasGroup := len(resource.Group) > 0
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hasVersion := len(resource.Version) > 0
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if !hasResource {
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return nil, fmt.Errorf("a resource must be present, got: %v", resource)
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}
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ret := []schema.GroupVersionResource{}
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switch {
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case hasGroup && hasVersion:
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// fully qualified. Find the exact match
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for plural, singular := range m.pluralToSingular {
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if singular == resource {
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ret = append(ret, plural)
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break
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}
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if plural == resource {
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ret = append(ret, plural)
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break
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}
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}
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case hasGroup:
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// given a group, prefer an exact match. If you don't find one, resort to a prefix match on group
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foundExactMatch := false
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requestedGroupResource := resource.GroupResource()
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for plural, singular := range m.pluralToSingular {
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if singular.GroupResource() == requestedGroupResource {
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foundExactMatch = true
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ret = append(ret, plural)
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}
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if plural.GroupResource() == requestedGroupResource {
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foundExactMatch = true
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ret = append(ret, plural)
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}
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}
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// if you didn't find an exact match, match on group prefixing. This allows storageclass.storage to match
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// storageclass.storage.k8s.io
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if !foundExactMatch {
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for plural, singular := range m.pluralToSingular {
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if !strings.HasPrefix(plural.Group, requestedGroupResource.Group) {
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continue
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}
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if singular.Resource == requestedGroupResource.Resource {
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ret = append(ret, plural)
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}
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if plural.Resource == requestedGroupResource.Resource {
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ret = append(ret, plural)
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}
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}
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}
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case hasVersion:
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for plural, singular := range m.pluralToSingular {
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if singular.Version == resource.Version && singular.Resource == resource.Resource {
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ret = append(ret, plural)
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}
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if plural.Version == resource.Version && plural.Resource == resource.Resource {
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ret = append(ret, plural)
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}
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}
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default:
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for plural, singular := range m.pluralToSingular {
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if singular.Resource == resource.Resource {
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ret = append(ret, plural)
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}
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if plural.Resource == resource.Resource {
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ret = append(ret, plural)
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}
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}
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}
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if len(ret) == 0 {
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return nil, &NoResourceMatchError{PartialResource: resource}
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}
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sort.Sort(resourceByPreferredGroupVersion{ret, m.defaultGroupVersions})
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return ret, nil
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}
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func (m *DefaultRESTMapper) ResourceFor(resource schema.GroupVersionResource) (schema.GroupVersionResource, error) {
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resources, err := m.ResourcesFor(resource)
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if err != nil {
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return schema.GroupVersionResource{}, err
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}
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if len(resources) == 1 {
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return resources[0], nil
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}
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return schema.GroupVersionResource{}, &AmbiguousResourceError{PartialResource: resource, MatchingResources: resources}
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}
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func (m *DefaultRESTMapper) KindsFor(input schema.GroupVersionResource) ([]schema.GroupVersionKind, error) {
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resource := coerceResourceForMatching(input)
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hasResource := len(resource.Resource) > 0
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hasGroup := len(resource.Group) > 0
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hasVersion := len(resource.Version) > 0
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if !hasResource {
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return nil, fmt.Errorf("a resource must be present, got: %v", resource)
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}
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ret := []schema.GroupVersionKind{}
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switch {
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// fully qualified. Find the exact match
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case hasGroup && hasVersion:
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kind, exists := m.resourceToKind[resource]
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if exists {
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ret = append(ret, kind)
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}
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case hasGroup:
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foundExactMatch := false
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requestedGroupResource := resource.GroupResource()
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for currResource, currKind := range m.resourceToKind {
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if currResource.GroupResource() == requestedGroupResource {
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foundExactMatch = true
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ret = append(ret, currKind)
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}
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}
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// if you didn't find an exact match, match on group prefixing. This allows storageclass.storage to match
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// storageclass.storage.k8s.io
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if !foundExactMatch {
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for currResource, currKind := range m.resourceToKind {
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if !strings.HasPrefix(currResource.Group, requestedGroupResource.Group) {
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continue
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}
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if currResource.Resource == requestedGroupResource.Resource {
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ret = append(ret, currKind)
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}
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}
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}
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case hasVersion:
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for currResource, currKind := range m.resourceToKind {
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if currResource.Version == resource.Version && currResource.Resource == resource.Resource {
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ret = append(ret, currKind)
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}
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}
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default:
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for currResource, currKind := range m.resourceToKind {
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if currResource.Resource == resource.Resource {
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ret = append(ret, currKind)
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}
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}
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}
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if len(ret) == 0 {
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return nil, &NoResourceMatchError{PartialResource: input}
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}
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sort.Sort(kindByPreferredGroupVersion{ret, m.defaultGroupVersions})
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return ret, nil
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}
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func (m *DefaultRESTMapper) KindFor(resource schema.GroupVersionResource) (schema.GroupVersionKind, error) {
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kinds, err := m.KindsFor(resource)
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if err != nil {
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return schema.GroupVersionKind{}, err
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}
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if len(kinds) == 1 {
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return kinds[0], nil
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}
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return schema.GroupVersionKind{}, &AmbiguousResourceError{PartialResource: resource, MatchingKinds: kinds}
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}
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type kindByPreferredGroupVersion struct {
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list []schema.GroupVersionKind
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sortOrder []schema.GroupVersion
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}
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func (o kindByPreferredGroupVersion) Len() int { return len(o.list) }
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func (o kindByPreferredGroupVersion) Swap(i, j int) { o.list[i], o.list[j] = o.list[j], o.list[i] }
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func (o kindByPreferredGroupVersion) Less(i, j int) bool {
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lhs := o.list[i]
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rhs := o.list[j]
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if lhs == rhs {
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return false
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}
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|
||
|
|
if lhs.GroupVersion() == rhs.GroupVersion() {
|
||
|
|
return lhs.Kind < rhs.Kind
|
||
|
|
}
|
||
|
|
|
||
|
|
// otherwise, the difference is in the GroupVersion, so we need to sort with respect to the preferred order
|
||
|
|
lhsIndex := -1
|
||
|
|
rhsIndex := -1
|
||
|
|
|
||
|
|
for i := range o.sortOrder {
|
||
|
|
if o.sortOrder[i] == lhs.GroupVersion() {
|
||
|
|
lhsIndex = i
|
||
|
|
}
|
||
|
|
if o.sortOrder[i] == rhs.GroupVersion() {
|
||
|
|
rhsIndex = i
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if rhsIndex == -1 {
|
||
|
|
return true
|
||
|
|
}
|
||
|
|
|
||
|
|
return lhsIndex < rhsIndex
|
||
|
|
}
|
||
|
|
|
||
|
|
type resourceByPreferredGroupVersion struct {
|
||
|
|
list []schema.GroupVersionResource
|
||
|
|
sortOrder []schema.GroupVersion
|
||
|
|
}
|
||
|
|
|
||
|
|
func (o resourceByPreferredGroupVersion) Len() int { return len(o.list) }
|
||
|
|
func (o resourceByPreferredGroupVersion) Swap(i, j int) { o.list[i], o.list[j] = o.list[j], o.list[i] }
|
||
|
|
func (o resourceByPreferredGroupVersion) Less(i, j int) bool {
|
||
|
|
lhs := o.list[i]
|
||
|
|
rhs := o.list[j]
|
||
|
|
if lhs == rhs {
|
||
|
|
return false
|
||
|
|
}
|
||
|
|
|
||
|
|
if lhs.GroupVersion() == rhs.GroupVersion() {
|
||
|
|
return lhs.Resource < rhs.Resource
|
||
|
|
}
|
||
|
|
|
||
|
|
// otherwise, the difference is in the GroupVersion, so we need to sort with respect to the preferred order
|
||
|
|
lhsIndex := -1
|
||
|
|
rhsIndex := -1
|
||
|
|
|
||
|
|
for i := range o.sortOrder {
|
||
|
|
if o.sortOrder[i] == lhs.GroupVersion() {
|
||
|
|
lhsIndex = i
|
||
|
|
}
|
||
|
|
if o.sortOrder[i] == rhs.GroupVersion() {
|
||
|
|
rhsIndex = i
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if rhsIndex == -1 {
|
||
|
|
return true
|
||
|
|
}
|
||
|
|
|
||
|
|
return lhsIndex < rhsIndex
|
||
|
|
}
|
||
|
|
|
||
|
|
// 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.
|
||
|
|
func (m *DefaultRESTMapper) RESTMapping(gk schema.GroupKind, versions ...string) (*RESTMapping, error) {
|
||
|
|
mappings, err := m.RESTMappings(gk, versions...)
|
||
|
|
if err != nil {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
if len(mappings) == 0 {
|
||
|
|
return nil, &NoKindMatchError{GroupKind: gk, SearchedVersions: versions}
|
||
|
|
}
|
||
|
|
// since we rely on RESTMappings method
|
||
|
|
// take the first match and return to the caller
|
||
|
|
// as this was the existing behavior.
|
||
|
|
return mappings[0], nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// RESTMappings returns the RESTMappings for the provided group kind. If a version search order
|
||
|
|
// is not provided, the search order provided to DefaultRESTMapper will be used.
|
||
|
|
func (m *DefaultRESTMapper) RESTMappings(gk schema.GroupKind, versions ...string) ([]*RESTMapping, error) {
|
||
|
|
mappings := make([]*RESTMapping, 0)
|
||
|
|
potentialGVK := make([]schema.GroupVersionKind, 0)
|
||
|
|
hadVersion := false
|
||
|
|
|
||
|
|
// Pick an appropriate version
|
||
|
|
for _, version := range versions {
|
||
|
|
if len(version) == 0 || version == runtime.APIVersionInternal {
|
||
|
|
continue
|
||
|
|
}
|
||
|
|
currGVK := gk.WithVersion(version)
|
||
|
|
hadVersion = true
|
||
|
|
if _, ok := m.kindToPluralResource[currGVK]; ok {
|
||
|
|
potentialGVK = append(potentialGVK, currGVK)
|
||
|
|
break
|
||
|
|
}
|
||
|
|
}
|
||
|
|
// Use the default preferred versions
|
||
|
|
if !hadVersion && len(potentialGVK) == 0 {
|
||
|
|
for _, gv := range m.defaultGroupVersions {
|
||
|
|
if gv.Group != gk.Group {
|
||
|
|
continue
|
||
|
|
}
|
||
|
|
potentialGVK = append(potentialGVK, gk.WithVersion(gv.Version))
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if len(potentialGVK) == 0 {
|
||
|
|
return nil, &NoKindMatchError{GroupKind: gk, SearchedVersions: versions}
|
||
|
|
}
|
||
|
|
|
||
|
|
for _, gvk := range potentialGVK {
|
||
|
|
//Ensure we have a REST mapping
|
||
|
|
res, ok := m.kindToPluralResource[gvk]
|
||
|
|
if !ok {
|
||
|
|
continue
|
||
|
|
}
|
||
|
|
|
||
|
|
// Ensure we have a REST scope
|
||
|
|
scope, ok := m.kindToScope[gvk]
|
||
|
|
if !ok {
|
||
|
|
return nil, fmt.Errorf("the provided version %q and kind %q cannot be mapped to a supported scope", gvk.GroupVersion(), gvk.Kind)
|
||
|
|
}
|
||
|
|
|
||
|
|
mappings = append(mappings, &RESTMapping{
|
||
|
|
Resource: res,
|
||
|
|
GroupVersionKind: gvk,
|
||
|
|
Scope: scope,
|
||
|
|
})
|
||
|
|
}
|
||
|
|
|
||
|
|
if len(mappings) == 0 {
|
||
|
|
return nil, &NoResourceMatchError{PartialResource: schema.GroupVersionResource{Group: gk.Group, Resource: gk.Kind}}
|
||
|
|
}
|
||
|
|
return mappings, nil
|
||
|
|
}
|