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Manually set GVK in extract, add commentary to extractor

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Kubernetes-commit: dda31bbf2e7a94624e3679e3db56c95e66509ce0
This commit is contained in:
Kevin Delgado 2021-07-08 01:56:58 +00:00 committed by Kubernetes Publisher
parent 690f06e07a
commit 7525c0e37a
1 changed files with 22 additions and 8 deletions
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30
applyconfigurations/meta/v1/unstructured.go
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@ -10,20 +10,27 @@ import (
"sigs.k8s.io/structured-merge-diff/v4/typed"
)
// UnstructuredExtractor enables extracting the applied configuration state from object for fieldManager into an
// unstructured object type.
type UnstructuredExtractor interface {
ExtractUnstructured(object *unstructured.Unstructured, fieldManager string) (*unstructured.Unstructured, error)
ExtractUnstructuredStatus(object *unstructured.Unstructured, fieldManager string) (*unstructured.Unstructured, error)
}
type parserCache interface {
parserForGVK(gvk schema.GroupVersionKind) (*typed.ParseableType, error)
// objectTypeCache is a cache of typed.ParseableTypes
type objectTypeCache interface {
objectTypeForGVK(gvk schema.GroupVersionKind) (*typed.ParseableType, error)
}
type nonCachingParserCache struct {
// nonCachingObjectTypeCache is a objectTypeCache that does no caching
// (i.e. it downloads the OpenAPISchema every time)
// Useful during the proof-of-concept stage until we agree on a caching solution.
type nonCachingObjectTypeCache struct {
discoveryClient *discovery.DiscoveryClient
}
func (c *nonCachingParserCache) parserForGVK(gvk schema.GroupVersionKind) (*typed.ParseableType, error) {
// objectTypeForGVK retrieves the typed.ParseableType for a given gvk from the cache
func (c *nonCachingObjectTypeCache) objectTypeForGVK(gvk schema.GroupVersionKind) (*typed.ParseableType, error) {
doc, err := c.discoveryClient.OpenAPISchema()
if err != nil {
return nil, err
@ -43,31 +50,38 @@ func (c *nonCachingParserCache) parserForGVK(gvk schema.GroupVersionKind) (*type
}
type extractor struct {
cache parserCache
cache objectTypeCache
}
// NewUnstructuredExtractor creates the extractor with which you can extract the applied configuration
// for a given manager from an unstructured object.
func NewUnstructuredExtractor(dc *discovery.DiscoveryClient) UnstructuredExtractor {
return &extractor{
cache: &nonCachingParserCache{dc},
cache: &nonCachingObjectTypeCache{dc},
}
}
// ExtractUnstructured extracts the applied configuration owned by fiieldManager from an unstructured object.
// Note that the apply configuration itself is also an unstructured object.
func (e *extractor) ExtractUnstructured(object *unstructured.Unstructured, fieldManager string) (*unstructured.Unstructured, error) {
return e.extractUnstructured(object, fieldManager, "")
}
// ExtractUnstructuredStatus is the same as ExtractUnstructured except
// that it extracts the status subresource applied configuration.
// Experimental!
func (e *extractor) ExtractUnstructuredStatus(object *unstructured.Unstructured, fieldManager string) (*unstructured.Unstructured, error) {
return e.extractUnstructured(object, fieldManager, "status")
}
func (e *extractor) extractUnstructured(object *unstructured.Unstructured, fieldManager string, subresource string) (*unstructured.Unstructured, error) {
gvk := object.GetObjectKind().GroupVersionKind()
parser, err := e.cache.parserForGVK(gvk)
objectType, err := e.cache.objectTypeForGVK(gvk)
if err != nil {
return nil, err
}
result := &unstructured.Unstructured{}
err = managedfields.ExtractInto(object, *parser, fieldManager, result, subresource)
err = managedfields.ExtractInto(object, *objectType, fieldManager, result, subresource)
if err != nil {
return nil, err
}