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patching.go
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patching.go
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package convert
import (
"encoding/json"
"fmt"
"k8s.io/apimachinery/pkg/runtime/schema"
k8spatch "k8s.io/apimachinery/pkg/util/strategicpatch"
"log"
"os"
"path"
"reflect"
"sigs.k8s.io/yaml"
)
type JSONObject = map[string]any
type JSONArray = []any
type JSONValue = any
type PatchGenerator struct {
schemaClient *SchemaClient
}
func (pgr *PatchPartition) String() string {
jsonContent, _ := json.Marshal(pgr.base)
yamlContent, _ := yaml.JSONToYAML(jsonContent)
return fmt.Sprintf("gvk = %s\n\n%s", pgr.gvk, yamlContent)
}
func (pgr *PatchPartition) DumpToFolder(directoryPath string) error {
rootDir := path.Join(directoryPath, fmt.Sprintf("%s_%s_%s", pgr.gvk.Group, pgr.gvk.Version, pgr.gvk.Kind))
jsonContent, _ := json.Marshal(pgr.base)
yamlContent, _ := yaml.JSONToYAML(jsonContent)
err := os.Mkdir(rootDir, 0755)
if err != nil {
return err
}
err = WriteFile(yamlContent, path.Join(rootDir, "base.yaml"))
if err != nil {
return err
}
for _, source := range pgr.sources {
if len(source.patch) > 0 {
jsonContent, _ := json.Marshal(source.patch)
yamlContent, _ := yaml.JSONToYAML(jsonContent)
err = WriteFile(yamlContent, path.Join(rootDir, fmt.Sprintf("%s.yaml", source.name)))
if err != nil {
return err
}
}
}
return nil
}
func NewPatchGenerator(schemaFolderPath string) (*PatchGenerator, error) {
sc, err := NewSchemaClient(schemaFolderPath)
if err != nil {
return nil, err
}
c := &PatchGenerator{
sc,
}
return c, nil
}
func (pgr *PatchPartition) GetBaseYAML() ([]byte, error) {
baseBytes, err := json.MarshalIndent(pgr.base, "", " ")
if err != nil {
return nil, err
}
return yaml.JSONToYAML(baseBytes)
}
func (pgr *PatchPartition) GetPatchYAMLs() ([][]byte, error) {
result := [][]byte{}
for _, source := range pgr.sources {
if len(source.patch) > 0 {
jsonBytes, err := json.MarshalIndent(source.patch, "", " ")
if err != nil {
return nil, err
}
yamlBytes, err := yaml.JSONToYAML(jsonBytes)
if err != nil {
return nil, err
}
result = append(result, yamlBytes)
}
}
return result, nil
}
func (pgr *PatchPartition) GetOriginalYAMLs() ([][]byte, error) {
result := [][]byte{}
for _, source := range pgr.sources {
jsonBytes, err := json.MarshalIndent(source.original, "", " ")
if err != nil {
return nil, err
}
yamlBytes, err := yaml.JSONToYAML(jsonBytes)
if err != nil {
return nil, err
}
result = append(result, yamlBytes)
}
return result, nil
}
type PatchSource struct {
name string
original JSONObject
patch JSONObject
}
type PatchPartition struct {
gvk schema.GroupVersionKind
base JSONObject
sources []PatchSource
}
func (pg *PatchGenerator) Execute(resources []JSONObject) ([]PatchPartition, error) {
partitions := map[schema.GroupVersionKind]PatchPartition{}
for _, resource := range resources {
gvk, err := ComputeGVK(resource)
if err != nil {
return nil, err
}
name, err := GetResourceName(resource)
if err != nil {
return nil, err
}
partition, ok := partitions[*gvk]
if ok {
next := append(partition.sources, PatchSource{
name: name,
original: resource,
patch: JSONObject{},
})
partition.sources = next
partitions[*gvk] = partition
} else {
partitions[*gvk] = PatchPartition{
gvk: *gvk,
base: JSONObject{},
sources: []PatchSource{{
name: name,
original: resource,
patch: JSONObject{},
}},
}
}
}
outputPartitions := map[schema.GroupVersionKind]PatchPartition{}
for gvk, partition := range partitions {
patchMeta, err := pg.schemaClient.GetPatchMetadata(gvk)
if err != nil {
return nil, err
}
partition.base = cloneJSON(partition.sources[0].original)
for i := 1; i < len(partition.sources); i++ {
other := partition.sources[i]
patch, err := calculatePatch(other.original, partition.base, patchMeta)
if err != nil {
return nil, err
}
nextBase, err := subtractObject(partition.base, patch, k8spatch.PatchMeta{}, patchMeta)
if err != nil {
return nil, err
}
partition.base = nextBase
}
for i := 0; i < len(partition.sources); i++ {
item := partition.sources[i]
patch, err := calculatePatch(partition.base, item.original, patchMeta)
if err != nil {
return nil, err
}
orderedPatch, err := ExecutePatchOrdering(patch)
if err != nil {
return nil, err
}
item.patch = orderedPatch
partition.sources[i] = item
}
outputPartitions[gvk] = partition
}
results := make([]PatchPartition, 0, len(outputPartitions))
for _, value := range outputPartitions {
results = append(results, value)
}
return results, nil
}
func GetResourceName(resource JSONObject) (string, error) {
if metadata, ok := resource["metadata"]; ok {
if typedMetadata, ok := metadata.(JSONObject); ok {
if name, ok := typedMetadata["name"]; ok {
if typedName, ok := name.(string); ok {
return typedName, nil
}
}
}
}
return "", fmt.Errorf("required attribute 'name' not found in resource metadata")
}
func calculatePatch(content JSONObject, other JSONObject, lookupMeta k8spatch.LookupPatchMeta) (JSONObject, error) {
contentBytes, err := json.Marshal(content)
if err != nil {
return nil, err
}
otherBytes, err := json.Marshal(other)
if err != nil {
return nil, err
}
patchBytes, err := k8spatch.CreateTwoWayMergePatchUsingLookupPatchMeta(contentBytes, otherBytes, lookupMeta)
if err != nil {
return nil, err
}
var patch JSONObject
err = json.Unmarshal(patchBytes, &patch)
if err != nil {
return nil, err
}
return patch, nil
}
func subtractObject(a JSONObject, b JSONObject, patchMeta k8spatch.PatchMeta, patchContext k8spatch.LookupPatchMeta) (JSONObject, error) {
result := JSONObject{}
for k, aValue := range a {
if bValue, ok := b[k]; ok {
switch typedAValue := aValue.(type) {
case JSONObject:
if typedBValue, ok := bValue.(JSONObject); ok {
lookupMeta, patchMeta, err := patchContext.LookupPatchMetadataForStruct(k)
if err != nil {
return nil, err
}
result[k], err = subtractObject(typedAValue, typedBValue, patchMeta, lookupMeta)
if err != nil {
return nil, err
}
continue
} else {
log.Default().Printf("unexpected type mismatch while evaluating key '%s'\n", k)
}
case JSONArray:
if typedBValue, ok := bValue.(JSONArray); ok {
lookupMeta, patchMeta, err := patchContext.LookupPatchMetadataForSlice(k)
if err != nil {
return nil, err
}
if shouldSubtractList(patchMeta) {
result[k], err = subtractList(typedAValue, typedBValue, patchMeta, lookupMeta)
if err != nil {
return nil, err
}
continue
}
} else {
log.Default().Printf("unexpected type mismatch while evaluating key '%s'\n", k)
}
default:
if reflect.DeepEqual(aValue, bValue) && k != patchMeta.GetPatchMergeKey() {
continue
}
}
}
result[k] = aValue
}
return result, nil
}
func subtractList(a JSONArray, b JSONArray, listPatchMetadata k8spatch.PatchMeta, listSchema k8spatch.LookupPatchMeta) (JSONArray, error) {
result := JSONArray{}
for _, aValue := range a {
switch typedAValue := aValue.(type) {
case JSONObject:
subtractedItem, err := subtractObjectListItem(typedAValue, b, listPatchMetadata, listSchema)
if err != nil {
return nil, err
}
if subtractedItem != nil {
result = append(result, subtractedItem)
}
default:
subtractedItem := subtractNonObjectListItem(typedAValue, b)
if subtractedItem != nil {
result = append(result, subtractedItem)
}
}
}
return result, nil
}
func subtractObjectListItem(aValue JSONObject, b JSONArray, patchMeta k8spatch.PatchMeta, patchContext k8spatch.LookupPatchMeta) (JSONObject, error) {
mergeKey := patchMeta.GetPatchMergeKey()
aMergeValue, ok := aValue[mergeKey]
if !ok {
return nil, fmt.Errorf("unexpected missing merge key")
}
for _, bValue := range b {
switch typedBValue := bValue.(type) {
case JSONObject:
bMergeValue, ok := typedBValue[mergeKey]
if !ok {
return nil, fmt.Errorf("unexpected missing merge key")
}
if aMergeValue == bMergeValue {
subtractedObject, err := subtractObject(aValue, typedBValue, patchMeta, patchContext)
if err != nil {
return nil, err
}
if len(subtractedObject) > 0 {
return subtractedObject, nil
} else {
return nil, nil
}
}
}
}
return aValue, nil
}
func subtractNonObjectListItem(aValue JSONValue, b JSONArray) JSONValue {
for _, bValue := range b {
if reflect.DeepEqual(aValue, bValue) {
return nil
}
}
return aValue
}
func shouldSubtractList(patchMeta k8spatch.PatchMeta) bool {
strategies := patchMeta.GetPatchStrategies()
for _, strategy := range strategies {
if strategy == "merge" {
return true
}
}
return false
}