/
patches.go
203 lines (184 loc) · 5.99 KB
/
patches.go
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package transformer
import (
"context"
"errors"
"fmt"
"github.com/armory/spinnaker-operator/pkg/apis/spinnaker/interfaces"
"github.com/armory/spinnaker-operator/pkg/generated"
jsonpatch "github.com/evanphx/json-patch"
"github.com/go-logr/logr"
appsv1 "k8s.io/api/apps/v1"
v1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/apimachinery/pkg/types"
"k8s.io/apimachinery/pkg/util/strategicpatch"
"k8s.io/apimachinery/pkg/util/yaml"
"k8s.io/code-generator/_examples/apiserver/clientset/internalversion/scheme"
"sigs.k8s.io/controller-runtime/pkg/client"
"strings"
)
// Applies patches
type patchTransformer struct {
svc interfaces.SpinnakerService
log logr.Logger
}
type PatchTransformerGenerator struct{}
func (g *PatchTransformerGenerator) NewTransformer(svc interfaces.SpinnakerService,
client client.Client, log logr.Logger, scheme *runtime.Scheme) (Transformer, error) {
tr := patchTransformer{svc: svc, log: log}
return &tr, nil
}
func (g *PatchTransformerGenerator) GetName() string {
return "Patches"
}
// nop
func (p *patchTransformer) TransformConfig(ctx context.Context) error {
return nil
}
func (p *patchTransformer) TransformManifests(ctx context.Context, gen *generated.SpinnakerGeneratedConfig) error {
for k, kust := range p.svc.GetKustomization() {
s, ok := gen.Config[k]
if ok {
if err := p.applyKustomization(k, kust, &s); err != nil {
return err
}
gen.Config[k] = s
}
}
return nil
}
func (p *patchTransformer) applyKustomization(spinsvc string, kustomization interfaces.ServiceKustomization, config *generated.ServiceConfig) error {
if kustomization.Deployment != nil {
if config.Deployment == nil {
return fmt.Errorf("deployment not generated for service %s, unable to apply kustomization", spinsvc)
}
data, err := p.applyPatches(spinsvc, kustomization.Deployment, config.Deployment)
if err != nil {
return err
}
dep, err := p.asDeployment(data)
if err != nil {
return err
}
config.Deployment = dep
}
if kustomization.Service != nil {
if config.Service == nil {
return fmt.Errorf("service not generated for service %s, unable to apply kustomization", spinsvc)
}
data, err := p.applyPatches(spinsvc, kustomization.Service, config.Service)
if err != nil {
return err
}
svc, err := p.asService(data)
if err != nil {
return err
}
config.Service = svc
}
return nil
}
func (p *patchTransformer) applyPatches(spinsvc string, kustomization *interfaces.Kustomization, obj runtime.Object) ([]byte, error) {
originalObjJS, err := runtime.Encode(unstructured.UnstructuredJSONScheme, obj)
if err != nil {
return nil, err
}
c := &creator{}
gvk := obj.GetObjectKind().GroupVersionKind()
for i, patch := range kustomization.Patches {
originalObjJS, err = getPatchedJSON(types.MergePatchType, originalObjJS, []byte(patch), gvk, c)
if err != nil {
return nil, fmt.Errorf("unable to apply json patch for %s at index %d: %v", spinsvc, i, err)
}
}
if kustomization.PatchesJson6902 != "" {
originalObjJS, err = getPatchedJSON(types.JSONPatchType, originalObjJS, []byte(kustomization.PatchesJson6902), gvk, c)
if err != nil {
return nil, fmt.Errorf("unable to apply json6902 patch for %s: %v", spinsvc, err)
}
}
for i, patch := range kustomization.PatchesStrategicMerge {
originalObjJS, err = getPatchedJSON(types.StrategicMergePatchType, originalObjJS, []byte(patch), gvk, c)
if err != nil {
return nil, fmt.Errorf("unable to apply strategic merge patch for %s at index %d: %v", spinsvc, i, err)
}
}
return originalObjJS, nil
}
func (p *patchTransformer) asDeployment(data []byte) (*appsv1.Deployment, error) {
dser := scheme.Codecs.UniversalDecoder()
dep := &appsv1.Deployment{}
obj, _, err := dser.Decode(data, &schema.GroupVersionKind{
Group: "apps",
Version: "v1",
Kind: "Deployment",
}, dep)
if err != nil {
return nil, err
}
if dep, ok := obj.(*appsv1.Deployment); ok {
return dep, nil
}
return nil, errors.New("not parsed as a deployment, patching failed")
}
func (p *patchTransformer) asService(data []byte) (*v1.Service, error) {
dser := scheme.Codecs.UniversalDecoder()
svc := &v1.Service{}
obj, _, err := dser.Decode(data, &schema.GroupVersionKind{
Group: "",
Version: "v1",
Kind: "Service",
}, svc)
if err != nil {
return nil, err
}
if svc, ok := obj.(*v1.Service); ok {
return svc, nil
}
return nil, errors.New("not parsed as a service, patching failed")
}
type creator struct{}
func (c *creator) New(gvk schema.GroupVersionKind) (runtime.Object, error) {
if gvk.Kind == "Deployment" {
return &appsv1.Deployment{}, nil
}
if gvk.Kind == "Service" {
return &v1.Service{}, nil
}
return nil, fmt.Errorf("unknown gvk to patch %s", gvk.String())
}
func getPatchedJSON(patchType types.PatchType, originalJS, patchJS []byte, gvk schema.GroupVersionKind, creater runtime.ObjectCreater) ([]byte, error) {
patchJS, err := yaml.ToJSON(patchJS)
if err != nil {
return nil, err
}
switch patchType {
case types.JSONPatchType:
patchObj, err := jsonpatch.DecodePatch(patchJS)
if err != nil {
return nil, err
}
bytes, err := patchObj.Apply(originalJS)
// TODO: This is pretty hacky, we need a better structured error from the json-patch
if err != nil && strings.Contains(err.Error(), "doc is missing key") {
msg := err.Error()
ix := strings.Index(msg, "key:")
key := msg[ix+5:]
return bytes, fmt.Errorf("object to be patched is missing field (%s)", key)
}
return bytes, err
case types.MergePatchType:
return jsonpatch.MergePatch(originalJS, patchJS)
case types.StrategicMergePatchType:
// get a typed object for this GVK if we need to apply a strategic merge patch
obj, err := creater.New(gvk)
if err != nil {
return nil, fmt.Errorf("cannot apply strategic merge patch for %s locally", gvk.String())
}
return strategicpatch.StrategicMergePatch(originalJS, patchJS, obj)
default:
return nil, fmt.Errorf("unknown patching method: %v", patchType)
}
}