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diff_normalizer.go
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diff_normalizer.go
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package argo
import (
"encoding/json"
"strings"
"github.com/argoproj/argo-cd/pkg/apis/application/v1alpha1"
"github.com/argoproj/argo-cd/util/diff"
jsonpatch "github.com/evanphx/json-patch"
log "github.com/sirupsen/logrus"
"gopkg.in/yaml.v2"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
"k8s.io/apimachinery/pkg/runtime/schema"
)
type normalizerPatch struct {
groupKind schema.GroupKind
namespace string
name string
patch jsonpatch.Patch
}
type normalizer struct {
patches []normalizerPatch
}
type overrideIgnoreDiff struct {
JSONPointers []string `yaml:"jsonPointers"`
}
// NewDiffNormalizer creates diff normalizer which removes ignored fields according to given application spec and resource overrides
func NewDiffNormalizer(ignore []v1alpha1.ResourceIgnoreDifferences, overrides map[string]v1alpha1.ResourceOverride) (diff.Normalizer, error) {
for key, override := range overrides {
parts := strings.Split(key, "/")
if len(parts) < 2 {
continue
}
group := parts[0]
kind := parts[1]
if override.IgnoreDifferences != "" {
ignoreSettings := overrideIgnoreDiff{}
err := yaml.Unmarshal([]byte(override.IgnoreDifferences), &ignoreSettings)
if err != nil {
return nil, err
}
ignore = append(ignore, v1alpha1.ResourceIgnoreDifferences{
Group: group,
Kind: kind,
JSONPointers: ignoreSettings.JSONPointers,
})
}
}
patches := make([]normalizerPatch, 0)
for i := range ignore {
for _, path := range ignore[i].JSONPointers {
patchData, err := json.Marshal([]map[string]string{{"op": "remove", "path": path}})
if err != nil {
return nil, err
}
patch, err := jsonpatch.DecodePatch(patchData)
if err != nil {
return nil, err
}
patches = append(patches, normalizerPatch{
groupKind: schema.GroupKind{Group: ignore[i].Group, Kind: ignore[i].Kind},
name: ignore[i].Name,
namespace: ignore[i].Namespace,
patch: patch,
})
}
}
return &normalizer{patches: patches}, nil
}
// Normalize removes fields from supplied resource using json paths from matching items of specified resources ignored differences list
func (n *normalizer) Normalize(un *unstructured.Unstructured) error {
matched := make([]normalizerPatch, 0)
for _, patch := range n.patches {
groupKind := un.GroupVersionKind().GroupKind()
if groupKind == patch.groupKind &&
(patch.name == "" || patch.name == un.GetName()) &&
(patch.namespace == "" || patch.namespace == un.GetNamespace()) {
matched = append(matched, patch)
}
}
if len(matched) == 0 {
return nil
}
docData, err := json.Marshal(un)
if err != nil {
return err
}
for _, patch := range matched {
patchedData, err := patch.patch.Apply(docData)
if err != nil {
log.Debugf("Failed to apply normalization: %v", err)
continue
}
docData = patchedData
}
err = json.Unmarshal(docData, un)
if err != nil {
return err
}
return nil
}