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utils.go
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/
utils.go
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/*
Copyright 2021 Flant JSC
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package library
import (
"encoding/json"
"errors"
"os"
"path/filepath"
"reflect"
"strings"
"github.com/imdario/mergo"
"github.com/tidwall/gjson"
"gopkg.in/yaml.v3"
)
func GetModulesImagesDigests(modulePath string) (map[string]interface{}, error) {
var (
modulesDigests map[string]interface{}
search bool
)
if fi, err := os.Stat(filepath.Join(filepath.Dir(modulePath), "images_digests.json")); err != nil || fi.Size() == 0 {
search = true
}
var err error
if search {
modulesDigests = DefaultImagesDigests
} else {
modulesDigests, err = getModulesImagesDigestsFromLocalPath(modulePath)
if err != nil {
return nil, err
}
}
return modulesDigests, nil
}
func getModulesImagesDigestsFromLocalPath(modulePath string) (map[string]interface{}, error) {
var digests map[string]interface{}
imageDigestsRaw, err := os.ReadFile(filepath.Join(filepath.Dir(modulePath), "images_digests.json"))
if err != nil {
return nil, err
}
err = json.Unmarshal(imageDigestsRaw, &digests)
if err != nil {
return nil, err
}
return digests, nil
}
func InitValues(modulePath string, userDefinedValuesRaw []byte) (map[string]interface{}, error) {
var (
err error
testsValues map[string]interface{}
moduleValues map[string]interface{}
globalValues map[string]interface{}
moduleImagesValues map[string]interface{}
userDefinedValues map[string]interface{}
finalValues = new(map[string]interface{})
)
// 0. Get values from values-default.yaml
globalValuesRaw, err := os.ReadFile(filepath.Join("/deckhouse", "modules", "values.yaml"))
if err != nil && !errors.Is(err, os.ErrNotExist) {
return nil, err
}
err = yaml.Unmarshal(globalValuesRaw, &globalValues)
if err != nil {
return nil, err
}
// 1. Get values from modules/[module_name]/template_tests/values.yaml
testsValuesRaw, err := os.ReadFile(filepath.Join(modulePath, "template_tests", "values.yaml"))
if err != nil && !errors.Is(err, os.ErrNotExist) {
return nil, err
}
err = yaml.Unmarshal(testsValuesRaw, &testsValues)
if err != nil {
return nil, err
}
// 2. Get values from modules/[module_name]/values.yaml
moduleValuesRaw, err := os.ReadFile(filepath.Join(modulePath, "values.yaml"))
if err != nil && !errors.Is(err, os.ErrNotExist) {
return nil, err
}
err = yaml.Unmarshal(moduleValuesRaw, &moduleValues)
if err != nil {
return nil, err
}
// 3. Get image digests
digests, err := GetModulesImagesDigests(modulePath)
if err != nil {
return nil, err
}
moduleImagesValues = map[string]interface{}{
"global": map[string]interface{}{
"modulesImages": map[string]interface{}{
"digests": digests,
},
},
}
// 4. Get user-supplied values
err = yaml.Unmarshal(userDefinedValuesRaw, &userDefinedValues)
if err != nil {
return nil, err
}
err = mergeValues(finalValues, moduleValues, testsValues, globalValues, moduleImagesValues, userDefinedValues)
if err != nil {
return nil, err
}
return *finalValues, nil
}
func mergeValues(final *map[string]interface{}, iterations ...interface{}) error {
for _, valuesStructure := range iterations {
if valuesStructure != nil {
var newMap = map[string]interface{}{}
v := reflect.ValueOf(valuesStructure)
if v.Kind() == reflect.Map {
for _, key := range v.MapKeys() {
val := v.MapIndex(key)
newMap[key.String()] = val.Interface()
}
}
err := mergo.Merge(final, newMap, mergo.WithOverride)
if err != nil {
return err
}
}
}
return nil
}
// refactor into a "store" package
type KubeResult struct {
gjson.Result
}
func (kr KubeResult) AsStringSlice() []string {
array := kr.Array()
result := make([]string, 0, len(array))
for _, element := range array {
result = append(result, element.String())
}
return result
}
func (kr KubeResult) DropFields(fields ...string) KubeResult {
if !kr.IsObject() {
return kr
}
// Ignored fields index:
// - array with zero length -> fully ignored path
// - array -> field has subpaths to ignore
fieldsIdx := map[string][]string{}
for _, v := range fields {
parts := strings.SplitN(v, ".", 2)
root := parts[0]
// Field is fully ignored, its subpathes are not important now.
if len(parts) == 1 {
fieldsIdx[root] = make([]string, 0)
}
if v, ok := fieldsIdx[root]; ok {
// Index has zero length array, do not append subpaths.
if len(v) == 0 {
continue
}
} else {
fieldsIdx[root] = make([]string, 0)
}
if len(parts) > 1 {
fieldsIdx[root] = append(fieldsIdx[root], parts[1])
}
}
resMap := map[string]interface{}{}
kr.ForEach(func(key, value gjson.Result) bool {
keyStr := key.String()
newFields, ok := fieldsIdx[keyStr]
// Non-ignored field
if !ok {
resMap[keyStr] = json.RawMessage(value.Raw)
return true
}
// Fully ignored field.
if len(newFields) == 0 {
return true
}
// Recurse drop for field with ignored subpaths.
resMap[keyStr] = json.RawMessage(KubeResult{Result: value}.DropFields(newFields...).Raw)
return true
})
mapBytes, _ := json.Marshal(resMap)
return KubeResult{Result: gjson.ParseBytes(mapBytes)}
}