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cfg.go
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cfg.go
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// Copyright 2018-2023 CERN
//
// 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.
//
// In applying this license, CERN does not waive the privileges and immunities
// granted to it by virtue of its status as an Intergovernmental Organization
// or submit itself to any jurisdiction.
package cfg
import (
"errors"
"reflect"
"github.com/go-playground/locales/en"
ut "github.com/go-playground/universal-translator"
"github.com/go-playground/validator/v10"
en_translations "github.com/go-playground/validator/v10/translations/en"
"github.com/mitchellh/mapstructure"
)
// Setter is the interface a configuration struct may implement
// to set the default options.
type Setter interface {
// ApplyDefaults applies the default options.
ApplyDefaults()
}
var validate = validator.New()
var english = en.New()
var uni = ut.New(english, english)
var trans, _ = uni.GetTranslator("en")
var _ = en_translations.RegisterDefaultTranslations(validate, trans)
func init() {
validate.RegisterTagNameFunc(func(field reflect.StructField) string {
if k := field.Tag.Get("mapstructure"); k != "" {
return k
}
// if not specified, fall back to field name
return field.Name
})
}
// Decode decodes the given raw input interface to the target pointer c.
// It applies the default configuration if the target struct
// implements the Setter interface.
// It also perform a validation to all the fields of the configuration.
func Decode(input map[string]any, c any) error {
config := &mapstructure.DecoderConfig{
Metadata: nil,
Result: c,
}
decoder, err := mapstructure.NewDecoder(config)
if err != nil {
return err
}
if err := decoder.Decode(input); err != nil {
return err
}
if s, ok := c.(Setter); ok {
s.ApplyDefaults()
}
return translateError(validate.Struct(c), trans)
}
func translateError(err error, trans ut.Translator) error {
if err == nil {
return nil
}
errs := err.(validator.ValidationErrors)
translated := make([]error, 0, len(errs))
for _, err := range errs {
translated = append(translated, errors.New(err.Translate(trans)))
}
return errors.Join(translated...)
}