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hook.go
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hook.go
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/***********************************************************************************************************************
*
* MIT License
*
* Copyright (c) 2022 Nicolas JUHEL
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
*
**********************************************************************************************************************/
package viper
import (
"math"
"reflect"
libmap "github.com/mitchellh/mapstructure"
spfvpr "github.com/spf13/viper"
)
func (v *viper) hookIdx() uint8 {
i := v.i.Load()
if i < math.MaxUint8 {
return uint8(i)
} else {
return math.MaxUint8
}
}
func (v *viper) hookIdxInc() uint8 {
v.i.Add(1)
return v.hookIdx()
}
func (v *viper) HookRegister(hook libmap.DecodeHookFunc) {
v.h.Store(v.hookIdxInc(), hook)
}
func (v *viper) HookReset() {
v.h.Clean()
}
func (v *viper) hookFuncViperDecoder() spfvpr.DecoderConfigOption {
return func(c *libmap.DecoderConfig) {
h := c.DecodeHook
c.DecodeHook = libmap.ComposeDecodeHookFunc(
v.hookFuncMapDecoder(),
h,
)
}
}
func (v *viper) hookFuncMapDecoder() libmap.DecodeHookFunc {
return func(f reflect.Value, t reflect.Value) (interface{}, error) {
var err error
data := f.Interface()
newFrom := f
v.h.Walk(func(key uint8, val interface{}) bool {
if val == nil {
return true
}
if data, err = libmap.DecodeHookExec(val, newFrom, t); err != nil {
return false
}
newFrom = reflect.ValueOf(data)
return true
})
if err != nil {
return nil, err
}
return data, nil
}
}