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struct.go
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struct.go
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package configo
import (
"errors"
"fmt"
"reflect"
"strconv"
"strings"
)
func ToStruct(dest interface{}) error {
if reflect.ValueOf(dest).Kind() != reflect.Ptr {
return errors.New("ptr expected")
}
return fillRecursively(reflect.ValueOf(dest).Elem())
}
func fillRecursively(v reflect.Value) error {
for i := 0; i < v.NumField(); i++ {
field := v.Field(i)
if field.Kind() == reflect.Struct {
err := fillRecursively(field)
if err != nil {
return err
}
}
var tagKey, tagDefaultValue string
if val := v.Type().Field(i).Tag.Get("env"); val != "" {
splited := strings.Split(val, ",")
if len(splited) == 0 {
return fmt.Errorf("wrong env tag format for %s", field.Type().Field(i).Name)
}
tagKey = splited[0]
if len(splited) >= 2 {
tagDefaultValue = splited[1]
}
}
switch field.Kind() {
case reflect.Int:
var defValue int
if tagDefaultValue != "" {
var err error
defValue, err = strconv.Atoi(tagDefaultValue)
if err != nil {
return err
}
}
field.SetInt(int64(EnvInt(tagKey, defValue)))
case reflect.String:
field.SetString(EnvString(tagKey, tagDefaultValue))
case reflect.Bool:
var defValue bool
if tagDefaultValue != "" {
var err error
defValue, err = strconv.ParseBool(tagDefaultValue)
if err != nil {
return err
}
}
field.SetBool(EnvBool(tagKey, defValue))
}
}
return nil
}