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|
package secrets
import (
"fmt"
"os"
"reflect"
"strconv"
)
func parseSetInt[T int | int8 | int16 | int32 | int64](f reflect.Value, v string, size int) error {
iv, err := strconv.ParseInt(v, 0, size)
if err != nil {
return err
}
f.Set(reflect.ValueOf(T(iv)))
return nil
}
func parseSetUint[T uint | uint8 | uint16 | uint32 | uint64](f reflect.Value, v string, size int) error {
iv, err := strconv.ParseUint(v, 0, size)
if err != nil {
return err
}
f.Set(reflect.ValueOf(T(iv)))
return nil
}
func parseSetFloat[T float32 | float64](f reflect.Value, v string, size int) error {
iv, err := strconv.ParseFloat(v, size)
if err != nil {
return err
}
f.Set(reflect.ValueOf(T(iv)))
return nil
}
func UnmarshalEnvironment(into any) error {
t := reflect.TypeOf(into).Elem()
o := reflect.ValueOf(into).Elem()
for i := 0; i < t.NumField(); i++ {
tf := t.Field(i)
f := o.FieldByName(tf.Name)
envName := tf.Tag.Get("env")
if envName == "" {
continue
}
envValue, ok := os.LookupEnv(envName)
if !ok {
continue
}
switch typ := f.Type().Kind(); typ {
case reflect.Bool:
b, err := strconv.ParseBool(envValue)
if err != nil {
return err
}
f.Set(reflect.ValueOf(b))
case reflect.String:
f.Set(reflect.ValueOf(envValue))
case reflect.Int:
if err := parseSetInt[int](f, envValue, 64); err != nil {
return err
}
case reflect.Int8:
if err := parseSetInt[int8](f, envValue, 8); err != nil {
return err
}
case reflect.Int16:
if err := parseSetInt[int16](f, envValue, 16); err != nil {
return err
}
case reflect.Int32:
if err := parseSetInt[int32](f, envValue, 32); err != nil {
return err
}
case reflect.Int64:
if err := parseSetInt[int64](f, envValue, 64); err != nil {
return err
}
case reflect.Uint:
if err := parseSetUint[uint](f, envValue, 64); err != nil {
return err
}
case reflect.Uint8:
if err := parseSetUint[uint8](f, envValue, 8); err != nil {
return err
}
case reflect.Uint16:
if err := parseSetUint[uint16](f, envValue, 16); err != nil {
return err
}
case reflect.Uint32:
if err := parseSetUint[uint32](f, envValue, 32); err != nil {
return err
}
case reflect.Uint64:
if err := parseSetUint[uint64](f, envValue, 64); err != nil {
return err
}
case reflect.Float32:
if err := parseSetFloat[float32](f, envValue, 32); err != nil {
return err
}
case reflect.Float64:
if err := parseSetFloat[float64](f, envValue, 64); err != nil {
return err
}
default:
return fmt.Errorf("UnmarshalEnvironment: unabled to handle type: %s", typ)
}
}
return nil
}
|
