67 lines
1.3 KiB
Go
67 lines
1.3 KiB
Go
package env
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import (
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"fmt"
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"os"
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"reflect"
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"strconv"
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)
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func LoadEnv(data interface{}) error {
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v := reflect.ValueOf(data).Elem()
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if v.Kind() != reflect.Struct {
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return nil
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}
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t := v.Type()
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for i := 0; i < t.NumField(); i++ {
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f := v.Field(i)
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key := t.Field(i).Tag.Get("env")
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if key == "" {
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continue
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}
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if !f.CanSet() {
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continue
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}
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s := os.Getenv(key)
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var err error
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switch f.Kind() {
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case reflect.String:
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f.SetString(s)
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case reflect.Bool:
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var b bool
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if s == "" {
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f.SetBool(false)
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} else if b, err = strconv.ParseBool(s); err == nil {
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f.SetBool(b)
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}
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case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
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var i int64
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if s == "" {
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f.SetInt(0)
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} else if i, err = strconv.ParseInt(s, 10, 64); err == nil {
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f.SetInt(i)
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}
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case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
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var i uint64
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if s == "" {
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f.SetUint(0)
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} else if i, err = strconv.ParseUint(s, 10, 64); err == nil {
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f.SetUint(i)
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}
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case reflect.Float32, reflect.Float64:
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var n float64
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if s == "" {
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f.SetFloat(0.0)
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} else if n, err = strconv.ParseFloat(s, 64); err == nil {
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f.SetFloat(n)
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}
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default:
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continue
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}
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if err != nil {
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return fmt.Errorf("failed to load environment variable '%s': %v", key, err)
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}
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}
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return nil
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}
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