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package rest
import "reflect"
// PayloadMember returns the payload field member of i if there is one, or nil.
func PayloadMember(i interface{}) interface{} {
if i == nil {
return nil
}
v := reflect.ValueOf(i).Elem()
if !v.IsValid() {
return nil
}
if field, ok := v.Type().FieldByName("_"); ok {
if payloadName := field.Tag.Get("payload"); payloadName != "" {
field, _ := v.Type().FieldByName(payloadName)
if field.Tag.Get("type") != "structure" {
return nil
}
payload := v.FieldByName(payloadName)
if payload.IsValid() || (payload.Kind() == reflect.Ptr && !payload.IsNil()) {
return payload.Interface()
}
}
}
return nil
}
// PayloadType returns the type of a payload field member of i if there is one, or "".
func PayloadType(i interface{}) string {
v := reflect.Indirect(reflect.ValueOf(i))
if !v.IsValid() {
return ""
}
if field, ok := v.Type().FieldByName("_"); ok {
if payloadName := field.Tag.Get("payload"); payloadName != "" {
if member, ok := v.Type().FieldByName(payloadName); ok {
return member.Tag.Get("type")
}
}
}
return ""
}
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