validateAlertmanagerConfig recursively scans the input config looking for data types for which we have a specific validation and, whenever encountered, it runs their validation. Returns the first error or nil if validation succeeds.
(cfg any)
| 375 | // we have a specific validation and, whenever encountered, it runs their validation. Returns the |
| 376 | // first error or nil if validation succeeds. |
| 377 | func validateAlertmanagerConfig(cfg any) error { |
| 378 | v := reflect.ValueOf(cfg) |
| 379 | t := v.Type() |
| 380 | |
| 381 | // Skip invalid, the zero value or a nil pointer (checked by zero value). |
| 382 | if !v.IsValid() || v.IsZero() { |
| 383 | return nil |
| 384 | } |
| 385 | |
| 386 | // If the input config is a pointer then we need to get its value. |
| 387 | // At this point the pointer value can't be nil. |
| 388 | if v.Kind() == reflect.Ptr { |
| 389 | v = v.Elem() |
| 390 | t = v.Type() |
| 391 | } |
| 392 | |
| 393 | // Check if the input config is a data type for which we have a specific validation. |
| 394 | if validator, ok := configValidators[t]; ok { |
| 395 | if validator != nil { |
| 396 | if err := validator(v.Interface()); err != nil { |
| 397 | return err |
| 398 | } |
| 399 | } |
| 400 | } else if strings.Contains(t.PkgPath(), "alertmanager/config") && |
| 401 | strings.HasSuffix(t.Name(), "Config") { |
| 402 | // Unhandled config type - fail to ensure we don't miss new types. |
| 403 | return fmt.Errorf("unsupported receiver config type: %s", t.Name()) |
| 404 | } |
| 405 | |
| 406 | // If the input config is a struct, recursively iterate on all fields. |
| 407 | if t.Kind() == reflect.Struct { |
| 408 | for i := 0; i < t.NumField(); i++ { |
| 409 | field := t.Field(i) |
| 410 | fieldValue := v.FieldByIndex(field.Index) |
| 411 | |
| 412 | // Skip any field value which can't be converted to interface (eg. primitive types). |
| 413 | if fieldValue.CanInterface() { |
| 414 | if err := validateAlertmanagerConfig(fieldValue.Interface()); err != nil { |
| 415 | return err |
| 416 | } |
| 417 | } |
| 418 | } |
| 419 | } |
| 420 | |
| 421 | if t.Kind() == reflect.Slice || t.Kind() == reflect.Array { |
| 422 | for i := 0; i < v.Len(); i++ { |
| 423 | fieldValue := v.Index(i) |
| 424 | |
| 425 | // Skip any field value which can't be converted to interface (eg. primitive types). |
| 426 | if fieldValue.CanInterface() { |
| 427 | if err := validateAlertmanagerConfig(fieldValue.Interface()); err != nil { |
| 428 | return err |
| 429 | } |
| 430 | } |
| 431 | } |
| 432 | } |
| 433 | |
| 434 | if t.Kind() == reflect.Map { |