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support for binary marshaler/unmarshaler (#17)
Finally fix (de)serialization
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,141 @@ | ||
| package gtrsconvert | ||
|
|
||
| import ( | ||
| "encoding" | ||
| "reflect" | ||
| "strconv" | ||
| "time" | ||
| ) | ||
|
|
||
| // ConvertibleTo is implemented by types that can convert themselves to a map. | ||
| type ConvertibleTo interface { | ||
| ToMap() (map[string]any, error) | ||
| } | ||
|
|
||
| // ConvertibleFrom is implemented by types that can load themselves from a map. | ||
| type ConvertibleFrom interface { | ||
| FromMap(map[string]any) error | ||
| } | ||
|
|
||
| // structToMap convert a struct to a map. | ||
| func StructToMap(st any) (map[string]any, error) { | ||
| if c, ok := st.(ConvertibleTo); ok { | ||
| return c.ToMap() | ||
| } | ||
|
|
||
| rv := reflect.ValueOf(st) | ||
| rt := reflect.TypeOf(st) | ||
| out := make(map[string]interface{}, rv.NumField()) | ||
|
|
||
| for i := 0; i < rv.NumField(); i++ { | ||
| fieldValue := rv.Field(i) | ||
| fieldType := rt.Field(i) | ||
| fieldName := getFieldNameFromType(fieldType) | ||
| switch v := fieldValue.Interface().(type) { | ||
| case time.Duration: | ||
| out[fieldName] = v.String() | ||
| case encoding.BinaryMarshaler: | ||
| txt, err := v.MarshalBinary() | ||
| if err != nil { | ||
| return nil, SerializeError{ | ||
| Field: fieldType.Name, | ||
| Value: fieldValue.Interface(), | ||
| Err: err, | ||
| } | ||
| } | ||
| out[fieldName] = string(txt) | ||
| default: | ||
| out[fieldName] = fieldValue.Interface() | ||
| } | ||
| } | ||
| return out, nil | ||
| } | ||
|
|
||
| // mapToStruct tries to convert a map to a struct. | ||
| func MapToStruct(st any, data map[string]any) error { | ||
| rv := reflect.ValueOf(st).Elem() | ||
| rt := reflect.TypeOf(st) | ||
|
|
||
| if rt.Implements(typeOf[ConvertibleFrom]()) { | ||
| if c, ok := st.(ConvertibleFrom); ok { | ||
| return c.FromMap(data) | ||
| } | ||
| } | ||
|
|
||
| rt = rt.Elem() | ||
|
|
||
| for i := 0; i < rt.NumField(); i += 1 { | ||
| fieldRv := rv.Field(i) | ||
| fieldRt := rt.Field(i) | ||
|
|
||
| v, ok := data[getFieldNameFromType(fieldRt)] | ||
| if !ok { | ||
| continue | ||
| } | ||
|
|
||
| // The redis client always sends strings. | ||
| stval, ok := v.(string) | ||
| if !ok { | ||
| continue | ||
| } | ||
|
|
||
| val, err := valueFromString(fieldRv, stval) | ||
| if err != nil { | ||
| return FieldParseError{Field: fieldRt.Name, Value: v, Err: err} | ||
| } else { | ||
| fieldRv.Set(reflect.ValueOf(val)) | ||
| } | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| // Parse value from string | ||
| // TODO: find a better solution. Maybe there is a library for this. | ||
| func valueFromString(val reflect.Value, st string) (any, error) { | ||
| iface := val.Interface() | ||
|
|
||
| switch cast := iface.(type) { | ||
| case string: | ||
| return st, nil | ||
| case bool: | ||
| return strconv.ParseBool(st) | ||
| case int: | ||
| v, err := strconv.ParseInt(st, 10, 0) | ||
| return int(v), err | ||
| case uint: | ||
| v, err := strconv.ParseUint(st, 10, 0) | ||
| return uint(v), err | ||
| case int32: | ||
| v, err := strconv.ParseInt(st, 10, 32) | ||
| return int32(v), err | ||
| case uint32: | ||
| v, err := strconv.ParseUint(st, 10, 32) | ||
| return uint32(v), err | ||
| case int64: | ||
| return strconv.ParseInt(st, 10, 64) | ||
| case uint64: | ||
| return strconv.ParseUint(st, 10, 64) | ||
| case float32: | ||
| v, err := strconv.ParseFloat(st, 32) | ||
| return float32(v), err | ||
| case float64: | ||
| return strconv.ParseFloat(st, 64) | ||
| case time.Duration: | ||
| return time.ParseDuration(st) | ||
| case encoding.BinaryUnmarshaler: | ||
| return cast, cast.UnmarshalBinary([]byte(st)) | ||
| default: | ||
| ifaceptr := val.Addr().Interface() | ||
| unMarshaler, ok := ifaceptr.(encoding.BinaryUnmarshaler) | ||
| if ok { | ||
| err := unMarshaler.UnmarshalBinary([]byte(st)) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| res := reflect.ValueOf(unMarshaler).Elem().Interface() | ||
| return res, nil | ||
| } | ||
| } | ||
|
|
||
| return nil, ErrUnsupportedFieldType | ||
| } |
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