57 lines
1.5 KiB
Go
57 lines
1.5 KiB
Go
// Package codec is an interface for encoding messages
|
|
package codec
|
|
|
|
import (
|
|
"errors"
|
|
)
|
|
|
|
var (
|
|
// ErrInvalidMessage returned when invalid messge passed to codec
|
|
ErrInvalidMessage = errors.New("invalid message")
|
|
// ErrUnknownContentType returned when content-type is unknown
|
|
ErrUnknownContentType = errors.New("unknown content-type")
|
|
)
|
|
|
|
var (
|
|
// DefaultCodec is the global default codec
|
|
DefaultCodec = NewCodec()
|
|
// DefaultTagName specifies struct tag name to control codec Marshal/Unmarshal
|
|
DefaultTagName = "codec"
|
|
)
|
|
|
|
// Codec encodes/decodes various types of messages.
|
|
type Codec interface {
|
|
Marshal(v interface{}, opts ...Option) ([]byte, error)
|
|
Unmarshal(b []byte, v interface{}, opts ...Option) error
|
|
String() string
|
|
}
|
|
|
|
type CodecV2 interface {
|
|
Marshal(buf []byte, v interface{}, opts ...Option) ([]byte, error)
|
|
Unmarshal(buf []byte, v interface{}, opts ...Option) error
|
|
String() string
|
|
}
|
|
|
|
// RawMessage is a raw encoded JSON value.
|
|
// It implements Marshaler and Unmarshaler and can be used to delay decoding or precompute a encoding.
|
|
type RawMessage []byte
|
|
|
|
// MarshalJSON returns m as the JSON encoding of m.
|
|
func (m *RawMessage) MarshalJSON() ([]byte, error) {
|
|
if m == nil {
|
|
return []byte("null"), nil
|
|
} else if len(*m) == 0 {
|
|
return []byte("null"), nil
|
|
}
|
|
return *m, nil
|
|
}
|
|
|
|
// UnmarshalJSON sets *m to a copy of data.
|
|
func (m *RawMessage) UnmarshalJSON(data []byte) error {
|
|
if m == nil {
|
|
return errors.New("RawMessage UnmarshalJSON on nil pointer")
|
|
}
|
|
*m = append((*m)[0:0], data...)
|
|
return nil
|
|
}
|