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wrapper.go
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/
wrapper.go
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package data
import (
"encoding"
"encoding/json"
"github.com/pkg/errors"
)
type MessageType string
const (
MessageTypeEmpty MessageType = "empty"
MessageTypeChange MessageType = "change"
MessageTypeChangeDigest MessageType = "change_digest"
MessageTypeRequestRegister MessageType = "request_register"
MessageTypeRequestAcknowledge MessageType = "request_acknowledge"
MessageTypeResponseRegister MessageType = "response_register"
MessageTypeResponseAcknowledge MessageType = "response_acknowledge"
)
type Empty struct{}
func (e *Empty) Type() MessageType {
return MessageTypeEmpty
}
func (e *Empty) MarshalBinary() ([]byte, error) {
return json.Marshal(e)
}
type Wrapper struct {
Type MessageType `json:"type"`
Bytes []byte `json:"bytes"`
}
func (w *Wrapper) MarshalBinary() ([]byte, error) {
return json.Marshal(w)
}
type Wrappable interface {
Type() MessageType
encoding.BinaryMarshaler
}
func ToWrapper(message Wrappable) *Wrapper {
bytes, _ := message.MarshalBinary()
return &Wrapper{
Type: message.Type(),
Bytes: bytes,
}
}
func FromWrapper(wrapper *Wrapper) (interface{}, error) {
if wrapper == nil {
return nil, errors.New("wrapper is nil")
}
switch wrapper.Type {
case MessageTypeEmpty:
return nil, nil
case MessageTypeChange:
change := &Change{}
if err := change.UnmarshalBinary(wrapper.Bytes); err != nil {
return nil, err
}
return change, nil
case MessageTypeChangeDigest:
changeDigest := &ChangeDigest{}
if err := changeDigest.UnmarshalBinary(wrapper.Bytes); err != nil {
return nil, err
}
return changeDigest, nil
case MessageTypeRequestAcknowledge:
request := &RequestAcknowledge{}
if err := request.UnmarshalBinary(wrapper.Bytes); err != nil {
return nil, err
}
return request, nil
case MessageTypeRequestRegister:
request := &RequestRegister{}
if err := request.UnmarshalBinary(wrapper.Bytes); err != nil {
return nil, err
}
return request, nil
case MessageTypeResponseRegister:
response := &ResponseRegister{}
if err := response.UnmarshalBinary(wrapper.Bytes); err != nil {
return nil, err
}
return response, nil
case MessageTypeResponseAcknowledge:
response := &ResponseAcknowledge{}
if err := response.UnmarshalBinary(wrapper.Bytes); err != nil {
return nil, err
}
return response, nil
}
return nil, errors.Errorf("unsupported type: %s", wrapper.Type)
}