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codec.go
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codec.go
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package netwrk
import (
"bytes"
"encoding/gob"
"encoding/json"
"github.com/acharapko/fleetdb/log"
)
// Codec interface provide methods for serialization and deserialization
type Codec interface {
Scheme() string
Encode(msg interface{}) []byte
Decode(data []byte) interface{}
}
// NewCodec creates new codec object based on scheme, i.e. json and gob
func NewCodec(scheme string) Codec {
switch scheme {
case "json":
return &jsonCodec{}
case "gob":
return &gobCodec{}
}
return nil
}
type jsonCodec struct{}
func (j *jsonCodec) Scheme() string {
return "json"
}
func (j *jsonCodec) Encode(msg interface{}) []byte {
b, err := json.Marshal(msg)
if err != nil {
log.Errorln(err)
return nil
}
return b
}
func (j *jsonCodec) Decode(data []byte) interface{} {
var msg interface{}
err := json.Unmarshal(data, &msg)
if err != nil {
log.Errorln(err)
return nil
}
return msg
}
type gobCodec struct{}
func (g *gobCodec) Scheme() string {
return "gob"
}
func (g *gobCodec) Encode(msg interface{}) []byte {
buffer := new(bytes.Buffer)
encoder := gob.NewEncoder(buffer)
err := encoder.Encode(&msg)
if err != nil {
log.Fatalln(err)
}
return buffer.Bytes()
}
func (g *gobCodec) Decode(data []byte) interface{} {
var msg interface{}
buffer := bytes.NewBuffer(data)
decoder := gob.NewDecoder(buffer)
err := decoder.Decode(&msg)
if err != nil {
log.Fatalln(err)
}
return msg
}