copy_data.go

package pgproto3

import (
	"github.com/jackc/pgio"
)

type CopyData struct {
	Data []byte `json:"data" yaml:"data"`
}

// Backend identifies this message as sendable by the PostgreSQL backend.
func (*CopyData) Backend() {}

// Frontend identifies this message as sendable by a PostgreSQL frontend.
func (*CopyData) Frontend() {}

// Decode decodes src into dst. src must contain the complete message with the exception of the initial 1 byte message
// type identifier and 4 byte message length.
func (dst *CopyData) Decode(src []byte) error {
	//println("CopyData.Decode")
	dst.Data = src
	return nil
}

// Encode encodes src into dst. dst will include the 1 byte message type identifier and the 4 byte message length.
func (src *CopyData) Encode(dst []byte) []byte {
	//println("CopyData.Encode")
	dst = append(dst, 'd')
	dst = pgio.AppendInt32(dst, int32(4+len(src.Data)))
	dst = append(dst, src.Data...)
	return dst
}

// // MarshalJSON implements encoding/json.Marshaler.
// func (src CopyData) MarshalJSON() ([]byte, error) {
// 	return json.Marshal(struct {
// 		Type string
// 		Data string
// 	}{
// 		Type: "CopyData",
// 		Data: hex.EncodeToString(src.Data),
// 	})
// }

// // UnmarshalJSON implements encoding/json.Unmarshaler.
// func (dst *CopyData) UnmarshalJSON(data []byte) error {
// 	// Ignore null, like in the main JSON package.
// 	if string(data) == "null" {
// 		return nil
// 	}

// 	var msg struct {
// 		Data string
// 	}
// 	if err := json.Unmarshal(data, &msg); err != nil {
// 		return err
// 	}

// 	dst.Data = []byte(msg.Data)
// 	return nil
// }