package pgproto3 import ( "encoding/hex" "encoding/json" "github.com/jackc/pgio" ) type CopyData struct { Data []byte } // 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 { 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 { 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 }