package pgproto3 import ( "bytes" "encoding/json" "errors" "github.com/jackc/pgx/v5/internal/pgio" ) type Close struct { ObjectType byte // 'S' = prepared statement, 'P' = portal Name string } // Frontend identifies this message as sendable by a PostgreSQL frontend. func (*Close) 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 *Close) Decode(src []byte) error { if len(src) < 2 { return &invalidMessageFormatErr{messageType: "Close"} } dst.ObjectType = src[0] rp := 1 idx := bytes.IndexByte(src[rp:], 0) if idx != len(src[rp:])-1 { return &invalidMessageFormatErr{messageType: "Close"} } dst.Name = string(src[rp : len(src)-1]) return nil } // Encode encodes src into dst. dst will include the 1 byte message type identifier and the 4 byte message length. func (src *Close) Encode(dst []byte) []byte { dst = append(dst, 'C') sp := len(dst) dst = pgio.AppendInt32(dst, -1) dst = append(dst, src.ObjectType) dst = append(dst, src.Name...) dst = append(dst, 0) pgio.SetInt32(dst[sp:], int32(len(dst[sp:]))) return dst } // MarshalJSON implements encoding/json.Marshaler. func (src Close) MarshalJSON() ([]byte, error) { return json.Marshal(struct { Type string ObjectType string Name string }{ Type: "Close", ObjectType: string(src.ObjectType), Name: src.Name, }) } // UnmarshalJSON implements encoding/json.Unmarshaler. func (dst *Close) UnmarshalJSON(data []byte) error { // Ignore null, like in the main JSON package. if string(data) == "null" { return nil } var msg struct { ObjectType string Name string } if err := json.Unmarshal(data, &msg); err != nil { return err } if len(msg.ObjectType) != 1 { return errors.New("invalid length for Close.ObjectType") } dst.ObjectType = byte(msg.ObjectType[0]) dst.Name = msg.Name return nil }