96 lines
2.5 KiB
Go
96 lines
2.5 KiB
Go
package pgproto3
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import (
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"bytes"
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"encoding/binary"
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"encoding/json"
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"errors"
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"math"
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"github.com/jackc/pgx/v5/internal/pgio"
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)
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type CopyBothResponse struct {
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OverallFormat byte
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ColumnFormatCodes []uint16
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}
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// Backend identifies this message as sendable by the PostgreSQL backend.
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func (*CopyBothResponse) Backend() {}
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// Decode decodes src into dst. src must contain the complete message with the exception of the initial 1 byte message
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// type identifier and 4 byte message length.
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func (dst *CopyBothResponse) Decode(src []byte) error {
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buf := bytes.NewBuffer(src)
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if buf.Len() < 3 {
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return &invalidMessageFormatErr{messageType: "CopyBothResponse"}
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}
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overallFormat := buf.Next(1)[0]
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columnCount := int(binary.BigEndian.Uint16(buf.Next(2)))
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if buf.Len() != columnCount*2 {
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return &invalidMessageFormatErr{messageType: "CopyBothResponse"}
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}
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columnFormatCodes := make([]uint16, columnCount)
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for i := 0; i < columnCount; i++ {
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columnFormatCodes[i] = binary.BigEndian.Uint16(buf.Next(2))
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}
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*dst = CopyBothResponse{OverallFormat: overallFormat, ColumnFormatCodes: columnFormatCodes}
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return nil
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}
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// Encode encodes src into dst. dst will include the 1 byte message type identifier and the 4 byte message length.
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func (src *CopyBothResponse) Encode(dst []byte) ([]byte, error) {
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dst, sp := beginMessage(dst, 'W')
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dst = append(dst, src.OverallFormat)
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if len(src.ColumnFormatCodes) > math.MaxUint16 {
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return nil, errors.New("too many column format codes")
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}
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dst = pgio.AppendUint16(dst, uint16(len(src.ColumnFormatCodes)))
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for _, fc := range src.ColumnFormatCodes {
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dst = pgio.AppendUint16(dst, fc)
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}
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return finishMessage(dst, sp)
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}
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// MarshalJSON implements encoding/json.Marshaler.
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func (src CopyBothResponse) MarshalJSON() ([]byte, error) {
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return json.Marshal(struct {
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Type string
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ColumnFormatCodes []uint16
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}{
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Type: "CopyBothResponse",
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ColumnFormatCodes: src.ColumnFormatCodes,
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})
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}
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// UnmarshalJSON implements encoding/json.Unmarshaler.
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func (dst *CopyBothResponse) UnmarshalJSON(data []byte) error {
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// Ignore null, like in the main JSON package.
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if string(data) == "null" {
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return nil
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}
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var msg struct {
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OverallFormat string
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ColumnFormatCodes []uint16
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}
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if err := json.Unmarshal(data, &msg); err != nil {
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return err
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}
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if len(msg.OverallFormat) != 1 {
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return errors.New("invalid length for CopyBothResponse.OverallFormat")
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}
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dst.OverallFormat = msg.OverallFormat[0]
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dst.ColumnFormatCodes = msg.ColumnFormatCodes
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return nil
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}
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