90 lines
2.0 KiB
Go
90 lines
2.0 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 Parse struct {
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Name string
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Query string
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ParameterOIDs []uint32
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}
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// Frontend identifies this message as sendable by a PostgreSQL frontend.
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func (*Parse) Frontend() {}
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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 *Parse) Decode(src []byte) error {
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*dst = Parse{}
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buf := bytes.NewBuffer(src)
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b, err := buf.ReadBytes(0)
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if err != nil {
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return err
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}
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dst.Name = string(b[:len(b)-1])
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b, err = buf.ReadBytes(0)
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if err != nil {
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return err
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}
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dst.Query = string(b[:len(b)-1])
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if buf.Len() < 2 {
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return &invalidMessageFormatErr{messageType: "Parse"}
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}
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parameterOIDCount := int(binary.BigEndian.Uint16(buf.Next(2)))
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for i := 0; i < parameterOIDCount; i++ {
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if buf.Len() < 4 {
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return &invalidMessageFormatErr{messageType: "Parse"}
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}
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dst.ParameterOIDs = append(dst.ParameterOIDs, binary.BigEndian.Uint32(buf.Next(4)))
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}
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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 *Parse) Encode(dst []byte) ([]byte, error) {
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dst, sp := beginMessage(dst, 'P')
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dst = append(dst, src.Name...)
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dst = append(dst, 0)
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dst = append(dst, src.Query...)
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dst = append(dst, 0)
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if len(src.ParameterOIDs) > math.MaxUint16 {
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return nil, errors.New("too many parameter oids")
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}
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dst = pgio.AppendUint16(dst, uint16(len(src.ParameterOIDs)))
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for _, oid := range src.ParameterOIDs {
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dst = pgio.AppendUint32(dst, oid)
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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 Parse) MarshalJSON() ([]byte, error) {
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return json.Marshal(struct {
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Type string
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Name string
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Query string
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ParameterOIDs []uint32
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}{
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Type: "Parse",
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Name: src.Name,
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Query: src.Query,
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ParameterOIDs: src.ParameterOIDs,
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})
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}
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