mirror of https://github.com/jackc/pgx.git
61 lines
1.1 KiB
Go
61 lines
1.1 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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)
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type Describe struct {
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ObjectType byte // 'S' = prepared statement, 'P' = portal
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Name string
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}
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func (*Describe) Frontend() {}
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func (dst *Describe) Decode(src []byte) error {
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if len(src) < 2 {
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return &invalidMessageFormatErr{messageType: "Describe"}
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}
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dst.ObjectType = src[0]
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rp := 1
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idx := bytes.IndexByte(src[rp:], 0)
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if idx != len(src[rp:])-1 {
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return &invalidMessageFormatErr{messageType: "Describe"}
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}
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dst.Name = string(src[rp : len(src)-1])
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return nil
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}
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func (src *Describe) MarshalBinary() ([]byte, error) {
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var bigEndian BigEndianBuf
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buf := &bytes.Buffer{}
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buf.WriteByte('D')
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buf.Write(bigEndian.Uint32(0))
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buf.WriteByte(src.ObjectType)
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buf.WriteString(src.Name)
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buf.WriteByte(0)
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binary.BigEndian.PutUint32(buf.Bytes()[1:5], uint32(buf.Len()-1))
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return buf.Bytes(), nil
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}
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func (src *Describe) MarshalJSON() ([]byte, error) {
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return json.Marshal(struct {
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Type string
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ObjectType string
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Name string
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}{
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Type: "Describe",
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ObjectType: string(src.ObjectType),
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Name: src.Name,
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})
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}
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