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package pgproto3
import (
"bytes"
"encoding/binary"
"encoding/hex"
"encoding/json"
"errors"
"fmt"
"math"
"github.com/jackc/pgx/v5/internal/pgio"
)
type Bind struct {
DestinationPortal string
PreparedStatement string
ParameterFormatCodes []int16
Parameters [][]byte
ResultFormatCodes []int16
}
// Frontend identifies this message as sendable by a PostgreSQL frontend.
func (*Bind) 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 *Bind) Decode(src []byte) error {
*dst = Bind{}
idx := bytes.IndexByte(src, 0)
if idx < 0 {
return &invalidMessageFormatErr{messageType: "Bind"}
}
dst.DestinationPortal = string(src[:idx])
rp := idx + 1
idx = bytes.IndexByte(src[rp:], 0)
if idx < 0 {
return &invalidMessageFormatErr{messageType: "Bind"}
}
dst.PreparedStatement = string(src[rp : rp+idx])
rp += idx + 1
if len(src[rp:]) < 2 {
return &invalidMessageFormatErr{messageType: "Bind"}
}
parameterFormatCodeCount := int(binary.BigEndian.Uint16(src[rp:]))
rp += 2
if parameterFormatCodeCount > 0 {
dst.ParameterFormatCodes = make([]int16, parameterFormatCodeCount)
if len(src[rp:]) < len(dst.ParameterFormatCodes)*2 {
return &invalidMessageFormatErr{messageType: "Bind"}
}
for i := 0; i < parameterFormatCodeCount; i++ {
dst.ParameterFormatCodes[i] = int16(binary.BigEndian.Uint16(src[rp:]))
rp += 2
}
}
if len(src[rp:]) < 2 {
return &invalidMessageFormatErr{messageType: "Bind"}
}
parameterCount := int(binary.BigEndian.Uint16(src[rp:]))
rp += 2
if parameterCount > 0 {
dst.Parameters = make([][]byte, parameterCount)
for i := 0; i < parameterCount; i++ {
if len(src[rp:]) < 4 {
return &invalidMessageFormatErr{messageType: "Bind"}
}
msgSize := int(int32(binary.BigEndian.Uint32(src[rp:])))
rp += 4
// null
if msgSize == -1 {
continue
}
if len(src[rp:]) < msgSize {
return &invalidMessageFormatErr{messageType: "Bind"}
}
dst.Parameters[i] = src[rp : rp+msgSize]
rp += msgSize
}
}
if len(src[rp:]) < 2 {
return &invalidMessageFormatErr{messageType: "Bind"}
}
resultFormatCodeCount := int(binary.BigEndian.Uint16(src[rp:]))
rp += 2
dst.ResultFormatCodes = make([]int16, resultFormatCodeCount)
if len(src[rp:]) < len(dst.ResultFormatCodes)*2 {
return &invalidMessageFormatErr{messageType: "Bind"}
}
for i := 0; i < resultFormatCodeCount; i++ {
dst.ResultFormatCodes[i] = int16(binary.BigEndian.Uint16(src[rp:]))
rp += 2
}
return nil
}
// Encode encodes src into dst. dst will include the 1 byte message type identifier and the 4 byte message length.
func (src *Bind) Encode(dst []byte) ([]byte, error) {
dst, sp := beginMessage(dst, 'B')
dst = append(dst, src.DestinationPortal...)
dst = append(dst, 0)
dst = append(dst, src.PreparedStatement...)
dst = append(dst, 0)
if len(src.ParameterFormatCodes) > math.MaxUint16 {
return nil, errors.New("too many parameter format codes")
}
dst = pgio.AppendUint16(dst, uint16(len(src.ParameterFormatCodes)))
for _, fc := range src.ParameterFormatCodes {
dst = pgio.AppendInt16(dst, fc)
}
if len(src.Parameters) > math.MaxUint16 {
return nil, errors.New("too many parameters")
}
dst = pgio.AppendUint16(dst, uint16(len(src.Parameters)))
for _, p := range src.Parameters {
if p == nil {
dst = pgio.AppendInt32(dst, -1)
continue
}
dst = pgio.AppendInt32(dst, int32(len(p)))
dst = append(dst, p...)
}
if len(src.ResultFormatCodes) > math.MaxUint16 {
return nil, errors.New("too many result format codes")
}
dst = pgio.AppendUint16(dst, uint16(len(src.ResultFormatCodes)))
for _, fc := range src.ResultFormatCodes {
dst = pgio.AppendInt16(dst, fc)
}
return finishMessage(dst, sp)
}
// MarshalJSON implements encoding/json.Marshaler.
func (src Bind) MarshalJSON() ([]byte, error) {
formattedParameters := make([]map[string]string, len(src.Parameters))
for i, p := range src.Parameters {
if p == nil {
continue
}
textFormat := true
if len(src.ParameterFormatCodes) == 1 {
textFormat = src.ParameterFormatCodes[0] == 0
} else if len(src.ParameterFormatCodes) > 1 {
textFormat = src.ParameterFormatCodes[i] == 0
}
if textFormat {
formattedParameters[i] = map[string]string{"text": string(p)}
} else {
formattedParameters[i] = map[string]string{"binary": hex.EncodeToString(p)}
}
}
return json.Marshal(struct {
Type string
DestinationPortal string
PreparedStatement string
ParameterFormatCodes []int16
Parameters []map[string]string
ResultFormatCodes []int16
}{
Type: "Bind",
DestinationPortal: src.DestinationPortal,
PreparedStatement: src.PreparedStatement,
ParameterFormatCodes: src.ParameterFormatCodes,
Parameters: formattedParameters,
ResultFormatCodes: src.ResultFormatCodes,
})
}
// UnmarshalJSON implements encoding/json.Unmarshaler.
func (dst *Bind) UnmarshalJSON(data []byte) error {
// Ignore null, like in the main JSON package.
if string(data) == "null" {
return nil
}
var msg struct {
DestinationPortal string
PreparedStatement string
ParameterFormatCodes []int16
Parameters []map[string]string
ResultFormatCodes []int16
}
err := json.Unmarshal(data, &msg)
if err != nil {
return err
}
dst.DestinationPortal = msg.DestinationPortal
dst.PreparedStatement = msg.PreparedStatement
dst.ParameterFormatCodes = msg.ParameterFormatCodes
dst.Parameters = make([][]byte, len(msg.Parameters))
dst.ResultFormatCodes = msg.ResultFormatCodes
for n, parameter := range msg.Parameters {
dst.Parameters[n], err = getValueFromJSON(parameter)
if err != nil {
return fmt.Errorf("cannot get param %d: %w", n, err)
}
}
return nil
}
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