gtsocial-umbx

bind.go (5605B)

---

 package pgproto3
 
 import (
 	"bytes"
 	"encoding/binary"
 	"encoding/hex"
 	"encoding/json"
 	"fmt"
 
 	"github.com/jackc/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 {
 	dst = append(dst, 'B')
 	sp := len(dst)
 	dst = pgio.AppendInt32(dst, -1)
 
 	dst = append(dst, src.DestinationPortal...)
 	dst = append(dst, 0)
 	dst = append(dst, src.PreparedStatement...)
 	dst = append(dst, 0)
 
 	dst = pgio.AppendUint16(dst, uint16(len(src.ParameterFormatCodes)))
 	for _, fc := range src.ParameterFormatCodes {
 		dst = pgio.AppendInt16(dst, fc)
 	}
 
 	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...)
 	}
 
 	dst = pgio.AppendUint16(dst, uint16(len(src.ResultFormatCodes)))
 	for _, fc := range src.ResultFormatCodes {
 		dst = pgio.AppendInt16(dst, fc)
 	}
 
 	pgio.SetInt32(dst[sp:], int32(len(dst[sp:])))
 
 	return dst
 }
 
 // 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
 }