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package pgproto3
import (
"encoding/binary"
"encoding/hex"
"encoding/json"
"github.com/jackc/pgx/v5/internal/pgio"
)
type FunctionCallResponse struct {
Result []byte
}
// Backend identifies this message as sendable by the PostgreSQL backend.
func (*FunctionCallResponse) Backend() {}
// 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 *FunctionCallResponse) Decode(src []byte) error {
if len(src) < 4 {
return &invalidMessageFormatErr{messageType: "FunctionCallResponse"}
}
rp := 0
resultSize := int(binary.BigEndian.Uint32(src[rp:]))
rp += 4
if resultSize == -1 {
dst.Result = nil
return nil
}
if len(src[rp:]) != resultSize {
return &invalidMessageFormatErr{messageType: "FunctionCallResponse"}
}
dst.Result = src[rp:]
return nil
}
// Encode encodes src into dst. dst will include the 1 byte message type identifier and the 4 byte message length.
func (src *FunctionCallResponse) Encode(dst []byte) []byte {
dst = append(dst, 'V')
sp := len(dst)
dst = pgio.AppendInt32(dst, -1)
if src.Result == nil {
dst = pgio.AppendInt32(dst, -1)
} else {
dst = pgio.AppendInt32(dst, int32(len(src.Result)))
dst = append(dst, src.Result...)
}
pgio.SetInt32(dst[sp:], int32(len(dst[sp:])))
return dst
}
// MarshalJSON implements encoding/json.Marshaler.
func (src FunctionCallResponse) MarshalJSON() ([]byte, error) {
var formattedValue map[string]string
var hasNonPrintable bool
for _, b := range src.Result {
if b < 32 {
hasNonPrintable = true
break
}
}
if hasNonPrintable {
formattedValue = map[string]string{"binary": hex.EncodeToString(src.Result)}
} else {
formattedValue = map[string]string{"text": string(src.Result)}
}
return json.Marshal(struct {
Type string
Result map[string]string
}{
Type: "FunctionCallResponse",
Result: formattedValue,
})
}
// UnmarshalJSON implements encoding/json.Unmarshaler.
func (dst *FunctionCallResponse) UnmarshalJSON(data []byte) error {
// Ignore null, like in the main JSON package.
if string(data) == "null" {
return nil
}
var msg struct {
Result map[string]string
}
err := json.Unmarshal(data, &msg)
if err != nil {
return err
}
dst.Result, err = getValueFromJSON(msg.Result)
return err
}
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