mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2024-12-05 01:52:46 +00:00
97 lines
2.3 KiB
Go
97 lines
2.3 KiB
Go
|
package pgproto3
|
||
|
|
||
|
import (
|
||
|
"bytes"
|
||
|
"encoding/binary"
|
||
|
"encoding/json"
|
||
|
"errors"
|
||
|
"fmt"
|
||
|
|
||
|
"github.com/jackc/pgx/v5/internal/pgio"
|
||
|
)
|
||
|
|
||
|
const ProtocolVersionNumber = 196608 // 3.0
|
||
|
|
||
|
type StartupMessage struct {
|
||
|
ProtocolVersion uint32
|
||
|
Parameters map[string]string
|
||
|
}
|
||
|
|
||
|
// Frontend identifies this message as sendable by a PostgreSQL frontend.
|
||
|
func (*StartupMessage) 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 *StartupMessage) Decode(src []byte) error {
|
||
|
if len(src) < 4 {
|
||
|
return errors.New("startup message too short")
|
||
|
}
|
||
|
|
||
|
dst.ProtocolVersion = binary.BigEndian.Uint32(src)
|
||
|
rp := 4
|
||
|
|
||
|
if dst.ProtocolVersion != ProtocolVersionNumber {
|
||
|
return fmt.Errorf("Bad startup message version number. Expected %d, got %d", ProtocolVersionNumber, dst.ProtocolVersion)
|
||
|
}
|
||
|
|
||
|
dst.Parameters = make(map[string]string)
|
||
|
for {
|
||
|
idx := bytes.IndexByte(src[rp:], 0)
|
||
|
if idx < 0 {
|
||
|
return &invalidMessageFormatErr{messageType: "StartupMesage"}
|
||
|
}
|
||
|
key := string(src[rp : rp+idx])
|
||
|
rp += idx + 1
|
||
|
|
||
|
idx = bytes.IndexByte(src[rp:], 0)
|
||
|
if idx < 0 {
|
||
|
return &invalidMessageFormatErr{messageType: "StartupMesage"}
|
||
|
}
|
||
|
value := string(src[rp : rp+idx])
|
||
|
rp += idx + 1
|
||
|
|
||
|
dst.Parameters[key] = value
|
||
|
|
||
|
if len(src[rp:]) == 1 {
|
||
|
if src[rp] != 0 {
|
||
|
return fmt.Errorf("Bad startup message last byte. Expected 0, got %d", src[rp])
|
||
|
}
|
||
|
break
|
||
|
}
|
||
|
}
|
||
|
|
||
|
return nil
|
||
|
}
|
||
|
|
||
|
// Encode encodes src into dst. dst will include the 1 byte message type identifier and the 4 byte message length.
|
||
|
func (src *StartupMessage) Encode(dst []byte) []byte {
|
||
|
sp := len(dst)
|
||
|
dst = pgio.AppendInt32(dst, -1)
|
||
|
|
||
|
dst = pgio.AppendUint32(dst, src.ProtocolVersion)
|
||
|
for k, v := range src.Parameters {
|
||
|
dst = append(dst, k...)
|
||
|
dst = append(dst, 0)
|
||
|
dst = append(dst, v...)
|
||
|
dst = append(dst, 0)
|
||
|
}
|
||
|
dst = append(dst, 0)
|
||
|
|
||
|
pgio.SetInt32(dst[sp:], int32(len(dst[sp:])))
|
||
|
|
||
|
return dst
|
||
|
}
|
||
|
|
||
|
// MarshalJSON implements encoding/json.Marshaler.
|
||
|
func (src StartupMessage) MarshalJSON() ([]byte, error) {
|
||
|
return json.Marshal(struct {
|
||
|
Type string
|
||
|
ProtocolVersion uint32
|
||
|
Parameters map[string]string
|
||
|
}{
|
||
|
Type: "StartupMessage",
|
||
|
ProtocolVersion: src.ProtocolVersion,
|
||
|
Parameters: src.Parameters,
|
||
|
})
|
||
|
}
|