go-sandbox/container/socket_linux.go

70 lines
1.3 KiB
Go

package container
import (
"bytes"
"encoding/gob"
"fmt"
"github.com/criyle/go-sandbox/pkg/unixsocket"
)
// 16k buffer size
const bufferSize = 16 << 10
type socket struct {
*unixsocket.Socket
buff []byte
decoder *gob.Decoder
recvBuff bufferRotator
encoder *gob.Encoder
sendBuff bytes.Buffer
}
// bufferRotator replace the underlying Buffers to avoid allocation
type bufferRotator struct {
*bytes.Buffer
}
func (b *bufferRotator) Rotate(buffer *bytes.Buffer) {
b.Buffer = buffer
}
func newSocket(s *unixsocket.Socket) *socket {
soc := socket{
Socket: s,
}
soc.buff = make([]byte, bufferSize)
soc.decoder = gob.NewDecoder(&soc.recvBuff)
soc.encoder = gob.NewEncoder(&soc.sendBuff)
return &soc
}
func (s *socket) RecvMsg(e any) (msg unixsocket.Msg, err error) {
n, msg, err := s.Socket.RecvMsg(s.buff)
if err != nil {
return msg, fmt.Errorf("recv msg: %w", err)
}
s.recvBuff.Rotate(bytes.NewBuffer(s.buff[:n]))
if err := s.decoder.Decode(e); err != nil {
return msg, fmt.Errorf("recv msg: decode: %w", err)
}
return msg, nil
}
func (s *socket) SendMsg(e any, msg unixsocket.Msg) error {
s.sendBuff.Reset()
if err := s.encoder.Encode(e); err != nil {
return fmt.Errorf("send msg: encode: %w", err)
}
if err := s.Socket.SendMsg(s.sendBuff.Bytes(), msg); err != nil {
return fmt.Errorf("send msg: %w", err)
}
return nil
}