go-sandbox/container/socket.go
2020-02-19 05:36:23 -05:00

57 lines
1.2 KiB
Go

package container
import (
"bytes"
"encoding/gob"
"fmt"
"sync"
"github.com/criyle/go-sandbox/pkg/unixsocket"
)
// 16k buffsize
const bufferSize = 16 << 10
var bufferPool = sync.Pool{
New: func() interface{} {
return make([]byte, bufferSize)
},
}
type socket unixsocket.Socket
func (s *socket) RecvMsg(e interface{}) (*unixsocket.Msg, error) {
soc := (*unixsocket.Socket)(s)
buff := bufferPool.Get().([]byte)
defer bufferPool.Put(buff)
n, msg, err := soc.RecvMsg(buff)
if err != nil {
return nil, fmt.Errorf("RecvMsg: %v", err)
}
if err := gob.NewDecoder(bytes.NewReader(buff[:n])).Decode(e); err != nil {
return nil, fmt.Errorf("RecvMsg: failed to decode %w", err)
}
return msg, nil
}
func (s *socket) SendMsg(e interface{}, msg *unixsocket.Msg) error {
soc := (*unixsocket.Socket)(s)
buf := bufferPool.Get().([]byte)
defer bufferPool.Put(buf)
// use buf pool to reduce allocation
buff := bytes.NewBuffer(buf[:0])
if err := gob.NewEncoder(buff).Encode(e); err != nil {
return fmt.Errorf("SendMsg: failed to encode %w", err)
}
if err := soc.SendMsg(buff.Bytes(), msg); err != nil {
return fmt.Errorf("SendMsg: failed to SendMsg %w", err)
}
return nil
}