GOLANG使用Context实现传值、超时和取消的方法

type Packet interface {
  encoding.BinaryMarshaler
  encoding.BinaryUnmarshaler
}

type Stack struct {
}
func (v *Stack) Read(ctx context.Context) (pkt Packet, err error) {
  return
}

ctx,cancel := context.WithCancel(context.Background())
stack := &Stack{}
pkt,err := stack.Read(ctx)

sc := make(chan os.Signal, 0)
signal.Notify(sc, syscall.SIGINT, syscall.SIGTERM)
go func() {
  for range sc {
    cancel()
  }
}()

ctx,cancel := context.WithTimeout(context.Background(), 3*time.Second)
defer cancel()
pkt,err := stack.Read(ctx)

func (v *Stack) Read(ctx context.Context) (pkt Packet, err error) {
  select {
  // case <- dataChannel: // Parse packet from data channel.
  case <- ctx.Done():
    return nil,ctx.Err()
  }
  return
}