Ejemplo n.º 1
0
func (a *SellActivity) dispatchWorkAndSaveEncryptedResult(log bitwrk.Logger, workFile cafs.File) error {
	// Watch transaction state and close connection to worker when transaction expires
	connChan := make(chan io.Closer)
	exitChan := make(chan bool)
	go a.watchdog(log, exitChan, connChan, func() bool { return a.tx.State == bitwrk.StateActive })
	defer func() {
		exitChan <- true
	}()

	st := NewScopedTransport()
	connChan <- st
	defer st.Close()

	reader := workFile.Open()
	defer reader.Close()
	result, err := a.worker.DoWork(reader, NewClient(&st.Transport))
	if err != nil {
		return err
	}
	defer result.Close()

	temp := a.manager.storage.Create(fmt.Sprintf("Sell #%v: encrypted result", a.GetKey()))
	defer temp.Dispose()

	// Use AES-256 to encrypt the result
	block, err := aes.NewCipher(a.encResultKey[:])
	if err != nil {
		return err
	}

	// Create OFB stream with null initialization vector (ok for one-time key)
	var iv [aes.BlockSize]byte
	stream := cipher.NewOFB(block, iv[:])

	writer := &cipher.StreamWriter{S: stream, W: temp}
	_, err = io.Copy(writer, result)
	if err != nil {
		return err
	}

	if err := temp.Close(); err != nil {
		return err
	}

	if err := result.Close(); err != nil {
		return err
	}

	a.execSync(func() { a.encResultFile = temp.File() })

	return nil
}
Ejemplo n.º 2
0
func (a *SellActivity) dispatchWork(log bitwrk.Logger, workFile cafs.File) (io.ReadCloser, error) {
	// Watch transaction state and close connection to worker when transaction expires
	connChan := make(chan io.Closer)
	exitChan := make(chan bool)
	go a.watchdog(log, exitChan, connChan, func() bool { return a.tx.State == bitwrk.StateActive })
	defer func() {
		exitChan <- true
	}()

	reader := workFile.Open()
	defer reader.Close()

	st := NewScopedTransport()
	connChan <- st
	defer st.Close()
	r, err := a.worker.DoWork(reader, NewClient(&st.Transport))
	if err == nil {
		// Defuse connection closing mechanism
		st.DisownConnections()
	}
	return r, err
}