Ejemplo n.º 1
0
func RandTestBogusPrivateKey() (TestBogusPrivateKey, error) {
	r := u.NewTimeSeededRand()
	k := make([]byte, 5)
	if _, err := io.ReadFull(r, k); err != nil {
		return nil, err
	}
	return TestBogusPrivateKey(k), nil
}
Ejemplo n.º 2
0
func newSender() (chan sendChans, func(s inet.Stream)) {
	scc := make(chan sendChans)
	return scc, func(s inet.Stream) {
		sc := newSendChans()
		scc <- sc

		defer func() {
			s.Close()
			sc.closed <- struct{}{}
		}()

		buf := make([]byte, 65536)
		buf2 := make([]byte, 65536)
		u.NewTimeSeededRand().Read(buf)

		for {
			select {
			case <-sc.close_:
				return
			case <-sc.send:
			}

			// send a randomly sized subchunk
			from := rand.Intn(len(buf) / 2)
			to := rand.Intn(len(buf) / 2)
			sendbuf := buf[from : from+to]

			log.Debugf("sender sending %d bytes", len(sendbuf))
			n, err := s.Write(sendbuf)
			if err != nil {
				log.Debug("sender error. exiting:", err)
				return
			}

			log.Debugf("sender wrote %d bytes", n)
			sc.sent <- struct{}{}

			if n, err = io.ReadFull(s, buf2[:len(sendbuf)]); err != nil {
				log.Debug("sender error. failed to read:", err)
				return
			}

			log.Debugf("sender read %d bytes", n)
			sc.read <- struct{}{}
		}
	}
}
Ejemplo n.º 3
0
func ping(s inet.Stream) (time.Duration, error) {
	buf := make([]byte, PingSize)
	u.NewTimeSeededRand().Read(buf)

	before := time.Now()
	_, err := s.Write(buf)
	if err != nil {
		return 0, err
	}

	rbuf := make([]byte, PingSize)
	_, err = io.ReadFull(s, rbuf)
	if err != nil {
		return 0, err
	}

	if !bytes.Equal(buf, rbuf) {
		return 0, errors.New("ping packet was incorrect!")
	}

	return time.Since(before), nil
}
Ejemplo n.º 4
0
// TestStBackpressureStreamWrite tests whether streams see proper
// backpressure when writing data over the network streams.
func TestStBackpressureStreamWrite(t *testing.T) {

	// senderWrote signals that the sender wrote bytes to remote.
	// the value is the count of bytes written.
	senderWrote := make(chan int, 10000)

	// sender signals it's done (errored out)
	senderDone := make(chan struct{})

	// writeStats lets us listen to all the writes and return
	// how many happened and how much was written
	writeStats := func() (int, int) {
		writes := 0
		bytes := 0
		for {
			select {
			case n := <-senderWrote:
				writes++
				bytes = bytes + n
			default:
				log.Debugf("stats: sender wrote %d bytes, %d writes", bytes, writes)
				return bytes, writes
			}
		}
	}

	// sender attempts to write as fast as possible, signaling on the
	// completion of every write. This makes it possible to see how
	// fast it's actually writing. We pair this with a receiver
	// that waits for a signal to read.
	sender := func(s inet.Stream) {
		defer func() {
			s.Close()
			senderDone <- struct{}{}
		}()

		// ready a buffer of random data
		buf := make([]byte, 65536)
		u.NewTimeSeededRand().Read(buf)

		for {
			// send a randomly sized subchunk
			from := rand.Intn(len(buf) / 2)
			to := rand.Intn(len(buf) / 2)
			sendbuf := buf[from : from+to]

			n, err := s.Write(sendbuf)
			if err != nil {
				log.Debug("sender error. exiting:", err)
				return
			}

			log.Debugf("sender wrote %d bytes", n)
			senderWrote <- n
		}
	}

	// receive a number of bytes from a stream.
	// returns the number of bytes written.
	receive := func(s inet.Stream, expect int) {
		log.Debugf("receiver to read %d bytes", expect)
		rbuf := make([]byte, expect)
		n, err := io.ReadFull(s, rbuf)
		if err != nil {
			t.Error("read failed:", err)
		}
		if expect != n {
			t.Error("read len differs: %d != %d", expect, n)
		}
	}

	// ok let's do it!

	// setup the networks
	ctx := context.Background()
	h1 := testutil.GenHostSwarm(t, ctx)
	h2 := testutil.GenHostSwarm(t, ctx)

	// setup sender handler on 1
	h1.SetStreamHandler(protocol.TestingID, sender)

	h2pi := h2.Peerstore().PeerInfo(h2.ID())
	log.Debugf("dialing %s", h2pi.Addrs)
	if err := h1.Connect(ctx, h2pi); err != nil {
		t.Fatalf("Failed to connect:", err)
	}

	// open a stream, from 2->1, this is our reader
	s, err := h2.NewStream(context.Background(), h1.ID(), protocol.TestingID)
	if err != nil {
		t.Fatal(err)
	}

	// let's make sure r/w works.
	testSenderWrote := func(bytesE int) {
		bytesA, writesA := writeStats()
		if bytesA != bytesE {
			t.Errorf("numbers failed: %d =?= %d bytes, via %d writes", bytesA, bytesE, writesA)
		}
	}

	// trigger lazy connection handshaking
	_, err = s.Read(nil)
	if err != nil {
		t.Fatal(err)
	}

	// 500ms rounds of lockstep write + drain
	roundsStart := time.Now()
	roundsTotal := 0
	for roundsTotal < (2 << 20) {
		// let the sender fill its buffers, it will stop sending.
		<-time.After(300 * time.Millisecond)
		b, _ := writeStats()
		testSenderWrote(0)
		testSenderWrote(0)

		// drain it all, wait again
		receive(s, b)
		roundsTotal = roundsTotal + b
	}
	roundsTime := time.Since(roundsStart)

	// now read continously, while we measure stats.
	stop := make(chan struct{})
	contStart := time.Now()

	go func() {
		for {
			select {
			case <-stop:
				return
			default:
				receive(s, 2<<15)
			}
		}
	}()

	contTotal := 0
	for contTotal < (2 << 20) {
		n := <-senderWrote
		contTotal += n
	}
	stop <- struct{}{}
	contTime := time.Since(contStart)

	// now compare! continuous should've been faster AND larger
	if roundsTime < contTime {
		t.Error("continuous should have been faster")
	}

	if roundsTotal < contTotal {
		t.Error("continuous should have been larger, too!")
	}

	// and a couple rounds more for good measure ;)
	for i := 0; i < 3; i++ {
		// let the sender fill its buffers, it will stop sending.
		<-time.After(300 * time.Millisecond)
		b, _ := writeStats()
		testSenderWrote(0)
		testSenderWrote(0)

		// drain it all, wait again
		receive(s, b)
	}

	// this doesn't work :(:
	// // now for the sugar on top: let's tear down the receiver. it should
	// // exit the sender.
	// n1.Close()
	// testSenderWrote(0)
	// testSenderWrote(0)
	// select {
	// case <-time.After(2 * time.Second):
	// 	t.Error("receiver shutdown failed to exit sender")
	// case <-senderDone:
	// 	log.Info("handler backpressure works!")
	// }
}