func TestBuffer(t *testing.T) {
	bfr := NewBuffer(trace.NewFrame("TestBuffer"), 2)
	bfr.Write(testSeqNo(0))
	bfr.Write(testSeqNo(1))
	bfr.Remove(1)
	bfr.Write(testSeqNo(2))
	bfr.Seek(SeqNo(1))
	// Read 1
	chunk, seqno, err := bfr.Read()
	if err != nil {
		t.Fatalf("read (%s) or bad seqno", err)
	}
	if chunk != testSeqNo(1) || seqno != SeqNo(1) {
		t.Fatalf("chunk=%d seqno=%d; expecting %d", chunk, seqno, 1)
	}
	// Read 2
	chunk, seqno, err = bfr.Read()
	if err != nil {
		t.Fatalf("read (%s)", err)
	}
	if chunk != testSeqNo(2) || seqno != SeqNo(2) {
		t.Fatalf("chunk=%d seqno=%d; expecting %d", chunk, seqno, 2)
	}
	bfr.Remove(2)
	bfr.Close()
	if _, _, err := bfr.Read(); err != io.EOF {
		t.Fatalf("u (%s)", err)
	}
}
func TestHalfConn(t *testing.T) {
	ready := make(chan int)
	f := trace.NewFrame("TestHalfConn")
	p, q := NewPipe(f.Refine("@r"), f.Refine("@w"), Addr("@r"), Addr("@w"))
	// Read goroutine
	go func() {
		defer func() {
			close(ready)
		}()
		b, err := ioutil.ReadAll(q)
		if err != nil {
			log.Printf("read all (%s)", err)
			t.Fatalf("read all (%s)", err)
		}
		if len(b) != N {
			t.Fatalf("bad length")
		}
		for i := 0; i < N; i++ {
			if b[i] != byte(i) {
				t.Fatalf("unexpected byte @%d", i)
			}
		}
	}()
	// Write logic
	for i := 0; i < N; i++ {
		if n, err := p.Write([]byte{byte(i)}); err != nil || n != 1 {
			t.Fatalf("write %d (%v)", n, err)
		}
	}
	if err := p.Close(); err != nil {
		t.Fatalf("close (%s)", err)
	}
	<-ready
}
func TestConnOverTCP(t *testing.T) {
	frame := trace.NewFrame()
	x0 := tcp.Transport
	x1 := NewTransport(frame.Refine("faith"), chain.NewTransport(frame.Refine("chain"), x0))

	ready := make(chan int, 2)
	sent, recv := make(map[byte]struct{}), make(map[byte]struct{})

	// Accepter endpoint
	go func() {
		l := x1.Listen(tcp.Addr(":17222"))
		ready <- 1 // SYNC: Notify that listener is accepting
		testGreedyRead(t, l.Accept(), recv)
		ready <- 1
	}()

	// Dialer endpoint
	<-ready // SYNC: Wait for listener to start accepting
	conn := x1.Dial(tcp.Addr("localhost:17222"))
	testGreedyWrite(t, conn, sent)
	<-ready // SYNC: Wait for accepter goroutine to complete

	// Make sure all marked writes have been received
	if !reflect.DeepEqual(sent, recv) {
		t.Errorf("expected %#v, got %#v", sent, recv)
		failNow()
	}
}
Example #4
0
func TestCodec(t *testing.T) {

	// Transport
	f := trace.NewFrame()
	// Carrier
	sx := sandbox.NewUnreliableTransport(f.Refine("sandbox"), 5, 0, time.Second/3, time.Second/3)
	// Chain
	hx := chain.NewTransport(f.Refine("chain"), sx)
	// Faithful
	fx := faithful.NewTransport(f.Refine("faithful"), hx)
	// Codec
	cx := codec.NewTransport(fx, codec.GobCodec{})
	// Blend
	bx := NewTransport(f.Refine("blend"), cx)

	// Sync
	ya, yb := make(chan int), make(chan int)

	// Accepter
	l := bx.Listen(sandbox.Addr("@"))
	for i := 0; i < testN; i++ {
		go testAcceptConn(t, l, ya, yb)
	}

	// Dialer
	for i := 0; i < testN; i++ {
		go testDialConn(t, bx, ya, yb)
	}
	for i := 0; i < testN; i++ {
		<-yb
	}
}
Example #5
0
func (l listener) Accept() (net.Conn, error) {
	c, err := l.Listener.Accept()
	if err != nil {
		return nil, err
	}
	return &conn{trace.NewFrame("tcp", "acpt"), c}, nil
}
func TestReliable(t *testing.T) {

	sandbox := NewReliableTransport(trace.NewFrame("TestReliable"))
	ready := make(chan int)

	go func() {
		l, err := sandbox.Listen(Addr("x"))
		if err != nil {
			t.Fatalf("listen (%s)", err)
		}
		for i := 0; i < N; i++ {
			ready <- 1
			//println("receiver", i)
			conn, err := l.Accept()
			if err != nil {
				t.Fatalf("accept (%s)", err)
			}
			r := make([]byte, 3)
			if _, err := conn.Read(r); err != nil {
				t.Fatalf("read (%s)", err)
			}
			if !reflect.DeepEqual([]byte{0, 1, 2}, r) {
				t.Fatalf("unexpected read")
			}
			var w []byte = []byte{0, 1, 2}
			if _, err := conn.Write(w); err != nil {
				t.Fatalf("write (%s)", err)
			}
			if err := conn.Close(); err != nil {
				t.Fatalf("close (%s)", err)
			}
		}
		ready <- 1
	}()

	for i := 0; i < N; i++ {
		<-ready
		//println("sender", i)
		conn, err := sandbox.Dial(Addr("x"))
		if err != nil {
			t.Fatalf("dial (%s)", err)
		}
		var w []byte = []byte{0, 1, 2}
		if _, err := conn.Write(w); err != nil {
			t.Fatalf("write (%s)", err)
		}
		r := make([]byte, 3)
		if _, err := conn.Read(r); err != nil {
			t.Fatalf("read (%s)", err)
		}
		if err := conn.Close(); err != nil {
			t.Fatalf("close (%s)", err)
		}
	}
	<-ready
}
Example #7
0
func TestCodec(t *testing.T) {

	// Transport
	f := trace.NewFrame()
	// Carrier
	sx := sandbox.NewRandomUnreliableTransport(f.Refine("sandbox"), 3, 3, time.Second/4, time.Second/4)
	// Chain
	hx := chain.NewTransport(f.Refine("chain"), sx)
	// Faithful
	fx := faithful.NewTransport(f.Refine("faithful"), hx)
	// Codec
	cx := NewTransport(fx, GobCodec{})

	// Sync
	y := make(chan int)

	// Accepter
	go func() {
		l := cx.Listen(sandbox.Addr("@"))
		for i := 0; i < testN; i++ {
			y <- 1
			conn := l.Accept()
			msg := &testMsg{}
			if err := conn.Read(msg); err != nil {
				t.Fatalf("read (%s)", err)
				failNow()
			}
			if msg.Carry != i {
				t.Fatalf("check")
				failNow()
			}
			f.Printf("READ %d/%d CLOSING", i+1, testN)
			conn.Close()
			f.Printf("READ %d/%d √", i+1, testN)
		}
		y <- 1
	}()

	// Dialer
	for i := 0; i < testN; i++ {
		<-y
		conn := cx.Dial(sandbox.Addr("@"))
		if err := conn.Write(&testMsg{i}); err != nil {
			t.Fatalf("write (%s)", err)
			failNow()
		}
		f.Printf("WRITE %d/%d CLOSING", i+1, testN)
		if err := conn.Close(); err != nil {
			t.Fatalf("close (%s)", err)
			failNow()
		}
		f.Printf("WRITE %d/%d √", i+1, testN)
	}
	<-y
}
Example #8
0
func NewServer(inAddr, outAddr string) (*Server, error) {
	t := tele.NewStructOverTCP()
	l := t.Listen(tcp.Addr(outAddr))
	if outAddr == "" {
		outAddr = l.Addr().String()
		fmt.Println(outAddr)
	}
	srv := &Server{frame: trace.NewFrame("tele", "server"), tele: t, inAddr: inAddr, outAddr: outAddr}
	srv.frame.Bind(srv)
	go srv.loop(l)
	return srv, nil
}
Example #9
0
func NewStructOverTCP() *blend.Transport {
	f := trace.NewFrame()
	// Carrier
	x0 := tcp.Transport
	// Chain
	x1 := chain.NewTransport(f.Refine("chain"), x0)
	// Faithful
	x2 := faithful.NewTransport(f.Refine("faithful"), x1)
	// Codec
	x3 := codec.NewTransport(x2, codec.GobCodec{})
	// Blend
	return blend.NewTransport(f.Refine("blend"), x3)
}
Example #10
0
func (transport) Dial(addr net.Addr) (net.Conn, error) {
	c, err := net.Dial("tcp", addr.String())
	if err != nil {
		operr, ok := err.(*net.OpError)
		if !ok {
			return nil, err
		}
		if operr.Temporary() {
			return nil, err
		}
		return nil, carrier.ErrPerm
	}
	return &conn{trace.NewFrame("tcp", "dial"), c}, nil
}
func TestUnreliable(t *testing.T) {
	f := trace.NewFrame("TestDropTail")
	q, p := NewSievePipe(f.Refine("@r"), f.Refine("@w"), Addr("@r"), Addr("@w"), N, N, 0, 0)
	// Read goroutine
	ready := make(chan int)
	go func() {
		defer func() {
			close(ready)
		}()
		b, err := ioutil.ReadAll(q)
		// We get io.ErrUnexpectedEOF because the closing eof{} is not transmitted properly
		if err != io.ErrUnexpectedEOF {
			t.Fatalf("read all (%s)", err)
		}
		if len(b) != N {
			t.Fatalf("bad length")
		}
		for i := 0; i < N; i++ {
			if b[i] != byte(i) {
				t.Fatalf("unexpected byte @%d", i)
			}
		}
	}()
	// The following writes go through
	for i := 0; i < N; i++ {
		if n, err := p.Write([]byte{byte(i)}); err != nil || n != 1 {
			t.Fatalf("write %d (%v)", n, err)
		}
	}
	// The following writes are all dropped silently
	for i := 0; i+1 < N; i++ {
		if n, err := p.Write([]byte{byte(i)}); err != nil || n != 1 {
			t.Fatalf("write %d (%v)", n, err)
		}
	}
	// The last write is dropped quietly and also returns the unexpected EOF
	/*
		if n, err := p.Write([]byte{N - 1}); err != io.ErrUnexpectedEOF || n != 1 {
			t.Fatalf("write expects error (%v), got (%v); expects len %d, got %d", io.ErrUnexpectedEOF, err, 1, n)
		}
	*/
	if err := p.Close(); err != nil {
		t.Fatalf("close (%s)", err)
	}
	<-ready
}
func testConn(t *testing.T, mode testMode) {
	f := trace.NewFrame("testConn")
	f.Bind(&f)
	fsx := f.Refine("sandbox")
	fsx.Bind(&fsx)

	var x *sandbox.Transport
	if mode.Random {
		x = sandbox.NewRandomUnreliableTransport(fsx, mode.NOK, mode.NDrop, exp, exp)
	} else {
		x = sandbox.NewUnreliableTransport(fsx, mode.NOK, mode.NDrop, exp, exp)
	}

	ready := make(chan int, 3)

	// Accept side
	go func() {
		ax := NewTransport(f.Refine("faithful:a"), chain.NewTransport(f.Refine("chain:a"), x))
		l := ax.Listen(sandbox.Addr("@"))
		ready <- 1
		c := l.Accept()
		switch mode.Kind {
		case testDWAR:
			testRead(f, t, c, ready)
		case testDRAW:
			testWrite(f, t, c, ready)
		}
	}()

	// Dial side
	dx := NewTransport(f.Refine("faithful:d"), chain.NewTransport(f.Refine("chain:d"), x))
	<-ready
	c := dx.Dial(sandbox.Addr("@"))
	setabrt(func() {
		dbg := c.Debug().(*sandbox.DebugInfo)
		dbg.Out.Abort()
	})
	switch mode.Kind {
	case testDWAR:
		testWrite(f, t, c, ready)
	case testDRAW:
		testRead(f, t, c, ready)
	}
	_, _ = <-ready, <-ready // One from testRead and one from testWrite
}
Example #13
0
func testConn(t *testing.T, mode connMode) {
	// Transport
	frame := trace.NewFrame()
	var x carrier.Transport
	if mode.Random {
		x = sandbox.NewRandomUnreliableTransport(frame.Refine("sandbox"), mode.NOK, mode.NDrop, 0, 0)
	} else {
		x = sandbox.NewUnreliableTransport(frame.Refine("sandbox"), mode.NOK, mode.NDrop, 0, 0)
	}
	// Signalling
	ready := make(chan int, 2)
	feedfwd := make(chan byte, mode.NWrite()+1)

	// Accepter endpoint
	go func() {
		defer func() {
			ready <- 1 // SYNC: Notify that accepter-side logic is done
		}()

		l := NewListener(frame.Refine("chain", "listener"), x, sandbox.Addr(""))
		ready <- 1 // SYNC: Notify that listener is accepting
		switch mode.Kind {
		case testDWAR:
			testRead(t, l.Accept(), feedfwd)
		case testDRAW:
			testWrite(t, l.Accept(), mode, feedfwd)
		default:
			panic("u")
		}
	}()

	// Dialer endpoint
	<-ready // SYNC: Wait for listener to start accepting
	d := NewDialer(frame.Refine("chain", "dialer"), x)
	conn := d.Dial(sandbox.Addr(""))
	switch mode.Kind {
	case testDWAR:
		testWrite(t, conn, mode, feedfwd)
	case testDRAW:
		testRead(t, conn, feedfwd)
	default:
		panic("u")
	}
	<-ready // SYNC: Wait for accepter goroutine to complete
}
Example #14
0
func NewClient(inAddr, outAddr string) {
	cli := &Client{frame: trace.NewFrame("tele", "client"), outAddr: outAddr}
	cli.frame.Bind(cli)

	// Make teleport transport
	t := tele.NewStructOverTCP()

	// Listen on input TCP address
	l, err := net.Listen("tcp", inAddr)
	if err != nil {
		cli.frame.Printf("listen on teleport address %s (%s)", inAddr, err)
		os.Exit(1)
	}
	if inAddr == "" {
		inAddr = l.Addr().String()
		fmt.Println(inAddr)
	}
	cli.tele, cli.inAddr = t, inAddr
	go cli.loop(l)
	return
}
Example #15
0
// See the License for the specific language governing permissions and
// limitations under the License.

// Package tcp implements a carrier transport over TCP.
package tcp

import (
	"net"
	"strings"

	"github.com/petar/GoTeleport/tele/carrier"
	"github.com/petar/GoTeleport/tele/trace"
)

// Transport is a carrier.Transport over TCP.
var Transport = transport{trace.NewFrame("tcp")}

type transport struct {
	trace.Frame
}

func (transport) Listen(addr net.Addr) (net.Listener, error) {
	t := addr.String()
	if strings.Index(t, ":") < 0 {
		t = t + ":0"
	}
	l, err := net.Listen("tcp", t)
	if err != nil {
		return nil, err
	}
	return listener{l}, nil
Example #16
0
func Proxy(legacy net.Conn, tele *blend.Conn) {
	p := &proxy{frame: trace.NewFrame("proxy"), legacy: legacy, tele: tele}
	p.frame.Bind(p)
	go p.legacy2tele()
	go p.tele2legacy()
}