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package self_test
import (
"bytes"
"context"
"errors"
"fmt"
"io"
"net"
"sync/atomic"
"testing"
"time"
"github.com/quic-go/quic-go"
quicproxy "github.com/quic-go/quic-go/integrationtests/tools/proxy"
"github.com/stretchr/testify/require"
)
func TestConnectionMigration(t *testing.T) {
ln, err := quic.ListenAddr("localhost:0", getTLSConfig(), getQuicConfig(nil))
require.NoError(t, err)
defer ln.Close()
tr1 := &quic.Transport{Conn: newUDPConnLocalhost(t)}
defer tr1.Close()
tr2 := &quic.Transport{Conn: newUDPConnLocalhost(t)}
defer tr2.Close()
var packetsPath1, packetsPath2 atomic.Int64
const rtt = 5 * time.Millisecond
proxy := quicproxy.Proxy{
Conn: newUDPConnLocalhost(t),
ServerAddr: ln.Addr().(*net.UDPAddr),
DelayPacket: func(dir quicproxy.Direction, from, to net.Addr, _ []byte) time.Duration {
var port int
switch dir {
case quicproxy.DirectionIncoming:
port = from.(*net.UDPAddr).Port
case quicproxy.DirectionOutgoing:
port = to.(*net.UDPAddr).Port
}
switch port {
case tr1.Conn.LocalAddr().(*net.UDPAddr).Port:
packetsPath1.Add(1)
case tr2.Conn.LocalAddr().(*net.UDPAddr).Port:
packetsPath2.Add(1)
default:
fmt.Println("address not found", from)
}
return rtt / 2
},
}
require.NoError(t, proxy.Start())
defer proxy.Close()
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
defer cancel()
conn, err := tr1.Dial(ctx, proxy.LocalAddr(), getTLSClientConfig(), getQuicConfig(nil))
require.NoError(t, err)
defer conn.CloseWithError(0, "")
sconn, err := ln.Accept(ctx)
require.NoError(t, err)
defer sconn.CloseWithError(0, "")
sendAndReceiveFile := func(t *testing.T) {
t.Helper()
str, err := conn.OpenUniStream()
require.NoError(t, err)
errChan := make(chan error, 1)
go func() {
defer close(errChan)
sstr, err := sconn.AcceptUniStream(ctx)
if err != nil {
errChan <- fmt.Errorf("accepting stream: %w", err)
return
}
data, err := io.ReadAll(sstr)
if err != nil {
errChan <- fmt.Errorf("reading stream data: %w", err)
return
}
if !bytes.Equal(data, PRData) {
errChan <- errors.New("unexpected data")
}
}()
_, err = str.Write(PRData)
require.NoError(t, err)
require.NoError(t, str.Close())
select {
case err := <-errChan:
require.NoError(t, err)
case <-time.After(time.Second):
t.Fatal("timed out waiting for data")
}
}
sendAndReceiveFile(t) // stream 2
require.NotZero(t, packetsPath1.Load())
require.Zero(t, packetsPath2.Load())
// probing the path causes a few packets to be sent on path 2
path, err := conn.AddPath(tr2)
require.NoError(t, err)
require.ErrorIs(t, path.Switch(), quic.ErrPathNotValidated)
require.NoError(t, path.Probe(ctx))
require.Less(t, int(packetsPath2.Load()), 5)
// make sure that no more packets are sent on path 2 before switching to the path
c2 := packetsPath2.Load()
sendAndReceiveFile(t) // stream 6
require.Equal(t, packetsPath2.Load(), c2)
time.Sleep(3 * rtt) // wait for ACKs
// now switch and make sure that no packets are sent on path 1
require.NoError(t, path.Switch())
sendAndReceiveFile(t) // stream 10
c1 := packetsPath1.Load()
require.Equal(t, c1, packetsPath1.Load())
require.Greater(t, packetsPath2.Load(), c2)
require.Equal(t, tr2.Conn.LocalAddr(), conn.LocalAddr())
// switch back to the handshake path
time.Sleep(3 * rtt) // wait for ACKs
c1BeforeSwitch := packetsPath1.Load()
c2BeforeSwitch := packetsPath2.Load()
path2, err := conn.AddPath(tr1)
require.NoError(t, err)
require.NoError(t, path2.Probe(ctx))
time.Sleep(3 * rtt) // wait for ACKs
require.NoError(t, path2.Switch())
sendAndReceiveFile(t) // stream 14
require.Greater(t, packetsPath1.Load(), c1BeforeSwitch)
// some path probing might have happened
require.Less(t, int(packetsPath2.Load()-c2BeforeSwitch), 20)
require.Equal(t, tr1.Conn.LocalAddr(), conn.LocalAddr())
}
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