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package ackhandler
import (
"testing"
"time"
"github.com/quic-go/quic-go/internal/protocol"
"github.com/stretchr/testify/require"
)
func (h *sentPacketHistory) getPacketNumbers() []protocol.PacketNumber {
pns := make([]protocol.PacketNumber, 0, len(h.packets))
for _, p := range h.packets {
if p != nil && !p.skippedPacket {
pns = append(pns, p.PacketNumber)
}
}
return pns
}
func (h *sentPacketHistory) getSkippedPacketNumbers() []protocol.PacketNumber {
var pns []protocol.PacketNumber
for _, p := range h.packets {
if p != nil && p.skippedPacket {
pns = append(pns, p.PacketNumber)
}
}
return pns
}
func TestSentPacketHistoryPacketTracking(t *testing.T) {
hist := newSentPacketHistory(true)
now := time.Now()
require.False(t, hist.HasOutstandingPackets())
hist.SentAckElicitingPacket(&packet{PacketNumber: 0})
require.True(t, hist.HasOutstandingPackets())
hist.SentAckElicitingPacket(&packet{PacketNumber: 1})
hist.SentAckElicitingPacket(&packet{PacketNumber: 2})
require.Equal(t, []protocol.PacketNumber{0, 1, 2}, hist.getPacketNumbers())
require.Empty(t, hist.getSkippedPacketNumbers())
require.Equal(t, 3, hist.Len())
// non-ack-eliciting packets are not saved
hist.SentNonAckElicitingPacket(3)
hist.SentAckElicitingPacket(&packet{PacketNumber: 4, SendTime: now})
hist.SentNonAckElicitingPacket(5)
hist.SentAckElicitingPacket(&packet{PacketNumber: 6, SendTime: now})
require.Equal(t, []protocol.PacketNumber{0, 1, 2, 4, 6}, hist.getPacketNumbers())
// handle skipped packet numbers
hist.SkippedPacket(7)
hist.SentAckElicitingPacket(&packet{PacketNumber: 8})
hist.SentNonAckElicitingPacket(9)
hist.SkippedPacket(10)
hist.SentAckElicitingPacket(&packet{PacketNumber: 11})
require.Equal(t, []protocol.PacketNumber{0, 1, 2, 4, 6, 8, 11}, hist.getPacketNumbers())
require.Equal(t, []protocol.PacketNumber{7, 10}, hist.getSkippedPacketNumbers())
require.Equal(t, 12, hist.Len())
}
func TestSentPacketHistoryNonSequentialPacketNumberUse(t *testing.T) {
hist := newSentPacketHistory(true)
hist.SentAckElicitingPacket(&packet{PacketNumber: 100})
require.Panics(t, func() {
hist.SentAckElicitingPacket(&packet{PacketNumber: 102})
})
}
func TestSentPacketHistoryRemovePackets(t *testing.T) {
hist := newSentPacketHistory(true)
hist.SentAckElicitingPacket(&packet{PacketNumber: 0})
hist.SentAckElicitingPacket(&packet{PacketNumber: 1})
hist.SkippedPacket(2)
hist.SkippedPacket(3)
hist.SentAckElicitingPacket(&packet{PacketNumber: 4})
hist.SkippedPacket(5)
hist.SentAckElicitingPacket(&packet{PacketNumber: 6})
require.Equal(t, []protocol.PacketNumber{0, 1, 4, 6}, hist.getPacketNumbers())
require.Equal(t, []protocol.PacketNumber{2, 3, 5}, hist.getSkippedPacketNumbers())
require.NoError(t, hist.Remove(0))
require.NoError(t, hist.Remove(1))
require.Equal(t, []protocol.PacketNumber{4, 6}, hist.getPacketNumbers())
require.Equal(t, []protocol.PacketNumber{2, 3, 5}, hist.getSkippedPacketNumbers())
// add one more packet
hist.SentAckElicitingPacket(&packet{PacketNumber: 7})
require.Equal(t, []protocol.PacketNumber{4, 6, 7}, hist.getPacketNumbers())
// remove last packet and add another
require.NoError(t, hist.Remove(7))
hist.SentAckElicitingPacket(&packet{PacketNumber: 8})
require.Equal(t, []protocol.PacketNumber{4, 6, 8}, hist.getPacketNumbers())
// try to remove non-existent packet
err := hist.Remove(9)
require.Error(t, err)
require.EqualError(t, err, "packet 9 not found in sent packet history")
// Remove all packets
require.NoError(t, hist.Remove(4))
require.NoError(t, hist.Remove(6))
require.NoError(t, hist.Remove(8))
require.Empty(t, hist.getPacketNumbers())
require.Empty(t, hist.getSkippedPacketNumbers())
require.False(t, hist.HasOutstandingPackets())
}
func TestSentPacketHistoryFirstOutstandingPacket(t *testing.T) {
hist := newSentPacketHistory(true)
require.Nil(t, hist.FirstOutstanding())
hist.SentAckElicitingPacket(&packet{PacketNumber: 2})
hist.SentAckElicitingPacket(&packet{PacketNumber: 3})
front := hist.FirstOutstanding()
require.NotNil(t, front)
require.Equal(t, protocol.PacketNumber(2), front.PacketNumber)
// remove the first packet
hist.Remove(2)
front = hist.FirstOutstanding()
require.NotNil(t, front)
require.Equal(t, protocol.PacketNumber(3), front.PacketNumber)
// Path MTU packets are not regarded as outstanding
hist = newSentPacketHistory(true)
hist.SentAckElicitingPacket(&packet{PacketNumber: 2})
hist.SkippedPacket(3)
hist.SentAckElicitingPacket(&packet{PacketNumber: 4, IsPathMTUProbePacket: true})
front = hist.FirstOutstanding()
require.NotNil(t, front)
require.Equal(t, protocol.PacketNumber(2), front.PacketNumber)
}
func TestSentPacketHistoryIterating(t *testing.T) {
hist := newSentPacketHistory(true)
hist.SkippedPacket(0)
hist.SentAckElicitingPacket(&packet{PacketNumber: 1})
hist.SentAckElicitingPacket(&packet{PacketNumber: 2})
hist.SentAckElicitingPacket(&packet{PacketNumber: 3})
hist.SkippedPacket(4)
hist.SkippedPacket(5)
hist.SentAckElicitingPacket(&packet{PacketNumber: 6})
require.NoError(t, hist.Remove(3))
require.NoError(t, hist.Remove(4))
var packets, skippedPackets []protocol.PacketNumber
for p := range hist.Packets() {
if p.skippedPacket {
skippedPackets = append(skippedPackets, p.PacketNumber)
} else {
packets = append(packets, p.PacketNumber)
}
}
require.Equal(t, []protocol.PacketNumber{1, 2, 6}, packets)
require.Equal(t, []protocol.PacketNumber{0, 5}, skippedPackets)
}
func TestSentPacketHistoryDeleteWhileIterating(t *testing.T) {
hist := newSentPacketHistory(true)
hist.SentAckElicitingPacket(&packet{PacketNumber: 0})
hist.SentAckElicitingPacket(&packet{PacketNumber: 1})
hist.SkippedPacket(2)
hist.SentAckElicitingPacket(&packet{PacketNumber: 3})
hist.SkippedPacket(4)
hist.SentAckElicitingPacket(&packet{PacketNumber: 5})
var iterations []protocol.PacketNumber
for p := range hist.Packets() {
iterations = append(iterations, p.PacketNumber)
switch p.PacketNumber {
case 0:
require.NoError(t, hist.Remove(0))
case 4:
require.NoError(t, hist.Remove(4))
}
}
require.Equal(t, []protocol.PacketNumber{0, 1, 2, 3, 4, 5}, iterations)
require.Equal(t, []protocol.PacketNumber{1, 3, 5}, hist.getPacketNumbers())
require.Equal(t, []protocol.PacketNumber{2}, hist.getSkippedPacketNumbers())
}
func TestSentPacketHistoryPathProbes(t *testing.T) {
hist := newSentPacketHistory(true)
hist.SentAckElicitingPacket(&packet{PacketNumber: 0})
hist.SentAckElicitingPacket(&packet{PacketNumber: 1})
hist.SentPathProbePacket(&packet{PacketNumber: 2})
hist.SentAckElicitingPacket(&packet{PacketNumber: 3})
hist.SentAckElicitingPacket(&packet{PacketNumber: 4})
hist.SentPathProbePacket(&packet{PacketNumber: 5})
getPacketsInHistory := func(t *testing.T) []protocol.PacketNumber {
t.Helper()
var pns []protocol.PacketNumber
for p := range hist.Packets() {
pns = append(pns, p.PacketNumber)
switch p.PacketNumber {
case 2, 5:
require.True(t, p.isPathProbePacket)
default:
require.False(t, p.isPathProbePacket)
}
}
return pns
}
getPacketsInPathProbeHistory := func(t *testing.T) []protocol.PacketNumber {
t.Helper()
var pns []protocol.PacketNumber
for p := range hist.PathProbes() {
pns = append(pns, p.PacketNumber)
}
return pns
}
require.Equal(t, []protocol.PacketNumber{0, 1, 2, 3, 4, 5}, getPacketsInHistory(t))
require.Equal(t, []protocol.PacketNumber{2, 5}, getPacketsInPathProbeHistory(t))
// Removing packets from the regular packet history might happen before the path probe
// is declared lost, as the original path might have a smaller RTT than the path timeout.
// Therefore, the path probe packet is not removed from the path probe history.
require.NoError(t, hist.Remove(0))
require.NoError(t, hist.Remove(1))
require.NoError(t, hist.Remove(2))
require.NoError(t, hist.Remove(3))
require.Equal(t, []protocol.PacketNumber{4, 5}, getPacketsInHistory(t))
require.Equal(t, []protocol.PacketNumber{2, 5}, getPacketsInPathProbeHistory(t))
require.True(t, hist.HasOutstandingPackets())
require.True(t, hist.HasOutstandingPathProbes())
firstOutstanding := hist.FirstOutstanding()
require.NotNil(t, firstOutstanding)
require.Equal(t, protocol.PacketNumber(4), firstOutstanding.PacketNumber)
firstOutStandingPathProbe := hist.FirstOutstandingPathProbe()
require.NotNil(t, firstOutStandingPathProbe)
require.Equal(t, protocol.PacketNumber(2), firstOutStandingPathProbe.PacketNumber)
hist.RemovePathProbe(2)
require.Equal(t, []protocol.PacketNumber{4, 5}, getPacketsInHistory(t))
require.Equal(t, []protocol.PacketNumber{5}, getPacketsInPathProbeHistory(t))
require.True(t, hist.HasOutstandingPathProbes())
firstOutStandingPathProbe = hist.FirstOutstandingPathProbe()
require.NotNil(t, firstOutStandingPathProbe)
require.Equal(t, protocol.PacketNumber(5), firstOutStandingPathProbe.PacketNumber)
hist.RemovePathProbe(5)
require.Equal(t, []protocol.PacketNumber{4, 5}, getPacketsInHistory(t))
require.Empty(t, getPacketsInPathProbeHistory(t))
require.True(t, hist.HasOutstandingPackets())
require.False(t, hist.HasOutstandingPathProbes())
require.Nil(t, hist.FirstOutstandingPathProbe())
require.NoError(t, hist.Remove(4))
require.NoError(t, hist.Remove(5))
require.Empty(t, getPacketsInHistory(t))
require.False(t, hist.HasOutstandingPackets())
require.Nil(t, hist.FirstOutstanding())
// path probe packets are considered outstanding
hist.SentPathProbePacket(&packet{PacketNumber: 6})
require.False(t, hist.HasOutstandingPackets())
require.True(t, hist.HasOutstandingPathProbes())
firstOutStandingPathProbe = hist.FirstOutstandingPathProbe()
require.NotNil(t, firstOutStandingPathProbe)
require.Equal(t, protocol.PacketNumber(6), firstOutStandingPathProbe.PacketNumber)
hist.RemovePathProbe(6)
require.False(t, hist.HasOutstandingPackets())
require.Nil(t, hist.FirstOutstanding())
require.False(t, hist.HasOutstandingPathProbes())
require.Nil(t, hist.FirstOutstandingPathProbe())
}
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