1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
|
package ackhandler
import (
"slices"
"testing"
"github.com/quic-go/quic-go/internal/monotime"
"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 pn := range h.Packets() {
pns = append(pns, pn)
}
return pns
}
func TestSentPacketHistoryPacketTracking(t *testing.T) {
t.Run("first packet ack-eliciting", func(t *testing.T) {
testSentPacketHistoryPacketTracking(t, true)
})
t.Run("first packet non-ack-eliciting", func(t *testing.T) {
testSentPacketHistoryPacketTracking(t, false)
})
}
func testSentPacketHistoryPacketTracking(t *testing.T, firstPacketAckEliciting bool) {
hist := newSentPacketHistory(true)
now := monotime.Now()
var firstPacketNumber []protocol.PacketNumber
require.False(t, hist.HasOutstandingPackets())
if firstPacketAckEliciting {
hist.SentAckElicitingPacket(0, &packet{})
require.True(t, hist.HasOutstandingPackets())
firstPacketNumber = append(firstPacketNumber, 0)
} else {
hist.SentNonAckElicitingPacket(0)
require.False(t, hist.HasOutstandingPackets())
}
hist.SentAckElicitingPacket(1, &packet{})
hist.SentAckElicitingPacket(2, &packet{})
require.Equal(t, append(firstPacketNumber, 1, 2), hist.getPacketNumbers())
require.Empty(t, slices.Collect(hist.SkippedPackets()))
if firstPacketAckEliciting {
require.Equal(t, 3, hist.Len())
} else {
require.Equal(t, 2, hist.Len())
}
// non-ack-eliciting packets are not saved
hist.SentNonAckElicitingPacket(3)
hist.SentAckElicitingPacket(4, &packet{SendTime: now})
hist.SentNonAckElicitingPacket(5)
hist.SentAckElicitingPacket(6, &packet{SendTime: now})
require.Equal(t, append(firstPacketNumber, 1, 2, 4, 6), hist.getPacketNumbers())
// handle skipped packet numbers
hist.SkippedPacket(7)
hist.SentAckElicitingPacket(8, &packet{SendTime: now})
hist.SentNonAckElicitingPacket(9)
hist.SkippedPacket(10)
hist.SentAckElicitingPacket(11, &packet{SendTime: now})
require.Equal(t, append(firstPacketNumber, 1, 2, 4, 6, 8, 11), hist.getPacketNumbers())
require.Equal(t, []protocol.PacketNumber{7, 10}, slices.Collect(hist.SkippedPackets()))
if firstPacketAckEliciting {
require.Equal(t, 12, hist.Len())
} else {
require.Equal(t, 11, hist.Len())
}
}
func TestSentPacketHistoryNonSequentialPacketNumberUse(t *testing.T) {
hist := newSentPacketHistory(true)
hist.SentAckElicitingPacket(100, &packet{})
require.Panics(t, func() {
hist.SentAckElicitingPacket(102, &packet{})
})
}
func TestSentPacketHistoryRemovePackets(t *testing.T) {
hist := newSentPacketHistory(true)
hist.SentAckElicitingPacket(0, &packet{})
hist.SentAckElicitingPacket(1, &packet{})
hist.SkippedPacket(2)
hist.SkippedPacket(3)
hist.SentAckElicitingPacket(4, &packet{})
hist.SkippedPacket(5)
hist.SentAckElicitingPacket(6, &packet{})
require.Equal(t, []protocol.PacketNumber{0, 1, 4, 6}, hist.getPacketNumbers())
require.Equal(t, []protocol.PacketNumber{2, 3, 5}, slices.Collect(hist.SkippedPackets()))
require.NoError(t, hist.Remove(0))
require.Equal(t, []protocol.PacketNumber{2, 3, 5}, slices.Collect(hist.SkippedPackets()))
require.NoError(t, hist.Remove(1))
require.Equal(t, []protocol.PacketNumber{4, 6}, hist.getPacketNumbers())
// skipped packets should be preserved
require.Equal(t, []protocol.PacketNumber{2, 3, 5}, slices.Collect(hist.SkippedPackets()))
// add one more packet
hist.SentAckElicitingPacket(7, &packet{})
require.Equal(t, []protocol.PacketNumber{4, 6, 7}, hist.getPacketNumbers())
// remove last packet and add another
require.NoError(t, hist.Remove(7))
hist.SentAckElicitingPacket(8, &packet{})
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")
// only the last 4 skipped packets should be preserved
hist.SkippedPacket(9)
hist.SkippedPacket(10)
hist.SentAckElicitingPacket(11, &packet{})
hist.SkippedPacket(12)
require.Equal(t, []protocol.PacketNumber{5, 9, 10, 12}, slices.Collect(hist.SkippedPackets()))
// Remove all packets
require.NoError(t, hist.Remove(4))
require.NoError(t, hist.Remove(6))
require.NoError(t, hist.Remove(8))
require.NoError(t, hist.Remove(11))
require.Empty(t, hist.getPacketNumbers())
require.Len(t, slices.Collect(hist.SkippedPackets()), 4)
require.False(t, hist.HasOutstandingPackets())
}
func TestSentPacketHistoryFirstOutstandingPacket(t *testing.T) {
hist := newSentPacketHistory(true)
pn, p := hist.FirstOutstanding()
require.Equal(t, protocol.InvalidPacketNumber, pn)
require.Nil(t, p)
hist.SentAckElicitingPacket(2, &packet{})
hist.SentAckElicitingPacket(3, &packet{})
pn, p = hist.FirstOutstanding()
require.Equal(t, protocol.PacketNumber(2), pn)
require.NotNil(t, p)
// remove the first packet
hist.Remove(2)
pn, p = hist.FirstOutstanding()
require.Equal(t, protocol.PacketNumber(3), pn)
require.NotNil(t, p)
// Path MTU packets are not regarded as outstanding
hist = newSentPacketHistory(true)
hist.SentAckElicitingPacket(2, &packet{})
hist.SkippedPacket(3)
hist.SentAckElicitingPacket(4, &packet{IsPathMTUProbePacket: true})
pn, p = hist.FirstOutstanding()
require.NotNil(t, p)
require.Equal(t, protocol.PacketNumber(2), pn)
}
func TestSentPacketHistoryIterating(t *testing.T) {
hist := newSentPacketHistory(true)
hist.SkippedPacket(0)
hist.SentAckElicitingPacket(1, &packet{})
hist.SentAckElicitingPacket(2, &packet{})
hist.SentAckElicitingPacket(3, &packet{})
hist.SkippedPacket(4)
hist.SkippedPacket(5)
hist.SentAckElicitingPacket(6, &packet{})
require.Equal(t, []protocol.PacketNumber{0, 4, 5}, slices.Collect(hist.SkippedPackets()))
require.NoError(t, hist.Remove(3))
var packets []protocol.PacketNumber
for pn, p := range hist.Packets() {
require.NotNil(t, p)
packets = append(packets, pn)
}
require.Equal(t, []protocol.PacketNumber{1, 2, 6}, packets)
require.Equal(t, []protocol.PacketNumber{0, 4, 5}, slices.Collect(hist.SkippedPackets()))
}
func TestSentPacketHistoryDeleteWhileIterating(t *testing.T) {
hist := newSentPacketHistory(true)
hist.SentAckElicitingPacket(0, &packet{})
hist.SentAckElicitingPacket(1, &packet{})
hist.SkippedPacket(2)
hist.SentAckElicitingPacket(3, &packet{})
hist.SkippedPacket(4)
hist.SentAckElicitingPacket(5, &packet{})
var iterations []protocol.PacketNumber
for pn := range hist.Packets() {
iterations = append(iterations, pn)
switch pn {
case 0:
require.NoError(t, hist.Remove(0))
case 3:
require.NoError(t, hist.Remove(3))
}
}
require.Equal(t, []protocol.PacketNumber{0, 1, 3, 5}, iterations)
require.Equal(t, []protocol.PacketNumber{1, 5}, hist.getPacketNumbers())
require.Equal(t, []protocol.PacketNumber{2, 4}, slices.Collect(hist.SkippedPackets()))
}
func TestSentPacketHistoryPathProbes(t *testing.T) {
hist := newSentPacketHistory(true)
hist.SentAckElicitingPacket(0, &packet{})
hist.SentAckElicitingPacket(1, &packet{})
hist.SentPathProbePacket(2, &packet{})
hist.SentAckElicitingPacket(3, &packet{})
hist.SentAckElicitingPacket(4, &packet{})
hist.SentPathProbePacket(5, &packet{})
getPacketsInHistory := func(t *testing.T) []protocol.PacketNumber {
t.Helper()
var pns []protocol.PacketNumber
for pn, p := range hist.Packets() {
pns = append(pns, pn)
switch pn {
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 pn := range hist.PathProbes() {
pns = append(pns, pn)
}
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())
pn, p := hist.FirstOutstanding()
require.Equal(t, protocol.PacketNumber(4), pn)
require.NotNil(t, p)
pn, p = hist.FirstOutstandingPathProbe()
require.NotNil(t, p)
require.Equal(t, protocol.PacketNumber(2), pn)
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())
pn, p = hist.FirstOutstandingPathProbe()
require.NotNil(t, p)
require.Equal(t, protocol.PacketNumber(5), pn)
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())
pn, p = hist.FirstOutstandingPathProbe()
require.Equal(t, protocol.InvalidPacketNumber, pn)
require.Nil(t, p)
require.NoError(t, hist.Remove(4))
require.NoError(t, hist.Remove(5))
require.Empty(t, getPacketsInHistory(t))
require.False(t, hist.HasOutstandingPackets())
pn, p = hist.FirstOutstanding()
require.Equal(t, protocol.InvalidPacketNumber, pn)
require.Nil(t, p)
// path probe packets are considered outstanding
hist.SentPathProbePacket(6, &packet{})
require.False(t, hist.HasOutstandingPackets())
require.True(t, hist.HasOutstandingPathProbes())
pn, p = hist.FirstOutstandingPathProbe()
require.NotNil(t, p)
require.Equal(t, protocol.PacketNumber(6), pn)
hist.RemovePathProbe(6)
require.False(t, hist.HasOutstandingPackets())
pn, p = hist.FirstOutstanding()
require.Equal(t, protocol.InvalidPacketNumber, pn)
require.Nil(t, p)
require.False(t, hist.HasOutstandingPathProbes())
pn, p = hist.FirstOutstandingPathProbe()
require.Equal(t, protocol.InvalidPacketNumber, pn)
require.Nil(t, p)
}
func TestSentPacketHistoryDifference(t *testing.T) {
hist := newSentPacketHistory(true)
hist.SentNonAckElicitingPacket(0)
hist.SentAckElicitingPacket(1, &packet{})
hist.SentAckElicitingPacket(2, &packet{})
hist.SentAckElicitingPacket(3, &packet{})
hist.SkippedPacket(4)
hist.SkippedPacket(5)
hist.SentAckElicitingPacket(6, &packet{})
hist.SentNonAckElicitingPacket(7)
hist.SkippedPacket(8)
hist.SentAckElicitingPacket(9, &packet{})
require.Zero(t, hist.Difference(1, 1))
require.Zero(t, hist.Difference(2, 2))
require.Zero(t, hist.Difference(7, 7))
require.Equal(t, protocol.PacketNumber(1), hist.Difference(2, 1))
require.Equal(t, protocol.PacketNumber(2), hist.Difference(3, 1))
require.Equal(t, protocol.PacketNumber(3), hist.Difference(4, 1))
require.Equal(t, protocol.PacketNumber(3), hist.Difference(6, 1)) // 4 and 5 were skipped
require.Equal(t, protocol.PacketNumber(4), hist.Difference(7, 1)) // 4 and 5 were skipped
require.Equal(t, protocol.PacketNumber(3), hist.Difference(7, 2)) // 4 and 5 were skipped
require.Equal(t, protocol.PacketNumber(5), hist.Difference(9, 1)) // 4, 5 and 8 were skipped
}
|
