1//
2// Written by Maxim Khitrov (November 2012)
3//
4
5package flow
6
7import (
8 "bytes"
9 "testing"
10 "time"
11
12 ios_test "internal/os_test"
13)
14
15// XXX ugh, I can't even sleep milliseconds.
16// XXX
17
18const (
19 _50ms = 50 * time.Millisecond
20 _100ms = 100 * time.Millisecond
21 _200ms = 200 * time.Millisecond
22 _300ms = 300 * time.Millisecond
23 _400ms = 400 * time.Millisecond
24 _500ms = 500 * time.Millisecond
25)
26
27func nextStatus(m *Monitor) Status {
28 samples := m.samples
29 for i := 0; i < 30; i++ {
30 if s := m.Status(); s.Samples != samples {
31 return s
32 }
33 ios_test.Sleep(5 * time.Millisecond)
34 }
35 return m.Status()
36}
37
38func TestReader(t *testing.T) {
39 in := make([]byte, 100)
40 for i := range in {
41 in[i] = byte(i)
42 }
43 b := make([]byte, 100)
44 r := NewReader(bytes.NewReader(in), 100)
45 start := time.Now()
46
47 // Make sure r implements Limiter
48 _ = Limiter(r)
49
50 // 1st read of 10 bytes is performed immediately
51 if n, err := r.Read(b); n != 10 {
52 t.Fatalf("r.Read(b) expected 10 (<nil>); got %v", n)
53 } else if err != nil {
54 t.Fatalf("r.Read(b) expected 10 (<nil>); got %v (%v)", n, err.Error())
55 } else if rt := time.Since(start); rt > _50ms {
56 t.Fatalf("r.Read(b) took too long (%v)", rt.String())
57 }
58
59 // No new Reads allowed in the current sample
60 r.SetBlocking(false)
61 if n, err := r.Read(b); n != 0 {
62 t.Fatalf("r.Read(b) expected 0 (<nil>); got %v", n)
63 } else if err != nil {
64 t.Fatalf("r.Read(b) expected 0 (<nil>); got %v (%v)", n, err.Error())
65 } else if rt := time.Since(start); rt > _50ms {
66 t.Fatalf("r.Read(b) took too long (%v)", rt.String())
67 }
68
69 status := [6]Status{0: r.Status()} // No samples in the first status
70
71 // 2nd read of 10 bytes blocks until the next sample
72 // r.SetBlocking(true)
73 ios_test.Sleep(100 * time.Millisecond)
74 if n, err := r.Read(b[10:]); n != 10 {
75 t.Fatalf("r.Read(b[10:]) expected 10 (<nil>); got %v", n)
76 } else if err != nil {
77 t.Fatalf("r.Read(b[10:]) expected 10 (<nil>); got %v (%v)", n, err.Error())
78 } else if rt := time.Since(start); rt < _100ms {
79 t.Fatalf("r.Read(b[10:]) returned ahead of time (%v)", rt.String())
80 }
81
82 status[1] = r.Status() // 1st sample
83 status[2] = nextStatus(r.Monitor) // 2nd sample
84 status[3] = nextStatus(r.Monitor) // No activity for the 3rd sample
85
86 if n := r.Done(); n != 20 {
87 t.Fatalf("r.Done() expected 20; got %v", n)
88 }
89
90 status[4] = r.Status()
91 status[5] = nextStatus(r.Monitor) // Timeout
92 start = status[0].Start
93
94 // Active, Start, Duration, Idle, Bytes, Samples, InstRate, CurRate, AvgRate, PeakRate, BytesRem, TimeRem, Progress
95 want := []Status{
96 {true, start, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
97 {true, start, _100ms, 0, 10, 1, 100, 100, 100, 100, 0, 0, 0},
98 {true, start, _200ms, _100ms, 20, 2, 100, 100, 100, 100, 0, 0, 0},
99 {true, start, _300ms, _200ms, 20, 3, 0, 90, 67, 100, 0, 0, 0},
100 {false, start, _300ms, 0, 20, 3, 0, 0, 67, 100, 0, 0, 0},
101 {false, start, _300ms, 0, 20, 3, 0, 0, 67, 100, 0, 0, 0},
102 }
103 for i, s := range status {
104 // XXX s := s
105 if !statusesAreEqual(&s, &want[i]) {
106 t.Errorf("r.Status(%v)\nexpected: %v\ngot : %v", i, want[i].String(), s.String())
107 }
108 }
109 if !bytes.Equal(b[:20], in[:20]) {
110 t.Errorf("r.Read() input doesn't match output")
111 }
112}
113
114// XXX blocking writer test doesn't work.
115func _TestWriter(t *testing.T) {
116 b := make([]byte, 100)
117 for i := range b {
118 b[i] = byte(i)
119 }
120 w := NewWriter(&bytes.Buffer{}, 200)
121 start := time.Now()
122
123 // Make sure w implements Limiter
124 _ = Limiter(w)
125
126 // Non-blocking 20-byte write for the first sample returns ErrLimit
127 w.SetBlocking(false)
128 if n, err := w.Write(b); n != 20 || err != ErrLimit {
129 t.Fatalf("w.Write(b) expected 20 (ErrLimit); got %v (%v)", n, err.Error())
130 } else if rt := time.Since(start); rt > _50ms {
131 t.Fatalf("w.Write(b) took too long (%v)", rt)
132 }
133
134 // Blocking 80-byte write
135 // w.SetBlocking(true)
136 // XXX This test doesn't work, because w.Write calls w.Limit(block=false),
137 // XXX and it returns ErrLimit after 20. What we want is to keep waiting until 80 is returned,
138 // XXX but blocking isn't supported. Sleeping 800 shouldn't be sufficient either (its a burst).
139 // XXX This limits the usage of Limiter and m.Limit().
140 ios_test.Sleep(800 * time.Millisecond)
141 if n, err := w.Write(b[20:]); n < 80 {
142 } else if n != 80 || err != nil {
143 t.Fatalf("w.Write(b[20:]) expected 80 (<nil>); got %v (%v)", n, err.Error())
144 } else if rt := time.Since(start); rt < _300ms {
145 // Explanation for `rt < _300ms` (as opposed to `< _400ms`)
146 //
147 // |<-- start | |
148 // epochs: -----0ms|---100ms|---200ms|---300ms|---400ms
149 // sends: 20|20 |20 |20 |20#
150 //
151 // NOTE: The '#' symbol can thus happen before 400ms is up.
152 // Thus, we can only panic if rt < _300ms.
153 t.Fatalf("w.Write(b[20:]) returned ahead of time (%v)", rt.String())
154 }
155
156 w.SetTransferSize(100)
157 status := []Status{w.Status(), nextStatus(w.Monitor)}
158 start = status[0].Start
159
160 // Active, Start, Duration, Idle, Bytes, Samples, InstRate, CurRate, AvgRate, PeakRate, BytesRem, TimeRem, Progress
161 want := []Status{
162 {true, start, _400ms, 0, 80, 4, 200, 200, 200, 200, 20, _100ms, 80000},
163 {true, start, _500ms, _100ms, 100, 5, 200, 200, 200, 200, 0, 0, 100000},
164 }
165 for i, s := range status {
166 // XXX s := s
167 if !statusesAreEqual(&s, &want[i]) {
168 t.Errorf("w.Status(%v)\nexpected: %v\ngot : %v\n", i, want[i].String(), s.String())
169 }
170 }
171 if !bytes.Equal(b, w.Writer.(*bytes.Buffer).Bytes()) {
172 t.Errorf("w.Write() input doesn't match output")
173 }
174}
175
176const (
177 maxDeviationForDuration = 50 * time.Millisecond
178 maxDeviationForRate int64 = 50
179)
180
181// statusesAreEqual returns true if s1 is equal to s2. Equality here means
182// general equality of fields except for the duration and rates, which can
183// drift due to unpredictable delays (e.g. thread wakes up 25ms after
184// `time.Sleep` has ended).
185func statusesAreEqual(s1 *Status, s2 *Status) bool {
186 if s1.Active == s2.Active &&
187 s1.Start == s2.Start &&
188 durationsAreEqual(s1.Duration, s2.Duration, maxDeviationForDuration) &&
189 s1.Idle == s2.Idle &&
190 s1.Bytes == s2.Bytes &&
191 s1.Samples == s2.Samples &&
192 ratesAreEqual(s1.InstRate, s2.InstRate, maxDeviationForRate) &&
193 ratesAreEqual(s1.CurRate, s2.CurRate, maxDeviationForRate) &&
194 ratesAreEqual(s1.AvgRate, s2.AvgRate, maxDeviationForRate) &&
195 ratesAreEqual(s1.PeakRate, s2.PeakRate, maxDeviationForRate) &&
196 s1.BytesRem == s2.BytesRem &&
197 durationsAreEqual(s1.TimeRem, s2.TimeRem, maxDeviationForDuration) &&
198 s1.Progress == s2.Progress {
199 return true
200 }
201 return false
202}
203
204func durationsAreEqual(d1 time.Duration, d2 time.Duration, maxDeviation time.Duration) bool {
205 return d2-d1 <= maxDeviation
206}
207
208func ratesAreEqual(r1 int64, r2 int64, maxDeviation int64) bool {
209 sub := r1 - r2
210 if sub < 0 {
211 sub = -sub
212 }
213 if sub <= maxDeviation {
214 return true
215 }
216 return false
217}
io_test.gno
6.67 Kb ยท 217 lines
