Source file
src/expvar/expvar_test.go
Documentation: expvar
1
2
3
4
5 package expvar
6
7 import (
8 "bytes"
9 "crypto/sha1"
10 "encoding/json"
11 "fmt"
12 "net"
13 "net/http/httptest"
14 "reflect"
15 "runtime"
16 "strconv"
17 "sync"
18 "sync/atomic"
19 "testing"
20 )
21
22
23
24 func RemoveAll() {
25 vars.keysMu.Lock()
26 defer vars.keysMu.Unlock()
27 for _, k := range vars.keys {
28 vars.m.Delete(k)
29 }
30 vars.keys = nil
31 }
32
33 func TestNil(t *testing.T) {
34 RemoveAll()
35 val := Get("missing")
36 if val != nil {
37 t.Errorf("got %v, want nil", val)
38 }
39 }
40
41 func TestInt(t *testing.T) {
42 RemoveAll()
43 reqs := NewInt("requests")
44 if i := reqs.Value(); i != 0 {
45 t.Errorf("reqs.Value() = %v, want 0", i)
46 }
47 if reqs != Get("requests").(*Int) {
48 t.Errorf("Get() failed.")
49 }
50
51 reqs.Add(1)
52 reqs.Add(3)
53 if i := reqs.Value(); i != 4 {
54 t.Errorf("reqs.Value() = %v, want 4", i)
55 }
56
57 if s := reqs.String(); s != "4" {
58 t.Errorf("reqs.String() = %q, want \"4\"", s)
59 }
60
61 reqs.Set(-2)
62 if i := reqs.Value(); i != -2 {
63 t.Errorf("reqs.Value() = %v, want -2", i)
64 }
65 }
66
67 func BenchmarkIntAdd(b *testing.B) {
68 var v Int
69
70 b.RunParallel(func(pb *testing.PB) {
71 for pb.Next() {
72 v.Add(1)
73 }
74 })
75 }
76
77 func BenchmarkIntSet(b *testing.B) {
78 var v Int
79
80 b.RunParallel(func(pb *testing.PB) {
81 for pb.Next() {
82 v.Set(1)
83 }
84 })
85 }
86
87 func TestFloat(t *testing.T) {
88 RemoveAll()
89 reqs := NewFloat("requests-float")
90 if reqs.f.Load() != 0.0 {
91 t.Errorf("reqs.f = %v, want 0", reqs.f.Load())
92 }
93 if reqs != Get("requests-float").(*Float) {
94 t.Errorf("Get() failed.")
95 }
96
97 reqs.Add(1.5)
98 reqs.Add(1.25)
99 if v := reqs.Value(); v != 2.75 {
100 t.Errorf("reqs.Value() = %v, want 2.75", v)
101 }
102
103 if s := reqs.String(); s != "2.75" {
104 t.Errorf("reqs.String() = %q, want \"4.64\"", s)
105 }
106
107 reqs.Add(-2)
108 if v := reqs.Value(); v != 0.75 {
109 t.Errorf("reqs.Value() = %v, want 0.75", v)
110 }
111 }
112
113 func BenchmarkFloatAdd(b *testing.B) {
114 var f Float
115
116 b.RunParallel(func(pb *testing.PB) {
117 for pb.Next() {
118 f.Add(1.0)
119 }
120 })
121 }
122
123 func BenchmarkFloatSet(b *testing.B) {
124 var f Float
125
126 b.RunParallel(func(pb *testing.PB) {
127 for pb.Next() {
128 f.Set(1.0)
129 }
130 })
131 }
132
133 func TestString(t *testing.T) {
134 RemoveAll()
135 name := NewString("my-name")
136 if s := name.Value(); s != "" {
137 t.Errorf(`NewString("my-name").Value() = %q, want ""`, s)
138 }
139
140 name.Set("Mike")
141 if s, want := name.String(), `"Mike"`; s != want {
142 t.Errorf(`after name.Set("Mike"), name.String() = %q, want %q`, s, want)
143 }
144 if s, want := name.Value(), "Mike"; s != want {
145 t.Errorf(`after name.Set("Mike"), name.Value() = %q, want %q`, s, want)
146 }
147
148
149 name.Set("<")
150 if s, want := name.String(), "\"\\u003c\""; s != want {
151 t.Errorf(`after name.Set("<"), name.String() = %q, want %q`, s, want)
152 }
153 }
154
155 func BenchmarkStringSet(b *testing.B) {
156 var s String
157
158 b.RunParallel(func(pb *testing.PB) {
159 for pb.Next() {
160 s.Set("red")
161 }
162 })
163 }
164
165 func TestMapInit(t *testing.T) {
166 RemoveAll()
167 colors := NewMap("bike-shed-colors")
168 colors.Add("red", 1)
169 colors.Add("blue", 1)
170 colors.Add("chartreuse", 1)
171
172 n := 0
173 colors.Do(func(KeyValue) { n++ })
174 if n != 3 {
175 t.Errorf("after three Add calls with distinct keys, Do should invoke f 3 times; got %v", n)
176 }
177
178 colors.Init()
179
180 n = 0
181 colors.Do(func(KeyValue) { n++ })
182 if n != 0 {
183 t.Errorf("after Init, Do should invoke f 0 times; got %v", n)
184 }
185 }
186
187 func TestMapDelete(t *testing.T) {
188 RemoveAll()
189 colors := NewMap("bike-shed-colors")
190
191 colors.Add("red", 1)
192 colors.Add("red", 2)
193 colors.Add("blue", 4)
194
195 n := 0
196 colors.Do(func(KeyValue) { n++ })
197 if n != 2 {
198 t.Errorf("after two Add calls with distinct keys, Do should invoke f 2 times; got %v", n)
199 }
200
201 colors.Delete("red")
202 n = 0
203 colors.Do(func(KeyValue) { n++ })
204 if n != 1 {
205 t.Errorf("removed red, Do should invoke f 1 times; got %v", n)
206 }
207
208 colors.Delete("notfound")
209 n = 0
210 colors.Do(func(KeyValue) { n++ })
211 if n != 1 {
212 t.Errorf("attempted to remove notfound, Do should invoke f 1 times; got %v", n)
213 }
214
215 colors.Delete("blue")
216 colors.Delete("blue")
217 n = 0
218 colors.Do(func(KeyValue) { n++ })
219 if n != 0 {
220 t.Errorf("all keys removed, Do should invoke f 0 times; got %v", n)
221 }
222 }
223
224 func TestMapCounter(t *testing.T) {
225 RemoveAll()
226 colors := NewMap("bike-shed-colors")
227
228 colors.Add("red", 1)
229 colors.Add("red", 2)
230 colors.Add("blue", 4)
231 colors.AddFloat(`green "midori"`, 4.125)
232 if x := colors.Get("red").(*Int).Value(); x != 3 {
233 t.Errorf("colors.m[\"red\"] = %v, want 3", x)
234 }
235 if x := colors.Get("blue").(*Int).Value(); x != 4 {
236 t.Errorf("colors.m[\"blue\"] = %v, want 4", x)
237 }
238 if x := colors.Get(`green "midori"`).(*Float).Value(); x != 4.125 {
239 t.Errorf("colors.m[`green \"midori\"] = %v, want 4.125", x)
240 }
241
242
243
244 s := colors.String()
245 var j any
246 err := json.Unmarshal([]byte(s), &j)
247 if err != nil {
248 t.Errorf("colors.String() isn't valid JSON: %v", err)
249 }
250 m, ok := j.(map[string]any)
251 if !ok {
252 t.Error("colors.String() didn't produce a map.")
253 }
254 red := m["red"]
255 x, ok := red.(float64)
256 if !ok {
257 t.Error("red.Kind() is not a number.")
258 }
259 if x != 3 {
260 t.Errorf("red = %v, want 3", x)
261 }
262 }
263
264 func TestMapNil(t *testing.T) {
265 RemoveAll()
266 const key = "key"
267 m := NewMap("issue527719")
268 m.Set(key, nil)
269 s := m.String()
270 var j any
271 if err := json.Unmarshal([]byte(s), &j); err != nil {
272 t.Fatalf("m.String() == %q isn't valid JSON: %v", s, err)
273 }
274 m2, ok := j.(map[string]any)
275 if !ok {
276 t.Fatalf("m.String() produced %T, wanted a map", j)
277 }
278 v, ok := m2[key]
279 if !ok {
280 t.Fatalf("missing %q in %v", key, m2)
281 }
282 if v != nil {
283 t.Fatalf("m[%q] = %v, want nil", key, v)
284 }
285 }
286
287 func BenchmarkMapSet(b *testing.B) {
288 m := new(Map).Init()
289
290 v := new(Int)
291
292 b.RunParallel(func(pb *testing.PB) {
293 for pb.Next() {
294 m.Set("red", v)
295 }
296 })
297 }
298
299 func BenchmarkMapSetDifferent(b *testing.B) {
300 procKeys := make([][]string, runtime.GOMAXPROCS(0))
301 for i := range procKeys {
302 keys := make([]string, 4)
303 for j := range keys {
304 keys[j] = fmt.Sprint(i, j)
305 }
306 procKeys[i] = keys
307 }
308
309 m := new(Map).Init()
310 v := new(Int)
311 b.ResetTimer()
312
313 var n int32
314 b.RunParallel(func(pb *testing.PB) {
315 i := int(atomic.AddInt32(&n, 1)-1) % len(procKeys)
316 keys := procKeys[i]
317
318 for pb.Next() {
319 for _, k := range keys {
320 m.Set(k, v)
321 }
322 }
323 })
324 }
325
326
327
328
329 func BenchmarkMapSetDifferentRandom(b *testing.B) {
330 keys := make([]string, 100)
331 for i := range keys {
332 keys[i] = fmt.Sprintf("%x", sha1.Sum([]byte(fmt.Sprint(i))))
333 }
334
335 v := new(Int)
336 b.ResetTimer()
337
338 for i := 0; i < b.N; i++ {
339 m := new(Map).Init()
340 for _, k := range keys {
341 m.Set(k, v)
342 }
343 }
344 }
345
346 func BenchmarkMapSetString(b *testing.B) {
347 m := new(Map).Init()
348
349 v := new(String)
350 v.Set("Hello, !")
351
352 b.RunParallel(func(pb *testing.PB) {
353 for pb.Next() {
354 m.Set("red", v)
355 }
356 })
357 }
358
359 func BenchmarkMapAddSame(b *testing.B) {
360 b.RunParallel(func(pb *testing.PB) {
361 for pb.Next() {
362 m := new(Map).Init()
363 m.Add("red", 1)
364 m.Add("red", 1)
365 m.Add("red", 1)
366 m.Add("red", 1)
367 }
368 })
369 }
370
371 func BenchmarkMapAddDifferent(b *testing.B) {
372 procKeys := make([][]string, runtime.GOMAXPROCS(0))
373 for i := range procKeys {
374 keys := make([]string, 4)
375 for j := range keys {
376 keys[j] = fmt.Sprint(i, j)
377 }
378 procKeys[i] = keys
379 }
380
381 b.ResetTimer()
382
383 var n int32
384 b.RunParallel(func(pb *testing.PB) {
385 i := int(atomic.AddInt32(&n, 1)-1) % len(procKeys)
386 keys := procKeys[i]
387
388 for pb.Next() {
389 m := new(Map).Init()
390 for _, k := range keys {
391 m.Add(k, 1)
392 }
393 }
394 })
395 }
396
397
398
399
400 func BenchmarkMapAddDifferentRandom(b *testing.B) {
401 keys := make([]string, 100)
402 for i := range keys {
403 keys[i] = fmt.Sprintf("%x", sha1.Sum([]byte(fmt.Sprint(i))))
404 }
405
406 b.ResetTimer()
407
408 for i := 0; i < b.N; i++ {
409 m := new(Map).Init()
410 for _, k := range keys {
411 m.Add(k, 1)
412 }
413 }
414 }
415
416 func BenchmarkMapAddSameSteadyState(b *testing.B) {
417 m := new(Map).Init()
418 b.RunParallel(func(pb *testing.PB) {
419 for pb.Next() {
420 m.Add("red", 1)
421 }
422 })
423 }
424
425 func BenchmarkMapAddDifferentSteadyState(b *testing.B) {
426 procKeys := make([][]string, runtime.GOMAXPROCS(0))
427 for i := range procKeys {
428 keys := make([]string, 4)
429 for j := range keys {
430 keys[j] = fmt.Sprint(i, j)
431 }
432 procKeys[i] = keys
433 }
434
435 m := new(Map).Init()
436 b.ResetTimer()
437
438 var n int32
439 b.RunParallel(func(pb *testing.PB) {
440 i := int(atomic.AddInt32(&n, 1)-1) % len(procKeys)
441 keys := procKeys[i]
442
443 for pb.Next() {
444 for _, k := range keys {
445 m.Add(k, 1)
446 }
447 }
448 })
449 }
450
451 func TestFunc(t *testing.T) {
452 RemoveAll()
453 var x any = []string{"a", "b"}
454 f := Func(func() any { return x })
455 if s, exp := f.String(), `["a","b"]`; s != exp {
456 t.Errorf(`f.String() = %q, want %q`, s, exp)
457 }
458 if v := f.Value(); !reflect.DeepEqual(v, x) {
459 t.Errorf(`f.Value() = %q, want %q`, v, x)
460 }
461
462 x = 17
463 if s, exp := f.String(), `17`; s != exp {
464 t.Errorf(`f.String() = %q, want %q`, s, exp)
465 }
466 }
467
468 func TestHandler(t *testing.T) {
469 RemoveAll()
470 m := NewMap("map1")
471 m.Add("a", 1)
472 m.Add("z", 2)
473 m2 := NewMap("map2")
474 for i := 0; i < 9; i++ {
475 m2.Add(strconv.Itoa(i), int64(i))
476 }
477 rr := httptest.NewRecorder()
478 rr.Body = new(bytes.Buffer)
479 expvarHandler(rr, nil)
480 want := `{
481 "map1": {"a": 1, "z": 2},
482 "map2": {"0": 0, "1": 1, "2": 2, "3": 3, "4": 4, "5": 5, "6": 6, "7": 7, "8": 8}
483 }
484 `
485 if got := rr.Body.String(); got != want {
486 t.Errorf("HTTP handler wrote:\n%s\nWant:\n%s", got, want)
487 }
488 }
489
490 func BenchmarkMapString(b *testing.B) {
491 var m, m1, m2 Map
492 m.Set("map1", &m1)
493 m1.Add("a", 1)
494 m1.Add("z", 2)
495 m.Set("map2", &m2)
496 for i := 0; i < 9; i++ {
497 m2.Add(strconv.Itoa(i), int64(i))
498 }
499 var s1, s2 String
500 m.Set("str1", &s1)
501 s1.Set("hello, world!")
502 m.Set("str2", &s2)
503 s2.Set("fizz buzz")
504 b.ResetTimer()
505
506 b.ReportAllocs()
507 for i := 0; i < b.N; i++ {
508 _ = m.String()
509 }
510 }
511
512 func BenchmarkRealworldExpvarUsage(b *testing.B) {
513 var (
514 bytesSent Int
515 bytesRead Int
516 )
517
518
519
520
521
522
523 b.StopTimer()
524
525 P := runtime.GOMAXPROCS(0)
526 N := b.N / P
527 W := 1000
528
529
530 clients := make([]net.Conn, P)
531 servers := make([]net.Conn, P)
532 ln, err := net.Listen("tcp", "127.0.0.1:0")
533 if err != nil {
534 b.Fatalf("Listen failed: %v", err)
535 }
536 defer ln.Close()
537 done := make(chan bool, 1)
538 go func() {
539 for p := 0; p < P; p++ {
540 s, err := ln.Accept()
541 if err != nil {
542 b.Errorf("Accept failed: %v", err)
543 done <- false
544 return
545 }
546 servers[p] = s
547 }
548 done <- true
549 }()
550 for p := 0; p < P; p++ {
551 c, err := net.Dial("tcp", ln.Addr().String())
552 if err != nil {
553 <-done
554 b.Fatalf("Dial failed: %v", err)
555 }
556 clients[p] = c
557 }
558 if !<-done {
559 b.FailNow()
560 }
561
562 b.StartTimer()
563
564 var wg sync.WaitGroup
565 wg.Add(4 * P)
566 for p := 0; p < P; p++ {
567
568 go func(c net.Conn) {
569 defer wg.Done()
570 var buf [1]byte
571 for i := 0; i < N; i++ {
572 v := byte(i)
573 for w := 0; w < W; w++ {
574 v *= v
575 }
576 buf[0] = v
577 n, err := c.Write(buf[:])
578 if err != nil {
579 b.Errorf("Write failed: %v", err)
580 return
581 }
582
583 bytesSent.Add(int64(n))
584 }
585 }(clients[p])
586
587
588 pipe := make(chan byte, 128)
589
590
591 go func(s net.Conn) {
592 defer wg.Done()
593 var buf [1]byte
594 for i := 0; i < N; i++ {
595 n, err := s.Read(buf[:])
596
597 if err != nil {
598 b.Errorf("Read failed: %v", err)
599 return
600 }
601
602 bytesRead.Add(int64(n))
603 pipe <- buf[0]
604 }
605 }(servers[p])
606
607
608 go func(s net.Conn) {
609 defer wg.Done()
610 var buf [1]byte
611 for i := 0; i < N; i++ {
612 v := <-pipe
613 for w := 0; w < W; w++ {
614 v *= v
615 }
616 buf[0] = v
617 n, err := s.Write(buf[:])
618 if err != nil {
619 b.Errorf("Write failed: %v", err)
620 return
621 }
622
623 bytesSent.Add(int64(n))
624 }
625 s.Close()
626 }(servers[p])
627
628
629 go func(c net.Conn) {
630 defer wg.Done()
631 var buf [1]byte
632 for i := 0; i < N; i++ {
633 n, err := c.Read(buf[:])
634
635 if err != nil {
636 b.Errorf("Read failed: %v", err)
637 return
638 }
639
640 bytesRead.Add(int64(n))
641 }
642 c.Close()
643 }(clients[p])
644 }
645 wg.Wait()
646 }
647
648 func TestAppendJSONQuote(t *testing.T) {
649 var b []byte
650 for i := 0; i < 128; i++ {
651 b = append(b, byte(i))
652 }
653 b = append(b, "\u2028\u2029"...)
654 got := string(appendJSONQuote(nil, string(b[:])))
655 want := `"` +
656 `\u0000\u0001\u0002\u0003\u0004\u0005\u0006\u0007\u0008\t\n\u000b\u000c\r\u000e\u000f` +
657 `\u0010\u0011\u0012\u0013\u0014\u0015\u0016\u0017\u0018\u0019\u001a\u001b\u001c\u001d\u001e\u001f` +
658 ` !\"#$%\u0026'()*+,-./0123456789:;\u003c=\u003e?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_` +
659 "`" + `abcdefghijklmnopqrstuvwxyz{|}~` + "\x7f" + `\u2028\u2029"`
660 if got != want {
661 t.Errorf("appendJSONQuote mismatch:\ngot %v\nwant %v", got, want)
662 }
663 }
664
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