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
|
package metrics
import (
"fmt"
"sync"
"testing"
"time"
)
func TestNewSet(t *testing.T) {
var ss []*Set
for i := 0; i < 10; i++ {
s := NewSet()
ss = append(ss, s)
}
for i := 0; i < 10; i++ {
s := ss[i]
for j := 0; j < 10; j++ {
c := s.NewCounter(fmt.Sprintf("counter_%d", j))
c.Inc()
if n := c.Get(); n != 1 {
t.Fatalf("unexpected counter value; got %d; want %d", n, 1)
}
g := s.NewGauge(fmt.Sprintf("gauge_%d", j), func() float64 { return 123 })
if v := g.Get(); v != 123 {
t.Fatalf("unexpected gauge value; got %v; want %v", v, 123)
}
sm := s.NewSummary(fmt.Sprintf("summary_%d", j))
if sm == nil {
t.Fatalf("NewSummary returned nil")
}
h := s.NewHistogram(fmt.Sprintf("histogram_%d", j))
if h == nil {
t.Fatalf("NewHistogram returned nil")
}
}
}
}
func TestSetListMetricNames(t *testing.T) {
s := NewSet()
expect := []string{"cnt1", "cnt2", "cnt3"}
// Initialize a few counters
for _, n := range expect {
c := s.NewCounter(n)
c.Inc()
}
list := s.ListMetricNames()
if len(list) != len(expect) {
t.Fatalf("Metrics count is wrong for listing")
}
for _, e := range expect {
found := false
for _, n := range list {
if e == n {
found = true
}
}
if !found {
t.Fatalf("Metric %s not found in listing", e)
}
}
}
func TestSetUnregisterAllMetrics(t *testing.T) {
s := NewSet()
for j := 0; j < 3; j++ {
expectedMetricsCount := 0
for i := 0; i < 10; i++ {
_ = s.NewCounter(fmt.Sprintf("counter_%d", i))
_ = s.NewSummary(fmt.Sprintf("summary_%d", i))
_ = s.NewHistogram(fmt.Sprintf("histogram_%d", i))
_ = s.NewGauge(fmt.Sprintf("gauge_%d", i), func() float64 { return 0 })
expectedMetricsCount += 4
}
if mns := s.ListMetricNames(); len(mns) != expectedMetricsCount {
t.Fatalf("unexpected number of metric names on iteration %d; got %d; want %d;\nmetric names:\n%q", j, len(mns), expectedMetricsCount, mns)
}
s.UnregisterAllMetrics()
if mns := s.ListMetricNames(); len(mns) != 0 {
t.Fatalf("unexpected metric names after UnregisterAllMetrics call on iteration %d: %q", j, mns)
}
}
}
func TestSetUnregisterMetric(t *testing.T) {
s := NewSet()
const cName, smName = "counter_1", "summary_1"
// Initialize a few metrics
c := s.NewCounter(cName)
c.Inc()
sm := s.NewSummary(smName)
sm.Update(1)
// Unregister existing metrics
if !s.UnregisterMetric(cName) {
t.Fatalf("UnregisterMetric(%s) must return true", cName)
}
if !s.UnregisterMetric(smName) {
t.Fatalf("UnregisterMetric(%s) must return true", smName)
}
// Unregister twice must return false
if s.UnregisterMetric(cName) {
t.Fatalf("UnregisterMetric(%s) must return false on unregistered metric", cName)
}
if s.UnregisterMetric(smName) {
t.Fatalf("UnregisterMetric(%s) must return false on unregistered metric", smName)
}
// verify that registry is empty
if len(s.m) != 0 {
t.Fatalf("expected metrics map to be empty; got %d elements", len(s.m))
}
if len(s.a) != 0 {
t.Fatalf("expected metrics list to be empty; got %d elements", len(s.a))
}
// Validate metrics are removed
ok := false
for _, n := range s.ListMetricNames() {
if n == cName || n == smName {
ok = true
}
}
if ok {
t.Fatalf("Metric counter_1 and summary_1 must not be listed anymore after unregister")
}
// re-register with the same names supposed
// to be successful
s.NewCounter(cName).Inc()
s.NewSummary(smName).Update(float64(1))
}
// TestRegisterUnregister tests concurrent access to
// metrics during registering and unregistering.
// Should be tested specifically with `-race` enabled.
func TestRegisterUnregister(t *testing.T) {
const (
workers = 16
iterations = 1e3
)
wg := sync.WaitGroup{}
wg.Add(workers)
for n := 0; n < workers; n++ {
go func() {
defer wg.Done()
now := time.Now()
for i := 0; i < iterations; i++ {
iteration := i % 5
counter := fmt.Sprintf(`counter{iteration="%d"}`, iteration)
GetOrCreateCounter(counter).Add(i)
UnregisterMetric(counter)
histogram := fmt.Sprintf(`histogram{iteration="%d"}`, iteration)
GetOrCreateHistogram(histogram).UpdateDuration(now)
UnregisterMetric(histogram)
gauge := fmt.Sprintf(`gauge{iteration="%d"}`, iteration)
GetOrCreateGauge(gauge, func() float64 { return 1 })
UnregisterMetric(gauge)
summary := fmt.Sprintf(`summary{iteration="%d"}`, iteration)
GetOrCreateSummary(summary).Update(float64(i))
UnregisterMetric(summary)
}
}()
}
wg.Wait()
}
|
