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
|
package metrics
import (
"bytes"
"fmt"
"strings"
"testing"
"time"
)
func TestGetDefaultSet(t *testing.T) {
s := GetDefaultSet()
if s != defaultSet {
t.Fatalf("GetDefaultSet must return defaultSet=%p, but returned %p", defaultSet, s)
}
}
func TestUnregisterAllMetrics(t *testing.T) {
for j := 0; j < 3; j++ {
for i := 0; i < 10; i++ {
_ = NewCounter(fmt.Sprintf("counter_%d", i))
_ = NewSummary(fmt.Sprintf("summary_%d", i))
_ = NewHistogram(fmt.Sprintf("histogram_%d", i))
_ = NewGauge(fmt.Sprintf("gauge_%d", i), func() float64 { return 0 })
}
if mns := ListMetricNames(); len(mns) == 0 {
t.Fatalf("unexpected empty list of metrics on iteration %d", j)
}
UnregisterAllMetrics()
if mns := ListMetricNames(); len(mns) != 0 {
t.Fatalf("unexpected metric names after UnregisterAllMetrics call on iteration %d: %q", j, mns)
}
}
}
func TestRegisterUnregisterSet(t *testing.T) {
const metricName = "metric_from_set"
const metricValue = 123
s := NewSet()
c := s.NewCounter(metricName)
c.Set(metricValue)
RegisterSet(s)
var bb bytes.Buffer
WritePrometheus(&bb, false)
data := bb.String()
expectedLine := fmt.Sprintf("%s %d\n", metricName, metricValue)
if !strings.Contains(data, expectedLine) {
t.Fatalf("missing %q in\n%s", expectedLine, data)
}
UnregisterSet(s)
bb.Reset()
WritePrometheus(&bb, false)
data = bb.String()
if strings.Contains(data, expectedLine) {
t.Fatalf("unepected %q in\n%s", expectedLine, data)
}
}
func TestInvalidName(t *testing.T) {
f := func(name string) {
t.Helper()
expectPanic(t, fmt.Sprintf("NewCounter(%q)", name), func() { NewCounter(name) })
expectPanic(t, fmt.Sprintf("NewGauge(%q)", name), func() { NewGauge(name, func() float64 { return 0 }) })
expectPanic(t, fmt.Sprintf("NewSummary(%q)", name), func() { NewSummary(name) })
expectPanic(t, fmt.Sprintf("GetOrCreateCounter(%q)", name), func() { GetOrCreateCounter(name) })
expectPanic(t, fmt.Sprintf("GetOrCreateGauge(%q)", name), func() { GetOrCreateGauge(name, func() float64 { return 0 }) })
expectPanic(t, fmt.Sprintf("GetOrCreateSummary(%q)", name), func() { GetOrCreateSummary(name) })
expectPanic(t, fmt.Sprintf("GetOrCreateHistogram(%q)", name), func() { GetOrCreateHistogram(name) })
}
f("")
f("foo{")
f("foo}")
f("foo{bar")
f("foo{bar=")
f(`foo{bar="`)
f(`foo{bar="baz`)
f(`foo{bar="baz"`)
f(`foo{bar="baz",`)
f(`foo{bar="baz",}`)
}
func TestDoubleRegister(t *testing.T) {
t.Run("NewCounter", func(t *testing.T) {
name := "NewCounterDoubleRegister"
NewCounter(name)
expectPanic(t, name, func() { NewCounter(name) })
})
t.Run("NewGauge", func(t *testing.T) {
name := "NewGaugeDoubleRegister"
NewGauge(name, func() float64 { return 0 })
expectPanic(t, name, func() { NewGauge(name, func() float64 { return 0 }) })
})
t.Run("NewSummary", func(t *testing.T) {
name := "NewSummaryDoubleRegister"
NewSummary(name)
expectPanic(t, name, func() { NewSummary(name) })
})
t.Run("NewHistogram", func(t *testing.T) {
name := "NewHistogramDoubleRegister"
NewHistogram(name)
expectPanic(t, name, func() { NewSummary(name) })
})
}
func TestGetOrCreateNotCounter(t *testing.T) {
name := "GetOrCreateNotCounter"
NewSummary(name)
expectPanic(t, name, func() { GetOrCreateCounter(name) })
}
func TestGetOrCreateNotGauge(t *testing.T) {
name := "GetOrCreateNotGauge"
NewCounter(name)
expectPanic(t, name, func() { GetOrCreateGauge(name, func() float64 { return 0 }) })
}
func TestGetOrCreateNotSummary(t *testing.T) {
name := "GetOrCreateNotSummary"
NewCounter(name)
expectPanic(t, name, func() { GetOrCreateSummary(name) })
}
func TestGetOrCreateNotHistogram(t *testing.T) {
name := "GetOrCreateNotHistogram"
NewCounter(name)
expectPanic(t, name, func() { GetOrCreateHistogram(name) })
}
func TestWritePrometheusSerial(t *testing.T) {
if err := testWritePrometheus(); err != nil {
t.Fatal(err)
}
}
func TestWritePrometheusConcurrent(t *testing.T) {
if err := testConcurrent(testWritePrometheus); err != nil {
t.Fatal(err)
}
}
func testWritePrometheus() error {
var bb bytes.Buffer
WritePrometheus(&bb, false)
resultWithoutProcessMetrics := bb.String()
bb.Reset()
WritePrometheus(&bb, true)
resultWithProcessMetrics := bb.String()
if len(resultWithProcessMetrics) <= len(resultWithoutProcessMetrics) {
return fmt.Errorf("result with process metrics must contain more data than the result without process metrics; got\n%q\nvs\n%q",
resultWithProcessMetrics, resultWithoutProcessMetrics)
}
return nil
}
func expectPanic(t *testing.T, context string, f func()) {
t.Helper()
defer func() {
t.Helper()
if r := recover(); r == nil {
t.Fatalf("expecting panic in %s", context)
}
}()
f()
}
func testConcurrent(f func() error) error {
const concurrency = 5
resultsCh := make(chan error, concurrency)
for i := 0; i < concurrency; i++ {
go func() {
resultsCh <- f()
}()
}
for i := 0; i < concurrency; i++ {
select {
case err := <-resultsCh:
if err != nil {
return fmt.Errorf("unexpected error: %s", err)
}
case <-time.After(time.Second * 5):
return fmt.Errorf("timeout")
}
}
return nil
}
func testMarshalTo(t *testing.T, m metric, prefix, resultExpected string) {
t.Helper()
var bb bytes.Buffer
m.marshalTo(prefix, &bb)
result := bb.String()
if result != resultExpected {
t.Fatalf("unexpected marshaled metric;\ngot\n%q\nwant\n%q", result, resultExpected)
}
}
|
