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|
package metrics
import (
"bytes"
"fmt"
"strings"
"testing"
"time"
)
func TestSummarySerial(t *testing.T) {
name := `TestSummarySerial`
s := NewSummary(name)
// Verify that the summary isn't visible in the output of WritePrometheus,
// since it doesn't contain any values yet.
var bb bytes.Buffer
WritePrometheus(&bb, false)
result := bb.String()
if strings.Contains(result, name) {
t.Fatalf("summary %s shouldn't be visible in the WritePrometheus output; got\n%s", name, result)
}
// Write data to summary
for i := 0; i < 2000; i++ {
s.Update(float64(i))
t := time.Now()
s.UpdateDuration(t.Add(-time.Millisecond * time.Duration(i)))
}
// Make sure the summary prints <prefix>_sum and <prefix>_count on marshalTo call
testMarshalTo(t, s, "prefix", fmt.Sprintf("prefix_sum %g\nprefix_count %d\n", s.sum, s.count))
testMarshalTo(t, s, `m{foo="bar"}`, fmt.Sprintf("m_sum{foo=\"bar\"} %g\nm_count{foo=\"bar\"} %d\n", s.sum, s.count))
// Verify s.quantileValues
s.updateQuantiles()
if s.quantileValues[len(s.quantileValues)-1] != 1999 {
t.Fatalf("unexpected quantileValues[last]; got %v; want %v", s.quantileValues[len(s.quantileValues)-1], 1999)
}
// Make sure the summary becomes visible in the output of WritePrometheus,
// since now it contains values.
bb.Reset()
WritePrometheus(&bb, false)
result = bb.String()
if !strings.Contains(result, name) {
t.Fatalf("missing summary %s in the WritePrometheus output; got\n%s", name, result)
}
}
func TestSummaryConcurrent(t *testing.T) {
name := "SummaryConcurrent"
s := NewSummary(name)
err := testConcurrent(func() error {
for i := 0; i < 10; i++ {
s.Update(float64(i))
}
return nil
})
if err != nil {
t.Fatal(err)
}
testMarshalTo(t, s, "prefix", "prefix_sum 225\nprefix_count 50\n")
}
func TestSummaryWithTags(t *testing.T) {
name := `TestSummary{tag="foo"}`
s := NewSummary(name)
s.Update(123)
var bb bytes.Buffer
WritePrometheus(&bb, false)
result := bb.String()
namePrefixWithTag := `TestSummary{tag="foo",quantile="`
if !strings.Contains(result, namePrefixWithTag) {
t.Fatalf("missing summary prefix %s in the WritePrometheus output; got\n%s", namePrefixWithTag, result)
}
}
func TestSummaryWithEmptyTags(t *testing.T) {
name := `TestSummary{}`
s := NewSummary(name)
s.Update(123)
var bb bytes.Buffer
WritePrometheus(&bb, false)
result := bb.String()
namePrefixWithTag := `TestSummary{quantile="`
if !strings.Contains(result, namePrefixWithTag) {
t.Fatalf("missing summary prefix %s in the WritePrometheus output; got\n%s", namePrefixWithTag, result)
}
}
func TestSummaryInvalidQuantiles(t *testing.T) {
name := "SummaryInvalidQuantiles"
expectPanic(t, name, func() {
NewSummaryExt(name, time.Minute, []float64{123, -234})
})
}
func TestSummarySmallWindow(t *testing.T) {
name := "SummarySmallWindow"
window := time.Millisecond * 20
quantiles := []float64{0.1, 0.2, 0.3}
s := NewSummaryExt(name, window, quantiles)
for i := 0; i < 2000; i++ {
s.Update(123)
}
// Wait for window update and verify that the summary has been cleared.
time.Sleep(2 * window)
var bb bytes.Buffer
WritePrometheus(&bb, false)
result := bb.String()
// <name>_sum and <name>_count are present in the output.
// Only <name>{quantile} shouldn't be present.
name += "{"
if strings.Contains(result, name) {
t.Fatalf("summary %s cannot be present in the WritePrometheus output; got\n%s", name, result)
}
}
func TestGetOrCreateSummaryInvalidWindow(t *testing.T) {
name := "GetOrCreateSummaryInvalidWindow"
GetOrCreateSummaryExt(name, defaultSummaryWindow, defaultSummaryQuantiles)
expectPanic(t, name, func() {
GetOrCreateSummaryExt(name, defaultSummaryWindow/2, defaultSummaryQuantiles)
})
}
func TestGetOrCreateSummaryInvalidQuantiles(t *testing.T) {
name := "GetOrCreateSummaryInvalidQuantiles"
GetOrCreateSummaryExt(name, defaultSummaryWindow, defaultSummaryQuantiles)
expectPanic(t, name, func() {
GetOrCreateSummaryExt(name, defaultSummaryWindow, []float64{0.1, 0.2})
})
quantiles := append([]float64{}, defaultSummaryQuantiles...)
quantiles[len(quantiles)-1] /= 2
expectPanic(t, name, func() {
GetOrCreateSummaryExt(name, defaultSummaryWindow, quantiles)
})
}
func TestGetOrCreateSummarySerial(t *testing.T) {
name := "GetOrCreateSummarySerial"
if err := testGetOrCreateSummary(name); err != nil {
t.Fatal(err)
}
}
func TestGetOrCreateSummaryConcurrent(t *testing.T) {
name := "GetOrCreateSummaryConcurrent"
err := testConcurrent(func() error {
return testGetOrCreateSummary(name)
})
if err != nil {
t.Fatal(err)
}
}
func testGetOrCreateSummary(name string) error {
s1 := GetOrCreateSummary(name)
for i := 0; i < 10; i++ {
s2 := GetOrCreateSummary(name)
if s1 != s2 {
return fmt.Errorf("unexpected summary returned; got %p; want %p", s2, s1)
}
}
return nil
}
|
