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metrics/prometheus: define TYPE once, add tests (#21068)

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* metrics/prometheus: define type once for histograms

* metrics/prometheus: test collector
This commit is contained in:
Richard Patel 2020-05-26 11:00:09 +02:00 committed by GitHub
parent dbf6b8a797
commit 2f66a8d614
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 118 additions and 3 deletions
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11
metrics/prometheus/collector.go
View File

@ -30,7 +30,7 @@ var (
typeCounterTpl = "# TYPE %s counter\n"
typeSummaryTpl = "# TYPE %s summary\n"
keyValueTpl = "%s %v\n\n"
keyQuantileTagValueTpl = "%s {quantile=\"%s\"} %v\n\n"
keyQuantileTagValueTpl = "%s {quantile=\"%s\"} %v\n"
)
// collector is a collection of byte buffers that aggregate Prometheus reports
@ -39,7 +39,7 @@ type collector struct {
buff *bytes.Buffer
}
// newCollector createa a new Prometheus metric aggregator.
// newCollector creates a new Prometheus metric aggregator.
func newCollector() *collector {
return &collector{
buff: &bytes.Buffer{},
@ -62,9 +62,11 @@ func (c *collector) addHistogram(name string, m metrics.Histogram) {
pv := []float64{0.5, 0.75, 0.95, 0.99, 0.999, 0.9999}
ps := m.Percentiles(pv)
c.writeSummaryCounter(name, m.Count())
c.buff.WriteString(fmt.Sprintf(typeSummaryTpl, mutateKey(name)))
for i := range pv {
c.writeSummaryPercentile(name, strconv.FormatFloat(pv[i], 'f', -1, 64), ps[i])
}
c.buff.WriteRune('\n')
}
func (c *collector) addMeter(name string, m metrics.Meter) {
@ -75,9 +77,11 @@ func (c *collector) addTimer(name string, m metrics.Timer) {
pv := []float64{0.5, 0.75, 0.95, 0.99, 0.999, 0.9999}
ps := m.Percentiles(pv)
c.writeSummaryCounter(name, m.Count())
c.buff.WriteString(fmt.Sprintf(typeSummaryTpl, mutateKey(name)))
for i := range pv {
c.writeSummaryPercentile(name, strconv.FormatFloat(pv[i], 'f', -1, 64), ps[i])
}
c.buff.WriteRune('\n')
}
func (c *collector) addResettingTimer(name string, m metrics.ResettingTimer) {
@ -87,9 +91,11 @@ func (c *collector) addResettingTimer(name string, m metrics.ResettingTimer) {
ps := m.Percentiles([]float64{50, 95, 99})
val := m.Values()
c.writeSummaryCounter(name, len(val))
c.buff.WriteString(fmt.Sprintf(typeSummaryTpl, mutateKey(name)))
c.writeSummaryPercentile(name, "0.50", ps[0])
c.writeSummaryPercentile(name, "0.95", ps[1])
c.writeSummaryPercentile(name, "0.99", ps[2])
c.buff.WriteRune('\n')
}
func (c *collector) writeGaugeCounter(name string, value interface{}) {
@ -106,7 +112,6 @@ func (c *collector) writeSummaryCounter(name string, value interface{}) {
func (c *collector) writeSummaryPercentile(name, p string, value interface{}) {
name = mutateKey(name)
c.buff.WriteString(fmt.Sprintf(typeSummaryTpl, name))
c.buff.WriteString(fmt.Sprintf(keyQuantileTagValueTpl, name, p, value))
}

110
metrics/prometheus/collector_test.go Normal file
View File

@ -0,0 +1,110 @@
package prometheus
import (
"os"
"testing"
"time"
"github.com/ethereum/go-ethereum/metrics"
)
func TestMain(m *testing.M) {
metrics.Enabled = true
os.Exit(m.Run())
}
func TestCollector(t *testing.T) {
c := newCollector()
counter := metrics.NewCounter()
counter.Inc(12345)
c.addCounter("test/counter", counter)
gauge := metrics.NewGauge()
gauge.Update(23456)
c.addGauge("test/gauge", gauge)
gaugeFloat64 := metrics.NewGaugeFloat64()
gaugeFloat64.Update(34567.89)
c.addGaugeFloat64("test/gauge_float64", gaugeFloat64)
histogram := metrics.NewHistogram(&metrics.NilSample{})
c.addHistogram("test/histogram", histogram)
meter := metrics.NewMeter()
defer meter.Stop()
meter.Mark(9999999)
c.addMeter("test/meter", meter)
timer := metrics.NewTimer()
defer timer.Stop()
timer.Update(20 * time.Millisecond)
timer.Update(21 * time.Millisecond)
timer.Update(22 * time.Millisecond)
timer.Update(120 * time.Millisecond)
timer.Update(23 * time.Millisecond)
timer.Update(24 * time.Millisecond)
c.addTimer("test/timer", timer)
resettingTimer := metrics.NewResettingTimer()
resettingTimer.Update(10 * time.Millisecond)
resettingTimer.Update(11 * time.Millisecond)
resettingTimer.Update(12 * time.Millisecond)
resettingTimer.Update(120 * time.Millisecond)
resettingTimer.Update(13 * time.Millisecond)
resettingTimer.Update(14 * time.Millisecond)
c.addResettingTimer("test/resetting_timer", resettingTimer.Snapshot())
emptyResettingTimer := metrics.NewResettingTimer().Snapshot()
c.addResettingTimer("test/empty_resetting_timer", emptyResettingTimer)
const expectedOutput = `# TYPE test_counter gauge
test_counter 12345
# TYPE test_gauge gauge
test_gauge 23456
# TYPE test_gauge_float64 gauge
test_gauge_float64 34567.89
# TYPE test_histogram_count counter
test_histogram_count 0
# TYPE test_histogram summary
test_histogram {quantile="0.5"} 0
test_histogram {quantile="0.75"} 0
test_histogram {quantile="0.95"} 0
test_histogram {quantile="0.99"} 0
test_histogram {quantile="0.999"} 0
test_histogram {quantile="0.9999"} 0
# TYPE test_meter gauge
test_meter 9999999
# TYPE test_timer_count counter
test_timer_count 6
# TYPE test_timer summary
test_timer {quantile="0.5"} 2.25e+07
test_timer {quantile="0.75"} 4.8e+07
test_timer {quantile="0.95"} 1.2e+08
test_timer {quantile="0.99"} 1.2e+08
test_timer {quantile="0.999"} 1.2e+08
test_timer {quantile="0.9999"} 1.2e+08
# TYPE test_resetting_timer_count counter
test_resetting_timer_count 6
# TYPE test_resetting_timer summary
test_resetting_timer {quantile="0.50"} 12000000
test_resetting_timer {quantile="0.95"} 120000000
test_resetting_timer {quantile="0.99"} 120000000
`
exp := c.buff.String()
if exp != expectedOutput {
t.Log("Expected Output:\n", expectedOutput)
t.Log("Actual Output:\n", exp)
t.Fatal("unexpected collector output")
}
}