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package prometheusmetrics
import (
"fmt"
"testing"
"time"
"github.com/prometheus/client_golang/prometheus"
dto "github.com/prometheus/client_model/go"
"github.com/rcrowley/go-metrics"
"google.golang.org/protobuf/encoding/prototext"
"google.golang.org/protobuf/proto"
)
func TestPrometheusRegistration(t *testing.T) {
defaultRegistry := prometheus.DefaultRegisterer
pClient := NewPrometheusProvider(metrics.DefaultRegistry, "test", "subsys", defaultRegistry, 1*time.Second)
if pClient.promRegistry != defaultRegistry {
t.Fatalf("Failed to pass prometheus registry to go-metrics provider")
}
}
func TestUpdatePrometheusMetricsOnce(t *testing.T) {
prometheusRegistry := prometheus.NewRegistry()
metricsRegistry := metrics.NewRegistry()
pClient := NewPrometheusProvider(metricsRegistry, "test", "subsys", prometheusRegistry, 1*time.Second)
metricsRegistry.Register("counter", metrics.NewCounter())
pClient.UpdatePrometheusMetricsOnce()
gauge := prometheus.NewGauge(prometheus.GaugeOpts{
Namespace: "test",
Subsystem: "subsys",
Name: "counter",
Help: "counter",
})
err := prometheusRegistry.Register(gauge)
if err == nil {
t.Fatalf("Go-metrics registry didn't get registered to prometheus registry")
}
}
func TestUpdatePrometheusMetrics(t *testing.T) {
prometheusRegistry := prometheus.NewRegistry()
metricsRegistry := metrics.NewRegistry()
pClient := NewPrometheusProvider(metricsRegistry, "test", "subsys", prometheusRegistry, 1*time.Second)
metricsRegistry.Register("counter", metrics.NewCounter())
go pClient.UpdatePrometheusMetrics()
time.Sleep(2 * time.Second)
gauge := prometheus.NewGauge(prometheus.GaugeOpts{
Namespace: "test",
Subsystem: "subsys",
Name: "counter",
Help: "counter",
})
err := prometheusRegistry.Register(gauge)
if err == nil {
t.Fatalf("Go-metrics registry didn't get registered to prometheus registry")
}
}
func TestPrometheusCounterGetUpdated(t *testing.T) {
prometheusRegistry := prometheus.NewRegistry()
metricsRegistry := metrics.NewRegistry()
pClient := NewPrometheusProvider(metricsRegistry, "test", "subsys", prometheusRegistry, 1*time.Second)
cntr := metrics.NewCounter()
metricsRegistry.Register("counter", cntr)
cntr.Inc(2)
go pClient.UpdatePrometheusMetrics()
cntr.Inc(13)
time.Sleep(5 * time.Second)
metrics, _ := prometheusRegistry.Gather()
expected := fmt.Sprintf("name:\"test_subsys_counter\" help:\"counter\" type:GAUGE metric:<gauge:<value:%d > > ", cntr.Count())
if err := compareProtoAndMetricFamily(expected, metrics[0]); err != nil {
t.Fatalf("Go-metrics value and prometheus metrics value do not match")
}
}
func TestPrometheusGaugeGetUpdated(t *testing.T) {
prometheusRegistry := prometheus.NewRegistry()
metricsRegistry := metrics.NewRegistry()
pClient := NewPrometheusProvider(metricsRegistry, "test", "subsys", prometheusRegistry, 1*time.Second)
gm := metrics.NewGauge()
metricsRegistry.Register("gauge", gm)
gm.Update(2)
go pClient.UpdatePrometheusMetrics()
gm.Update(13)
time.Sleep(5 * time.Second)
metrics, _ := prometheusRegistry.Gather()
if len(metrics) == 0 {
t.Fatalf("prometheus was unable to register the metric")
}
expected := fmt.Sprintf("name:\"test_subsys_gauge\" help:\"gauge\" type:GAUGE metric:<gauge:<value:%d > > ", gm.Value())
if err := compareProtoAndMetricFamily(expected, metrics[0]); err != nil {
t.Fatalf("Go-metrics value and prometheus metrics value do not match")
}
}
func TestPrometheusMeterGetUpdated(t *testing.T) {
prometheusRegistry := prometheus.NewRegistry()
metricsRegistry := metrics.NewRegistry()
pClient := NewPrometheusProvider(metricsRegistry, "test", "subsys", prometheusRegistry, time.Second)
gm := metrics.NewMeter()
metricsRegistry.Register("meter", gm)
gm.Mark(10)
// The meter ticker runs on a 5 second ticker, if we want to see rates with non zero values we must wait at least 5 seconds
// before updating again
time.Sleep(5100 * time.Millisecond)
gm.Mark(5)
// Ensure the prom registry has the most recent information
pClient.UpdatePrometheusMetricsOnce()
metrics, _ := prometheusRegistry.Gather()
snap := gm.Snapshot()
if len(metrics) == 0 {
t.Fatalf("prometheus was unable to register the metric")
}
expected := fmt.Sprintf(
"name:\"test_subsys_meter\" help:\"meter\" type:GAUGE metric:<label:<name:\"type\" value:\"count\" > gauge:<value:%v > > metric:<label:<name:\"type\" value:\"rate1\" > gauge:<value:%v > > metric:<label:<name:\"type\" value:\"rate15\" > gauge:<value:%v > > metric:<label:<name:\"type\" value:\"rate5\" > gauge:<value:%v > > metric:<label:<name:\"type\" value:\"rate_mean\" > gauge:<value:%v > > ",
snap.Count(), snap.Rate1(), snap.Rate15(), snap.Rate5(), snap.RateMean(),
)
if err := compareProtoAndMetricFamily(expected, metrics[0]); err != nil {
t.Fatalf("Go-metrics value and prometheus metrics value do not match")
}
}
func TestPrometheusHistogramGetUpdated(t *testing.T) {
prometheusRegistry := prometheus.NewRegistry()
metricsRegistry := metrics.NewRegistry()
pClient := NewPrometheusProvider(metricsRegistry, "test", "subsys", prometheusRegistry, 1*time.Second)
gm := metrics.NewHistogram(metrics.NewUniformSample(1028))
metricsRegistry.Register("metric", gm)
for ii := 0; ii < 94; ii++ {
gm.Update(1)
}
for ii := 0; ii < 5; ii++ {
gm.Update(5)
}
gm.Update(10)
go pClient.UpdatePrometheusMetrics()
time.Sleep(5 * time.Second)
metrics, _ := prometheusRegistry.Gather()
expected := fmt.Sprintf(
"name:\"test_subsys_metric\" help:\"metric\" type:GAUGE metric:<label:<name:\"type\" value:\"count\" > gauge:<value:%v > > metric:<label:<name:\"type\" value:\"max\" > gauge:<value:%v > > metric:<label:<name:\"type\" value:\"mean\" > gauge:<value:%v > > metric:<label:<name:\"type\" value:\"min\" > gauge:<value:%v > > metric:<label:<name:\"type\" value:\"perc75\" > gauge:<value:%v > > metric:<label:<name:\"type\" value:\"perc95\" > gauge:<value:%v > > metric:<label:<name:\"type\" value:\"perc99\" > gauge:<value:%v > > metric:<label:<name:\"type\" value:\"perc999\" > gauge:<value:%v > > metric:<label:<name:\"type\" value:\"stddev\" > gauge:<value:%v > > metric:<label:<name:\"type\" value:\"sum\" > gauge:<value:%v > > metric:<label:<name:\"type\" value:\"variance\" > gauge:<value:%v > > ",
gm.Count(),
gm.Max(),
gm.Mean(),
gm.Min(),
gm.Percentile(75),
gm.Percentile(95),
gm.Percentile(99),
gm.Percentile(999),
gm.StdDev(),
gm.Sum(),
gm.Variance(),
)
if err := compareProtoAndMetricFamily(expected, metrics[0]); err != nil {
t.Fatalf("Go-metrics value and prometheus metrics value do not match")
}
}
// compareProtoAndMetricFamily compares a text proto to a MetricFamily.
func compareProtoAndMetricFamily(wantText string, got *dto.MetricFamily) error {
want := &dto.MetricFamily{}
if err := prototext.Unmarshal([]byte(wantText), want); err != nil {
return fmt.Errorf("unexpected error unmarshaling MetricFamily text %v", wantText)
}
if !proto.Equal(want, got) {
return fmt.Errorf("wanted MetricFamily %v, got %v.", want, got)
}
return nil
}
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