Adding metric testing on relay

Signed-off-by: Pedro Tanaka <pedro.tanaka@shopify.com>
This commit is contained in:
Pedro Tanaka 2022-04-21 11:43:33 +02:00
parent 78dcd3b7b2
commit 60742e1bd6
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@ -1,7 +1,10 @@
package relay
import (
"fmt"
"github.com/go-kit/log"
"github.com/prometheus/client_golang/prometheus"
dto "github.com/prometheus/client_model/go"
"github.com/prometheus/statsd_exporter/pkg/clock"
"github.com/stvp/go-udp-testing"
"testing"
@ -51,11 +54,97 @@ func TestRelay_RelayLine(t *testing.T) {
udp.ShouldReceive(t, tt.args.expected, func() {
for _, line := range tt.args.lines {
r.RelayLine(line)
// Tick time forward to trigger a flush
}
// Tick time forward to trigger a packet send.
clock.ClockInstance.Instant = time.Unix(20000, 0)
clock.ClockInstance.TickerCh <- time.Unix(20000, 0)
})
metrics, err := prometheus.DefaultGatherer.Gather()
if err != nil {
t.Fatalf("Cannot gather from DefaultGatherer: %v", err)
}
metricNames := map[string]float64{
"statsd_exporter_relay_long_lines_total": 0,
}
for metricName, expectedValue := range metricNames {
firstMetric := getFloat64(metrics, metricName, prometheus.Labels{"target": "localhost:1160"})
if firstMetric == nil {
t.Fatalf("Could not find time series with first label set for metric: %s", metricName)
}
if *firstMetric != expectedValue {
t.Errorf("Expected metric %s to be %f, got %f", metricName, expectedValue, *firstMetric)
}
}
})
}
}
// getFloat64 search for metric by name in array of MetricFamily and then search a value by labels.
// Method returns a value or nil if metric is not found.
func getFloat64(metrics []*dto.MetricFamily, name string, labels prometheus.Labels) *float64 {
var metricFamily *dto.MetricFamily
for _, m := range metrics {
if *m.Name == name {
metricFamily = m
break
}
}
if metricFamily == nil {
return nil
}
var metric *dto.Metric
labelStr := fmt.Sprintf("%v", labels)
for _, m := range metricFamily.Metric {
l := labelPairsAsLabels(m.GetLabel())
ls := fmt.Sprintf("%v", l)
if labelStr == ls {
metric = m
break
}
}
if metric == nil {
return nil
}
var value float64
if metric.Gauge != nil {
value = metric.Gauge.GetValue()
return &value
}
if metric.Counter != nil {
value = metric.Counter.GetValue()
return &value
}
if metric.Histogram != nil {
value = metric.Histogram.GetSampleSum()
return &value
}
if metric.Summary != nil {
value = metric.Summary.GetSampleSum()
return &value
}
if metric.Untyped != nil {
value = metric.Untyped.GetValue()
return &value
}
panic(fmt.Errorf("collected a non-gauge/counter/histogram/summary/untyped metric: %s", metric))
}
func labelPairsAsLabels(pairs []*dto.LabelPair) (labels prometheus.Labels) {
labels = prometheus.Labels{}
for _, pair := range pairs {
if pair.Name == nil {
continue
}
value := ""
if pair.Value != nil {
value = *pair.Value
}
labels[*pair.Name] = value
}
return
}