open-consul/agent/metrics/testing.go

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package metrics
import (
"bytes"
"fmt"
"testing"
"time"
"github.com/armon/go-metrics"
"github.com/stretchr/testify/assert"
)
// Returns an in memory metrics sink for tests to assert metrics are emitted.
// Do not enable t.Parallel() since this relies on the global metrics instance.
func TestSetupMetrics(t *testing.T, serviceName string) *metrics.InmemSink {
// Record for ages (5 mins) so we can be confident that our assertions won't
// fail on silly long test runs due to dropped data.
s := metrics.NewInmemSink(10*time.Second, 300*time.Second)
cfg := metrics.DefaultConfig(serviceName)
cfg.EnableHostname = false
cfg.EnableRuntimeMetrics = false
metrics.NewGlobal(cfg, s)
return s
}
// Asserts that a counter metric has the given value
func AssertCounter(t *testing.T, sink *metrics.InmemSink, name string, value float64) {
t.Helper()
data := sink.Data()
var got float64
for _, intv := range data {
intv.RLock()
// Note that InMemSink uses SampledValue and treats the _Sum_ not the Count
// as the entire value.
if sample, ok := intv.Counters[name]; ok {
got += sample.Sum
}
intv.RUnlock()
}
if !assert.Equal(t, value, got) {
// no nice way to dump this - this is copied from private method in
// InMemSink used for dumping to stdout on SIGUSR1.
buf := bytes.NewBuffer(nil)
for _, intv := range data {
intv.RLock()
for name, val := range intv.Gauges {
fmt.Fprintf(buf, "[%v][G] '%s': %0.3f\n", intv.Interval, name, val.Value)
}
for name, vals := range intv.Points {
for _, val := range vals {
fmt.Fprintf(buf, "[%v][P] '%s': %0.3f\n", intv.Interval, name, val)
}
}
for name, agg := range intv.Counters {
fmt.Fprintf(buf, "[%v][C] '%s': %s\n", intv.Interval, name, agg.AggregateSample)
}
for name, agg := range intv.Samples {
fmt.Fprintf(buf, "[%v][S] '%s': %s\n", intv.Interval, name, agg.AggregateSample)
}
intv.RUnlock()
}
t.Log(buf.String())
}
}
// Asserts that a gauge metric has the current value
func AssertGauge(t *testing.T, sink *metrics.InmemSink, name string, value float32) {
t.Helper()
data := sink.Data()
// Loop backward through intervals until there is a non-empty one
// Addresses flakiness around recording to one interval but accessing during the next
var got float32
for i := len(data) - 1; i >= 0; i-- {
currentInterval := data[i]
currentInterval.RLock()
if len(currentInterval.Gauges) > 0 {
got = currentInterval.Gauges[name].Value
currentInterval.RUnlock()
break
}
currentInterval.RUnlock()
}
if !assert.Equal(t, value, got) {
buf := bytes.NewBuffer(nil)
for _, intv := range data {
intv.RLock()
for name, val := range intv.Gauges {
fmt.Fprintf(buf, "[%v][G] '%s': %0.3f\n", intv.Interval, name, val.Value)
}
intv.RUnlock()
}
t.Log(buf.String())
}
}