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