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package metrics
import (
"context"
"encoding/json"
"fmt"
"net/http"
"net/http/httptest"
"testing"
"time"
"github.com/pascaldekloe/goe/verify"
)
func TestDisplayMetrics(t *testing.T) {
interval := 10 * time.Millisecond
inm := NewInmemSink(interval, 50*time.Millisecond)
// Add data points
inm.SetGauge([]string{"foo", "bar"}, 42)
inm.SetGaugeWithLabels([]string{"foo", "bar"}, 23, []Label{{"a", "b"}})
inm.EmitKey([]string{"foo", "bar"}, 42)
inm.IncrCounter([]string{"foo", "bar"}, 20)
inm.IncrCounter([]string{"foo", "bar"}, 22)
inm.IncrCounterWithLabels([]string{"foo", "bar"}, 20, []Label{{"a", "b"}})
inm.IncrCounterWithLabels([]string{"foo", "bar"}, 40, []Label{{"a", "b"}})
inm.AddSample([]string{"foo", "bar"}, 20)
inm.AddSample([]string{"foo", "bar"}, 24)
inm.AddSampleWithLabels([]string{"foo", "bar"}, 23, []Label{{"a", "b"}})
inm.AddSampleWithLabels([]string{"foo", "bar"}, 33, []Label{{"a", "b"}})
data := inm.Data()
if len(data) != 1 {
t.Fatalf("bad: %v", data)
}
expected := MetricsSummary{
Timestamp: data[0].Interval.Round(time.Second).UTC().String(),
Gauges: []GaugeValue{
{
Name: "foo.bar",
Hash: "foo.bar",
Value: float32(42),
DisplayLabels: map[string]string{},
},
{
Name: "foo.bar",
Hash: "foo.bar;a=b",
Value: float32(23),
DisplayLabels: map[string]string{"a": "b"},
},
},
Points: []PointValue{
{
Name: "foo.bar",
Points: []float32{42},
},
},
Counters: []SampledValue{
{
Name: "foo.bar",
Hash: "foo.bar",
AggregateSample: &AggregateSample{
Count: 2,
Min: 20,
Max: 22,
Sum: 42,
SumSq: 884,
Rate: 4200,
},
Mean: 21,
Stddev: 1.4142135623730951,
},
{
Name: "foo.bar",
Hash: "foo.bar;a=b",
AggregateSample: &AggregateSample{
Count: 2,
Min: 20,
Max: 40,
Sum: 60,
SumSq: 2000,
Rate: 6000,
},
Mean: 30,
Stddev: 14.142135623730951,
DisplayLabels: map[string]string{"a": "b"},
},
},
Samples: []SampledValue{
{
Name: "foo.bar",
Hash: "foo.bar",
AggregateSample: &AggregateSample{
Count: 2,
Min: 20,
Max: 24,
Sum: 44,
SumSq: 976,
Rate: 4400,
},
Mean: 22,
Stddev: 2.8284271247461903,
},
{
Name: "foo.bar",
Hash: "foo.bar;a=b",
AggregateSample: &AggregateSample{
Count: 2,
Min: 23,
Max: 33,
Sum: 56,
SumSq: 1618,
Rate: 5600,
},
Mean: 28,
Stddev: 7.0710678118654755,
DisplayLabels: map[string]string{"a": "b"},
},
},
}
raw, err := inm.DisplayMetrics(nil, nil)
if err != nil {
t.Fatalf("err: %v", err)
}
result := raw.(MetricsSummary)
// Ignore the LastUpdated field, we don't export that anyway
for i, got := range result.Counters {
expected.Counters[i].LastUpdated = got.LastUpdated
}
for i, got := range result.Samples {
expected.Samples[i].LastUpdated = got.LastUpdated
}
verify.Values(t, "all", result, expected)
}
func TestDisplayMetrics_RaceSetGauge(t *testing.T) {
interval := 200 * time.Millisecond
inm := NewInmemSink(interval, 10*interval)
result := make(chan float32)
go func() {
for {
time.Sleep(150 * time.Millisecond)
inm.SetGauge([]string{"foo", "bar"}, float32(42))
}
}()
go func() {
start := time.Now()
var summary MetricsSummary
// test for twenty intervals
for time.Now().Sub(start) < 20*interval {
time.Sleep(100 * time.Millisecond)
raw, _ := inm.DisplayMetrics(nil, nil)
summary = raw.(MetricsSummary)
}
// save result
for _, g := range summary.Gauges {
if g.Name == "foo.bar" {
result <- g.Value
}
}
close(result)
}()
got := <-result
verify.Values(t, "all", got, float32(42))
}
func TestDisplayMetrics_RaceAddSample(t *testing.T) {
interval := 200 * time.Millisecond
inm := NewInmemSink(interval, 10*interval)
result := make(chan float32)
go func() {
for {
time.Sleep(75 * time.Millisecond)
inm.AddSample([]string{"foo", "bar"}, float32(0.0))
}
}()
go func() {
start := time.Now()
var summary MetricsSummary
// test for twenty intervals
for time.Now().Sub(start) < 20*interval {
time.Sleep(100 * time.Millisecond)
raw, _ := inm.DisplayMetrics(nil, nil)
summary = raw.(MetricsSummary)
}
// save result
for _, g := range summary.Gauges {
if g.Name == "foo.bar" {
result <- g.Value
}
}
close(result)
}()
got := <-result
verify.Values(t, "all", got, float32(0.0))
}
func TestDisplayMetrics_RaceIncrCounter(t *testing.T) {
interval := 200 * time.Millisecond
inm := NewInmemSink(interval, 10*interval)
result := make(chan float32)
go func() {
for {
time.Sleep(75 * time.Millisecond)
inm.IncrCounter([]string{"foo", "bar"}, float32(0.0))
}
}()
go func() {
start := time.Now()
var summary MetricsSummary
// test for twenty intervals
for time.Now().Sub(start) < 20*interval {
time.Sleep(30 * time.Millisecond)
raw, _ := inm.DisplayMetrics(nil, nil)
summary = raw.(MetricsSummary)
}
// save result for testing
for _, g := range summary.Gauges {
if g.Name == "foo.bar" {
result <- g.Value
}
}
close(result)
}()
got := <-result
verify.Values(t, "all", got, float32(0.0))
}
func TestDisplayMetrics_RaceMetricsSetGauge(t *testing.T) {
interval := 200 * time.Millisecond
inm := NewInmemSink(interval, 10*interval)
met := &Metrics{Config: Config{FilterDefault: true}, sink: inm}
result := make(chan float32)
labels := []Label{
{"name1", "value1"},
{"name2", "value2"},
}
go func() {
for {
time.Sleep(75 * time.Millisecond)
met.SetGaugeWithLabels([]string{"foo", "bar"}, float32(42), labels)
}
}()
go func() {
start := time.Now()
var summary MetricsSummary
// test for twenty intervals
for time.Now().Sub(start) < 40*interval {
time.Sleep(150 * time.Millisecond)
raw, _ := inm.DisplayMetrics(nil, nil)
summary = raw.(MetricsSummary)
}
// save result
for _, g := range summary.Gauges {
if g.Name == "foo.bar" {
result <- g.Value
}
}
close(result)
}()
got := <-result
verify.Values(t, "all", got, float32(42))
}
func TestInmemSink_Stream(t *testing.T) {
interval := 10 * time.Millisecond
total := 50 * time.Millisecond
inm := NewInmemSink(interval, total)
ctx, cancel := context.WithTimeout(context.Background(), total*2)
defer cancel()
chDone := make(chan struct{})
go func() {
for i := float32(0); ctx.Err() == nil; i++ {
inm.SetGaugeWithLabels([]string{"gauge", "foo"}, 20+i, []Label{{"a", "b"}})
inm.EmitKey([]string{"key", "foo"}, 30+i)
inm.IncrCounterWithLabels([]string{"counter", "bar"}, 40+i, []Label{{"a", "b"}})
inm.IncrCounterWithLabels([]string{"counter", "bar"}, 50+i, []Label{{"a", "b"}})
inm.AddSampleWithLabels([]string{"sample", "bar"}, 60+i, []Label{{"a", "b"}})
inm.AddSampleWithLabels([]string{"sample", "bar"}, 70+i, []Label{{"a", "b"}})
time.Sleep(interval / 3)
}
close(chDone)
}()
resp := httptest.NewRecorder()
enc := encoder{
encoder: json.NewEncoder(resp),
flusher: resp,
}
inm.Stream(ctx, enc)
<-chDone
decoder := json.NewDecoder(resp.Body)
var prevGaugeValue float32
for i := 0; i < 8; i++ {
var summary MetricsSummary
if err := decoder.Decode(&summary); err != nil {
t.Fatalf("expected no error while decoding response %d, got %v", i, err)
}
if count := len(summary.Gauges); count != 1 {
t.Fatalf("expected at least one gauge in response %d, got %v", i, count)
}
value := summary.Gauges[0].Value
// The upper bound of the gauge value is not known, but we can expect it
// to be less than 50 because it increments by 3 every interval and we run
// for ~10 intervals.
if value < 20 || value > 50 {
t.Fatalf("expected interval %d guage value between 20 and 50, got %v", i, value)
}
if value <= prevGaugeValue {
t.Fatalf("expected interval %d guage value to be greater than previous, %v == %v", i, value, prevGaugeValue)
}
prevGaugeValue = value
}
}
type encoder struct {
flusher http.Flusher
encoder *json.Encoder
}
func (e encoder) Encode(metrics interface{}) error {
if err := e.encoder.Encode(metrics); err != nil {
fmt.Println("failed to encode metrics summary", "error", err)
return err
}
e.flusher.Flush()
return nil
}