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cloudwatch_test.go
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/
cloudwatch_test.go
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package cloudwatch
import (
"errors"
"fmt"
"strconv"
"sync"
"testing"
"github.com/aws/aws-sdk-go/service/cloudwatch"
"github.com/aws/aws-sdk-go/service/cloudwatch/cloudwatchiface"
"github.com/go-kit/kit/log"
"github.com/go-kit/kit/metrics"
"github.com/go-kit/kit/metrics/teststat"
)
const metricNameToGenerateError = "metric_name_used_to_throw_an_error"
var errTest = errors.New("test error")
type mockCloudWatch struct {
cloudwatchiface.CloudWatchAPI
mtx sync.RWMutex
valuesReceived map[string][]float64
dimensionsReceived map[string][]*cloudwatch.Dimension
}
func newMockCloudWatch() *mockCloudWatch {
return &mockCloudWatch{
valuesReceived: map[string][]float64{},
dimensionsReceived: map[string][]*cloudwatch.Dimension{},
}
}
func (mcw *mockCloudWatch) PutMetricData(input *cloudwatch.PutMetricDataInput) (*cloudwatch.PutMetricDataOutput, error) {
mcw.mtx.Lock()
defer mcw.mtx.Unlock()
for _, datum := range input.MetricData {
if *datum.MetricName == metricNameToGenerateError {
return nil, errTest
}
if len(datum.Values) > 0 {
for _, v := range datum.Values {
mcw.valuesReceived[*datum.MetricName] = append(mcw.valuesReceived[*datum.MetricName], *v)
}
} else {
mcw.valuesReceived[*datum.MetricName] = append(mcw.valuesReceived[*datum.MetricName], *datum.Value)
}
mcw.dimensionsReceived[*datum.MetricName] = datum.Dimensions
}
return nil, nil
}
func (mcw *mockCloudWatch) testDimensions(name string, labelValues ...string) error {
mcw.mtx.RLock()
_, hasValue := mcw.valuesReceived[name]
if !hasValue {
return nil // nothing to check; 0 samples were received
}
dimensions, ok := mcw.dimensionsReceived[name]
mcw.mtx.RUnlock()
if !ok {
if len(labelValues) > 0 {
return errors.New("Expected dimensions to be available, but none were")
}
}
LabelValues:
for i, j := 0, 0; i < len(labelValues); i, j = i+2, j+1 {
name, value := labelValues[i], labelValues[i+1]
for _, dimension := range dimensions {
if *dimension.Name == name {
if *dimension.Value == value {
break LabelValues
}
}
}
return fmt.Errorf("could not find dimension with name %s and value %s", name, value)
}
return nil
}
func TestCounter(t *testing.T) {
namespace, name := "abc", "def"
label, value := "label", "value"
svc := newMockCloudWatch()
cw := New(namespace, svc, WithLogger(log.NewNopLogger()))
counter := cw.NewCounter(name).With(label, value)
valuef := func() float64 {
if err := cw.Send(); err != nil {
t.Fatal(err)
}
svc.mtx.RLock()
defer svc.mtx.RUnlock()
value := svc.valuesReceived[name][len(svc.valuesReceived[name])-1]
delete(svc.valuesReceived, name)
return value
}
if err := teststat.TestCounter(counter, valuef); err != nil {
t.Fatal(err)
}
if err := teststat.TestCounter(counter, valuef); err != nil {
t.Fatal("Fill and flush counter 2nd time: ", err)
}
if err := svc.testDimensions(name, label, value); err != nil {
t.Fatal(err)
}
}
func TestCounterLowSendConcurrency(t *testing.T) {
namespace := "abc"
var names, labels, values []string
for i := 1; i <= 45; i++ {
num := strconv.Itoa(i)
names = append(names, "name"+num)
labels = append(labels, "label"+num)
values = append(values, "value"+num)
}
svc := newMockCloudWatch()
cw := New(namespace, svc,
WithLogger(log.NewNopLogger()),
WithConcurrentRequests(2),
)
counters := make(map[string]metrics.Counter)
var wants []float64
for i, name := range names {
counters[name] = cw.NewCounter(name).With(labels[i], values[i])
wants = append(wants, teststat.FillCounter(counters[name]))
}
if err := cw.Send(); err != nil {
t.Fatal(err)
}
for i, name := range names {
if l := len(svc.valuesReceived[name]); l == 0 && wants[i] == 0 {
continue
} else if l != 1 {
t.Fatalf("one value expected, got %d", l)
}
if svc.valuesReceived[name][0] != wants[i] {
t.Fatalf("want %f, have %f", wants[i], svc.valuesReceived[name])
}
if err := svc.testDimensions(name, labels[i], values[i]); err != nil {
t.Fatal(err)
}
}
}
func TestGauge(t *testing.T) {
namespace, name := "abc", "def"
label, value := "label", "value"
svc := newMockCloudWatch()
cw := New(namespace, svc, WithLogger(log.NewNopLogger()))
gauge := cw.NewGauge(name).With(label, value)
valuef := func() []float64 {
if err := cw.Send(); err != nil {
t.Fatal(err)
}
svc.mtx.RLock()
res := svc.valuesReceived[name]
delete(svc.valuesReceived, name)
defer svc.mtx.RUnlock()
return res
}
if err := teststat.TestGauge(gauge, valuef); err != nil {
t.Fatal(err)
}
if err := svc.testDimensions(name, label, value); err != nil {
t.Fatal(err)
}
}
func TestHistogram(t *testing.T) {
namespace, name := "abc", "def"
label, value := "label", "value"
svc := newMockCloudWatch()
cw := New(namespace, svc, WithLogger(log.NewNopLogger()))
histogram := cw.NewHistogram(name).With(label, value)
n50 := fmt.Sprintf("%s_50", name)
n90 := fmt.Sprintf("%s_90", name)
n95 := fmt.Sprintf("%s_95", name)
n99 := fmt.Sprintf("%s_99", name)
quantiles := func() (p50, p90, p95, p99 float64) {
err := cw.Send()
if err != nil {
t.Fatal(err)
}
svc.mtx.RLock()
defer svc.mtx.RUnlock()
if len(svc.valuesReceived[n50]) > 0 {
p50 = svc.valuesReceived[n50][0]
delete(svc.valuesReceived, n50)
}
if len(svc.valuesReceived[n90]) > 0 {
p90 = svc.valuesReceived[n90][0]
delete(svc.valuesReceived, n90)
}
if len(svc.valuesReceived[n95]) > 0 {
p95 = svc.valuesReceived[n95][0]
delete(svc.valuesReceived, n95)
}
if len(svc.valuesReceived[n99]) > 0 {
p99 = svc.valuesReceived[n99][0]
delete(svc.valuesReceived, n99)
}
return
}
if err := teststat.TestHistogram(histogram, quantiles, 0.01); err != nil {
t.Fatal(err)
}
if err := svc.testDimensions(n50, label, value); err != nil {
t.Fatal(err)
}
if err := svc.testDimensions(n90, label, value); err != nil {
t.Fatal(err)
}
if err := svc.testDimensions(n95, label, value); err != nil {
t.Fatal(err)
}
if err := svc.testDimensions(n99, label, value); err != nil {
t.Fatal(err)
}
// now test with only 2 custom percentiles
//
svc = newMockCloudWatch()
cw = New(namespace, svc, WithLogger(log.NewNopLogger()), WithPercentiles(0.50, 0.90))
histogram = cw.NewHistogram(name).With(label, value)
customQuantiles := func() (p50, p90, p95, p99 float64) {
err := cw.Send()
if err != nil {
t.Fatal(err)
}
svc.mtx.RLock()
defer svc.mtx.RUnlock()
if len(svc.valuesReceived[n50]) > 0 {
p50 = svc.valuesReceived[n50][0]
delete(svc.valuesReceived, n50)
}
if len(svc.valuesReceived[n90]) > 0 {
p90 = svc.valuesReceived[n90][0]
delete(svc.valuesReceived, n90)
}
// our teststat.TestHistogram wants us to give p95 and p99,
// but with custom percentiles we don't have those.
// So fake them. Maybe we should make teststat.nvq() public and use that?
p95 = 541.121341
p99 = 558.158697
// but fail if they are actually set (because that would mean the
// WithPercentiles() is not respected)
if _, isSet := svc.valuesReceived[n95]; isSet {
t.Fatal("p95 should not be set")
}
if _, isSet := svc.valuesReceived[n99]; isSet {
t.Fatal("p99 should not be set")
}
return
}
if err := teststat.TestHistogram(histogram, customQuantiles, 0.01); err != nil {
t.Fatal(err)
}
if err := svc.testDimensions(n50, label, value); err != nil {
t.Fatal(err)
}
if err := svc.testDimensions(n90, label, value); err != nil {
t.Fatal(err)
}
if err := svc.testDimensions(n95, label, value); err != nil {
t.Fatal(err)
}
if err := svc.testDimensions(n99, label, value); err != nil {
t.Fatal(err)
}
}
func TestErrorLog(t *testing.T) {
namespace := "abc"
svc := newMockCloudWatch()
cw := New(namespace, svc, WithLogger(log.NewNopLogger()))
cw.NewGauge(metricNameToGenerateError).Set(123)
if err := cw.Send(); err != errTest {
t.Fatal("Expected error, but didn't get one")
}
}