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write_metrics_test.go
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write_metrics_test.go
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package statuspage
import (
"bytes"
"strings"
"testing"
"unicode/utf8"
prometheusModels "github.com/prometheus/client_model/go"
"github.com/prometheus/common/expfmt"
"github.com/stretchr/testify/assert"
"github.com/trafficstars/metrics"
)
type testPrometheusEncoder struct {
t *testing.T
}
func (e *testPrometheusEncoder) Encode(family *prometheusModels.MetricFamily) error {
for _, metric := range family.Metric {
for _, label := range metric.Label {
if !utf8.ValidString(*label.Value) {
e.t.Errorf("An invalid UTF8 string: %v", []byte(*label.Value))
}
}
}
return nil
}
func TestEncodeMetricsPrometheus(t *testing.T) {
// Check if the format is correct
metrics.SetDefaultTags(metrics.Tags{
`tag0`: true,
`tag1`: true,
})
metric0 := metrics.Count(`test`, metrics.Tags{
`tag1`: true,
`invalidUTF8String`: string([]byte{0xff, 0xfe, 0xfd}),
`hackyString`: "dummyValue}\ninjectedMetric{",
})
metric0.Increment()
fastTags := metrics.NewFastTags().
Set(`tag1`, true).
Set(`tag2`, true)
metric1 := metrics.Count(`test`, fastTags)
metric1.Add(2)
assert.Equal(t, `test,tag2=true`, string(metric1.GetKey()))
status := map[string]interface{}{`metrics`: metrics.List()}
writeMetricsPrometheus(&testPrometheusEncoder{t: t}, ``, status)
buf := new(bytes.Buffer)
realPrometheusEncoder := expfmt.NewEncoder(buf, PrometheusFormat)
writeMetricsPrometheus(realPrometheusEncoder, ``, status)
lines := strings.Split(string(buf.Bytes()), "\n")
assert.Equal(t, 4, len(lines))
// Check if keys are correct
for _, line := range lines {
if strings.HasPrefix(line, `#`) {
continue
}
switch {
case strings.HasSuffix(line, ` 1`):
assert.Equal(t, `metrics_test{hackyString="dummyValue}\ninjectedMetric{",invalidUTF8String="//79",tag0="true",tag1="true"} 1`, line)
case strings.HasSuffix(line, ` 2`):
assert.Equal(t, `metrics_test{tag0="true",tag1="true",tag2="true"} 2`, line)
}
}
}