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prometheus_test.go
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prometheus_test.go
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package prometheus
import (
"fmt"
"math"
"net/http"
"net/http/httptest"
"net/url"
"testing"
"time"
"github.com/influxdata/telegraf"
"github.com/influxdata/telegraf/testutil"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
const sampleTextFormat = `# HELP go_gc_duration_seconds A summary of the GC invocation durations.
# TYPE go_gc_duration_seconds summary
go_gc_duration_seconds{quantile="0"} 0.00010425500000000001
go_gc_duration_seconds{quantile="0.25"} 0.000139108
go_gc_duration_seconds{quantile="0.5"} 0.00015749400000000002
go_gc_duration_seconds{quantile="0.75"} 0.000331463
go_gc_duration_seconds{quantile="1"} 0.000667154
go_gc_duration_seconds_sum 0.0018183950000000002
go_gc_duration_seconds_count 7
# HELP go_goroutines Number of goroutines that currently exist.
# TYPE go_goroutines gauge
go_goroutines 15
# HELP test_metric An untyped metric with a timestamp
# TYPE test_metric untyped
test_metric{label="value"} 1.0 1490802350000
`
const sampleSummaryTextFormat = `# HELP go_gc_duration_seconds A summary of the GC invocation durations.
# TYPE go_gc_duration_seconds summary
go_gc_duration_seconds{quantile="0"} 0.00010425500000000001
go_gc_duration_seconds{quantile="0.25"} 0.000139108
go_gc_duration_seconds{quantile="0.5"} 0.00015749400000000002
go_gc_duration_seconds{quantile="0.75"} 0.000331463
go_gc_duration_seconds{quantile="1"} 0.000667154
go_gc_duration_seconds_sum 0.0018183950000000002
go_gc_duration_seconds_count 7
`
const sampleGaugeTextFormat = `
# HELP go_goroutines Number of goroutines that currently exist.
# TYPE go_goroutines gauge
go_goroutines 15 1490802350000
`
func TestPrometheusGeneratesMetrics(t *testing.T) {
ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
fmt.Fprintln(w, sampleTextFormat)
}))
defer ts.Close()
p := &Prometheus{
Log: testutil.Logger{},
URLs: []string{ts.URL},
URLTag: "url",
}
var acc testutil.Accumulator
err := acc.GatherError(p.Gather)
require.NoError(t, err)
assert.True(t, acc.HasFloatField("go_gc_duration_seconds", "count"))
assert.True(t, acc.HasFloatField("go_goroutines", "gauge"))
assert.True(t, acc.HasFloatField("test_metric", "value"))
assert.True(t, acc.HasTimestamp("test_metric", time.Unix(1490802350, 0)))
assert.False(t, acc.HasTag("test_metric", "address"))
assert.True(t, acc.TagValue("test_metric", "url") == ts.URL+"/metrics")
}
func TestPrometheusGeneratesMetricsWithHostNameTag(t *testing.T) {
ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
fmt.Fprintln(w, sampleTextFormat)
}))
defer ts.Close()
p := &Prometheus{
Log: testutil.Logger{},
KubernetesServices: []string{ts.URL},
URLTag: "url",
}
u, _ := url.Parse(ts.URL)
tsAddress := u.Hostname()
var acc testutil.Accumulator
err := acc.GatherError(p.Gather)
require.NoError(t, err)
assert.True(t, acc.HasFloatField("go_gc_duration_seconds", "count"))
assert.True(t, acc.HasFloatField("go_goroutines", "gauge"))
assert.True(t, acc.HasFloatField("test_metric", "value"))
assert.True(t, acc.HasTimestamp("test_metric", time.Unix(1490802350, 0)))
assert.True(t, acc.TagValue("test_metric", "address") == tsAddress)
assert.True(t, acc.TagValue("test_metric", "url") == ts.URL)
}
func TestPrometheusGeneratesMetricsAlthoughFirstDNSFailsIntegration(t *testing.T) {
if testing.Short() {
t.Skip("Skipping integration test in short mode")
}
ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
fmt.Fprintln(w, sampleTextFormat)
}))
defer ts.Close()
p := &Prometheus{
Log: testutil.Logger{},
URLs: []string{ts.URL},
KubernetesServices: []string{"http://random.telegraf.local:88/metrics"},
}
var acc testutil.Accumulator
err := acc.GatherError(p.Gather)
require.NoError(t, err)
assert.True(t, acc.HasFloatField("go_gc_duration_seconds", "count"))
assert.True(t, acc.HasFloatField("go_goroutines", "gauge"))
assert.True(t, acc.HasFloatField("test_metric", "value"))
assert.True(t, acc.HasTimestamp("test_metric", time.Unix(1490802350, 0)))
}
func TestPrometheusGeneratesSummaryMetricsV2(t *testing.T) {
ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
fmt.Fprintln(w, sampleSummaryTextFormat)
}))
defer ts.Close()
p := &Prometheus{
URLs: []string{ts.URL},
URLTag: "url",
MetricVersion: 2,
}
var acc testutil.Accumulator
err := acc.GatherError(p.Gather)
require.NoError(t, err)
assert.True(t, acc.TagSetValue("prometheus", "quantile") == "0")
assert.True(t, acc.HasFloatField("prometheus", "go_gc_duration_seconds_sum"))
assert.True(t, acc.HasFloatField("prometheus", "go_gc_duration_seconds_count"))
assert.True(t, acc.TagValue("prometheus", "url") == ts.URL+"/metrics")
}
func TestSummaryMayContainNaN(t *testing.T) {
const data = `# HELP go_gc_duration_seconds A summary of the GC invocation durations.
# TYPE go_gc_duration_seconds summary
go_gc_duration_seconds{quantile="0"} NaN
go_gc_duration_seconds{quantile="1"} NaN
go_gc_duration_seconds_sum 42.0
go_gc_duration_seconds_count 42
`
ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
fmt.Fprintln(w, data)
}))
defer ts.Close()
p := &Prometheus{
URLs: []string{ts.URL},
URLTag: "",
MetricVersion: 2,
}
var acc testutil.Accumulator
err := p.Gather(&acc)
require.NoError(t, err)
expected := []telegraf.Metric{
testutil.MustMetric(
"prometheus",
map[string]string{
"quantile": "0",
},
map[string]interface{}{
"go_gc_duration_seconds": math.NaN(),
},
time.Unix(0, 0),
telegraf.Summary,
),
testutil.MustMetric(
"prometheus",
map[string]string{
"quantile": "1",
},
map[string]interface{}{
"go_gc_duration_seconds": math.NaN(),
},
time.Unix(0, 0),
telegraf.Summary,
),
testutil.MustMetric(
"prometheus",
map[string]string{},
map[string]interface{}{
"go_gc_duration_seconds_sum": 42.0,
"go_gc_duration_seconds_count": 42.0,
},
time.Unix(0, 0),
telegraf.Summary,
),
}
testutil.RequireMetricsEqual(t, expected, acc.GetTelegrafMetrics(),
testutil.IgnoreTime(), testutil.SortMetrics())
}
func TestPrometheusGeneratesGaugeMetricsV2(t *testing.T) {
ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
fmt.Fprintln(w, sampleGaugeTextFormat)
}))
defer ts.Close()
p := &Prometheus{
URLs: []string{ts.URL},
URLTag: "url",
MetricVersion: 2,
}
var acc testutil.Accumulator
err := acc.GatherError(p.Gather)
require.NoError(t, err)
assert.True(t, acc.HasFloatField("prometheus", "go_goroutines"))
assert.True(t, acc.TagValue("prometheus", "url") == ts.URL+"/metrics")
assert.True(t, acc.HasTimestamp("prometheus", time.Unix(1490802350, 0)))
}