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prometheus_client_v1_test.go
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package prometheus
import (
"fmt"
"io/ioutil"
"net/http"
"net/http/httptest"
"net/url"
"strings"
"testing"
"time"
"github.com/influxdata/telegraf"
inputs "github.com/influxdata/telegraf/plugins/inputs/prometheus"
"github.com/influxdata/telegraf/testutil"
"github.com/stretchr/testify/require"
)
func TestMetricVersion1(t *testing.T) {
Logger := testutil.Logger{Name: "outputs.prometheus_client"}
tests := []struct {
name string
output *PrometheusClient
metrics []telegraf.Metric
expected []byte
}{
{
name: "simple",
output: &PrometheusClient{
Listen: ":0",
MetricVersion: 1,
CollectorsExclude: []string{"gocollector", "process"},
Path: "/metrics",
Log: Logger,
},
metrics: []telegraf.Metric{
testutil.MustMetric(
"cpu",
map[string]string{
"host": "example.org",
},
map[string]interface{}{
"time_idle": 42.0,
},
time.Unix(0, 0),
),
},
expected: []byte(`
# HELP cpu_time_idle Telegraf collected metric
# TYPE cpu_time_idle untyped
cpu_time_idle{host="example.org"} 42
`),
},
{
name: "prometheus untyped",
output: &PrometheusClient{
Listen: ":0",
MetricVersion: 1,
CollectorsExclude: []string{"gocollector", "process"},
Path: "/metrics",
Log: Logger,
},
metrics: []telegraf.Metric{
testutil.MustMetric(
"cpu_time_idle",
map[string]string{
"host": "example.org",
},
map[string]interface{}{
"value": 42.0,
},
time.Unix(0, 0),
),
},
expected: []byte(`
# HELP cpu_time_idle Telegraf collected metric
# TYPE cpu_time_idle untyped
cpu_time_idle{host="example.org"} 42
`),
},
{
name: "prometheus counter",
output: &PrometheusClient{
Listen: ":0",
MetricVersion: 1,
CollectorsExclude: []string{"gocollector", "process"},
Path: "/metrics",
Log: Logger,
},
metrics: []telegraf.Metric{
testutil.MustMetric(
"cpu_time_idle",
map[string]string{
"host": "example.org",
},
map[string]interface{}{
"counter": 42.0,
},
time.Unix(0, 0),
telegraf.Counter,
),
},
expected: []byte(`
# HELP cpu_time_idle Telegraf collected metric
# TYPE cpu_time_idle counter
cpu_time_idle{host="example.org"} 42
`),
},
{
name: "replace characters when using string as label",
output: &PrometheusClient{
Listen: ":0",
MetricVersion: 1,
CollectorsExclude: []string{"gocollector", "process"},
Path: "/metrics",
StringAsLabel: true,
Log: Logger,
},
metrics: []telegraf.Metric{
testutil.MustMetric(
"cpu_time_idle",
map[string]string{},
map[string]interface{}{
"host:name": "example.org",
"counter": 42.0,
},
time.Unix(0, 0),
telegraf.Counter,
),
},
expected: []byte(`
# HELP cpu_time_idle Telegraf collected metric
# TYPE cpu_time_idle counter
cpu_time_idle{host_name="example.org"} 42
`),
},
{
name: "prometheus gauge",
output: &PrometheusClient{
Listen: ":0",
MetricVersion: 1,
CollectorsExclude: []string{"gocollector", "process"},
Path: "/metrics",
Log: Logger,
},
metrics: []telegraf.Metric{
testutil.MustMetric(
"cpu_time_idle",
map[string]string{
"host": "example.org",
},
map[string]interface{}{
"gauge": 42.0,
},
time.Unix(0, 0),
telegraf.Gauge,
),
},
expected: []byte(`
# HELP cpu_time_idle Telegraf collected metric
# TYPE cpu_time_idle gauge
cpu_time_idle{host="example.org"} 42
`),
},
{
name: "prometheus histogram",
output: &PrometheusClient{
Listen: ":0",
MetricVersion: 1,
CollectorsExclude: []string{"gocollector", "process"},
Path: "/metrics",
Log: Logger,
},
metrics: []telegraf.Metric{
testutil.MustMetric(
"http_request_duration_seconds",
map[string]string{},
map[string]interface{}{
"sum": 53423,
"0.05": 24054,
"0.1": 33444,
"0.2": 100392,
"0.5": 129389,
"1": 133988,
"+Inf": 144320,
"count": 144320,
},
time.Unix(0, 0),
telegraf.Histogram,
),
},
expected: []byte(`
# HELP http_request_duration_seconds Telegraf collected metric
# TYPE http_request_duration_seconds histogram
http_request_duration_seconds_bucket{le="0.05"} 24054
http_request_duration_seconds_bucket{le="0.1"} 33444
http_request_duration_seconds_bucket{le="0.2"} 100392
http_request_duration_seconds_bucket{le="0.5"} 129389
http_request_duration_seconds_bucket{le="1"} 133988
http_request_duration_seconds_bucket{le="+Inf"} 144320
http_request_duration_seconds_sum 53423
http_request_duration_seconds_count 144320
`),
},
{
name: "prometheus summary",
output: &PrometheusClient{
Listen: ":0",
MetricVersion: 1,
CollectorsExclude: []string{"gocollector", "process"},
Path: "/metrics",
Log: Logger,
},
metrics: []telegraf.Metric{
testutil.MustMetric(
"rpc_duration_seconds",
map[string]string{},
map[string]interface{}{
"0.01": 3102,
"0.05": 3272,
"0.5": 4773,
"0.9": 9001,
"0.99": 76656,
"count": 2693,
"sum": 17560473,
},
time.Unix(0, 0),
telegraf.Summary,
),
},
expected: []byte(`
# HELP rpc_duration_seconds Telegraf collected metric
# TYPE rpc_duration_seconds summary
rpc_duration_seconds{quantile="0.01"} 3102
rpc_duration_seconds{quantile="0.05"} 3272
rpc_duration_seconds{quantile="0.5"} 4773
rpc_duration_seconds{quantile="0.9"} 9001
rpc_duration_seconds{quantile="0.99"} 76656
rpc_duration_seconds_sum 1.7560473e+07
rpc_duration_seconds_count 2693
`),
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
err := tt.output.Init()
require.NoError(t, err)
err = tt.output.Connect()
require.NoError(t, err)
defer func() {
err := tt.output.Close()
require.NoError(t, err)
}()
err = tt.output.Write(tt.metrics)
require.NoError(t, err)
resp, err := http.Get(tt.output.URL())
require.NoError(t, err)
require.Equal(t, http.StatusOK, resp.StatusCode)
defer resp.Body.Close()
body, err := ioutil.ReadAll(resp.Body)
require.NoError(t, err)
require.Equal(t,
strings.TrimSpace(string(tt.expected)),
strings.TrimSpace(string(body)))
})
}
}
func TestRoundTripMetricVersion1(t *testing.T) {
Logger := testutil.Logger{Name: "outputs.prometheus_client"}
tests := []struct {
name string
data []byte
}{
{
name: "untyped",
data: []byte(`
# HELP cpu_time_idle Telegraf collected metric
# TYPE cpu_time_idle untyped
cpu_time_idle{host="example.org"} 42
`),
},
{
name: "counter",
data: []byte(`
# HELP cpu_time_idle Telegraf collected metric
# TYPE cpu_time_idle counter
cpu_time_idle{host="example.org"} 42
`),
},
{
name: "gauge",
data: []byte(`
# HELP cpu_time_idle Telegraf collected metric
# TYPE cpu_time_idle gauge
cpu_time_idle{host="example.org"} 42
`),
},
{
name: "multi",
data: []byte(`
# HELP cpu_time_guest Telegraf collected metric
# TYPE cpu_time_guest gauge
cpu_time_guest{host="one.example.org"} 42
cpu_time_guest{host="two.example.org"} 42
# HELP cpu_time_idle Telegraf collected metric
# TYPE cpu_time_idle gauge
cpu_time_idle{host="one.example.org"} 42
cpu_time_idle{host="two.example.org"} 42
`),
},
{
name: "histogram",
data: []byte(`
# HELP http_request_duration_seconds Telegraf collected metric
# TYPE http_request_duration_seconds histogram
http_request_duration_seconds_bucket{le="0.05"} 24054
http_request_duration_seconds_bucket{le="0.1"} 33444
http_request_duration_seconds_bucket{le="0.2"} 100392
http_request_duration_seconds_bucket{le="0.5"} 129389
http_request_duration_seconds_bucket{le="1"} 133988
http_request_duration_seconds_bucket{le="+Inf"} 144320
http_request_duration_seconds_sum 53423
http_request_duration_seconds_count 144320
`),
},
{
name: "summary",
data: []byte(`
# HELP rpc_duration_seconds Telegraf collected metric
# TYPE rpc_duration_seconds summary
rpc_duration_seconds{quantile="0.01"} 3102
rpc_duration_seconds{quantile="0.05"} 3272
rpc_duration_seconds{quantile="0.5"} 4773
rpc_duration_seconds{quantile="0.9"} 9001
rpc_duration_seconds{quantile="0.99"} 76656
rpc_duration_seconds_sum 1.7560473e+07
rpc_duration_seconds_count 2693
`),
},
}
ts := httptest.NewServer(http.NotFoundHandler())
defer ts.Close()
url := fmt.Sprintf("http://%s", ts.Listener.Addr())
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
ts.Config.Handler = http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.WriteHeader(http.StatusOK)
w.Write(tt.data)
})
input := &inputs.Prometheus{
URLs: []string{url},
URLTag: "",
MetricVersion: 1,
}
var acc testutil.Accumulator
err := input.Start(&acc)
require.NoError(t, err)
err = input.Gather(&acc)
require.NoError(t, err)
input.Stop()
metrics := acc.GetTelegrafMetrics()
output := &PrometheusClient{
Listen: "127.0.0.1:0",
Path: defaultPath,
MetricVersion: 1,
Log: Logger,
CollectorsExclude: []string{"gocollector", "process"},
}
err = output.Init()
require.NoError(t, err)
err = output.Connect()
require.NoError(t, err)
defer func() {
err = output.Close()
require.NoError(t, err)
}()
err = output.Write(metrics)
require.NoError(t, err)
resp, err := http.Get(output.URL())
require.NoError(t, err)
actual, err := ioutil.ReadAll(resp.Body)
require.NoError(t, err)
require.Equal(t,
strings.TrimSpace(string(tt.data)),
strings.TrimSpace(string(actual)))
})
}
}
func TestLandingPage(t *testing.T) {
Logger := testutil.Logger{Name: "outputs.prometheus_client"}
output := PrometheusClient{
Listen: ":0",
CollectorsExclude: []string{"process"},
MetricVersion: 1,
Log: Logger,
}
expected := "Telegraf Output Plugin: Prometheus Client"
err := output.Init()
require.NoError(t, err)
err = output.Connect()
require.NoError(t, err)
u, err := url.Parse(fmt.Sprintf("http://%s/", output.url.Host))
resp, err := http.Get(u.String())
require.NoError(t, err)
actual, err := ioutil.ReadAll(resp.Body)
require.NoError(t, err)
require.Equal(t, expected, strings.TrimSpace(string(actual)))
}