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package metrics
import (
"io/ioutil"
"net/http"
"net/http/httptest"
"testing"
"time"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
"github.com/prometheus/client_golang/prometheus/testutil"
"github.com/stretchr/testify/require"
)
func TestMetricsVectorsCanBeScraped(t *testing.T) {
reg := prometheus.NewRegistry()
// vectors will only be available in /metrics after a label has been set/incremented so we can't test these in
// TestPrometheusMetricsCanBeScraped as part of the acceptance tests
reg.MustRegister(
DomainsSourceAPIReqTotal,
DomainsSourceAPICallDuration,
ZipFileServingReqTotal,
ZipFileServingReqDuration,
)
handler := promhttp.HandlerFor(reg, promhttp.HandlerOpts{})
testServer := httptest.NewServer(handler)
defer testServer.Close()
DomainsSourceAPICallDuration.WithLabelValues("200").Set(float64(20 * time.Millisecond))
DomainsSourceAPIReqTotal.WithLabelValues("200").Inc()
c, err := DomainsSourceAPIReqTotal.GetMetricWithLabelValues("200")
require.NoError(t, err)
require.Equal(t, float64(1), testutil.ToFloat64(c))
ZipFileServingReqDuration.WithLabelValues("200").Set(float64(20 * time.Millisecond))
ZipFileServingReqTotal.WithLabelValues("200").Inc()
c, err = ZipFileServingReqTotal.GetMetricWithLabelValues("200")
require.NoError(t, err)
require.Equal(t, float64(1), testutil.ToFloat64(c))
metricFamilies, err := reg.Gather()
require.NoError(t, err)
require.Len(t, metricFamilies, 4)
res, err := http.Get(testServer.URL + "/metrics")
require.NoError(t, err)
defer res.Body.Close()
body, _ := ioutil.ReadAll(res.Body)
require.Contains(t, string(body), `gitlab_pages_domains_source_api_requests_total{status_code="200"}`)
require.Contains(t, string(body), `gitlab_pages_domains_source_api_call_duration{status_code="200"}`)
require.Contains(t, string(body), `gitlab_pages_httprange_zip_reader_requests_total{status_code="200"}`)
require.Contains(t, string(body), `gitlab_pages_httprange_zip_reader_requests_duration{status_code="200"}`)
}
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