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Scrape: test for q-value compliance with RFC 9110 in Accept header

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Signed-off-by: Julien <roidelapluie@o11y.eu>
This commit is contained in:
Julien 2024-09-06 14:02:44 +02:00
parent 8805301f58
commit 0a88943594
1 changed files with 17 additions and 2 deletions
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19
scrape/scrape_test.go
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@ -34,6 +34,7 @@ import (
"github.com/go-kit/log"
"github.com/gogo/protobuf/proto"
"github.com/google/go-cmp/cmp"
"github.com/grafana/regexp"
"github.com/prometheus/client_golang/prometheus"
prom_testutil "github.com/prometheus/client_golang/prometheus/testutil"
dto "github.com/prometheus/client_model/go"
@ -2379,8 +2380,11 @@ func TestTargetScraperScrapeOK(t *testing.T) {
expectedTimeout = "1.5"
)
var protobufParsing bool
var allowUTF8 bool
var (
protobufParsing bool
allowUTF8 bool
qValuePattern = regexp.MustCompile(`q=([0-9]+(\.\d+)?)`)
)
server := httptest.NewServer(
http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
@ -2393,6 +2397,17 @@ func TestTargetScraperScrapeOK(t *testing.T) {
"Expected Accept header to prefer application/vnd.google.protobuf.")
}
contentTypes := strings.Split(accept, ",")
for _, ct := range contentTypes {
match := qValuePattern.FindStringSubmatch(ct)
require.Len(t, match, 3)
qValue, err := strconv.ParseFloat(match[1], 64)
require.NoError(t, err, "Error parsing q value")
require.GreaterOrEqual(t, qValue, float64(0))
require.LessOrEqual(t, qValue, float64(1))
require.LessOrEqual(t, len(strings.Split(match[1], ".")[1]), 3, "q value should have at most 3 decimal places")
}
timeout := r.Header.Get("X-Prometheus-Scrape-Timeout-Seconds")
require.Equal(t, expectedTimeout, timeout, "Expected scrape timeout header.")