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Fix(query-frontend): /label/<name>/values endpoint to use right set of middlewares #6072

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merged 3 commits into from
May 2, 2022
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Fix(query-frontend): /label/<name>/values endpoint to use right set of middlewares #6072

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dc97233
Fix(query-frontend): `/label/<name>/values` endpoint to use right mid…
kavirajk May 2, 2022
7a78768
Remove `unhandledpath` test
kavirajk May 2, 2022
716e79c
Remove unused test helper
kavirajk May 2, 2022
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2 changes: 1 addition & 1 deletion pkg/querier/queryrange/roundtrip.go
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Original file line number Diff line number Diff line change
Expand Up @@ -232,7 +232,7 @@ func getOperation(path string) string {
return QueryRangeOp
case strings.HasSuffix(path, "/series"):
return SeriesOp
case strings.HasSuffix(path, "/labels") || strings.HasSuffix(path, "/label"):
case strings.HasSuffix(path, "/labels") || strings.HasSuffix(path, "/label") || strings.HasSuffix(path, "/values"):
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This function feels a bit flimsy, and could introduce some interesting bugs in the future.
We should refactor this at some point

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Thanks for adding a test!

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@kavirajk kavirajk May 2, 2022 •
edited
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Q: Does anyone know why middeware chain was disabled for /labels/<name>/values endpoint on the query frontend?

We in fact have a test to lock that behaviour.
https://github.com/grafana/loki/blob/main/pkg/querier/queryrange/roundtrip_test.go#L390-L400 (which is the only test failing for this PR)

I wanted this support so that middlewares like metrics.go stats collector can work on this endpoints too. (#5971)

Any thoughts?

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If no protest, I can remove that test!

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I bet it was omitted by mistake

return LabelNamesOp
case strings.HasSuffix(path, "/v1/query"):
return InstantQueryOp
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72 changes: 72 additions & 0 deletions pkg/querier/queryrange/roundtrip_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -16,6 +16,7 @@ import (
"github.com/prometheus/prometheus/model/labels"
"github.com/prometheus/prometheus/promql"
"github.com/prometheus/prometheus/promql/parser"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
"github.com/weaveworks/common/httpgrpc"
"github.com/weaveworks/common/middleware"
Expand Down Expand Up @@ -547,6 +548,77 @@ func TestEntriesLimitWithZeroTripperware(t *testing.T) {
require.NoError(t, err)
}

func Test_getOperation(t *testing.T) {
cases := []struct {
name string
path string
expectedOp string
}{
{
name: "instant_query",
path: "/loki/api/v1/query",
expectedOp: InstantQueryOp,
},
{
name: "range_query_prom",
path: "/prom/query",
expectedOp: QueryRangeOp,
},
{
name: "range_query",
path: "/loki/api/v1/query_range",
expectedOp: QueryRangeOp,
},
{
name: "series_query",
path: "/loki/api/v1/series",
expectedOp: SeriesOp,
},
{
name: "series_query_prom",
path: "/prom/series",
expectedOp: SeriesOp,
},
{
name: "labels_query",
path: "/loki/api/v1/labels",
expectedOp: LabelNamesOp,
},
{
name: "labels_query_prom",
path: "/prom/labels",
expectedOp: LabelNamesOp,
},
{
name: "label_query",
path: "/loki/api/v1/label",
expectedOp: LabelNamesOp,
},
{
name: "labels_query_prom",
path: "/prom/label",
expectedOp: LabelNamesOp,
},
{
name: "label_values_query",
path: "/loki/api/v1/label/__name__/values",
expectedOp: LabelNamesOp,
},
{
name: "label_values_query_prom",
path: "/prom/label/__name__/values",
expectedOp: LabelNamesOp,
},
}

for _, tc := range cases {
t.Run(tc.name, func(t *testing.T) {
got := getOperation(tc.path)
assert.Equal(t, tc.expectedOp, got)
})
}
}

type fakeLimits struct {
maxQueryLength time.Duration
maxQueryParallelism int
Expand Down