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https://github.com/kubernetes-sigs/prometheus-adapter.git
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pkg/naming: fix LabelValuesByName rendering
According to documentation LabelValuesByName is supposed to render "|" separated values. Currently it is returned as a slice per label name. This fixes it Fixes #191
This commit is contained in:
Sergiusz Urbaniak
parent
ff0a50100d
commit
9e072b2b57
2 changed files with 246 additions and 10 deletions
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@ -74,7 +74,7 @@ type metricsQuery struct {
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type queryTemplateArgs struct {
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Series string
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LabelMatchers string
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LabelValuesByName map[string][]string
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LabelValuesByName map[string]string
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GroupBy string
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GroupBySlice []string
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}
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@ -87,7 +87,7 @@ type queryPart struct {
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func (q *metricsQuery) Build(series string, resource schema.GroupResource, namespace string, extraGroupBy []string, names ...string) (prom.Selector, error) {
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var exprs []string
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valuesByName := map[string][]string{}
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valuesByName := map[string]string{}
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if namespace != "" {
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namespaceLbl, err := q.resConverter.LabelForResource(NsGroupResource)
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@ -95,21 +95,23 @@ func (q *metricsQuery) Build(series string, resource schema.GroupResource, names
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return "", err
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}
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exprs = append(exprs, prom.LabelEq(string(namespaceLbl), namespace))
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valuesByName[string(namespaceLbl)] = []string{namespace}
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valuesByName[string(namespaceLbl)] = namespace
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}
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resourceLbl, err := q.resConverter.LabelForResource(resource)
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if err != nil {
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return "", err
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}
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matcher := prom.LabelEq
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targetValue := names[0]
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targetValue := strings.Join(names, "|")
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if len(names) > 1 {
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matcher = prom.LabelMatches
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targetValue = strings.Join(names, "|")
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}
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exprs = append(exprs, matcher(string(resourceLbl), targetValue))
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valuesByName[string(resourceLbl)] = names
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valuesByName[string(resourceLbl)] = targetValue
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groupBy := make([]string, 0, len(extraGroupBy)+1)
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groupBy = append(groupBy, string(resourceLbl))
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@ -191,7 +193,7 @@ func (q *metricsQuery) convertRequirement(requirement labels.Requirement) queryP
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}
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}
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func (q *metricsQuery) processQueryParts(queryParts []queryPart) ([]string, map[string][]string, error) {
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func (q *metricsQuery) processQueryParts(queryParts []queryPart) ([]string, map[string]string, error) {
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// We've take the approach here that if we can't perfectly map their query into a Prometheus
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// query that we should abandon the effort completely.
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// The concern is that if we don't get a perfect match on their query parameters, the query result
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@ -203,8 +205,8 @@ func (q *metricsQuery) processQueryParts(queryParts []queryPart) ([]string, map[
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var exprs []string
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// Contains the list of label values we're targeting, by namespace.
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// e.g. "some_label" => ["value-one", "value-two"]
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valuesByName := map[string][]string{}
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// e.g. "some_label" => "value-one|value-two"
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valuesByName := map[string]string{}
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// Convert our query parts into template arguments.
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for _, qPart := range queryParts {
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@ -231,7 +233,7 @@ func (q *metricsQuery) processQueryParts(queryParts []queryPart) ([]string, map[
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expression := matcher(qPart.labelName, targetValue)
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exprs = append(exprs, expression)
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valuesByName[qPart.labelName] = qPart.values
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valuesByName[qPart.labelName] = strings.Join(qPart.values, "|")
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}
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return exprs, valuesByName, nil
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234
pkg/naming/metrics_query_test.go
Normal file
234
pkg/naming/metrics_query_test.go
Normal file
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@ -0,0 +1,234 @@
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/*
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Copyright 2019 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package naming
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import (
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"fmt"
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"testing"
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prom "github.com/directxman12/k8s-prometheus-adapter/pkg/client"
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pmodel "github.com/prometheus/common/model"
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"k8s.io/apimachinery/pkg/runtime/schema"
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)
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type resourceConverterMock struct {
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namespaced bool
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}
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// ResourcesForSeries is a mock that returns a single group resource,
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// namely the series as a resource itself.
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func (rcm *resourceConverterMock) ResourcesForSeries(series prom.Series) (res []schema.GroupResource, namespaced bool) {
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return []schema.GroupResource{{Resource: series.Name}}, false
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}
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// LabelForResource is a mock that returns the label name,
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// simply by taking the given resource.
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func (rcm *resourceConverterMock) LabelForResource(gr schema.GroupResource) (pmodel.LabelName, error) {
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return pmodel.LabelName(gr.Resource), nil
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}
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func TestBuildSelector(t *testing.T) {
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type checkFunc func(prom.Selector, error) error
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hasError := func(want error) checkFunc {
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return func(_ prom.Selector, got error) error {
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if want != got {
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return fmt.Errorf("got error %v, want %v", got, want)
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}
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return nil
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}
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}
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hasSelector := func(want string) checkFunc {
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return func(got prom.Selector, _ error) error {
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if prom.Selector(want) != got {
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return fmt.Errorf("got selector %q, want %q", got, want)
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}
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return nil
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}
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}
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checks := func(cs ...checkFunc) checkFunc {
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return func(s prom.Selector, e error) error {
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for _, c := range cs {
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if err := c(s, e); err != nil {
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return err
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}
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}
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return nil
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}
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}
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mustNewQuery := func(queryTemplate string, namespaced bool) MetricsQuery {
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mq, err := NewMetricsQuery(queryTemplate, &resourceConverterMock{namespaced})
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if err != nil {
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t.Fatal(err)
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}
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return mq
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}
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tests := []struct {
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name string
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mq MetricsQuery
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series string
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resource schema.GroupResource
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namespace string
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extraGroupBy []string
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names []string
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check checkFunc
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}{
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{
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name: "series",
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mq: mustNewQuery(`series <<.Series>>`, false),
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series: "foo",
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check: checks(
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hasError(nil),
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hasSelector("series foo"),
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),
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},
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{
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name: "multiple LabelMatchers values",
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mq: mustNewQuery(`<<.LabelMatchers>>`, false),
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resource: schema.GroupResource{Group: "group", Resource: "resource"},
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names: []string{"bar", "baz"},
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check: checks(
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hasError(nil),
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hasSelector(`resource=~"bar|baz"`),
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),
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},
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{
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name: "single LabelMatchers value",
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mq: mustNewQuery(`<<.LabelMatchers>>`, false),
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resource: schema.GroupResource{Group: "group", Resource: "resource"},
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names: []string{"bar"},
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check: checks(
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hasError(nil),
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hasSelector(`resource="bar"`),
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),
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},
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{
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name: "single LabelValuesByName value",
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mq: mustNewQuery(`<<index .LabelValuesByName "resource">>`, false),
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resource: schema.GroupResource{Group: "group", Resource: "resource"},
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names: []string{"bar"},
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check: checks(
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hasError(nil),
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hasSelector("bar"),
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),
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},
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{
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name: "multiple LabelValuesByName values",
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mq: mustNewQuery(`<<index .LabelValuesByName "resource">>`, false),
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resource: schema.GroupResource{Group: "group", Resource: "resource"},
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names: []string{"bar", "baz"},
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check: checks(
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hasError(nil),
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hasSelector("bar|baz"),
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),
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},
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{
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name: "multiple LabelValuesByName values with namespace",
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mq: mustNewQuery(`<<index .LabelValuesByName "namespaces">> <<index .LabelValuesByName "resource">>`, true),
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resource: schema.GroupResource{Group: "group", Resource: "resource"},
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namespace: "default",
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names: []string{"bar", "baz"},
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check: checks(
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hasError(nil),
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hasSelector("default bar|baz"),
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),
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},
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{
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name: "single GroupBy value",
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mq: mustNewQuery(`<<.GroupBy>>`, false),
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resource: schema.GroupResource{Group: "group", Resource: "resource"},
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check: checks(
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hasError(nil),
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hasSelector("resource"),
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),
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},
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{
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name: "multiple GroupBySlice values",
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mq: mustNewQuery(`<<.GroupBy>>`, false),
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resource: schema.GroupResource{Group: "group", Resource: "resource"},
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extraGroupBy: []string{"extra", "groups"},
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check: checks(
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hasError(nil),
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hasSelector("resource,extra,groups"),
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),
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},
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{
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name: "single GroupBySlice value",
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mq: mustNewQuery(`<<.GroupBySlice>>`, false),
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resource: schema.GroupResource{Group: "group", Resource: "resource"},
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check: checks(
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hasError(nil),
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hasSelector("[resource]"),
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),
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},
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{
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name: "multiple GroupBy values",
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mq: mustNewQuery(`<<.GroupBySlice>>`, false),
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resource: schema.GroupResource{Group: "group", Resource: "resource"},
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extraGroupBy: []string{"extra", "groups"},
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check: checks(
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hasError(nil),
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hasSelector("[resource extra groups]"),
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),
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},
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}
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for _, tc := range tests {
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t.Run(tc.name, func(t *testing.T) {
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selector, err := tc.mq.Build(tc.series, tc.resource, tc.namespace, tc.extraGroupBy, tc.names...)
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if err := tc.check(selector, err); err != nil {
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t.Error(err)
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}
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})
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}
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}
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