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Extract fake Prometheus client impl

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This extracts the fake prometheus client for use across different tests.
This commit is contained in:
Solly Ross 2018-10-01 15:21:27 -04:00
parent cc08a1fb41
commit 49287fecc9
2 changed files with 82 additions and 57 deletions
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77
pkg/client/fake/client.go Normal file
View file

@ -0,0 +1,77 @@
/*
Copyright 2018 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package fake
import (
"context"
"fmt"
prom "github.com/directxman12/k8s-prometheus-adapter/pkg/client"
pmodel "github.com/prometheus/common/model"
)
// FakePrometheusClient is a fake instance of prom.Client
type FakePrometheusClient struct {
// AcceptableInterval is the interval in which to return queries
AcceptableInterval pmodel.Interval
// ErrQueries are queries that result in an error (whether from Query or Series)
ErrQueries map[prom.Selector]error
// Series are non-error responses to partial Series calls
SeriesResults map[prom.Selector][]prom.Series
// QueryResults are non-error responses to Query
QueryResults map[prom.Selector]prom.QueryResult
}
func (c *FakePrometheusClient) Series(_ context.Context, interval pmodel.Interval, selectors ...prom.Selector) ([]prom.Series, error) {
if (interval.Start != 0 && interval.Start < c.AcceptableInterval.Start) || (interval.End != 0 && interval.End > c.AcceptableInterval.End) {
return nil, fmt.Errorf("interval [%v, %v] for query is outside range [%v, %v]", interval.Start, interval.End, c.AcceptableInterval.Start, c.AcceptableInterval.End)
}
res := []prom.Series{}
for _, sel := range selectors {
if err, found := c.ErrQueries[sel]; found {
return nil, err
}
if series, found := c.SeriesResults[sel]; found {
res = append(res, series...)
}
}
return res, nil
}
func (c *FakePrometheusClient) Query(_ context.Context, t pmodel.Time, query prom.Selector) (prom.QueryResult, error) {
if t < c.AcceptableInterval.Start || t > c.AcceptableInterval.End {
return prom.QueryResult{}, fmt.Errorf("time %v for query is outside range [%v, %v]", t, c.AcceptableInterval.Start, c.AcceptableInterval.End)
}
if err, found := c.ErrQueries[query]; found {
return prom.QueryResult{}, err
}
if res, found := c.QueryResults[query]; found {
return res, nil
}
return prom.QueryResult{
Type: pmodel.ValVector,
Vector: &pmodel.Vector{},
}, nil
}
func (c *FakePrometheusClient) QueryRange(_ context.Context, r prom.Range, query prom.Selector) (prom.QueryResult, error) {
return prom.QueryResult{}, nil
}

62
pkg/custom-provider/provider_test.go
View file

@ -17,8 +17,6 @@ limitations under the License.
package provider
import (
"context"
"fmt"
"time"
"github.com/kubernetes-incubator/custom-metrics-apiserver/pkg/provider"
@ -29,64 +27,14 @@ import (
config "github.com/directxman12/k8s-prometheus-adapter/cmd/config-gen/utils"
prom "github.com/directxman12/k8s-prometheus-adapter/pkg/client"
fakeprom "github.com/directxman12/k8s-prometheus-adapter/pkg/client/fake"
pmodel "github.com/prometheus/common/model"
)
const fakeProviderUpdateInterval = 2 * time.Second
// fakePromClient is a fake instance of prom.Client
type fakePromClient struct {
// acceptibleInterval is the interval in which to return queries
acceptibleInterval pmodel.Interval
// errQueries are queries that result in an error (whether from Query or Series)
errQueries map[prom.Selector]error
// series are non-error responses to partial Series calls
series map[prom.Selector][]prom.Series
// queryResults are non-error responses to Query
queryResults map[prom.Selector]prom.QueryResult
}
func (c *fakePromClient) Series(_ context.Context, interval pmodel.Interval, selectors ...prom.Selector) ([]prom.Series, error) {
if (interval.Start != 0 && interval.Start < c.acceptibleInterval.Start) || (interval.End != 0 && interval.End > c.acceptibleInterval.End) {
return nil, fmt.Errorf("interval [%v, %v] for query is outside range [%v, %v]", interval.Start, interval.End, c.acceptibleInterval.Start, c.acceptibleInterval.End)
}
res := []prom.Series{}
for _, sel := range selectors {
if err, found := c.errQueries[sel]; found {
return nil, err
}
if series, found := c.series[sel]; found {
res = append(res, series...)
}
}
return res, nil
}
func (c *fakePromClient) Query(_ context.Context, t pmodel.Time, query prom.Selector) (prom.QueryResult, error) {
if t < c.acceptibleInterval.Start || t > c.acceptibleInterval.End {
return prom.QueryResult{}, fmt.Errorf("time %v for query is outside range [%v, %v]", t, c.acceptibleInterval.Start, c.acceptibleInterval.End)
}
if err, found := c.errQueries[query]; found {
return prom.QueryResult{}, err
}
if res, found := c.queryResults[query]; found {
return res, nil
}
return prom.QueryResult{
Type: pmodel.ValVector,
Vector: &pmodel.Vector{},
}, nil
}
func (c *fakePromClient) QueryRange(_ context.Context, r prom.Range, query prom.Selector) (prom.QueryResult, error) {
return prom.QueryResult{}, nil
}
func setupPrometheusProvider() (provider.CustomMetricsProvider, *fakePromClient) {
fakeProm := &fakePromClient{}
func setupPrometheusProvider() (provider.CustomMetricsProvider, *fakeprom.FakePrometheusClient) {
fakeProm := &fakeprom.FakePrometheusClient{}
fakeKubeClient := &fakedyn.FakeDynamicClient{}
cfg := config.DefaultConfig(1*time.Minute, "")
@ -97,7 +45,7 @@ func setupPrometheusProvider() (provider.CustomMetricsProvider, *fakePromClient)
containerSel := prom.MatchSeries("", prom.NameMatches("^container_.*"), prom.LabelNeq("container_name", "POD"), prom.LabelNeq("namespace", ""), prom.LabelNeq("pod_name", ""))
namespacedSel := prom.MatchSeries("", prom.LabelNeq("namespace", ""), prom.NameNotMatches("^container_.*"))
fakeProm.series = map[prom.Selector][]prom.Series{
fakeProm.SeriesResults = map[prom.Selector][]prom.Series{
containerSel: {
{
Name: "container_some_usage",
@ -137,7 +85,7 @@ var _ = Describe("Custom Metrics Provider", func() {
By("setting the acceptible interval to now until the next update, with a bit of wiggle room")
startTime := pmodel.Now().Add(-1*fakeProviderUpdateInterval - fakeProviderUpdateInterval/10)
fakeProm.acceptibleInterval = pmodel.Interval{Start: startTime, End: 0}
fakeProm.AcceptableInterval = pmodel.Interval{Start: startTime, End: 0}
By("updating the list of available metrics")
// don't call RunUntil to avoid timing issue