prometheus/storage/remote/metadata_watcher_test.go

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// Copyright 2020 The Prometheus 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 remote
import (
"context"
"testing"
"time"
"github.com/pkg/errors"
"github.com/prometheus/common/model"
"github.com/prometheus/prometheus/pkg/textparse"
"github.com/prometheus/prometheus/scrape"
"github.com/stretchr/testify/require"
)
var (
interval = model.Duration(1 * time.Millisecond)
deadline = 1 * time.Millisecond
)
// TestMetaStore satisfies the MetricMetadataStore interface.
// It is used to inject specific metadata as part of a test case.
type TestMetaStore struct {
Metadata []scrape.MetricMetadata
}
func (s *TestMetaStore) ListMetadata() []scrape.MetricMetadata {
return s.Metadata
}
func (s *TestMetaStore) GetMetadata(metric string) (scrape.MetricMetadata, bool) {
for _, m := range s.Metadata {
if metric == m.Metric {
return m, true
}
}
return scrape.MetricMetadata{}, false
}
func (s *TestMetaStore) SizeMetadata() int { return 0 }
func (s *TestMetaStore) LengthMetadata() int { return 0 }
type writeMetadataToMock struct {
metadataAppended int
}
func (mwtm *writeMetadataToMock) AppendMetadata(_ context.Context, m []scrape.MetricMetadata) {
mwtm.metadataAppended += len(m)
}
func newMetadataWriteToMock() *writeMetadataToMock {
return &writeMetadataToMock{}
}
type scrapeManagerMock struct {
manager *scrape.Manager
ready bool
}
func (smm *scrapeManagerMock) Get() (*scrape.Manager, error) {
if smm.ready {
return smm.manager, nil
}
return nil, errors.New("not ready")
}
type fakeManager struct {
activeTargets map[string][]*scrape.Target
}
func (fm *fakeManager) TargetsActive() map[string][]*scrape.Target {
return fm.activeTargets
}
func TestWatchScrapeManager_NotReady(t *testing.T) {
wt := newMetadataWriteToMock()
smm := &scrapeManagerMock{
ready: false,
}
mw := NewMetadataWatcher(nil, smm, "", wt, interval, deadline)
require.Equal(t, false, mw.ready())
mw.collect()
require.Equal(t, 0, wt.metadataAppended)
}
func TestWatchScrapeManager_ReadyForCollection(t *testing.T) {
wt := newMetadataWriteToMock()
metadata := &TestMetaStore{
Metadata: []scrape.MetricMetadata{
{
Metric: "prometheus_tsdb_head_chunks_created_total",
Type: textparse.MetricTypeCounter,
Help: "Total number",
Unit: "",
},
{
Metric: "prometheus_remote_storage_retried_samples_total",
Type: textparse.MetricTypeCounter,
Help: "Total number",
Unit: "",
},
},
}
metadataDup := &TestMetaStore{
Metadata: []scrape.MetricMetadata{
{
Metric: "prometheus_tsdb_head_chunks_created_total",
Type: textparse.MetricTypeCounter,
Help: "Total number",
Unit: "",
},
},
}
target := &scrape.Target{}
target.SetMetadataStore(metadata)
targetWithDup := &scrape.Target{}
targetWithDup.SetMetadataStore(metadataDup)
manager := &fakeManager{
activeTargets: map[string][]*scrape.Target{
"job": {target},
"dup": {targetWithDup},
},
}
smm := &scrapeManagerMock{
ready: true,
}
mw := NewMetadataWatcher(nil, smm, "", wt, interval, deadline)
mw.manager = manager
mw.collect()
require.Equal(t, 2, wt.metadataAppended)
}