prometheus/scrape/helpers_test.go
Vanshika cccbe72514
TSDB: Fix some edge cases when OOO is enabled (#14710)
Fix some edge cases when OOO is enabled

Signed-off-by: Vanshikav123 <vanshikav928@gmail.com>
Signed-off-by: Vanshika <102902652+Vanshikav123@users.noreply.github.com>
Signed-off-by: Jesus Vazquez <jesusvzpg@gmail.com>
Co-authored-by: Jesus Vazquez <jesusvzpg@gmail.com>
2024-10-23 17:34:28 +02:00

253 lines
7.4 KiB
Go

// Copyright 2013 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 scrape
import (
"bytes"
"context"
"encoding/binary"
"fmt"
"math"
"math/rand"
"strings"
"sync"
"testing"
"github.com/gogo/protobuf/proto"
dto "github.com/prometheus/client_model/go"
"github.com/stretchr/testify/require"
"github.com/prometheus/prometheus/model/exemplar"
"github.com/prometheus/prometheus/model/histogram"
"github.com/prometheus/prometheus/model/labels"
"github.com/prometheus/prometheus/model/metadata"
"github.com/prometheus/prometheus/storage"
)
type nopAppendable struct{}
func (a nopAppendable) Appender(_ context.Context) storage.Appender {
return nopAppender{}
}
type nopAppender struct{}
func (a nopAppender) SetOptions(opts *storage.AppendOptions) {}
func (a nopAppender) Append(storage.SeriesRef, labels.Labels, int64, float64) (storage.SeriesRef, error) {
return 0, nil
}
func (a nopAppender) AppendExemplar(storage.SeriesRef, labels.Labels, exemplar.Exemplar) (storage.SeriesRef, error) {
return 0, nil
}
func (a nopAppender) AppendHistogram(storage.SeriesRef, labels.Labels, int64, *histogram.Histogram, *histogram.FloatHistogram) (storage.SeriesRef, error) {
return 0, nil
}
func (a nopAppender) AppendHistogramCTZeroSample(ref storage.SeriesRef, l labels.Labels, t, ct int64, h *histogram.Histogram, fh *histogram.FloatHistogram) (storage.SeriesRef, error) {
return 0, nil
}
func (a nopAppender) UpdateMetadata(storage.SeriesRef, labels.Labels, metadata.Metadata) (storage.SeriesRef, error) {
return 0, nil
}
func (a nopAppender) AppendCTZeroSample(storage.SeriesRef, labels.Labels, int64, int64) (storage.SeriesRef, error) {
return 0, nil
}
func (a nopAppender) Commit() error { return nil }
func (a nopAppender) Rollback() error { return nil }
type floatSample struct {
metric labels.Labels
t int64
f float64
}
func equalFloatSamples(a, b floatSample) bool {
// Compare Float64bits so NaN values which are exactly the same will compare equal.
return labels.Equal(a.metric, b.metric) && a.t == b.t && math.Float64bits(a.f) == math.Float64bits(b.f)
}
type histogramSample struct {
metric labels.Labels
t int64
h *histogram.Histogram
fh *histogram.FloatHistogram
}
type collectResultAppendable struct {
*collectResultAppender
}
func (a *collectResultAppendable) Appender(_ context.Context) storage.Appender {
return a
}
// collectResultAppender records all samples that were added through the appender.
// It can be used as its zero value or be backed by another appender it writes samples through.
type collectResultAppender struct {
mtx sync.Mutex
next storage.Appender
resultFloats []floatSample
pendingFloats []floatSample
rolledbackFloats []floatSample
resultHistograms []histogramSample
pendingHistograms []histogramSample
rolledbackHistograms []histogramSample
resultExemplars []exemplar.Exemplar
pendingExemplars []exemplar.Exemplar
resultMetadata []metadata.Metadata
pendingMetadata []metadata.Metadata
}
func (a *collectResultAppender) SetOptions(opts *storage.AppendOptions) {}
func (a *collectResultAppender) Append(ref storage.SeriesRef, lset labels.Labels, t int64, v float64) (storage.SeriesRef, error) {
a.mtx.Lock()
defer a.mtx.Unlock()
a.pendingFloats = append(a.pendingFloats, floatSample{
metric: lset,
t: t,
f: v,
})
if ref == 0 {
ref = storage.SeriesRef(rand.Uint64())
}
if a.next == nil {
return ref, nil
}
ref, err := a.next.Append(ref, lset, t, v)
if err != nil {
return 0, err
}
return ref, err
}
func (a *collectResultAppender) AppendExemplar(ref storage.SeriesRef, l labels.Labels, e exemplar.Exemplar) (storage.SeriesRef, error) {
a.mtx.Lock()
defer a.mtx.Unlock()
a.pendingExemplars = append(a.pendingExemplars, e)
if a.next == nil {
return 0, nil
}
return a.next.AppendExemplar(ref, l, e)
}
func (a *collectResultAppender) AppendHistogram(ref storage.SeriesRef, l labels.Labels, t int64, h *histogram.Histogram, fh *histogram.FloatHistogram) (storage.SeriesRef, error) {
a.mtx.Lock()
defer a.mtx.Unlock()
a.pendingHistograms = append(a.pendingHistograms, histogramSample{h: h, fh: fh, t: t, metric: l})
if a.next == nil {
return 0, nil
}
return a.next.AppendHistogram(ref, l, t, h, fh)
}
func (a *collectResultAppender) AppendHistogramCTZeroSample(ref storage.SeriesRef, l labels.Labels, t, ct int64, h *histogram.Histogram, fh *histogram.FloatHistogram) (storage.SeriesRef, error) {
if h != nil {
return a.AppendHistogram(ref, l, ct, &histogram.Histogram{}, nil)
}
return a.AppendHistogram(ref, l, ct, nil, &histogram.FloatHistogram{})
}
func (a *collectResultAppender) UpdateMetadata(ref storage.SeriesRef, l labels.Labels, m metadata.Metadata) (storage.SeriesRef, error) {
a.mtx.Lock()
defer a.mtx.Unlock()
a.pendingMetadata = append(a.pendingMetadata, m)
if ref == 0 {
ref = storage.SeriesRef(rand.Uint64())
}
if a.next == nil {
return ref, nil
}
return a.next.UpdateMetadata(ref, l, m)
}
func (a *collectResultAppender) AppendCTZeroSample(ref storage.SeriesRef, l labels.Labels, t, ct int64) (storage.SeriesRef, error) {
return a.Append(ref, l, ct, 0.0)
}
func (a *collectResultAppender) Commit() error {
a.mtx.Lock()
defer a.mtx.Unlock()
a.resultFloats = append(a.resultFloats, a.pendingFloats...)
a.resultExemplars = append(a.resultExemplars, a.pendingExemplars...)
a.resultHistograms = append(a.resultHistograms, a.pendingHistograms...)
a.resultMetadata = append(a.resultMetadata, a.pendingMetadata...)
a.pendingFloats = nil
a.pendingExemplars = nil
a.pendingHistograms = nil
a.pendingMetadata = nil
if a.next == nil {
return nil
}
return a.next.Commit()
}
func (a *collectResultAppender) Rollback() error {
a.mtx.Lock()
defer a.mtx.Unlock()
a.rolledbackFloats = a.pendingFloats
a.rolledbackHistograms = a.pendingHistograms
a.pendingFloats = nil
a.pendingHistograms = nil
if a.next == nil {
return nil
}
return a.next.Rollback()
}
func (a *collectResultAppender) String() string {
var sb strings.Builder
for _, s := range a.resultFloats {
sb.WriteString(fmt.Sprintf("committed: %s %f %d\n", s.metric, s.f, s.t))
}
for _, s := range a.pendingFloats {
sb.WriteString(fmt.Sprintf("pending: %s %f %d\n", s.metric, s.f, s.t))
}
for _, s := range a.rolledbackFloats {
sb.WriteString(fmt.Sprintf("rolledback: %s %f %d\n", s.metric, s.f, s.t))
}
return sb.String()
}
// protoMarshalDelimited marshals a MetricFamily into a delimited
// Prometheus proto exposition format bytes (known as 'encoding=delimited`)
//
// See also https://eli.thegreenplace.net/2011/08/02/length-prefix-framing-for-protocol-buffers
func protoMarshalDelimited(t *testing.T, mf *dto.MetricFamily) []byte {
t.Helper()
protoBuf, err := proto.Marshal(mf)
require.NoError(t, err)
varintBuf := make([]byte, binary.MaxVarintLen32)
varintLength := binary.PutUvarint(varintBuf, uint64(len(protoBuf)))
buf := &bytes.Buffer{}
buf.Write(varintBuf[:varintLength])
buf.Write(protoBuf)
return buf.Bytes()
}