mirror of
https://github.com/prometheus/prometheus.git
synced 2024-11-14 09:34:05 -08:00
334 lines
8.7 KiB
Go
334 lines
8.7 KiB
Go
// Copyright 2013 Prometheus Team
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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package metric
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import (
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"github.com/prometheus/prometheus/model"
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"github.com/prometheus/prometheus/storage"
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"github.com/prometheus/prometheus/utility"
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"github.com/ryszard/goskiplist/skiplist"
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"time"
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)
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// Models a given sample entry stored in the in-memory arena.
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type value interface {
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// Gets the given value.
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get() model.SampleValue
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}
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// Models a single sample value. It presumes that there is either no subsequent
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// value seen or that any subsequent values are of a different value.
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type singletonValue model.SampleValue
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func (v singletonValue) get() model.SampleValue {
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return model.SampleValue(v)
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}
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type skipListTime time.Time
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func (t skipListTime) LessThan(o skiplist.Ordered) bool {
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return time.Time(o.(skipListTime)).Before(time.Time(t))
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}
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type stream struct {
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metric model.Metric
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values *skiplist.SkipList
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}
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func (s *stream) add(timestamp time.Time, value model.SampleValue) {
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s.values.Set(skipListTime(timestamp), singletonValue(value))
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}
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func (s *stream) forEach(decoder storage.RecordDecoder, filter storage.RecordFilter, operator storage.RecordOperator) (scannedEntireCorpus bool, err error) {
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if s.values.Len() == 0 {
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return false, nil
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}
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iterator := s.values.SeekToLast()
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defer iterator.Close()
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for !(iterator.Key() == nil || iterator.Value() == nil) {
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decodedKey, decodeErr := decoder.DecodeKey(iterator.Key())
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if decodeErr != nil {
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panic(decodeErr)
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}
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decodedValue, decodeErr := decoder.DecodeValue(iterator.Value())
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if decodeErr != nil {
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panic(decodeErr)
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}
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switch filter.Filter(decodedKey, decodedValue) {
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case storage.STOP:
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return false, nil
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case storage.SKIP:
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continue
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case storage.ACCEPT:
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opErr := operator.Operate(decodedKey, decodedValue)
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if opErr != nil {
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if opErr.Continuable {
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continue
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}
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break
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}
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}
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if !iterator.Previous() {
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break
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}
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}
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return true, nil
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}
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func newStream(metric model.Metric) *stream {
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return &stream{
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values: skiplist.New(),
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metric: metric,
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}
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}
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type memorySeriesStorage struct {
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fingerprintToSeries map[model.Fingerprint]*stream
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labelPairToFingerprints map[model.LabelPair]model.Fingerprints
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labelNameToFingerprints map[model.LabelName]model.Fingerprints
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}
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func (s *memorySeriesStorage) AppendSamples(samples model.Samples) error {
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for _, sample := range samples {
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s.AppendSample(sample)
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}
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return nil
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}
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func (s *memorySeriesStorage) AppendSample(sample model.Sample) error {
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metric := sample.Metric
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fingerprint := model.NewFingerprintFromMetric(metric)
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series, ok := s.fingerprintToSeries[fingerprint]
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if !ok {
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series = newStream(metric)
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s.fingerprintToSeries[fingerprint] = series
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for k, v := range metric {
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labelPair := model.LabelPair{
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Name: k,
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Value: v,
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}
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labelPairValues := s.labelPairToFingerprints[labelPair]
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labelPairValues = append(labelPairValues, fingerprint)
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s.labelPairToFingerprints[labelPair] = labelPairValues
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labelNameValues := s.labelNameToFingerprints[k]
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labelNameValues = append(labelNameValues, fingerprint)
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s.labelNameToFingerprints[k] = labelNameValues
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}
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}
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series.add(sample.Timestamp, sample.Value)
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return nil
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}
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// Append raw sample, bypassing indexing. Only used to add data to views, which
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// don't need to lookup by metric.
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func (s *memorySeriesStorage) appendSampleWithoutIndexing(f model.Fingerprint, timestamp time.Time, value model.SampleValue) {
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series, ok := s.fingerprintToSeries[f]
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if !ok {
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series = newStream(model.Metric{})
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s.fingerprintToSeries[f] = series
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}
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series.add(timestamp, value)
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}
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func (s *memorySeriesStorage) GetFingerprintsForLabelSet(l model.LabelSet) (fingerprints model.Fingerprints, err error) {
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sets := []utility.Set{}
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for k, v := range l {
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values := s.labelPairToFingerprints[model.LabelPair{
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Name: k,
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Value: v,
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}]
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set := utility.Set{}
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for _, fingerprint := range values {
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set.Add(fingerprint)
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}
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sets = append(sets, set)
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}
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setCount := len(sets)
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if setCount == 0 {
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return fingerprints, nil
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}
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base := sets[0]
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for i := 1; i < setCount; i++ {
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base = base.Intersection(sets[i])
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}
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for _, e := range base.Elements() {
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fingerprint := e.(model.Fingerprint)
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fingerprints = append(fingerprints, fingerprint)
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}
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return fingerprints, nil
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}
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func (s *memorySeriesStorage) GetFingerprintsForLabelName(l model.LabelName) (fingerprints model.Fingerprints, _ error) {
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values := s.labelNameToFingerprints[l]
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fingerprints = append(fingerprints, values...)
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return fingerprints, nil
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}
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func (s *memorySeriesStorage) GetMetricForFingerprint(f model.Fingerprint) (model.Metric, error) {
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series, ok := s.fingerprintToSeries[f]
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if !ok {
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return nil, nil
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}
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metric := model.Metric{}
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for label, value := range series.metric {
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metric[label] = value
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}
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return metric, nil
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}
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func (s *memorySeriesStorage) GetValueAtTime(f model.Fingerprint, t time.Time) (samples model.Values) {
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series, ok := s.fingerprintToSeries[f]
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if !ok {
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return samples
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}
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iterator := series.values.Seek(skipListTime(t))
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if iterator == nil {
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// If the iterator is nil, it means we seeked past the end of the series,
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// so we seek to the last value instead. Due to the reverse ordering
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// defined on skipListTime, this corresponds to the sample with the
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// earliest timestamp.
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iterator = series.values.SeekToLast()
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if iterator == nil {
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// The list is empty.
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return samples
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}
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}
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defer iterator.Close()
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if iterator.Key() == nil || iterator.Value() == nil {
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return samples
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}
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foundTime := time.Time(iterator.Key().(skipListTime))
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samples = append(samples, model.SamplePair{
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Timestamp: foundTime,
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Value: iterator.Value().(value).get(),
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})
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if foundTime.Before(t) && iterator.Previous() {
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samples = append(samples, model.SamplePair{
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Timestamp: time.Time(iterator.Key().(skipListTime)),
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Value: iterator.Value().(value).get(),
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})
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}
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return samples
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}
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func (s *memorySeriesStorage) GetBoundaryValues(f model.Fingerprint, i model.Interval) (model.Values, model.Values) {
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return s.GetValueAtTime(f, i.OldestInclusive), s.GetValueAtTime(f, i.NewestInclusive)
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}
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func (s *memorySeriesStorage) GetRangeValues(f model.Fingerprint, i model.Interval) (samples model.Values) {
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series, ok := s.fingerprintToSeries[f]
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if !ok {
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return samples
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}
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iterator := series.values.Seek(skipListTime(i.OldestInclusive))
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if iterator == nil {
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// If the iterator is nil, it means we seeked past the end of the series,
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// so we seek to the last value instead. Due to the reverse ordering
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// defined on skipListTime, this corresponds to the sample with the
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// earliest timestamp.
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iterator = series.values.SeekToLast()
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if iterator == nil {
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// The list is empty.
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return samples
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}
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}
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defer iterator.Close()
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for {
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timestamp := time.Time(iterator.Key().(skipListTime))
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if timestamp.After(i.NewestInclusive) {
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break
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}
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if !timestamp.Before(i.OldestInclusive) {
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samples = append(samples, model.SamplePair{
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Value: iterator.Value().(value).get(),
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Timestamp: timestamp,
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})
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}
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if !iterator.Previous() {
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break
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}
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}
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return samples
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}
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func (s *memorySeriesStorage) Close() {
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s.fingerprintToSeries = map[model.Fingerprint]*stream{}
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s.labelPairToFingerprints = map[model.LabelPair]model.Fingerprints{}
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s.labelNameToFingerprints = map[model.LabelName]model.Fingerprints{}
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}
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func (s *memorySeriesStorage) GetAllValuesForLabel(labelName model.LabelName) (values model.LabelValues, err error) {
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valueSet := map[model.LabelValue]bool{}
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for _, series := range s.fingerprintToSeries {
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if value, ok := series.metric[labelName]; ok {
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if !valueSet[value] {
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values = append(values, value)
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valueSet[value] = true
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}
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}
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}
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return
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}
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func (s *memorySeriesStorage) ForEachSample(builder IteratorsForFingerprintBuilder) (err error) {
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for _, stream := range s.fingerprintToSeries {
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decoder, filter, operator := builder.ForStream(stream)
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stream.forEach(decoder, filter, operator)
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}
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return
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}
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func NewMemorySeriesStorage() *memorySeriesStorage {
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return &memorySeriesStorage{
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fingerprintToSeries: make(map[model.Fingerprint]*stream),
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labelPairToFingerprints: make(map[model.LabelPair]model.Fingerprints),
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labelNameToFingerprints: make(map[model.LabelName]model.Fingerprints),
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}
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}
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