113 lines
3.0 KiB
Go
113 lines
3.0 KiB
Go
package ast
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import (
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"flag"
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"github.com/prometheus/prometheus/model"
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"github.com/prometheus/prometheus/storage/metric"
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"time"
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)
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var defaultStalenessDelta = flag.Int("defaultStalenessDelta", 300, "Default staleness delta allowance in seconds during expression evaluations.")
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type PersistenceAdapter struct {
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persistence metric.MetricPersistence
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stalenessPolicy *metric.StalenessPolicy
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}
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// AST-global persistence to use.
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var persistenceAdapter *PersistenceAdapter = nil
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func (p *PersistenceAdapter) getMetricsWithLabels(labels model.LabelSet) ([]*model.Metric, error) {
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fingerprints, err := p.persistence.GetFingerprintsForLabelSet(&labels)
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if err != nil {
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return nil, err
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}
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metrics := []*model.Metric{}
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for _, fingerprint := range fingerprints {
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metric, err := p.persistence.GetMetricForFingerprint(fingerprint)
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if err != nil {
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return nil, err
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}
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metrics = append(metrics, metric)
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}
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return metrics, nil
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}
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func (p *PersistenceAdapter) GetValueAtTime(labels model.LabelSet, timestamp *time.Time) ([]*model.Sample, error) {
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metrics, err := p.getMetricsWithLabels(labels)
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if err != nil {
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return nil, err
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}
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samples := []*model.Sample{}
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for _, metric := range metrics {
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sample, err := p.persistence.GetValueAtTime(metric, timestamp, p.stalenessPolicy)
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if err != nil {
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return nil, err
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}
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if sample == nil {
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continue
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}
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samples = append(samples, sample)
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}
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return samples, nil
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}
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func (p *PersistenceAdapter) GetBoundaryValues(labels model.LabelSet, interval *model.Interval) ([]*model.SampleSet, error) {
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metrics, err := p.getMetricsWithLabels(labels)
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if err != nil {
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return nil, err
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}
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sampleSets := []*model.SampleSet{}
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for _, metric := range metrics {
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// TODO: change to GetBoundaryValues() once it has the right return type.
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sampleSet, err := p.persistence.GetRangeValues(metric, interval, p.stalenessPolicy)
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if err != nil {
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return nil, err
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}
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if sampleSet == nil {
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continue
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}
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// TODO remove when persistence return value is fixed.
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sampleSet.Metric = *metric
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sampleSets = append(sampleSets, sampleSet)
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}
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return sampleSets, nil
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}
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func (p *PersistenceAdapter) GetRangeValues(labels model.LabelSet, interval *model.Interval) ([]*model.SampleSet, error) {
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metrics, err := p.getMetricsWithLabels(labels)
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if err != nil {
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return nil, err
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}
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sampleSets := []*model.SampleSet{}
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for _, metric := range metrics {
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sampleSet, err := p.persistence.GetRangeValues(metric, interval, p.stalenessPolicy)
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if err != nil {
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return nil, err
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}
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if sampleSet == nil {
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continue
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}
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// TODO remove when persistence return value is fixed.
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sampleSet.Metric = *metric
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sampleSets = append(sampleSets, sampleSet)
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}
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return sampleSets, nil
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}
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func SetPersistence(persistence metric.MetricPersistence, policy *metric.StalenessPolicy) {
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if policy == nil {
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policy = &metric.StalenessPolicy{
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DeltaAllowance: time.Duration(*defaultStalenessDelta) * time.Second,
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}
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}
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persistenceAdapter = &PersistenceAdapter{
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persistence: persistence,
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stalenessPolicy: policy,
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}
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}
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