prometheus/rules/ast/persistence_adapter.go
Matt T. Proud ea54751431 Update import paths to new location.
This repository moved from matttproud/prometheus to
prometheus/prometheus, and all import paths need to be updated.
2013-01-27 18:49:45 +01:00

113 lines
3 KiB
Go

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