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labels.go
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labels.go
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package phlaredb
import (
"fmt"
"strings"
"github.com/prometheus/common/model"
profilev1 "github.com/grafana/pyroscope/api/gen/proto/go/google/v1"
typesv1 "github.com/grafana/pyroscope/api/gen/proto/go/types/v1"
phlaremodel "github.com/grafana/pyroscope/pkg/model"
)
var labelNameServiceName = fmt.Sprintf("__%s__", phlaremodel.LabelNameServiceName)
func labelsForProfile(p *profilev1.Profile, externalLabels ...*typesv1.LabelPair) ([]phlaremodel.Labels, []model.Fingerprint) {
// build label set per sample type before references are rewritten
var (
sb strings.Builder
lbls = phlaremodel.NewLabelsBuilder(externalLabels)
sampleType, sampleUnit, periodType, periodUnit string
metricName = phlaremodel.Labels(externalLabels).Get(model.MetricNameLabel)
)
// Inject into labels the __service_name__ label if it exists
// This allows better locality of the data in parquet files (row group are sorted by).
if serviceName := lbls.Labels().Get(phlaremodel.LabelNameServiceName); serviceName != "" {
lbls.Set(labelNameServiceName, serviceName)
}
// set common labels
if p.PeriodType != nil {
periodType = p.StringTable[p.PeriodType.Type]
lbls.Set(phlaremodel.LabelNamePeriodType, periodType)
periodUnit = p.StringTable[p.PeriodType.Unit]
lbls.Set(phlaremodel.LabelNamePeriodUnit, periodUnit)
}
profilesLabels := make([]phlaremodel.Labels, len(p.SampleType))
seriesRefs := make([]model.Fingerprint, len(p.SampleType))
for pos := range p.SampleType {
sampleType = p.StringTable[p.SampleType[pos].Type]
lbls.Set(phlaremodel.LabelNameType, sampleType)
sampleUnit = p.StringTable[p.SampleType[pos].Unit]
lbls.Set(phlaremodel.LabelNameUnit, sampleUnit)
sb.Reset()
_, _ = sb.WriteString(metricName)
_, _ = sb.WriteRune(':')
_, _ = sb.WriteString(sampleType)
_, _ = sb.WriteRune(':')
_, _ = sb.WriteString(sampleUnit)
_, _ = sb.WriteRune(':')
_, _ = sb.WriteString(periodType)
_, _ = sb.WriteRune(':')
_, _ = sb.WriteString(periodUnit)
t := sb.String()
lbls.Set(phlaremodel.LabelNameProfileType, t)
lbs := lbls.Labels().Clone()
profilesLabels[pos] = lbs
seriesRefs[pos] = model.Fingerprint(lbs.Hash())
}
return profilesLabels, seriesRefs
}