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querier.go
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querier.go
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package persistence
import (
"context"
"errors"
"fmt"
"sort"
"time"
"github.com/cloudfoundry/metric-store-release/src/internal/metrics"
"github.com/cloudfoundry/metric-store-release/src/pkg/persistence/transform"
"github.com/prometheus/prometheus/model/labels"
"github.com/prometheus/prometheus/storage"
)
type Querier struct {
ctx context.Context
adapter *InfluxAdapter
metrics metrics.Registrar
}
func NewQuerier(ctx context.Context, adapter *InfluxAdapter, metrics metrics.Registrar) *Querier {
return &Querier{
ctx: ctx,
adapter: adapter,
metrics: metrics,
}
}
func (q *Querier) Select(sortSeries bool, params *storage.SelectHints, labelMatchers ...*labels.Matcher) storage.SeriesSet {
if params == nil {
params = &storage.SelectHints{
Start: 0,
End: time.Now().UnixNano() / int64(time.Millisecond),
}
}
if params.End != 0 && params.Start > params.End {
return storage.ErrSeriesSet(fmt.Errorf("Start (%d) must be before End (%d)",
params.Start, params.End))
}
if params.End == 0 {
params.End = time.Now().UnixNano() / int64(time.Millisecond)
}
var name string
for index, labelMatcher := range labelMatchers {
if labelMatcher.Name == labels.MetricName {
if labelMatcher.Type != labels.MatchEqual {
return storage.ErrSeriesSet(errors.New("only strict equality is " +
"supported for metric names"))
}
name = labelMatcher.Value
labelMatchers = append(labelMatchers[:index], labelMatchers[index+1:]...)
break
}
}
startTimeInNanoseconds := transform.MillisecondsToNanoseconds(params.Start)
endTimeInNanoseconds := transform.MillisecondsToNanoseconds(params.End) - 1
builder, err := q.adapter.GetPoints(q.ctx, name, startTimeInNanoseconds, endTimeInNanoseconds, labelMatchers)
if err != nil {
q.metrics.Inc(metrics.MetricStoreReadErrorsTotal)
return storage.ErrSeriesSet(err)
}
return builder.SeriesSet()
}
func (q *Querier) LabelNames(matchers ...*labels.Matcher) ([]string, storage.Warnings, error) {
distinctKeys := make(map[string]struct{})
tagKeys := q.adapter.AllTagKeys(q.ctx)
for _, tagKey := range tagKeys {
distinctKeys[tagKey] = struct{}{}
}
var labelNames []string
for k := range distinctKeys {
labelNames = append(labelNames, k)
}
labelNames = append(labelNames, labels.MetricName)
sort.Strings(labelNames)
return labelNames, nil, nil
}
func (q *Querier) LabelValues(name string, matchers ...*labels.Matcher) ([]string, storage.Warnings, error) {
distinctValues := make(map[string]struct{})
if name == labels.MetricName {
values := q.adapter.AllMeasurementNames()
return values, nil, nil
}
tagValues := q.adapter.AllTagValues(q.ctx, name)
for _, tagValue := range tagValues {
distinctValues[tagValue] = struct{}{}
}
var values []string
for v := range distinctValues {
values = append(values, v)
}
sort.Strings(values)
return values, nil, nil
}
func (q *Querier) Close() error {
return nil
}