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metrics_batch.go
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/
metrics_batch.go
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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
package exporterhelper // import "go.opentelemetry.io/collector/exporter/exporterhelper"
import (
"context"
"errors"
"go.opentelemetry.io/collector/exporter/exporterbatcher"
"go.opentelemetry.io/collector/pdata/pmetric"
)
// mergeMetrics merges two metrics requests into one.
func mergeMetrics(_ context.Context, r1 Request, r2 Request) (Request, error) {
mr1, ok1 := r1.(*metricsRequest)
mr2, ok2 := r2.(*metricsRequest)
if !ok1 || !ok2 {
return nil, errors.New("invalid input type")
}
mr2.md.ResourceMetrics().MoveAndAppendTo(mr1.md.ResourceMetrics())
return mr1, nil
}
// mergeSplitMetrics splits and/or merges the metrics into multiple requests based on the MaxSizeConfig.
func mergeSplitMetrics(_ context.Context, cfg exporterbatcher.MaxSizeConfig, r1 Request, r2 Request) ([]Request, error) {
var (
res []Request
destReq *metricsRequest
capacityLeft = cfg.MaxSizeItems
)
for _, req := range []Request{r1, r2} {
if req == nil {
continue
}
srcReq, ok := req.(*metricsRequest)
if !ok {
return nil, errors.New("invalid input type")
}
if srcReq.md.DataPointCount() <= capacityLeft {
if destReq == nil {
destReq = srcReq
} else {
srcReq.md.ResourceMetrics().MoveAndAppendTo(destReq.md.ResourceMetrics())
}
capacityLeft -= destReq.md.DataPointCount()
continue
}
for {
extractedMetrics := extractMetrics(srcReq.md, capacityLeft)
if extractedMetrics.DataPointCount() == 0 {
break
}
capacityLeft -= extractedMetrics.DataPointCount()
if destReq == nil {
destReq = &metricsRequest{md: extractedMetrics, pusher: srcReq.pusher}
} else {
extractedMetrics.ResourceMetrics().MoveAndAppendTo(destReq.md.ResourceMetrics())
}
// Create new batch once capacity is reached.
if capacityLeft == 0 {
res = append(res, destReq)
destReq = nil
capacityLeft = cfg.MaxSizeItems
}
}
}
if destReq != nil {
res = append(res, destReq)
}
return res, nil
}
// extractMetrics extracts metrics from srcMetrics until count of data points is reached.
func extractMetrics(srcMetrics pmetric.Metrics, count int) pmetric.Metrics {
destMetrics := pmetric.NewMetrics()
srcMetrics.ResourceMetrics().RemoveIf(func(srcRM pmetric.ResourceMetrics) bool {
if count == 0 {
return false
}
needToExtract := resourceDataPointsCount(srcRM) > count
if needToExtract {
srcRM = extractResourceMetrics(srcRM, count)
}
count -= resourceDataPointsCount(srcRM)
srcRM.MoveTo(destMetrics.ResourceMetrics().AppendEmpty())
return !needToExtract
})
return destMetrics
}
// extractResourceMetrics extracts resource metrics and returns a new resource metrics with the specified number of data points.
func extractResourceMetrics(srcRM pmetric.ResourceMetrics, count int) pmetric.ResourceMetrics {
destRM := pmetric.NewResourceMetrics()
destRM.SetSchemaUrl(srcRM.SchemaUrl())
srcRM.Resource().CopyTo(destRM.Resource())
srcRM.ScopeMetrics().RemoveIf(func(srcSM pmetric.ScopeMetrics) bool {
if count == 0 {
return false
}
needToExtract := scopeDataPointsCount(srcSM) > count
if needToExtract {
srcSM = extractScopeMetrics(srcSM, count)
}
count -= scopeDataPointsCount(srcSM)
srcSM.MoveTo(destRM.ScopeMetrics().AppendEmpty())
return !needToExtract
})
return destRM
}
// extractScopeMetrics extracts scope metrics and returns a new scope metrics with the specified number of data points.
func extractScopeMetrics(srcSM pmetric.ScopeMetrics, count int) pmetric.ScopeMetrics {
destSM := pmetric.NewScopeMetrics()
destSM.SetSchemaUrl(srcSM.SchemaUrl())
srcSM.Scope().CopyTo(destSM.Scope())
srcSM.Metrics().RemoveIf(func(srcMetric pmetric.Metric) bool {
if count == 0 {
return false
}
needToExtract := metricDataPointCount(srcMetric) > count
if needToExtract {
srcMetric = extractMetricDataPoints(srcMetric, count)
}
count -= metricDataPointCount(srcMetric)
srcMetric.MoveTo(destSM.Metrics().AppendEmpty())
return !needToExtract
})
return destSM
}
func extractMetricDataPoints(srcMetric pmetric.Metric, count int) pmetric.Metric {
destMetric := pmetric.NewMetric()
switch srcMetric.Type() {
case pmetric.MetricTypeGauge:
extractGaugeDataPoints(srcMetric.Gauge(), count, destMetric.SetEmptyGauge())
case pmetric.MetricTypeSum:
extractSumDataPoints(srcMetric.Sum(), count, destMetric.SetEmptySum())
case pmetric.MetricTypeHistogram:
extractHistogramDataPoints(srcMetric.Histogram(), count, destMetric.SetEmptyHistogram())
case pmetric.MetricTypeExponentialHistogram:
extractExponentialHistogramDataPoints(srcMetric.ExponentialHistogram(), count,
destMetric.SetEmptyExponentialHistogram())
case pmetric.MetricTypeSummary:
extractSummaryDataPoints(srcMetric.Summary(), count, destMetric.SetEmptySummary())
}
return destMetric
}
func extractGaugeDataPoints(srcGauge pmetric.Gauge, count int, destGauge pmetric.Gauge) {
srcGauge.DataPoints().RemoveIf(func(srcDP pmetric.NumberDataPoint) bool {
if count == 0 {
return false
}
srcDP.MoveTo(destGauge.DataPoints().AppendEmpty())
count--
return true
})
}
func extractSumDataPoints(srcSum pmetric.Sum, count int, destSum pmetric.Sum) {
srcSum.DataPoints().RemoveIf(func(srcDP pmetric.NumberDataPoint) bool {
if count == 0 {
return false
}
srcDP.MoveTo(destSum.DataPoints().AppendEmpty())
count--
return true
})
}
func extractHistogramDataPoints(srcHistogram pmetric.Histogram, count int, destHistogram pmetric.Histogram) {
srcHistogram.DataPoints().RemoveIf(func(srcDP pmetric.HistogramDataPoint) bool {
if count == 0 {
return false
}
srcDP.MoveTo(destHistogram.DataPoints().AppendEmpty())
count--
return true
})
}
func extractExponentialHistogramDataPoints(srcExponentialHistogram pmetric.ExponentialHistogram, count int, destExponentialHistogram pmetric.ExponentialHistogram) {
srcExponentialHistogram.DataPoints().RemoveIf(func(srcDP pmetric.ExponentialHistogramDataPoint) bool {
if count == 0 {
return false
}
srcDP.MoveTo(destExponentialHistogram.DataPoints().AppendEmpty())
count--
return true
})
}
func extractSummaryDataPoints(srcSummary pmetric.Summary, count int, destSummary pmetric.Summary) {
srcSummary.DataPoints().RemoveIf(func(srcDP pmetric.SummaryDataPoint) bool {
if count == 0 {
return false
}
srcDP.MoveTo(destSummary.DataPoints().AppendEmpty())
count--
return true
})
}
func resourceDataPointsCount(rm pmetric.ResourceMetrics) (count int) {
for i := 0; i < rm.ScopeMetrics().Len(); i++ {
count += scopeDataPointsCount(rm.ScopeMetrics().At(i))
}
return count
}
func scopeDataPointsCount(sm pmetric.ScopeMetrics) (count int) {
for i := 0; i < sm.Metrics().Len(); i++ {
count += metricDataPointCount(sm.Metrics().At(i))
}
return count
}
func metricDataPointCount(m pmetric.Metric) int {
switch m.Type() {
case pmetric.MetricTypeGauge:
return m.Gauge().DataPoints().Len()
case pmetric.MetricTypeSum:
return m.Sum().DataPoints().Len()
case pmetric.MetricTypeHistogram:
return m.Histogram().DataPoints().Len()
case pmetric.MetricTypeExponentialHistogram:
return m.ExponentialHistogram().DataPoints().Len()
case pmetric.MetricTypeSummary:
return m.Summary().DataPoints().Len()
}
return 0
}