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reducer.go
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reducer.go
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package conditions
import (
"math"
"github.com/grafana/grafana/pkg/tsdb"
"gopkg.in/guregu/null.v3"
)
type QueryReducer interface {
Reduce(timeSeries *tsdb.TimeSeries) null.Float
}
type SimpleReducer struct {
Type string
}
func (s *SimpleReducer) Reduce(series *tsdb.TimeSeries) null.Float {
if len(series.Points) == 0 {
return null.FloatFromPtr(nil)
}
value := float64(0)
allNull := true
switch s.Type {
case "avg":
for _, point := range series.Points {
if point[0].Valid {
value += point[0].Float64
allNull = false
}
}
value = value / float64(len(series.Points))
case "sum":
for _, point := range series.Points {
if point[0].Valid {
value += point[0].Float64
allNull = false
}
}
case "min":
value = math.MaxFloat64
for _, point := range series.Points {
if point[0].Valid {
allNull = false
if value > point[0].Float64 {
value = point[0].Float64
}
}
}
case "max":
value = -math.MaxFloat64
for _, point := range series.Points {
if point[0].Valid {
allNull = false
if value < point[0].Float64 {
value = point[0].Float64
}
}
}
case "count":
value = float64(len(series.Points))
allNull = false
case "last":
points := series.Points
for i := len(points) - 1; i >= 0; i-- {
if points[i][0].Valid {
value = points[i][0].Float64
allNull = false
break
}
}
}
if allNull {
return null.FloatFromPtr(nil)
}
return null.FloatFrom(value)
}
func NewSimpleReducer(typ string) *SimpleReducer {
return &SimpleReducer{Type: typ}
}