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function.go
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function.go
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package powSeries
import (
"context"
"math"
"github.com/go-graphite/carbonapi/expr/helper"
"github.com/go-graphite/carbonapi/expr/interfaces"
"github.com/go-graphite/carbonapi/expr/types"
"github.com/go-graphite/carbonapi/pkg/parser"
)
type powSeries struct {
interfaces.FunctionBase
}
func GetOrder() interfaces.Order {
return interfaces.Any
}
func New(_ string) []interfaces.FunctionMetadata {
res := make([]interfaces.FunctionMetadata, 0)
f := &powSeries{}
functions := []string{"powSeries"}
for _, n := range functions {
res = append(res, interfaces.FunctionMetadata{Name: n, F: f})
}
return res
}
func (f *powSeries) Do(ctx context.Context, e parser.Expr, from, until int64, values map[parser.MetricRequest][]*types.MetricData) ([]*types.MetricData, error) {
series, err := helper.GetSeriesArgs(ctx, e.Args(), from, until, values)
if err != nil {
return nil, err
}
overallLength := -1
largestSeriesIdx := -1
for i, s := range series {
l := len(s.GetValues())
if l > overallLength {
overallLength = l
largestSeriesIdx = i
}
}
r := series[largestSeriesIdx].CopyName("powSeries(" + e.RawArgs() + ")")
r.Values = make([]float64, 0)
seriesValues := make([][]float64, 0, len(series))
for _, s := range series {
seriesValues = append(seriesValues, s.GetValues())
}
for i := 0; i < overallLength; i++ {
first := true
var result float64
for _, vals := range seriesValues {
var val float64
if i < len(vals) {
val = vals[i]
} else {
val = math.NaN()
}
if first {
result = val
first = false
} else {
result = math.Pow(result, val)
}
}
if math.IsInf(result, 0) {
result = math.NaN()
}
r.Values = append(r.Values, result)
}
return []*types.MetricData{r}, nil
}
func (f *powSeries) Description() map[string]types.FunctionDescription {
return map[string]types.FunctionDescription{
"powSeries": {
Description: "Takes two or more series and pows their points. A constant line may be used.",
Function: "powSeries(*seriesLists)",
Group: "Combine",
Module: "graphite.render.functions",
Name: "powSeries",
Params: []types.FunctionParam{
{
Multiple: true,
Name: "seriesLists",
Required: true,
Type: types.SeriesList,
},
},
},
}
}