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function.go
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function.go
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package percentileOfSeries
import (
"github.com/bookingcom/carbonapi/expr/helper"
"github.com/bookingcom/carbonapi/expr/interfaces"
"github.com/bookingcom/carbonapi/expr/types"
"github.com/bookingcom/carbonapi/pkg/parser"
)
type percentileOfSeries struct {
interfaces.FunctionBase
}
func GetOrder() interfaces.Order {
return interfaces.Any
}
func New(configFile string) []interfaces.FunctionMetadata {
res := make([]interfaces.FunctionMetadata, 0)
f := &percentileOfSeries{}
functions := []string{"percentileOfSeries"}
for _, n := range functions {
res = append(res, interfaces.FunctionMetadata{Name: n, F: f})
}
return res
}
// percentileOfSeries(seriesList, n, interpolate=False)
func (f *percentileOfSeries) Do(e parser.Expr, from, until int32, values map[parser.MetricRequest][]*types.MetricData) ([]*types.MetricData, error) {
// TODO(dgryski): make sure the arrays are all the same 'size'
args, err := helper.GetSeriesArg(e.Args()[0], from, until, values)
if err != nil {
return nil, err
}
percent, err := e.GetFloatArg(1)
if err != nil {
return nil, err
}
interpolate, err := e.GetBoolNamedOrPosArgDefault("interpolate", 2, false)
if err != nil {
return nil, err
}
return helper.AggregateSeries(e, args, func(values []float64) float64 {
return helper.Percentile(values, percent, interpolate)
})
}
// Description is auto-generated description, based on output of https://github.com/graphite-project/graphite-web
func (f *percentileOfSeries) Description() map[string]types.FunctionDescription {
return map[string]types.FunctionDescription{
"percentileOfSeries": {
Description: "percentileOfSeries returns a single series which is composed of the n-percentile\nvalues taken across a wildcard series at each point. Unless `interpolate` is\nset to True, percentile values are actual values contained in one of the\nsupplied series.",
Function: "percentileOfSeries(seriesList, n, interpolate=False)",
Group: "Combine",
Module: "graphite.render.functions",
Name: "percentileOfSeries",
Params: []types.FunctionParam{
{
Name: "seriesList",
Required: true,
Type: types.SeriesList,
},
{
Name: "n",
Required: true,
Type: types.Integer,
},
{
Default: types.NewSuggestion(false),
Name: "interpolate",
Type: types.Boolean,
},
},
},
}
}