/
function.go
87 lines (77 loc) · 2.14 KB
/
function.go
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package nPercentile
import (
"fmt"
"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 nPercentile struct {
interfaces.FunctionBase
}
func GetOrder() interfaces.Order {
return interfaces.Any
}
func New(configFile string) []interfaces.FunctionMetadata {
res := make([]interfaces.FunctionMetadata, 0)
f := &nPercentile{}
functions := []string{"nPercentile"}
for _, n := range functions {
res = append(res, interfaces.FunctionMetadata{Name: n, F: f})
}
return res
}
// nPercentile(seriesList, n)
func (f *nPercentile) Do(e parser.Expr, from, until int32, values map[parser.MetricRequest][]*types.MetricData) ([]*types.MetricData, error) {
arg, 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
}
var results []*types.MetricData
for _, a := range arg {
r := *a
r.Name = fmt.Sprintf("nPercentile(%s,%g)", a.Name, percent)
r.Values = make([]float64, len(a.Values))
r.IsAbsent = make([]bool, len(a.Values))
var values []float64
for i, v := range a.IsAbsent {
if !v {
values = append(values, a.Values[i])
}
}
value := helper.Percentile(values, percent, true)
for i := range r.Values {
r.Values[i] = value
}
results = append(results, &r)
}
return results, nil
}
// Description is auto-generated description, based on output of https://github.com/graphite-project/graphite-web
func (f *nPercentile) Description() map[string]types.FunctionDescription {
return map[string]types.FunctionDescription{
"nPercentile": {
Description: "Returns n-percent of each series in the seriesList.",
Function: "nPercentile(seriesList, n)",
Group: "Calculate",
Module: "graphite.render.functions",
Name: "nPercentile",
Params: []types.FunctionParam{
{
Name: "seriesList",
Required: true,
Type: types.SeriesList,
},
{
Name: "n",
Required: true,
Type: types.Integer,
},
},
},
}
}