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function.go
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function.go
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package exp
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 exp struct {
interfaces.FunctionBase
}
// offset(seriesList,factor)
func GetOrder() interfaces.Order {
return interfaces.Any
}
func New(configFile string) []interfaces.FunctionMetadata {
res := make([]interfaces.FunctionMetadata, 0)
f := &exp{}
for _, n := range []string{"exp"} {
res = append(res, interfaces.FunctionMetadata{Name: n, F: f})
}
return res
}
func (f *exp) Do(ctx context.Context, e parser.Expr, from, until int64, values map[parser.MetricRequest][]*types.MetricData) ([]*types.MetricData, error) {
args, err := helper.GetSeriesArg(ctx, e.Arg(0), from, until, values)
if err != nil {
return nil, err
}
var results []*types.MetricData
for _, a := range args {
r := a.CopyLink()
r.Name = "exp(" + a.Name + ")"
r.Values = make([]float64, len(a.Values))
r.Tags["exp"] = "e"
for i, v := range a.Values {
if math.IsNaN(v) {
r.Values[i] = math.NaN()
} else {
r.Values[i] = math.Exp(v)
}
}
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 *exp) Description() map[string]types.FunctionDescription {
return map[string]types.FunctionDescription{
"exp": {
Description: "Raise e to the power of the datapoint, where e = 2.718281… is the base of natural logarithms.\n\nExample:\n\n.. code-block:: none\n\n &target=exp(Server.instance01.threads.busy)",
Function: "exp(seriesList)",
Group: "Transform",
Module: "graphite.render.functions",
Name: "exp",
Params: []types.FunctionParam{
{
Name: "seriesList",
Required: true,
Type: types.SeriesList,
},
},
},
}
}