/
function.go
92 lines (82 loc) · 2.44 KB
/
function.go
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package pow
import (
"context"
"math"
"strconv"
"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 pow struct {
interfaces.FunctionBase
}
func GetOrder() interfaces.Order {
return interfaces.Any
}
func New(configFile string) []interfaces.FunctionMetadata {
res := make([]interfaces.FunctionMetadata, 0)
f := &pow{}
functions := []string{"pow"}
for _, n := range functions {
res = append(res, interfaces.FunctionMetadata{Name: n, F: f})
}
return res
}
// pow(seriesList,factor)
func (f *pow) Do(ctx context.Context, e parser.Expr, from, until int64, values map[parser.MetricRequest][]*types.MetricData) ([]*types.MetricData, error) {
if e.ArgsLen() < 2 {
return nil, parser.ErrMissingArgument
}
arg, err := helper.GetSeriesArg(ctx, e.Arg(0), from, until, values)
if err != nil {
return nil, err
}
factor, err := e.GetFloatArg(1)
if err != nil {
return nil, err
}
factorStr := strconv.FormatFloat(factor, 'g', -1, 64)
results := make([]*types.MetricData, len(arg))
for j, a := range arg {
r := a.CopyLink()
r.Name = "pow(" + a.Name + "," + factorStr + ")"
r.Values = make([]float64, len(a.Values))
r.Tags["pow"] = factorStr
for i, v := range a.Values {
if math.IsNaN(v) {
r.Values[i] = math.NaN()
} else {
r.Values[i] = math.Pow(v, factor)
}
}
results[j] = r
}
return results, nil
}
// Description is auto-generated description, based on output of https://github.com/graphite-project/graphite-web
func (f *pow) Description() map[string]types.FunctionDescription {
return map[string]types.FunctionDescription{
"pow": {
Description: "Takes one metric or a wildcard seriesList followed by a constant, and raises the datapoint\nby the power of the constant provided at each point.\n\nExample:\n\n.. code-block:: none\n\n &target=pow(Server.instance01.threads.busy,10)\n &target=pow(Server.instance*.threads.busy,10)",
Function: "pow(seriesList, factor)",
Group: "Transform",
Module: "graphite.render.functions",
Name: "pow",
Params: []types.FunctionParam{
{
Name: "seriesList",
Required: true,
Type: types.SeriesList,
},
{
Name: "factor",
Required: true,
Type: types.Float,
},
},
NameChange: true, // name changed
ValuesChange: true, // values changed
},
}
}