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function.go
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function.go
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package aliasQuery
import (
"context"
"fmt"
"regexp"
"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 aliasQuery struct {
interfaces.FunctionBase
}
func GetOrder() interfaces.Order {
return interfaces.Any
}
func New(_ string) []interfaces.FunctionMetadata {
return []interfaces.FunctionMetadata{
{Name: "aliasQuery", F: &aliasQuery{}},
}
}
func (f *aliasQuery) Do(ctx context.Context, e parser.Expr, from, until int64, values map[parser.MetricRequest][]*types.MetricData) ([]*types.MetricData, error) {
seriesList, err := helper.GetSeriesArg(ctx, e.Arg(0), from, until, values)
if err != nil {
return nil, err
}
search, err := e.GetStringArg(1)
if err != nil {
return nil, err
}
replace, err := e.GetStringArg(2)
if err != nil {
return nil, err
}
newName, err := e.GetStringArg(3)
if err != nil {
return nil, err
}
re, err := regexp.Compile(search)
if err != nil {
return nil, err
}
replace = helper.Backref.ReplaceAllString(replace, "$${$1}")
fetchTargets := make([]parser.Expr, len(seriesList))
for i, series := range seriesList {
newTarget := re.ReplaceAllString(series.Name, replace)
expr, _, err := parser.ParseExpr(newTarget)
if err != nil {
return nil, err
}
fetchTargets[i] = expr
}
targetValues, err := f.GetEvaluator().Fetch(ctx, fetchTargets, from, until, values)
if err != nil {
return nil, err
}
results := make([]*types.MetricData, len(seriesList))
for i, series := range seriesList {
v, err := f.getLastValueOfSeries(ctx, fetchTargets[i], from, until, targetValues)
if err != nil {
return nil, err
}
n := fmt.Sprintf(newName, v)
var r *types.MetricData
if series.Name == n {
r = series.CopyLinkTags()
r.Tags["name"] = r.Name
} else {
r = series.CopyName(n)
}
results[i] = r
}
return results, nil
}
func (f *aliasQuery) getLastValueOfSeries(ctx context.Context, e parser.Expr, from, until int64, targetValues map[parser.MetricRequest][]*types.MetricData) (float64, error) {
res, err := helper.GetSeriesArg(ctx, e, from, until, targetValues)
if err != nil {
return 0, err
}
if len(res) == 0 {
return 0, parser.ErrMissingTimeseries
}
if len(res[0].Values) == 0 {
return 0, parser.ErrMissingValues
}
return res[0].Values[len(res[0].Values)-1], nil
}
func (f *aliasQuery) Description() map[string]types.FunctionDescription {
return map[string]types.FunctionDescription{
"aliasQuery": {
Description: "Performs a query to alias the metrics in seriesList.\nThe series in seriesList will be aliased by first translating the series names using the search & replace parameters, then using the last value of the resulting series to construct the alias using sprintf-style syntax.",
Function: "aliasQuery(seriesList, search, replace, newName)",
Group: "Alias",
Module: "graphite.render.functions",
Name: "aliasQuery",
Params: []types.FunctionParam{
{
Name: "seriesList",
Required: true,
Type: types.SeriesList,
},
{
Name: "search",
Required: true,
Type: types.String,
},
{
Name: "replace",
Required: true,
Type: types.String,
},
{
Name: "newName",
Required: true,
Type: types.String,
},
},
NameChange: true,
TagsChange: true,
},
}
}