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function.go
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function.go
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package join
import (
"context"
"fmt"
"strings"
"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"
)
const (
and = "AND"
or = "OR"
xor = "XOR"
sub = "SUB"
)
type join struct {
interfaces.FunctionBase
}
func GetOrder() interfaces.Order {
return interfaces.Any
}
func New(_ string) []interfaces.FunctionMetadata {
return []interfaces.FunctionMetadata{
{F: &join{}, Name: "join"},
}
}
func (_ *join) Description() map[string]types.FunctionDescription {
return map[string]types.FunctionDescription{
"join": {
Description: `Performs set operations on 'seriesA' and 'seriesB'. Following options are available:
* AND - returns those metrics from 'seriesA' which are presented in 'seriesB';
* OR - returns all metrics from 'seriesA' and also those metrics from 'seriesB' which aren't presented in 'seriesA';
* XOR - returns only those metrics which are presented in either 'seriesA' or 'seriesB', but not in both;
* SUB - returns those metrics from 'seriesA' which aren't presented in 'seriesB';
Example:
.. code-block:: none
&target=join(some.data.series.aaa, some.other.series.bbb, 'AND')`,
Function: "join(seriesA, seriesB)",
Group: "Transform",
Module: "graphite.render.functions",
Name: "join",
Params: []types.FunctionParam{
{
Name: "seriesA",
Required: true,
Type: types.SeriesList,
},
{
Name: "seriesB",
Required: true,
Type: types.SeriesList,
},
{
Name: "type",
Required: false,
Type: types.String,
Default: types.NewSuggestion(and),
Options: types.StringsToSuggestionList([]string{and, or, xor, sub}),
},
},
SeriesChange: true, // function aggregate metrics or change series items count
NameChange: true, // name changed
TagsChange: true, // name tag changed
ValuesChange: true, // values changed
},
}
}
func (_ *join) Do(ctx context.Context, e parser.Expr, from, until int64, values map[parser.MetricRequest][]*types.MetricData) (results []*types.MetricData, err error) {
seriesA, err := helper.GetSeriesArg(ctx, e.Arg(0), from, until, values)
if err != nil {
return nil, err
}
seriesB, err := helper.GetSeriesArg(ctx, e.Arg(1), from, until, values)
if err != nil {
return nil, err
}
joinType, err := e.GetStringNamedOrPosArgDefault("type", 2, and)
if err != nil {
return nil, err
}
joinType = strings.ToUpper(joinType)
switch joinType {
case and:
return doAnd(seriesA, seriesB), nil
case or:
return doOr(seriesA, seriesB), nil
case xor:
return doXor(seriesA, seriesB), nil
case sub:
return doSub(seriesA, seriesB), nil
default:
return nil, fmt.Errorf("unknown join type: %s", joinType)
}
}
func doAnd(seriesA []*types.MetricData, seriesB []*types.MetricData) (results []*types.MetricData) {
metricsB := make(map[string]bool, len(seriesB))
for _, md := range seriesB {
metricsB[md.Name] = true
}
results = make([]*types.MetricData, 0, len(seriesA))
for _, md := range seriesA {
if metricsB[md.Name] {
results = append(results, md)
}
}
return results
}
func doOr(seriesA []*types.MetricData, seriesB []*types.MetricData) (results []*types.MetricData) {
metricsA := make(map[string]bool, len(seriesA))
for _, md := range seriesA {
metricsA[md.Name] = true
}
results = seriesA
for _, md := range seriesB {
if !metricsA[md.Name] {
results = append(results, md)
}
}
return results
}
func doXor(seriesA []*types.MetricData, seriesB []*types.MetricData) (results []*types.MetricData) {
metricsA := make(map[string]bool, len(seriesA))
for _, md := range seriesA {
metricsA[md.Name] = true
}
metricsB := make(map[string]bool, len(seriesB))
for _, md := range seriesB {
metricsB[md.Name] = true
}
results = make([]*types.MetricData, 0, len(seriesA)+len(seriesB))
for _, md := range seriesA {
if !metricsB[md.Name] {
results = append(results, md)
}
}
for _, md := range seriesB {
if !metricsA[md.Name] {
results = append(results, md)
}
}
return results
}
func doSub(seriesA []*types.MetricData, seriesB []*types.MetricData) (results []*types.MetricData) {
metricsB := make(map[string]bool, len(seriesB))
for _, md := range seriesB {
metricsB[md.Name] = true
}
results = make([]*types.MetricData, 0, len(seriesA))
for _, md := range seriesA {
if !metricsB[md.Name] {
results = append(results, md)
}
}
return results
}