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helper.go
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helper.go
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package helper
import (
"context"
"fmt"
"math"
"regexp"
"strings"
"github.com/go-graphite/carbonapi/expr/interfaces"
"github.com/go-graphite/carbonapi/expr/types"
"github.com/go-graphite/carbonapi/pkg/parser"
)
var evaluator interfaces.Evaluator
// Backref is a pre-compiled expression for backref
var Backref = regexp.MustCompile(`\\(\d+)`)
// ErrUnknownFunction is an error message about unknown function
type ErrUnknownFunction string
func (e ErrUnknownFunction) Error() string {
return fmt.Sprintf("unknown function in evalExpr: %q", string(e))
}
// SetEvaluator sets evaluator for all helper functions
func SetEvaluator(e interfaces.Evaluator) {
evaluator = e
}
// GetSeriesArg returns argument from series.
func GetSeriesArg(ctx context.Context, arg parser.Expr, from, until int64, values map[parser.MetricRequest][]*types.MetricData) ([]*types.MetricData, error) {
if !arg.IsName() && !arg.IsFunc() {
return nil, parser.ErrMissingTimeseries
}
a, err := evaluator.Eval(ctx, arg, from, until, values)
if err != nil {
return nil, err
}
return a, nil
}
// RemoveEmptySeriesFromName removes empty series from list of names.
func RemoveEmptySeriesFromName(args []*types.MetricData) string {
var argNames []string
for _, arg := range args {
argNames = append(argNames, arg.Name)
}
return strings.Join(argNames, ",")
}
// GetSeriesArgs returns arguments of series
func GetSeriesArgs(ctx context.Context, e []parser.Expr, from, until int64, values map[parser.MetricRequest][]*types.MetricData) ([]*types.MetricData, error) {
var args []*types.MetricData
for _, arg := range e {
a, err := GetSeriesArg(ctx, arg, from, until, values)
if err != nil {
return nil, err
}
args = append(args, a...)
}
if len(args) == 0 {
return nil, nil
}
return args, nil
}
// GetSeriesArgsAndRemoveNonExisting will fetch all required arguments, but will also filter out non existing Series
// This is needed to be graphite-web compatible in cases when you pass non-existing Series to, for example, sumSeries
func GetSeriesArgsAndRemoveNonExisting(ctx context.Context, e parser.Expr, from, until int64, values map[parser.MetricRequest][]*types.MetricData) ([]*types.MetricData, error) {
args, err := GetSeriesArgs(ctx, e.Args(), from, until, values)
if err != nil {
return nil, err
}
// We need to rewrite name if there are some missing metrics
if len(args) < e.ArgsLen() {
e.SetRawArgs(RemoveEmptySeriesFromName(args))
}
return args, nil
}
// AggKey returns joined by dot nodes of tags names
func AggKey(arg *types.MetricData, nodesOrTags []parser.NodeOrTag) string {
matched := make([]string, 0, len(nodesOrTags))
metricTags := arg.Tags
name := types.ExtractNameTag(arg.Name)
nodes := strings.Split(name, ".")
for _, nt := range nodesOrTags {
if nt.IsTag {
tagStr := nt.Value.(string)
matched = append(matched, metricTags[tagStr])
} else {
f := nt.Value.(int)
if f < 0 {
f += len(nodes)
}
if f >= len(nodes) || f < 0 {
continue
}
matched = append(matched, nodes[f])
}
}
if len(matched) > 0 {
return strings.Join(matched, ".")
}
return ""
}
type seriesFunc1 func(*types.MetricData) *types.MetricData
// ForEachSeriesDo do action for each serie in list.
func ForEachSeriesDo1(ctx context.Context, e parser.Expr, from, until int64, values map[parser.MetricRequest][]*types.MetricData, function seriesFunc1) ([]*types.MetricData, error) {
arg, err := GetSeriesArg(ctx, e.Arg(0), from, until, values)
if err != nil {
return nil, parser.ErrMissingTimeseries
}
var results []*types.MetricData
for _, a := range arg {
results = append(results, function(a))
}
return results, nil
}
type seriesFunc func(*types.MetricData, *types.MetricData) *types.MetricData
// ForEachSeriesDo do action for each serie in list.
func ForEachSeriesDo(ctx context.Context, e parser.Expr, from, until int64, values map[parser.MetricRequest][]*types.MetricData, function seriesFunc) ([]*types.MetricData, error) {
arg, err := GetSeriesArg(ctx, e.Arg(0), from, until, values)
if err != nil {
return nil, parser.ErrMissingTimeseries
}
var results []*types.MetricData
for _, a := range arg {
r := a.CopyName(e.Target() + "(" + a.Name + ")")
r.Values = make([]float64, len(a.Values))
results = append(results, function(a, r))
}
return results, nil
}
// AggregateFunc type that defined aggregate function
type AggregateFunc func([]float64) float64
// AggregateSeries aggregates series
func AggregateSeries(e parser.Expr, args []*types.MetricData, function AggregateFunc, xFilesFactor float64, extractTagsFromArgs bool) ([]*types.MetricData, error) {
if len(args) == 0 {
// GraphiteWeb does this, no matter the function
// https://github.com/graphite-project/graphite-web/blob/b52987ac97f49dcfb401a21d4b92860cfcbcf074/webapp/graphite/render/functions.py#L228
return args, nil
}
var applyXFilesFactor = xFilesFactor >= 0
args = ScaleSeries(args)
length := len(args[0].Values)
r := args[0].CopyNameArg(e.Target()+"("+e.RawArgs()+")", e.Target(), GetCommonTags(args), extractTagsFromArgs)
r.Values = make([]float64, length)
if _, ok := r.Tags["name"]; !ok {
r.Tags["name"] = r.Name
}
values := make([]float64, len(args))
for i := range args[0].Values {
for n, arg := range args {
values[n] = arg.Values[i]
}
r.Values[i] = math.NaN()
if len(values) > 0 {
if applyXFilesFactor && XFilesFactorValues(values, xFilesFactor) {
r.Values[i] = function(values)
} else {
r.Values[i] = function(values)
}
}
}
return []*types.MetricData{r}, nil
}
// Contains check if slice 'a' contains value 'i'
func Contains(a []int, i int) bool {
for _, aa := range a {
if aa == i {
return true
}
}
return false
}
// CopyTags makes a deep copy of the tags
func CopyTags(series *types.MetricData) map[string]string {
out := make(map[string]string, len(series.Tags))
for k, v := range series.Tags {
out[k] = v
}
return out
}
func GetCommonTags(series []*types.MetricData) map[string]string {
if len(series) == 0 {
return make(map[string]string)
}
commonTags := CopyTags(series[0])
for _, serie := range series {
for k, v := range commonTags {
if serie.Tags[k] != v {
delete(commonTags, k)
}
}
}
return commonTags
}
func SafeRound(x float64, precision int) float64 {
if math.IsNaN(x) {
return x
}
roundTo := math.Pow10(precision)
return math.RoundToEven(x*roundTo) / roundTo
}
func XFilesFactorValues(values []float64, xFilesFactor float64) bool {
if math.IsNaN(xFilesFactor) || xFilesFactor == 0 {
return true
}
nonNull := 0
for _, val := range values {
if !math.IsNaN(val) {
nonNull++
}
}
return XFilesFactor(nonNull, len(values), xFilesFactor)
}
func XFilesFactor(nonNull int, total int, xFilesFactor float64) bool {
if nonNull < 0 || total <= 0 {
return false
}
return float64(nonNull)/float64(total) >= xFilesFactor
}
type unitPrefix struct {
prefix string
size uint64
}
const floatEpsilon = 0.00000000001
const (
unitSystemBinary = "binary"
unitSystemSI = "si"
)
var UnitSystems = map[string][]unitPrefix{
unitSystemBinary: {
{"Pi", 1125899906842624}, // 1024^5
{"Ti", 1099511627776}, // 1024^4
{"Gi", 1073741824}, // 1024^3
{"Mi", 1048576}, // 1024^2
{"Ki", 1024},
},
unitSystemSI: {
{"P", 1000000000000000}, // 1000^5
{"T", 1000000000000}, // 1000^4
{"G", 1000000000}, // 1000^3
{"M", 1000000}, // 1000^2
{"K", 1000},
},
}
// formatUnits formats the given value according to the given unit prefix system
func FormatUnits(v float64, system string) (float64, string) {
unitsystem := UnitSystems[system]
for _, p := range unitsystem {
fsize := float64(p.size)
if math.Abs(v) >= fsize {
v2 := v / fsize
if (v2-math.Floor(v2)) < floatEpsilon && v > 1 {
v2 = math.Floor(v2)
}
return v2, p.prefix
}
}
if (v-math.Floor(v)) < floatEpsilon && v > 1 {
v = math.Floor(v)
}
return v, ""
}