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expression.go
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expression.go
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package prometheus_adapter
import (
"bytes"
"fmt"
"regexp"
"strings"
"text/template"
"k8s.io/apimachinery/pkg/api/meta"
"k8s.io/apimachinery/pkg/runtime/schema"
"sigs.k8s.io/prometheus-adapter/pkg/config"
"sigs.k8s.io/prometheus-adapter/pkg/naming"
)
// MetricMatches for Prometheus-adapter-config
const (
WorkloadCpuUsageExpression = "WorkloadCpuUsageExpression"
WorkloadMemUsageExpression = "WorkloadMemUsageExpression"
NodeCpuUsageExpression = "NodeCpuUsageExpression"
NodeMemUsageExpression = "NodeMemUsageExpression"
ContainerCpuUsageExpression = "ContainerCpuUsageExpression"
ContainerMemUsageExpression = "ContainerMemUsageExpression"
PodCpuUsageExpression = "PodCpuUsageExpression"
PodMemUsageExpression = "PodMemUsageExpression"
)
// define MetricRule for expressionQuery, SeriesName for original metric name, MetricName for name converted by prometheus-adapter
var (
metricRules *MetricRules
)
func init() {
metricRules = &MetricRules{}
}
type MetricRules struct {
MetricRulesResource []MetricRule
MetricRulesCustomer []MetricRule
MetricRulesExternal []MetricRule
ExtensionLabels []string
}
type MetricRule struct {
MetricMatches string
SeriesName string
ResConverter naming.ResourceConverter
Template *template.Template
Namespaced bool
LabelMatchers []string
}
type QueryTemplateArgs struct {
Series string
LabelMatchers string
}
// get MetricRules from config.MetricsDiscoveryConfig
func GetMetricRules() *MetricRules {
return metricRules
}
// ParsingResourceRules from config.MetricsDiscoveryConfig
func ParsingResourceRules(mc config.MetricsDiscoveryConfig, mapper meta.RESTMapper) (err error) {
metricRules.MetricRulesResource, err = GetMetricRulesFromResourceRules(*mc.ResourceRules, mapper)
return err
}
// ParsingRules from config.MetricsDiscoveryConfig
func ParsingRules(mc config.MetricsDiscoveryConfig, mapper meta.RESTMapper) (err error) {
if mc.Rules == nil {
return fmt.Errorf("Rules is nil")
} else {
metricRules.MetricRulesCustomer, err = GetMetricRulesFromDiscoveryRule(mc.Rules, mapper)
}
return err
}
// ParsingExternalRules from config.MetricsDiscoveryConfig
func ParsingExternalRules(mc config.MetricsDiscoveryConfig, mapper meta.RESTMapper) (err error) {
if mc.ExternalRules == nil {
return fmt.Errorf("ExternalRules is nil")
} else {
metricRules.MetricRulesExternal, err = GetMetricRulesFromDiscoveryRule(mc.ExternalRules, mapper)
}
return err
}
// SetExtensionLabels from opts.DataSourcePromConfig.AdapterExtensionLabels
func SetExtensionLabels(extensionLabels string) {
if extensionLabels != "" {
for _, label := range strings.Split(extensionLabels, ",") {
metricRules.ExtensionLabels = append(metricRules.ExtensionLabels, label)
}
}
}
// GetMetricRuleResourceFromRules produces a MetricNamer for each rule in the given config.
func GetMetricRulesFromResourceRules(cfg config.ResourceRules, mapper meta.RESTMapper) (metricRules []MetricRule, err error) {
// get cpu MetricsQuery
if cfg.CPU.ContainerQuery != "" {
var resConverter naming.ResourceConverter
if cfg.CPU.Resources.Overrides != nil {
resConverter, err = naming.NewResourceConverter(cfg.CPU.Resources.Template, cfg.CPU.Resources.Overrides, mapper)
if err != nil {
return nil, fmt.Errorf("unable to construct label-resource converter: %s %v", "resource.cpu", err)
}
}
reg, err := regexp.Compile(`\s*by\s*\(<<.GroupBy>>\)\s*$`)
if err != nil {
return nil, fmt.Errorf("unable to match <.GroupBy>")
}
queryTemplate := reg.ReplaceAllString(cfg.CPU.ContainerQuery, "")
templ, err := template.New("metrics-query").Delims("<<", ">>").Parse(queryTemplate)
if err != nil {
return nil, fmt.Errorf("unable to parse metrics query template %q: %v", cfg.CPU.ContainerQuery, err)
}
metricRules = append(metricRules, MetricRule{
MetricMatches: "cpu",
ResConverter: resConverter,
Template: templ,
Namespaced: true,
})
}
// get cpu MetricsQuery
if cfg.Memory.ContainerQuery != "" {
var resConverter naming.ResourceConverter
if cfg.Memory.Resources.Overrides != nil {
resConverter, err = naming.NewResourceConverter(cfg.Memory.Resources.Template, cfg.Memory.Resources.Overrides, mapper)
if err != nil {
return nil, fmt.Errorf("unable to construct label-resource converter: %s %v", "resource.memory", err)
}
}
reg, err := regexp.Compile(`\s*by\s*\(<<.GroupBy>>\)\s*$`)
if err != nil {
return nil, fmt.Errorf("unable to match <.GroupBy>")
}
queryTemplate := reg.ReplaceAllString(cfg.Memory.ContainerQuery, "")
templ, err := template.New("metrics-query").Delims("<<", ">>").Parse(queryTemplate)
if err != nil {
return nil, fmt.Errorf("unable to parse metrics query template %q: %v", cfg.Memory.ContainerQuery, err)
}
metricRules = append(metricRules, MetricRule{
MetricMatches: "memory",
ResConverter: resConverter,
Template: templ,
Namespaced: true,
})
}
return metricRules, nil
}
// GetMetricRuleFromRules produces a MetricNamer for each rule in the given config.
func GetMetricRulesFromDiscoveryRule(cfg []config.DiscoveryRule, mapper meta.RESTMapper) ([]MetricRule, error) {
metricRules := make([]MetricRule, len(cfg))
var err error
for i, rule := range cfg {
var resConverter naming.ResourceConverter
if rule.Resources.Overrides != nil {
resConverter, err = naming.NewResourceConverter(rule.Resources.Template, rule.Resources.Overrides, mapper)
if err != nil {
return nil, fmt.Errorf("unable to construct label-resource converter: %s %v", rule.SeriesQuery, err)
}
}
// queries are namespaced by default unless the rule specifically disables it
namespaced := true
if rule.Resources.Namespaced != nil {
namespaced = *rule.Resources.Namespaced
}
reg, err := regexp.Compile(`\s*by\s*\(<<.GroupBy>>\)\s*$`)
if err != nil {
return nil, fmt.Errorf("unable to match <.GroupBy>")
}
queryTemplate := reg.ReplaceAllString(rule.MetricsQuery, "")
templ, err := template.New("metrics-query").Delims("<<", ">>").Parse(queryTemplate)
if err != nil {
return nil, fmt.Errorf("unable to parse metrics query template %q: %v", queryTemplate, err)
}
// get seriesName from SeriesQuery
seriesName := GetSeriesNameFromSeriesQuery(rule.SeriesQuery)
// get labelMatchers from DiscoveryRule
labelMatchers := GetLabelMatchersFromDiscoveryRule(rule)
// get metricMatches from DiscoveryRule
metricMatches, err := GetMetricMatchesFromDiscoveryRule(rule)
if err != nil {
return metricRules, err
}
if metricMatches == "" {
return metricRules, fmt.Errorf("unable to get metricMatches with DiscoveryRule %v", rule)
}
metricRules[i] = MetricRule{
MetricMatches: metricMatches,
SeriesName: seriesName,
LabelMatchers: labelMatchers,
ResConverter: resConverter,
Template: templ,
Namespaced: namespaced,
}
}
return metricRules, nil
}
// get MetricRule for metricName
func MatchMetricRule(mrs []MetricRule, metricName string) *MetricRule {
for _, metricRule := range mrs {
if match, _ := (regexp.Match(metricRule.MetricMatches, []byte(metricName))); match {
return &metricRule
}
}
return nil
}
// get MetrycsQuery by naming.MetricsQuery.BuildExternal from prometheus-adapter
func (mr *MetricRule) QueryForSeries(namespace string, nameReg string, exprs []string) (expressionQuery string, err error) {
if mr.LabelMatchers != nil {
exprs = append(mr.LabelMatchers, exprs...)
}
if mr.Namespaced && namespace != "" {
if mr.ResConverter != nil {
namespaceLbl, err := mr.ResConverter.LabelForResource(naming.NsGroupResource)
if err != nil {
return "", err
}
exprs = append(exprs, fmt.Sprintf("%s=\"%s\"", namespaceLbl, namespace))
} else {
exprs = append(exprs, fmt.Sprintf("%s=\"%s\"", "namespace", namespace))
}
}
if nameReg != "" {
if mr.ResConverter != nil {
resourceLbl, err := mr.ResConverter.LabelForResource(schema.GroupResource{Resource: "pods"})
if err != nil {
return "", err
}
exprs = append(exprs, fmt.Sprintf("%s=~\"%s\"", resourceLbl, nameReg))
} else {
exprs = append(exprs, fmt.Sprintf("%s=~\"%s\"", "pod", nameReg))
}
}
args := &QueryTemplateArgs{
Series: mr.SeriesName,
LabelMatchers: strings.Join(exprs, ","),
}
queryBuff := new(bytes.Buffer)
if err := mr.Template.Execute(queryBuff, args); err != nil {
return "", err
}
if queryBuff.Len() == 0 {
return "", fmt.Errorf("empty query produced by metrics query template")
}
return queryBuff.String(), err
}
// get SeriesName from SeriesQuery
func GetSeriesNameFromSeriesQuery(seriesQuery string) (seriesName string) {
regSeriesName := regexp.MustCompile("(.*){.*}")
if len(regSeriesName.FindStringSubmatch(seriesQuery)) > 1 {
seriesName = regSeriesName.FindStringSubmatch(seriesQuery)[1]
} else {
seriesName = seriesQuery
}
return seriesName
}
// get labelMatchers from DiscoveryRule
func GetLabelMatchersFromDiscoveryRule(rule config.DiscoveryRule) []string {
var labelMatchers []string
if GetSeriesNameFromSeriesQuery(rule.SeriesQuery) == "" {
// add Name Matches
if rule.Name.Matches != "" {
labelMatchers = append(labelMatchers, fmt.Sprintf("__name__=~\"%s\"", rule.Name.Matches))
}
// add SeriesFilters
if len(rule.SeriesFilters) > 0 {
for _, f := range rule.SeriesFilters {
if f.Is != "" {
labelMatchers = append(labelMatchers, fmt.Sprintf("__name__=~\"%s\"", f.Is))
}
if f.IsNot != "" {
labelMatchers = append(labelMatchers, fmt.Sprintf("__name__!~\"%s\"", f.IsNot))
}
}
}
}
// add SeriesQueryLabels
regLabelMatchers := regexp.MustCompile("{(.*?)}")
if len(regLabelMatchers.FindStringSubmatch(rule.SeriesQuery)) > 1 {
SeriesMatchers := regLabelMatchers.FindStringSubmatch(rule.SeriesQuery)[1]
if SeriesMatchers != "" {
for _, seriesMatcher := range strings.Split(SeriesMatchers, ",") {
labelMatchers = append(labelMatchers, seriesMatcher)
}
}
}
return labelMatchers
}
// get MetricMatches from DiscoveryRule
func GetMetricMatchesFromDiscoveryRule(rule config.DiscoveryRule) (metricMatches string, err error) {
seriesName := GetSeriesNameFromSeriesQuery(rule.SeriesQuery)
if seriesName == "" {
regLabelName := regexp.MustCompile("__name__[~|=]+\"(.*?)\"")
if len(regLabelName.FindStringSubmatch(rule.SeriesQuery)) > 1 {
seriesName = regLabelName.FindStringSubmatch(rule.SeriesQuery)[1]
} else {
return metricMatches, fmt.Errorf("unable to get [%s] from series query %q", "__name__", rule.SeriesQuery)
}
}
var nameMatches *regexp.Regexp
if rule.Name.Matches != "" {
nameMatches, err = regexp.Compile(rule.Name.Matches)
if err != nil {
return metricMatches, fmt.Errorf("unable to compile series name match expression %q associated with series query %q: %v", rule.Name.Matches, rule.SeriesQuery, err)
}
} else {
// this will always succeed
nameMatches = regexp.MustCompile(".*")
}
nameAs := rule.Name.As
if nameAs == "" {
// check if we have an obvious default
subexpNames := nameMatches.SubexpNames()
if len(subexpNames) == 1 {
// no capture groups, use the whole thing
nameAs = "$0"
} else if len(subexpNames) == 2 {
// one capture group, use that
nameAs = "$1"
} else {
return metricMatches, fmt.Errorf("must specify an 'as' value for name matcher %q associated with series query %q", rule.Name.Matches, rule.SeriesQuery)
}
}
// get MetricName
matches := nameMatches.FindStringSubmatchIndex(seriesName)
if matches == nil {
return metricMatches, fmt.Errorf("series name %q did not match expected pattern %q", seriesName, nameMatches.String())
}
outNameBytes := nameMatches.ExpandString(nil, nameAs, seriesName, matches)
return string(outNameBytes), err
}