mirror of
https://github.com/kubernetes-sigs/prometheus-adapter.git
synced 2026-04-06 17:57:51 +00:00
a94494337e
* Wiped out a ton of warnings about comments. * Created consts for `MetricType` values. * `externalInfoMap` can now track multiple series with the same name/namespace and different labels. * `namespace` parameter of external metrics queries is now respected (albeit very rudimentarily) * Metric converter values for external metrics are now converted the same way as for custom metrics (probably still some opportunity for consolidation). * Lots of TODOs actually done. * Deleted a lot of commented out code.
63 lines
1.9 KiB
Go
63 lines
1.9 KiB
Go
package provider
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import (
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"fmt"
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"regexp"
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prom "github.com/directxman12/k8s-prometheus-adapter/pkg/client"
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"github.com/directxman12/k8s-prometheus-adapter/pkg/config"
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)
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//MetricNameConverter provides functions for naming custom metrics from Promethes series.
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type MetricNameConverter interface {
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GetMetricNameForSeries(series prom.Series) (string, error)
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}
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type metricNameConverter struct {
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nameMatches *regexp.Regexp
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nameAs string
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}
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//NewMetricNameConverter creates a MetricNameConverter capable of translating Prometheus series names
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//into custom metric names.
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func NewMetricNameConverter(mapping config.NameMapping) (MetricNameConverter, error) {
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var nameMatches *regexp.Regexp
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var err error
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if mapping.Matches != "" {
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nameMatches, err = regexp.Compile(mapping.Matches)
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if err != nil {
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return nil, fmt.Errorf("unable to compile series name match expression %q: %v", mapping.Matches, err)
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}
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} else {
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// this will always succeed
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nameMatches = regexp.MustCompile(".*")
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}
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nameAs := mapping.As
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if nameAs == "" {
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// check if we have an obvious default
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subexpNames := nameMatches.SubexpNames()
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if len(subexpNames) == 1 {
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// no capture groups, use the whole thing
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nameAs = "$0"
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} else if len(subexpNames) == 2 {
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// one capture group, use that
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nameAs = "$1"
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} else {
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return nil, fmt.Errorf("must specify an 'as' value for name matcher %q", mapping.Matches)
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}
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}
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return &metricNameConverter{
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nameMatches: nameMatches,
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nameAs: nameAs,
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}, nil
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}
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func (c *metricNameConverter) GetMetricNameForSeries(series prom.Series) (string, error) {
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matches := c.nameMatches.FindStringSubmatchIndex(series.Name)
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if matches == nil {
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return "", fmt.Errorf("series name %q did not match expected pattern %q", series.Name, c.nameMatches.String())
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}
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outNameBytes := c.nameMatches.ExpandString(nil, c.nameAs, series.Name, matches)
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return string(outNameBytes), nil
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}
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