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lib/promscrape: add promrelabel.GetLabelValueByName helper function

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This commit is contained in:
Aliaksandr Valialkin 2020-04-14 14:11:54 +03:00
parent 3945bf9dec
commit 636e1578de
3 changed files with 21 additions and 20 deletions
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11
lib/promrelabel/relabel.go
View file

@ -280,3 +280,14 @@ func GetLabelByName(labels []prompbmarshal.Label, name string) *prompbmarshal.La
} }
return nil return nil
} }
// GetLabelValueByName returns value for label with the given name from labels.
//
// It returns empty string for non-existing label.
func GetLabelValueByName(labels []prompbmarshal.Label, name string) string {
label := GetLabelByName(labels, name)
if label == nil {
return ""
}
return label.Value
}

24
lib/promscrape/config.go
View file

@ -191,11 +191,11 @@ func (cfg *Config) getFileSDScrapeWork(prev []ScrapeWork) []ScrapeWork {
swPrev := make(map[string][]ScrapeWork) swPrev := make(map[string][]ScrapeWork)
for i := range prev { for i := range prev {
sw := &prev[i] sw := &prev[i]
label := promrelabel.GetLabelByName(sw.Labels, "__vm_filepath") filepath := promrelabel.GetLabelValueByName(sw.Labels, "__vm_filepath")
if label == nil { if len(filepath) == 0 {
logger.Panicf("BUG: missing `__vm_filepath` label") logger.Panicf("BUG: missing `__vm_filepath` label")
} else { } else {
swPrev[label.Value] = append(swPrev[label.Value], *sw) swPrev[filepath] = append(swPrev[filepath], *sw)
} }
} }
var dst []ScrapeWork var dst []ScrapeWork
@ -439,27 +439,21 @@ func appendScrapeWork(dst []ScrapeWork, swc *scrapeWorkConfig, target string, ex
return dst, nil return dst, nil
} }
// See https://www.robustperception.io/life-of-a-label // See https://www.robustperception.io/life-of-a-label
schemeRelabeled := "" schemeRelabeled := promrelabel.GetLabelValueByName(labels, "__scheme__")
if schemeLabel := promrelabel.GetLabelByName(labels, "__scheme__"); schemeLabel != nil { if len(schemeRelabeled) == 0 {
schemeRelabeled = schemeLabel.Value
}
if schemeRelabeled == "" {
schemeRelabeled = "http" schemeRelabeled = "http"
} }
addressLabel := promrelabel.GetLabelByName(labels, "__address__") addressRelabeled := promrelabel.GetLabelValueByName(labels, "__address__")
if addressLabel == nil || addressLabel.Name == "" { if len(addressRelabeled) == 0 {
// Drop target without scrape address. // Drop target without scrape address.
return dst, nil return dst, nil
} }
targetRelabeled := addMissingPort(schemeRelabeled, addressLabel.Value) targetRelabeled := addMissingPort(schemeRelabeled, addressRelabeled)
if strings.Contains(targetRelabeled, "/") { if strings.Contains(targetRelabeled, "/") {
// Drop target with '/' // Drop target with '/'
return dst, nil return dst, nil
} }
metricsPathRelabeled := "" metricsPathRelabeled := promrelabel.GetLabelValueByName(labels, "__metrics_path__")
if metricsPathLabel := promrelabel.GetLabelByName(labels, "__metrics_path__"); metricsPathLabel != nil {
metricsPathRelabeled = metricsPathLabel.Value
}
if metricsPathRelabeled == "" { if metricsPathRelabeled == "" {
metricsPathRelabeled = "/metrics" metricsPathRelabeled = "/metrics"
} }

6
lib/promscrape/scrapework.go
View file

@ -62,11 +62,7 @@ type ScrapeWork struct {
// Job returns job for the ScrapeWork // Job returns job for the ScrapeWork
func (sw *ScrapeWork) Job() string { func (sw *ScrapeWork) Job() string {
label := promrelabel.GetLabelByName(sw.Labels, "job") return promrelabel.GetLabelValueByName(sw.Labels, "job")
if label == nil {
return ""
}
return label.Value
} }
type scrapeWork struct { type scrapeWork struct {