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https://github.com/VictoriaMetrics/VictoriaMetrics.git
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e79cd24807
* lib/promrelabel: make target url from labels on target relabel page * wip --------- Co-authored-by: Aliaksandr Valialkin <valyala@victoriametrics.com>
115 lines
3.0 KiB
Go
115 lines
3.0 KiB
Go
package promrelabel
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import (
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"net/url"
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"strings"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/bytesutil"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/promutils"
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)
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// GetScrapeURL makes scrape url and __address_ labels for the given labels and extraParams.
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func GetScrapeURL(labels *promutils.Labels, extraParams map[string][]string) (string, string) {
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// See https://www.robustperception.io/life-of-a-label
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scheme := labels.Get("__scheme__")
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if len(scheme) == 0 {
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scheme = "http"
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}
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metricsPath := labels.Get("__metrics_path__")
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if len(metricsPath) == 0 {
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metricsPath = "/metrics"
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}
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address := labels.Get("__address__")
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if len(address) == 0 {
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return "", ""
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}
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// Usability extension to Prometheus behavior: extract optional scheme and metricsPath from __address__.
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// Prometheus silently drops targets with __address__ containing scheme or metricsPath
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// according to https://www.robustperception.io/life-of-a-label/ .
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if strings.HasPrefix(address, "http://") {
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scheme = "http"
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address = address[len("http://"):]
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} else if strings.HasPrefix(address, "https://") {
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scheme = "https"
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address = address[len("https://"):]
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}
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if n := strings.IndexByte(address, '/'); n >= 0 {
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metricsPath = address[n:]
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address = address[:n]
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}
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address = addMissingPort(address, scheme == "https")
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if !strings.HasPrefix(metricsPath, "/") {
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metricsPath = "/" + metricsPath
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}
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params := getParamsFromLabels(labels, extraParams)
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optionalQuestion := ""
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if len(params) > 0 {
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optionalQuestion = "?"
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if strings.Contains(metricsPath, "?") {
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optionalQuestion = "&"
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}
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}
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paramsStr := url.Values(params).Encode()
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scrapeURL := buildScrapeURL(scheme, address, metricsPath, optionalQuestion, paramsStr)
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return scrapeURL, address
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}
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func getParamsFromLabels(labels *promutils.Labels, extraParams map[string][]string) map[string][]string {
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// See https://www.robustperception.io/life-of-a-label
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var m map[string][]string
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for _, label := range labels.GetLabels() {
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if !strings.HasPrefix(label.Name, "__param_") {
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continue
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}
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name := label.Name[len("__param_"):]
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values := []string{label.Value}
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if p := extraParams[name]; len(p) > 1 {
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values = append(values, p[1:]...)
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}
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if m == nil {
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m = make(map[string][]string)
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}
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m[name] = values
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}
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return m
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}
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func buildScrapeURL(scheme, address, metricsPath, optionalQuestion, paramsStr string) string {
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bb := bbPool.Get()
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b := bb.B[:0]
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b = append(b, scheme...)
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b = append(b, "://"...)
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b = append(b, address...)
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b = append(b, metricsPath...)
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b = append(b, optionalQuestion...)
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b = append(b, paramsStr...)
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s := bytesutil.InternBytes(b)
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bb.B = b
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bbPool.Put(bb)
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return s
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}
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func addMissingPort(addr string, isTLS bool) string {
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if strings.Contains(addr, ":") {
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return addr
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}
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if isTLS {
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return concatTwoStrings(addr, ":443")
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}
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return concatTwoStrings(addr, ":80")
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}
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func concatTwoStrings(x, y string) string {
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bb := bbPool.Get()
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b := bb.B[:0]
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b = append(b, x...)
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b = append(b, y...)
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s := bytesutil.InternBytes(b)
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bb.B = b
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bbPool.Put(bb)
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return s
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}
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var bbPool bytesutil.ByteBufferPool
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