mirror of
https://github.com/VictoriaMetrics/VictoriaMetrics.git
synced 2024-11-21 14:44:00 +00:00
386 lines
10 KiB
Go
386 lines
10 KiB
Go
package promscrape
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import (
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"flag"
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"fmt"
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"io"
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"net/http"
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"sort"
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"strconv"
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"strings"
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"sync"
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"time"
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"unsafe"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/fasttime"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/prompbmarshal"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/promrelabel"
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)
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var maxDroppedTargets = flag.Int("promscrape.maxDroppedTargets", 1000, "The maximum number of droppedTargets to show at /api/v1/targets page. "+
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"Increase this value if your setup drops more scrape targets during relabeling and you need investigating labels for all the dropped targets. "+
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"Note that the increased number of tracked dropped targets may result in increased memory usage")
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var tsmGlobal = newTargetStatusMap()
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// WriteTargetResponse serves requests to /target_response?id=<id>
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//
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// It fetches response for the given target id and returns it.
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func WriteTargetResponse(w http.ResponseWriter, r *http.Request) error {
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targetID := r.FormValue("id")
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sw := tsmGlobal.getScrapeWorkByTargetID(targetID)
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if sw == nil {
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return fmt.Errorf("cannot find target for id=%s", targetID)
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}
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data, err := sw.getTargetResponse()
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if err != nil {
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return fmt.Errorf("cannot fetch response from id=%s: %w", targetID, err)
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}
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w.Header().Set("Content-Type", "text/plain; charset=utf-8")
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_, err = w.Write(data)
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return err
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}
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// WriteHumanReadableTargetsStatus writes human-readable status for all the scrape targets to w according to r.
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func WriteHumanReadableTargetsStatus(w http.ResponseWriter, r *http.Request) {
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showOriginalLabels, _ := strconv.ParseBool(r.FormValue("show_original_labels"))
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showOnlyUnhealthy, _ := strconv.ParseBool(r.FormValue("show_only_unhealthy"))
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if accept := r.Header.Get("Accept"); strings.Contains(accept, "text/html") {
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w.Header().Set("Content-Type", "text/html; charset=utf-8")
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tsmGlobal.WriteTargetsHTML(w, showOnlyUnhealthy)
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} else {
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w.Header().Set("Content-Type", "text/plain; charset=utf-8")
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tsmGlobal.WriteTargetsPlain(w, showOriginalLabels)
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}
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}
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// WriteAPIV1Targets writes /api/v1/targets to w according to https://prometheus.io/docs/prometheus/latest/querying/api/#targets
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func WriteAPIV1Targets(w io.Writer, state string) {
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if state == "" {
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state = "any"
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}
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fmt.Fprintf(w, `{"status":"success","data":{"activeTargets":`)
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if state == "active" || state == "any" {
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tsmGlobal.WriteActiveTargetsJSON(w)
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} else {
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fmt.Fprintf(w, `[]`)
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}
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fmt.Fprintf(w, `,"droppedTargets":`)
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if state == "dropped" || state == "any" {
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droppedTargetsMap.WriteDroppedTargetsJSON(w)
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} else {
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fmt.Fprintf(w, `[]`)
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}
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fmt.Fprintf(w, `}}`)
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}
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type targetStatusMap struct {
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mu sync.Mutex
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m map[*scrapeWork]*targetStatus
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jobNames []string
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}
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func newTargetStatusMap() *targetStatusMap {
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return &targetStatusMap{
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m: make(map[*scrapeWork]*targetStatus),
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}
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}
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func (tsm *targetStatusMap) Reset() {
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tsm.mu.Lock()
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tsm.m = make(map[*scrapeWork]*targetStatus)
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tsm.mu.Unlock()
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}
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func (tsm *targetStatusMap) registerJobNames(jobNames []string) {
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tsm.mu.Lock()
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tsm.jobNames = append(tsm.jobNames[:0], jobNames...)
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tsm.mu.Unlock()
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}
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func (tsm *targetStatusMap) Register(sw *scrapeWork) {
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tsm.mu.Lock()
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tsm.m[sw] = &targetStatus{
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sw: sw,
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}
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tsm.mu.Unlock()
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}
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func (tsm *targetStatusMap) Unregister(sw *scrapeWork) {
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tsm.mu.Lock()
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delete(tsm.m, sw)
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tsm.mu.Unlock()
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}
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func (tsm *targetStatusMap) Update(sw *scrapeWork, group string, up bool, scrapeTime, scrapeDuration int64, samplesScraped int, err error) {
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tsm.mu.Lock()
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ts := tsm.m[sw]
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if ts == nil {
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ts = &targetStatus{
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sw: sw,
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}
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tsm.m[sw] = ts
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}
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ts.up = up
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ts.scrapeGroup = group
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ts.scrapeTime = scrapeTime
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ts.scrapeDuration = scrapeDuration
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ts.samplesScraped = samplesScraped
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ts.scrapesTotal++
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if !up {
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ts.scrapesFailed++
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}
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ts.err = err
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tsm.mu.Unlock()
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}
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func (tsm *targetStatusMap) getScrapeWorkByTargetID(targetID string) *scrapeWork {
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tsm.mu.Lock()
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defer tsm.mu.Unlock()
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for sw := range tsm.m {
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if getTargetID(sw) == targetID {
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return sw
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}
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}
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return nil
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}
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func getTargetID(sw *scrapeWork) string {
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return fmt.Sprintf("%016x", uintptr(unsafe.Pointer(sw)))
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}
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// StatusByGroup returns the number of targets with status==up
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// for the given group name
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func (tsm *targetStatusMap) StatusByGroup(group string, up bool) int {
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var count int
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tsm.mu.Lock()
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for _, st := range tsm.m {
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if st.scrapeGroup == group && st.up == up {
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count++
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}
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}
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tsm.mu.Unlock()
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return count
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}
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// WriteActiveTargetsJSON writes `activeTargets` contents to w according to https://prometheus.io/docs/prometheus/latest/querying/api/#targets
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func (tsm *targetStatusMap) WriteActiveTargetsJSON(w io.Writer) {
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tsm.mu.Lock()
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type keyStatus struct {
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key string
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st targetStatus
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}
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kss := make([]keyStatus, 0, len(tsm.m))
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for sw, st := range tsm.m {
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key := promLabelsString(sw.Config.OriginalLabels)
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kss = append(kss, keyStatus{
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key: key,
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st: *st,
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})
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}
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tsm.mu.Unlock()
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sort.Slice(kss, func(i, j int) bool {
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return kss[i].key < kss[j].key
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})
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fmt.Fprintf(w, `[`)
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for i, ks := range kss {
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st := ks.st
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fmt.Fprintf(w, `{"discoveredLabels":`)
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writeLabelsJSON(w, st.sw.Config.OriginalLabels)
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fmt.Fprintf(w, `,"labels":`)
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labelsFinalized := promrelabel.FinalizeLabels(nil, st.sw.Config.Labels)
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writeLabelsJSON(w, labelsFinalized)
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fmt.Fprintf(w, `,"scrapePool":%q`, st.sw.Config.Job())
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fmt.Fprintf(w, `,"scrapeUrl":%q`, st.sw.Config.ScrapeURL)
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errMsg := ""
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if st.err != nil {
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errMsg = st.err.Error()
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}
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fmt.Fprintf(w, `,"lastError":%q`, errMsg)
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fmt.Fprintf(w, `,"lastScrape":%q`, time.Unix(st.scrapeTime/1000, (st.scrapeTime%1000)*1e6).Format(time.RFC3339Nano))
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fmt.Fprintf(w, `,"lastScrapeDuration":%g`, (time.Millisecond * time.Duration(st.scrapeDuration)).Seconds())
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fmt.Fprintf(w, `,"lastSamplesScraped":%d`, st.samplesScraped)
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state := "up"
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if !st.up {
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state = "down"
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}
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fmt.Fprintf(w, `,"health":%q}`, state)
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if i+1 < len(kss) {
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fmt.Fprintf(w, `,`)
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}
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}
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fmt.Fprintf(w, `]`)
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}
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func writeLabelsJSON(w io.Writer, labels []prompbmarshal.Label) {
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fmt.Fprintf(w, `{`)
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for i, label := range labels {
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fmt.Fprintf(w, "%q:%q", label.Name, label.Value)
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if i+1 < len(labels) {
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fmt.Fprintf(w, `,`)
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}
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}
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fmt.Fprintf(w, `}`)
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}
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type targetStatus struct {
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sw *scrapeWork
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up bool
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scrapeGroup string
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scrapeTime int64
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scrapeDuration int64
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samplesScraped int
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scrapesTotal int
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scrapesFailed int
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err error
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}
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func (st *targetStatus) getDurationFromLastScrape() time.Duration {
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return time.Since(time.Unix(st.scrapeTime/1000, (st.scrapeTime%1000)*1e6))
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}
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type droppedTargets struct {
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mu sync.Mutex
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m map[string]droppedTarget
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lastCleanupTime uint64
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}
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type droppedTarget struct {
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originalLabels []prompbmarshal.Label
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deadline uint64
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}
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func (dt *droppedTargets) Register(originalLabels []prompbmarshal.Label) {
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key := promLabelsString(originalLabels)
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currentTime := fasttime.UnixTimestamp()
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dt.mu.Lock()
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if k, ok := dt.m[key]; ok {
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k.deadline = currentTime + 10*60
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dt.m[key] = k
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} else if len(dt.m) < *maxDroppedTargets {
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dt.m[key] = droppedTarget{
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originalLabels: originalLabels,
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deadline: currentTime + 10*60,
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}
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}
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if currentTime-dt.lastCleanupTime > 60 {
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for k, v := range dt.m {
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if currentTime > v.deadline {
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delete(dt.m, k)
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}
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}
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dt.lastCleanupTime = currentTime
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}
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dt.mu.Unlock()
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}
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// WriteDroppedTargetsJSON writes `droppedTargets` contents to w according to https://prometheus.io/docs/prometheus/latest/querying/api/#targets
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func (dt *droppedTargets) WriteDroppedTargetsJSON(w io.Writer) {
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dt.mu.Lock()
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type keyStatus struct {
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key string
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originalLabels []prompbmarshal.Label
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}
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kss := make([]keyStatus, 0, len(dt.m))
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for _, v := range dt.m {
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key := promLabelsString(v.originalLabels)
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kss = append(kss, keyStatus{
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key: key,
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originalLabels: v.originalLabels,
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})
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}
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dt.mu.Unlock()
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sort.Slice(kss, func(i, j int) bool {
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return kss[i].key < kss[j].key
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})
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fmt.Fprintf(w, `[`)
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for i, ks := range kss {
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fmt.Fprintf(w, `{"discoveredLabels":`)
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writeLabelsJSON(w, ks.originalLabels)
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fmt.Fprintf(w, `}`)
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if i+1 < len(kss) {
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fmt.Fprintf(w, `,`)
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}
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}
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fmt.Fprintf(w, `]`)
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}
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var droppedTargetsMap = &droppedTargets{
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m: make(map[string]droppedTarget),
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}
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type jobTargetsStatuses struct {
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job string
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upCount int
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targetsTotal int
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targetsStatus []targetStatus
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}
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func (tsm *targetStatusMap) getTargetsStatusByJob() ([]jobTargetsStatuses, []string) {
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byJob := make(map[string][]targetStatus)
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tsm.mu.Lock()
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for _, st := range tsm.m {
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job := st.sw.Config.jobNameOriginal
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byJob[job] = append(byJob[job], *st)
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}
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jobNames := append([]string{}, tsm.jobNames...)
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tsm.mu.Unlock()
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var jts []jobTargetsStatuses
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for job, statuses := range byJob {
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sort.Slice(statuses, func(i, j int) bool {
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return statuses[i].sw.Config.ScrapeURL < statuses[j].sw.Config.ScrapeURL
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})
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ups := 0
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var targetsStatuses []targetStatus
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for _, ts := range statuses {
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if ts.up {
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ups++
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}
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targetsStatuses = append(targetsStatuses, ts)
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}
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jts = append(jts, jobTargetsStatuses{
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job: job,
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upCount: ups,
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targetsTotal: len(statuses),
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targetsStatus: targetsStatuses,
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})
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}
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sort.Slice(jts, func(i, j int) bool {
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return jts[i].job < jts[j].job
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})
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emptyJobs := getEmptyJobs(jts, jobNames)
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return jts, emptyJobs
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}
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func getEmptyJobs(jts []jobTargetsStatuses, jobNames []string) []string {
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jobNamesMap := make(map[string]struct{}, len(jobNames))
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for _, jobName := range jobNames {
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jobNamesMap[jobName] = struct{}{}
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}
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for i := range jts {
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delete(jobNamesMap, jts[i].job)
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}
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emptyJobs := make([]string, 0, len(jobNamesMap))
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for k := range jobNamesMap {
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emptyJobs = append(emptyJobs, k)
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}
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sort.Strings(emptyJobs)
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return emptyJobs
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}
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// WriteTargetsHTML writes targets status grouped by job into writer w in html table,
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// accepts filter to show only unhealthy targets.
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func (tsm *targetStatusMap) WriteTargetsHTML(w io.Writer, showOnlyUnhealthy bool) {
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jss, emptyJobs := tsm.getTargetsStatusByJob()
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WriteTargetsResponseHTML(w, jss, emptyJobs, showOnlyUnhealthy)
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}
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// WriteTargetsPlain writes targets grouped by job into writer w in plain text,
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// accept filter to show original labels.
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func (tsm *targetStatusMap) WriteTargetsPlain(w io.Writer, showOriginalLabels bool) {
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jss, emptyJobs := tsm.getTargetsStatusByJob()
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WriteTargetsResponsePlain(w, jss, emptyJobs, showOriginalLabels)
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}
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