/
target.go
315 lines (251 loc) · 6.7 KB
/
target.go
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package prometheus
import (
"context"
"regexp"
"sort"
"strings"
"time"
"github.com/fatih/color"
v1 "github.com/prometheus/client_golang/api/prometheus/v1"
"github.com/prometheus/common/model"
"golang.org/x/sync/errgroup"
"k8s.io/apimachinery/pkg/labels"
)
const (
jobLabelName = "job"
sourcesJobName = "promi_scrape_sources"
sourceLabelName = "promi_scrape_src"
)
// Targets is a slice of prometheus targets.
type Targets []Target
// Target is prometheus Target.
type Target struct {
v1.ActiveTarget
}
// Job returns the job label value.
func (t Target) Job() string {
job, ok := t.Labels[jobLabelName]
if !ok {
job = dlftJobName
}
return string(job)
}
// Header represents a target header.
func (t Target) Header() []string {
return []string{"SERVER", "JOB", "SCRAPE_URL", "LAST_SCRAPE", "LABELS", "LAST_ERROR", "HEALTH"}
}
// Row represents a target row.
func (t Target) Row() []string {
health := t.Health
col := color.New(color.FgGreen).SprintFunc()
if health == v1.HealthBad {
col = color.New(color.FgRed).SprintFunc()
}
if health == v1.HealthUnknown {
col = color.New(color.FgYellow).SprintFunc()
}
server := string(t.Labels[sourceLabelName])
return []string{server, t.Job(), t.ScrapeURL, time.Since(t.LastScrape).String(), t.Labels.String(), t.ActiveTarget.LastError, col(string(t.Health))}
}
// Targets returns all active targets. If appendScraperAsTarget is true the scraper status
// is added to the active targets and all errors accessing scrapers are ignored.
func (c Client) Targets(ctx context.Context, appendScraperAsTarget bool) (Targets, error) {
g, ctx := errgroup.WithContext(ctx)
results := make(chan result, len(c.clients))
for server, client := range c.clients {
client := client
server := server
g.Go(func() error {
start := time.Now()
r, err := client.Targets(ctx)
if appendScraperAsTarget {
a := v1.ActiveTarget{
ScrapeURL: server,
ScrapePool: sourcesJobName,
GlobalURL: server,
Labels: model.LabelSet{
"instance": model.LabelValue(server),
},
DiscoveredLabels: map[string]string{},
LastScrape: start,
LastScrapeDuration: time.Since(start).Seconds(),
Health: v1.HealthGood,
}
if err != nil {
a.Health = v1.HealthBad
a.LastError = err.Error()
}
r.Active = append(r.Active, a)
err = nil // ingoring errors if we append scrapers as targets
}
if err != nil {
return err
}
results <- result{
server: server,
target: r,
}
return nil
})
}
if err := g.Wait(); err != nil {
return nil, err
}
close(results)
targets := Targets{}
for r := range results {
for i := range r.target.Active {
activeTarget := r.target.Active[i]
if activeTarget.ScrapePool != sourcesJobName {
activeTarget.Labels[sourceLabelName] = model.LabelValue(r.server)
}
if err := activeTarget.Labels.Validate(); err != nil {
return nil, err
}
target := Target{
ActiveTarget: activeTarget,
}
targets = append(targets, target)
}
}
return targets, nil
}
// TargetFilterFunc is a function to filter targets. If function returns true
// service is selected else omitted.
type TargetFilterFunc func(Target) bool
// Filter filters Targets with TargetFilterFunc.
func (t Targets) Filter(filters ...TargetFilterFunc) Targets {
targets := Targets{}
for i := range t {
selectTarget := true
for _, f := range filters {
selectTarget = selectTarget && f(t[i])
}
if selectTarget {
targets = append(targets, t[i])
}
}
return targets
}
// TargetByServer filters Targets by prometheus server.
func TargetByServer(r *regexp.Regexp) TargetFilterFunc {
return func(t Target) bool {
return r.MatchString(string(t.Labels[sourceLabelName]))
}
}
// TargetByJob filters Targets by job.
func TargetByJob(r *regexp.Regexp) TargetFilterFunc {
return func(t Target) bool {
return r.MatchString(t.Job())
}
}
// TargetByScrapeURL filters Targets by scrape url.
func TargetByScrapeURL(r *regexp.Regexp) TargetFilterFunc {
return func(t Target) bool {
return r.MatchString(t.ScrapeURL)
}
}
// TargetByHealth filters Targets by health.
func TargetByHealth(health v1.HealthStatus) TargetFilterFunc {
return func(t Target) bool {
return t.Health == health
}
}
// TargetBySelector filters Services by Selector.
func TargetBySelector(selector labels.Selector) TargetFilterFunc {
return func(t Target) bool {
return selector.Matches(t.labels())
}
}
// Sort sorts targets by job and scrape url.
func (t Targets) Sort() {
sort.Slice(t, func(i, j int) bool {
switch strings.Compare(t[i].Job(), t[j].Job()) {
case -1:
return true
case 1:
return false
}
switch strings.Compare(string(t[i].Labels[sourceLabelName]), string(t[j].Labels[sourceLabelName])) {
case -1:
return true
case 1:
return false
}
return t[i].ScrapeURL < t[j].ScrapeURL
})
}
// Compact removes labels and last error information.
func (t Targets) Compact() {
for i := range t {
t[i].Labels = model.LabelSet{}
t[i].LastError = ""
}
}
// Active returns the active targets.
func (t Targets) Active() []*v1.ActiveTarget {
active := []*v1.ActiveTarget{}
for i := range t {
active = append(active, &t[i].ActiveTarget)
}
return active
}
// Deduplicate deduplicates targets by scrape url. If identical targets
// have different health status, then HealthBad status has highest priority.
// Multiple sources are appended in the sourceLabelName label.
func (t Targets) Deduplicate() Targets {
m := map[string]Target{}
for i := range t {
target := t[i]
if tg, ok := m[target.ScrapeURL]; ok {
tg.addSource(target.getSource())
if target.Health == tg.Health || tg.Health == v1.HealthBad {
target.addSource(tg.getSource())
continue
}
}
m[target.ScrapeURL] = target
}
targets := make(Targets, 0, len(m))
for s := range m {
targets = append(targets, m[s])
}
return targets
}
func (t Target) labels() k8sLabels {
return k8sLabels{
LabelSet: t.Labels,
}
}
type result struct {
target v1.TargetsResult
server string
}
type k8sLabels struct {
model.LabelSet
}
// Has returs true if Labels contains key.
func (l k8sLabels) Has(key string) bool {
_, ok := l.LabelSet[model.LabelName(key)]
return ok
}
// Get gets the value for key.
func (l k8sLabels) Get(key string) string {
return string(l.LabelSet[model.LabelName(key)])
}
func (t Target) addSource(src string) {
s := string(t.Labels[sourceLabelName])
if s == "" || src == "" || strings.Contains(s, src) {
return
}
l := []string{s}
if strings.Contains(s, ",") {
l = strings.Split(s, ",")
}
l = append(l, src)
sort.Strings(l)
t.Labels[sourceLabelName] = model.LabelValue(strings.Join(l, ","))
}
func (t Target) getSource() string {
return string(t.Labels[sourceLabelName])
}