VictoriaMetrics/lib/promscrape/scraper.go

361 lines
10 KiB
Go

package promscrape
import (
"bytes"
"flag"
"os"
"os/signal"
"sync"
"syscall"
"time"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/prompbmarshal"
"github.com/VictoriaMetrics/metrics"
)
var (
configCheckInterval = flag.Duration("promscrape.configCheckInterval", 0, "Interval for checking for changes in '-promscrape.config' file. "+
"By default the checking is disabled. Send SIGHUP signal in order to force config check for changes")
fileSDCheckInterval = flag.Duration("promscrape.fileSDCheckInterval", 30*time.Second, "Interval for checking for changes in 'file_sd_config'. "+
"See https://prometheus.io/docs/prometheus/latest/configuration/configuration/#file_sd_config for details")
kubernetesSDCheckInterval = flag.Duration("promscrape.kubernetesSDCheckInterval", 30*time.Second, "Interval for checking for changes in Kubernetes API server. "+
"This works only if `kubernetes_sd_configs` is configured in '-promscrape.config' file. "+
"See https://prometheus.io/docs/prometheus/latest/configuration/configuration/#kubernetes_sd_config for details")
gceSDCheckInterval = flag.Duration("promscrape.gceSDCheckInterval", time.Minute, "Interval for checking for changes in gce. "+
"This works only if `gce_sd_configs` is configured in '-promscrape.config' file. "+
"See https://prometheus.io/docs/prometheus/latest/configuration/configuration/#gce_sd_config for details")
promscrapeConfigFile = flag.String("promscrape.config", "", "Optional path to Prometheus config file with 'scrape_configs' section containing targets to scrape. "+
"See https://prometheus.io/docs/prometheus/latest/configuration/configuration/#scrape_config for details")
)
// Init initializes Prometheus scraper with config from the `-promscrape.config`.
//
// Scraped data is passed to pushData.
func Init(pushData func(wr *prompbmarshal.WriteRequest)) {
globalStopCh = make(chan struct{})
scraperWG.Add(1)
go func() {
defer scraperWG.Done()
runScraper(*promscrapeConfigFile, pushData, globalStopCh)
}()
}
// Stop stops Prometheus scraper.
func Stop() {
close(globalStopCh)
scraperWG.Wait()
}
var (
globalStopCh chan struct{}
scraperWG sync.WaitGroup
)
func runScraper(configFile string, pushData func(wr *prompbmarshal.WriteRequest), globalStopCh <-chan struct{}) {
if configFile == "" {
// Nothing to scrape.
return
}
sighupCh := make(chan os.Signal, 1)
signal.Notify(sighupCh, syscall.SIGHUP)
logger.Infof("reading Prometheus configs from %q", configFile)
cfg, data, err := loadConfig(configFile)
if err != nil {
logger.Fatalf("cannot read %q: %s", configFile, err)
}
var tickerCh <-chan time.Time
if *configCheckInterval > 0 {
ticker := time.NewTicker(*configCheckInterval)
tickerCh = ticker.C
defer ticker.Stop()
}
mustStop := false
for !mustStop {
stopCh := make(chan struct{})
var wg sync.WaitGroup
wg.Add(1)
go func() {
defer wg.Done()
runStaticScrapers(cfg, pushData, stopCh)
}()
wg.Add(1)
go func() {
defer wg.Done()
runFileSDScrapers(cfg, pushData, stopCh)
}()
wg.Add(1)
go func() {
defer wg.Done()
runKubernetesSDScrapers(cfg, pushData, stopCh)
}()
wg.Add(1)
go func() {
defer wg.Done()
runGCESDScrapers(cfg, pushData, stopCh)
}()
waitForChans:
select {
case <-sighupCh:
logger.Infof("SIGHUP received; reloading Prometheus configs from %q", configFile)
cfgNew, dataNew, err := loadConfig(configFile)
if err != nil {
logger.Errorf("cannot read %q on SIGHUP: %s; continuing with the previous config", configFile, err)
goto waitForChans
}
if bytes.Equal(data, dataNew) {
logger.Infof("nothing changed in %q", configFile)
goto waitForChans
}
cfg = cfgNew
data = dataNew
case <-tickerCh:
cfgNew, dataNew, err := loadConfig(configFile)
if err != nil {
logger.Errorf("cannot read %q: %s; continuing with the previous config", configFile, err)
goto waitForChans
}
if bytes.Equal(data, dataNew) {
// Nothing changed since the previous loadConfig
goto waitForChans
}
cfg = cfgNew
data = dataNew
case <-globalStopCh:
mustStop = true
}
if !mustStop {
logger.Infof("found changes in %q; applying these changes", configFile)
}
logger.Infof("stopping Prometheus scrapers")
startTime := time.Now()
close(stopCh)
wg.Wait()
logger.Infof("stopped Prometheus scrapers in %.3f seconds", time.Since(startTime).Seconds())
configReloads.Inc()
}
}
var configReloads = metrics.NewCounter(`vm_promscrape_config_reloads_total`)
func runStaticScrapers(cfg *Config, pushData func(wr *prompbmarshal.WriteRequest), stopCh <-chan struct{}) {
sws := cfg.getStaticScrapeWork()
if len(sws) == 0 {
return
}
logger.Infof("starting %d scrapers for `static_config` targets", len(sws))
staticTargets.Set(uint64(len(sws)))
runScrapeWorkers(sws, pushData, stopCh)
staticTargets.Set(0)
logger.Infof("stopped all the %d scrapers for `static_config` targets", len(sws))
}
var staticTargets = metrics.NewCounter(`vm_promscrape_targets{type="static"}`)
func runKubernetesSDScrapers(cfg *Config, pushData func(wr *prompbmarshal.WriteRequest), stopCh <-chan struct{}) {
if cfg.kubernetesSDConfigsCount() == 0 {
return
}
sws := cfg.getKubernetesSDScrapeWork()
ticker := time.NewTicker(*kubernetesSDCheckInterval)
defer ticker.Stop()
mustStop := false
for !mustStop {
localStopCh := make(chan struct{})
var wg sync.WaitGroup
wg.Add(1)
go func(sws []ScrapeWork) {
defer wg.Done()
logger.Infof("starting %d scrapers for `kubernetes_sd_config` targets", len(sws))
kubernetesSDTargets.Set(uint64(len(sws)))
runScrapeWorkers(sws, pushData, localStopCh)
kubernetesSDTargets.Set(0)
logger.Infof("stopped all the %d scrapers for `kubernetes_sd_config` targets", len(sws))
}(sws)
waitForChans:
select {
case <-ticker.C:
swsNew := cfg.getKubernetesSDScrapeWork()
if equalStaticConfigForScrapeWorks(swsNew, sws) {
// Nothing changed, continue waiting for updated scrape work
goto waitForChans
}
logger.Infof("restarting scrapers for changed `kubernetes_sd_config` targets")
sws = swsNew
case <-stopCh:
mustStop = true
}
close(localStopCh)
wg.Wait()
kubernetesSDReloads.Inc()
}
}
var (
kubernetesSDTargets = metrics.NewCounter(`vm_promscrape_targets{type="kubernetes_sd"}`)
kubernetesSDReloads = metrics.NewCounter(`vm_promscrape_reloads_total{type="kubernetes_sd"}`)
)
func runGCESDScrapers(cfg *Config, pushData func(wr *prompbmarshal.WriteRequest), stopCh <-chan struct{}) {
if cfg.gceSDConfigsCount() == 0 {
return
}
sws := cfg.getGCESDScrapeWork()
ticker := time.NewTicker(*gceSDCheckInterval)
defer ticker.Stop()
mustStop := false
for !mustStop {
localStopCh := make(chan struct{})
var wg sync.WaitGroup
wg.Add(1)
go func(sws []ScrapeWork) {
defer wg.Done()
logger.Infof("starting %d scrapers for `gce_sd_config` targets", len(sws))
gceSDTargets.Set(uint64(len(sws)))
runScrapeWorkers(sws, pushData, localStopCh)
gceSDTargets.Set(0)
logger.Infof("stopped all the %d scrapers for `gce_sd_config` targets", len(sws))
}(sws)
waitForChans:
select {
case <-ticker.C:
swsNew := cfg.getGCESDScrapeWork()
if equalStaticConfigForScrapeWorks(swsNew, sws) {
// Nothing changed, continue waiting for updated scrape work
goto waitForChans
}
logger.Infof("restarting scrapers for changed `gce_sd_config` targets")
sws = swsNew
case <-stopCh:
mustStop = true
}
close(localStopCh)
wg.Wait()
gceSDReloads.Inc()
}
}
var (
gceSDTargets = metrics.NewCounter(`vm_promscrape_targets{type="gce_sd"}`)
gceSDReloads = metrics.NewCounter(`vm_promscrape_reloads_total{type="gce_sd"}`)
)
func runFileSDScrapers(cfg *Config, pushData func(wr *prompbmarshal.WriteRequest), stopCh <-chan struct{}) {
if cfg.fileSDConfigsCount() == 0 {
return
}
sws := cfg.getFileSDScrapeWork(nil)
ticker := time.NewTicker(*fileSDCheckInterval)
defer ticker.Stop()
mustStop := false
for !mustStop {
localStopCh := make(chan struct{})
var wg sync.WaitGroup
wg.Add(1)
go func(sws []ScrapeWork) {
defer wg.Done()
logger.Infof("starting %d scrapers for `file_sd_config` targets", len(sws))
fileSDTargets.Set(uint64(len(sws)))
runScrapeWorkers(sws, pushData, localStopCh)
fileSDTargets.Set(0)
logger.Infof("stopped all the %d scrapers for `file_sd_config` targets", len(sws))
}(sws)
waitForChans:
select {
case <-ticker.C:
swsNew := cfg.getFileSDScrapeWork(sws)
if equalStaticConfigForScrapeWorks(swsNew, sws) {
// Nothing changed, continue waiting for updated scrape work
goto waitForChans
}
logger.Infof("restarting scrapers for changed `file_sd_config` targets")
sws = swsNew
case <-stopCh:
mustStop = true
}
close(localStopCh)
wg.Wait()
fileSDReloads.Inc()
}
}
var (
fileSDTargets = metrics.NewCounter(`vm_promscrape_targets{type="file_sd"}`)
fileSDReloads = metrics.NewCounter(`vm_promscrape_reloads_total{type="file_sd"}`)
)
func equalStaticConfigForScrapeWorks(as, bs []ScrapeWork) bool {
if len(as) != len(bs) {
return false
}
for i := range as {
if !equalStaticConfigForScrapeWork(&as[i], &bs[i]) {
return false
}
}
return true
}
func equalStaticConfigForScrapeWork(a, b *ScrapeWork) bool {
// `static_config` can change only ScrapeURL and Labels. So compare only them.
if a.ScrapeURL != b.ScrapeURL {
return false
}
if !equalLabels(a.Labels, b.Labels) {
return false
}
return true
}
func equalLabels(as, bs []prompbmarshal.Label) bool {
if len(as) != len(bs) {
return false
}
for i := range as {
if !equalLabel(&as[i], &bs[i]) {
return false
}
}
return true
}
func equalLabel(a, b *prompbmarshal.Label) bool {
if a.Name != b.Name {
return false
}
if a.Value != b.Value {
return false
}
return true
}
// runScrapeWorkers runs sws.
//
// This function returns after closing stopCh.
func runScrapeWorkers(sws []ScrapeWork, pushData func(wr *prompbmarshal.WriteRequest), stopCh <-chan struct{}) {
tsmGlobal.RegisterAll(sws)
var wg sync.WaitGroup
for i := range sws {
cfg := &sws[i]
c := newClient(cfg)
var sw scrapeWork
sw.Config = *cfg
sw.ReadData = c.ReadData
sw.PushData = pushData
wg.Add(1)
go func() {
defer wg.Done()
sw.run(stopCh)
}()
}
wg.Wait()
tsmGlobal.UnregisterAll(sws)
}