VictoriaMetrics/app/victoria-metrics/main.go

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package main
import (
"flag"
"fmt"
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"net/http"
"os"
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"time"
"github.com/VictoriaMetrics/VictoriaMetrics/app/vminsert"
"github.com/VictoriaMetrics/VictoriaMetrics/app/vmselect"
"github.com/VictoriaMetrics/VictoriaMetrics/app/vmselect/promql"
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"github.com/VictoriaMetrics/VictoriaMetrics/app/vmstorage"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/buildinfo"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/envflag"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/flagutil"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/fs"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/httpserver"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/procutil"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/promscrape"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/pushmetrics"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/storage"
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)
var (
httpListenAddr = flag.String("httpListenAddr", ":8428", "TCP address to listen for http connections")
minScrapeInterval = flag.Duration("dedup.minScrapeInterval", 0, "Leave only the last sample in every time series per each discrete interval "+
"equal to -dedup.minScrapeInterval > 0. See https://docs.victoriametrics.com/#deduplication and https://docs.victoriametrics.com/#downsampling")
dryRun = flag.Bool("dryRun", false, "Whether to check only -promscrape.config and then exit. "+
"Unknown config entries aren't allowed in -promscrape.config by default. This can be changed with -promscrape.config.strictParse=false command-line flag")
downsamplingPeriods = flagutil.NewArray("downsampling.period", "Comma-separated downsampling periods in the format 'offset:period'. For example, '30d:10m' instructs "+
"to leave a single sample per 10 minutes for samples older than 30 days. See https://docs.victoriametrics.com/#downsampling for details")
)
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// custom api help links [["/api","doc"]] without http.pathPrefix.
var customAPIPathList = [][]string{
{"/graph/explore", "explore metrics grafana page"},
{"/graph/d/prometheus-advanced/advanced-data-exploration", "PMM grafana dashboard"},
}
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func main() {
// Write flags and help message to stdout, since it is easier to grep or pipe.
flag.CommandLine.SetOutput(os.Stdout)
flag.Usage = usage
envflag.Parse()
pushmetrics.Init()
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buildinfo.Init()
logger.Init()
if promscrape.IsDryRun() {
*dryRun = true
}
if *dryRun {
if err := promscrape.CheckConfig(); err != nil {
logger.Fatalf("error when checking -promscrape.config: %s", err)
}
logger.Infof("-promscrape.config is ok; exitting with 0 status code")
return
}
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logger.Infof("starting VictoriaMetrics at %q...", *httpListenAddr)
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startTime := time.Now()
err := storage.SetDownsamplingPeriods(*downsamplingPeriods, *minScrapeInterval)
if err != nil {
logger.Fatalf("cannot parse -downsampling.period: %s", err)
}
vmstorage.Init(promql.ResetRollupResultCacheIfNeeded)
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vmselect.Init()
vminsert.Init()
startSelfScraper()
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go httpserver.Serve(*httpListenAddr, requestHandler)
logger.Infof("started VictoriaMetrics in %.3f seconds", time.Since(startTime).Seconds())
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sig := procutil.WaitForSigterm()
logger.Infof("received signal %s", sig)
stopSelfScraper()
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logger.Infof("gracefully shutting down webservice at %q", *httpListenAddr)
startTime = time.Now()
if err := httpserver.Stop(*httpListenAddr); err != nil {
logger.Fatalf("cannot stop the webservice: %s", err)
}
vminsert.Stop()
logger.Infof("successfully shut down the webservice in %.3f seconds", time.Since(startTime).Seconds())
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vmstorage.Stop()
vmselect.Stop()
fs.MustStopDirRemover()
logger.Infof("the VictoriaMetrics has been stopped in %.3f seconds", time.Since(startTime).Seconds())
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}
func requestHandler(w http.ResponseWriter, r *http.Request) bool {
if r.URL.Path == "/" {
if r.Method != "GET" {
return false
}
w.Header().Add("Content-Type", "text/html; charset=utf-8")
fmt.Fprintf(w, "<h2>Single-node VictoriaMetrics</h2></br>")
fmt.Fprintf(w, "See docs at <a href='https://docs.victoriametrics.com/'>https://docs.victoriametrics.com/</a></br>")
fmt.Fprintf(w, "Useful endpoints:</br>")
httpserver.WriteAPIHelp(w, [][2]string{
{"vmui", "Web UI"},
{"targets", "status for discovered active targets"},
{"service-discovery", "labels before and after relabeling for discovered targets"},
{"api/v1/targets", "advanced information about discovered targets in JSON format"},
{"config", "-promscrape.config contents"},
{"metrics", "available service metrics"},
{"flags", "command-line flags"},
{"api/v1/status/tsdb", "tsdb status page"},
{"api/v1/status/top_queries", "top queries"},
{"api/v1/status/active_queries", "active queries"},
})
for _, p := range customAPIPathList {
p, doc := p[0], p[1]
fmt.Fprintf(w, "<a href=%q>%s</a> - %s<br/>", p, p, doc)
}
return true
}
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if vminsert.RequestHandler(w, r) {
return true
}
if vmselect.RequestHandler(w, r) {
return true
}
if vmstorage.RequestHandler(w, r) {
return true
}
return false
}
func usage() {
const s = `
victoria-metrics is a time series database and monitoring solution.
See the docs at https://docs.victoriametrics.com/
`
flagutil.Usage(s)
}