mirror of
https://github.com/VictoriaMetrics/VictoriaMetrics.git
synced 2024-12-15 16:30:55 +01:00
114 lines
3.6 KiB
Go
114 lines
3.6 KiB
Go
package main
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import (
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"flag"
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"net/http"
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"net/http/httputil"
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"net/url"
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"os"
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"time"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/buildinfo"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/envflag"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/flagutil"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/httpserver"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/procutil"
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"github.com/VictoriaMetrics/metrics"
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)
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var (
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httpListenAddr = flag.String("httpListenAddr", ":8427", "TCP address to listen for http connections")
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maxIdleConnsPerBackend = flag.Int("maxIdleConnsPerBackend", 100, "The maximum number of idle connections vmauth can open per each backend host")
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)
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func main() {
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// Write flags and help message to stdout, since it is easier to grep or pipe.
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flag.CommandLine.SetOutput(os.Stdout)
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flag.Usage = usage
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envflag.Parse()
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buildinfo.Init()
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logger.Init()
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logger.Infof("starting vmauth at %q...", *httpListenAddr)
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startTime := time.Now()
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initAuthConfig()
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go httpserver.Serve(*httpListenAddr, requestHandler)
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logger.Infof("started vmauth in %.3f seconds", time.Since(startTime).Seconds())
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sig := procutil.WaitForSigterm()
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logger.Infof("received signal %s", sig)
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startTime = time.Now()
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logger.Infof("gracefully shutting down webservice at %q", *httpListenAddr)
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if err := httpserver.Stop(*httpListenAddr); err != nil {
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logger.Fatalf("cannot stop the webservice: %s", err)
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}
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logger.Infof("successfully shut down the webservice in %.3f seconds", time.Since(startTime).Seconds())
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stopAuthConfig()
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logger.Infof("successfully stopped vmauth in %.3f seconds", time.Since(startTime).Seconds())
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}
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func requestHandler(w http.ResponseWriter, r *http.Request) bool {
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switch r.URL.Path {
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case "/-/reload":
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configReloadRequests.Inc()
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procutil.SelfSIGHUP()
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w.WriteHeader(http.StatusOK)
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return true
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}
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authToken := r.Header.Get("Authorization")
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if authToken == "" {
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w.Header().Set("WWW-Authenticate", `Basic realm="Restricted"`)
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http.Error(w, "missing `Authorization` request header", http.StatusUnauthorized)
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return true
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}
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ac := authConfig.Load().(map[string]*UserInfo)
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ui := ac[authToken]
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if ui == nil {
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httpserver.Errorf(w, r, "cannot find the provided auth token %q in config", authToken)
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return true
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}
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ui.requests.Inc()
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targetURL, err := createTargetURL(ui, r.URL)
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if err != nil {
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httpserver.Errorf(w, r, "cannot determine targetURL: %s", err)
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return true
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}
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r.Header.Set("vm-target-url", targetURL.String())
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reverseProxy.ServeHTTP(w, r)
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return true
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}
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var configReloadRequests = metrics.NewCounter(`vmagent_http_requests_total{path="/-/reload"}`)
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var reverseProxy = &httputil.ReverseProxy{
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Director: func(r *http.Request) {
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targetURL := r.Header.Get("vm-target-url")
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target, err := url.Parse(targetURL)
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if err != nil {
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logger.Panicf("BUG: unexpected error when parsing targetURL=%q: %s", targetURL, err)
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}
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r.URL = target
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},
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Transport: func() *http.Transport {
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tr := http.DefaultTransport.(*http.Transport).Clone()
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// Automatic compression must be disabled in order to fix https://github.com/VictoriaMetrics/VictoriaMetrics/issues/535
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tr.DisableCompression = true
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// Disable HTTP/2.0, since VictoriaMetrics components don't support HTTP/2.0 (because there is no sense in this).
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tr.ForceAttemptHTTP2 = false
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tr.MaxIdleConnsPerHost = *maxIdleConnsPerBackend
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return tr
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}(),
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FlushInterval: time.Second,
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ErrorLog: logger.StdErrorLogger(),
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}
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func usage() {
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const s = `
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vmauth authenticates and authorizes incoming requests and proxies them to VictoriaMetrics.
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See the docs at https://docs.victoriametrics.com/vmauth.html .
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`
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flagutil.Usage(s)
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}
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