mirror of
https://github.com/VictoriaMetrics/VictoriaMetrics.git
synced 2024-12-26 20:30:10 +01:00
383 lines
13 KiB
Go
383 lines
13 KiB
Go
package main
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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"
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"net/http"
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"net/textproto"
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"net/url"
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"os"
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"strings"
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"sync"
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"time"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/buildinfo"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/bytesutil"
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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/netutil"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/procutil"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/pushmetrics"
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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. See also -httpListenAddr.useProxyProtocol")
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useProxyProtocol = flag.Bool("httpListenAddr.useProxyProtocol", false, "Whether to use proxy protocol for connections accepted at -httpListenAddr . "+
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"See https://www.haproxy.org/download/1.8/doc/proxy-protocol.txt . "+
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"With enabled proxy protocol http server cannot serve regular /metrics endpoint. Use -pushmetrics.url for metrics pushing")
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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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"See also -maxConcurrentRequests")
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responseTimeout = flag.Duration("responseTimeout", 5*time.Minute, "The timeout for receiving a response from backend")
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maxConcurrentRequests = flag.Int("maxConcurrentRequests", 1000, "The maximum number of concurrent requests vmauth can process. Other requests are rejected with "+
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"'429 Too Many Requests' http status code. See also -maxConcurrentPerUserRequests and -maxIdleConnsPerBackend command-line options")
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maxConcurrentPerUserRequests = flag.Int("maxConcurrentPerUserRequests", 300, "The maximum number of concurrent requests vmauth can process per each configured user. "+
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"Other requests are rejected with '429 Too Many Requests' http status code. See also -maxConcurrentRequests command-line option and max_concurrent_requests option "+
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"in per-user config")
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reloadAuthKey = flag.String("reloadAuthKey", "", "Auth key for /-/reload http endpoint. It must be passed as authKey=...")
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logInvalidAuthTokens = flag.Bool("logInvalidAuthTokens", false, "Whether to log requests with invalid auth tokens. "+
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`Such requests are always counted at vmauth_http_request_errors_total{reason="invalid_auth_token"} metric, which is exposed at /metrics page`)
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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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pushmetrics.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, *useProxyProtocol, 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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if !httpserver.CheckAuthFlag(w, r, *reloadAuthKey, "reloadAuthKey") {
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return true
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}
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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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// Process requests for unauthorized users
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ui := authConfig.Load().UnauthorizedUser
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if ui != nil {
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processUserRequest(w, r, ui)
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return true
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}
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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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if strings.HasPrefix(authToken, "Token ") {
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// Handle InfluxDB's proprietary token authentication scheme as a bearer token authentication
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// See https://docs.influxdata.com/influxdb/v2.0/api/
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authToken = strings.Replace(authToken, "Token", "Bearer", 1)
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}
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ac := *authUsers.Load()
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ui := ac[authToken]
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if ui == nil {
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invalidAuthTokenRequests.Inc()
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if *logInvalidAuthTokens {
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err := fmt.Errorf("cannot find the provided auth token %q in config", authToken)
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err = &httpserver.ErrorWithStatusCode{
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Err: err,
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StatusCode: http.StatusUnauthorized,
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}
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httpserver.Errorf(w, r, "%s", err)
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} else {
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http.Error(w, "Unauthorized", http.StatusUnauthorized)
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}
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return true
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}
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processUserRequest(w, r, ui)
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return true
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}
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func processUserRequest(w http.ResponseWriter, r *http.Request, ui *UserInfo) {
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ui.requests.Inc()
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// Limit the concurrency of requests to backends
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concurrencyLimitOnce.Do(concurrencyLimitInit)
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select {
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case concurrencyLimitCh <- struct{}{}:
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if err := ui.beginConcurrencyLimit(); err != nil {
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handleConcurrencyLimitError(w, r, err)
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<-concurrencyLimitCh
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return
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}
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default:
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concurrentRequestsLimitReached.Inc()
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err := fmt.Errorf("cannot serve more than -maxConcurrentRequests=%d concurrent requests", cap(concurrencyLimitCh))
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handleConcurrencyLimitError(w, r, err)
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return
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}
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processRequest(w, r, ui)
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ui.endConcurrencyLimit()
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<-concurrencyLimitCh
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}
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func processRequest(w http.ResponseWriter, r *http.Request, ui *UserInfo) {
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u := normalizeURL(r.URL)
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up, headers := ui.getURLPrefixAndHeaders(u)
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isDefault := false
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if up == nil {
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missingRouteRequests.Inc()
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if ui.DefaultURL == nil {
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httpserver.Errorf(w, r, "missing route for %q", u.String())
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return
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}
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up, headers = ui.DefaultURL, ui.Headers
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isDefault = true
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}
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r.Body = &readTrackingBody{
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r: r.Body,
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}
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maxAttempts := up.getBackendsCount()
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for i := 0; i < maxAttempts; i++ {
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bu := up.getLeastLoadedBackendURL()
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targetURL := bu.url
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// Don't change path and add request_path query param for default route.
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if isDefault {
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query := targetURL.Query()
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query.Set("request_path", u.Path)
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targetURL.RawQuery = query.Encode()
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} else { // Update path for regular routes.
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targetURL = mergeURLs(targetURL, u)
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}
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ok := tryProcessingRequest(w, r, targetURL, headers)
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bu.put()
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if ok {
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return
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}
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bu.setBroken()
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}
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err := &httpserver.ErrorWithStatusCode{
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Err: fmt.Errorf("all the backends for the user %q are unavailable", ui.name()),
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StatusCode: http.StatusServiceUnavailable,
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}
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httpserver.Errorf(w, r, "%s", err)
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}
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func tryProcessingRequest(w http.ResponseWriter, r *http.Request, targetURL *url.URL, headers []Header) bool {
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// This code has been copied from net/http/httputil/reverseproxy.go
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req := sanitizeRequestHeaders(r)
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req.URL = targetURL
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for _, h := range headers {
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req.Header.Set(h.Name, h.Value)
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}
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transportOnce.Do(transportInit)
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res, err := transport.RoundTrip(req)
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if err != nil {
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rtb := req.Body.(*readTrackingBody)
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if rtb.readStarted {
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// Request body has been already read, so it is impossible to retry the request.
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// Return the error to the client then.
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err = &httpserver.ErrorWithStatusCode{
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Err: fmt.Errorf("cannot proxy the request to %q: %w", targetURL, err),
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StatusCode: http.StatusServiceUnavailable,
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}
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httpserver.Errorf(w, r, "%s", err)
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return true
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}
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// Retry the request if its body wasn't read yet. This usually means that the backend isn't reachable.
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remoteAddr := httpserver.GetQuotedRemoteAddr(r)
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// NOTE: do not use httpserver.GetRequestURI
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// it explicitly reads request body and fails retries.
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logger.Warnf("remoteAddr: %s; requestURI: %s; error when proxying the request to %q: %s", remoteAddr, req.URL, targetURL, err)
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return false
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}
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removeHopHeaders(res.Header)
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copyHeader(w.Header(), res.Header)
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w.WriteHeader(res.StatusCode)
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copyBuf := copyBufPool.Get()
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copyBuf.B = bytesutil.ResizeNoCopyNoOverallocate(copyBuf.B, 16*1024)
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_, err = io.CopyBuffer(w, res.Body, copyBuf.B)
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copyBufPool.Put(copyBuf)
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if err != nil && !netutil.IsTrivialNetworkError(err) {
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remoteAddr := httpserver.GetQuotedRemoteAddr(r)
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requestURI := httpserver.GetRequestURI(r)
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logger.Warnf("remoteAddr: %s; requestURI: %s; error when proxying response body from %s: %s", remoteAddr, requestURI, targetURL, err)
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return true
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}
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return true
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}
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var copyBufPool bytesutil.ByteBufferPool
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func copyHeader(dst, src http.Header) {
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for k, vv := range src {
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for _, v := range vv {
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dst.Add(k, v)
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}
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}
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}
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func sanitizeRequestHeaders(r *http.Request) *http.Request {
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// This code has been copied from net/http/httputil/reverseproxy.go
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req := r.Clone(r.Context())
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removeHopHeaders(req.Header)
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if clientIP, _, err := net.SplitHostPort(req.RemoteAddr); err == nil {
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// If we aren't the first proxy retain prior
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// X-Forwarded-For information as a comma+space
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// separated list and fold multiple headers into one.
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prior := req.Header["X-Forwarded-For"]
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if len(prior) > 0 {
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clientIP = strings.Join(prior, ", ") + ", " + clientIP
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}
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req.Header.Set("X-Forwarded-For", clientIP)
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}
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return req
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}
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func removeHopHeaders(h http.Header) {
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// remove hop-by-hop headers listed in the "Connection" header of h.
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// See RFC 7230, section 6.1
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for _, f := range h["Connection"] {
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for _, sf := range strings.Split(f, ",") {
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if sf = textproto.TrimString(sf); sf != "" {
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h.Del(sf)
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}
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}
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}
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// Remove hop-by-hop headers to the backend. Especially
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// important is "Connection" because we want a persistent
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// connection, regardless of what the client sent to us.
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for _, key := range hopHeaders {
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h.Del(key)
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}
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}
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// Hop-by-hop headers. These are removed when sent to the backend.
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// As of RFC 7230, hop-by-hop headers are required to appear in the
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// Connection header field. These are the headers defined by the
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// obsoleted RFC 2616 (section 13.5.1) and are used for backward
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// compatibility.
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var hopHeaders = []string{
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"Connection",
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"Proxy-Connection", // non-standard but still sent by libcurl and rejected by e.g. google
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"Keep-Alive",
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"Proxy-Authenticate",
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"Proxy-Authorization",
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"Te", // canonicalized version of "TE"
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"Trailer", // not Trailers per URL above; https://www.rfc-editor.org/errata_search.php?eid=4522
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"Transfer-Encoding",
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"Upgrade",
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}
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var (
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configReloadRequests = metrics.NewCounter(`vmauth_http_requests_total{path="/-/reload"}`)
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invalidAuthTokenRequests = metrics.NewCounter(`vmauth_http_request_errors_total{reason="invalid_auth_token"}`)
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missingRouteRequests = metrics.NewCounter(`vmauth_http_request_errors_total{reason="missing_route"}`)
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)
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var (
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transport *http.Transport
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transportOnce sync.Once
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)
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func transportInit() {
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tr := http.DefaultTransport.(*http.Transport).Clone()
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tr.ResponseHeaderTimeout = *responseTimeout
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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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if tr.MaxIdleConns != 0 && tr.MaxIdleConns < tr.MaxIdleConnsPerHost {
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tr.MaxIdleConns = tr.MaxIdleConnsPerHost
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}
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transport = tr
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}
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var (
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concurrencyLimitCh chan struct{}
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concurrencyLimitOnce sync.Once
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)
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func concurrencyLimitInit() {
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concurrencyLimitCh = make(chan struct{}, *maxConcurrentRequests)
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_ = metrics.NewGauge("vmauth_concurrent_requests_capacity", func() float64 {
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return float64(*maxConcurrentRequests)
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})
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_ = metrics.NewGauge("vmauth_concurrent_requests_current", func() float64 {
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return float64(len(concurrencyLimitCh))
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})
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}
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var concurrentRequestsLimitReached = metrics.NewCounter("vmauth_concurrent_requests_limit_reached_total")
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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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func handleConcurrencyLimitError(w http.ResponseWriter, r *http.Request, err error) {
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w.Header().Add("Retry-After", "10")
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err = &httpserver.ErrorWithStatusCode{
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Err: err,
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StatusCode: http.StatusTooManyRequests,
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}
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httpserver.Errorf(w, r, "%s", err)
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}
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type readTrackingBody struct {
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r io.ReadCloser
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readStarted bool
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}
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// Read implements io.Reader interface
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// tracks body reading requests
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func (rtb *readTrackingBody) Read(p []byte) (int, error) {
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if len(p) > 0 {
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rtb.readStarted = true
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}
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return rtb.r.Read(p)
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}
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// Close implements io.Closer interface.
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func (rtb *readTrackingBody) Close() error {
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// Close rtb.r only if at least a single Read call was performed.
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// http.Roundtrip performs body.Close call even without any Read calls
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// so this hack allows us to reuse request body
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if rtb.readStarted {
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return rtb.r.Close()
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}
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return nil
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}
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