mirror of
https://github.com/VictoriaMetrics/VictoriaMetrics.git
synced 2024-12-01 14:47:38 +00:00
6ab1cede62
* lib/{httpserver,netutil}: allow to define min and max TLS version of the http server * lib/httpserver: added descriptions about tls supported versions * lib/netutil: check minimal tls version, added supported tls versions to error * wip Co-authored-by: Aliaksandr Valialkin <valyala@victoriametrics.com>
691 lines
23 KiB
Go
691 lines
23 KiB
Go
package httpserver
|
|
|
|
import (
|
|
"bufio"
|
|
"context"
|
|
"crypto/tls"
|
|
"errors"
|
|
"flag"
|
|
"fmt"
|
|
"io"
|
|
"log"
|
|
"net"
|
|
"net/http"
|
|
"net/http/pprof"
|
|
"os"
|
|
"runtime"
|
|
"strconv"
|
|
"strings"
|
|
"sync"
|
|
"sync/atomic"
|
|
"time"
|
|
|
|
"github.com/VictoriaMetrics/VictoriaMetrics/lib/appmetrics"
|
|
"github.com/VictoriaMetrics/VictoriaMetrics/lib/fasttime"
|
|
"github.com/VictoriaMetrics/VictoriaMetrics/lib/flagutil"
|
|
"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
|
|
"github.com/VictoriaMetrics/VictoriaMetrics/lib/netutil"
|
|
"github.com/VictoriaMetrics/metrics"
|
|
"github.com/klauspost/compress/gzip"
|
|
"github.com/valyala/fastrand"
|
|
)
|
|
|
|
var (
|
|
tlsEnable = flag.Bool("tls", false, "Whether to enable TLS for incoming HTTP requests at -httpListenAddr (aka https). -tlsCertFile and -tlsKeyFile must be set if -tls is set")
|
|
tlsCertFile = flag.String("tlsCertFile", "", "Path to file with TLS certificate if -tls is set. Prefer ECDSA certs instead of RSA certs as RSA certs are slower. The provided certificate file is automatically re-read every second, so it can be dynamically updated")
|
|
tlsKeyFile = flag.String("tlsKeyFile", "", "Path to file with TLS key if -tls is set. The provided key file is automatically re-read every second, so it can be dynamically updated")
|
|
tlsCipherSuites = flagutil.NewArray("tlsCipherSuites", "Optional list of TLS cipher suites for incoming requests over HTTPS if -tls is set. See the list of supported cipher suites at https://pkg.go.dev/crypto/tls#pkg-constants")
|
|
tlsMinVersion = flag.String("tlsMinVersion", "", "Optional minimum TLS version to use for incoming requests over HTTPS if -tls is set. "+
|
|
"Supported values: TLS10, TLS11, TLS12, TLS13")
|
|
|
|
pathPrefix = flag.String("http.pathPrefix", "", "An optional prefix to add to all the paths handled by http server. For example, if '-http.pathPrefix=/foo/bar' is set, "+
|
|
"then all the http requests will be handled on '/foo/bar/*' paths. This may be useful for proxied requests. "+
|
|
"See https://www.robustperception.io/using-external-urls-and-proxies-with-prometheus")
|
|
httpAuthUsername = flag.String("httpAuth.username", "", "Username for HTTP Basic Auth. The authentication is disabled if empty. See also -httpAuth.password")
|
|
httpAuthPassword = flag.String("httpAuth.password", "", "Password for HTTP Basic Auth. The authentication is disabled if -httpAuth.username is empty")
|
|
metricsAuthKey = flag.String("metricsAuthKey", "", "Auth key for /metrics endpoint. It must be passed via authKey query arg. It overrides httpAuth.* settings")
|
|
flagsAuthKey = flag.String("flagsAuthKey", "", "Auth key for /flags endpoint. It must be passed via authKey query arg. It overrides httpAuth.* settings")
|
|
pprofAuthKey = flag.String("pprofAuthKey", "", "Auth key for /debug/pprof/* endpoints. It must be passed via authKey query arg. It overrides httpAuth.* settings")
|
|
|
|
disableResponseCompression = flag.Bool("http.disableResponseCompression", false, "Disable compression of HTTP responses to save CPU resources. By default compression is enabled to save network bandwidth")
|
|
maxGracefulShutdownDuration = flag.Duration("http.maxGracefulShutdownDuration", 7*time.Second, `The maximum duration for a graceful shutdown of the HTTP server. A highly loaded server may require increased value for a graceful shutdown`)
|
|
shutdownDelay = flag.Duration("http.shutdownDelay", 0, `Optional delay before http server shutdown. During this delay, the server returns non-OK responses from /health page, so load balancers can route new requests to other servers`)
|
|
idleConnTimeout = flag.Duration("http.idleConnTimeout", time.Minute, "Timeout for incoming idle http connections")
|
|
connTimeout = flag.Duration("http.connTimeout", 2*time.Minute, `Incoming http connections are closed after the configured timeout. This may help to spread the incoming load among a cluster of services behind a load balancer. Please note that the real timeout may be bigger by up to 10% as a protection against the thundering herd problem`)
|
|
)
|
|
|
|
var (
|
|
servers = make(map[string]*server)
|
|
serversLock sync.Mutex
|
|
)
|
|
|
|
type server struct {
|
|
shutdownDelayDeadline int64
|
|
s *http.Server
|
|
}
|
|
|
|
// RequestHandler must serve the given request r and write response to w.
|
|
//
|
|
// RequestHandler must return true if the request has been served (successfully or not).
|
|
//
|
|
// RequestHandler must return false if it cannot serve the given request.
|
|
// In such cases the caller must serve the request.
|
|
type RequestHandler func(w http.ResponseWriter, r *http.Request) bool
|
|
|
|
// Serve starts an http server on the given addr with the given optional rh.
|
|
//
|
|
// By default all the responses are transparently compressed, since Google
|
|
// charges a lot for the egress traffic. The compression may be disabled
|
|
// by calling DisableResponseCompression before writing the first byte to w.
|
|
//
|
|
// The compression is also disabled if -http.disableResponseCompression flag is set.
|
|
func Serve(addr string, rh RequestHandler) {
|
|
if rh == nil {
|
|
rh = func(w http.ResponseWriter, r *http.Request) bool {
|
|
return false
|
|
}
|
|
}
|
|
scheme := "http"
|
|
if *tlsEnable {
|
|
scheme = "https"
|
|
}
|
|
hostAddr := addr
|
|
if strings.HasPrefix(hostAddr, ":") {
|
|
hostAddr = "127.0.0.1" + hostAddr
|
|
}
|
|
logger.Infof("starting http server at %s://%s/", scheme, hostAddr)
|
|
logger.Infof("pprof handlers are exposed at %s://%s/debug/pprof/", scheme, hostAddr)
|
|
var tlsConfig *tls.Config
|
|
if *tlsEnable {
|
|
tc, err := netutil.GetServerTLSConfig(*tlsCertFile, *tlsKeyFile, *tlsMinVersion, *tlsCipherSuites)
|
|
if err != nil {
|
|
logger.Fatalf("cannot load TLS cert from -tlsCertFile=%q, -tlsKeyFile=%q, -tlsMinVersion=%q: %s", *tlsCertFile, *tlsKeyFile, *tlsMinVersion, err)
|
|
}
|
|
tlsConfig = tc
|
|
}
|
|
ln, err := netutil.NewTCPListener(scheme, addr, tlsConfig)
|
|
if err != nil {
|
|
logger.Fatalf("cannot start http server at %s: %s", addr, err)
|
|
}
|
|
serveWithListener(addr, ln, rh)
|
|
}
|
|
|
|
func serveWithListener(addr string, ln net.Listener, rh RequestHandler) {
|
|
var s server
|
|
s.s = &http.Server{
|
|
Handler: gzipHandler(&s, rh),
|
|
|
|
// Disable http/2, since it doesn't give any advantages for VictoriaMetrics services.
|
|
TLSNextProto: make(map[string]func(*http.Server, *tls.Conn, http.Handler)),
|
|
|
|
ReadHeaderTimeout: 5 * time.Second,
|
|
IdleTimeout: *idleConnTimeout,
|
|
|
|
// Do not set ReadTimeout and WriteTimeout here,
|
|
// since these timeouts must be controlled by request handlers.
|
|
|
|
ErrorLog: logger.StdErrorLogger(),
|
|
|
|
ConnContext: func(ctx context.Context, c net.Conn) context.Context {
|
|
timeoutSec := connTimeout.Seconds()
|
|
// Add a jitter for connection timeout in order to prevent Thundering herd problem
|
|
// when all the connections are established at the same time.
|
|
// See https://en.wikipedia.org/wiki/Thundering_herd_problem
|
|
jitterSec := fastrand.Uint32n(uint32(timeoutSec / 10))
|
|
deadline := fasttime.UnixTimestamp() + uint64(timeoutSec) + uint64(jitterSec)
|
|
return context.WithValue(ctx, connDeadlineTimeKey, &deadline)
|
|
},
|
|
}
|
|
serversLock.Lock()
|
|
servers[addr] = &s
|
|
serversLock.Unlock()
|
|
if err := s.s.Serve(ln); err != nil {
|
|
if err == http.ErrServerClosed {
|
|
// The server gracefully closed.
|
|
return
|
|
}
|
|
logger.Panicf("FATAL: cannot serve http at %s: %s", addr, err)
|
|
}
|
|
}
|
|
|
|
func whetherToCloseConn(r *http.Request) bool {
|
|
ctx := r.Context()
|
|
v := ctx.Value(connDeadlineTimeKey)
|
|
deadline, ok := v.(*uint64)
|
|
return ok && fasttime.UnixTimestamp() > *deadline
|
|
}
|
|
|
|
var connDeadlineTimeKey = interface{}("connDeadlineSecs")
|
|
|
|
// Stop stops the http server on the given addr, which has been started
|
|
// via Serve func.
|
|
func Stop(addr string) error {
|
|
serversLock.Lock()
|
|
s := servers[addr]
|
|
delete(servers, addr)
|
|
serversLock.Unlock()
|
|
if s == nil {
|
|
err := fmt.Errorf("BUG: there is no http server at %q", addr)
|
|
logger.Panicf("%s", err)
|
|
// The return is needed for golangci-lint: SA5011(related information): this check suggests that the pointer can be nil
|
|
return err
|
|
}
|
|
|
|
deadline := time.Now().Add(*shutdownDelay).UnixNano()
|
|
atomic.StoreInt64(&s.shutdownDelayDeadline, deadline)
|
|
if *shutdownDelay > 0 {
|
|
// Sleep for a while until load balancer in front of the server
|
|
// notifies that "/health" endpoint returns non-OK responses.
|
|
// See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/463 .
|
|
logger.Infof("Waiting for %.3fs before shutdown of http server %q, so load balancers could re-route requests to other servers", shutdownDelay.Seconds(), addr)
|
|
time.Sleep(*shutdownDelay)
|
|
logger.Infof("Starting shutdown for http server %q", addr)
|
|
}
|
|
|
|
ctx, cancel := context.WithTimeout(context.Background(), *maxGracefulShutdownDuration)
|
|
defer cancel()
|
|
if err := s.s.Shutdown(ctx); err != nil {
|
|
return fmt.Errorf("cannot gracefully shutdown http server at %q in %.3fs; "+
|
|
"probably, `-http.maxGracefulShutdownDuration` command-line flag value must be increased; error: %s", addr, maxGracefulShutdownDuration.Seconds(), err)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func gzipHandler(s *server, rh RequestHandler) http.HandlerFunc {
|
|
return func(w http.ResponseWriter, r *http.Request) {
|
|
w = maybeGzipResponseWriter(w, r)
|
|
handlerWrapper(s, w, r, rh)
|
|
if zrw, ok := w.(*gzipResponseWriter); ok {
|
|
if err := zrw.Close(); err != nil && !isTrivialNetworkError(err) {
|
|
logger.Warnf("gzipResponseWriter.Close: %s", err)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
var metricsHandlerDuration = metrics.NewHistogram(`vm_http_request_duration_seconds{path="/metrics"}`)
|
|
var connTimeoutClosedConns = metrics.NewCounter(`vm_http_conn_timeout_closed_conns_total`)
|
|
|
|
var hostname = func() string {
|
|
h, err := os.Hostname()
|
|
if err != nil {
|
|
// Cannot use logger.Errorf, since it isn't initialized yet.
|
|
// So use log.Printf instead.
|
|
log.Printf("ERROR: cannot determine hostname: %s", err)
|
|
return "unknown"
|
|
}
|
|
return h
|
|
}()
|
|
|
|
func handlerWrapper(s *server, w http.ResponseWriter, r *http.Request, rh RequestHandler) {
|
|
// All the VictoriaMetrics code assumes that panic stops the process.
|
|
// Unfortunately, the standard net/http.Server recovers from panics in request handlers,
|
|
// so VictoriaMetrics state can become inconsistent after the recovered panic.
|
|
// The following recover() code works around this by explicitly stopping the process after logging the panic.
|
|
// See https://github.com/golang/go/issues/16542#issuecomment-246549902 for details.
|
|
defer func() {
|
|
if err := recover(); err != nil {
|
|
buf := make([]byte, 1<<20)
|
|
n := runtime.Stack(buf, false)
|
|
fmt.Fprintf(os.Stderr, "panic: %v\n\n%s", err, buf[:n])
|
|
os.Exit(1)
|
|
}
|
|
}()
|
|
|
|
w.Header().Add("X-Server-Hostname", hostname)
|
|
requestsTotal.Inc()
|
|
if whetherToCloseConn(r) {
|
|
connTimeoutClosedConns.Inc()
|
|
w.Header().Set("Connection", "close")
|
|
}
|
|
path := r.URL.Path
|
|
prefix := GetPathPrefix()
|
|
if prefix != "" {
|
|
// Trim -http.pathPrefix from path
|
|
prefixNoTrailingSlash := strings.TrimSuffix(prefix, "/")
|
|
if path == prefixNoTrailingSlash {
|
|
// Redirect to url with / at the end.
|
|
// This is needed for proper handling of relative urls in web browsers.
|
|
// Intentionally ignore query args, since it is expected that the requested url
|
|
// is composed by a human, so it doesn't contain query args.
|
|
RedirectPermanent(w, prefix)
|
|
return
|
|
}
|
|
if !strings.HasPrefix(path, prefix) {
|
|
Errorf(w, r, "missing -http.pathPrefix=%q in the requested path %q", *pathPrefix, path)
|
|
unsupportedRequestErrors.Inc()
|
|
return
|
|
}
|
|
path = path[len(prefix)-1:]
|
|
r.URL.Path = path
|
|
}
|
|
switch r.URL.Path {
|
|
case "/health":
|
|
w.Header().Set("Content-Type", "text/plain; charset=utf-8")
|
|
deadline := atomic.LoadInt64(&s.shutdownDelayDeadline)
|
|
if deadline <= 0 {
|
|
w.Write([]byte("OK"))
|
|
return
|
|
}
|
|
// Return non-OK response during grace period before shutting down the server.
|
|
// Load balancers must notify these responses and re-route new requests to other servers.
|
|
// See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/463 .
|
|
d := time.Until(time.Unix(0, deadline))
|
|
if d < 0 {
|
|
d = 0
|
|
}
|
|
errMsg := fmt.Sprintf("The server is in delayed shutdown mode, which will end in %.3fs", d.Seconds())
|
|
http.Error(w, errMsg, http.StatusServiceUnavailable)
|
|
return
|
|
case "/ping":
|
|
// This is needed for compatibility with InfluxDB agents.
|
|
// See https://docs.influxdata.com/influxdb/v1.7/tools/api/#ping-http-endpoint
|
|
status := http.StatusNoContent
|
|
if verbose := r.FormValue("verbose"); verbose == "true" {
|
|
status = http.StatusOK
|
|
}
|
|
w.WriteHeader(status)
|
|
return
|
|
case "/favicon.ico":
|
|
faviconRequests.Inc()
|
|
w.WriteHeader(http.StatusNoContent)
|
|
return
|
|
case "/metrics":
|
|
metricsRequests.Inc()
|
|
if len(*metricsAuthKey) > 0 && r.FormValue("authKey") != *metricsAuthKey {
|
|
http.Error(w, "The provided authKey doesn't match -metricsAuthKey", http.StatusUnauthorized)
|
|
return
|
|
}
|
|
startTime := time.Now()
|
|
w.Header().Set("Content-Type", "text/plain; charset=utf-8")
|
|
appmetrics.WritePrometheusMetrics(w)
|
|
metricsHandlerDuration.UpdateDuration(startTime)
|
|
return
|
|
case "/flags":
|
|
if len(*flagsAuthKey) > 0 && r.FormValue("authKey") != *flagsAuthKey {
|
|
http.Error(w, "The provided authKey doesn't match -flagsAuthKey", http.StatusUnauthorized)
|
|
return
|
|
}
|
|
w.Header().Set("Content-Type", "text/plain; charset=utf-8")
|
|
flagutil.WriteFlags(w)
|
|
return
|
|
case "/-/healthy":
|
|
// This is needed for Prometheus compatibility
|
|
// See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/1833
|
|
fmt.Fprintf(w, "VictoriaMetrics is Healthy.\n")
|
|
return
|
|
case "/-/ready":
|
|
// This is needed for Prometheus compatibility
|
|
// See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/1833
|
|
fmt.Fprintf(w, "VictoriaMetrics is Ready.\n")
|
|
return
|
|
default:
|
|
if strings.HasPrefix(r.URL.Path, "/debug/pprof/") {
|
|
pprofRequests.Inc()
|
|
if len(*pprofAuthKey) > 0 && r.FormValue("authKey") != *pprofAuthKey {
|
|
http.Error(w, "The provided authKey doesn't match -pprofAuthKey", http.StatusUnauthorized)
|
|
return
|
|
}
|
|
DisableResponseCompression(w)
|
|
pprofHandler(r.URL.Path[len("/debug/pprof/"):], w, r)
|
|
return
|
|
}
|
|
|
|
if !checkBasicAuth(w, r) {
|
|
return
|
|
}
|
|
if rh(w, r) {
|
|
return
|
|
}
|
|
|
|
Errorf(w, r, "unsupported path requested: %q", r.URL.Path)
|
|
unsupportedRequestErrors.Inc()
|
|
return
|
|
}
|
|
}
|
|
|
|
func checkBasicAuth(w http.ResponseWriter, r *http.Request) bool {
|
|
if len(*httpAuthUsername) == 0 {
|
|
// HTTP Basic Auth is disabled.
|
|
return true
|
|
}
|
|
username, password, ok := r.BasicAuth()
|
|
if ok && username == *httpAuthUsername && password == *httpAuthPassword {
|
|
return true
|
|
}
|
|
w.Header().Set("WWW-Authenticate", `Basic realm="VictoriaMetrics"`)
|
|
http.Error(w, "", http.StatusUnauthorized)
|
|
return false
|
|
}
|
|
|
|
func maybeGzipResponseWriter(w http.ResponseWriter, r *http.Request) http.ResponseWriter {
|
|
if *disableResponseCompression {
|
|
return w
|
|
}
|
|
if r.Header.Get("Connection") == "Upgrade" {
|
|
return w
|
|
}
|
|
ae := r.Header.Get("Accept-Encoding")
|
|
if ae == "" {
|
|
return w
|
|
}
|
|
ae = strings.ToLower(ae)
|
|
n := strings.Index(ae, "gzip")
|
|
if n < 0 {
|
|
// Do not apply gzip encoding to the response.
|
|
return w
|
|
}
|
|
// Apply gzip encoding to the response.
|
|
zw := getGzipWriter(w)
|
|
bw := getBufioWriter(zw)
|
|
zrw := &gzipResponseWriter{
|
|
rw: w,
|
|
zw: zw,
|
|
bw: bw,
|
|
}
|
|
return zrw
|
|
}
|
|
|
|
// DisableResponseCompression disables response compression on w.
|
|
//
|
|
// The function must be called before the first w.Write* call.
|
|
func DisableResponseCompression(w http.ResponseWriter) {
|
|
zrw, ok := w.(*gzipResponseWriter)
|
|
if !ok {
|
|
return
|
|
}
|
|
if zrw.firstWriteDone {
|
|
logger.Panicf("BUG: DisableResponseCompression must be called before sending the response")
|
|
}
|
|
zrw.disableCompression = true
|
|
}
|
|
|
|
// EnableCORS enables https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS
|
|
// on the response.
|
|
func EnableCORS(w http.ResponseWriter, _ *http.Request) {
|
|
w.Header().Set("Access-Control-Allow-Origin", "*")
|
|
}
|
|
|
|
func getGzipWriter(w io.Writer) *gzip.Writer {
|
|
v := gzipWriterPool.Get()
|
|
if v == nil {
|
|
zw, err := gzip.NewWriterLevel(w, 1)
|
|
if err != nil {
|
|
logger.Panicf("BUG: cannot create gzip writer: %s", err)
|
|
}
|
|
return zw
|
|
}
|
|
zw := v.(*gzip.Writer)
|
|
zw.Reset(w)
|
|
return zw
|
|
}
|
|
|
|
func putGzipWriter(zw *gzip.Writer) {
|
|
gzipWriterPool.Put(zw)
|
|
}
|
|
|
|
var gzipWriterPool sync.Pool
|
|
|
|
type gzipResponseWriter struct {
|
|
rw http.ResponseWriter
|
|
zw *gzip.Writer
|
|
bw *bufio.Writer
|
|
statusCode int
|
|
|
|
firstWriteDone bool
|
|
disableCompression bool
|
|
}
|
|
|
|
// Implements http.ResponseWriter.Header method.
|
|
func (zrw *gzipResponseWriter) Header() http.Header {
|
|
return zrw.rw.Header()
|
|
}
|
|
|
|
// Implements http.ResponseWriter.Write method.
|
|
func (zrw *gzipResponseWriter) Write(p []byte) (int, error) {
|
|
if !zrw.firstWriteDone {
|
|
h := zrw.Header()
|
|
if zrw.statusCode == http.StatusNoContent {
|
|
zrw.disableCompression = true
|
|
}
|
|
if h.Get("Content-Encoding") != "" {
|
|
zrw.disableCompression = true
|
|
}
|
|
if !zrw.disableCompression {
|
|
h.Set("Content-Encoding", "gzip")
|
|
h.Del("Content-Length")
|
|
if h.Get("Content-Type") == "" {
|
|
// Disable auto-detection of content-type, since it
|
|
// is incorrectly detected after the compression.
|
|
h.Set("Content-Type", "text/html; charset=utf-8")
|
|
}
|
|
}
|
|
zrw.writeHeader()
|
|
zrw.firstWriteDone = true
|
|
}
|
|
if zrw.disableCompression {
|
|
return zrw.rw.Write(p)
|
|
}
|
|
return zrw.bw.Write(p)
|
|
}
|
|
|
|
// Implements http.ResponseWriter.WriteHeader method.
|
|
func (zrw *gzipResponseWriter) WriteHeader(statusCode int) {
|
|
zrw.statusCode = statusCode
|
|
}
|
|
|
|
func (zrw *gzipResponseWriter) writeHeader() {
|
|
if zrw.statusCode == 0 {
|
|
zrw.statusCode = http.StatusOK
|
|
}
|
|
zrw.rw.WriteHeader(zrw.statusCode)
|
|
}
|
|
|
|
// Implements http.Flusher
|
|
func (zrw *gzipResponseWriter) Flush() {
|
|
if !zrw.firstWriteDone {
|
|
_, _ = zrw.Write(nil)
|
|
}
|
|
if !zrw.disableCompression {
|
|
if err := zrw.bw.Flush(); err != nil && !isTrivialNetworkError(err) {
|
|
logger.Warnf("gzipResponseWriter.Flush (buffer): %s", err)
|
|
}
|
|
if err := zrw.zw.Flush(); err != nil && !isTrivialNetworkError(err) {
|
|
logger.Warnf("gzipResponseWriter.Flush (gzip): %s", err)
|
|
}
|
|
}
|
|
if fw, ok := zrw.rw.(http.Flusher); ok {
|
|
fw.Flush()
|
|
}
|
|
}
|
|
|
|
func (zrw *gzipResponseWriter) Close() error {
|
|
if !zrw.firstWriteDone {
|
|
_, _ = zrw.Write(nil)
|
|
}
|
|
zrw.Flush()
|
|
var err error
|
|
if !zrw.disableCompression {
|
|
err = zrw.zw.Close()
|
|
}
|
|
putGzipWriter(zrw.zw)
|
|
zrw.zw = nil
|
|
putBufioWriter(zrw.bw)
|
|
zrw.bw = nil
|
|
return err
|
|
}
|
|
|
|
func getBufioWriter(w io.Writer) *bufio.Writer {
|
|
v := bufioWriterPool.Get()
|
|
if v == nil {
|
|
return bufio.NewWriterSize(w, 16*1024)
|
|
}
|
|
bw := v.(*bufio.Writer)
|
|
bw.Reset(w)
|
|
return bw
|
|
}
|
|
|
|
func putBufioWriter(bw *bufio.Writer) {
|
|
bufioWriterPool.Put(bw)
|
|
}
|
|
|
|
var bufioWriterPool sync.Pool
|
|
|
|
func pprofHandler(profileName string, w http.ResponseWriter, r *http.Request) {
|
|
// This switch has been stolen from init func at https://golang.org/src/net/http/pprof/pprof.go
|
|
switch profileName {
|
|
case "cmdline":
|
|
pprofCmdlineRequests.Inc()
|
|
pprof.Cmdline(w, r)
|
|
case "profile":
|
|
pprofProfileRequests.Inc()
|
|
pprof.Profile(w, r)
|
|
case "symbol":
|
|
pprofSymbolRequests.Inc()
|
|
pprof.Symbol(w, r)
|
|
case "trace":
|
|
pprofTraceRequests.Inc()
|
|
pprof.Trace(w, r)
|
|
case "mutex":
|
|
pprofMutexRequests.Inc()
|
|
seconds, _ := strconv.Atoi(r.FormValue("seconds"))
|
|
if seconds <= 0 {
|
|
seconds = 10
|
|
}
|
|
prev := runtime.SetMutexProfileFraction(10)
|
|
time.Sleep(time.Duration(seconds) * time.Second)
|
|
pprof.Index(w, r)
|
|
runtime.SetMutexProfileFraction(prev)
|
|
default:
|
|
pprofDefaultRequests.Inc()
|
|
pprof.Index(w, r)
|
|
}
|
|
}
|
|
|
|
var (
|
|
metricsRequests = metrics.NewCounter(`vm_http_requests_total{path="/metrics"}`)
|
|
pprofRequests = metrics.NewCounter(`vm_http_requests_total{path="/debug/pprof/"}`)
|
|
pprofCmdlineRequests = metrics.NewCounter(`vm_http_requests_total{path="/debug/pprof/cmdline"}`)
|
|
pprofProfileRequests = metrics.NewCounter(`vm_http_requests_total{path="/debug/pprof/profile"}`)
|
|
pprofSymbolRequests = metrics.NewCounter(`vm_http_requests_total{path="/debug/pprof/symbol"}`)
|
|
pprofTraceRequests = metrics.NewCounter(`vm_http_requests_total{path="/debug/pprof/trace"}`)
|
|
pprofMutexRequests = metrics.NewCounter(`vm_http_requests_total{path="/debug/pprof/mutex"}`)
|
|
pprofDefaultRequests = metrics.NewCounter(`vm_http_requests_total{path="/debug/pprof/default"}`)
|
|
faviconRequests = metrics.NewCounter(`vm_http_requests_total{path="/favicon.ico"}`)
|
|
|
|
unsupportedRequestErrors = metrics.NewCounter(`vm_http_request_errors_total{path="*", reason="unsupported"}`)
|
|
|
|
requestsTotal = metrics.NewCounter(`vm_http_requests_all_total`)
|
|
)
|
|
|
|
// GetQuotedRemoteAddr returns quoted remote address.
|
|
func GetQuotedRemoteAddr(r *http.Request) string {
|
|
remoteAddr := strconv.Quote(r.RemoteAddr) // quote remoteAddr and X-Forwarded-For, since they may contain untrusted input
|
|
if addr := r.Header.Get("X-Forwarded-For"); addr != "" {
|
|
remoteAddr += ", X-Forwarded-For: " + strconv.Quote(addr)
|
|
}
|
|
return remoteAddr
|
|
}
|
|
|
|
// Errorf writes formatted error message to w and to logger.
|
|
func Errorf(w http.ResponseWriter, r *http.Request, format string, args ...interface{}) {
|
|
errStr := fmt.Sprintf(format, args...)
|
|
remoteAddr := GetQuotedRemoteAddr(r)
|
|
requestURI := GetRequestURI(r)
|
|
errStr = fmt.Sprintf("remoteAddr: %s; requestURI: %s; %s", remoteAddr, requestURI, errStr)
|
|
logger.WarnfSkipframes(1, "%s", errStr)
|
|
|
|
// Extract statusCode from args
|
|
statusCode := http.StatusBadRequest
|
|
var esc *ErrorWithStatusCode
|
|
for _, arg := range args {
|
|
if err, ok := arg.(error); ok && errors.As(err, &esc) {
|
|
statusCode = esc.StatusCode
|
|
break
|
|
}
|
|
}
|
|
http.Error(w, errStr, statusCode)
|
|
}
|
|
|
|
// ErrorWithStatusCode is error with HTTP status code.
|
|
//
|
|
// The given StatusCode is sent to client when the error is passed to Errorf.
|
|
type ErrorWithStatusCode struct {
|
|
Err error
|
|
StatusCode int
|
|
}
|
|
|
|
// Unwrap returns e.Err.
|
|
//
|
|
// This is used by standard errors package. See https://golang.org/pkg/errors
|
|
func (e *ErrorWithStatusCode) Unwrap() error {
|
|
return e.Err
|
|
}
|
|
|
|
// Error implements error interface.
|
|
func (e *ErrorWithStatusCode) Error() string {
|
|
return e.Err.Error()
|
|
}
|
|
|
|
func isTrivialNetworkError(err error) bool {
|
|
s := err.Error()
|
|
if strings.Contains(s, "broken pipe") || strings.Contains(s, "reset by peer") {
|
|
return true
|
|
}
|
|
return false
|
|
}
|
|
|
|
// IsTLS indicates is tls enabled or not
|
|
func IsTLS() bool {
|
|
return *tlsEnable
|
|
}
|
|
|
|
// GetPathPrefix - returns http server path prefix.
|
|
func GetPathPrefix() string {
|
|
prefix := *pathPrefix
|
|
if prefix == "" {
|
|
return ""
|
|
}
|
|
if !strings.HasPrefix(prefix, "/") {
|
|
prefix = "/" + prefix
|
|
}
|
|
if !strings.HasSuffix(prefix, "/") {
|
|
prefix += "/"
|
|
}
|
|
return prefix
|
|
}
|
|
|
|
// WriteAPIHelp writes pathList to w in HTML format.
|
|
func WriteAPIHelp(w io.Writer, pathList [][2]string) {
|
|
for _, p := range pathList {
|
|
p, doc := p[0], p[1]
|
|
fmt.Fprintf(w, "<a href=%q>%s</a> - %s<br/>", p, p, doc)
|
|
}
|
|
}
|
|
|
|
// GetRequestURI returns requestURI for r.
|
|
func GetRequestURI(r *http.Request) string {
|
|
requestURI := r.RequestURI
|
|
if r.Method != "POST" {
|
|
return requestURI
|
|
}
|
|
_ = r.ParseForm()
|
|
queryArgs := r.PostForm.Encode()
|
|
if len(queryArgs) == 0 {
|
|
return requestURI
|
|
}
|
|
delimiter := "?"
|
|
if strings.Contains(requestURI, delimiter) {
|
|
delimiter = "&"
|
|
}
|
|
return requestURI + delimiter + queryArgs
|
|
}
|
|
|
|
// RedirectPermanent redirects to the given url using 301 status code.
|
|
func RedirectPermanent(w http.ResponseWriter, url string) {
|
|
// Do not use http.Redirect, since it breaks relative redirects
|
|
// if the http.Request.URL contains unexpected url.
|
|
// See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/2918
|
|
w.Header().Set("Location", url)
|
|
w.WriteHeader(http.StatusMovedPermanently)
|
|
}
|