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|
package main
import (
"crypto/tls"
"log"
"net"
"net/http"
"strconv"
"strings"
"sync"
"time"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
"github.com/rs/cors"
"gitlab.com/gitlab-org/gitlab-pages/internal/artifact"
"gitlab.com/gitlab-org/gitlab-pages/internal/httperrors"
"gitlab.com/gitlab-org/gitlab-pages/metrics"
)
const xForwardedProto = "X-Forwarded-Proto"
const xForwardedProtoHTTPS = "https"
var (
corsHandler = cors.New(cors.Options{AllowedMethods: []string{"GET"}})
)
type theApp struct {
appConfig
domains domains
lock sync.RWMutex
Artifact *artifact.Artifact
}
func (a *theApp) isReady() bool {
return a.domains != nil
}
func (a *theApp) domain(host string) *domain {
host = strings.ToLower(host)
a.lock.RLock()
defer a.lock.RUnlock()
domain, _ := a.domains[host]
return domain
}
func (a *theApp) ServeTLS(ch *tls.ClientHelloInfo) (*tls.Certificate, error) {
if ch.ServerName == "" {
return nil, nil
}
if domain := a.domain(ch.ServerName); domain != nil {
tls, _ := domain.ensureCertificate()
return tls, nil
}
return nil, nil
}
func (a *theApp) healthCheck(w http.ResponseWriter, r *http.Request, https bool) {
if a.isReady() {
w.Write([]byte("success"))
} else {
http.Error(w, "not yet ready", http.StatusServiceUnavailable)
}
}
func (a *theApp) serveContent(ww http.ResponseWriter, r *http.Request, https bool) {
w := newLoggingResponseWriter(ww)
defer w.Log(r)
metrics.SessionsActive.Inc()
defer metrics.SessionsActive.Dec()
// short circuit content serving to check for a status page
if r.RequestURI == a.appConfig.StatusPath {
a.healthCheck(&w, r, https)
return
}
// Add auto redirect
if !https && a.RedirectHTTP {
u := *r.URL
u.Scheme = "https"
u.Host = r.Host
u.User = nil
http.Redirect(&w, r, u.String(), 307)
return
}
host, _, err := net.SplitHostPort(r.Host)
if err != nil {
host = r.Host
}
// In the event a host is prefixed with the artifact prefix an artifact
// value is created, and an attempt to proxy the request is made
if a.Artifact.TryMakeRequest(host, &w, r) {
return
}
if !a.isReady() {
httperrors.Serve503(&w)
return
}
domain := a.domain(host)
if domain == nil {
httperrors.Serve404(&w)
return
}
// Serve static file, applying CORS headers if necessary
if a.DisableCrossOriginRequests {
domain.ServeHTTP(&w, r)
} else {
corsHandler.ServeHTTP(&w, r, domain.ServeHTTP)
}
metrics.ProcessedRequests.WithLabelValues(strconv.Itoa(w.status), r.Method).Inc()
}
func (a *theApp) ServeHTTP(ww http.ResponseWriter, r *http.Request) {
https := r.TLS != nil
a.serveContent(ww, r, https)
}
func (a *theApp) ServeProxy(ww http.ResponseWriter, r *http.Request) {
forwardedProto := r.Header.Get(xForwardedProto)
https := forwardedProto == xForwardedProtoHTTPS
a.serveContent(ww, r, https)
}
func (a *theApp) UpdateDomains(domains domains) {
a.lock.Lock()
defer a.lock.Unlock()
a.domains = domains
}
func (a *theApp) Run() {
var wg sync.WaitGroup
// Listen for HTTP
for _, fd := range a.ListenHTTP {
wg.Add(1)
go func(fd uintptr) {
defer wg.Done()
err := listenAndServe(fd, a.ServeHTTP, a.HTTP2, nil)
if err != nil {
log.Fatal(err)
}
}(fd)
}
// Listen for HTTPS
for _, fd := range a.ListenHTTPS {
wg.Add(1)
go func(fd uintptr) {
defer wg.Done()
err := listenAndServeTLS(fd, a.RootCertificate, a.RootKey, a.ServeHTTP, a.ServeTLS, a.HTTP2)
if err != nil {
log.Fatal(err)
}
}(fd)
}
// Listen for HTTP proxy requests
for _, fd := range a.ListenProxy {
wg.Add(1)
go func(fd uintptr) {
defer wg.Done()
err := listenAndServe(fd, a.ServeProxy, a.HTTP2, nil)
if err != nil {
log.Fatal(err)
}
}(fd)
}
// Serve metrics for Prometheus
if a.ListenMetrics != 0 {
wg.Add(1)
go func(fd uintptr) {
defer wg.Done()
handler := promhttp.HandlerFor(prometheus.DefaultGatherer, promhttp.HandlerOpts{}).ServeHTTP
err := listenAndServe(fd, handler, false, nil)
if err != nil {
log.Fatal(err)
}
}(a.ListenMetrics)
}
go watchDomains(a.Domain, a.UpdateDomains, time.Second)
wg.Wait()
}
func runApp(config appConfig) {
a := theApp{appConfig: config}
if config.ArtifactsServer != "" {
a.Artifact = artifact.New(config.ArtifactsServer, config.ArtifactsServerTimeout, config.Domain)
}
a.Run()
}
|
