mirror of
https://github.com/grafana/grafana.git
synced 2025-07-28 22:02:14 +08:00
89 lines
2.3 KiB
Go
89 lines
2.3 KiB
Go
package frontend
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import (
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"context"
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"net"
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"net/http"
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"time"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/client_golang/prometheus/promhttp"
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"github.com/grafana/dskit/services"
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"github.com/grafana/grafana/pkg/infra/log"
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"github.com/grafana/grafana/pkg/services/licensing"
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"github.com/grafana/grafana/pkg/setting"
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)
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type frontendService struct {
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*services.BasicService
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cfg *setting.Cfg
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httpServ *http.Server
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log log.Logger
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errChan chan error
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promGatherer prometheus.Gatherer
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index *IndexProvider
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}
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func ProvideFrontendService(cfg *setting.Cfg, promGatherer prometheus.Gatherer, license licensing.Licensing) (*frontendService, error) {
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index, err := NewIndexProvider(cfg, license)
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if err != nil {
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return nil, err
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}
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s := &frontendService{
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cfg: cfg,
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log: log.New("frontend-server"),
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promGatherer: promGatherer,
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index: index,
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}
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s.BasicService = services.NewBasicService(s.start, s.running, s.stop)
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return s, nil
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}
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func (s *frontendService) start(ctx context.Context) error {
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s.httpServ = s.newFrontendServer(ctx)
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s.errChan = make(chan error)
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go func() {
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s.errChan <- s.httpServ.ListenAndServe()
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}()
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return nil
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}
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func (s *frontendService) running(ctx context.Context) error {
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select {
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case <-ctx.Done():
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return nil
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case err := <-s.errChan:
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return err
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}
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}
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func (s *frontendService) stop(failureReason error) error {
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s.log.Info("stopping frontend server", "reason", failureReason)
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if err := s.httpServ.Shutdown(context.Background()); err != nil {
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s.log.Error("failed to shutdown frontend server", "error", err)
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return err
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}
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return nil
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}
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func (s *frontendService) newFrontendServer(ctx context.Context) *http.Server {
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s.log.Info("starting frontend server", "addr", ":"+s.cfg.HTTPPort)
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router := http.NewServeMux()
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router.Handle("/metrics", promhttp.HandlerFor(s.promGatherer, promhttp.HandlerOpts{EnableOpenMetrics: true}))
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router.HandleFunc("/", s.index.HandleRequest)
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server := &http.Server{
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// 5s timeout for header reads to avoid Slowloris attacks (https://thetooth.io/blog/slowloris-attack/)
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ReadHeaderTimeout: 5 * time.Second,
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Addr: ":" + s.cfg.HTTPPort,
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Handler: router,
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BaseContext: func(_ net.Listener) context.Context { return ctx },
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}
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return server
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}
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