mirror of https://github.com/grafana/grafana.git
73 lines
2.0 KiB
Go
73 lines
2.0 KiB
Go
package server
|
|
|
|
import (
|
|
"context"
|
|
"net"
|
|
"net/http"
|
|
"time"
|
|
|
|
"github.com/grafana/dskit/services"
|
|
"github.com/grafana/grafana/pkg/infra/log"
|
|
"github.com/grafana/grafana/pkg/setting"
|
|
"github.com/prometheus/client_golang/prometheus"
|
|
"github.com/prometheus/client_golang/prometheus/promhttp"
|
|
)
|
|
|
|
type instrumentationService struct {
|
|
*services.BasicService
|
|
cfg *setting.Cfg
|
|
httpServ *http.Server
|
|
log log.Logger
|
|
errChan chan error
|
|
promGatherer prometheus.Gatherer
|
|
}
|
|
|
|
func NewInstrumentationService(log log.Logger, cfg *setting.Cfg, promGatherer prometheus.Gatherer) (*instrumentationService, error) {
|
|
s := &instrumentationService{log: log, cfg: cfg, promGatherer: promGatherer}
|
|
s.BasicService = services.NewBasicService(s.start, s.running, s.stop)
|
|
return s, nil
|
|
}
|
|
|
|
func (s *instrumentationService) start(ctx context.Context) error {
|
|
s.httpServ = s.newInstrumentationServer(ctx)
|
|
s.errChan = make(chan error)
|
|
go func() {
|
|
s.errChan <- s.httpServ.ListenAndServe()
|
|
}()
|
|
return nil
|
|
}
|
|
|
|
func (s *instrumentationService) running(ctx context.Context) error {
|
|
select {
|
|
case <-ctx.Done():
|
|
return nil
|
|
case err := <-s.errChan:
|
|
return err
|
|
}
|
|
}
|
|
|
|
func (s *instrumentationService) stop(failureReason error) error {
|
|
s.log.Info("stopping instrumentation server", "reason", failureReason)
|
|
if err := s.httpServ.Shutdown(context.Background()); err != nil {
|
|
s.log.Error("failed to shutdown instrumentation server", "error", err)
|
|
return err
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (s *instrumentationService) newInstrumentationServer(ctx context.Context) *http.Server {
|
|
router := http.NewServeMux()
|
|
router.Handle("/metrics", promhttp.HandlerFor(s.promGatherer, promhttp.HandlerOpts{EnableOpenMetrics: true}))
|
|
|
|
srv := &http.Server{
|
|
// 5s timeout for header reads to avoid Slowloris attacks (https://thetooth.io/blog/slowloris-attack/)
|
|
ReadHeaderTimeout: 5 * time.Second,
|
|
Addr: ":" + s.cfg.HTTPPort,
|
|
Handler: router,
|
|
BaseContext: func(_ net.Listener) context.Context { return ctx },
|
|
}
|
|
|
|
return srv
|
|
}
|