Rework stats server

stats/server.go

@@ -3,45 +3,19 @@ package stats
 import (
 	"encoding/json"
 	"net/http"
-	"sync"
-	"time"
 
 	"go.uber.org/zap"
 
 	"github.com/9seconds/mtg/config"
 )
 
-var instance *stats
-
-// Start starts new statistics server.
-func Start(conf *config.Config) error {
+func startServer(conf *config.Config) {
 	log := zap.S().Named("stats")
 
-	instance = &stats{
-		URLs:   conf.GetURLs(),
-		Uptime: uptime(time.Now()),
-		mutex:  &sync.RWMutex{},
-	}
-
-	if conf.StatsD.Enabled {
-		client, err := newStatsd(conf)
-		if err != nil {
-			return err
-		}
-		go client.run()
-	}
-
-	go crashManager()
-	go connectionManager()
-	go trafficManager()
-
 	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
 		w.Header().Set("Content-Type", "application/json")
 
-		instance.mutex.Lock()
-		first, err := json.Marshal(instance)
-		instance.mutex.Unlock()
-
+		first, err := json.Marshal(GetStats())
 		if err != nil {
 			log.Errorw("Cannot encode json", "error", err)
 			http.Error(w, "Internal server error", 500)
@@ -59,11 +33,7 @@ func Start(conf *config.Config) error {
 		}
 	})
 
-	go func() {
-		if err := http.ListenAndServe(conf.StatAddr(), nil); err != nil {
-			log.Fatalw("Stats server has been stopped", "error", err)
-		}
-	}()
-
-	return nil
+	if err := http.ListenAndServe(conf.StatAddr(), nil); err != nil {
+		log.Fatalw("Stats server has been stopped", "error", err)
+	}
 }