admin: Use gin-gonic as router

admin/main.go

@@ -1,9 +1,7 @@
 package main
 
 import (
-	"context"
 	"flag"
-	"fmt"
 	"io/fs"
 	"log"
 	"net/http"
@@ -198,12 +196,12 @@ func main() {
 	os.MkdirAll(settings.SettingsDir, 0777)
 
 	// Initialize settings and load them
+	var config *settings.Settings
 	if !settings.ExistsSettings(path.Join(settings.SettingsDir, settings.SettingsFile)) {
 		if err = api.ResetSettings(); err != nil {
 			log.Fatal("Unable to initialize settings.json:", err)
 		}
 	} else {
-		var config *settings.Settings
 		if config, err = settings.ReadSettings(path.Join(settings.SettingsDir, settings.SettingsFile)); err != nil {
 			log.Fatal("Unable to read settings.json:", err)
 		} else {
@@ -231,21 +229,13 @@ func main() {
 	interrupt := make(chan os.Signal, 1)
 	signal.Notify(interrupt, os.Interrupt, syscall.SIGTERM)
 
-	srv := &http.Server{
-		Addr:    *bind,
-		Handler: StripPrefix(baseURL, api.Router()),
-	}
-
-	// Serve content
-	go func() {
-		log.Fatal(srv.ListenAndServe())
-	}()
-	log.Println(fmt.Sprintf("Ready, listening on %s", *bind))
+	app := NewApp(config, baseURL, *bind)
+	go app.Start()
 
 	// Wait shutdown signal
 	<-interrupt
 
 	log.Print("The service is shutting down...")
-	srv.Shutdown(context.Background())
+	app.Stop()
 	log.Println("done")
 }