refactor: impl health checks, graceful shutdown & structured logging

internal/api/auth_handler.go

@@ -3,7 +3,7 @@ package api
 import (
 	"encoding/json"
 	"errors"
-	"log"
+	"log/slog"
 	"net/http"
 
 	"gitea.mrixs.me/minecraft-platform/backend/internal/core"
@@ -40,7 +40,7 @@ func (h *AuthHandler) Authenticate(w http.ResponseWriter, r *http.Request) {
 		}
 
 		// Другие ошибки - внутренние
-		log.Printf("internal server error during authentication: %v", err)
+		slog.Error("internal server error during authentication", "error", err)
 		http.Error(w, "Internal server error", http.StatusInternalServerError)
 		return
 	}
@@ -69,7 +69,7 @@ func (h *AuthHandler) Join(w http.ResponseWriter, r *http.Request) {
 			return
 		}
 
-		log.Printf("internal server error during join: %v", err)
+		slog.Error("internal server error during join", "error", err)
 		http.Error(w, "Internal server error", http.StatusInternalServerError)
 		return
 	}
@@ -90,7 +90,7 @@ func (h *AuthHandler) Login(w http.ResponseWriter, r *http.Request) {
 			http.Error(w, "Invalid username or password", http.StatusUnauthorized)
 			return
 		}
-		log.Printf("internal server error during login: %v", err)
+		slog.Error("internal server error during login", "error", err)
 		http.Error(w, "Internal server error", http.StatusInternalServerError)
 		return
 	}

internal/core/server_poller.go

@@ -3,7 +3,7 @@ package core
 import (
 	"context"
 	"encoding/json"
-	"log"
+	"log/slog"
 	"time"
 
 	"gitea.mrixs.me/minecraft-platform/backend/internal/database"
@@ -29,7 +29,7 @@ type ServerPoller struct {
 }
 
 func (p *ServerPoller) Start(ctx context.Context) {
-	log.Println("Starting server poller...")
+	slog.Info("Starting server poller...")
 	ticker := time.NewTicker(60 * time.Second)
 	defer ticker.Stop()
 
@@ -40,7 +40,7 @@ func (p *ServerPoller) Start(ctx context.Context) {
 		case <-ticker.C:
 			p.pollAllServers(ctx)
 		case <-ctx.Done():
-			log.Println("Stopping server poller...")
+			slog.Info("Stopping server poller...")
 			return
 		}
 	}
@@ -49,7 +49,7 @@ func (p *ServerPoller) Start(ctx context.Context) {
 func (p *ServerPoller) pollAllServers(ctx context.Context) {
 	servers, err := p.Repo.GetAllEnabledServers(ctx)
 	if err != nil {
-		log.Printf("Poller: failed to get servers: %v", err)
+		slog.Error("Poller: failed to get servers", "error", err)
 		return
 	}
 
@@ -61,13 +61,13 @@ func (p *ServerPoller) pollAllServers(ctx context.Context) {
 func (p *ServerPoller) pollServer(ctx context.Context, server *models.GameServer) {
 	resp, delay, err := bot.PingAndList(server.Address)
 	if err != nil {
-		log.Printf("Poller: failed to ping %s (%s): %v", server.Name, server.Address, err)
+		slog.Warn("Poller: failed to ping server", "server", server.Name, "address", server.Address, "error", err)
 		return
 	}
 
 	var status pingResponse
 	if err := json.Unmarshal(resp, &status); err != nil {
-		log.Printf("Poller: failed to unmarshal status for %s: %v", server.Name, err)
+		slog.Error("Poller: failed to unmarshal status", "server", server.Name, "error", err)
 		return
 	}
 
@@ -83,8 +83,8 @@ func (p *ServerPoller) pollServer(ctx context.Context, server *models.GameServer
 	}
 
 	if err := p.Repo.UpdateServerStatus(ctx, server.ID, updateData); err != nil {
-		log.Printf("Poller: failed to update status for %s: %v", server.Name, err)
+		slog.Error("Poller: failed to update status", "server", server.Name, "error", err)
 	} else {
-		log.Printf("Poller: successfully polled %s", server.Name)
+		slog.Info("Poller: successfully polled server", "server", server.Name)
 	}
 }