로그 포맷 통일, slog 적용

backend/cmd/server/main.go

@@ -1,17 +1,19 @@
 package main
 
 import (
-	"log"
+	"log/slog"
 	"os"
-	"strconv"
+		"strconv"
-
+		"time"
-	"baron-sso-backend/internal/handler"
+	
+		"github.com/bwmarrin/snowflake"
+		"baron-sso-backend/internal/handler"
+	"baron-sso-backend/internal/logger"
 	"baron-sso-backend/internal/repository"
 
 	"github.com/gofiber/fiber/v2"
 	"github.com/gofiber/fiber/v2/middleware/cors"
 	"github.com/gofiber/fiber/v2/middleware/encryptcookie"
-	"github.com/gofiber/fiber/v2/middleware/logger"
 	"github.com/gofiber/fiber/v2/middleware/recover"
 	"github.com/gofiber/fiber/v2/middleware/requestid"
 )
@@ -24,13 +26,25 @@ func getEnv(key, fallback string) string {
 }
 
 func main() {
+	// 0. Initialize Logger
+	logger.Init(logger.Config{
+		ServiceName: "baron-sso",
+		Environment: getEnv("GO_ENV", "dev"),
+	})
+
+	// Initialize Snowflake Node (Node 2 for Baron)
+	node, err := snowflake.NewNode(2)
+	if err != nil {
+		slog.Error("Failed to initialize snowflake node", "error", err)
+		os.Exit(1)
+	}
+
 	// 1. Log Config on Startup
-	log.Println("==========================================")
+	slog.Info("Starting Baron SSO Backend",
-	log.Println("Starting Baron SSO Backend...")
+		"frontend_url", getEnv("FRONTEND_URL", "http://ssologin.hmac.kr"),
-	log.Printf("FRONTEND_URL: %s", getEnv("FRONTEND_URL", "http://ssologin.hmac.kr"))
+		"redis_addr", getEnv("REDIS_ADDR", "redis:6379"),
-	log.Printf("REDIS_ADDR:   %s", getEnv("REDIS_ADDR", "redis:6379"))
+		"descope_id", getEnv("DESCOPE_PROJECT_ID", "not-set"),
-	log.Printf("DESCOPE_ID:   %s", getEnv("DESCOPE_PROJECT_ID", "not-set"))
+	)
-	log.Println("==========================================")
 
 	// 2. Initialize DB Connections
 	chHost := getEnv("CLICKHOUSE_HOST", "localhost")
@@ -41,8 +55,7 @@ func main() {
 
 	auditRepo, err := repository.NewClickHouseRepository(chHost, chPort, chUser, chPass, chDB)
 	if err != nil {
-		log.Printf("Warning: Failed to connect to ClickHouse: %v. Audit logs will fail.", err)
+		slog.Warn("Failed to connect to ClickHouse. Audit logs will fail.", "error", err)
-		// Proceeding mostly for Dev purposes, but in Prod should generally fail or fallback.
 	}
 
 	// 2. Initialize Handlers
@@ -52,17 +65,42 @@ func main() {
 	// 3. Initialize Fiber
 	app := fiber.New(fiber.Config{
 		AppName: "Baron SSO Backend",
+		DisableStartupMessage: true, // Clean logs
 	})
 
 	// Middleware
 	app.Use(requestid.New(requestid.Config{
 		Generator: func() string {
-			return handler.GenerateSecureToken(4) // 8 chars hex
+			return node.Generate().String()
 		},
 	}))
-	app.Use(logger.New(logger.Config{
+
-		Format: "[${time}] ${status} - ${method} ${path}\n",
+	// [Standardized] HTTP Request Logger Middleware using slog
-	}))
+	app.Use(func(c *fiber.Ctx) error {
+		start := time.Now()
+		
+		// Handle request
+		err := c.Next()
+		
+		// Log after request
+		latency := time.Since(start)
+		
+		msg := "http_request"
+		if err != nil {
+			msg = "http_request_error"
+		}
+
+		slog.Info(msg,
+			"status", c.Response().StatusCode(),
+			"method", c.Method(),
+			"path", c.Path(),
+			"latency", latency.String(),
+			"ip", c.IP(),
+			"req_id", c.GetRespHeader(fiber.HeaderXRequestID),
+		)
+		return err
+	})
+
 	app.Use(recover.New())
 	app.Use(cors.New(cors.Config{
 		AllowOrigins: "*", // Adjust in production
@@ -100,21 +138,52 @@ func main() {
 	// Webhook for Descope Generic Email Gateway (Fake Email Strategy)
 	auth.Post("/webhooks/descope-email", authHandler.HandleDescopeEmailRelay)
 
-	// Client Logging Route (For Debugging)
+	// Client Logging Route (Standardized & Flattened)
 	api.Post("/client-log", func(c *fiber.Ctx) error {
 		type LogReq struct {
-			Level   string `json:"level"`
+			Level   string                 `json:"level"`
-			Message string `json:"message"`
+			Message string                 `json:"message"`
+			Data    map[string]interface{} `json:"data,omitempty"`
 		}
 		var req LogReq
 		if err := c.BodyParser(&req); err != nil {
 			return c.SendStatus(fiber.StatusBadRequest)
 		}
-		log.Printf("[CLIENT-LOG] [%s] %s", req.Level, req.Message)
+
+		// Prepare attributes for flattening
+		attrs := []any{
+			slog.String("source", "client"),
+		}
+		for k, v := range req.Data {
+			// Skip svc if it's already set by the global logger to avoid confusion, 
+			// or keep it as client_svc
+			if k == "svc" {
+				attrs = append(attrs, slog.Any("client_svc", v))
+			} else {
+				attrs = append(attrs, slog.Any(k, v))
+			}
+		}
+
+		// Map and log with correct level
+		var level slog.Level
+		switch req.Level {
+		case "SEVERE", "ERROR":
+			level = slog.LevelError
+		case "WARNING", "WARN":
+			level = slog.LevelWarn
+		default:
+			level = slog.LevelInfo
+		}
+
+		slog.Log(c.Context(), level, req.Message, attrs...)
 		return c.SendStatus(fiber.StatusOK)
 	})
 
 	// Start Server
 	port := getEnv("PORT", "3000")
-	log.Fatal(app.Listen(":" + port))
+	slog.Info("Server listening", "port", port)
+	if err := app.Listen(":" + port); err != nil {
+		slog.Error("Server failed to start", "error", err)
+		os.Exit(1)
+	}
 }

backend/go.mod

@@ -12,6 +12,7 @@ require (
 require (
 	github.com/ClickHouse/ch-go v0.69.0 // indirect
 	github.com/andybalholm/brotli v1.2.0 // indirect
+	github.com/bwmarrin/snowflake v0.3.0 // indirect
 	github.com/cespare/xxhash/v2 v2.3.0 // indirect
 	github.com/decred/dcrd/dcrec/secp256k1/v4 v4.4.0 // indirect
 	github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f // indirect

backend/go.sum

@@ -4,6 +4,8 @@ github.com/ClickHouse/clickhouse-go/v2 v2.42.0 h1:MdujEfIrpXesQUH0k0AnuVtJQXk6RZ
 github.com/ClickHouse/clickhouse-go/v2 v2.42.0/go.mod h1:riWnuo4YMVdajYll0q6FzRBomdyCrXyFY3VXeXczA8s=
 github.com/andybalholm/brotli v1.2.0 h1:ukwgCxwYrmACq68yiUqwIWnGY0cTPox/M94sVwToPjQ=
 github.com/andybalholm/brotli v1.2.0/go.mod h1:rzTDkvFWvIrjDXZHkuS16NPggd91W3kUSvPlQ1pLaKY=
+github.com/bwmarrin/snowflake v0.3.0 h1:xm67bEhkKh6ij1790JB83OujPR5CzNe8QuQqAgISZN0=
+github.com/bwmarrin/snowflake v0.3.0/go.mod h1:NdZxfVWX+oR6y2K0o6qAYv6gIOP9rjG0/E9WsDpxqwE=
 github.com/cespare/xxhash/v2 v2.3.0 h1:UL815xU9SqsFlibzuggzjXhog7bL6oX9BbNZnL2UFvs=
 github.com/cespare/xxhash/v2 v2.3.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=

backend/internal/logger/logger.go

@@ -0,0 +1,49 @@
+package logger
+
+import (
+	"log/slog"
+	"os"
+	"strings"
+)
+
+// Config holds the logger configuration
+type Config struct {
+	ServiceName string
+	Environment string // "dev", "local", "production"
+}
+
+// Init initializes the global logger with slog.
+// It detects the environment to switch between TextHandler (dev) and JSONHandler (prod).
+func Init(cfg Config) {
+	var handler slog.Handler
+
+	opts := &slog.HandlerOptions{
+		// Default level
+		Level: slog.LevelInfo,
+		// Customize attributes (Time format)
+		ReplaceAttr: func(groups []string, a slog.Attr) slog.Attr {
+			if a.Key == slog.TimeKey {
+				return slog.String(a.Key, a.Value.Time().Format("2006-01-02 15:04:05"))
+			}
+			return a
+		},
+	}
+
+	// Adjust level and format based on environment
+	env := strings.ToLower(cfg.Environment)
+	if env == "dev" || env == "local" || env == "development" {
+		opts.Level = slog.LevelDebug
+		handler = slog.NewTextHandler(os.Stdout, opts)
+	} else {
+		// Production defaults to JSON
+		handler = slog.NewJSONHandler(os.Stdout, opts)
+	}
+
+	// Create logger with common attributes
+	logger := slog.New(handler).With(
+		slog.String("svc", cfg.ServiceName),
+	)
+
+	// Set as global default logger
+	slog.SetDefault(logger)
+}

frontend/lib/core/services/auth_proxy_service.dart

@@ -99,19 +99,28 @@ class AuthProxyService {
     }
   }
 
-  static Future<void> logError(String message) async {
+  static Future<void> sendLog(String level, String message, {Map<String, dynamic>? data}) async {
     final url = Uri.parse('$_baseUrl/api/v1/client-log');
     try {
       await http.post(
         url,
         headers: {'Content-Type': 'application/json'},
         body: jsonEncode({
-          'level': 'ERROR',
+          'level': level,
           'message': message,
+          if (data != null) 'data': data,
         }),
       );
     } catch (_) {
       // Ignore logging errors to prevent loops
     }
   }
+
+  static Future<void> logError(String message, {dynamic error, StackTrace? stackTrace}) async {
+    final data = <String, dynamic>{};
+    if (error != null) data['error'] = error.toString();
+    if (stackTrace != null) data['stack'] = stackTrace.toString();
+    
+    await sendLog('ERROR', message, data: data);
+  }
 }

frontend/lib/core/services/logger_service.dart

@@ -0,0 +1,86 @@
+import 'dart:convert';
+import 'package:flutter/foundation.dart';
+import 'package:logging/logging.dart' as std_log;
+import 'package:logger/logger.dart' as pretty_log;
+import 'auth_proxy_service.dart';
+
+/// Global Logger Service for Baron SSO Frontend
+class LoggerService {
+  static final LoggerService _instance = LoggerService._internal();
+  factory LoggerService() => _instance;
+
+  late final pretty_log.Logger _prettyLogger;
+
+  LoggerService._internal() {
+    // 1. Initialize Pretty Logger for Dev
+    _prettyLogger = pretty_log.Logger(
+      printer: pretty_log.PrettyPrinter(
+        methodCount: 0,
+        errorMethodCount: 8,
+        lineLength: 120,
+        colors: true,
+        printEmojis: true,
+        dateTimeFormat: pretty_log.DateTimeFormat.onlyTimeAndSinceStart,
+      ),
+    );
+
+    // 2. Configure Standard Logger (logging package)
+    std_log.Logger.root.level = kReleaseMode ? std_log.Level.INFO : std_log.Level.ALL;
+    
+    std_log.Logger.root.onRecord.listen((record) {
+      if (kReleaseMode) {
+        // [Production] Log as JSON
+        _logJson(record);
+      } else {
+        // [Development] Log using Pretty Printer
+        _logPretty(record);
+      }
+    });
+  }
+
+  /// Initialize the logger. Call this in main.dart
+  static void init() {
+    // Accessing the instance triggers the constructor
+    LoggerService(); 
+    std_log.Logger('BaronSSO').info('Logger initialized');
+  }
+
+  void _logPretty(std_log.LogRecord record) {
+    if (record.level >= std_log.Level.SEVERE) {
+      _prettyLogger.e(record.message, error: record.error, stackTrace: record.stackTrace);
+    } else if (record.level >= std_log.Level.WARNING) {
+      _prettyLogger.w(record.message);
+    } else if (record.level >= std_log.Level.INFO) {
+      _prettyLogger.i(record.message);
+    } else {
+      _prettyLogger.d(record.message);
+    }
+  }
+
+  void _logJson(std_log.LogRecord record) {
+    final logData = {
+      'time': record.time.toUtc().toIso8601String(), // Use UTC for consistency
+      'level': record.level.name,
+      'msg': record.message,
+      'svc': 'baron-frontend',
+      if (record.error != null) 'error': record.error.toString(),
+      if (record.stackTrace != null) 'stack': record.stackTrace.toString(),
+    };
+    
+    // 1. Print to Browser Console (F12)
+    debugPrint(jsonEncode(logData));
+
+    // 2. Relay to Backend (Docker Terminal)
+    if (record.level >= std_log.Level.INFO) {
+      AuthProxyService.sendLog(
+        record.level.name,
+        record.message,
+        data: {
+          'client_time': record.time.toUtc().toIso8601String(),
+          'logger': record.loggerName,
+          if (record.error != null) 'error': record.error.toString(),
+        },
+      );
+    }
+  }
+}

frontend/lib/main.dart

@@ -9,18 +9,28 @@ import 'package:flutter_web_plugins/url_strategy.dart';
 import 'features/auth/presentation/login_screen.dart';
 import 'features/dashboard/presentation/dashboard_screen.dart';
 import 'core/services/auth_proxy_service.dart';
+import 'core/services/logger_service.dart';
+import 'package:logging/logging.dart';
+
+final _log = Logger('Main');
 
 void main() async {
   WidgetsFlutterBinding.ensureInitialized();
   usePathUrlStrategy();
+  
+  // 0. Initialize Logger
+  LoggerService.init();
 
   // 1. Global Error Handling
   FlutterError.onError = (details) {
     FlutterError.presentError(details);
+    _log.severe("FLUTTER_ERROR", details.exception, details.stack);
+    // Also send to backend if needed
     AuthProxyService.logError("FLUTTER_ERROR: ${details.exception}\n${details.stack}");
   };
 
   PlatformDispatcher.instance.onError = (error, stack) {
+    _log.severe("PLATFORM_ERROR", error, stack);
     AuthProxyService.logError("PLATFORM_ERROR: $error\n$stack");
     return true;
   };
@@ -29,7 +39,7 @@ void main() async {
   try {
     await dotenv.load(fileName: ".env");
   } catch (e) {
-    debugPrint("Warning: .env file not found.");
+    _log.warning("Warning: .env file not found.");
   }
 
   // Initialize Descope
@@ -40,13 +50,15 @@ void main() async {
   try {
     await Descope.sessionManager.loadSession();
   } catch (e) {
-    debugPrint("Failed to load session: $e");
+    _log.warning("Failed to load session: $e");
   }
 
   runApp(const ProviderScope(child: BaronSSOApp()));
 }
 
 // Router Configuration
+final _routerLogger = Logger('Router');
+
 final _router = GoRouter(
   initialLocation: '/',
   debugLogDiagnostics: true, // Enable diagnostic logs
@@ -54,7 +66,7 @@ final _router = GoRouter(
     GoRoute(
       path: '/', 
       builder: (context, state) {
-        debugPrint("[Router] Navigating to root (LoginScreen)");
+        _routerLogger.info("Navigating to root (LoginScreen)");
         return const LoginScreen();
       }
     ),
@@ -62,14 +74,14 @@ final _router = GoRouter(
       path: '/verify/:token',
       builder: (context, state) {
         final token = state.pathParameters['token'];
-        debugPrint("[Router] Navigating to /verify with token: $token");
+        _routerLogger.info("Navigating to /verify with token: $token");
         return LoginScreen(verificationToken: token);
       },
     ),
     GoRoute(
       path: '/dashboard',
       builder: (context, state) {
-        debugPrint("[Router] Navigating to /dashboard");
+        _routerLogger.info("Navigating to /dashboard");
         return const DashboardScreen();
       },
     ),
@@ -80,14 +92,14 @@ final _router = GoRouter(
     final path = state.uri.path;
     final isLoggingIn = path == '/' || path.startsWith('/verify/');
 
-    debugPrint("[Router] Redirect check - Path: $path, IsLoggedIn: $isLoggedIn");
+    _routerLogger.fine("Redirect check - Path: $path, IsLoggedIn: $isLoggedIn");
 
     if (!isLoggedIn && !isLoggingIn) {
-      debugPrint("[Router] Not logged in, redirecting to /");
+      _routerLogger.info("Not logged in, redirecting to /");
       return '/';
     }
     if (isLoggedIn && path == '/') {
-      debugPrint("[Router] Logged in, redirecting to /dashboard");
+      _routerLogger.info("Logged in, redirecting to /dashboard");
       return '/dashboard';
     }
 

frontend/nginx.conf

@@ -1,5 +1,29 @@
+# Map ISO8601 time to "YYYY-MM-DD HH:mm:ss" format
+map $time_iso8601 $time_custom {
+    "~^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2})" "$1-$2-$3 $4:$5:$6";
+}
+
+# Custom JSON Log Format matching Go slog
+log_format json_combined escape=json
+    '{'
+    '"time":"$time_custom",'
+    '"level":"INFO",'
+    '"msg":"http_access",'
+    '"svc":"baron-frontend",'
+    '"status":$status,'
+    '"method":"$request_method",'
+    '"path":"$request_uri",'
+    '"latency":"${request_time}s",'
+    '"ip":"$remote_addr",'
+    '"forwarded_for":"$http_x_forwarded_for",'
+    '"user_agent":"$http_user_agent"'
+    '}';
+
 server {
     listen 5000;
+    include /etc/nginx/mime.types;
+    
+    access_log /var/log/nginx/access.log json_combined;
 
     # Backend API Proxy
     location /api {

frontend/pubspec.yaml

@@ -41,6 +41,8 @@ dependencies:
   google_fonts: ^6.3.3
   flutter_dotenv: ^5.1.0
   url_launcher: ^6.3.2
+  logging: ^1.2.0
+  logger: ^2.0.0
 
 dev_dependencies:
   flutter_test: