Change logrus to slog

Signed-off-by: Asai Neko <sugar@sne.moe>

logger/logrus.go

@@ -1,46 +0,0 @@
-package logger
-
-import (
-	"io"
-	"os"
-
-	"github.com/gin-gonic/gin"
-	"github.com/sirupsen/logrus"
-)
-
-func Init() {
-	levelStr := os.Getenv("LOG_LEVEL")
-	level, err := logrus.ParseLevel(levelStr)
-	if err != nil {
-		level = logrus.InfoLevel
-	}
-	logrus.SetLevel(level)
-
-	if level == logrus.DebugLevel {
-		gin.SetMode(gin.DebugMode)
-	} else {
-		gin.SetMode(gin.ReleaseMode)
-		gin.DisableConsoleColor()
-	}
-
-	logrus.SetFormatter(&logrus.JSONFormatter{
-		TimestampFormat: "2006-01-02 15:04:05",
-	})
-
-	logrus.SetReportCaller(true)
-
-	file, err := os.OpenFile("app.log", os.O_APPEND|os.O_CREATE|os.O_RDWR, 0666)
-	if err != nil {
-		logrus.SetOutput(os.Stdout)
-		logrus.Errorf("Error to create log file: %v", err)
-	} else {
-		logrus.SetOutput(io.MultiWriter(os.Stdout, file))
-	}
-
-	logrus.RegisterExitHandler(func() {
-		if file != nil {
-			file.Sync()
-			file.Close()
-		}
-	})
-}

logger/slog.go

@@ -0,0 +1,47 @@
+package logger
+
+import (
+	"io"
+	"log/slog"
+	"os"
+	"strings"
+)
+
+func Init() {
+	levelStr := strings.ToLower(os.Getenv("LOG_LEVEL"))
+	var level slog.Level
+	switch levelStr {
+	case "debug":
+		level = slog.LevelDebug
+	case "warn":
+		level = slog.LevelWarn
+	case "error":
+		level = slog.LevelError
+	default:
+		level = slog.LevelInfo
+	}
+
+	file, err := os.OpenFile("app.log", os.O_APPEND|os.O_CREATE|os.O_RDWR, 0666)
+	var writer io.Writer = os.Stdout
+	if err != nil {
+		slog.Error("Error to create log file", "err", err)
+	} else {
+		writer = io.MultiWriter(os.Stdout, file)
+	}
+
+	opts := &slog.HandlerOptions{
+		Level:     level,
+		AddSource: true,
+		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
+		},
+	}
+
+	handler := slog.NewJSONHandler(writer, opts)
+
+	logger := slog.New(handler)
+	slog.SetDefault(logger)
+}