chore: initial commit

internal/pkg/logger/logger.go

@@ -0,0 +1,76 @@
+package logger
+
+import (
+	"io"
+	"log/slog"
+	"os"
+	"strings"
+
+	"server/internal/config"
+
+	"gopkg.in/natefinch/lumberjack.v2"
+)
+
+// New 根据配置创建 slog.Logger，并将其设置为默认 logger。
+// 日志会写入文件（自动按大小/时间滚动），并可选同时输出到控制台。
+func New(cfg *config.Config) *slog.Logger {
+	logCfg := cfg.Log
+
+	// 文件滚动写入
+	fileWriter := &lumberjack.Logger{
+		Filename:   defaultStr(logCfg.Filename, "logs/app.log"),
+		MaxSize:    defaultInt(logCfg.MaxSize, 100), // MB
+		MaxBackups: defaultInt(logCfg.MaxBackups, 30),
+		MaxAge:     defaultInt(logCfg.MaxAge, 30), // days
+		Compress:   logCfg.Compress,
+	}
+
+	var writer io.Writer = fileWriter
+	if logCfg.Console {
+		writer = io.MultiWriter(os.Stdout, fileWriter)
+	}
+
+	opts := &slog.HandlerOptions{
+		Level:     parseLevel(logCfg.Level),
+		AddSource: false,
+	}
+
+	// 生产环境用 JSON，便于日志采集/检索；开发环境用文本更易读
+	var handler slog.Handler
+	if config.IsDev() {
+		handler = slog.NewTextHandler(writer, opts)
+	} else {
+		handler = slog.NewJSONHandler(writer, opts)
+	}
+
+	l := slog.New(handler)
+	slog.SetDefault(l) // 让全局 slog.Info/Error 也走同一套配置
+	return l
+}
+
+func parseLevel(level string) slog.Level {
+	switch strings.ToLower(level) {
+	case "debug":
+		return slog.LevelDebug
+	case "warn", "warning":
+		return slog.LevelWarn
+	case "error":
+		return slog.LevelError
+	default:
+		return slog.LevelInfo
+	}
+}
+
+func defaultStr(v, def string) string {
+	if v == "" {
+		return def
+	}
+	return v
+}
+
+func defaultInt(v, def int) int {
+	if v <= 0 {
+		return def
+	}
+	return v
+}