feat: 日志持久化存储到文件+管理员后台查看/清空日志页面

backend/internal/api/handlers/log.go

@@ -0,0 +1,74 @@
+package handlers
+
+import (
+	"fmt"
+	"net/http"
+	"strconv"
+
+	"sale/internal/utils"
+
+	"github.com/gin-gonic/gin"
+)
+
+type LogHandler struct{}
+
+func NewLogHandler() *LogHandler {
+	return &LogHandler{}
+}
+
+func (h *LogHandler) GetLogs(c *gin.Context) {
+	lines := 500
+	if l := c.Query("lines"); l != "" {
+		if v, err := strconv.Atoi(l); err == nil && v > 0 {
+			lines = v
+		}
+	}
+
+	logs, err := utils.GetLogs(lines)
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to read logs"})
+		return
+	}
+
+	c.JSON(http.StatusOK, gin.H{"data": logs})
+}
+
+func (h *LogHandler) ClearLogs(c *gin.Context) {
+	if err := utils.ClearLogs(); err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to clear logs"})
+		return
+	}
+
+	c.JSON(http.StatusOK, gin.H{"message": "Logs cleared successfully"})
+}
+
+func (h *LogHandler) GetLogInfo(c *gin.Context) {
+	size, err := utils.GetLogSize()
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to get log info"})
+		return
+	}
+
+	modTime, err := utils.GetLogModTime()
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to get log info"})
+		return
+	}
+
+	var sizeStr string
+	if size >= 1024*1024 {
+		sizeStr = fmt.Sprintf("%.2f MB", float64(size)/(1024*1024))
+	} else if size >= 1024 {
+		sizeStr = fmt.Sprintf("%.2f KB", float64(size)/1024)
+	} else {
+		sizeStr = fmt.Sprintf("%d B", size)
+	}
+
+	c.JSON(http.StatusOK, gin.H{
+		"data": gin.H{
+			"size":     size,
+			"size_str": sizeStr,
+			"mod_time": modTime,
+		},
+	})
+}