增加过滤已拉取封面的逻辑，及去除请求ctx

crawler.go

@@ -2,7 +2,6 @@ package main
 
 import (
 	"bytes"
-	"context"
 	"errors"
 	"fmt"
 	"github.com/spf13/viper"
@@ -69,6 +68,12 @@ func (c *Crawler) isVideoFile(fileName string) bool {
 	return false
 }
 
+// 检查文件是否是 JPG 文件
+func (c *Crawler) isJPGFile(fileName string) bool {
+	ext := strings.ToLower(filepath.Ext(fileName))
+	return ext == ".jpg"
+}
+
 // 获取文件 CRC32 哈希值
 func (c *Crawler) getFileInfo(filePath string) (uint32, error) {
 	file, err := os.Open(filePath)
@@ -157,7 +162,6 @@ func (c *Crawler) fetchCoverImg(code coverCode) error {
 
 	imgUrl := c.getCoverImgUrl(code)
 	suffix := filepath.Ext(imgUrl)
-
 	fileName := fmt.Sprintf("%s-%03d%s",
 		strings.ToUpper(code.letters),
 		code.number,
@@ -165,11 +169,7 @@ func (c *Crawler) fetchCoverImg(code coverCode) error {
 	)
 	filePath := filepath.Join(c.outputPath, fileName)
 
-	// 使用带超时的上下文
-	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
-	defer cancel()
-
-	req, err := http.NewRequestWithContext(ctx, "GET", imgUrl, nil)
+	req, err := http.NewRequest(http.MethodGet, imgUrl, nil)
 	if err != nil {
 		return fmt.Errorf("创建请求失败: %w", err)
 	}
@@ -218,15 +218,10 @@ func (c *Crawler) fetchCoverImg(code coverCode) error {
 	return nil
 }
 
-func (c *Crawler) Handle() error {
-	if c.avPath == "未选择" || c.outputPath == "未选择" {
-		return errors.New("请选择作品存放目录或输出目录")
-	}
-
-	// 用于去重的集合
+// 获取作品存放目录视频文件列表
+func (c *Crawler) getAVPathVideoList() (videoFiles []string, err error) {
+	// 用于去重
 	uniqueFiles := make(map[string]struct{})
-	var videoFiles []string
-
 	if err := filepath.Walk(c.avPath, func(path string, info os.FileInfo, err error) error {
 		if err != nil {
 			return fmt.Errorf("访问路径 %s 失败: %w", path, err)
@@ -258,19 +253,87 @@ func (c *Crawler) Handle() error {
 		}
 		return nil
 	}); err != nil {
-		return fmt.Errorf("目录遍历失败: %w", err)
+		return nil, fmt.Errorf("作品存放目录遍历失败: %w", err)
+	}
+
+	return videoFiles, nil
+}
+
+// 获取输出目录已存在的封面列表
+func (c *Crawler) getOutPathCoverList() (coverList []coverCode, err error) {
+	// 用于去重
+	uniqueFiles := make(map[string]struct{})
+	if err := filepath.Walk(c.avPath, func(path string, info os.FileInfo, err error) error {
+		if err != nil {
+			return fmt.Errorf("访问路径 %s 失败: %w", path, err)
+		}
+
+		// 目录过滤
+		if info.IsDir() {
+			return nil
+		}
+
+		// 仅处理图片文件
+		if !c.isJPGFile(info.Name()) {
+			return nil
+		}
+
+		baseName := strings.TrimSuffix(info.Name(), filepath.Ext(info.Name()))
+		if _, exists := uniqueFiles[baseName]; !exists {
+			uniqueFiles[baseName] = struct{}{}
+			nameSlice := strings.Split(baseName, "-")
+			coverList = append(coverList, coverCode{
+				letters: strings.ToLower(nameSlice[0]),
+				number:  c.getCodeNum(nameSlice[1]),
+			})
+		}
+		return nil
+	}); err != nil {
+		return nil, fmt.Errorf("输出目录遍历失败: %w", err)
+	}
+
+	return coverList, nil
+}
+
+func (c *Crawler) Handle() error {
+	if c.avPath == "未选择" || c.outputPath == "未选择" {
+		return errors.New("请选择作品存放目录或输出目录")
+	}
+
+	videoFiles, err := c.getAVPathVideoList()
+	if err != nil {
+		return err
 	}
 
 	coverList := c.getCoverCodeList(videoFiles)
+	existCovers, err := c.getOutPathCoverList()
+	if err != nil {
+		return err
+	}
+
+	// 过滤已存在的封面
+	if len(existCovers) > 0 {
+		// 创建哈希表用于快速查找
+		existMap := make(map[coverCode]struct{})
+		for _, c := range existCovers {
+			existMap[c] = struct{}{}
+		}
+
+		// 创建新切片过滤已存在项
+		filtered := make([]coverCode, 0, len(coverList))
+		for _, item := range coverList {
+			if _, exists := existMap[item]; !exists {
+				filtered = append(filtered, item)
+			}
+		}
+
+		coverList = filtered
+	}
 
 	var g errgroup.Group
 	for _, cover := range coverList {
 		g.Go(func() error {
-			if err := c.fetchCoverImg(cover); err != nil {
-				return err
-			}
-
-			return nil
+			return c.fetchCoverImg(cover)
 		})
 	}