refactor: introduce Wire dependency injection and interface-based architecture
- Add Google Wire for compile-time dependency injection - Replace concrete service types with interfaces across handlers - Remove global state (DB, cache) in favor of constructor injection - Split monolithic files into focused modules: - config: separate files for each config domain - dto: converters split by domain (user, post, message, group) - cache: separate metrics.go and redis_cache.go - Introduce unified apperrors package with string-based error codes - Add transaction support with context-aware repository methods - Upgrade golang.org/x/crypto from 0.17.0 to 0.26.0
This commit is contained in:
282
internal/dto/post_converter.go
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282
internal/dto/post_converter.go
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package dto
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import (
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"carrot_bbs/internal/model"
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"context"
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"encoding/json"
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)
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// ==================== Post 转换 ====================
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// ConvertPostImageToResponse 将PostImage转换为PostImageResponse
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func ConvertPostImageToResponse(img *model.PostImage) PostImageResponse {
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if img == nil {
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return PostImageResponse{}
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}
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return PostImageResponse{
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ID: img.ID,
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URL: img.URL,
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ThumbnailURL: img.ThumbnailURL,
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Width: img.Width,
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Height: img.Height,
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}
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}
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// ConvertPostImagesToResponse 将PostImage列表转换为响应列表
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func ConvertPostImagesToResponse(images []model.PostImage) []PostImageResponse {
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result := make([]PostImageResponse, 0, len(images))
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for i := range images {
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result = append(result, ConvertPostImageToResponse(&images[i]))
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}
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return result
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}
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// ConvertPostToResponse 将Post转换为PostResponse（列表用）
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func ConvertPostToResponse(post *model.Post, isLiked, isFavorited bool) *PostResponse {
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if post == nil {
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return nil
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}
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images := make([]PostImageResponse, 0)
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for _, img := range post.Images {
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images = append(images, ConvertPostImageToResponse(&img))
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}
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var author *UserResponse
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if post.User != nil {
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author = ConvertUserToResponse(post.User)
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}
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return &PostResponse{
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ID: post.ID,
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UserID: post.UserID,
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Title: post.Title,
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Content: post.Content,
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Images: images,
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Status: string(post.Status),
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LikesCount: post.LikesCount,
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CommentsCount: post.CommentsCount,
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FavoritesCount: post.FavoritesCount,
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SharesCount: post.SharesCount,
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ViewsCount: post.ViewsCount,
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IsPinned: post.IsPinned,
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IsLocked: post.IsLocked,
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IsVote: post.IsVote,
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CreatedAt: FormatTime(post.CreatedAt),
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UpdatedAt: FormatTime(post.UpdatedAt),
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Author: author,
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IsLiked: isLiked,
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IsFavorited: isFavorited,
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}
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}
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// ConvertPostToDetailResponse 将Post转换为PostDetailResponse
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func ConvertPostToDetailResponse(post *model.Post, isLiked, isFavorited bool) *PostDetailResponse {
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if post == nil {
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return nil
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}
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images := make([]PostImageResponse, 0)
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for _, img := range post.Images {
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images = append(images, ConvertPostImageToResponse(&img))
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}
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var author *UserResponse
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if post.User != nil {
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author = ConvertUserToResponse(post.User)
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}
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return &PostDetailResponse{
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ID: post.ID,
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UserID: post.UserID,
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Title: post.Title,
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Content: post.Content,
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Images: images,
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Status: string(post.Status),
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LikesCount: post.LikesCount,
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CommentsCount: post.CommentsCount,
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FavoritesCount: post.FavoritesCount,
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SharesCount: post.SharesCount,
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ViewsCount: post.ViewsCount,
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IsPinned: post.IsPinned,
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IsLocked: post.IsLocked,
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IsVote: post.IsVote,
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CreatedAt: FormatTime(post.CreatedAt),
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UpdatedAt: FormatTime(post.UpdatedAt),
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Author: author,
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IsLiked: isLiked,
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IsFavorited: isFavorited,
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}
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}
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// ConvertPostsToResponse 将Post列表转换为响应列表（每个帖子独立检查点赞/收藏状态）
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func ConvertPostsToResponse(posts []*model.Post, isLikedMap, isFavoritedMap map[string]bool) []*PostResponse {
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result := make([]*PostResponse, 0, len(posts))
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for _, post := range posts {
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isLiked := false
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isFavorited := false
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if isLikedMap != nil {
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isLiked = isLikedMap[post.ID]
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}
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if isFavoritedMap != nil {
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isFavorited = isFavoritedMap[post.ID]
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}
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result = append(result, ConvertPostToResponse(post, isLiked, isFavorited))
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}
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return result
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}
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// BuildPostResponse 构建单个帖子响应（包含交互状态）
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// 这是一个语义化的辅助函数，便于 Handler 层调用
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func BuildPostResponse(post *model.Post, isLiked, isFavorited bool) *PostResponse {
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return ConvertPostToResponse(post, isLiked, isFavorited)
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}
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// BuildPostsWithInteractionResponse 批量构建帖子响应（包含交互状态）
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// 这是一个语义化的辅助函数，便于 Handler 层调用
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func BuildPostsWithInteractionResponse(posts []*model.Post, isLikedMap, isFavoritedMap map[string]bool) []*PostResponse {
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return ConvertPostsToResponse(posts, isLikedMap, isFavoritedMap)
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}
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// ==================== Comment 转换 ====================
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// ConvertCommentToResponse 将Comment转换为CommentResponse
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func ConvertCommentToResponse(comment *model.Comment, isLiked bool) *CommentResponse {
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if comment == nil {
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return nil
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}
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var author *UserResponse
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if comment.User != nil {
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author = ConvertUserToResponse(comment.User)
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}
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// 转换子回复（扁平化结构）
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var replies []*CommentResponse
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if len(comment.Replies) > 0 {
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replies = make([]*CommentResponse, 0, len(comment.Replies))
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for _, reply := range comment.Replies {
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replies = append(replies, ConvertCommentToResponse(reply, false))
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}
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}
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// TargetID 就是 ParentID，前端根据这个 ID 找到被回复用户的昵称
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var targetID *string
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if comment.ParentID != nil && *comment.ParentID != "" {
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targetID = comment.ParentID
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}
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// 解析图片JSON
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var images []CommentImageResponse
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if comment.Images != "" {
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var urlList []string
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if err := json.Unmarshal([]byte(comment.Images), &urlList); err == nil {
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images = make([]CommentImageResponse, 0, len(urlList))
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for _, url := range urlList {
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images = append(images, CommentImageResponse{URL: url})
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}
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}
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}
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return &CommentResponse{
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ID: comment.ID,
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PostID: comment.PostID,
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UserID: comment.UserID,
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ParentID: comment.ParentID,
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RootID: comment.RootID,
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Content: comment.Content,
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Images: images,
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LikesCount: comment.LikesCount,
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RepliesCount: comment.RepliesCount,
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CreatedAt: FormatTime(comment.CreatedAt),
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Author: author,
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IsLiked: isLiked,
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TargetID: targetID,
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Replies: replies,
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}
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}
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// ConvertCommentsToResponse 将Comment列表转换为响应列表
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func ConvertCommentsToResponse(comments []*model.Comment, isLiked bool) []*CommentResponse {
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result := make([]*CommentResponse, 0, len(comments))
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for _, comment := range comments {
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result = append(result, ConvertCommentToResponse(comment, isLiked))
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}
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return result
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}
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// IsLikedChecker 点赞状态检查器接口
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type IsLikedChecker interface {
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IsLiked(ctx context.Context, commentID, userID string) bool
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}
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// ConvertCommentToResponseWithUser 将Comment转换为CommentResponse（根据用户ID检查点赞状态）
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func ConvertCommentToResponseWithUser(comment *model.Comment, userID string, checker IsLikedChecker) *CommentResponse {
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if comment == nil {
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return nil
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}
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// 检查当前用户是否点赞了该评论
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isLiked := false
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if userID != "" && checker != nil {
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isLiked = checker.IsLiked(context.Background(), comment.ID, userID)
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}
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var author *UserResponse
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if comment.User != nil {
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author = ConvertUserToResponse(comment.User)
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}
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// 转换子回复（扁平化结构），递归检查点赞状态
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var replies []*CommentResponse
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if len(comment.Replies) > 0 {
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replies = make([]*CommentResponse, 0, len(comment.Replies))
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for _, reply := range comment.Replies {
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replies = append(replies, ConvertCommentToResponseWithUser(reply, userID, checker))
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}
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}
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// TargetID 就是 ParentID，前端根据这个 ID 找到被回复用户的昵称
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var targetID *string
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if comment.ParentID != nil && *comment.ParentID != "" {
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targetID = comment.ParentID
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}
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// 解析图片JSON
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var images []CommentImageResponse
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if comment.Images != "" {
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var urlList []string
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if err := json.Unmarshal([]byte(comment.Images), &urlList); err == nil {
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images = make([]CommentImageResponse, 0, len(urlList))
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for _, url := range urlList {
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images = append(images, CommentImageResponse{URL: url})
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}
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}
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}
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return &CommentResponse{
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ID: comment.ID,
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PostID: comment.PostID,
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UserID: comment.UserID,
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ParentID: comment.ParentID,
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RootID: comment.RootID,
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Content: comment.Content,
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Images: images,
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LikesCount: comment.LikesCount,
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RepliesCount: comment.RepliesCount,
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CreatedAt: FormatTime(comment.CreatedAt),
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Author: author,
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IsLiked: isLiked,
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TargetID: targetID,
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Replies: replies,
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}
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}
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// ConvertCommentsToResponseWithUser 将Comment列表转换为响应列表（根据用户ID检查点赞状态）
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func ConvertCommentsToResponseWithUser(comments []*model.Comment, userID string, checker IsLikedChecker) []*CommentResponse {
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result := make([]*CommentResponse, 0, len(comments))
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for _, comment := range comments {
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result = append(result, ConvertCommentToResponseWithUser(comment, userID, checker))
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}
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return result
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}
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