866 lines
27 KiB
Go
866 lines
27 KiB
Go
package handler
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import (
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"context"
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"encoding/json"
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"net/http"
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"sort"
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"strconv"
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"strings"
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"sync"
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"time"
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"unicode/utf8"
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"soul-api/internal/cache"
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"soul-api/internal/database"
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"soul-api/internal/model"
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"github.com/gin-gonic/gin"
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"gorm.io/gorm"
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)
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// excludeParts 排除序言、尾声、附录（不参与精选推荐/热门排序）
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var excludeParts = []string{"序言", "尾声", "附录"}
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// sortChaptersByNaturalID 同 sort_order 时按 id 自然排序（9.1 < 9.2 < 9.10），调用 db_book 的 naturalLessSectionID
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func sortChaptersByNaturalID(list []model.Chapter) {
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sort.Slice(list, func(i, j int) bool {
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soI, soJ := 999999, 999999
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if list[i].SortOrder != nil {
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soI = *list[i].SortOrder
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}
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if list[j].SortOrder != nil {
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soJ = *list[j].SortOrder
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}
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if soI != soJ {
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return soI < soJ
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}
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return naturalLessSectionID(list[i].ID, list[j].ID)
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})
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}
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// allChaptersSelectCols 列表不加载 content（longtext），避免 502 超时
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var allChaptersSelectCols = []string{
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"mid", "id", "part_id", "part_title", "chapter_id", "chapter_title",
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"section_title", "word_count", "is_free", "price", "sort_order", "status",
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"is_new", "edition_standard", "edition_premium", "hot_score", "created_at", "updated_at",
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}
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// chapterMetaCols 章节详情元数据（不含 content），用于 content 缓存命中时的轻量查询
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var chapterMetaCols = []string{
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"mid", "id", "part_id", "part_title", "chapter_id", "chapter_title",
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"section_title", "word_count", "is_free", "price", "sort_order", "status",
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"is_new", "edition_standard", "edition_premium", "hot_score", "created_at", "updated_at",
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}
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// allChaptersCache 内存缓存，减轻 DB 压力，30 秒 TTL
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var allChaptersCache struct {
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mu sync.RWMutex
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data []model.Chapter
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expires time.Time
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key string // excludeFixed 不同则 key 不同
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}
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const allChaptersCacheTTL = 30 * time.Second
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// bookPartsCache 目录接口内存缓存，30 秒 TTL，减轻 DB 压力
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type cachedPartRow struct {
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PartID string `json:"id"`
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PartTitle string `json:"title"`
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Subtitle string `json:"subtitle"`
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ChapterCount int `json:"chapterCount"`
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MinSortOrder int `json:"minSortOrder"`
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}
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type cachedFixedItem struct {
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ID string `json:"id"`
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MID int `json:"mid"`
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SectionTitle string `json:"title"`
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}
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// bookPartsRedisPayload Redis 缓存结构，与 BookParts 响应一致
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type bookPartsRedisPayload struct {
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Parts []cachedPartRow `json:"parts"`
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TotalSections int64 `json:"totalSections"`
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FixedSections []cachedFixedItem `json:"fixedSections"`
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}
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var bookPartsCache struct {
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mu sync.RWMutex
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parts []cachedPartRow
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total int64
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fixed []cachedFixedItem
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expires time.Time
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}
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const bookPartsCacheTTL = 30 * time.Second
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// WarmAllChaptersCache 启动时预热缓存，避免首请求冷启动 502
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func WarmAllChaptersCache() {
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db := database.DB()
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q := db.Model(&model.Chapter{}).Select(allChaptersSelectCols)
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var list []model.Chapter
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if err := q.Order("COALESCE(sort_order, 999999) ASC, id ASC").Find(&list).Error; err != nil {
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return
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}
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sortChaptersByNaturalID(list)
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freeIDs := getFreeChapterIDs(db)
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for i := range list {
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if freeIDs[list[i].ID] {
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t := true
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z := float64(0)
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list[i].IsFree = &t
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list[i].Price = &z
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}
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}
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allChaptersCache.mu.Lock()
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allChaptersCache.data = list
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allChaptersCache.expires = time.Now().Add(allChaptersCacheTTL)
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allChaptersCache.key = "default"
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allChaptersCache.mu.Unlock()
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}
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// fetchAndCacheBookParts 执行 DB 查询并更新缓存，供 BookParts 与 WarmBookPartsCache 复用
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func fetchAndCacheBookParts() (parts []cachedPartRow, total int64, fixed []cachedFixedItem) {
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db := database.DB()
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var wg sync.WaitGroup
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wg.Add(3)
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go func() {
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defer wg.Done()
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conds := make([]string, len(excludeParts))
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args := make([]interface{}, len(excludeParts))
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for i, p := range excludeParts {
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conds[i] = "part_title LIKE ?"
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args[i] = "%" + p + "%"
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}
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where := "(" + strings.Join(conds, " OR ") + ")"
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var rows []model.Chapter
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if err := db.Model(&model.Chapter{}).Select("id", "mid", "section_title", "sort_order").
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Where(where, args...).
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Order("COALESCE(sort_order, 999999) ASC, id ASC").
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Find(&rows).Error; err == nil {
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sortChaptersByNaturalID(rows)
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for _, r := range rows {
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fixed = append(fixed, cachedFixedItem{r.ID, r.MID, r.SectionTitle})
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}
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}
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}()
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where := "1=1"
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args := []interface{}{}
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for _, p := range excludeParts {
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where += " AND part_title NOT LIKE ?"
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args = append(args, "%"+p+"%")
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}
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sql := `SELECT part_id, part_title, '' as subtitle,
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COUNT(DISTINCT chapter_id) as chapter_count,
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MIN(COALESCE(sort_order, 999999)) as min_sort
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FROM chapters WHERE ` + where + `
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GROUP BY part_id, part_title ORDER BY min_sort ASC, part_id ASC`
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var raw []struct {
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PartID string `gorm:"column:part_id"`
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PartTitle string `gorm:"column:part_title"`
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Subtitle string `gorm:"column:subtitle"`
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ChapterCount int `gorm:"column:chapter_count"`
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MinSortOrder int `gorm:"column:min_sort"`
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}
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go func() {
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defer wg.Done()
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db.Raw(sql, args...).Scan(&raw)
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}()
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go func() {
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defer wg.Done()
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db.Model(&model.Chapter{}).Count(&total)
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}()
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wg.Wait()
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parts = make([]cachedPartRow, len(raw))
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for i, r := range raw {
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parts[i] = cachedPartRow{
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PartID: r.PartID, PartTitle: r.PartTitle, Subtitle: r.Subtitle,
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ChapterCount: r.ChapterCount, MinSortOrder: r.MinSortOrder,
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}
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}
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bookPartsCache.mu.Lock()
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bookPartsCache.parts = parts
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bookPartsCache.total = total
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bookPartsCache.fixed = fixed
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bookPartsCache.expires = time.Now().Add(bookPartsCacheTTL)
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bookPartsCache.mu.Unlock()
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return parts, total, fixed
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}
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// WarmBookPartsCache 启动时预热目录缓存（内存+Redis），避免首请求慢
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func WarmBookPartsCache() {
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parts, total, fixed := fetchAndCacheBookParts()
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payload := bookPartsRedisPayload{Parts: parts, TotalSections: total, FixedSections: fixed}
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cache.Set(context.Background(), cache.KeyBookParts, payload, cache.BookPartsTTL)
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}
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// BookAllChapters GET /api/book/all-chapters 返回所有章节（列表，来自 chapters 表）
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// 排序须与管理端 PUT /api/db/book action=reorder 一致：按 sort_order 升序，同序按 id
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// 免费判断：system_config.free_chapters / chapter_config.freeChapters 优先于 chapters.is_free
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// 支持 excludeFixed=1：排除序言、尾声、附录（目录页固定模块，不参与中间篇章）
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// 带 30 秒内存缓存，管理端更新后最多 30 秒生效
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func BookAllChapters(c *gin.Context) {
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cacheKey := "default"
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if c.Query("excludeFixed") == "1" {
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cacheKey = "excludeFixed"
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}
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allChaptersCache.mu.RLock()
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if allChaptersCache.key == cacheKey && time.Now().Before(allChaptersCache.expires) && len(allChaptersCache.data) > 0 {
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data := allChaptersCache.data
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allChaptersCache.mu.RUnlock()
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c.JSON(http.StatusOK, gin.H{"success": true, "data": data})
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return
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}
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allChaptersCache.mu.RUnlock()
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db := database.DB()
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q := db.Model(&model.Chapter{}).Select(allChaptersSelectCols)
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if cacheKey == "excludeFixed" {
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for _, p := range excludeParts {
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q = q.Where("part_title NOT LIKE ?", "%"+p+"%")
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}
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}
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var list []model.Chapter
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if err := q.Order("COALESCE(sort_order, 999999) ASC, id ASC").Find(&list).Error; err != nil {
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c.JSON(http.StatusOK, gin.H{"success": true, "data": []interface{}{}})
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return
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}
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sortChaptersByNaturalID(list)
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freeIDs := getFreeChapterIDs(db)
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for i := range list {
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if freeIDs[list[i].ID] {
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t := true
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z := float64(0)
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list[i].IsFree = &t
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list[i].Price = &z
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}
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}
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allChaptersCache.mu.Lock()
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allChaptersCache.data = list
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allChaptersCache.expires = time.Now().Add(allChaptersCacheTTL)
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allChaptersCache.key = cacheKey
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allChaptersCache.mu.Unlock()
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c.JSON(http.StatusOK, gin.H{"success": true, "data": list})
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}
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// BookChapterByID GET /api/book/chapter/:id 按业务 id 查询（兼容旧链接）
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func BookChapterByID(c *gin.Context) {
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id := c.Param("id")
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if id == "" {
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c.JSON(http.StatusBadRequest, gin.H{"success": false, "error": "缺少 id"})
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return
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}
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findChapterAndRespond(c, func(db *gorm.DB) *gorm.DB {
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return db.Where("id = ?", id)
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})
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}
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// BookParts GET /api/miniprogram/book/parts 目录懒加载：仅返回篇章列表，不含章节详情
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// 返回 parts（排除序言/尾声/附录）、totalSections、fixedSections（id, mid, title 供序言/尾声/附录跳转用 mid）
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// 缓存优先级：Redis（10min，后台更新时失效）> 内存（30s）> DB；Redis 不可用时回退内存+DB
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func BookParts(c *gin.Context) {
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// 1. 优先 Redis（后台无更新时长期有效）
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var redisPayload bookPartsRedisPayload
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if cache.Get(context.Background(), cache.KeyBookParts, &redisPayload) && len(redisPayload.Parts) > 0 {
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c.JSON(http.StatusOK, gin.H{
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"success": true,
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"parts": redisPayload.Parts,
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"totalSections": redisPayload.TotalSections,
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"fixedSections": redisPayload.FixedSections,
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})
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return
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}
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// 2. 内存缓存（30s，Redis 不可用时的容灾）
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bookPartsCache.mu.RLock()
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if time.Now().Before(bookPartsCache.expires) {
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parts := bookPartsCache.parts
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total := bookPartsCache.total
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fixed := bookPartsCache.fixed
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bookPartsCache.mu.RUnlock()
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c.JSON(http.StatusOK, gin.H{
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"success": true,
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"parts": parts,
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"totalSections": total,
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"fixedSections": fixed,
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})
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return
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}
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bookPartsCache.mu.RUnlock()
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// 3. DB 查询并更新 Redis + 内存
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parts, total, fixed := fetchAndCacheBookParts()
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payload := bookPartsRedisPayload{Parts: parts, TotalSections: total, FixedSections: fixed}
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cache.Set(context.Background(), cache.KeyBookParts, payload, cache.BookPartsTTL)
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c.JSON(http.StatusOK, gin.H{
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"success": true,
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"parts": parts,
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"totalSections": total,
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"fixedSections": fixed,
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})
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}
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// BookChaptersByPart GET /api/miniprogram/book/chapters-by-part?partId=xxx 按篇章返回章节列表（含 mid，供阅读页 by-mid 请求）
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func BookChaptersByPart(c *gin.Context) {
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partId := c.Query("partId")
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if partId == "" {
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c.JSON(http.StatusBadRequest, gin.H{"success": false, "error": "缺少 partId"})
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return
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}
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db := database.DB()
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var list []model.Chapter
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if err := db.Model(&model.Chapter{}).Select(allChaptersSelectCols).
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Where("part_id = ?", partId).
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Order("COALESCE(sort_order, 999999) ASC, id ASC").
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Find(&list).Error; err != nil {
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c.JSON(http.StatusOK, gin.H{"success": true, "data": []interface{}{}})
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return
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}
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sortChaptersByNaturalID(list)
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freeIDs := getFreeChapterIDs(db)
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for i := range list {
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if freeIDs[list[i].ID] {
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t := true
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z := float64(0)
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list[i].IsFree = &t
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list[i].Price = &z
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}
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}
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c.JSON(http.StatusOK, gin.H{"success": true, "data": list})
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}
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// BookChapterByMID GET /api/book/chapter/by-mid/:mid 按自增主键 mid 查询（新链接推荐）
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func BookChapterByMID(c *gin.Context) {
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midStr := c.Param("mid")
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if midStr == "" {
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c.JSON(http.StatusBadRequest, gin.H{"success": false, "error": "缺少 mid"})
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return
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}
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mid, err := strconv.Atoi(midStr)
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if err != nil || mid < 1 {
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c.JSON(http.StatusBadRequest, gin.H{"success": false, "error": "mid 必须为正整数"})
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return
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}
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findChapterAndRespond(c, func(db *gorm.DB) *gorm.DB {
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return db.Where("mid = ?", mid)
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})
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}
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// getFreeChapterIDs 从 system_config 读取免费章节 ID 列表（free_chapters 或 chapter_config.freeChapters）
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func getFreeChapterIDs(db *gorm.DB) map[string]bool {
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ids := make(map[string]bool)
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for _, key := range []string{"free_chapters", "chapter_config"} {
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var row model.SystemConfig
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if err := db.Where("config_key = ?", key).First(&row).Error; err != nil {
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continue
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}
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var val interface{}
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if err := json.Unmarshal(row.ConfigValue, &val); err != nil {
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continue
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}
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if key == "free_chapters" {
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if arr, ok := val.([]interface{}); ok {
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for _, v := range arr {
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if s, ok := v.(string); ok {
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ids[s] = true
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}
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}
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}
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} else if key == "chapter_config" {
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if m, ok := val.(map[string]interface{}); ok {
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if arr, ok := m["freeChapters"].([]interface{}); ok {
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for _, v := range arr {
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if s, ok := v.(string); ok {
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ids[s] = true
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}
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}
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}
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}
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}
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}
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return ids
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}
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// checkUserChapterAccess 判断 userId 是否有权读取 chapterID（VIP / 全书购买 / 单章购买）
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// isPremium=true 表示增值版，fullbook 买断不含增值版
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func checkUserChapterAccess(db *gorm.DB, userID, chapterID string, isPremium bool) bool {
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if userID == "" {
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return false
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}
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// VIP：is_vip=1 且未过期
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var u model.User
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if err := db.Select("id", "is_vip", "vip_expire_date", "has_full_book").Where("id = ?", userID).First(&u).Error; err != nil {
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return false
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}
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if u.IsVip != nil && *u.IsVip && u.VipExpireDate != nil && u.VipExpireDate.After(time.Now()) {
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return true
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}
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// 全书买断（不含增值版）
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if !isPremium && u.HasFullBook != nil && *u.HasFullBook {
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return true
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}
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// 全书订单（兜底）
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if !isPremium {
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var cnt int64
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db.Model(&model.Order{}).Where("user_id = ? AND product_type = 'fullbook' AND status = 'paid'", userID).Count(&cnt)
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if cnt > 0 {
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return true
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}
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}
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// 单章购买
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var cnt int64
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db.Model(&model.Order{}).Where(
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"user_id = ? AND product_type = 'section' AND product_id = ? AND status = 'paid'",
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userID, chapterID,
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).Count(&cnt)
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return cnt > 0
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}
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// getUnpaidPreviewPercent 从 system_config 读取 unpaid_preview_percent，默认 20
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func getUnpaidPreviewPercent(db *gorm.DB) int {
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var row model.SystemConfig
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if err := db.Where("config_key = ?", "unpaid_preview_percent").First(&row).Error; err != nil || len(row.ConfigValue) == 0 {
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return 20
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}
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var val interface{}
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if err := json.Unmarshal(row.ConfigValue, &val); err != nil {
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return 20
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}
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switch v := val.(type) {
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case float64:
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p := int(v)
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if p < 1 {
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p = 1
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}
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if p > 100 {
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p = 100
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}
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return p
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case int:
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if v < 1 {
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return 1
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}
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if v > 100 {
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return 100
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}
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return v
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}
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return 20
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}
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|
||
// previewContent 取内容的前 percent%（不少于 100 字，上限 500 字），并追加省略提示
|
||
func previewContent(content string, percent int) string {
|
||
total := utf8.RuneCountInString(content)
|
||
if total == 0 {
|
||
return ""
|
||
}
|
||
if percent < 1 {
|
||
percent = 1
|
||
}
|
||
if percent > 100 {
|
||
percent = 100
|
||
}
|
||
limit := total * percent / 100
|
||
if limit < 100 {
|
||
limit = 100
|
||
}
|
||
const maxPreview = 500
|
||
if limit > maxPreview {
|
||
limit = maxPreview
|
||
}
|
||
if limit > total {
|
||
limit = total
|
||
}
|
||
runes := []rune(content)
|
||
return string(runes[:limit]) + "\n\n……（购买后阅读完整内容）"
|
||
}
|
||
|
||
// findChapterAndRespond 按条件查章节并返回统一格式
|
||
// 免费判断优先级：system_config.free_chapters / chapter_config.freeChapters > chapters.is_free/price
|
||
// 付费章节：若请求携带 userId 且有购买权限则返回完整 content，否则返回 previewContent
|
||
// content 缓存：优先 Redis，命中时仅查元数据（不含 LONGTEXT），未命中时查全量并回填缓存
|
||
func findChapterAndRespond(c *gin.Context, whereFn func(*gorm.DB) *gorm.DB) {
|
||
var ch model.Chapter
|
||
db := database.DB()
|
||
// 1. 先查元数据（不含 content，轻量）
|
||
if err := whereFn(db).Select(chapterMetaCols).First(&ch).Error; err != nil {
|
||
if err == gorm.ErrRecordNotFound {
|
||
c.JSON(http.StatusNotFound, gin.H{"success": false, "error": "章节不存在"})
|
||
return
|
||
}
|
||
c.JSON(http.StatusOK, gin.H{"success": false, "error": err.Error()})
|
||
return
|
||
}
|
||
|
||
// 2. 取 content：优先 Redis，未命中再查 DB
|
||
if content, ok := cache.GetString(context.Background(), cache.KeyChapterContent(ch.MID)); ok && content != "" {
|
||
ch.Content = content
|
||
} else {
|
||
if err := db.Model(&model.Chapter{}).Where("mid = ?", ch.MID).Pluck("content", &ch.Content).Error; err != nil {
|
||
c.JSON(http.StatusOK, gin.H{"success": false, "error": err.Error()})
|
||
return
|
||
}
|
||
cache.SetString(context.Background(), cache.KeyChapterContent(ch.MID), ch.Content, cache.ChapterContentTTL)
|
||
}
|
||
|
||
isFreeFromConfig := getFreeChapterIDs(db)[ch.ID]
|
||
isFree := isFreeFromConfig
|
||
if !isFree && ch.IsFree != nil && *ch.IsFree {
|
||
isFree = true
|
||
}
|
||
if !isFree && ch.Price != nil && *ch.Price == 0 {
|
||
isFree = true
|
||
}
|
||
|
||
// 确定返回的 content：免费直接返回，付费须校验购买权限
|
||
userID := c.Query("userId")
|
||
isPremium := ch.EditionPremium != nil && *ch.EditionPremium
|
||
var returnContent string
|
||
if isFree {
|
||
returnContent = ch.Content
|
||
} else if checkUserChapterAccess(db, userID, ch.ID, isPremium) {
|
||
returnContent = ch.Content
|
||
} else {
|
||
percent := getUnpaidPreviewPercent(db)
|
||
returnContent = previewContent(ch.Content, percent)
|
||
}
|
||
|
||
// data 中的 content 必须与外层 content 一致，避免泄露完整内容给未授权用户
|
||
chForResponse := ch
|
||
chForResponse.Content = returnContent
|
||
|
||
out := gin.H{
|
||
"success": true,
|
||
"data": chForResponse,
|
||
"content": returnContent,
|
||
"chapterTitle": ch.ChapterTitle,
|
||
"partTitle": ch.PartTitle,
|
||
"id": ch.ID,
|
||
"mid": ch.MID,
|
||
"sectionTitle": ch.SectionTitle,
|
||
"isFree": isFree,
|
||
}
|
||
if isFreeFromConfig {
|
||
out["price"] = float64(0)
|
||
} else if ch.Price != nil {
|
||
out["price"] = *ch.Price
|
||
}
|
||
c.JSON(http.StatusOK, out)
|
||
}
|
||
|
||
// BookChapters GET/POST/PUT/DELETE /api/book/chapters（与 app/api/book/chapters 一致，用 GORM）
|
||
func BookChapters(c *gin.Context) {
|
||
db := database.DB()
|
||
switch c.Request.Method {
|
||
case http.MethodGet:
|
||
partId := c.Query("partId")
|
||
status := c.Query("status")
|
||
if status == "" {
|
||
status = "published"
|
||
}
|
||
page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
|
||
pageSize, _ := strconv.Atoi(c.DefaultQuery("pageSize", "100"))
|
||
if page < 1 {
|
||
page = 1
|
||
}
|
||
if pageSize < 1 || pageSize > 500 {
|
||
pageSize = 100
|
||
}
|
||
q := db.Model(&model.Chapter{})
|
||
if partId != "" {
|
||
q = q.Where("part_id = ?", partId)
|
||
}
|
||
if status != "" && status != "all" {
|
||
q = q.Where("status = ?", status)
|
||
}
|
||
var total int64
|
||
q.Count(&total)
|
||
var list []model.Chapter
|
||
q.Order("sort_order ASC, id ASC").Offset((page - 1) * pageSize).Limit(pageSize).Find(&list)
|
||
totalPages := int(total) / pageSize
|
||
if int(total)%pageSize > 0 {
|
||
totalPages++
|
||
}
|
||
c.JSON(http.StatusOK, gin.H{
|
||
"success": true,
|
||
"data": gin.H{
|
||
"list": list, "total": total, "page": page, "pageSize": pageSize, "totalPages": totalPages,
|
||
},
|
||
})
|
||
return
|
||
case http.MethodPost:
|
||
var body model.Chapter
|
||
if err := c.ShouldBindJSON(&body); err != nil {
|
||
c.JSON(http.StatusBadRequest, gin.H{"success": false, "error": "请求体无效"})
|
||
return
|
||
}
|
||
if body.ID == "" || body.PartID == "" || body.ChapterID == "" {
|
||
c.JSON(http.StatusBadRequest, gin.H{"success": false, "error": "缺少必要字段 id/partId/chapterId"})
|
||
return
|
||
}
|
||
if err := db.Create(&body).Error; err != nil {
|
||
c.JSON(http.StatusOK, gin.H{"success": false, "error": err.Error()})
|
||
return
|
||
}
|
||
c.JSON(http.StatusOK, gin.H{"success": true, "data": body})
|
||
return
|
||
case http.MethodPut:
|
||
var body model.Chapter
|
||
if err := c.ShouldBindJSON(&body); err != nil || body.ID == "" {
|
||
c.JSON(http.StatusBadRequest, gin.H{"success": false, "error": "缺少 id"})
|
||
return
|
||
}
|
||
updates := map[string]interface{}{
|
||
"part_title": body.PartTitle, "chapter_title": body.ChapterTitle, "section_title": body.SectionTitle,
|
||
"content": body.Content, "word_count": body.WordCount, "is_free": body.IsFree, "price": body.Price,
|
||
"sort_order": body.SortOrder, "status": body.Status,
|
||
}
|
||
if body.EditionStandard != nil {
|
||
updates["edition_standard"] = body.EditionStandard
|
||
}
|
||
if body.EditionPremium != nil {
|
||
updates["edition_premium"] = body.EditionPremium
|
||
}
|
||
if err := db.Model(&model.Chapter{}).Where("id = ?", body.ID).Updates(updates).Error; err != nil {
|
||
c.JSON(http.StatusOK, gin.H{"success": false, "error": err.Error()})
|
||
return
|
||
}
|
||
c.JSON(http.StatusOK, gin.H{"success": true})
|
||
return
|
||
case http.MethodDelete:
|
||
id := c.Query("id")
|
||
if id == "" {
|
||
c.JSON(http.StatusBadRequest, gin.H{"success": false, "error": "缺少 id"})
|
||
return
|
||
}
|
||
if err := db.Where("id = ?", id).Delete(&model.Chapter{}).Error; err != nil {
|
||
c.JSON(http.StatusOK, gin.H{"success": false, "error": err.Error()})
|
||
return
|
||
}
|
||
c.JSON(http.StatusOK, gin.H{"success": true})
|
||
return
|
||
}
|
||
c.JSON(http.StatusOK, gin.H{"success": false, "error": "不支持的请求方法"})
|
||
}
|
||
|
||
// bookHotChaptersSorted 按精选推荐算法排序：阅读量优先，同量按更新时间；排除序言/尾声/附录
|
||
func bookHotChaptersSorted(db *gorm.DB, limit int) []model.Chapter {
|
||
q := db.Model(&model.Chapter{})
|
||
for _, p := range excludeParts {
|
||
q = q.Where("part_title NOT LIKE ?", "%"+p+"%")
|
||
}
|
||
var all []model.Chapter
|
||
if err := q.Order("sort_order ASC, id ASC").Find(&all).Error; err != nil || len(all) == 0 {
|
||
return nil
|
||
}
|
||
sortChaptersByNaturalID(all)
|
||
// 从 reading_progress 统计阅读量
|
||
ids := make([]string, 0, len(all))
|
||
for _, c := range all {
|
||
ids = append(ids, c.ID)
|
||
}
|
||
var counts []struct {
|
||
SectionID string `gorm:"column:section_id"`
|
||
Cnt int64 `gorm:"column:cnt"`
|
||
}
|
||
db.Table("reading_progress").Select("section_id, COUNT(*) as cnt").
|
||
Where("section_id IN ?", ids).Group("section_id").Scan(&counts)
|
||
countMap := make(map[string]int64)
|
||
for _, r := range counts {
|
||
countMap[r.SectionID] = r.Cnt
|
||
}
|
||
// 按阅读量降序、同量按 updated_at 降序
|
||
type withSort struct {
|
||
ch model.Chapter
|
||
cnt int64
|
||
}
|
||
withCnt := make([]withSort, 0, len(all))
|
||
for _, c := range all {
|
||
withCnt = append(withCnt, withSort{ch: c, cnt: countMap[c.ID]})
|
||
}
|
||
for i := 0; i < len(withCnt)-1; i++ {
|
||
for j := i + 1; j < len(withCnt); j++ {
|
||
if withCnt[j].cnt > withCnt[i].cnt ||
|
||
(withCnt[j].cnt == withCnt[i].cnt && withCnt[j].ch.UpdatedAt.After(withCnt[i].ch.UpdatedAt)) {
|
||
withCnt[i], withCnt[j] = withCnt[j], withCnt[i]
|
||
}
|
||
}
|
||
}
|
||
out := make([]model.Chapter, 0, limit)
|
||
for i := 0; i < limit && i < len(withCnt); i++ {
|
||
out = append(out, withCnt[i].ch)
|
||
}
|
||
return out
|
||
}
|
||
|
||
// BookHot GET /api/book/hot 热门章节（按阅读量排序，排除序言/尾声/附录；支持 ?limit=，最大 50）
|
||
// Redis 缓存 5min，章节更新时失效
|
||
func BookHot(c *gin.Context) {
|
||
limit := 10
|
||
if l := c.Query("limit"); l != "" {
|
||
if n, err := strconv.Atoi(l); err == nil && n > 0 && n <= 50 {
|
||
limit = n
|
||
}
|
||
}
|
||
// 优先 Redis
|
||
var cached []model.Chapter
|
||
if cache.Get(context.Background(), cache.KeyBookHot(limit), &cached) && len(cached) > 0 {
|
||
c.JSON(http.StatusOK, gin.H{"success": true, "data": cached})
|
||
return
|
||
}
|
||
list := bookHotChaptersSorted(database.DB(), limit)
|
||
if len(list) == 0 {
|
||
q := database.DB().Model(&model.Chapter{})
|
||
for _, p := range excludeParts {
|
||
q = q.Where("part_title NOT LIKE ?", "%"+p+"%")
|
||
}
|
||
q.Order("sort_order ASC, id ASC").Limit(10).Find(&list)
|
||
sortChaptersByNaturalID(list)
|
||
}
|
||
cache.Set(context.Background(), cache.KeyBookHot(limit), list, cache.BookRelatedTTL)
|
||
c.JSON(http.StatusOK, gin.H{"success": true, "data": list})
|
||
}
|
||
|
||
// BookRecommended GET /api/book/recommended 精选推荐（首页「为你推荐」前 3 章）
|
||
// Redis 缓存 5min，章节更新时失效
|
||
func BookRecommended(c *gin.Context) {
|
||
var cached []gin.H
|
||
if cache.Get(context.Background(), cache.KeyBookRecommended, &cached) && len(cached) > 0 {
|
||
c.JSON(http.StatusOK, gin.H{"success": true, "data": cached})
|
||
return
|
||
}
|
||
sections, err := computeArticleRankingSections(database.DB())
|
||
if err != nil || len(sections) == 0 {
|
||
c.JSON(http.StatusOK, gin.H{"success": true, "data": []gin.H{}})
|
||
return
|
||
}
|
||
limit := 3
|
||
if len(sections) < limit {
|
||
limit = len(sections)
|
||
}
|
||
tags := []string{"热门", "推荐", "精选"}
|
||
out := make([]gin.H, 0, limit)
|
||
for i := 0; i < limit; i++ {
|
||
s := sections[i]
|
||
tag := "精选"
|
||
if i < len(tags) {
|
||
tag = tags[i]
|
||
}
|
||
out = append(out, gin.H{
|
||
"id": s.ID,
|
||
"mid": s.MID,
|
||
"sectionTitle": s.Title,
|
||
"partTitle": s.PartTitle,
|
||
"chapterTitle": s.ChapterTitle,
|
||
"tag": tag,
|
||
"isFree": s.IsFree,
|
||
"price": s.Price,
|
||
"isNew": s.IsNew,
|
||
})
|
||
}
|
||
cache.Set(context.Background(), cache.KeyBookRecommended, out, cache.BookRelatedTTL)
|
||
c.JSON(http.StatusOK, gin.H{"success": true, "data": out})
|
||
}
|
||
|
||
// BookLatestChapters GET /api/book/latest-chapters 最新更新（按 updated_at 降序，排除序言/尾声/附录）
|
||
func BookLatestChapters(c *gin.Context) {
|
||
db := database.DB()
|
||
q := db.Model(&model.Chapter{}).Select(allChaptersSelectCols)
|
||
for _, p := range excludeParts {
|
||
q = q.Where("part_title NOT LIKE ?", "%"+p+"%")
|
||
}
|
||
var list []model.Chapter
|
||
if err := q.Order("updated_at DESC, id ASC").Limit(20).Find(&list).Error; err != nil {
|
||
c.JSON(http.StatusOK, gin.H{"success": true, "data": []interface{}{}})
|
||
return
|
||
}
|
||
sort.Slice(list, func(i, j int) bool {
|
||
if !list[i].UpdatedAt.Equal(list[j].UpdatedAt) {
|
||
return list[i].UpdatedAt.After(list[j].UpdatedAt)
|
||
}
|
||
return naturalLessSectionID(list[i].ID, list[j].ID)
|
||
})
|
||
freeIDs := getFreeChapterIDs(db)
|
||
for i := range list {
|
||
if freeIDs[list[i].ID] {
|
||
t := true
|
||
z := float64(0)
|
||
list[i].IsFree = &t
|
||
list[i].Price = &z
|
||
}
|
||
}
|
||
c.JSON(http.StatusOK, gin.H{"success": true, "data": list})
|
||
}
|
||
|
||
func escapeLikeBook(s string) string {
|
||
s = strings.ReplaceAll(s, "\\", "\\\\")
|
||
s = strings.ReplaceAll(s, "%", "\\%")
|
||
s = strings.ReplaceAll(s, "_", "\\_")
|
||
return s
|
||
}
|
||
|
||
// BookSearch GET /api/book/search?q= 章节搜索（与 /api/search 逻辑一致）
|
||
func BookSearch(c *gin.Context) {
|
||
q := strings.TrimSpace(c.Query("q"))
|
||
if q == "" {
|
||
c.JSON(http.StatusOK, gin.H{"success": true, "results": []interface{}{}, "total": 0, "keyword": ""})
|
||
return
|
||
}
|
||
pattern := "%" + escapeLikeBook(q) + "%"
|
||
var list []model.Chapter
|
||
err := database.DB().Model(&model.Chapter{}).
|
||
Where("section_title LIKE ? OR content LIKE ?", pattern, pattern).
|
||
Order("sort_order ASC, id ASC").
|
||
Limit(20).
|
||
Find(&list).Error
|
||
if err != nil {
|
||
c.JSON(http.StatusOK, gin.H{"success": true, "results": []interface{}{}, "total": 0, "keyword": q})
|
||
return
|
||
}
|
||
sortChaptersByNaturalID(list)
|
||
lowerQ := strings.ToLower(q)
|
||
results := make([]gin.H, 0, len(list))
|
||
for _, ch := range list {
|
||
matchType := "content"
|
||
if strings.Contains(strings.ToLower(ch.SectionTitle), lowerQ) {
|
||
matchType = "title"
|
||
}
|
||
results = append(results, gin.H{
|
||
"id": ch.ID, "mid": ch.MID, "title": ch.SectionTitle, "part": ch.PartTitle, "chapter": ch.ChapterTitle,
|
||
"isFree": ch.IsFree, "matchType": matchType,
|
||
})
|
||
}
|
||
c.JSON(http.StatusOK, gin.H{"success": true, "results": results, "total": len(results), "keyword": q})
|
||
}
|
||
|
||
// BookStats GET /api/book/stats
|
||
// Redis 缓存 5min，章节更新时失效
|
||
func BookStats(c *gin.Context) {
|
||
var cached struct {
|
||
TotalChapters int64 `json:"totalChapters"`
|
||
}
|
||
if cache.Get(context.Background(), cache.KeyBookStats, &cached) {
|
||
c.JSON(http.StatusOK, gin.H{"success": true, "data": gin.H{"totalChapters": cached.TotalChapters}})
|
||
return
|
||
}
|
||
var total int64
|
||
database.DB().Model(&model.Chapter{}).Count(&total)
|
||
cache.Set(context.Background(), cache.KeyBookStats, gin.H{"totalChapters": total}, cache.BookRelatedTTL)
|
||
c.JSON(http.StatusOK, gin.H{"success": true, "data": gin.H{"totalChapters": total}})
|
||
}
|
||
|
||
// BookSync GET/POST /api/book/sync
|
||
func BookSync(c *gin.Context) {
|
||
c.JSON(http.StatusOK, gin.H{"success": true, "message": "同步由 DB 维护"})
|
||
}
|