mirror of
https://github.com/truewhile/MeBox.git
synced 2026-10-11 07:46:37 +08:00
truewhile
267 lines
11 KiB
Go
267 lines
11 KiB
Go
package database
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import (
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"gorm.io/gorm"
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"github.com/truewhile/MeBox/internal/model"
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)
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// AutoMigrate creates tables for every model registered in the model package.
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func AutoMigrate(db *gorm.DB) error {
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// 必须先于 AutoMigrate：旧库中可能已有重复的 (user_id, media_id) 历史行，
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// 不去重会导致唯一索引 uniq_user_history 创建失败。
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if err := dedupePlaybackHistories(db); err != nil {
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return err
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}
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// 书源从「全局唯一」改成「按用户独立」：先删掉 source_url 上的旧唯一索引。
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// AutoMigrate 只会按索引名创建新索引，不会删除已改名的旧唯一索引，留着它
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// 第二个用户导入同一书源就会撞唯一约束。
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if err := dropLegacyReaderSourceUniqueIndex(db); err != nil {
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return err
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}
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if err := db.AutoMigrate(model.AllModels()...); err != nil {
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return err
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}
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// 回填书源归属：老库的书源没有 user_id，按「谁书架上有这本书」分配或复制副本。
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if err := backfillReaderSourceOwnership(db); err != nil {
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return err
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}
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if err := ensurePostgresColumnCompatibility(db); err != nil {
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return err
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}
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if err := ensurePerformanceIndexes(db); err != nil {
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return err
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}
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if err := ensureLibraryRootsCompatibility(db); err != nil {
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return err
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}
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if err := ensureEmbyMountsCompatibility(db); err != nil {
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return err
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}
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if isSQLite(db) {
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if err := ensureMediaSearchIndex(db); err != nil {
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return err
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}
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return ensureSQLiteQueryOptimizer(db)
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}
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return nil
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}
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func ensureSQLiteQueryOptimizer(db *gorm.DB) error {
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// Refresh planner statistics so indexes on large media tables are used.
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return db.Exec("ANALYZE").Error
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}
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// dropLegacyReaderSourceUniqueIndex 删除书源表上旧版 source_url 唯一索引。
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//
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// 书源改为按用户独立后唯一键是 (user_id, source_url)；SQLite 的 RenameTable 与
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// AutoMigrate 都不会删除按旧名创建的索引（实测旧唯一索引在改名后依然生效），
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// 必须显式删除，否则第二个用户导入同一书源会撞唯一约束。
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func dropLegacyReaderSourceUniqueIndex(db *gorm.DB) error {
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if !db.Migrator().HasTable(&model.ReaderBookSource{}) {
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return nil
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}
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for _, name := range []string{"idx_reader_book_sources_source_url", "reader_book_sources_source_url_key"} {
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if db.Migrator().HasIndex(&model.ReaderBookSource{}, name) {
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if err := db.Migrator().DropIndex(&model.ReaderBookSource{}, name); err != nil {
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return err
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}
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}
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}
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// 旧版 DeleteSource 是软删：这些历史行会继续占用 (user_id, source_url) 唯一键，
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// 让「删掉再导入同一书源」失败。书源是可重新导入的数据，这里一次性清掉。
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return db.Unscoped().Where("deleted_at IS NOT NULL").Delete(&model.ReaderBookSource{}).Error
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}
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// backfillReaderSourceOwnership 给老库的书源补上归属用户。
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//
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// 书源原先全局唯一，现在按用户独立：按「谁的书架上有这本书」把书源分配给该用户；
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// 同一书源被多个用户引用时，给每个用户复制一份副本（各自启停/排序/改规则），
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// 这样谁都不会因为别人删源而失去书源。
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//
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// 没有 user_id 且无人引用的书源保持原样（user_id 为空）——它不再出现在任何人的
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// 列表里，但数据仍在，需要时可以人工认领。
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func backfillReaderSourceOwnership(db *gorm.DB) error {
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if !db.Migrator().HasTable(&model.ReaderBookSource{}) {
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return nil
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}
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var pending []model.ReaderBookSource
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if err := db.Where("user_id = '' OR user_id IS NULL").Find(&pending).Error; err != nil {
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return err
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}
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for i := range pending {
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src := pending[i]
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if err := assignOrCloneReaderSource(db, &src); err != nil {
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return err
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}
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}
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return nil
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}
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func assignOrCloneReaderSource(db *gorm.DB, src *model.ReaderBookSource) error {
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if src == nil || src.SourceURL == "" {
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return nil
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}
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// 引用该书源的书籍分布（去重到用户）。
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type ownerCount struct {
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UserID string
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N int64
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}
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var owners []ownerCount
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if err := db.Model(&model.ReaderBook{}).
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Select("user_id, COUNT(*) AS n").
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Where("origin = ?", src.SourceURL).
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Group("user_id").Order("n DESC").Scan(&owners).Error; err != nil {
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return err
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}
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if len(owners) == 0 {
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return nil // 无人引用：保持无归属
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}
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// 第一个用户（引用最多）直接接手这一行。
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owner := owners[0].UserID
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if owner == "" {
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return nil
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}
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if err := db.Model(&model.ReaderBookSource{}).
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Where("id = ?", src.ID).
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Updates(map[string]any{"user_id": owner}).Error; err != nil {
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return err
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}
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// 其余用户各复制一份副本（新行 ID，其余字段全量拷贝）。
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for _, o := range owners[1:] {
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if o.UserID == "" || o.UserID == owner {
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continue
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}
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var exists int64
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if err := db.Model(&model.ReaderBookSource{}).
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Where("user_id = ? AND source_url = ?", o.UserID, src.SourceURL).
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Count(&exists).Error; err != nil {
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return err
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}
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if exists > 0 {
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continue
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}
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clone := *src
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clone.ID = ""
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clone.UserID = o.UserID
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if err := db.Create(&clone).Error; err != nil {
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return err
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}
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}
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return nil
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}
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// dedupePlaybackHistories removes duplicate (user_id, media_id) rows left by
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// the former read-then-write upsert, so the uniq_user_history composite unique
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// index can be created on existing databases. Keeps the most recent row per
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// pair, preferring live rows over soft-deleted ones.
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func dedupePlaybackHistories(db *gorm.DB) error {
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if !db.Migrator().HasTable("playback_histories") {
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return nil
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}
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return db.Exec(`
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DELETE FROM playback_histories WHERE id IN (
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SELECT id FROM (
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SELECT id, ROW_NUMBER() OVER (
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PARTITION BY user_id, media_id
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ORDER BY deleted_at IS NULL DESC, watched_at DESC, id DESC
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) AS rn
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FROM playback_histories
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) ranked
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WHERE ranked.rn > 1
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)`).Error
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}
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func ensurePostgresColumnCompatibility(db *gorm.DB) error {
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if !isPostgres(db) {
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return nil
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}
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statements := []string{
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`ALTER TABLE media ALTER COLUMN container TYPE varchar(128)`,
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`ALTER TABLE media ALTER COLUMN genres TYPE text`,
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`ALTER TABLE media ALTER COLUMN series_id TYPE varchar(128)`,
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`ALTER TABLE media ALTER COLUMN duplicate_of TYPE varchar(128)`,
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`ALTER TABLE playback_histories ALTER COLUMN media_id TYPE varchar(128)`,
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`ALTER TABLE favorites ALTER COLUMN media_id TYPE varchar(128)`,
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`ALTER TABLE playlist_items ALTER COLUMN media_id TYPE varchar(128)`,
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}
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for _, stmt := range statements {
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if err := db.Exec(stmt).Error; err != nil {
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return err
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}
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}
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return nil
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}
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func ensurePerformanceIndexes(db *gorm.DB) error {
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statements := []string{
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// 完整多级排序索引：媒体库分页与首页预览的 ORDER BY
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// (release_date, year, updated_at, created_at, id) DESC 与索引列完全一致，
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// LIMIT 分页沿索引顺序直取，免去对整库行做临时 B-tree 排序。
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`CREATE INDEX IF NOT EXISTS idx_media_library_recent_active ON media(library_id, release_date DESC, year DESC, updated_at DESC, created_at DESC, id DESC) WHERE deleted_at IS NULL`,
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// 计数覆盖索引：首页 CountByLibraries 的 GROUP BY library_id + nsfw 谓词
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// 全部落在索引键/部分索引条件上，纯索引扫描即可完成，不回表。
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`CREATE INDEX IF NOT EXISTS idx_media_library_nsfw_active ON media(library_id, nsfw) WHERE deleted_at IS NULL`,
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// 旧的两键前缀索引被上面的完整排序索引完全覆盖，删除以降低写放大。
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`DROP INDEX IF EXISTS idx_media_library_release_active`,
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`CREATE INDEX IF NOT EXISTS idx_media_library_created_active ON media(library_id, created_at DESC) WHERE deleted_at IS NULL`,
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`CREATE INDEX IF NOT EXISTS idx_media_library_episode_active ON media(library_id, season_num, episode_num, created_at DESC) WHERE deleted_at IS NULL`,
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`CREATE INDEX IF NOT EXISTS idx_media_library_root_active ON media(library_id, library_root_id) WHERE deleted_at IS NULL`,
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`CREATE INDEX IF NOT EXISTS idx_media_series_active ON media(series_id, season_num, episode_num) WHERE deleted_at IS NULL`,
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`CREATE INDEX IF NOT EXISTS idx_media_library_series_active ON media(library_id, series_id, season_num, episode_num) WHERE deleted_at IS NULL`,
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`CREATE INDEX IF NOT EXISTS idx_media_library_tmdb_active ON media(library_id, tm_db_id) WHERE deleted_at IS NULL`,
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`CREATE INDEX IF NOT EXISTS idx_media_library_bangumi_active ON media(library_id, bangumi_id) WHERE deleted_at IS NULL`,
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`CREATE INDEX IF NOT EXISTS idx_media_library_douban_active ON media(library_id, douban_id) WHERE deleted_at IS NULL`,
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`CREATE INDEX IF NOT EXISTS idx_media_library_thetvdb_active ON media(library_id, thetvdb_id) WHERE deleted_at IS NULL`,
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`CREATE INDEX IF NOT EXISTS idx_favorites_user_media_active ON favorites(user_id, media_id) WHERE deleted_at IS NULL`,
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`CREATE INDEX IF NOT EXISTS idx_playback_histories_user_media_active ON playback_histories(user_id, media_id, watched_at DESC) WHERE deleted_at IS NULL`,
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`CREATE INDEX IF NOT EXISTS idx_playback_histories_resume_active ON playback_histories(user_id, completed, watched_at DESC) WHERE deleted_at IS NULL`,
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`CREATE INDEX IF NOT EXISTS idx_play_profiles_user_created_active ON play_profiles(user_id, created_at DESC) WHERE deleted_at IS NULL`,
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}
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if isSQLite(db) {
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statements = append(statements,
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`CREATE INDEX IF NOT EXISTS idx_media_title_active ON media(title COLLATE NOCASE) WHERE deleted_at IS NULL`,
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`CREATE INDEX IF NOT EXISTS idx_media_original_name_active ON media(original_name COLLATE NOCASE) WHERE deleted_at IS NULL`,
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)
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} else {
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statements = append(statements,
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`CREATE INDEX IF NOT EXISTS idx_media_title_active ON media(title) WHERE deleted_at IS NULL`,
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`CREATE INDEX IF NOT EXISTS idx_media_original_name_active ON media(original_name) WHERE deleted_at IS NULL`,
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)
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}
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for _, stmt := range statements {
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if err := db.Exec(stmt).Error; err != nil {
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return err
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}
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}
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return nil
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}
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func ensureEmbyMountsCompatibility(db *gorm.DB) error {
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if !db.Migrator().HasTable(&model.EmbyMount{}) {
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return nil
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}
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if !db.Migrator().HasColumn(&model.EmbyMount{}, "sort_order") {
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if err := db.Migrator().AddColumn(&model.EmbyMount{}, "sort_order"); err != nil {
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return err
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}
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}
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// 针对已有数据：只给 sort_order=0/NULL 的行按创建时间补号（从现有
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// 最大值之后递增），不能整表重排——此前无条件按 created_at 从 0 重新
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// 编号，会把用户自定义的顺序覆盖掉。
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var zeroCount int64
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if err := db.Model(&model.EmbyMount{}).Where("sort_order = 0 OR sort_order IS NULL").Count(&zeroCount).Error; err == nil && zeroCount > 0 {
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// max 只统计非 0 行：sort_order=0 与 NULL 同样视为“未分配”，
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// 全部为 0 时从 0 开始编号（与迁移前的初始化语义一致）。
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var maxOrder int
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_ = db.Raw("SELECT COALESCE(MAX(sort_order), -1) FROM emby_mounts WHERE sort_order > 0").Scan(&maxOrder).Error
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var mounts []model.EmbyMount
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if err := db.Where("sort_order = 0 OR sort_order IS NULL").Order("created_at asc, id asc").Find(&mounts).Error; err == nil {
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for i, m := range mounts {
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_ = db.Exec("UPDATE emby_mounts SET sort_order = ? WHERE id = ?", maxOrder+1+i, m.ID).Error
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}
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}
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}
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return nil
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}
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