457 lines
17 KiB
Go
457 lines
17 KiB
Go
package postgres
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import (
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"context"
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"fmt"
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"github.com/jackc/pgx/v5"
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"sort"
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"telesrv/internal/domain"
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"telesrv/internal/store/postgres/sqlcgen"
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)
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func (s *ChannelStore) DeleteChannelMessages(ctx context.Context, req domain.DeleteChannelMessagesRequest) (domain.DeleteChannelMessagesResult, error) {
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if req.UserID == 0 || req.ChannelID == 0 || len(req.IDs) == 0 {
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return domain.DeleteChannelMessagesResult{}, domain.ErrChannelInvalid
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}
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if len(req.IDs) > domain.MaxDeleteMessageIDs {
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return domain.DeleteChannelMessagesResult{}, domain.ErrChannelInvalid
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}
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if req.Date == 0 {
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req.Date = nowUnix()
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}
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beginner, ok := s.db.(txBeginner)
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if !ok {
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return domain.DeleteChannelMessagesResult{}, fmt.Errorf("delete channel messages: db does not support transactions")
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}
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tx, err := beginner.Begin(ctx)
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if err != nil {
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return domain.DeleteChannelMessagesResult{}, fmt.Errorf("begin delete channel messages: %w", err)
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}
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committed := false
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defer func() {
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if !committed {
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_ = tx.Rollback(ctx)
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}
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}()
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channel, member, err := s.getChannelForMember(ctx, tx, req.UserID, req.ChannelID)
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if err != nil {
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return domain.DeleteChannelMessagesResult{}, err
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}
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refs, err := s.discussionRefsForMessages(ctx, tx, channel.ID, req.IDs)
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if err != nil {
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return domain.DeleteChannelMessagesResult{}, err
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}
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deleted, event, channel, err := s.deleteChannelMessagesTx(ctx, tx, channel, member, req.IDs, req.UserID, req.Date)
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if err != nil {
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return domain.DeleteChannelMessagesResult{}, err
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}
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cascades, err := s.cascadeDeleteDiscussionRootsTx(ctx, tx, refs, deleted, req.UserID, req.Date)
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if err != nil {
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return domain.DeleteChannelMessagesResult{}, err
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}
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if err := tx.Commit(ctx); err != nil {
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return domain.DeleteChannelMessagesResult{}, fmt.Errorf("commit delete channel messages: %w", err)
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}
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committed = true
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recipients, _ := s.ListActiveChannelMemberIDs(ctx, req.UserID, req.ChannelID, 0)
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for i := range cascades {
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cascades[i].Recipients, _ = s.ListActiveChannelMemberIDs(ctx, 0, cascades[i].Channel.ID, 0)
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}
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return domain.DeleteChannelMessagesResult{Channel: channel, Event: event, DeletedIDs: deleted, Recipients: recipients, DiscussionDeletes: cascades}, nil
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}
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// discussionRefsForMessages 取待删消息携带的讨论组转发根引用。
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func (s *ChannelStore) discussionRefsForMessages(ctx context.Context, tx pgx.Tx, channelID int64, ids []int) (map[int]domain.ChannelDiscussionRef, error) {
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id32, _, err := validUniqueChannelMessageIDs(ids)
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if err != nil {
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return nil, err
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}
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rows, err := tx.Query(ctx, `
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SELECT id, discussion_channel_id, discussion_message_id
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FROM channel_messages
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WHERE channel_id = $1 AND id = ANY($2::int[]) AND NOT deleted
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AND discussion_channel_id <> 0 AND discussion_message_id <> 0`, channelID, id32)
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if err != nil {
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return nil, fmt.Errorf("list discussion refs for delete: %w", err)
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}
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defer rows.Close()
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out := make(map[int]domain.ChannelDiscussionRef)
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for rows.Next() {
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var id, msgID int
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var discussionChannelID int64
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if err := rows.Scan(&id, &discussionChannelID, &msgID); err != nil {
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return nil, err
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}
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out[id] = domain.ChannelDiscussionRef{ChannelID: discussionChannelID, MessageID: msgID}
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}
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return out, rows.Err()
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}
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// cascadeDeleteDiscussionRootsTx 随 broadcast post 删除其在 linked 讨论组的
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// 转发根（官方为服务端级联）；锁序固定 post channel → discussion channel，
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// 讨论组侧删根不反向级联，无交叉死锁路径。
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func (s *ChannelStore) cascadeDeleteDiscussionRootsTx(ctx context.Context, tx pgx.Tx, refs map[int]domain.ChannelDiscussionRef, deleted []int, actorUserID int64, date int) ([]domain.ChannelCascadeDelete, error) {
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if len(refs) == 0 || len(deleted) == 0 {
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return nil, nil
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}
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byChannel := make(map[int64][]int)
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for _, id := range deleted {
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ref, ok := refs[id]
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if !ok || ref.ChannelID == 0 || ref.MessageID == 0 {
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continue
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}
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byChannel[ref.ChannelID] = append(byChannel[ref.ChannelID], ref.MessageID)
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}
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if len(byChannel) == 0 {
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return nil, nil
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}
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channelIDs := make([]int64, 0, len(byChannel))
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for id := range byChannel {
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channelIDs = append(channelIDs, id)
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}
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sort.Slice(channelIDs, func(i, j int) bool { return channelIDs[i] < channelIDs[j] })
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out := make([]domain.ChannelCascadeDelete, 0, len(channelIDs))
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for _, discussionChannelID := range channelIDs {
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group, err := getChannelByID(ctx, tx, discussionChannelID)
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if err != nil || group.Deleted {
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continue
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}
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// 级联是服务端动作，按 creator 权限执行（频道 admin 未必是讨论组成员）。
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systemMember := domain.ChannelMember{ChannelID: discussionChannelID, UserID: actorUserID, Role: domain.ChannelRoleCreator, Status: domain.ChannelMemberActive}
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groupDeleted, groupEvent, group, err := s.deleteChannelMessagesTx(ctx, tx, group, systemMember, byChannel[discussionChannelID], actorUserID, date)
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if err != nil {
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return nil, fmt.Errorf("cascade delete discussion roots: %w", err)
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}
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if len(groupDeleted) == 0 {
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continue
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}
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out = append(out, domain.ChannelCascadeDelete{Channel: group, Event: groupEvent})
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}
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return out, nil
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}
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func (s *ChannelStore) DeleteChannelHistory(ctx context.Context, req domain.DeleteChannelHistoryRequest) (domain.DeleteChannelHistoryResult, error) {
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if req.UserID == 0 || req.ChannelID == 0 {
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return domain.DeleteChannelHistoryResult{}, domain.ErrChannelInvalid
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}
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if req.Date == 0 {
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req.Date = nowUnix()
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}
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beginner, ok := s.db.(txBeginner)
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if !ok {
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return domain.DeleteChannelHistoryResult{}, fmt.Errorf("delete channel history: db does not support transactions")
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}
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tx, err := beginner.Begin(ctx)
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if err != nil {
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return domain.DeleteChannelHistoryResult{}, fmt.Errorf("begin delete channel history: %w", err)
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}
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committed := false
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defer func() {
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if !committed {
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_ = tx.Rollback(ctx)
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}
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}()
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channel, member, err := s.getChannelForMember(ctx, tx, req.UserID, req.ChannelID)
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if err != nil {
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return domain.DeleteChannelHistoryResult{}, err
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}
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maxID := req.MaxID
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if maxID <= 0 || maxID > channel.TopMessageID {
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maxID = channel.TopMessageID
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}
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if !req.ForEveryone {
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appliedMinID := maxInt(member.AvailableMinID, maxID)
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topID, topDate, err := visibleChannelTopAfter(ctx, tx, req.ChannelID, appliedMinID, channel.Date)
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if err != nil {
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return domain.DeleteChannelHistoryResult{}, err
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}
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if _, err := tx.Exec(ctx, `
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UPDATE channel_members
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SET available_min_id = GREATEST(available_min_id, $3),
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read_inbox_max_id = GREATEST(read_inbox_max_id, $3),
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unread_mark = false,
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updated_at = now()
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WHERE channel_id = $1 AND user_id = $2`, req.ChannelID, req.UserID, appliedMinID); err != nil {
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return domain.DeleteChannelHistoryResult{}, fmt.Errorf("update channel local clear member: %w", err)
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}
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if err := deleteChannelUnreadMentionsUpToTx(ctx, tx, req.UserID, req.ChannelID, appliedMinID); err != nil {
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return domain.DeleteChannelHistoryResult{}, err
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}
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if err := refreshChannelUnreadReactionsCountTx(ctx, tx, req.UserID, req.ChannelID); err != nil {
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return domain.DeleteChannelHistoryResult{}, err
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}
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if _, err := tx.Exec(ctx, `
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INSERT INTO channel_dialogs (
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user_id, channel_id, top_message_id, top_message_date, read_inbox_max_id, read_outbox_max_id, unread_count, unread_mark
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) VALUES ($1,$2,$3,$4,$5,0,0,false)
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ON CONFLICT (user_id, channel_id) DO UPDATE SET
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top_message_id = EXCLUDED.top_message_id,
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top_message_date = EXCLUDED.top_message_date,
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read_inbox_max_id = GREATEST(channel_dialogs.read_inbox_max_id, EXCLUDED.read_inbox_max_id),
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unread_count = 0,
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unread_mark = false,
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updated_at = now()`, req.UserID, req.ChannelID, topID, topDate, appliedMinID); err != nil {
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return domain.DeleteChannelHistoryResult{}, fmt.Errorf("upsert channel local clear dialog: %w", err)
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}
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if err := tx.Commit(ctx); err != nil {
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return domain.DeleteChannelHistoryResult{}, fmt.Errorf("commit local clear channel history: %w", err)
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}
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committed = true
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return domain.DeleteChannelHistoryResult{Channel: channel, AvailableMinID: appliedMinID}, nil
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}
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if !canDeleteAnyChannelMessage(member) {
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return domain.DeleteChannelHistoryResult{}, domain.ErrChannelAdminRequired
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}
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// id=1 是建群服务消息，全员清空必须保留：它是清空后会话仅剩的
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// top message，没有它客户端会把 lastMessage 视为空并从聊天列表
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// 隐藏该会话（成员资格仍在，但会话条目对全员消失）。
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rows, err := tx.Query(ctx, `
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SELECT id
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FROM channel_messages
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WHERE channel_id = $1 AND id <= $2 AND id > 1 AND NOT deleted
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ORDER BY id DESC
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LIMIT $3`, req.ChannelID, maxID, domain.MaxDeleteHistoryBatch)
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if err != nil {
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return domain.DeleteChannelHistoryResult{}, fmt.Errorf("list channel history delete ids: %w", err)
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}
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ids := make([]int, 0, domain.MaxDeleteHistoryBatch)
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for rows.Next() {
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var id int
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if err := rows.Scan(&id); err != nil {
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rows.Close()
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return domain.DeleteChannelHistoryResult{}, err
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}
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ids = append(ids, id)
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}
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if err := rows.Err(); err != nil {
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rows.Close()
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return domain.DeleteChannelHistoryResult{}, err
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}
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rows.Close()
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deleted, event, channel, err := s.deleteChannelMessagesTx(ctx, tx, channel, member, ids, req.UserID, req.Date)
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if err != nil {
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return domain.DeleteChannelHistoryResult{}, err
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}
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if err := tx.Commit(ctx); err != nil {
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return domain.DeleteChannelHistoryResult{}, fmt.Errorf("commit delete channel history: %w", err)
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}
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committed = true
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recipients, _ := s.ListActiveChannelMemberIDs(ctx, req.UserID, req.ChannelID, 0)
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offset := 0
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if len(deleted) == domain.MaxDeleteHistoryBatch {
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offset = 1
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}
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return domain.DeleteChannelHistoryResult{Channel: channel, Event: event, DeletedIDs: deleted, Recipients: recipients, Offset: offset}, nil
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}
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func (s *ChannelStore) DeleteChannelParticipantHistory(ctx context.Context, req domain.DeleteChannelParticipantHistoryRequest) (domain.DeleteChannelHistoryResult, error) {
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if req.UserID == 0 || req.ChannelID == 0 || req.ParticipantUserID == 0 {
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return domain.DeleteChannelHistoryResult{}, domain.ErrChannelInvalid
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}
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if req.Date == 0 {
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req.Date = nowUnix()
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}
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beginner, ok := s.db.(txBeginner)
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if !ok {
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return domain.DeleteChannelHistoryResult{}, fmt.Errorf("delete participant channel history: db does not support transactions")
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}
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tx, err := beginner.Begin(ctx)
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if err != nil {
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return domain.DeleteChannelHistoryResult{}, fmt.Errorf("begin delete participant channel history: %w", err)
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}
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committed := false
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defer func() {
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if !committed {
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_ = tx.Rollback(ctx)
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}
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}()
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channel, member, err := s.getChannelForMember(ctx, tx, req.UserID, req.ChannelID)
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if err != nil {
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return domain.DeleteChannelHistoryResult{}, err
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}
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if !canDeleteAnyChannelMessage(member) {
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return domain.DeleteChannelHistoryResult{}, domain.ErrChannelAdminRequired
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}
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// 同全员清空：id=1 建群服务消息不随发送者（创建者）历史一起删除，
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// 否则会话会因 lastMessage 为空从全员聊天列表隐藏。
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rows, err := tx.Query(ctx, `
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SELECT id
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FROM channel_messages
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WHERE channel_id = $1 AND sender_user_id = $2 AND id > 1 AND NOT deleted
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ORDER BY id DESC
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LIMIT $3`, req.ChannelID, req.ParticipantUserID, domain.MaxDeleteHistoryBatch)
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if err != nil {
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return domain.DeleteChannelHistoryResult{}, fmt.Errorf("list participant channel history delete ids: %w", err)
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}
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ids := make([]int, 0, domain.MaxDeleteHistoryBatch)
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for rows.Next() {
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var id int
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if err := rows.Scan(&id); err != nil {
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rows.Close()
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return domain.DeleteChannelHistoryResult{}, err
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}
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ids = append(ids, id)
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}
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if err := rows.Err(); err != nil {
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rows.Close()
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return domain.DeleteChannelHistoryResult{}, err
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}
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rows.Close()
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deleted, event, channel, err := s.deleteChannelMessagesTx(ctx, tx, channel, member, ids, req.UserID, req.Date)
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if err != nil {
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return domain.DeleteChannelHistoryResult{}, err
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}
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if err := tx.Commit(ctx); err != nil {
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return domain.DeleteChannelHistoryResult{}, fmt.Errorf("commit delete participant channel history: %w", err)
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}
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committed = true
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recipients, _ := s.ListActiveChannelMemberIDs(ctx, req.UserID, req.ChannelID, 0)
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offset := 0
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if len(deleted) == domain.MaxDeleteHistoryBatch {
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offset = 1
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}
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return domain.DeleteChannelHistoryResult{Channel: channel, Event: event, DeletedIDs: deleted, Recipients: recipients, Offset: offset}, nil
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}
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func (s *ChannelStore) deleteChannelMessagesTx(ctx context.Context, tx pgx.Tx, channel domain.Channel, member domain.ChannelMember, ids []int, actorUserID int64, date int) ([]int, domain.ChannelUpdateEvent, domain.Channel, error) {
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if len(ids) == 0 {
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return nil, domain.ChannelUpdateEvent{}, channel, nil
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}
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id32, ordered, err := validUniqueChannelMessageIDs(ids)
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if err != nil {
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return nil, domain.ChannelUpdateEvent{}, channel, err
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}
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rows, err := tx.Query(ctx, `
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SELECT `+channelMessageColumns+`
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FROM channel_messages
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WHERE channel_id = $1 AND id = ANY($2::int[]) AND NOT deleted
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ORDER BY id`, channel.ID, id32)
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if err != nil {
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return nil, domain.ChannelUpdateEvent{}, channel, fmt.Errorf("list channel messages for delete: %w", err)
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}
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byID := make(map[int]domain.ChannelMessage, len(ordered))
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for rows.Next() {
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msg, err := scanChannelMessage(rows)
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if err != nil {
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rows.Close()
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return nil, domain.ChannelUpdateEvent{}, channel, err
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}
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byID[msg.ID] = msg
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}
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if err := rows.Err(); err != nil {
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rows.Close()
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return nil, domain.ChannelUpdateEvent{}, channel, err
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}
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rows.Close()
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deleted := make([]int, 0, len(ordered))
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for _, id := range ordered {
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msg, ok := byID[id]
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if !ok {
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continue
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}
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if msg.SenderUserID != actorUserID && !canDeleteAnyChannelMessage(member) {
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return nil, domain.ChannelUpdateEvent{}, channel, domain.ErrChannelAdminRequired
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}
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if id <= 1 {
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// id=1 建群服务消息是清空后会话仅剩的兜底 top message，所有
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// 删除入口统一静默跳过（官方客户端对它禁用删除）。
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continue
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}
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deleted = append(deleted, id)
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if err := s.insertChannelAdminLogTx(ctx, tx, domain.ChannelAdminLogEvent{
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ChannelID: channel.ID,
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UserID: actorUserID,
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Date: date,
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Type: domain.ChannelAdminLogDeleteMessage,
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Message: &msg,
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Query: msg.Body,
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}); err != nil {
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return nil, domain.ChannelUpdateEvent{}, channel, err
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}
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}
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if len(deleted) == 0 {
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return nil, domain.ChannelUpdateEvent{}, channel, nil
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}
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pts, err := s.reserveChannelPtsN(ctx, tx, channel.ID, len(deleted))
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if err != nil {
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return nil, domain.ChannelUpdateEvent{}, channel, fmt.Errorf("allocate channel delete pts: %w", err)
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}
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deleted32 := int32s(deleted)
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if _, err := tx.Exec(ctx, `
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UPDATE channel_messages
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SET deleted = true, pts = $3, updated_at = now()
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WHERE channel_id = $1 AND id = ANY($2::int[])`, channel.ID, deleted32, pts); err != nil {
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return nil, domain.ChannelUpdateEvent{}, channel, fmt.Errorf("soft delete channel messages: %w", err)
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}
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if err := deleteChannelUnreadMentionsTx(ctx, tx, channel.ID, deleted); err != nil {
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return nil, domain.ChannelUpdateEvent{}, channel, err
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}
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if err := refreshChannelUnreadReactionsCountsForMessagesTx(ctx, tx, channel.ID, deleted); err != nil {
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return nil, domain.ChannelUpdateEvent{}, channel, err
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}
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topID, err := topNonDeletedChannelMessageID(ctx, tx, channel.ID)
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if err != nil {
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return nil, domain.ChannelUpdateEvent{}, channel, err
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}
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var latestPinned int
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if err := tx.QueryRow(ctx, `
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UPDATE channels
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SET top_message_id = $2, pts = $3,
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-- 删除即从置顶集合移除（pinned 查询过滤 NOT deleted 自动免疫），
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-- 这里同步重算「最新置顶 id」缓存避免悬挂。
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pinned_message_id = COALESCE((
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SELECT MAX(id) FROM channel_messages
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WHERE channel_id = $1 AND pinned AND NOT deleted
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), 0),
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updated_at = now()
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WHERE id = $1
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RETURNING pinned_message_id`, channel.ID, topID, pts).Scan(&latestPinned); err != nil {
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return nil, domain.ChannelUpdateEvent{}, channel, fmt.Errorf("update channel top after delete: %w", err)
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}
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channel.TopMessageID = topID
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channel.Pts = pts
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channel.PinnedMessageID = latestPinned
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// 删除后不再对全员刷新 channel_dialogs 缓存行（性能审计 H4a）：unread 读时由
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// 可见 incoming 消息动态派生（deleted 自动出列），top 由 channels.top_message_id 提供。
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event := domain.ChannelUpdateEvent{
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ChannelID: channel.ID,
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Type: domain.ChannelUpdateDeleteMessages,
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Pts: pts,
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PtsCount: len(deleted),
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Date: date,
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MessageIDs: append([]int(nil), deleted...),
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SenderUserID: actorUserID,
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}
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if err := insertChannelEventTx(ctx, tx, event); err != nil {
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return nil, domain.ChannelUpdateEvent{}, channel, err
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}
|
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return deleted, event, channel, nil
|
||
}
|
||
|
||
func validUniqueChannelMessageIDs(ids []int) ([]int32, []int, error) {
|
||
seen := make(map[int]struct{}, len(ids))
|
||
out := make([]int, 0, len(ids))
|
||
for _, id := range ids {
|
||
if id <= 0 || id > domain.MaxMessageBoxID {
|
||
return nil, nil, domain.ErrMessageIDInvalid
|
||
}
|
||
if _, ok := seen[id]; ok {
|
||
continue
|
||
}
|
||
seen[id] = struct{}{}
|
||
out = append(out, id)
|
||
}
|
||
return int32s(out), out, nil
|
||
}
|
||
|
||
func topNonDeletedChannelMessageID(ctx context.Context, db sqlcgen.DBTX, channelID int64) (int, error) {
|
||
var id int
|
||
if err := db.QueryRow(ctx, `SELECT COALESCE(MAX(id), 0) FROM channel_messages WHERE channel_id = $1 AND NOT deleted`, channelID).Scan(&id); err != nil {
|
||
return 0, fmt.Errorf("select channel top after delete: %w", err)
|
||
}
|
||
return id, nil
|
||
}
|
||
|
||
func canDeleteAnyChannelMessage(member domain.ChannelMember) bool {
|
||
return member.Role == domain.ChannelRoleCreator || (member.Role == domain.ChannelRoleAdmin && member.AdminRights.DeleteMessages)
|
||
}
|