293 lines
10 KiB
Go
293 lines
10 KiB
Go
package postgres
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import (
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"context"
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"fmt"
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"strconv"
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"strings"
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"telesrv/internal/domain"
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"telesrv/internal/store/postgres/sqlcgen"
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)
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type channelReactionMessageKey struct {
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channelID int64
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messageID int
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}
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// channelMessagePairs 把 {channelID: [messageID...]} 摊平成两条等长并行数组，供
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// `WHERE (channel_id, message_id) IN (SELECT * FROM unnest($a::bigint[], $b::int[]))`
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// 跨频道一次批量取，消除「每频道一条 SQL」的 N+1。
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func channelMessagePairs(idsByChannel map[int64][]int32) ([]int64, []int32) {
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var channels []int64
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var messages []int32
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for channelID, ids := range idsByChannel {
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for _, id := range ids {
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channels = append(channels, channelID)
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messages = append(messages, id)
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}
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}
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return channels, messages
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}
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type channelReactionCursor struct {
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date int
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userID int64
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reactionType domain.MessageReactionType
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value string
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legacyValue bool
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}
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func emptyChannelMessageReactions(channel domain.Channel) domain.ChannelMessageReactions {
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return domain.ChannelMessageReactions{
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CanSeeList: !channel.Broadcast || channel.Megagroup,
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Results: []domain.ChannelMessageReactionCount{},
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Recent: []domain.ChannelMessagePeerReaction{},
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}
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}
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func (s *ChannelStore) populateChannelMessagesReactions(ctx context.Context, db sqlcgen.DBTX, viewerUserID int64, channels []domain.Channel, messages []domain.ChannelMessage) error {
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return s.populateChannelMessagesReactionsWhere(ctx, db, viewerUserID, channels, messages, nil, false)
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}
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func (s *ChannelStore) populateChannelMessagesReactionsWhere(
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ctx context.Context,
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db sqlcgen.DBTX,
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viewerUserID int64,
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channels []domain.Channel,
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messages []domain.ChannelMessage,
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reactionEligible func(domain.ChannelMessage) bool,
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unreadAlreadyProjected bool,
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) error {
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if len(messages) == 0 {
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return nil
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}
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// poll enrichment 与 reactions 同点位挂载：所有频道消息读路径都经过本函数（见 channel_polls.go）。
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if err := s.populateChannelMessagesPolls(ctx, db, viewerUserID, messages); err != nil {
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return err
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}
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if !unreadAlreadyProjected {
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if err := populateChannelMessageUnreadFlags(ctx, db, viewerUserID, messages); err != nil {
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return err
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}
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}
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channelsByID := make(map[int64]domain.Channel, len(channels))
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for _, ch := range channels {
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if ch.ID != 0 {
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channelsByID[ch.ID] = ch
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}
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}
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indexes := make(map[channelReactionMessageKey][]int)
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idsByChannel := make(map[int64][]int32)
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for i := range messages {
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if messages[i].ChannelID == 0 || messages[i].ID <= 0 {
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continue
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}
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if reactionEligible != nil && !reactionEligible(messages[i]) {
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continue
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}
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key := channelReactionMessageKey{channelID: messages[i].ChannelID, messageID: messages[i].ID}
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if _, ok := indexes[key]; !ok {
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idsByChannel[messages[i].ChannelID] = append(idsByChannel[messages[i].ChannelID], int32(messages[i].ID))
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}
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indexes[key] = append(indexes[key], i)
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}
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if len(idsByChannel) == 0 {
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return nil
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}
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// 缺失的频道元数据一次批量补齐（emptyChannelMessageReactions 需要 Broadcast/Megagroup），
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// 替代原来「每个未知频道一条 getChannelByID」的 N+1。
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var missing []int64
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for channelID := range idsByChannel {
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if _, ok := channelsByID[channelID]; !ok {
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missing = append(missing, channelID)
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}
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}
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if len(missing) > 0 {
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fetched, err := listChannelsByIDs(ctx, db, missing)
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if err != nil {
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return err
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}
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for _, ch := range fetched {
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channelsByID[ch.ID] = ch
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}
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}
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// 跨频道 (channel, message) 对；recent 反应仅对「非广播或超级群」频道下发（广播 reaction
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// 匿名，与官方一致只给计数，不暴露反应者身份）。
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pairChannels, pairMessages := channelMessagePairs(idsByChannel)
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var recentChannels []int64
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var recentMessages []int32
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for channelID, ids := range idsByChannel {
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ch := channelsByID[channelID]
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if ch.Broadcast && !ch.Megagroup {
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continue
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}
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for _, id := range ids {
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recentChannels = append(recentChannels, channelID)
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recentMessages = append(recentMessages, id)
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}
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}
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// 1) 反应计数：跨频道一次 GROUP BY。
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countRows, err := db.Query(ctx, `
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SELECT channel_id, message_id, reaction_type, reaction_value, COUNT(*)::int,
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COALESCE(MAX(CASE WHEN reacted_user_id = $1 THEN chosen_order ELSE 0 END), 0)::int,
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COALESCE(MAX(reaction_date), 0)::int
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FROM channel_message_reactions
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WHERE (channel_id, message_id) IN (SELECT * FROM unnest($2::bigint[], $3::int[]))
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GROUP BY channel_id, message_id, reaction_type, reaction_value
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ORDER BY channel_id ASC, message_id ASC, COUNT(*) DESC, COALESCE(MAX(reaction_date), 0) DESC, reaction_type ASC, reaction_value ASC`, viewerUserID, pairChannels, pairMessages)
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if err != nil {
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return fmt.Errorf("load channel message reaction counts: %w", err)
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}
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for countRows.Next() {
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var channelID int64
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var msgID int
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var reactionType, reactionValue string
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var count, chosenOrder, latestDate int
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if err := countRows.Scan(&channelID, &msgID, &reactionType, &reactionValue, &count, &chosenOrder, &latestDate); err != nil {
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countRows.Close()
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return err
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}
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_ = latestDate
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ch := channelsByID[channelID]
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key := channelReactionMessageKey{channelID: channelID, messageID: msgID}
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for _, idx := range indexes[key] {
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if messages[idx].Reactions == nil {
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reactions := emptyChannelMessageReactions(ch)
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messages[idx].Reactions = &reactions
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}
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reaction, ok := domain.MessageReactionFromValue(domain.MessageReactionType(reactionType), reactionValue)
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if !ok {
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continue
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}
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messages[idx].Reactions.Results = append(messages[idx].Reactions.Results, domain.ChannelMessageReactionCount{
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Reaction: reaction,
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Count: count,
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ChosenOrder: chosenOrder,
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})
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}
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}
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if err := countRows.Err(); err != nil {
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countRows.Close()
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return err
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}
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countRows.Close()
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// 2) recent 反应（仅超级群/非广播）：跨频道一次 window 查询，PARTITION BY (channel,message)。
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if len(recentChannels) > 0 {
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recentRows, err := db.Query(ctx, `
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SELECT channel_id, message_id, reacted_user_id, sender_user_id, reaction_type, reaction_value,
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big, unread, chosen_order, reaction_date
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FROM (
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SELECT channel_id, message_id, reacted_user_id, sender_user_id, reaction_type, reaction_value,
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big, unread, chosen_order, reaction_date,
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row_number() OVER (
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PARTITION BY channel_id, message_id
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ORDER BY reaction_date DESC, reacted_user_id DESC, reaction_type ASC, reaction_value ASC
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) AS rn
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FROM channel_message_reactions
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WHERE (channel_id, message_id) IN (SELECT * FROM unnest($1::bigint[], $2::int[]))
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) ranked
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WHERE rn <= $3
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ORDER BY channel_id ASC, message_id ASC, reaction_date DESC, reacted_user_id DESC, reaction_type ASC, reaction_value ASC`, recentChannels, recentMessages, domain.MaxChannelMessageReactionRecent)
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if err != nil {
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return fmt.Errorf("load channel message recent reactions: %w", err)
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}
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for recentRows.Next() {
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row, err := scanChannelMessagePeerReaction(recentRows, viewerUserID)
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if err != nil {
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recentRows.Close()
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return err
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}
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ch := channelsByID[row.ChannelID]
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key := channelReactionMessageKey{channelID: row.ChannelID, messageID: row.MessageID}
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for _, idx := range indexes[key] {
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if messages[idx].Reactions == nil {
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reactions := emptyChannelMessageReactions(ch)
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messages[idx].Reactions = &reactions
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}
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messages[idx].Reactions.Recent = append(messages[idx].Reactions.Recent, row)
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}
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}
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if err := recentRows.Err(); err != nil {
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recentRows.Close()
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return err
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}
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recentRows.Close()
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}
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return nil
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}
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// populateChannelDialogTopMessageReactions keeps poll and unread-mention
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// enrichment exact for every message, but uses the shared top-message
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// existence cache to avoid querying three reaction tables when no reaction row
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// can possibly contribute to the viewer projection.
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func (s *ChannelStore) populateChannelDialogTopMessageReactions(
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ctx context.Context,
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db sqlcgen.DBTX,
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viewerUserID int64,
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channels []domain.Channel,
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messages []domain.ChannelMessage,
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unreadAlreadyProjected bool,
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) error {
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if !s.topMessageCacheActive(db) || len(messages) == 0 {
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return s.populateChannelMessagesReactions(ctx, db, viewerUserID, channels, messages)
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}
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presence, err := s.topMsgCache.reactionPresenceFor(ctx, db, messages)
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if err != nil {
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return fmt.Errorf("load channel top reaction presence: %w", err)
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}
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return s.populateChannelMessagesReactionsWhere(ctx, db, viewerUserID, channels, messages, func(msg domain.ChannelMessage) bool {
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return presence[channelMessageLookupKey{channelID: msg.ChannelID, id: msg.ID}].any()
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}, unreadAlreadyProjected)
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}
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func channelReactionOffset(row domain.ChannelMessagePeerReaction) string {
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return strconv.Itoa(row.Date) + ":" + strconv.FormatInt(row.UserID, 10) + ":" + string(row.Reaction.Type) + ":" + row.Reaction.Value()
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}
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func parseChannelReactionOffset(offset string) (channelReactionCursor, bool) {
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parts := strings.SplitN(offset, ":", 4)
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if len(parts) != 3 && len(parts) != 4 {
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return channelReactionCursor{}, false
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}
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date, err := strconv.Atoi(parts[0])
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if err != nil || date < 0 {
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return channelReactionCursor{}, false
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}
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userID, err := strconv.ParseInt(parts[1], 10, 64)
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if err != nil || userID < 0 {
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return channelReactionCursor{}, false
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}
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if len(parts) == 3 {
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return channelReactionCursor{date: date, userID: userID, value: parts[2], legacyValue: true}, true
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}
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return channelReactionCursor{date: date, userID: userID, reactionType: domain.MessageReactionType(parts[2]), value: parts[3]}, true
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}
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func scanChannelMessagePeerReaction(row rowScanner, viewerUserID int64) (domain.ChannelMessagePeerReaction, error) {
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var out domain.ChannelMessagePeerReaction
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var reactionType, reactionValue string
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if err := row.Scan(
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&out.ChannelID,
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&out.MessageID,
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&out.UserID,
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&out.SenderUserID,
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&reactionType,
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&reactionValue,
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&out.Big,
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&out.Unread,
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&out.ChosenOrder,
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&out.Date,
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); err != nil {
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return domain.ChannelMessagePeerReaction{}, err
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}
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out.My = out.UserID == viewerUserID
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reaction, ok := domain.MessageReactionFromValue(domain.MessageReactionType(reactionType), reactionValue)
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if !ok {
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return domain.ChannelMessagePeerReaction{}, fmt.Errorf("invalid channel message reaction value")
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}
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out.Reaction = reaction
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return out, nil
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}
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