forked from
tangled.org/core
Monorepo for Tangled
appview/db: avoid N+1 queries in follow/star status fetching
Use a bulk fetcher for both.
Signed-off-by: Anirudh Oppiliappan <anirudh@tangled.sh>
author
Anirudh Oppiliappan
committer
Tangled
date
(Sep 19, 2025, 2:08 PM UTC)
commit
890e7863
890e7863a6987e682c7e511cab1b17e26e69a209
parent
04314f77
04314f7739a9fb9bb2855244c5f44a0b1e47c759
+158
-13
+65
-5
appview/db/follow.go
+65
-5
appview/db/follow.go
···
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}
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}
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+
func getFollowStatuses(e Execer, userDid string, subjectDids []string) (map[string]FollowStatus, error) {
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if len(subjectDids) == 0 || userDid == "" {
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return make(map[string]FollowStatus), nil
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}
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+
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result := make(map[string]FollowStatus)
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+
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for _, subjectDid := range subjectDids {
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if userDid == subjectDid {
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result[subjectDid] = IsSelf
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} else {
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result[subjectDid] = IsNotFollowing
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}
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}
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+
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var querySubjects []string
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for _, subjectDid := range subjectDids {
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if userDid != subjectDid {
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querySubjects = append(querySubjects, subjectDid)
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}
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}
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if len(querySubjects) == 0 {
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return result, nil
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}
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placeholders := make([]string, len(querySubjects))
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args := make([]any, len(querySubjects)+1)
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args[0] = userDid
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for i, subjectDid := range querySubjects {
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placeholders[i] = "?"
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args[i+1] = subjectDid
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}
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query := fmt.Sprintf(`
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SELECT subject_did
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FROM follows
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WHERE user_did = ? AND subject_did IN (%s)
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`, strings.Join(placeholders, ","))
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+
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rows, err := e.Query(query, args...)
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if err != nil {
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return nil, err
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}
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defer rows.Close()
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for rows.Next() {
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var subjectDid string
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if err := rows.Scan(&subjectDid); err != nil {
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return nil, err
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}
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result[subjectDid] = IsFollowing
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}
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return result, nil
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}
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+
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func GetFollowStatus(e Execer, userDid, subjectDid string) FollowStatus {
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-
if userDid == subjectDid {
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return IsSelf
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-
} else if _, err := GetFollow(e, userDid, subjectDid); err != nil {
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statuses, err := getFollowStatuses(e, userDid, []string{subjectDid})
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if err != nil {
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return IsNotFollowing
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-
} else {
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return IsFollowing
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}
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return statuses[subjectDid]
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}
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func GetFollowStatuses(e Execer, userDid string, subjectDids []string) (map[string]FollowStatus, error) {
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return getFollowStatuses(e, userDid, subjectDids)
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}
+53
-3
appview/db/star.go
+53
-3
appview/db/star.go
···
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return stars, nil
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}
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// getStarStatuses returns a map of repo URIs to star status for a given user
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// This is an internal helper function to avoid N+1 queries
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func getStarStatuses(e Execer, userDid string, repoAts []syntax.ATURI) (map[string]bool, error) {
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if len(repoAts) == 0 || userDid == "" {
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return make(map[string]bool), nil
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}
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placeholders := make([]string, len(repoAts))
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args := make([]any, len(repoAts)+1)
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args[0] = userDid
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for i, repoAt := range repoAts {
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placeholders[i] = "?"
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args[i+1] = repoAt.String()
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}
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query := fmt.Sprintf(`
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SELECT repo_at
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FROM stars
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WHERE starred_by_did = ? AND repo_at IN (%s)
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`, strings.Join(placeholders, ","))
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rows, err := e.Query(query, args...)
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if err != nil {
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return nil, err
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}
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defer rows.Close()
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result := make(map[string]bool)
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// Initialize all repos as not starred
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for _, repoAt := range repoAts {
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result[repoAt.String()] = false
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}
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// Mark starred repos as true
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for rows.Next() {
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var repoAt string
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if err := rows.Scan(&repoAt); err != nil {
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return nil, err
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}
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result[repoAt] = true
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}
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return result, nil
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}
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func GetStarStatus(e Execer, userDid string, repoAt syntax.ATURI) bool {
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if _, err := GetStar(e, userDid, repoAt); err != nil {
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statuses, err := getStarStatuses(e, userDid, []syntax.ATURI{repoAt})
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if err != nil {
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return false
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-
} else {
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return true
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}
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return statuses[repoAt.String()]
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}
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// GetStarStatuses returns a map of repo URIs to star status for a given user
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func GetStarStatuses(e Execer, userDid string, repoAts []syntax.ATURI) (map[string]bool, error) {
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return getStarStatuses(e, userDid, repoAts)
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}
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func GetStars(e Execer, limit int, filters ...filter) ([]Star, error) {
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var conditions []string
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var args []any
+40
-5
appview/db/timeline.go
+40
-5
appview/db/timeline.go
···
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3
import (
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"sort"
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"time"
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+
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"github.com/bluesky-social/indigo/atproto/syntax"
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)
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type TimelineEvent struct {
···
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func MakeTimeline(e Execer, limit int, loggedInUserDid string) ([]TimelineEvent, error) {
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var events []TimelineEvent
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repos, err := getTimelineRepos(e, limit)
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repos, err := getTimelineRepos(e, limit, loggedInUserDid)
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if err != nil {
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return nil, err
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}
···
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return events, nil
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}
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-
func getTimelineRepos(e Execer, limit int) ([]TimelineEvent, error) {
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func getTimelineRepos(e Execer, limit int, loggedInUserDid string) ([]TimelineEvent, error) {
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repos, err := GetRepos(e, limit)
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if err != nil {
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return nil, err
···
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uriToRepo[r.RepoAt().String()] = r
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}
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var starStatuses map[string]bool
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if loggedInUserDid != "" {
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var repoAts []syntax.ATURI
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for _, r := range repos {
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repoAts = append(repoAts, r.RepoAt())
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}
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var err error
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starStatuses, err = GetStarStatuses(e, loggedInUserDid, repoAts)
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if err != nil {
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return nil, err
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}
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}
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var events []TimelineEvent
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for _, r := range repos {
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var source *Repo
···
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}
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}
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var isStarred bool
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if starStatuses != nil {
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isStarred = starStatuses[r.RepoAt().String()]
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}
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var starCount int64
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if r.RepoStats != nil {
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starCount = int64(r.RepoStats.StarCount)
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}
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events = append(events, TimelineEvent{
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Repo: &r,
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EventAt: r.Created,
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Source: source,
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Repo: &r,
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EventAt: r.Created,
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Source: source,
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IsStarred: isStarred,
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StarCount: starCount,
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})
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}
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···
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followStatMap, err := GetFollowerFollowingCounts(e, subjects)
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if err != nil {
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return nil, err
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}
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var followStatuses map[string]FollowStatus
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if loggedInUserDid != "" {
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followStatuses, err = GetFollowStatuses(e, loggedInUserDid, subjects)
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if err != nil {
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return nil, err
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}
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}
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var events []TimelineEvent