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feat(feed/chat): lazy-render + pagination for long scrolls

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Server pagination
  - blockchain.PostsByAuthor signature extended with beforeTs int64;
    passing 0 keeps the previous "everything, newest first" behaviour,
    non-zero skips posts with CreatedAt >= beforeTs so clients can
    paginate older results.
  - node.FeedConfig.PostsByAuthor callback type updated; the two
    /feed endpoints that use it (timeline + author) now accept
    `?before=<unix_seconds>` and forward it through. /feed/author
    limit default dropped from 50 to 30 to match the client's page
    size.
  - node/api_common.go: new queryInt64 helper for parsing the cursor
    param safely (matches the queryInt pattern already used).

Client infinite scroll (Feed tab)
  - lib/feed.ts: fetchTimeline / fetchAuthorPosts accept
    `{limit?, before?}` options. Old signatures still work for other
    callers (fetchForYou / fetchTrending / fetchHashtag) — those are
    ranked feeds that don't have a stable cursor so they stay
    single-shot.
  - feed/index.tsx: tracks loadingMore / exhausted state. onEndReached
    (threshold 0.6) fires loadMore() which fetches the next 20 posts
    using the oldest currently-loaded post's created_at as `before`.
    Deduplicates on post_id before appending. Stops when the server
    returns < PAGE_SIZE items. ListFooterComponent shows a small
    spinner during paginated fetches.
  - FlatList lazy-render tuning on all feed lists (index + hashtag):
    initialNumToRender:10, maxToRenderPerBatch:8, windowSize:7,
    removeClippedSubviews — first paint stays quick even with 100+
    posts loaded.

Chat lazy render
  - chats/[id].tsx FlatList: initialNumToRender:25 (~1.5 screens),
    maxToRenderPerBatch:12, windowSize:10, removeClippedSubviews.
    Keeps initial chat open snappy on conversations with thousands
    of messages; RN re-renders a small window around the viewport
    and drops the rest.

Tests
  - chain_test.go updated for new PostsByAuthor signature.
  - All 7 Go packages green.
  - tsc --noEmit clean.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
vsecoder
2026-04-18 21:51:43 +03:00
parent 1c6622e809
commit 6425b5cffb
8 changed files with 137 additions and 14 deletions
Download Patch File Download Diff File Expand all files Collapse all files

14
node/api_feed.go
View File

@@ -72,7 +72,7 @@ type FeedConfig struct {
GetPost func(postID string) (*blockchain.PostRecord, error)
LikeCount func(postID string) (uint64, error)
HasLiked func(postID, likerPub string) (bool, error)
PostsByAuthor func(authorPub string, limit int) ([]*blockchain.PostRecord, error)
PostsByAuthor func(authorPub string, beforeTs int64, limit int) ([]*blockchain.PostRecord, error)
Following func(followerPub string) ([]string, error)
}
@@ -440,13 +440,14 @@ func feedAuthor(cfg FeedConfig) http.HandlerFunc {
jsonErr(w, fmt.Errorf("author pub required"), 400)
return
}
limit := queryInt(r, "limit", 50)
limit := queryInt(r, "limit", 30)
beforeTs := queryInt64(r, "before", 0) // pagination cursor (unix seconds)
// Prefer chain-authoritative list (includes soft-deleted flag) so
// clients can't be fooled by a stale relay that has an already-
// deleted post. If chain isn't wired, fall back to relay index.
if cfg.PostsByAuthor != nil {
records, err := cfg.PostsByAuthor(pub, limit)
records, err := cfg.PostsByAuthor(pub, beforeTs, limit)
if err != nil {
jsonErr(w, err, 500)
return
@@ -461,6 +462,8 @@ func feedAuthor(cfg FeedConfig) http.HandlerFunc {
jsonOK(w, map[string]any{"author": pub, "count": len(out), "posts": out})
return
}
// Fallback: relay index (no chain). Doesn't support `before` yet;
// the chain-authoritative path above is what production serves.
ids, err := cfg.Mailbox.PostsByAuthor(pub, limit)
if err != nil {
jsonErr(w, err, 500)
@@ -556,7 +559,8 @@ func feedTimeline(cfg FeedConfig) http.HandlerFunc {
jsonErr(w, fmt.Errorf("timeline requires chain queries"), 503)
return
}
limit := queryInt(r, "limit", 50)
limit := queryInt(r, "limit", 30)
beforeTs := queryInt64(r, "before", 0) // pagination cursor
perAuthor := limit
if perAuthor > 30 {
perAuthor = 30
@@ -569,7 +573,7 @@ func feedTimeline(cfg FeedConfig) http.HandlerFunc {
}
var merged []*blockchain.PostRecord
for _, target := range following {
posts, err := cfg.PostsByAuthor(target, perAuthor)
posts, err := cfg.PostsByAuthor(target, beforeTs, perAuthor)
if err != nil {
continue
}