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Send a changed feed's row to the page instead of it reloading the list (#105)

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After a feed was checked, failed or downloaded a file, and after every item read, the page
fetched /api/feeds whole, about 60 ms for 160 rows, though one row had changed. The live event
stream now knows who is connected and, after an event that changes a feed, sends that person
its row (feed_row), built by the same code as the list (feed_rows, with Db::feed_list asked for
one feed). Marking an item read answers with the feed's row. The page puts the row in place
and redraws once a frame. A routine skip of a feed not due sends nothing.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Ray Slakinski
2026-09-29 20:41:43 +00:00
parent 7a134b810f
commit c7f13eea2f
7 changed files with 107 additions and 25 deletions
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14
web/src/events.ts
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@@ -3,7 +3,6 @@ let sse;
function connect(){
sse=new EventSource('/api/events');
const soon=(fn,ms=500)=>{ let t; return ()=>{ clearTimeout(t); t=setTimeout(fn,ms); }; };
const refreshFeeds=soon(()=>loadFeeds(true));
const refreshEntries=soon(()=>{ if(S.feed) loadEntries(); });
// Every scan's events reach everyone; only this person's feeds are theirs to show or refresh.
const mine=id=>S.feeds.some(f=>f.id===id);
@@ -22,7 +21,7 @@ function connect(){
// Said only for a file on screen, as one downloaded by hand is: the scheduled downloads of
// everyone's feeds used to announce themselves to everyone.
if(bar){ bar.classList.remove('live'); toast('Downloaded '+ev.path.split('/').pop()); }
refreshEntries(); refreshFeeds();
refreshEntries();
}
else if(ev.ev==='download_error'){
const bar=document.querySelector(`.dlbar[data-bar="${ev.enclosure}"]`);
@@ -35,14 +34,19 @@ function connect(){
else if(ev.ev==='feed_done'){
setScanning(ev.feed,false);
if(!mine(ev.feed)) return;
refreshFeeds(); if(ev.feed===S.feed||S.feed===':all') refreshEntries();
if(ev.feed===S.feed||S.feed===':all') refreshEntries();
}
// No toast: a scan of every feed raised one per failure, to everyone. The feed list's
// red ! marks the feed instead, and its page says why.
else if(ev.ev==='feed_error'){ setScanning(ev.feed,false); if(mine(ev.feed)) refreshFeeds(); }
else if(ev.ev==='feed_error') setScanning(ev.feed,false);
// The server sends a feed's new row after anything changes it (counts, error, last check),
// only to those who subscribe; the page used to reload the whole list after each event.
else if(ev.ev==='feed_row') patchFeed(ev.row);
// Only a scan that checked something: the scheduler scans every minute, due or not, and
// every open page reloaded the whole list each time (#103).
else if(ev.ev==='scan_done'){ scanning.clear(); paintScanning(); if(ev.feeds){ refreshFeeds(); refreshEntries(); } }
// Rows came as feed_row events. ponytail: a feed an OPML drops stays in the list until the
// page reloads; reload the list here when a scan synced an OPML if that ever matters.
else if(ev.ev==='scan_done'){ scanning.clear(); paintScanning(); if(ev.feeds) refreshEntries(); }
};
sse.onerror=()=>{ sse.close(); setTimeout(connect,4000); };
}