refactor: cache since, dont dedupe by host

src/hooks/live-chat.tsx

@@ -11,9 +11,10 @@ import { useMemo } from "react";
 import { LIVE_STREAM_CHAT } from "const";
 
 export function useLiveChatFeed(link: NostrLink, eZaps?: Array<string>) {
-  const since = useMemo(() =>
-    unixNow() - (60 * 60 * 24 * 7), // 7-days of zaps
-  [link.id]);
+  const since = useMemo(
+    () => unixNow() - 60 * 60 * 24 * 7, // 7-days of zaps
+    [link.id],
+  );
   const sub = useMemo(() => {
     const rb = new RequestBuilder(`live:${link.id}:${link.author}`);
     rb.withOptions({
@@ -57,7 +58,7 @@ export function useLiveChatFeed(link: NostrLink, eZaps?: Array<string>) {
   const reactionsSub = useRequestBuilder<FlatNoteStore>(
     System,
     FlatNoteStore,
-    esub
+    esub,
   );
 
   const reactions = reactionsSub.data ?? [];

src/hooks/live-streams.ts

@@ -6,26 +6,22 @@ import { useRequestBuilder } from "@snort/system-react";
 import { unixNow } from "@snort/shared";
 import { LIVE_STREAM } from "const";
 import { System, StreamState } from "index";
-import { findTag, dedupeByHost } from "utils";
+import { findTag } from "utils";
 
 export function useStreamsFeed(tag?: string) {
+  const since = useMemo(() => unixNow() - 86400, [tag]);
   const rb = useMemo(() => {
     const rb = new RequestBuilder(tag ? `streams:${tag}` : "streams");
     rb.withOptions({
       leaveOpen: true,
     });
     if (tag) {
-      rb.withFilter()
-        .kinds([LIVE_STREAM])
-        .tag("t", [tag])
-        .since(unixNow() - 86400);
+      rb.withFilter().kinds([LIVE_STREAM]).tag("t", [tag]).since(since);
     } else {
-      rb.withFilter()
-        .kinds([LIVE_STREAM])
-        .since(unixNow() - 86400);
+      rb.withFilter().kinds([LIVE_STREAM]).since(since);
     }
     return rb;
-  }, [tag]);
+  }, [tag, since]);
 
   const feed = useRequestBuilder<NoteCollection>(System, NoteCollection, rb);
   const feedSorted = useMemo(() => {
@@ -45,19 +41,17 @@ export function useStreamsFeed(tag?: string) {
     return [];
   }, [feed.data]);
 
-  const live = dedupeByHost(
-    feedSorted.filter((a) => findTag(a, "status") === StreamState.Live),
+  const live = feedSorted.filter(
+    (a) => findTag(a, "status") === StreamState.Live,
   );
-  const planned = dedupeByHost(
-    feedSorted.filter((a) => findTag(a, "status") === StreamState.Planned),
-  );
-  const ended = dedupeByHost(
-    feedSorted.filter((a) => {
-      const hasEnded = findTag(a, "status") === StreamState.Ended;
-      const recording = findTag(a, "recording");
-      return hasEnded && recording?.length > 0;
-    }),
+  const planned = feedSorted.filter(
+    (a) => findTag(a, "status") === StreamState.Planned,
   );
+  const ended = feedSorted.filter((a) => {
+    const hasEnded = findTag(a, "status") === StreamState.Ended;
+    const recording = findTag(a, "recording");
+    return hasEnded && recording?.length > 0;
+  });
 
   return { live, planned, ended };
 }

src/pages/root.tsx

@@ -3,25 +3,26 @@ import type { NostrEvent } from "@snort/system";
 
 import { VideoTile } from "element/video-tile";
 import { useLogin } from "hooks/login";
-import { getHost, getTagValues, dedupeByHost } from "utils";
+import { getHost, getTagValues } from "utils";
 import { useStreamsFeed } from "hooks/live-streams";
 
 export function RootPage() {
   const login = useLogin();
 
   const { live, planned, ended } = useStreamsFeed();
-  const mutedHosts = getTagValues(login?.muted.tags ?? [], "p");
+  const mutedHosts = new Set(getTagValues(login?.muted.tags ?? [], "p"));
   const followsHost = (ev: NostrEvent) => {
     return login?.follows.tags?.find((t) => t.at(1) === getHost(ev));
   };
   const hashtags = getTagValues(login?.follows.tags ?? [], "t");
-  const following = dedupeByHost(live.filter(followsHost));
-  const liveNow = dedupeByHost(live.filter((e) => !following.includes(e)));
+  const following = live.filter(followsHost);
+  const liveNow = live.filter((e) => !following.includes(e));
   const hasFollowingLive = following.length > 0;
 
   const plannedEvents = planned
-    .filter((e) => !mutedHosts.includes(getHost(e)))
+    .filter((e) => !mutedHosts.has(getHost(e)))
     .filter(followsHost);
+  const endedEvents = ended.filter((e) => !mutedHosts.has(getHost(e)));
 
   return (
     <div className="homepage">
@@ -35,7 +36,7 @@ export function RootPage() {
       {!hasFollowingLive && (
         <div className="video-grid">
           {live
-            .filter((e) => !mutedHosts.includes(getHost(e)))
+            .filter((e) => !mutedHosts.has(getHost(e)))
             .map((e) => (
               <VideoTile ev={e} key={e.id} />
             ))}
@@ -46,7 +47,7 @@ export function RootPage() {
           <h2 className="divider line one-line">#{t}</h2>
           <div className="video-grid">
             {live
-              .filter((e) => !mutedHosts.includes(getHost(e)))
+              .filter((e) => !mutedHosts.has(getHost(e)))
               .filter((e) => {
                 const evTags = getTagValues(e.tags, "t");
                 return evTags.includes(t);
@@ -62,7 +63,7 @@ export function RootPage() {
           <h2 className="divider line one-line">Live</h2>
           <div className="video-grid">
             {liveNow
-              .filter((e) => !mutedHosts.includes(getHost(e)))
+              .filter((e) => !mutedHosts.has(getHost(e)))
               .map((e) => (
                 <VideoTile ev={e} key={e.id} />
               ))}
@@ -79,15 +80,13 @@ export function RootPage() {
           </div>
         </>
       )}
-      {ended.length > 0 && (
+      {endedEvents.length > 0 && (
         <>
           <h2 className="divider line one-line">Ended</h2>
           <div className="video-grid">
-            {ended
-              .filter((e) => !mutedHosts.includes(getHost(e)))
-              .map((e) => (
-                <VideoTile ev={e} key={e.id} />
-              ))}
+            {endedEvents.map((e) => (
+              <VideoTile ev={e} key={e.id} />
+            ))}
           </div>
         </>
       )}

src/utils.ts

@@ -94,22 +94,3 @@ export async function openFile(): Promise<File | undefined> {
 export function getTagValues(tags: Array<string[]>, tag: string) {
   return tags.filter((t) => t.at(0) === tag).map((t) => t.at(1));
 }
-
-export function dedupeByHost(events: Array<NostrEvent>) {
-  const { result } = events.reduce(
-    ({ result, seen }, ev) => {
-      const host = getHost(ev);
-      if (seen.has(host)) {
-        return { result, seen };
-      }
-      result.push(ev);
-      seen.add(host);
-      return { result, seen };
-    },
-    {
-      result: [],
-      seen: new Set(),
-    },
-  );
-  return result;
-}