feat: redux timeline cache

packages/app/src/Element/Note.tsx

@@ -168,7 +168,7 @@ export default function Note(props: NoteProps) {
 
   useLayoutEffect(() => {
     if (entry && inView && extendable === false) {
-      const h = entry?.target.clientHeight ?? 0;
+      const h = (entry?.target as HTMLDivElement)?.offsetHeight ?? 0;
       if (h > 650) {
         setExtendable(true);
       }

packages/app/src/Element/Timeline.tsx

@@ -1,10 +1,10 @@
 import "./Timeline.css";
 import { FormattedMessage } from "react-intl";
-import { useCallback, useMemo } from "react";
+import { useCallback, useEffect, useMemo } from "react";
 import { useInView } from "react-intersection-observer";
 
 import ArrowUp from "Icons/ArrowUp";
-import { dedupeByPubkey, tagFilterOfTextRepost } from "Util";
+import { dedupeById, dedupeByPubkey, tagFilterOfTextRepost } from "Util";
 import ProfileImage from "Element/ProfileImage";
 import useTimelineFeed, { TimelineSubject } from "Feed/TimelineFeed";
 import { TaggedRawEvent } from "@snort/nostr";
@@ -16,6 +16,9 @@ import NoteReaction from "Element/NoteReaction";
 import useModeration from "Hooks/useModeration";
 import ProfilePreview from "./ProfilePreview";
 import Skeleton from "Element/Skeleton";
+import { useDispatch, useSelector } from "react-redux";
+import { RootState } from "State/Store";
+import { setTimeline } from "State/Cache";
 
 export interface TimelineProps {
   postsOnly: boolean;
@@ -38,7 +41,9 @@ export default function Timeline({
   relay,
 }: TimelineProps) {
   const { muted, isMuted } = useModeration();
-  const { main, related, latest, parent, loadMore, showLatest } = useTimelineFeed(subject, {
+  const dispatch = useDispatch();
+  const cache = useSelector((s: RootState) => s.cache.timeline);
+  const feed = useTimelineFeed(subject, {
     method,
     window: timeWindow,
     relay,
@@ -52,20 +57,34 @@ export default function Timeline({
         ?.filter(a => (postsOnly ? !a.tags.some(b => b[0] === "e") : true))
         .filter(a => ignoreModeration || !isMuted(a.pubkey));
     },
-    [postsOnly, muted]
+    [postsOnly, muted, ignoreModeration]
   );
 
   const mainFeed = useMemo(() => {
-    return filterPosts(main.notes);
-  }, [main, filterPosts]);
+    return filterPosts(cache.main);
+  }, [cache, filterPosts]);
 
   const latestFeed = useMemo(() => {
-    return filterPosts(latest.notes).filter(a => !mainFeed.some(b => b.id === a.id));
-  }, [latest, mainFeed, filterPosts]);
+    return filterPosts(cache.latest).filter(a => !mainFeed.some(b => b.id === a.id));
+  }, [cache, filterPosts]);
   const latestAuthors = useMemo(() => {
     return dedupeByPubkey(latestFeed).map(e => e.pubkey);
   }, [latestFeed]);
 
+  useEffect(() => {
+    const key = `${subject.type}-${subject.discriminator}`;
+    const newFeed = key !== cache.key;
+    dispatch(
+      setTimeline({
+        key: key,
+        main: dedupeById([...(newFeed ? [] : cache.main), ...feed.main.notes]),
+        latest: [...feed.latest.notes],
+        related: dedupeById([...(newFeed ? [] : cache.related), ...feed.related.notes]),
+        parent: dedupeById([...(newFeed ? [] : cache.parent), ...feed.parent.notes]),
+      })
+    );
+  }, [feed.main, feed.latest, feed.related, feed.parent]);
+
   function eventElement(e: TaggedRawEvent) {
     switch (e.kind) {
       case EventKind.SetMetadata: {
@@ -74,9 +93,9 @@ export default function Timeline({
       case EventKind.TextNote: {
         const eRef = e.tags.find(tagFilterOfTextRepost(e))?.at(1);
         if (eRef) {
-          return <NoteReaction data={e} key={e.id} root={parent.notes.find(a => a.id === eRef)} />;
+          return <NoteReaction data={e} key={e.id} root={cache.parent.find(a => a.id === eRef)} />;
         }
-        return <Note key={e.id} data={e} related={related.notes} ignoreModeration={ignoreModeration} />;
+        return <Note key={e.id} data={e} related={cache.related} ignoreModeration={ignoreModeration} />;
       }
       case EventKind.ZapReceipt: {
         const zap = parseZap(e);
@@ -85,18 +104,17 @@ export default function Timeline({
       case EventKind.Reaction:
       case EventKind.Repost: {
         const eRef = e.tags.find(a => a[0] === "e")?.at(1);
-        return <NoteReaction data={e} key={e.id} root={parent.notes.find(a => a.id === eRef)} />;
+        return <NoteReaction data={e} key={e.id} root={cache.parent.find(a => a.id === eRef)} />;
       }
     }
   }
 
   function onShowLatest(scrollToTop = false) {
-    showLatest();
+    feed.showLatest();
     if (scrollToTop) {
       window.scrollTo(0, 0);
     }
   }
-
   return (
     <div className="main-content">
       {latestFeed.length > 0 && (
@@ -126,7 +144,7 @@ export default function Timeline({
         </>
       )}
       {mainFeed.map(eventElement)}
-      <LoadMore onLoadMore={loadMore} shouldLoadMore={main.end}>
+      <LoadMore onLoadMore={feed.loadMore} shouldLoadMore={feed.main.end}>
         <Skeleton width="100%" height="120px" margin="0 0 16px 0" />
         <Skeleton width="100%" height="120px" margin="0 0 16px 0" />
         <Skeleton width="100%" height="120px" margin="0 0 16px 0" />

packages/app/src/Pages/Root.tsx

@@ -11,7 +11,7 @@ import { System } from "System";
 import { TimelineSubject } from "Feed/TimelineFeed";
 
 import messages from "./messages";
-import { debounce } from "Util";
+import { debounce, unwrap } from "Util";
 
 interface RelayOption {
   url: string;
@@ -46,11 +46,12 @@ export default function RootPage() {
     }
   });
   const [relay, setRelay] = useState<RelayOption>();
-  const [globalRelays, setGlobalRelays] = useState<RelayOption[]>([]);
+  const [allRelays, setAllRelays] = useState<RelayOption[]>();
   const tagTabs = tags.map((t, idx) => {
     return { text: `#${t}`, value: idx + 3 };
   });
   const tabs = [RootTab.Posts, RootTab.PostsAndReplies, RootTab.Global, ...tagTabs];
+  const isGlobal = loggedOut || tab.value === RootTab.Global.value;
 
   function followHints() {
     if (follows?.length === 0 && pubKey && tab !== RootTab.Global) {
@@ -69,28 +70,63 @@ export default function RootPage() {
     }
   }
 
+  function globalRelaySelector() {
+    if (!isGlobal || !allRelays || allRelays.length === 0) return null;
+
+    const paidRelays = allRelays.filter(a => a.paid);
+    const publicRelays = allRelays.filter(a => !a.paid);
+    return (
+      <div className="flex mb10 f-end">
+        <FormattedMessage
+          defaultMessage="Read global from"
+          description="Label for reading global feed from specific relays"
+        />
+        &nbsp;
+        <select onChange={e => setRelay(allRelays.find(a => a.url === e.target.value))} value={relay?.url}>
+          {paidRelays.length > 0 && (
+            <optgroup label="Paid Relays">
+              {paidRelays.map(a => (
+                <option key={a.url} value={a.url}>
+                  {new URL(a.url).host}
+                </option>
+              ))}
+            </optgroup>
+          )}
+          <optgroup label="Public Relays">
+            {publicRelays.map(a => (
+              <option key={a.url} value={a.url}>
+                {new URL(a.url).host}
+              </option>
+            ))}
+          </optgroup>
+        </select>
+      </div>
+    );
+  }
+
   useEffect(() => {
-    return debounce(1_000, () => {
-      const ret: RelayOption[] = [];
-      System.Sockets.forEach((v, k) => {
-        ret.push({
-          url: k,
-          paid: v.Info?.limitation?.payment_required ?? false,
+    if (isGlobal) {
+      return debounce(500, () => {
+        const ret: RelayOption[] = [];
+        System.Sockets.forEach((v, k) => {
+          ret.push({
+            url: k,
+            paid: v.Info?.limitation?.payment_required ?? false,
+          });
         });
+        ret.sort(a => (a.paid ? -1 : 1));
+
+        if (ret.length > 0 && !relay) {
+          setRelay(ret[0]);
+        }
+        setAllRelays(ret);
       });
-      ret.sort(a => (a.paid ? 1 : -1));
+    }
+  }, [relays, relay, tab]);
 
-      if (ret.length > 0 && !relay) {
-        setRelay(ret[0]);
-      }
-      setGlobalRelays(ret);
-    });
-  }, [relays, relay]);
-
-  const isGlobal = loggedOut || tab.value === RootTab.Global.value;
   const timelineSubect: TimelineSubject = (() => {
     if (isGlobal) {
-      return { type: "global", items: [], discriminator: "all" };
+      return { type: "global", items: [], discriminator: `all-${relay?.url}` };
     }
     if (tab.value >= 3) {
       const hashtag = tab.text.slice(1);
@@ -100,49 +136,29 @@ export default function RootPage() {
     return { type: "pubkey", items: follows, discriminator: "follows" };
   })();
 
-  const paidRelays = globalRelays.filter(a => a.paid);
-  const publicRelays = globalRelays.filter(a => !a.paid);
-  return (
-    <>
-      <div className="main-content">
-        {pubKey && <Tabs tabs={tabs} tab={tab} setTab={setTab} />}
-        {isGlobal && globalRelays.length > 0 && (
-          <div className="flex mb10 f-end">
-            <FormattedMessage
-              defaultMessage="Read global from"
-              description="Label for reading global feed from specific relays"
-            />
-            &nbsp;
-            <select onChange={e => setRelay(globalRelays.find(a => a.url === e.target.value))}>
-              {paidRelays.length > 0 && (
-                <optgroup label="Paid Relays">
-                  {paidRelays.map(a => (
-                    <option key={a.url} value={a.url}>
-                      {new URL(a.url).host}
-                    </option>
-                  ))}
-                </optgroup>
-              )}
-              <optgroup label="Public Relays">
-                {publicRelays.map(a => (
-                  <option key={a.url} value={a.url}>
-                    {new URL(a.url).host}
-                  </option>
-                ))}
-              </optgroup>
-            </select>
-          </div>
-        )}
-      </div>
-      {followHints()}
+  function renderTimeline() {
+    if (isGlobal && !relay) return null;
+
+    return (
       <Timeline
         key={tab.value}
         subject={timelineSubect}
         postsOnly={tab.value === RootTab.Posts.value}
         method={"TIME_RANGE"}
         window={undefined}
-        relay={isGlobal ? relay?.url : undefined}
+        relay={isGlobal ? unwrap(relay).url : undefined}
       />
+    );
+  }
+
+  return (
+    <>
+      <div className="main-content">
+        {pubKey && <Tabs tabs={tabs} tab={tab} setTab={setTab} />}
+        {globalRelaySelector()}
+      </div>
+      {followHints()}
+      {renderTimeline()}
     </>
   );
 }

packages/app/src/State/Cache.ts

@@ -0,0 +1,38 @@
+import { createSlice, PayloadAction } from "@reduxjs/toolkit";
+import { TaggedRawEvent, u256 } from "@snort/nostr";
+
+export interface TimelineCache {
+  key: string;
+  main: TaggedRawEvent[];
+  related: TaggedRawEvent[];
+  latest: TaggedRawEvent[];
+  parent: TaggedRawEvent[];
+}
+
+export interface FeedCache {
+  timeline: TimelineCache;
+}
+
+const InitState = {
+  timeline: {
+    key: "",
+    main: [],
+    related: [],
+    latest: [],
+    parent: [],
+  },
+} as FeedCache;
+
+const CacheSlice = createSlice({
+  name: "Cache",
+  initialState: InitState,
+  reducers: {
+    setTimeline: (state, action: PayloadAction<TimelineCache>) => {
+      state.timeline = action.payload;
+    },
+  },
+});
+
+export const { setTimeline } = CacheSlice.actions;
+
+export const reducer = CacheSlice.reducer;

packages/app/src/State/Store.ts

@@ -1,11 +1,13 @@
 import { configureStore } from "@reduxjs/toolkit";
 import { reducer as LoginReducer } from "State/Login";
 import { reducer as UsersReducer } from "State/Users";
+import { reducer as CacheReducer } from "State/Cache";
 
 const store = configureStore({
   reducer: {
     login: LoginReducer,
     users: UsersReducer,
+    cache: CacheReducer,
   },
 });
 

packages/app/src/Util.ts

@@ -177,6 +177,23 @@ export function dedupeByPubkey(events: TaggedRawEvent[]) {
   return deduped.list as TaggedRawEvent[];
 }
 
+export function dedupeById(events: TaggedRawEvent[]) {
+  const deduped = events.reduce(
+    ({ list, seen }: { list: TaggedRawEvent[]; seen: Set<HexKey> }, ev) => {
+      if (seen.has(ev.id)) {
+        return { list, seen };
+      }
+      seen.add(ev.id);
+      return {
+        seen,
+        list: [...list, ev],
+      };
+    },
+    { list: [], seen: new Set([]) }
+  );
+  return deduped.list as TaggedRawEvent[];
+}
+
 export function unwrap<T>(v: T | undefined | null): T {
   if (v === undefined || v === null) {
     throw new Error("missing value");