perf: use batch fetch for profile refresh

Replaces the sequential loop in `forceRefreshAllProfiles` with `batchFetchProfiles` to reduce network requests.
Updates `batchFetchProfilesFromRelays` to support `forceRefresh`, ensuring fresh data is requested while maintaining optimistic UI updates.
Adds unit tests for `forceRefresh` behavior.

Co-authored-by: PR0M3TH3AN <[email protected]>

js/app.js

@@ -718,9 +718,7 @@ class Application {
     const uniqueAuthors = new Set(activeVideos.map((v) => v.pubkey));
 
     // 3) For each author, fetchAndRenderProfile with forceRefresh = true
-    for (const authorPubkey of uniqueAuthors) {
-      this.authService.fetchAndRenderProfile(authorPubkey, true);
-    }
+    this.batchFetchProfiles(uniqueAuthors, { forceRefresh: true });
   }
 
   getCurrentUserNpub() {
@@ -2661,9 +2659,10 @@ class Application {
     return this.authService.fetchAndRenderProfile(pubkey, forceRefresh);
   }
 
-  async batchFetchProfiles(authorSet) {
+  async batchFetchProfiles(authorSet, { forceRefresh = false } = {}) {
     return batchFetchProfilesFromRelays({
       authorSet,
+      forceRefresh,
       getProfileCacheEntry: (pubkey) => this.getProfileCacheEntry(pubkey),
       setProfileCacheEntry: (pubkey, profile) =>
         this.setProfileCacheEntry(pubkey, profile),

js/utils/profileBatchFetcher.js

@@ -10,6 +10,7 @@ const DEFAULT_PROFILE_IMAGE = "assets/svg/default-profile.svg";
 
 export async function batchFetchProfilesFromRelays({
   authorSet,
+  forceRefresh = false,
   getProfileCacheEntry,
   setProfileCacheEntry,
   updateProfileInDOM,
@@ -50,6 +51,9 @@ export async function batchFetchProfilesFromRelays({
     const cacheEntry = getProfileCacheEntry(normalizedPubkey);
     if (cacheEntry) {
       updateProfileInDOM(normalizedPubkey, cacheEntry.profile);
+      if (forceRefresh) {
+        toFetch.push(normalizedPubkey);
+      }
     } else {
       toFetch.push(normalizedPubkey);
     }

tests/app-batch-fetch-profiles.test.mjs

@@ -133,3 +133,79 @@ test("batchFetchProfiles handles fast and failing relays", async () => {
     { pubkey: VALID_PUBKEY, profile: { name: "Fast", picture: "fast.png" } },
   ]);
 });
+
+test("batchFetchProfiles respects forceRefresh", async () => {
+  const cache = new Map();
+  const updates = [];
+  const setCalls = [];
+  const authorSet = new Set([
+    CACHED_PUBKEY,
+  ]);
+
+  const getProfileCacheEntry = (pubkey) => {
+    if (pubkey === CACHED_PUBKEY) {
+      return { profile: { name: "Cached", picture: "cached.png" } };
+    }
+    return null;
+  };
+
+  const setProfileCacheEntry = (pubkey, profile) => {
+    cache.set(pubkey, { profile });
+    setCalls.push({ pubkey, profile });
+  };
+
+  const updateProfileInDOM = (pubkey, profile) => {
+    updates.push({ pubkey, profile });
+  };
+
+  const originalPool = nostrClient.pool;
+  const poolListCalls = [];
+
+  nostrClient.pool = {
+    list: (relays, filters) => {
+      poolListCalls.push({ relays, filters });
+      return Promise.resolve([
+        createProfileEvent({
+          pubkey: CACHED_PUBKEY,
+          createdAt: 300,
+          content: { name: "Refreshed", picture: "refreshed.png" },
+        }),
+      ]);
+    },
+  };
+
+  try {
+    await batchFetchProfilesFromRelays({
+      authorSet,
+      forceRefresh: true,
+      getProfileCacheEntry,
+      setProfileCacheEntry,
+      updateProfileInDOM,
+    });
+  } finally {
+    nostrClient.pool = originalPool;
+  }
+
+  // Should fetch despite cache presence
+  assert.ok(poolListCalls.length > 0, "should query relays when forceRefresh is true");
+  assert.deepEqual(
+    poolListCalls[0].filters[0].authors,
+    [CACHED_PUBKEY],
+    "should include cached pubkey in fetch list"
+  );
+
+  // Should still optimistic update from cache first
+  assert.deepEqual(
+    updates[0],
+    { pubkey: CACHED_PUBKEY, profile: { name: "Cached", picture: "cached.png" } },
+    "cached profiles should hydrate immediately even with forceRefresh"
+  );
+
+  // Then update with fresh data
+  const lastUpdate = updates[updates.length - 1];
+  assert.deepEqual(
+    lastUpdate,
+    { pubkey: CACHED_PUBKEY, profile: { name: "Refreshed", picture: "refreshed.png" } },
+    "should update with refreshed data"
+  );
+});