From 1e6e37f5e532b4506d30ff1130234a8ebfbde9fc Mon Sep 17 00:00:00 2001
From: codytseng <codytseng98@gmail.com>
Date: Sun, 6 Apr 2025 00:34:32 +0800
Subject: [PATCH] feat: following's favoriate relays

---
 .../FollowingFavoriteRelayList/index.tsx      | 96 +++++++++++++++++++
 src/components/RelayList/index.tsx            | 22 +----
 src/components/RelaySimpleInfo/index.tsx      | 40 +++++++-
 src/i18n/locales/ar.ts                        |  5 +-
 src/i18n/locales/de.ts                        |  5 +-
 src/i18n/locales/en.ts                        |  5 +-
 src/i18n/locales/es.ts                        |  5 +-
 src/i18n/locales/fr.ts                        |  5 +-
 src/i18n/locales/it.ts                        |  5 +-
 src/i18n/locales/ja.ts                        |  5 +-
 src/i18n/locales/pl.ts                        |  5 +-
 src/i18n/locales/pt-BR.ts                     |  5 +-
 src/i18n/locales/pt-PT.ts                     |  5 +-
 src/i18n/locales/ru.ts                        |  5 +-
 src/i18n/locales/zh.ts                        |  5 +-
 src/pages/primary/ExplorePage/index.tsx       | 52 +++++++++-
 src/services/client.service.ts                | 44 ++++++++-
 src/services/relay-info.service.ts            |  3 +
 18 files changed, 280 insertions(+), 37 deletions(-)
 create mode 100644 src/components/FollowingFavoriteRelayList/index.tsx

diff --git a/src/components/FollowingFavoriteRelayList/index.tsx b/src/components/FollowingFavoriteRelayList/index.tsx
new file mode 100644
index 00000000..30b8f620
--- /dev/null
+++ b/src/components/FollowingFavoriteRelayList/index.tsx
@@ -0,0 +1,96 @@
+import { toRelay } from '@/lib/link'
+import { useSecondaryPage } from '@/PageManager'
+import { useNostr } from '@/providers/NostrProvider'
+import client from '@/services/client.service'
+import relayInfoService from '@/services/relay-info.service'
+import { TNip66RelayInfo } from '@/types'
+import { useEffect, useRef, useState } from 'react'
+import { useTranslation } from 'react-i18next'
+import RelaySimpleInfo, { RelaySimpleInfoSkeleton } from '../RelaySimpleInfo'
+
+const SHOW_COUNT = 10
+
+export default function FollowingFavoriteRelayList() {
+  const { t } = useTranslation()
+  const { push } = useSecondaryPage()
+  const { pubkey } = useNostr()
+  const [loading, setLoading] = useState(true)
+  const [relays, setRelays] = useState<(TNip66RelayInfo & { users: string[] })[]>([])
+  const [showCount, setShowCount] = useState(SHOW_COUNT)
+  const bottomRef = useRef<HTMLDivElement>(null)
+
+  useEffect(() => {
+    setLoading(true)
+
+    const init = async () => {
+      if (!pubkey) return
+
+      const relayMap =
+        (await client.fetchFollowingFavoriteRelays(pubkey)) ?? new Map<string, Set<string>>()
+      const relayUrls = Array.from(relayMap.keys())
+      const relayInfos = await relayInfoService.getRelayInfos(relayUrls ?? [])
+      setRelays(
+        (relayInfos.filter(Boolean) as TNip66RelayInfo[])
+          .map((relayInfo) => {
+            const users = Array.from(relayMap.get(relayInfo.url) ?? [])
+            return {
+              ...relayInfo,
+              users
+            }
+          })
+          .sort((a, b) => b.users.length - a.users.length)
+      )
+    }
+    init().finally(() => {
+      setLoading(false)
+    })
+  }, [pubkey])
+
+  useEffect(() => {
+    const options = {
+      root: null,
+      rootMargin: '10px',
+      threshold: 1
+    }
+
+    const observerInstance = new IntersectionObserver((entries) => {
+      if (entries[0].isIntersecting && showCount < relays.length) {
+        setShowCount((prev) => prev + SHOW_COUNT)
+      }
+    }, options)
+
+    const currentBottomRef = bottomRef.current
+    if (currentBottomRef) {
+      observerInstance.observe(currentBottomRef)
+    }
+
+    return () => {
+      if (observerInstance && currentBottomRef) {
+        observerInstance.unobserve(currentBottomRef)
+      }
+    }
+  }, [showCount, relays])
+
+  return (
+    <div>
+      {relays.slice(0, showCount).map((relay) => (
+        <RelaySimpleInfo
+          key={relay.url}
+          relayInfo={relay}
+          className="clickable p-4 border-b"
+          onClick={(e) => {
+            e.stopPropagation()
+            push(toRelay(relay.url))
+          }}
+        />
+      ))}
+      {showCount < relays.length && <div ref={bottomRef} />}
+      {loading && <RelaySimpleInfoSkeleton />}
+      {!loading && (
+        <div className="text-center text-muted-foreground text-sm mt-2">
+          {relays.length === 0 ? t('no relays found') : t('no more relays')}
+        </div>
+      )}
+    </div>
+  )
+}
diff --git a/src/components/RelayList/index.tsx b/src/components/RelayList/index.tsx
index f22b930e..6bf9b219 100644
--- a/src/components/RelayList/index.tsx
+++ b/src/components/RelayList/index.tsx
@@ -1,11 +1,10 @@
-import { Skeleton } from '@/components/ui/skeleton'
 import { toRelay } from '@/lib/link'
 import { useSecondaryPage } from '@/PageManager'
 import relayInfoService from '@/services/relay-info.service'
 import { TNip66RelayInfo } from '@/types'
 import { useEffect, useRef, useState } from 'react'
 import { useTranslation } from 'react-i18next'
-import RelaySimpleInfo from '../RelaySimpleInfo'
+import RelaySimpleInfo, { RelaySimpleInfoSkeleton } from '../RelaySimpleInfo'
 import SearchInput from '../SearchInput'
 
 export default function RelayList() {
@@ -69,7 +68,7 @@ export default function RelayList() {
 
   return (
     <div>
-      <div className="px-4 py-2 sticky top-12 bg-background z-30">
+      <div className="px-4 py-2">
         <SearchInput placeholder={t('Search relays')} value={input} onChange={handleInputChange} />
       </div>
       {relays.slice(0, showCount).map((relay) => (
@@ -84,22 +83,7 @@ export default function RelayList() {
         />
       ))}
       {showCount < relays.length && <div ref={bottomRef} />}
-      {loading && (
-        <div className="p-4 space-y-2">
-          <div className="flex items-start justify-between gap-2 w-full">
-            <div className="flex flex-1 w-0 items-center gap-2">
-              <Skeleton className="h-9 w-9 rounded-full" />
-              <div className="flex-1 w-0 space-y-1">
-                <Skeleton className="w-40 h-5" />
-                <Skeleton className="w-20 h-4" />
-              </div>
-            </div>
-            <Skeleton className="w-5 h-5 rounded-lg" />
-          </div>
-          <Skeleton className="w-full h-4" />
-          <Skeleton className="w-2/3 h-4" />
-        </div>
-      )}
+      {loading && <RelaySimpleInfoSkeleton />}
       {!loading && relays.length === 0 && (
         <div className="text-center text-muted-foreground text-sm">{t('no relays found')}</div>
       )}
diff --git a/src/components/RelaySimpleInfo/index.tsx b/src/components/RelaySimpleInfo/index.tsx
index dfb300a6..3e30d368 100644
--- a/src/components/RelaySimpleInfo/index.tsx
+++ b/src/components/RelaySimpleInfo/index.tsx
@@ -1,9 +1,12 @@
+import { Skeleton } from '@/components/ui/skeleton'
 import { cn } from '@/lib/utils'
 import { TNip66RelayInfo } from '@/types'
+import { HTMLProps } from 'react'
+import { useTranslation } from 'react-i18next'
 import RelayBadges from '../RelayBadges'
 import RelayIcon from '../RelayIcon'
 import SaveRelayDropdownMenu from '../SaveRelayDropdownMenu'
-import { HTMLProps } from 'react'
+import { SimpleUserAvatar } from '../UserAvatar'
 
 export default function RelaySimpleInfo({
   relayInfo,
@@ -11,9 +14,11 @@ export default function RelaySimpleInfo({
   className,
   ...props
 }: HTMLProps<HTMLDivElement> & {
-  relayInfo?: TNip66RelayInfo
+  relayInfo?: TNip66RelayInfo & { users?: string[] }
   hideBadge?: boolean
 }) {
+  const { t } = useTranslation()
+
   return (
     <div className={cn('space-y-1', className)} {...props}>
       <div className="flex items-start justify-between gap-2 w-full">
@@ -30,6 +35,37 @@ export default function RelaySimpleInfo({
       </div>
       {!hideBadge && relayInfo && <RelayBadges relayInfo={relayInfo} />}
       {!!relayInfo?.description && <div className="line-clamp-4">{relayInfo.description}</div>}
+      {!!relayInfo?.users?.length && (
+        <div className="flex items-center gap-2">
+          <div className="text-muted-foreground">{t('Favorited by')} </div>
+          <div className="flex items-center gap-1">
+            {relayInfo.users.slice(0, 10).map((user) => (
+              <SimpleUserAvatar key={user} userId={user} size="xSmall" />
+            ))}
+            {relayInfo.users.length > 10 && (
+              <div className="text-muted-foreground text-xs rounded-full bg-muted w-5 h-5 flex items-center justify-center">
+                +{relayInfo.users.length - 10}
+              </div>
+            )}
+          </div>
+        </div>
+      )}
+    </div>
+  )
+}
+
+export function RelaySimpleInfoSkeleton() {
+  return (
+    <div className="p-4 space-y-2">
+      <div className="flex items-center gap-2 w-full">
+        <Skeleton className="h-9 w-9 rounded-full" />
+        <div className="flex-1 w-0 space-y-1">
+          <Skeleton className="w-40 h-5" />
+          <Skeleton className="w-20 h-4" />
+        </div>
+      </div>
+      <Skeleton className="w-full h-4" />
+      <Skeleton className="w-2/3 h-4" />
     </div>
   )
 }
diff --git a/src/i18n/locales/ar.ts b/src/i18n/locales/ar.ts
index aeb4fd1b..d06db8ee 100644
--- a/src/i18n/locales/ar.ts
+++ b/src/i18n/locales/ar.ts
@@ -203,6 +203,9 @@ export default {
     'Not found the note': 'لم يتم العثور على الملاحظة',
     'no more replies': 'لا توجد مزيد من الردود',
     'Relay sets': 'مجموعات الريلاي',
-    'Favorite Relays': 'الريلايات المفضلة'
+    'Favorite Relays': 'الريلايات المفضلة',
+    "Following's Favorites": 'المفضلات من المتابعين',
+    'no more relays': 'لا توجد مزيد من الريلايات',
+    'Favorited by': 'المفضلة من قبل'
   }
 }
diff --git a/src/i18n/locales/de.ts b/src/i18n/locales/de.ts
index d225a782..bb2e0827 100644
--- a/src/i18n/locales/de.ts
+++ b/src/i18n/locales/de.ts
@@ -207,6 +207,9 @@ export default {
     'Not found the note': 'Die Notiz wurde nicht gefunden',
     'no more replies': 'keine weiteren Antworten',
     'Relay sets': 'Relay-Sets',
-    'Favorite Relays': 'Lieblings-Relays'
+    'Favorite Relays': 'Lieblings-Relays',
+    "Following's Favorites": 'Favoriten der Folgenden',
+    'no more relays': 'keine weiteren Relays',
+    'Favorited by': 'Favorisiert von'
   }
 }
diff --git a/src/i18n/locales/en.ts b/src/i18n/locales/en.ts
index 62c0f5bb..f3b92e8e 100644
--- a/src/i18n/locales/en.ts
+++ b/src/i18n/locales/en.ts
@@ -203,6 +203,9 @@ export default {
     'Not found the note': 'Not found the note',
     'no more replies': 'no more replies',
     'Relay sets': 'Relay sets',
-    'Favorite Relays': 'Favorite Relays'
+    'Favorite Relays': 'Favorite Relays',
+    "Following's Favorites": "Following's Favorites",
+    'no more relays': 'no more relays',
+    'Favorited by': 'Favorited by'
   }
 }
diff --git a/src/i18n/locales/es.ts b/src/i18n/locales/es.ts
index 001ed97b..ecd3fafe 100644
--- a/src/i18n/locales/es.ts
+++ b/src/i18n/locales/es.ts
@@ -206,6 +206,9 @@ export default {
     'Not found the note': 'No se encontró la nota',
     'no more replies': 'no hay más respuestas',
     'Relay sets': 'Conjuntos de relés',
-    'Favorite Relays': 'Relés favoritos'
+    'Favorite Relays': 'Relés favoritos',
+    "Following's Favorites": 'Favoritos de los seguidos',
+    'no more relays': 'no hay más relés',
+    'Favorited by': 'Favoritado por'
   }
 }
diff --git a/src/i18n/locales/fr.ts b/src/i18n/locales/fr.ts
index 1b9635f1..da4e65c3 100644
--- a/src/i18n/locales/fr.ts
+++ b/src/i18n/locales/fr.ts
@@ -206,6 +206,9 @@ export default {
     'Not found the note': 'Note introuvable',
     'no more replies': 'aucune autre réponse',
     'Relay sets': 'Groupes de relais',
-    'Favorite Relays': 'Relais favoris'
+    'Favorite Relays': 'Relais favoris',
+    "Following's Favorites": "Following's Favorites",
+    'no more relays': 'aucun autre relais',
+    'Favorited by': 'Favorisé par'
   }
 }
diff --git a/src/i18n/locales/it.ts b/src/i18n/locales/it.ts
index 733a78bf..d92299ff 100644
--- a/src/i18n/locales/it.ts
+++ b/src/i18n/locales/it.ts
@@ -206,6 +206,9 @@ export default {
     'Not found the note': 'Non è stata trovata la nota',
     'no more replies': 'niente più repliche',
     'Relay sets': 'Set di Relay',
-    'Favorite Relays': 'Relay preferiti'
+    'Favorite Relays': 'Relay preferiti',
+    "Following's Favorites": 'Preferiti dei seguiti',
+    'no more relays': 'niente più relay',
+    'Favorited by': 'Preferito da'
   }
 }
diff --git a/src/i18n/locales/ja.ts b/src/i18n/locales/ja.ts
index b4cd7997..f439b7e4 100644
--- a/src/i18n/locales/ja.ts
+++ b/src/i18n/locales/ja.ts
@@ -204,6 +204,9 @@ export default {
     'Not found the note': 'ノートが見つかりません',
     'no more replies': 'これ以上の返信はありません',
     'Relay sets': 'リレイセット',
-    'Favorite Relays': 'お気に入りのリレイ'
+    'Favorite Relays': 'お気に入りのリレイ',
+    "Following's Favorites": 'フォロー中のお気に入り',
+    'no more relays': 'これ以上のリレイはありません',
+    'Favorited by': 'お気に入り'
   }
 }
diff --git a/src/i18n/locales/pl.ts b/src/i18n/locales/pl.ts
index e597e395..2f1244a7 100644
--- a/src/i18n/locales/pl.ts
+++ b/src/i18n/locales/pl.ts
@@ -205,6 +205,9 @@ export default {
     'Not found the note': 'Nie znaleziono wpisu',
     'no more replies': 'brak kolejnych odpowiedzi',
     'Relay sets': 'Zestawy transmiterów',
-    'Favorite Relays': 'Ulubione transmitery'
+    'Favorite Relays': 'Ulubione transmitery',
+    "Following's Favorites": 'Ulubione transmitery obserwowanych',
+    'no more relays': 'brak kolejnych transmiterów',
+    'Favorited by': 'Ulubione przez'
   }
 }
diff --git a/src/i18n/locales/pt-BR.ts b/src/i18n/locales/pt-BR.ts
index 21d5acca..114be3b8 100644
--- a/src/i18n/locales/pt-BR.ts
+++ b/src/i18n/locales/pt-BR.ts
@@ -205,6 +205,9 @@ export default {
     'Not found the note': 'Nota não encontrada',
     'no more replies': 'não há mais respostas',
     'Relay sets': 'Conjuntos de relé',
-    'Favorite Relays': 'Relés favoritos'
+    'Favorite Relays': 'Relés favoritos',
+    "Following's Favorites": 'Favoritos de quem você segue',
+    'no more relays': 'não há mais relés',
+    'Favorited by': 'Favoritado por'
   }
 }
diff --git a/src/i18n/locales/pt-PT.ts b/src/i18n/locales/pt-PT.ts
index 2b70ff21..f03bed69 100644
--- a/src/i18n/locales/pt-PT.ts
+++ b/src/i18n/locales/pt-PT.ts
@@ -206,6 +206,9 @@ export default {
     'Not found the note': 'Nota não encontrada',
     'no more replies': 'não há mais respostas',
     'Relay sets': 'Conjuntos de Relé',
-    'Favorite Relays': 'Relés Favoritos'
+    'Favorite Relays': 'Relés Favoritos',
+    "Following's Favorites": 'Favoritos de quem você segue',
+    'no more relays': 'não há mais relés',
+    'Favorited by': 'Favoritado por'
   }
 }
diff --git a/src/i18n/locales/ru.ts b/src/i18n/locales/ru.ts
index be42dff8..6c309ce5 100644
--- a/src/i18n/locales/ru.ts
+++ b/src/i18n/locales/ru.ts
@@ -207,6 +207,9 @@ export default {
     'Not found the note': 'Заметка не найдена',
     'no more replies': 'больше нет ответов',
     'Relay sets': 'Наборы ретрансляторов',
-    'Favorite Relays': 'Избранные ретрансляторы'
+    'Favorite Relays': 'Избранные ретрансляторы',
+    "Following's Favorites": 'Избранные ретрансляторы подписчиков',
+    'no more relays': 'больше нет ретрансляторов',
+    'Favorited by': 'Избранные у'
   }
 }
diff --git a/src/i18n/locales/zh.ts b/src/i18n/locales/zh.ts
index 4a03450e..b603f279 100644
--- a/src/i18n/locales/zh.ts
+++ b/src/i18n/locales/zh.ts
@@ -204,6 +204,9 @@ export default {
     'Not found the note': '未找到该笔记',
     'no more replies': '没有更多回复了',
     'Relay sets': '服务器组',
-    'Favorite Relays': '收藏的服务器'
+    'Favorite Relays': '收藏的服务器',
+    "Following's Favorites": '关注人的收藏',
+    'no more relays': '没有更多服务器了',
+    'Favorited by': '收藏自'
   }
 }
diff --git a/src/pages/primary/ExplorePage/index.tsx b/src/pages/primary/ExplorePage/index.tsx
index 21f86740..fd0f677b 100644
--- a/src/pages/primary/ExplorePage/index.tsx
+++ b/src/pages/primary/ExplorePage/index.tsx
@@ -1,10 +1,17 @@
+import FollowingFavoriteRelayList from '@/components/FollowingFavoriteRelayList'
 import RelayList from '@/components/RelayList'
 import PrimaryPageLayout from '@/layouts/PrimaryPageLayout'
+import { cn } from '@/lib/utils'
+import { useDeepBrowsing } from '@/providers/DeepBrowsingProvider'
 import { Compass } from 'lucide-react'
-import { forwardRef } from 'react'
+import { forwardRef, useState } from 'react'
 import { useTranslation } from 'react-i18next'
 
+type TExploreTabs = 'following' | 'all'
+
 const ExplorePage = forwardRef((_, ref) => {
+  const [tab, setTab] = useState<TExploreTabs>('following')
+
   return (
     <PrimaryPageLayout
       ref={ref}
@@ -12,7 +19,8 @@ const ExplorePage = forwardRef((_, ref) => {
       titlebar={<ExplorePageTitlebar />}
       displayScrollToTopButton
     >
-      <RelayList />
+      <Tabs value={tab} setValue={setTab} />
+      {tab === 'following' ? <FollowingFavoriteRelayList /> : <RelayList />}
     </PrimaryPageLayout>
   )
 })
@@ -29,3 +37,43 @@ function ExplorePageTitlebar() {
     </div>
   )
 }
+
+function Tabs({
+  value,
+  setValue
+}: {
+  value: TExploreTabs
+  setValue: (value: TExploreTabs) => void
+}) {
+  const { t } = useTranslation()
+  const { deepBrowsing, lastScrollTop } = useDeepBrowsing()
+
+  return (
+    <div
+      className={cn(
+        'sticky top-12 bg-background z-30 duration-700 transition-transform select-none',
+        deepBrowsing && lastScrollTop > 800 ? '-translate-y-[calc(100%+12rem)]' : ''
+      )}
+    >
+      <div className="flex">
+        <div
+          className={`w-1/2 text-center py-2 font-semibold clickable cursor-pointer rounded-lg ${value === 'following' ? '' : 'text-muted-foreground'}`}
+          onClick={() => setValue('following')}
+        >
+          {t("Following's Favorites")}
+        </div>
+        <div
+          className={`w-1/2 text-center py-2 font-semibold clickable cursor-pointer rounded-lg ${value === 'all' ? '' : 'text-muted-foreground'}`}
+          onClick={() => setValue('all')}
+        >
+          {t('All')}
+        </div>
+      </div>
+      <div
+        className={`w-1/2 px-4 sm:px-6 transition-transform duration-500 ${value === 'all' ? 'translate-x-full' : ''}`}
+      >
+        <div className="w-full h-1 bg-primary rounded-full" />
+      </div>
+    </div>
+  )
+}
diff --git a/src/services/client.service.ts b/src/services/client.service.ts
index 228f31e6..f88db35b 100644
--- a/src/services/client.service.ts
+++ b/src/services/client.service.ts
@@ -1,8 +1,8 @@
-import { BIG_RELAY_URLS } from '@/constants'
+import { BIG_RELAY_URLS, ExtendedKind } from '@/constants'
 import { getProfileFromProfileEvent, getRelayListFromRelayListEvent } from '@/lib/event'
 import { formatPubkey, userIdToPubkey } from '@/lib/pubkey'
 import { extractPubkeysFromEventTags } from '@/lib/tag'
-import { isLocalNetworkUrl } from '@/lib/url'
+import { isLocalNetworkUrl, isWebsocketUrl, normalizeUrl } from '@/lib/url'
 import { isSafari } from '@/lib/utils'
 import { ISigner, TProfile, TRelayList } from '@/types'
 import { sha256 } from '@noble/hashes/sha2'
@@ -67,6 +67,13 @@ class ClientService extends EventTarget {
     max: 2000,
     fetchMethod: this._fetchFollowListEvent.bind(this)
   })
+  private fetchFollowingFavoriteRelaysCache = new LRUCache<
+    string,
+    Promise<Map<string, Set<string>>>
+  >({
+    max: 10,
+    fetchMethod: this._fetchFollowingFavoriteRelays.bind(this)
+  })
 
   private userIndex = new FlexSearch.Index({
     tokenize: 'forward'
@@ -822,6 +829,39 @@ class ClientService extends EventTarget {
     return followListEvent ? extractPubkeysFromEventTags(followListEvent.tags) : []
   }
 
+  async fetchFollowingFavoriteRelays(pubkey: string) {
+    return this.fetchFollowingFavoriteRelaysCache.fetch(pubkey)
+  }
+
+  private async _fetchFollowingFavoriteRelays(pubkey: string) {
+    const followings = await this.fetchFollowings(pubkey)
+    const favoriteRelaysEvents = await this.fetchEvents(BIG_RELAY_URLS, {
+      authors: followings,
+      kinds: [ExtendedKind.FAVORITE_RELAYS],
+      limit: followings.length
+    })
+    const alreadyExistsPubkeys = new Set<string>()
+    const uniqueEvents: NEvent[] = []
+    favoriteRelaysEvents
+      .sort((a, b) => b.created_at - a.created_at)
+      .forEach((event) => {
+        if (alreadyExistsPubkeys.has(event.pubkey)) return
+        alreadyExistsPubkeys.add(event.pubkey)
+        uniqueEvents.push(event)
+      })
+
+    const relayMap = new Map<string, Set<string>>()
+    uniqueEvents.forEach((event) => {
+      event.tags.forEach(([tagName, tagValue]) => {
+        if (tagName === 'relay' && tagValue && isWebsocketUrl(tagValue)) {
+          const url = normalizeUrl(tagValue)
+          relayMap.set(url, (relayMap.get(url) || new Set()).add(event.pubkey))
+        }
+      })
+    })
+    return relayMap
+  }
+
   updateFollowListCache(event: NEvent) {
     this.followListCache.set(event.pubkey, Promise.resolve(event))
   }
diff --git a/src/services/relay-info.service.ts b/src/services/relay-info.service.ts
index 59f49804..217e8ced 100644
--- a/src/services/relay-info.service.ts
+++ b/src/services/relay-info.service.ts
@@ -66,6 +66,9 @@ class RelayInfoService {
   }
 
   async getRelayInfos(urls: string[]) {
+    if (urls.length === 0) {
+      return []
+    }
     const relayInfos = await this.fetchDataloader.loadMany(urls)
     return relayInfos.map((relayInfo) => (relayInfo instanceof Error ? undefined : relayInfo))
   }