refactor: note list component

src/services/client.service.ts

@@ -27,6 +27,7 @@ import {
 } from 'nostr-tools'
 import { AbstractRelay } from 'nostr-tools/abstract-relay'
 import indexedDb from './indexed-db.service'
+import { isSafari } from '@/lib/utils'
 
 type TTimelineRef = [string, number]
 
@@ -1180,6 +1181,55 @@ class ClientService extends EventTarget {
   async updateBlossomServerListEventCache(evt: NEvent) {
     await this.updateReplaceableEventCache(evt)
   }
+
+  // ================= Utils =================
+
+  async generateSubRequestsForPubkeys(pubkeys: string[], myPubkey?: string | null) {
+    // If many websocket connections are initiated simultaneously, it will be
+    // very slow on Safari (for unknown reason)
+    if (isSafari()) {
+      let urls = BIG_RELAY_URLS
+      if (myPubkey) {
+        const relayList = await this.fetchRelayList(myPubkey)
+        urls = relayList.read.concat(BIG_RELAY_URLS).slice(0, 5)
+      }
+      return [{ urls, filter: { authors: pubkeys } }]
+    }
+
+    const relayLists = await this.fetchRelayLists(pubkeys)
+    const group: Record<string, Set<string>> = {}
+    relayLists.forEach((relayList, index) => {
+      relayList.write.slice(0, 4).forEach((url) => {
+        if (!group[url]) {
+          group[url] = new Set()
+        }
+        group[url].add(pubkeys[index])
+      })
+    })
+
+    const relayCount = Object.keys(group).length
+    const coveredCount = new Map<string, number>()
+    Object.entries(group)
+      .sort(([, a], [, b]) => b.size - a.size)
+      .forEach(([url, pubkeys]) => {
+        if (
+          relayCount > 10 &&
+          pubkeys.size < 10 &&
+          Array.from(pubkeys).every((pubkey) => (coveredCount.get(pubkey) ?? 0) >= 2)
+        ) {
+          delete group[url]
+        } else {
+          pubkeys.forEach((pubkey) => {
+            coveredCount.set(pubkey, (coveredCount.get(pubkey) ?? 0) + 1)
+          })
+        }
+      })
+
+    return Object.entries(group).map(([url, authors]) => ({
+      urls: [url],
+      filter: { authors: Array.from(authors) }
+    }))
+  }
 }
 
 const instance = ClientService.getInstance()