new notifications design

packages/app/src/Cache/Notifications.ts

@@ -0,0 +1,39 @@
+import { EventKind, NostrEvent, RequestBuilder, TaggedRawEvent } from "@snort/system";
+import { RefreshFeedCache, TWithCreated } from "./RefreshFeedCache";
+import { LoginSession } from "Login";
+import { unixNow } from "SnortUtils";
+import { db } from "Db";
+
+export class NotificationsCache extends RefreshFeedCache<NostrEvent> {
+  #kinds = [EventKind.TextNote, EventKind.Reaction, EventKind.Repost, EventKind.ZapReceipt];
+
+  constructor() {
+    super("notifications", db.notifications);
+  }
+
+  buildSub(session: LoginSession, rb: RequestBuilder) {
+    if (session.publicKey) {
+      const newest = this.newest();
+      rb.withFilter()
+        .kinds(this.#kinds)
+        .tag("p", [session.publicKey])
+        .since(newest === 0 ? unixNow() - 60 * 60 * 24 * 30 : newest);
+    }
+  }
+
+  async onEvent(evs: readonly TaggedRawEvent[]) {
+    const filtered = evs.filter(a => this.#kinds.includes(a.kind) && a.tags.some(b => b[0] === "p"));
+    if (filtered.length > 0) {
+      await this.bulkSet(filtered);
+      this.notifyChange(filtered.map(v => this.key(v)));
+    }
+  }
+
+  key(of: TWithCreated<NostrEvent>): string {
+    return of.id;
+  }
+
+  takeSnapshot(): TWithCreated<NostrEvent>[] {
+    return [...this.cache.values()];
+  }
+}