dm cache

packages/app/src/Cache/DMCache.ts

@@ -0,0 +1,36 @@
+import { RawEvent } from "@snort/nostr";
+import { db } from "Db";
+import { dedupe } from "Util";
+import FeedCache from "./FeedCache";
+
+class DMCache extends FeedCache<RawEvent> {
+  constructor() {
+    super("DMCache", db.dms);
+  }
+
+  key(of: RawEvent): string {
+    return of.id;
+  }
+
+  override async preload(): Promise<void> {
+    await super.preload();
+    // load all dms to memory
+    await this.buffer([...this.onTable]);
+  }
+
+  newest(): number {
+    let ret = 0;
+    this.cache.forEach(v => (ret = v.created_at > ret ? v.created_at : ret));
+    return ret;
+  }
+
+  allDms(): Array<RawEvent> {
+    return [...this.cache.values()];
+  }
+
+  takeSnapshot(): Array<RawEvent> {
+    return this.allDms();
+  }
+}
+
+export const DmCache = new DMCache();