feat: cache post content

src/services/post-content-cache.service.ts

@@ -0,0 +1,32 @@
+import { Event } from 'nostr-tools'
+
+class PostContentCacheService {
+  static instance: PostContentCacheService
+
+  private cache: Map<string, string> = new Map()
+
+  constructor() {
+    if (!PostContentCacheService.instance) {
+      PostContentCacheService.instance = this
+    }
+    return PostContentCacheService.instance
+  }
+
+  get({ defaultContent, parentEvent }: { defaultContent?: string; parentEvent?: Event } = {}) {
+    return this.cache.get(this.generateCacheKey(defaultContent, parentEvent)) ?? defaultContent
+  }
+
+  set(
+    { defaultContent, parentEvent }: { defaultContent?: string; parentEvent?: Event },
+    content: string
+  ) {
+    this.cache.set(this.generateCacheKey(defaultContent, parentEvent), content)
+  }
+
+  generateCacheKey(defaultContent: string = '', parentEvent?: Event): string {
+    return parentEvent ? parentEvent.id : defaultContent
+  }
+}
+
+const instance = new PostContentCacheService()
+export default instance