move to pkg

packages/system/src/cache/index.ts

@@ -0,0 +1,68 @@
+import { HexKey, NostrEvent, UserMetadata } from "..";
+import { hexToBech32, unixNowMs } from "../Util";
+
+export interface MetadataCache extends UserMetadata {
+  /**
+   * When the object was saved in cache
+   */
+  loaded: number;
+
+  /**
+   * When the source metadata event was created
+   */
+  created: number;
+
+  /**
+   * The pubkey of the owner of this metadata
+   */
+  pubkey: HexKey;
+
+  /**
+   * The bech32 encoded pubkey
+   */
+  npub: string;
+
+  /**
+   * Pubkey of zapper service
+   */
+  zapService?: HexKey;
+
+  /**
+   * If the nip05 is valid for this user
+   */
+  isNostrAddressValid: boolean;
+}
+
+export function mapEventToProfile(ev: NostrEvent) {
+  try {
+    const data: UserMetadata = JSON.parse(ev.content);
+    return {
+      ...data,
+      pubkey: ev.pubkey,
+      npub: hexToBech32("npub", ev.pubkey),
+      created: ev.created_at,
+      loaded: unixNowMs(),
+    } as MetadataCache;
+  } catch (e) {
+    console.error("Failed to parse JSON", ev, e);
+  }
+}
+
+export interface CacheStore<T> {
+  preload(): Promise<void>;
+  getFromCache(key?: string): T | undefined;
+  get(key?: string): Promise<T | undefined>;
+  bulkGet(keys: Array<string>): Promise<Array<T>>;
+  set(obj: T): Promise<void>;
+  bulkSet(obj: Array<T>): Promise<void>;
+  update<TCachedWithCreated extends T & { created: number; loaded: number }>(m: TCachedWithCreated): Promise<"new" | "updated" | "refresh" | "no_change">
+
+  /**
+   * Loads a list of rows from disk cache
+   * @param keys List of ids to load
+   * @returns Keys that do not exist on disk cache
+   */
+  buffer(keys: Array<string>): Promise<Array<string>>;
+
+  clear(): Promise<void>;
+}