From dd507e1dcd9b16414bc02a76fd419db11d2d6b09 Mon Sep 17 00:00:00 2001
From: jj <log@riseup.net>
Date: Wed, 30 Apr 2025 17:21:22 +0000
Subject: [PATCH] lib/storage: add abstract storage class

---
 web/src/lib/storage/opfs.ts    |  5 ++++-
 web/src/lib/storage/storage.ts | 15 +++++++++++++++
 2 files changed, 19 insertions(+), 1 deletion(-)
 create mode 100644 web/src/lib/storage/storage.ts

diff --git a/web/src/lib/storage/opfs.ts b/web/src/lib/storage/opfs.ts
index 092fc851..e038db30 100644
--- a/web/src/lib/storage/opfs.ts
+++ b/web/src/lib/storage/opfs.ts
@@ -1,11 +1,14 @@
+import { AbstractStorage } from "./storage";
+
 const COBALT_PROCESSING_DIR = "cobalt-processing-data";
 
-export class OPFSStorage {
+export class OPFSStorage extends AbstractStorage {
     #root;
     #handle;
     #io;
 
     constructor(root: FileSystemDirectoryHandle, handle: FileSystemFileHandle, reader: FileSystemSyncAccessHandle) {
+        super();
         this.#root = root;
         this.#handle = handle;
         this.#io = reader;
diff --git a/web/src/lib/storage/storage.ts b/web/src/lib/storage/storage.ts
new file mode 100644
index 00000000..d9d6381e
--- /dev/null
+++ b/web/src/lib/storage/storage.ts
@@ -0,0 +1,15 @@
+export abstract class AbstractStorage {
+    static init(): Promise<AbstractStorage> {
+        throw "init() call on abstract implementation";
+    }
+
+    static isAvailable(): boolean {
+        return false;
+    }
+
+    abstract res(): Promise<File>;
+    abstract read(size: number, offset: number): Uint8Array;
+    abstract write(data: Uint8Array | Int8Array, offset: number): Promise<number>;
+    abstract destroy(): Promise<void>;
+};
+