refactor(workspace): split workspace interface and implementation (#5463)

@affine/workspace -> (@affine/workspace, @affine/workspace-impl)

packages/frontend/workspace-impl/src/local/blob-sqlite.ts

@@ -0,0 +1,38 @@
+import { apis } from '@affine/electron-api';
+import type { BlobStorage } from '@affine/workspace';
+import { assertExists } from '@blocksuite/global/utils';
+
+import { bufferToBlob } from '../utils/buffer-to-blob';
+
+export const createSQLiteBlobStorage = (workspaceId: string): BlobStorage => {
+  assertExists(apis);
+  return {
+    name: 'sqlite',
+    readonly: false,
+    get: async (key: string) => {
+      assertExists(apis);
+      const buffer = await apis.db.getBlob(workspaceId, key);
+      if (buffer) {
+        return bufferToBlob(buffer);
+      }
+      return null;
+    },
+    set: async (key: string, value: Blob) => {
+      assertExists(apis);
+      await apis.db.addBlob(
+        workspaceId,
+        key,
+        new Uint8Array(await value.arrayBuffer())
+      );
+      return key;
+    },
+    delete: async (key: string) => {
+      assertExists(apis);
+      return apis.db.deleteBlob(workspaceId, key);
+    },
+    list: async () => {
+      assertExists(apis);
+      return apis.db.getBlobKeys(workspaceId);
+    },
+  };
+};