@memofs/adapter-r2

Cloudflare R2 blob adapter for MemoFS remote blob memory stores.

What is this?

Cloudflare R2 blob adapter for MemoFS's remote-blob memory store. It implements core's provider-neutral BlobClient contract over a Cloudflare R2 bucket binding so the MemoFS runtime can read/write its canonical .memofs/ files against R2 blobs — running the same runtime on hosted infra as on a local filesystem.

This package owns blob storage only. The matching metadata adapter (createTursoMetadataStore) lives in @memofs/adapter-turso. The two are intentionally decoupled — a provider-neutral adapter shape, not a bundled N×M adapter — so a Node self-hoster can pair this blob client with any MetadataStore, or pair a future @memofs/adapter-s3 blob client with the Turso metadata store, without touching the runtime.

Installation

npm install @memofs/adapter-r2

Requires Node.js >= 22.

Peer dependency: @cloudflare/workers-types (for the R2Bucket type). It is an optional peer — you only need it where you author against the binding.

Quick Start

import { RemoteBlobMemoryStore } from "@memofs/core";
import { createR2BlobClient } from "@memofs/adapter-r2";
import { createTursoMetadataStore } from "@memofs/adapter-turso";

const store = new RemoteBlobMemoryStore({
 blobClient: createR2BlobClient({ binding: env.BLOBS }),
 metadata: createTursoMetadataStore({ client: db.$client, projectId }),
 rootKey: projectId,
});

// The store implements MemoryStore — pass it to the runtime:
// createHostedRuntime({ store, projectId, ... })

API

createR2BlobClient(options)

Creates a BlobClient backed by a Cloudflare R2 bucket binding.

| Option | Type | Required | Description | |--------|------|----------|-------------| | binding | R2Bucket | Yes | The Cloudflare R2 bucket binding (env.BLOBS). |

Returns a BlobClient with get, put, and delete — the three methods core's RemoteBlobMemoryStore calls.

Content addressing

Blobs are written keyed by their sha256 — the key core's RemoteBlobMemoryStore computes. This matches the cloud file replica's r2_key === sha256 layout exactly, so the runtime and the sync handler share the same R2 objects rather than a parallel store. Identical content across paths or projects shares one blob.

Boundary

This package owns the Cloudflare R2 blob client implementation. It does not own the MemoFS core contracts (BlobClient / MetadataStore / RemoteBlobMemoryStore), the metadata adapter, other adapters, or the R2 service itself.

Contributing

See our central Contributing Guide and development scripts for details on formatting, linting, and testing within the monorepo.

License

MIT