kubo/docs/examples/library-experimental-features/README.md

Use go-ipfs as a library and enable experimental features

Before moving on to this tutorial, you must read first the initial go-ipfs as a library tutorial as it gives insights on how to create a repository, the daemon and add a file.

There is only one thing that differs from this example and the first tutorial, which is the function createTempRepo:

func createTempRepo(ctx context.Context) (string, error) {
	repoPath, err := ioutil.TempDir("", "ipfs-shell")
	if err != nil {
		return "", fmt.Errorf("failed to get temp dir: %s", err)
	}

	// Create a config with default options and a 2048 bit key
	cfg, err := config.Init(ioutil.Discard, 2048)
	if err != nil {
		return "", err
	}

	// Create the repo with the config
	err = fsrepo.Init(repoPath, cfg)
	if err != nil {
		return "", fmt.Errorf("failed to init ephemeral node: %s", err)
	}

	return repoPath, nil
}

When creating the repository, you can define custom settings on the repository, such as enabling experimental features or customizing the gateway endpoint.

To do such things, you should modify the variable cfg. For example, to enable the sharding experiment, you would modify the function to:

func createTempRepo(ctx context.Context) (string, error) {
	repoPath, err := ioutil.TempDir("", "ipfs-shell")
	if err != nil {
		return "", fmt.Errorf("failed to get temp dir: %s", err)
	}

	// Create a config with default options and a 2048 bit key
	cfg, err := config.Init(ioutil.Discard, 2048)
	if err != nil {
		return "", err
	}
	
	// https://github.com/ipfs/go-ipfs/blob/master/docs/experimental-features.md#ipfs-filestore
	cfg.Experimental.FilestoreEnabled = true
	// https://github.com/ipfs/go-ipfs/blob/master/docs/experimental-features.md#ipfs-urlstore
	cfg.Experimental.UrlstoreEnabled = true
	// https://github.com/ipfs/go-ipfs/blob/master/docs/experimental-features.md#directory-sharding--hamt
	cfg.Experimental.ShardingEnabled = true
	// https://github.com/ipfs/go-ipfs/blob/master/docs/experimental-features.md#ipfs-p2p
	cfg.Experimental.Libp2pStreamMounting = true
	// https://github.com/ipfs/go-ipfs/blob/master/docs/experimental-features.md#p2p-http-proxy
	cfg.Experimental.P2pHttpProxy = true
	// https://github.com/ipfs/go-ipfs/blob/master/docs/experimental-features.md#quic
	cfg.Experimental.QUIC = true
	// https://github.com/ipfs/go-ipfs/blob/master/docs/experimental-features.md#strategic-providing
	cfg.Experimental.StrategicProviding = true

	// Create the repo with the config
	err = fsrepo.Init(repoPath, cfg)
	if err != nil {
		return "", fmt.Errorf("failed to init ephemeral node: %s", err)
	}

	return repoPath, nil
}

There are many other options that you can find through the documentation.