func (pn *peernet) Adapter(p testutil.Identity) bsnet.BitSwapNetwork {
	client, err := pn.Mocknet.AddPeer(p.PrivateKey(), p.Address())
	if err != nil {
		panic(err.Error())
	}
	routing := pn.routingserver.ClientWithDatastore(context.TODO(), p, ds.NewMapDatastore())
	return bsnet.NewFromIpfsHost(client, routing)
}

func (n *network) Adapter(p testutil.Identity) bsnet.BitSwapNetwork {
	client := &networkClient{
		local:   p.ID(),
		network: n,
		routing: n.routingserver.Client(p),
	}
	n.clients[p.ID()] = client
	return client
}

func (rs *mocknetserver) ClientWithDatastore(ctx context.Context, p testutil.Identity, ds ds.Datastore) Client {

	// FIXME AddPeer doesn't appear to be idempotent

	host, err := rs.mn.AddPeer(p.PrivateKey(), p.Address())
	if err != nil {
		panic("FIXME")
	}
	return dht.NewDHT(ctx, host, sync.MutexWrap(ds))
}

// session creates a test bitswap session.
//
// NB: It's easy make mistakes by providing the same peer ID to two different
// sessions. To safeguard, use the SessionGenerator to generate sessions. It's
// just a much better idea.
func session(ctx context.Context, net tn.Network, p testutil.Identity) Instance {
	bsdelay := delay.Fixed(0)
	const writeCacheElems = 100

	adapter := net.Adapter(p)
	dstore := ds_sync.MutexWrap(datastore2.WithDelay(ds.NewMapDatastore(), bsdelay))

	bstore, err := blockstore.WriteCached(blockstore.NewBlockstore(ds_sync.MutexWrap(dstore)), writeCacheElems)
	if err != nil {
		panic(err.Error()) // FIXME perhaps change signature and return error.
	}

	const alwaysSendToPeer = true

	bs := New(ctx, p.ID(), adapter, bstore, alwaysSendToPeer).(*Bitswap)

	return Instance{
		Peer:            p.ID(),
		Exchange:        bs,
		blockstore:      bstore,
		blockstoreDelay: bsdelay,
	}
}