// Copyright 2015 The Vanadium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package discovery

import (
	"v.io/v23/discovery"
	"v.io/v23/security/access"
)

// Directory is the interface for advertisement directory service.
type Directory interface {
	// Lookup returns the advertisement of the given service instance.
	//
	// The returned advertisement may not include all attachments.
	Lookup(id discovery.AdId) (AdInfo | error) {access.Read}

	// GetAttachment returns the named attachment. Accessing non-existent attachment
	// is not an error - nil data is returned if not found.
	//
	// TODO(jhahn): Consider to return an error if not found.
	GetAttachment(id discovery.AdId, name string) ([]byte | error) {access.Read}
}