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/*
* Copyright 2018 The WebRTC Project Authors. All rights reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#ifndef RTC_BASE_MDNS_RESPONDER_INTERFACE_H_
#define RTC_BASE_MDNS_RESPONDER_INTERFACE_H_
#include <functional>
#include "absl/strings/string_view.h"
#include "rtc_base/ip_address.h"
namespace webrtc {
// Defines an mDNS responder that can be used in ICE candidate gathering, where
// the local IP addresses of host candidates are replaced by mDNS hostnames.
class MdnsResponderInterface {
public:
using NameCreatedCallback =
std::function<void(const IPAddress&, absl::string_view)>;
using NameRemovedCallback = std::function<void(bool)>;
MdnsResponderInterface() = default;
virtual ~MdnsResponderInterface() = default;
// Asynchronously creates and returns a new name via `callback` for `addr` if
// there is no name mapped to it by this responder, and initializes the
// reference count of this name to one. Otherwise the existing name mapped to
// `addr` is returned and its reference count is incremented by one.
virtual void CreateNameForAddress(const IPAddress& addr,
NameCreatedCallback callback) = 0;
// Decrements the reference count of the mapped name of `addr`, if
// there is a map created previously via CreateNameForAddress; asynchronously
// removes the association between `addr` and its mapped name, and returns
// true via `callback` if the decremented reference count reaches zero.
// Otherwise no operation is done and false is returned via `callback`
// asynchronously.
virtual void RemoveNameForAddress(const IPAddress& addr,
NameRemovedCallback callback) = 0;
};
} // namespace webrtc
#endif // RTC_BASE_MDNS_RESPONDER_INTERFACE_H_
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