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/*
* Copyright 2023 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_ASYNC_DNS_RESOLVER_H_
#define RTC_BASE_ASYNC_DNS_RESOLVER_H_
#include <vector>
#include "absl/functional/any_invocable.h"
#include "api/async_dns_resolver.h"
#include "api/scoped_refptr.h"
#include "api/sequence_checker.h"
#include "api/task_queue/pending_task_safety_flag.h"
#include "rtc_base/ip_address.h"
#include "rtc_base/socket_address.h"
#include "rtc_base/system/no_unique_address.h"
#include "rtc_base/system/rtc_export.h"
#include "rtc_base/thread_annotations.h"
namespace webrtc {
// This file contains a default implementation of
// AsyncDnsResolverInterface, for use when there is no need for special
// treatment.
class AsyncDnsResolverResultImpl : public AsyncDnsResolverResult {
public:
bool GetResolvedAddress(int family, SocketAddress* addr) const override;
// Returns error from resolver.
int GetError() const override;
private:
friend class AsyncDnsResolver;
RTC_NO_UNIQUE_ADDRESS SequenceChecker sequence_checker_;
SocketAddress addr_ RTC_GUARDED_BY(sequence_checker_);
std::vector<IPAddress> addresses_ RTC_GUARDED_BY(sequence_checker_);
int error_ RTC_GUARDED_BY(sequence_checker_);
};
class RTC_EXPORT AsyncDnsResolver : public AsyncDnsResolverInterface {
public:
AsyncDnsResolver();
~AsyncDnsResolver();
// Start address resolution of the hostname in `addr`.
void Start(const SocketAddress& addr,
absl::AnyInvocable<void()> callback) override;
// Start address resolution of the hostname in `addr` matching `family`.
void Start(const SocketAddress& addr,
int family,
absl::AnyInvocable<void()> callback) override;
const AsyncDnsResolverResult& result() const override;
private:
class State;
ScopedTaskSafety safety_; // To check for client going away
scoped_refptr<State> state_; // To check for "this" going away
AsyncDnsResolverResultImpl result_;
absl::AnyInvocable<void()> callback_;
};
} // namespace webrtc
#endif // RTC_BASE_ASYNC_DNS_RESOLVER_H_
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