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/*
* Copyright 2008 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_RESOLVER_H_
#define RTC_BASE_ASYNC_RESOLVER_H_
#if defined(WEBRTC_POSIX)
#include <sys/socket.h>
#elif WEBRTC_WIN
#include <winsock2.h> // NOLINT
#endif
#include <vector>
#include "api/sequence_checker.h"
#include "api/task_queue/pending_task_safety_flag.h"
#include "rtc_base/async_resolver_interface.h"
#include "rtc_base/event.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.h"
#include "rtc_base/thread_annotations.h"
namespace rtc {
// AsyncResolver will perform async DNS resolution, signaling the result on
// the SignalDone from AsyncResolverInterface when the operation completes.
//
// This class is thread-compatible, and all methods and destruction needs to
// happen from the same rtc::Thread, except for Destroy which is allowed to
// happen on another context provided it's not happening concurrently to another
// public API call, and is the last access to the object.
class RTC_EXPORT AsyncResolver : public AsyncResolverInterface {
public:
AsyncResolver();
~AsyncResolver() override;
void Start(const SocketAddress& addr) override;
void Start(const SocketAddress& addr, int family) override;
bool GetResolvedAddress(int family, SocketAddress* addr) const override;
int GetError() const override;
void Destroy(bool wait) override;
const std::vector<IPAddress>& addresses() const;
private:
// Fwd decl.
struct State;
void ResolveDone(std::vector<IPAddress> addresses, int error)
RTC_EXCLUSIVE_LOCKS_REQUIRED(sequence_checker_);
void MaybeSelfDestruct();
SocketAddress addr_ RTC_GUARDED_BY(sequence_checker_);
std::vector<IPAddress> addresses_ RTC_GUARDED_BY(sequence_checker_);
int error_ RTC_GUARDED_BY(sequence_checker_);
bool recursion_check_ =
false; // Protects against SignalDone calling into Destroy.
bool destroy_called_ = false;
scoped_refptr<State> state_;
RTC_NO_UNIQUE_ADDRESS webrtc::SequenceChecker sequence_checker_;
};
} // namespace rtc
#endif // RTC_BASE_ASYNC_RESOLVER_H_
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