73 lines
2.5 KiB
C
73 lines
2.5 KiB
C
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/*
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* Copyright 2008 The WebRTC Project Authors. All rights reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef RTC_BASE_ASYNC_RESOLVER_H_
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#define RTC_BASE_ASYNC_RESOLVER_H_
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#if defined(WEBRTC_POSIX)
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#include <sys/socket.h>
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#elif WEBRTC_WIN
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#include <winsock2.h> // NOLINT
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#endif
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#include <memory>
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#include <vector>
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#include "api/sequence_checker.h"
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#include "rtc_base/async_resolver_interface.h"
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#include "rtc_base/ip_address.h"
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#include "rtc_base/socket_address.h"
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#include "rtc_base/system/no_unique_address.h"
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#include "rtc_base/system/rtc_export.h"
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#include "rtc_base/task_utils/pending_task_safety_flag.h"
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#include "rtc_base/thread.h"
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#include "rtc_base/thread_annotations.h"
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namespace rtc {
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// AsyncResolver will perform async DNS resolution, signaling the result on
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// the SignalDone from AsyncResolverInterface when the operation completes.
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//
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// This class is thread-compatible, and all methods and destruction needs to
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// happen from the same rtc::Thread, except for Destroy which is allowed to
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// happen on another context provided it's not happening concurrently to another
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// public API call, and is the last access to the object.
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class RTC_EXPORT AsyncResolver : public AsyncResolverInterface {
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public:
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AsyncResolver();
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~AsyncResolver() override;
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void Start(const SocketAddress& addr) override;
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bool GetResolvedAddress(int family, SocketAddress* addr) const override;
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int GetError() const override;
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void Destroy(bool wait) override;
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const std::vector<IPAddress>& addresses() const;
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private:
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void ResolveDone(std::vector<IPAddress> addresses, int error)
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RTC_EXCLUSIVE_LOCKS_REQUIRED(sequence_checker_);
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void MaybeSelfDestruct();
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SocketAddress addr_ RTC_GUARDED_BY(sequence_checker_);
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std::vector<IPAddress> addresses_ RTC_GUARDED_BY(sequence_checker_);
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int error_ RTC_GUARDED_BY(sequence_checker_);
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webrtc::ScopedTaskSafety safety_ RTC_GUARDED_BY(sequence_checker_);
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std::unique_ptr<Thread> popup_thread_ RTC_GUARDED_BY(sequence_checker_);
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bool recursion_check_ =
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false; // Protects against SignalDone calling into Destroy.
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bool destroy_called_ = false;
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RTC_NO_UNIQUE_ADDRESS webrtc::SequenceChecker sequence_checker_;
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};
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} // namespace rtc
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#endif // RTC_BASE_ASYNC_RESOLVER_H_
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