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/*
* Copyright 2004 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_UDP_SOCKET_H_
#define RTC_BASE_ASYNC_UDP_SOCKET_H_
#include <stddef.h>
#include <cstdint>
#include <memory>
#include "absl/types/optional.h"
#include "api/sequence_checker.h"
#include "rtc_base/async_packet_socket.h"
#include "rtc_base/socket.h"
#include "rtc_base/socket_address.h"
#include "rtc_base/socket_factory.h"
#include "rtc_base/thread_annotations.h"
namespace rtc {
// Provides the ability to receive packets asynchronously. Sends are not
// buffered since it is acceptable to drop packets under high load.
class AsyncUDPSocket : public AsyncPacketSocket {
public:
// Binds `socket` and creates AsyncUDPSocket for it. Takes ownership
// of `socket`. Returns null if bind() fails (`socket` is destroyed
// in that case).
static AsyncUDPSocket* Create(Socket* socket,
const SocketAddress& bind_address);
// Creates a new socket for sending asynchronous UDP packets using an
// asynchronous socket from the given factory.
static AsyncUDPSocket* Create(SocketFactory* factory,
const SocketAddress& bind_address);
explicit AsyncUDPSocket(Socket* socket);
~AsyncUDPSocket() = default;
SocketAddress GetLocalAddress() const override;
SocketAddress GetRemoteAddress() const override;
int Send(const void* pv,
size_t cb,
const rtc::PacketOptions& options) override;
int SendTo(const void* pv,
size_t cb,
const SocketAddress& addr,
const rtc::PacketOptions& options) override;
int Close() override;
State GetState() const override;
int GetOption(Socket::Option opt, int* value) override;
int SetOption(Socket::Option opt, int value) override;
int GetError() const override;
void SetError(int error) override;
private:
// Called when the underlying socket is ready to be read from.
void OnReadEvent(Socket* socket);
// Called when the underlying socket is ready to send.
void OnWriteEvent(Socket* socket);
RTC_NO_UNIQUE_ADDRESS webrtc::SequenceChecker sequence_checker_;
std::unique_ptr<Socket> socket_;
static constexpr int BUF_SIZE = 64 * 1024;
char buf_[BUF_SIZE] RTC_GUARDED_BY(sequence_checker_);
absl::optional<int64_t> socket_time_offset_ RTC_GUARDED_BY(sequence_checker_);
};
} // namespace rtc
#endif // RTC_BASE_ASYNC_UDP_SOCKET_H_
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