webrtc/rtc_base/async_resolver.h
Mirko Bonadei e5f4c6b8d2 Reland "Refactor rtc_base build targets."
This is a reland of 69241a93fb

Fix: The problem was related to NO_MAIN_THREAD_WRAPPING, which
affects https://source.chromium.org/chromium/chromium/src/+/master:third_party/webrtc/rtc_base/thread.cc;l=257-263;drc=7acc2d9fe3a6e3c4d8881d2bdfc9b8968a724cd5.
The original CL didn't attach the definition of the macro
NO_MAIN_THREAD_WRAPPING when building for Chromium (which doesn't have
to be related to //rtc_base anymore but to //rtc_base:threading).

Original change's description:
> Refactor rtc_base build targets.
>
> The "//rtc_base:rtc_base" build target has historically been one of the
> biggest targets in the WebRTC build. Big targets are the main source of
> circular dependencies and non-API types leakage.
>
> This CL is a step forward into splitting "//rtc_base:rtc_base" into
> smaller targets (as originally started in 2018).
>
> The only non-automated changes are (like re-wiring the build system):
> * The creation of //rtc_base/async_resolver.{h,cc} which allows to
>   break a circular dependency (is has been extracted from
>   //rtc_base/net_helpers.{h,cc}).
> * The creation of //rtc_base/internal/default_socket_server.{h,cc} to
>   break another circular dependency.
>
> Bug: webrtc:9987
> Change-Id: I0c8f5e7efe2c8fd8e6bffa0d6dd2dd494cf3df02
> Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/196903
> Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
> Reviewed-by: Harald Alvestrand <hta@webrtc.org>
> Cr-Commit-Position: refs/heads/master@{#32941}

Bug: webrtc:9987
Change-Id: I7cdf49d2aac8357f1f50f90010bf2c2f62fa19f6
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/202021
Reviewed-by: Niels Moller <nisse@webrtc.org>
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#33001}
2021-01-15 17:00:05 +00:00

72 lines
2.5 KiB
C++

/*
* 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 <memory>
#include <vector>
#include "rtc_base/async_resolver_interface.h"
#include "rtc_base/ip_address.h"
#include "rtc_base/socket_address.h"
#include "rtc_base/synchronization/sequence_checker.h"
#include "rtc_base/system/no_unique_address.h"
#include "rtc_base/system/rtc_export.h"
#include "rtc_base/task_utils/pending_task_safety_flag.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;
bool GetResolvedAddress(int family, SocketAddress* addr) const override;
int GetError() const override;
void Destroy(bool wait) override;
const std::vector<IPAddress>& addresses() const;
private:
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_);
webrtc::ScopedTaskSafety safety_ RTC_GUARDED_BY(sequence_checker_);
std::unique_ptr<Thread> popup_thread_ RTC_GUARDED_BY(sequence_checker_);
bool recursion_check_ =
false; // Protects against SignalDone calling into Destroy.
bool destroy_called_ = false;
RTC_NO_UNIQUE_ADDRESS webrtc::SequenceChecker sequence_checker_;
};
} // namespace rtc
#endif // RTC_BASE_ASYNC_RESOLVER_H_