Repo created

TMessagesProj/jni/voip/webrtc/rtc_base/async_dns_resolver.h

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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 "api/async_dns_resolver.h"
+#include "api/sequence_checker.h"
+#include "api/task_queue/pending_task_safety_flag.h"
+#include "rtc_base/ref_counted_object.h"
+#include "rtc_base/system/rtc_export.h"
+#include "rtc_base/thread_annotations.h"
+
+namespace webrtc {
+// This file contains a default implementation of
+// webrtc::AsyncDnsResolverInterface, for use when there is no need for special
+// treatment.
+
+class AsyncDnsResolverResultImpl : public AsyncDnsResolverResult {
+ public:
+  bool GetResolvedAddress(int family, rtc::SocketAddress* addr) const override;
+  // Returns error from resolver.
+  int GetError() const override;
+
+ private:
+  friend class AsyncDnsResolver;
+  RTC_NO_UNIQUE_ADDRESS webrtc::SequenceChecker sequence_checker_;
+  rtc::SocketAddress addr_ RTC_GUARDED_BY(sequence_checker_);
+  std::vector<rtc::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 rtc::SocketAddress& addr,
+             absl::AnyInvocable<void()> callback) override;
+  // Start address resolution of the hostname in `addr` matching `family`.
+  void Start(const rtc::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
+  rtc::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_