dns_config_service_android.h 1.8 KB

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  1. // Copyright 2021 The Chromium Authors. All rights reserved.
  2. // Use of this source code is governed by a BSD-style license that can be
  3. // found in the LICENSE file.
  4. #ifndef NET_DNS_DNS_CONFIG_SERVICE_ANDROID_H_
  5. #define NET_DNS_DNS_CONFIG_SERVICE_ANDROID_H_
  6. #include <memory>
  7. #include "base/time/time.h"
  8. #include "net/android/network_library.h"
  9. #include "net/base/net_export.h"
  10. #include "net/dns/dns_config_service.h"
  11. namespace net {
  12. // Use DnsConfigService::CreateSystemService to use it outside of tests.
  13. namespace internal {
  14. // Service for reading and watching Android system DNS settings. This object is
  15. // not thread-safe and methods may perform blocking I/O so methods must be
  16. // called on a sequence that allows blocking (i.e. base::MayBlock). It may be
  17. // constructed on a different sequence than which it's later called on.
  18. class NET_EXPORT_PRIVATE DnsConfigServiceAndroid : public DnsConfigService {
  19. public:
  20. static constexpr base::TimeDelta kConfigChangeDelay = base::Milliseconds(50);
  21. DnsConfigServiceAndroid();
  22. ~DnsConfigServiceAndroid() override;
  23. DnsConfigServiceAndroid(const DnsConfigServiceAndroid&) = delete;
  24. DnsConfigServiceAndroid& operator=(const DnsConfigServiceAndroid&) = delete;
  25. // To be effective, must be called before the first config read. Also, may
  26. // outlive `this` and be run on other sequences.
  27. void set_dns_server_getter_for_testing(
  28. android::DnsServerGetter dns_server_getter) {
  29. dns_server_getter_ = std::move(dns_server_getter);
  30. }
  31. protected:
  32. // DnsConfigService:
  33. void ReadConfigNow() override;
  34. bool StartWatching() override;
  35. private:
  36. class Watcher;
  37. class ConfigReader;
  38. std::unique_ptr<Watcher> watcher_;
  39. std::unique_ptr<ConfigReader> config_reader_;
  40. android::DnsServerGetter dns_server_getter_;
  41. };
  42. } // namespace internal
  43. } // namespace net
  44. #endif // NET_DNS_DNS_CONFIG_SERVICE_ANDROID_H_