net/base/network_change_notifier_linux.cc

   1 // Copyright (c) 2012 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
   5 #include "net/base/network_change_notifier_linux.h"
   6
   7 #include "base/bind.h"
   8 #include "base/compiler_specific.h"
   9 #include "base/threading/thread.h"
  10 #include "net/base/address_tracker_linux.h"
  11 #include "net/dns/dns_config_service.h"
  12
  13 namespace net {
  14
  15 class NetworkChangeNotifierLinux::Thread : public base::Thread {
  16  public:
  17   Thread();
  18   ~Thread() override;
  19
  20   // Plumbing for NetworkChangeNotifier::GetCurrentConnectionType.
  21   // Safe to call from any thread.
  22   NetworkChangeNotifier::ConnectionType GetCurrentConnectionType() {
  23     return address_tracker_.GetCurrentConnectionType();
  24   }
  25
  26   const internal::AddressTrackerLinux* address_tracker() const {
  27     return &address_tracker_;
  28   }
  29
  30  protected:
  31   // base::Thread
  32   void Init() override;
  33   void CleanUp() override;
  34
  35  private:
  36   scoped_ptr<DnsConfigService> dns_config_service_;
  37   // Used to detect online/offline state and IP address changes.
  38   internal::AddressTrackerLinux address_tracker_;
  39
  40   DISALLOW_COPY_AND_ASSIGN(Thread);
  41 };
  42
  43 NetworkChangeNotifierLinux::Thread::Thread()
  44     : base::Thread("NetworkChangeNotifier"),
  45       address_tracker_(
  46           base::Bind(&NetworkChangeNotifier::
  47                      NotifyObserversOfIPAddressChange),
  48           base::Bind(&NetworkChangeNotifier::
  49                      NotifyObserversOfConnectionTypeChange),
  50           base::Bind(base::DoNothing)) {
  51 }
  52
  53 NetworkChangeNotifierLinux::Thread::~Thread() {
  54   DCHECK(!Thread::IsRunning());
  55 }
  56
  57 void NetworkChangeNotifierLinux::Thread::Init() {
  58   address_tracker_.Init();
  59   dns_config_service_ = DnsConfigService::CreateSystemService();
  60   dns_config_service_->WatchConfig(
  61       base::Bind(&NetworkChangeNotifier::SetDnsConfig));
  62 }
  63
  64 void NetworkChangeNotifierLinux::Thread::CleanUp() {
  65   dns_config_service_.reset();
  66 }
  67
  68 NetworkChangeNotifierLinux* NetworkChangeNotifierLinux::Create() {
  69   return new NetworkChangeNotifierLinux();
  70 }
  71
  72 NetworkChangeNotifierLinux::NetworkChangeNotifierLinux()
  73     : NetworkChangeNotifier(NetworkChangeCalculatorParamsLinux()),
  74       notifier_thread_(new Thread()) {
  75   // We create this notifier thread because the notification implementation
  76   // needs a MessageLoopForIO, and there's no guarantee that
  77   // MessageLoop::current() meets that criterion.
  78   base::Thread::Options thread_options(base::MessageLoop::TYPE_IO, 0);
  79   notifier_thread_->StartWithOptions(thread_options);
  80 }
  81
  82 NetworkChangeNotifierLinux::~NetworkChangeNotifierLinux() {
  83   // Stopping from here allows us to sanity- check that the notifier
  84   // thread shut down properly.
  85   notifier_thread_->Stop();
  86 }
  87
  88 // static
  89 NetworkChangeNotifier::NetworkChangeCalculatorParams
  90 NetworkChangeNotifierLinux::NetworkChangeCalculatorParamsLinux() {
  91   NetworkChangeCalculatorParams params;
  92   // Delay values arrived at by simple experimentation and adjusted so as to
  93   // produce a single signal when switching between network connections.
  94   params.ip_address_offline_delay_ = base::TimeDelta::FromMilliseconds(2000);
  95   params.ip_address_online_delay_ = base::TimeDelta::FromMilliseconds(2000);
  96   params.connection_type_offline_delay_ =
  97       base::TimeDelta::FromMilliseconds(1500);
  98   params.connection_type_online_delay_ = base::TimeDelta::FromMilliseconds(500);
  99   return params;
 100 }
 101
 102 NetworkChangeNotifier::ConnectionType
 103 NetworkChangeNotifierLinux::GetCurrentConnectionType() const {
 104   return notifier_thread_->GetCurrentConnectionType();
 105 }
 106
 107 const internal::AddressTrackerLinux*
 108 NetworkChangeNotifierLinux::GetAddressTrackerInternal() const {
 109   return notifier_thread_->address_tracker();
 110 }
 111
 112 }  // namespace net