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   void OnIPAddressChanged();
  37   void OnLinkChanged();
  38   scoped_ptr<DnsConfigService> dns_config_service_;
  39   // Used to detect online/offline state and IP address changes.
  40   internal::AddressTrackerLinux address_tracker_;
  41   NetworkChangeNotifier::ConnectionType last_type_;
  42
  43   DISALLOW_COPY_AND_ASSIGN(Thread);
  44 };
  45
  46 NetworkChangeNotifierLinux::Thread::Thread()
  47     : base::Thread("NetworkChangeNotifier"),
  48       address_tracker_(
  49           base::Bind(&NetworkChangeNotifierLinux::Thread::OnIPAddressChanged,
  50                      base::Unretained(this)),
  51           base::Bind(&NetworkChangeNotifierLinux::Thread::OnLinkChanged,
  52                      base::Unretained(this)),
  53           base::Bind(base::DoNothing)),
  54       last_type_(NetworkChangeNotifier::CONNECTION_NONE) {
  55 }
  56
  57 NetworkChangeNotifierLinux::Thread::~Thread() {
  58   DCHECK(!Thread::IsRunning());
  59 }
  60
  61 void NetworkChangeNotifierLinux::Thread::Init() {
  62   address_tracker_.Init();
  63   dns_config_service_ = DnsConfigService::CreateSystemService();
  64   dns_config_service_->WatchConfig(
  65       base::Bind(&NetworkChangeNotifier::SetDnsConfig));
  66 }
  67
  68 void NetworkChangeNotifierLinux::Thread::CleanUp() {
  69   dns_config_service_.reset();
  70 }
  71
  72 void NetworkChangeNotifierLinux::Thread::OnIPAddressChanged() {
  73   NetworkChangeNotifier::NotifyObserversOfIPAddressChange();
  74   // When the IP address of a network interface is added/deleted, the
  75   // connection type may have changed.
  76   OnLinkChanged();
  77 }
  78
  79 void NetworkChangeNotifierLinux::Thread::OnLinkChanged() {
  80   if (last_type_ != GetCurrentConnectionType()) {
  81     NetworkChangeNotifier::NotifyObserversOfConnectionTypeChange();
  82     last_type_ = GetCurrentConnectionType();
  83   }
  84 }
  85
  86 NetworkChangeNotifierLinux* NetworkChangeNotifierLinux::Create() {
  87   return new NetworkChangeNotifierLinux();
  88 }
  89
  90 NetworkChangeNotifierLinux::NetworkChangeNotifierLinux()
  91     : NetworkChangeNotifier(NetworkChangeCalculatorParamsLinux()),
  92       notifier_thread_(new Thread()) {
  93   // We create this notifier thread because the notification implementation
  94   // needs a MessageLoopForIO, and there's no guarantee that
  95   // MessageLoop::current() meets that criterion.
  96   base::Thread::Options thread_options(base::MessageLoop::TYPE_IO, 0);
  97   notifier_thread_->StartWithOptions(thread_options);
  98 }
  99
 100 NetworkChangeNotifierLinux::~NetworkChangeNotifierLinux() {
 101   // Stopping from here allows us to sanity- check that the notifier
 102   // thread shut down properly.
 103   notifier_thread_->Stop();
 104 }
 105
 106 // static
 107 NetworkChangeNotifier::NetworkChangeCalculatorParams
 108 NetworkChangeNotifierLinux::NetworkChangeCalculatorParamsLinux() {
 109   NetworkChangeCalculatorParams params;
 110   // Delay values arrived at by simple experimentation and adjusted so as to
 111   // produce a single signal when switching between network connections.
 112   params.ip_address_offline_delay_ = base::TimeDelta::FromMilliseconds(2000);
 113   params.ip_address_online_delay_ = base::TimeDelta::FromMilliseconds(2000);
 114   params.connection_type_offline_delay_ =
 115       base::TimeDelta::FromMilliseconds(1500);
 116   params.connection_type_online_delay_ = base::TimeDelta::FromMilliseconds(500);
 117   return params;
 118 }
 119
 120 NetworkChangeNotifier::ConnectionType
 121 NetworkChangeNotifierLinux::GetCurrentConnectionType() const {
 122   return notifier_thread_->GetCurrentConnectionType();
 123 }
 124
 125 const internal::AddressTrackerLinux*
 126 NetworkChangeNotifierLinux::GetAddressTrackerInternal() const {
 127   return notifier_thread_->address_tracker();
 128 }
 129
 130 }  // namespace net