net/base/network_config_watcher_mac.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_config_watcher_mac.h"
   6
   7 #include <algorithm>
   8
   9 #include "base/bind.h"
  10 #include "base/compiler_specific.h"
  11 #include "base/memory/weak_ptr.h"
  12 #include "base/message_loop/message_loop.h"
  13 #include "base/threading/thread.h"
  14 #include "base/threading/thread_restrictions.h"
  15
  16 namespace net {
  17
  18 namespace {
  19
  20 #if !defined(OS_IOS)
  21 // Called back by OS.  Calls OnNetworkConfigChange().
  22 void DynamicStoreCallback(SCDynamicStoreRef /* store */,
  23                           CFArrayRef changed_keys,
  24                           void* config_delegate) {
  25   NetworkConfigWatcherMac::Delegate* net_config_delegate =
  26       static_cast<NetworkConfigWatcherMac::Delegate*>(config_delegate);
  27   net_config_delegate->OnNetworkConfigChange(changed_keys);
  28 }
  29 #endif  // !defined(OS_IOS)
  30
  31 class NetworkConfigWatcherMacThread : public base::Thread {
  32  public:
  33   NetworkConfigWatcherMacThread(NetworkConfigWatcherMac::Delegate* delegate);
  34   ~NetworkConfigWatcherMacThread() override;
  35
  36  protected:
  37   // base::Thread
  38   void Init() override;
  39   void CleanUp() override;
  40
  41  private:
  42   // The SystemConfiguration calls in this function can lead to contention early
  43   // on, so we invoke this function later on in startup to keep it fast.
  44   void InitNotifications();
  45
  46   base::ScopedCFTypeRef<CFRunLoopSourceRef> run_loop_source_;
  47   NetworkConfigWatcherMac::Delegate* const delegate_;
  48   base::WeakPtrFactory<NetworkConfigWatcherMacThread> weak_factory_;
  49
  50   DISALLOW_COPY_AND_ASSIGN(NetworkConfigWatcherMacThread);
  51 };
  52
  53 NetworkConfigWatcherMacThread::NetworkConfigWatcherMacThread(
  54     NetworkConfigWatcherMac::Delegate* delegate)
  55     : base::Thread("NetworkConfigWatcher"),
  56       delegate_(delegate),
  57       weak_factory_(this) {}
  58
  59 NetworkConfigWatcherMacThread::~NetworkConfigWatcherMacThread() {
  60   // Allow IO because Stop() calls PlatformThread::Join(), which is a blocking
  61   // operation. This is expected during shutdown.
  62   base::ThreadRestrictions::ScopedAllowIO allow_io;
  63
  64   Stop();
  65 }
  66
  67 void NetworkConfigWatcherMacThread::Init() {
  68   // Disallow IO to make sure NetworkConfigWatcherMacThread's helper thread does
  69   // not perform blocking operations.
  70   base::ThreadRestrictions::SetIOAllowed(false);
  71
  72   delegate_->Init();
  73
  74   // TODO(willchan): Look to see if there's a better signal for when it's ok to
  75   // initialize this, rather than just delaying it by a fixed time.
  76   const base::TimeDelta kInitializationDelay = base::TimeDelta::FromSeconds(1);
  77   message_loop()->PostDelayedTask(
  78       FROM_HERE,
  79       base::Bind(&NetworkConfigWatcherMacThread::InitNotifications,
  80                  weak_factory_.GetWeakPtr()),
  81       kInitializationDelay);
  82 }
  83
  84 void NetworkConfigWatcherMacThread::CleanUp() {
  85   if (!run_loop_source_.get())
  86     return;
  87
  88   CFRunLoopRemoveSource(CFRunLoopGetCurrent(), run_loop_source_.get(),
  89                         kCFRunLoopCommonModes);
  90   run_loop_source_.reset();
  91 }
  92
  93 void NetworkConfigWatcherMacThread::InitNotifications() {
  94 #if !defined(OS_IOS)
  95   // SCDynamicStore API does not exist on iOS.
  96   // Add a run loop source for a dynamic store to the current run loop.
  97   SCDynamicStoreContext context = {
  98     0,          // Version 0.
  99     delegate_,  // User data.
 100     NULL,       // This is not reference counted.  No retain function.
 101     NULL,       // This is not reference counted.  No release function.
 102     NULL,       // No description for this.
 103   };
 104   base::ScopedCFTypeRef<SCDynamicStoreRef> store(SCDynamicStoreCreate(
 105       NULL, CFSTR("org.chromium"), DynamicStoreCallback, &context));
 106   run_loop_source_.reset(SCDynamicStoreCreateRunLoopSource(
 107       NULL, store.get(), 0));
 108   CFRunLoopAddSource(CFRunLoopGetCurrent(), run_loop_source_.get(),
 109                      kCFRunLoopCommonModes);
 110 #endif  // !defined(OS_IOS)
 111
 112   // Set up notifications for interface and IP address changes.
 113   delegate_->StartReachabilityNotifications();
 114 #if !defined(OS_IOS)
 115   delegate_->SetDynamicStoreNotificationKeys(store.get());
 116 #endif  // !defined(OS_IOS)
 117 }
 118
 119 }  // namespace
 120
 121 NetworkConfigWatcherMac::NetworkConfigWatcherMac(Delegate* delegate)
 122     : notifier_thread_(new NetworkConfigWatcherMacThread(delegate)) {
 123   // We create this notifier thread because the notification implementation
 124   // needs a thread with a CFRunLoop, and there's no guarantee that
 125   // MessageLoop::current() meets that criterion.
 126   base::Thread::Options thread_options(base::MessageLoop::TYPE_UI, 0);
 127   notifier_thread_->StartWithOptions(thread_options);
 128 }
 129
 130 NetworkConfigWatcherMac::~NetworkConfigWatcherMac() {}
 131
 132 }  // namespace net