net/base/network_change_notifier.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.h"
   6
   7 #include "base/metrics/histogram.h"
   8 #include "base/synchronization/lock.h"
   9 #include "base/threading/thread_checker.h"
  10 #include "build/build_config.h"
  11 #include "net/base/net_util.h"
  12 #include "net/base/network_change_notifier_factory.h"
  13 #include "net/dns/dns_config_service.h"
  14 #include "net/url_request/url_request.h"
  15 #include "url/gurl.h"
  16
  17 #if defined(OS_ANDROID)
  18 #include "base/metrics/sparse_histogram.h"
  19 #include "base/strings/string_number_conversions.h"
  20 #include "net/android/network_library.h"
  21 #endif
  22
  23 #if defined(OS_WIN)
  24 #include "net/base/network_change_notifier_win.h"
  25 #elif defined(OS_LINUX) && !defined(OS_CHROMEOS)
  26 #include "net/base/network_change_notifier_linux.h"
  27 #elif defined(OS_MACOSX)
  28 #include "net/base/network_change_notifier_mac.h"
  29 #endif
  30
  31 namespace net {
  32
  33 namespace {
  34
  35 // The actual singleton notifier.  The class contract forbids usage of the API
  36 // in ways that would require us to place locks around access to this object.
  37 // (The prohibition on global non-POD objects makes it tricky to do such a thing
  38 // anyway.)
  39 NetworkChangeNotifier* g_network_change_notifier = NULL;
  40
  41 // Class factory singleton.
  42 NetworkChangeNotifierFactory* g_network_change_notifier_factory = NULL;
  43
  44 class MockNetworkChangeNotifier : public NetworkChangeNotifier {
  45  public:
  46   virtual ConnectionType GetCurrentConnectionType() const OVERRIDE {
  47     return CONNECTION_UNKNOWN;
  48   }
  49 };
  50
  51 }  // namespace
  52
  53 // The main observer class that records UMAs for network events.
  54 class HistogramWatcher
  55     : public NetworkChangeNotifier::ConnectionTypeObserver,
  56       public NetworkChangeNotifier::IPAddressObserver,
  57       public NetworkChangeNotifier::DNSObserver,
  58       public NetworkChangeNotifier::NetworkChangeObserver {
  59  public:
  60   HistogramWatcher()
  61       : last_ip_address_change_(base::TimeTicks::Now()),
  62         last_connection_change_(base::TimeTicks::Now()),
  63         last_dns_change_(base::TimeTicks::Now()),
  64         last_network_change_(base::TimeTicks::Now()),
  65         last_connection_type_(NetworkChangeNotifier::CONNECTION_UNKNOWN),
  66         offline_packets_received_(0),
  67         bytes_read_since_last_connection_change_(0),
  68         peak_kbps_since_last_connection_change_(0) {}
  69
  70   // Registers our three Observer implementations.  This is called from the
  71   // network thread so that our Observer implementations are also called
  72   // from the network thread.  This avoids multi-threaded race conditions
  73   // because the only other interface, |NotifyDataReceived| is also
  74   // only called from the network thread.
  75   void Init() {
  76     DCHECK(thread_checker_.CalledOnValidThread());
  77     DCHECK(g_network_change_notifier);
  78     NetworkChangeNotifier::AddConnectionTypeObserver(this);
  79     NetworkChangeNotifier::AddIPAddressObserver(this);
  80     NetworkChangeNotifier::AddDNSObserver(this);
  81     NetworkChangeNotifier::AddNetworkChangeObserver(this);
  82   }
  83
  84   virtual ~HistogramWatcher() {
  85     DCHECK(thread_checker_.CalledOnValidThread());
  86     DCHECK(g_network_change_notifier);
  87     NetworkChangeNotifier::RemoveConnectionTypeObserver(this);
  88     NetworkChangeNotifier::RemoveIPAddressObserver(this);
  89     NetworkChangeNotifier::RemoveDNSObserver(this);
  90     NetworkChangeNotifier::RemoveNetworkChangeObserver(this);
  91   }
  92
  93   // NetworkChangeNotifier::IPAddressObserver implementation.
  94   virtual void OnIPAddressChanged() OVERRIDE {
  95     DCHECK(thread_checker_.CalledOnValidThread());
  96     UMA_HISTOGRAM_MEDIUM_TIMES("NCN.IPAddressChange",
  97                                SinceLast(&last_ip_address_change_));
  98     UMA_HISTOGRAM_MEDIUM_TIMES(
  99         "NCN.ConnectionTypeChangeToIPAddressChange",
 100         last_ip_address_change_ - last_connection_change_);
 101   }
 102
 103   // NetworkChangeNotifier::ConnectionTypeObserver implementation.
 104   virtual void OnConnectionTypeChanged(
 105       NetworkChangeNotifier::ConnectionType type) OVERRIDE {
 106     DCHECK(thread_checker_.CalledOnValidThread());
 107     base::TimeTicks now = base::TimeTicks::Now();
 108     int32 kilobytes_read = bytes_read_since_last_connection_change_ / 1000;
 109     base::TimeDelta state_duration = SinceLast(&last_connection_change_);
 110     if (bytes_read_since_last_connection_change_) {
 111       switch (last_connection_type_) {
 112         case NetworkChangeNotifier::CONNECTION_UNKNOWN:
 113           UMA_HISTOGRAM_TIMES("NCN.CM.FirstReadOnUnknown",
 114                               first_byte_after_connection_change_);
 115           UMA_HISTOGRAM_TIMES("NCN.CM.FastestRTTOnUnknown",
 116                               fastest_RTT_since_last_connection_change_);
 117           break;
 118         case NetworkChangeNotifier::CONNECTION_ETHERNET:
 119           UMA_HISTOGRAM_TIMES("NCN.CM.FirstReadOnEthernet",
 120                               first_byte_after_connection_change_);
 121           UMA_HISTOGRAM_TIMES("NCN.CM.FastestRTTOnEthernet",
 122                               fastest_RTT_since_last_connection_change_);
 123           break;
 124         case NetworkChangeNotifier::CONNECTION_WIFI:
 125           UMA_HISTOGRAM_TIMES("NCN.CM.FirstReadOnWifi",
 126                               first_byte_after_connection_change_);
 127           UMA_HISTOGRAM_TIMES("NCN.CM.FastestRTTOnWifi",
 128                               fastest_RTT_since_last_connection_change_);
 129           break;
 130         case NetworkChangeNotifier::CONNECTION_2G:
 131           UMA_HISTOGRAM_TIMES("NCN.CM.FirstReadOn2G",
 132                               first_byte_after_connection_change_);
 133           UMA_HISTOGRAM_TIMES("NCN.CM.FastestRTTOn2G",
 134                               fastest_RTT_since_last_connection_change_);
 135           break;
 136         case NetworkChangeNotifier::CONNECTION_3G:
 137           UMA_HISTOGRAM_TIMES("NCN.CM.FirstReadOn3G",
 138                               first_byte_after_connection_change_);
 139           UMA_HISTOGRAM_TIMES("NCN.CM.FastestRTTOn3G",
 140                               fastest_RTT_since_last_connection_change_);
 141           break;
 142         case NetworkChangeNotifier::CONNECTION_4G:
 143           UMA_HISTOGRAM_TIMES("NCN.CM.FirstReadOn4G",
 144                               first_byte_after_connection_change_);
 145           UMA_HISTOGRAM_TIMES("NCN.CM.FastestRTTOn4G",
 146                               fastest_RTT_since_last_connection_change_);
 147           break;
 148         case NetworkChangeNotifier::CONNECTION_NONE:
 149           UMA_HISTOGRAM_TIMES("NCN.CM.FirstReadOnNone",
 150                               first_byte_after_connection_change_);
 151           UMA_HISTOGRAM_TIMES("NCN.CM.FastestRTTOnNone",
 152                               fastest_RTT_since_last_connection_change_);
 153           break;
 154         case NetworkChangeNotifier::CONNECTION_BLUETOOTH:
 155           UMA_HISTOGRAM_TIMES("NCN.CM.FirstReadOnBluetooth",
 156                               first_byte_after_connection_change_);
 157           UMA_HISTOGRAM_TIMES("NCN.CM.FastestRTTOnBluetooth",
 158                               fastest_RTT_since_last_connection_change_);
 159       }
 160     }
 161     if (peak_kbps_since_last_connection_change_) {
 162       switch (last_connection_type_) {
 163         case NetworkChangeNotifier::CONNECTION_UNKNOWN:
 164           UMA_HISTOGRAM_COUNTS("NCN.CM.PeakKbpsOnUnknown",
 165                                peak_kbps_since_last_connection_change_);
 166           break;
 167         case NetworkChangeNotifier::CONNECTION_ETHERNET:
 168           UMA_HISTOGRAM_COUNTS("NCN.CM.PeakKbpsOnEthernet",
 169                                peak_kbps_since_last_connection_change_);
 170           break;
 171         case NetworkChangeNotifier::CONNECTION_WIFI:
 172           UMA_HISTOGRAM_COUNTS("NCN.CM.PeakKbpsOnWifi",
 173                                peak_kbps_since_last_connection_change_);
 174           break;
 175         case NetworkChangeNotifier::CONNECTION_2G:
 176           UMA_HISTOGRAM_COUNTS("NCN.CM.PeakKbpsOn2G",
 177                                peak_kbps_since_last_connection_change_);
 178           break;
 179         case NetworkChangeNotifier::CONNECTION_3G:
 180           UMA_HISTOGRAM_COUNTS("NCN.CM.PeakKbpsOn3G",
 181                                peak_kbps_since_last_connection_change_);
 182           break;
 183         case NetworkChangeNotifier::CONNECTION_4G:
 184           UMA_HISTOGRAM_COUNTS("NCN.CM.PeakKbpsOn4G",
 185                                peak_kbps_since_last_connection_change_);
 186           break;
 187         case NetworkChangeNotifier::CONNECTION_NONE:
 188           UMA_HISTOGRAM_COUNTS("NCN.CM.PeakKbpsOnNone",
 189                                peak_kbps_since_last_connection_change_);
 190           break;
 191         case NetworkChangeNotifier::CONNECTION_BLUETOOTH:
 192           UMA_HISTOGRAM_COUNTS("NCN.CM.PeakKbpsOnBluetooth",
 193                                peak_kbps_since_last_connection_change_);
 194           break;
 195       }
 196     }
 197     switch (last_connection_type_) {
 198       case NetworkChangeNotifier::CONNECTION_UNKNOWN:
 199         UMA_HISTOGRAM_LONG_TIMES("NCN.CM.TimeOnUnknown", state_duration);
 200         UMA_HISTOGRAM_COUNTS("NCN.CM.KBTransferedOnUnknown", kilobytes_read);
 201         break;
 202       case NetworkChangeNotifier::CONNECTION_ETHERNET:
 203         UMA_HISTOGRAM_LONG_TIMES("NCN.CM.TimeOnEthernet", state_duration);
 204         UMA_HISTOGRAM_COUNTS("NCN.CM.KBTransferedOnEthernet", kilobytes_read);
 205         break;
 206       case NetworkChangeNotifier::CONNECTION_WIFI:
 207         UMA_HISTOGRAM_LONG_TIMES("NCN.CM.TimeOnWifi", state_duration);
 208         UMA_HISTOGRAM_COUNTS("NCN.CM.KBTransferedOnWifi", kilobytes_read);
 209         break;
 210       case NetworkChangeNotifier::CONNECTION_2G:
 211         UMA_HISTOGRAM_LONG_TIMES("NCN.CM.TimeOn2G", state_duration);
 212         UMA_HISTOGRAM_COUNTS("NCN.CM.KBTransferedOn2G", kilobytes_read);
 213         break;
 214       case NetworkChangeNotifier::CONNECTION_3G:
 215         UMA_HISTOGRAM_LONG_TIMES("NCN.CM.TimeOn3G", state_duration);
 216         UMA_HISTOGRAM_COUNTS("NCN.CM.KBTransferedOn3G", kilobytes_read);
 217         break;
 218       case NetworkChangeNotifier::CONNECTION_4G:
 219         UMA_HISTOGRAM_LONG_TIMES("NCN.CM.TimeOn4G", state_duration);
 220         UMA_HISTOGRAM_COUNTS("NCN.CM.KBTransferedOn4G", kilobytes_read);
 221         break;
 222       case NetworkChangeNotifier::CONNECTION_NONE:
 223         UMA_HISTOGRAM_LONG_TIMES("NCN.CM.TimeOnNone", state_duration);
 224         UMA_HISTOGRAM_COUNTS("NCN.CM.KBTransferedOnNone", kilobytes_read);
 225         break;
 226       case NetworkChangeNotifier::CONNECTION_BLUETOOTH:
 227         UMA_HISTOGRAM_LONG_TIMES("NCN.CM.TimeOnBluetooth", state_duration);
 228         UMA_HISTOGRAM_COUNTS("NCN.CM.KBTransferedOnBluetooth", kilobytes_read);
 229         break;
 230     }
 231
 232     if (type != NetworkChangeNotifier::CONNECTION_NONE) {
 233       UMA_HISTOGRAM_MEDIUM_TIMES("NCN.OnlineChange", state_duration);
 234
 235       if (offline_packets_received_) {
 236         if ((now - last_offline_packet_received_) <
 237             base::TimeDelta::FromSeconds(5)) {
 238           // We can compare this sum with the sum of NCN.OfflineDataRecv.
 239           UMA_HISTOGRAM_COUNTS_10000(
 240               "NCN.OfflineDataRecvAny5sBeforeOnline",
 241               offline_packets_received_);
 242         }
 243
 244         UMA_HISTOGRAM_MEDIUM_TIMES("NCN.OfflineDataRecvUntilOnline",
 245                                    now - last_offline_packet_received_);
 246       }
 247     } else {
 248       UMA_HISTOGRAM_MEDIUM_TIMES("NCN.OfflineChange", state_duration);
 249     }
 250
 251     NetworkChangeNotifier::LogOperatorCodeHistogram(type);
 252
 253     UMA_HISTOGRAM_MEDIUM_TIMES(
 254         "NCN.IPAddressChangeToConnectionTypeChange",
 255         now - last_ip_address_change_);
 256
 257     offline_packets_received_ = 0;
 258     bytes_read_since_last_connection_change_ = 0;
 259     peak_kbps_since_last_connection_change_ = 0;
 260     last_connection_type_ = type;
 261     polling_interval_ = base::TimeDelta::FromSeconds(1);
 262   }
 263
 264   // NetworkChangeNotifier::DNSObserver implementation.
 265   virtual void OnDNSChanged() OVERRIDE {
 266     DCHECK(thread_checker_.CalledOnValidThread());
 267     UMA_HISTOGRAM_MEDIUM_TIMES("NCN.DNSConfigChange",
 268                                SinceLast(&last_dns_change_));
 269   }
 270
 271   // NetworkChangeNotifier::NetworkChangeObserver implementation.
 272   virtual void OnNetworkChanged(
 273       NetworkChangeNotifier::ConnectionType type) OVERRIDE {
 274     DCHECK(thread_checker_.CalledOnValidThread());
 275     if (type != NetworkChangeNotifier::CONNECTION_NONE) {
 276       UMA_HISTOGRAM_MEDIUM_TIMES("NCN.NetworkOnlineChange",
 277                                  SinceLast(&last_network_change_));
 278     } else {
 279       UMA_HISTOGRAM_MEDIUM_TIMES("NCN.NetworkOfflineChange",
 280                                  SinceLast(&last_network_change_));
 281     }
 282   }
 283
 284   // Record histogram data whenever we receive a packet. Should only be called
 285   // from the network thread.
 286   void NotifyDataReceived(const URLRequest& request, int bytes_read) {
 287     DCHECK(thread_checker_.CalledOnValidThread());
 288     if (IsLocalhost(request.url().host()) ||
 289         !request.url().SchemeIsHTTPOrHTTPS()) {
 290       return;
 291     }
 292
 293     base::TimeTicks now = base::TimeTicks::Now();
 294     base::TimeDelta request_duration = now - request.creation_time();
 295     if (bytes_read_since_last_connection_change_ == 0) {
 296       first_byte_after_connection_change_ = now - last_connection_change_;
 297       fastest_RTT_since_last_connection_change_ = request_duration;
 298     }
 299     bytes_read_since_last_connection_change_ += bytes_read;
 300     if (request_duration < fastest_RTT_since_last_connection_change_)
 301       fastest_RTT_since_last_connection_change_ = request_duration;
 302     // Ignore tiny transfers which will not produce accurate rates.
 303     // Ignore zero duration transfers which might cause divide by zero.
 304     if (bytes_read > 10000 &&
 305         request_duration > base::TimeDelta::FromMilliseconds(1) &&
 306         request.creation_time() > last_connection_change_) {
 307       int32 kbps = bytes_read * 8 / request_duration.InMilliseconds();
 308       if (kbps > peak_kbps_since_last_connection_change_)
 309         peak_kbps_since_last_connection_change_ = kbps;
 310     }
 311
 312     if (last_connection_type_ != NetworkChangeNotifier::CONNECTION_NONE)
 313       return;
 314
 315     UMA_HISTOGRAM_MEDIUM_TIMES("NCN.OfflineDataRecv",
 316                                now - last_connection_change_);
 317     offline_packets_received_++;
 318     last_offline_packet_received_ = now;
 319
 320     if ((now - last_polled_connection_) > polling_interval_) {
 321       polling_interval_ *= 2;
 322       last_polled_connection_ = now;
 323       last_polled_connection_type_ =
 324           NetworkChangeNotifier::GetConnectionType();
 325     }
 326     if (last_polled_connection_type_ ==
 327         NetworkChangeNotifier::CONNECTION_NONE) {
 328       UMA_HISTOGRAM_MEDIUM_TIMES("NCN.PollingOfflineDataRecv",
 329                                  now - last_connection_change_);
 330     }
 331   }
 332
 333  private:
 334   static base::TimeDelta SinceLast(base::TimeTicks *last_time) {
 335     base::TimeTicks current_time = base::TimeTicks::Now();
 336     base::TimeDelta delta = current_time - *last_time;
 337     *last_time = current_time;
 338     return delta;
 339   }
 340
 341   base::TimeTicks last_ip_address_change_;
 342   base::TimeTicks last_connection_change_;
 343   base::TimeTicks last_dns_change_;
 344   base::TimeTicks last_network_change_;
 345   base::TimeTicks last_offline_packet_received_;
 346   base::TimeTicks last_polled_connection_;
 347   // |polling_interval_| is initialized by |OnConnectionTypeChanged| on our
 348   // first transition to offline and on subsequent transitions.  Once offline,
 349   // |polling_interval_| doubles as offline data is received and we poll
 350   // with |NetworkChangeNotifier::GetConnectionType| to verify the connection
 351   // state.
 352   base::TimeDelta polling_interval_;
 353   // |last_connection_type_| is the last value passed to
 354   // |OnConnectionTypeChanged|.
 355   NetworkChangeNotifier::ConnectionType last_connection_type_;
 356   // |last_polled_connection_type_| is last result from calling
 357   // |NetworkChangeNotifier::GetConnectionType| in |NotifyDataReceived|.
 358   NetworkChangeNotifier::ConnectionType last_polled_connection_type_;
 359   // Count of how many times NotifyDataReceived() has been called while the
 360   // NetworkChangeNotifier thought network connection was offline.
 361   int32 offline_packets_received_;
 362   // Number of bytes of network data received since last connectivity change.
 363   int32 bytes_read_since_last_connection_change_;
 364   // Fastest round-trip-time (RTT) since last connectivity change. RTT measured
 365   // from URLRequest creation until first byte received.
 366   base::TimeDelta fastest_RTT_since_last_connection_change_;
 367   // Time between connectivity change and first network data byte received.
 368   base::TimeDelta first_byte_after_connection_change_;
 369   // Rough measurement of peak KB/s witnessed since last connectivity change.
 370   // The accuracy is decreased by ignoring these factors:
 371   // 1) Multiple URLRequests can occur concurrently.
 372   // 2) NotifyDataReceived() may be called repeatedly for one URLRequest.
 373   // 3) The transfer time includes at least one RTT while no bytes are read.
 374   // Erring on the conservative side is hopefully offset by taking the maximum.
 375   int32 peak_kbps_since_last_connection_change_;
 376
 377   base::ThreadChecker thread_checker_;
 378
 379   DISALLOW_COPY_AND_ASSIGN(HistogramWatcher);
 380 };
 381
 382 // NetworkState is thread safe.
 383 class NetworkChangeNotifier::NetworkState {
 384  public:
 385   NetworkState() {}
 386   ~NetworkState() {}
 387
 388   void GetDnsConfig(DnsConfig* config) const {
 389     base::AutoLock lock(lock_);
 390     *config = dns_config_;
 391   }
 392
 393   void SetDnsConfig(const DnsConfig& dns_config) {
 394     base::AutoLock lock(lock_);
 395     dns_config_ = dns_config;
 396   }
 397
 398  private:
 399   mutable base::Lock lock_;
 400   DnsConfig dns_config_;
 401 };
 402
 403 NetworkChangeNotifier::NetworkChangeCalculatorParams::
 404     NetworkChangeCalculatorParams() {
 405 }
 406
 407 // Calculates NetworkChange signal from IPAddress and ConnectionType signals.
 408 class NetworkChangeNotifier::NetworkChangeCalculator
 409     : public ConnectionTypeObserver,
 410       public IPAddressObserver {
 411  public:
 412   NetworkChangeCalculator(const NetworkChangeCalculatorParams& params)
 413       : params_(params),
 414         have_announced_(false),
 415         last_announced_connection_type_(CONNECTION_NONE),
 416         pending_connection_type_(CONNECTION_NONE) {}
 417
 418   void Init() {
 419     DCHECK(thread_checker_.CalledOnValidThread());
 420     DCHECK(g_network_change_notifier);
 421     AddConnectionTypeObserver(this);
 422     AddIPAddressObserver(this);
 423   }
 424
 425   virtual ~NetworkChangeCalculator() {
 426     DCHECK(thread_checker_.CalledOnValidThread());
 427     DCHECK(g_network_change_notifier);
 428     RemoveConnectionTypeObserver(this);
 429     RemoveIPAddressObserver(this);
 430   }
 431
 432   // NetworkChangeNotifier::IPAddressObserver implementation.
 433   virtual void OnIPAddressChanged() OVERRIDE {
 434     DCHECK(thread_checker_.CalledOnValidThread());
 435     base::TimeDelta delay = last_announced_connection_type_ == CONNECTION_NONE
 436         ? params_.ip_address_offline_delay_ : params_.ip_address_online_delay_;
 437     // Cancels any previous timer.
 438     timer_.Start(FROM_HERE, delay, this, &NetworkChangeCalculator::Notify);
 439   }
 440
 441   // NetworkChangeNotifier::ConnectionTypeObserver implementation.
 442   virtual void OnConnectionTypeChanged(ConnectionType type) OVERRIDE {
 443     DCHECK(thread_checker_.CalledOnValidThread());
 444     pending_connection_type_ = type;
 445     base::TimeDelta delay = last_announced_connection_type_ == CONNECTION_NONE
 446         ? params_.connection_type_offline_delay_
 447         : params_.connection_type_online_delay_;
 448     // Cancels any previous timer.
 449     timer_.Start(FROM_HERE, delay, this, &NetworkChangeCalculator::Notify);
 450   }
 451
 452  private:
 453   void Notify() {
 454     DCHECK(thread_checker_.CalledOnValidThread());
 455     // Don't bother signaling about dead connections.
 456     if (have_announced_ &&
 457         (last_announced_connection_type_ == CONNECTION_NONE) &&
 458         (pending_connection_type_ == CONNECTION_NONE)) {
 459       return;
 460     }
 461     have_announced_ = true;
 462     last_announced_connection_type_ = pending_connection_type_;
 463     // Immediately before sending out an online signal, send out an offline
 464     // signal to perform any destructive actions before constructive actions.
 465     if (pending_connection_type_ != CONNECTION_NONE)
 466       NetworkChangeNotifier::NotifyObserversOfNetworkChange(CONNECTION_NONE);
 467     NetworkChangeNotifier::NotifyObserversOfNetworkChange(
 468         pending_connection_type_);
 469   }
 470
 471   const NetworkChangeCalculatorParams params_;
 472
 473   // Indicates if NotifyObserversOfNetworkChange has been called yet.
 474   bool have_announced_;
 475   // Last value passed to NotifyObserversOfNetworkChange.
 476   ConnectionType last_announced_connection_type_;
 477   // Value to pass to NotifyObserversOfNetworkChange when Notify is called.
 478   ConnectionType pending_connection_type_;
 479   // Used to delay notifications so duplicates can be combined.
 480   base::OneShotTimer<NetworkChangeCalculator> timer_;
 481
 482   base::ThreadChecker thread_checker_;
 483
 484   DISALLOW_COPY_AND_ASSIGN(NetworkChangeCalculator);
 485 };
 486
 487 NetworkChangeNotifier::~NetworkChangeNotifier() {
 488   network_change_calculator_.reset();
 489   DCHECK_EQ(this, g_network_change_notifier);
 490   g_network_change_notifier = NULL;
 491 }
 492
 493 // static
 494 void NetworkChangeNotifier::SetFactory(
 495     NetworkChangeNotifierFactory* factory) {
 496   CHECK(!g_network_change_notifier_factory);
 497   g_network_change_notifier_factory = factory;
 498 }
 499
 500 // static
 501 NetworkChangeNotifier* NetworkChangeNotifier::Create() {
 502   if (g_network_change_notifier_factory)
 503     return g_network_change_notifier_factory->CreateInstance();
 504
 505 #if defined(OS_WIN)
 506   NetworkChangeNotifierWin* network_change_notifier =
 507       new NetworkChangeNotifierWin();
 508   network_change_notifier->WatchForAddressChange();
 509   return network_change_notifier;
 510 #elif defined(OS_CHROMEOS) || defined(OS_ANDROID)
 511   // ChromeOS and Android builds MUST use their own class factory.
 512 #if !defined(OS_CHROMEOS)
 513   // TODO(oshima): ash_shell do not have access to chromeos'es
 514   // notifier yet. Re-enable this when chromeos'es notifier moved to
 515   // chromeos root directory. crbug.com/119298.
 516   CHECK(false);
 517 #endif
 518   return NULL;
 519 #elif defined(OS_LINUX)
 520   return NetworkChangeNotifierLinux::Create();
 521 #elif defined(OS_MACOSX)
 522   return new NetworkChangeNotifierMac();
 523 #else
 524   NOTIMPLEMENTED();
 525   return NULL;
 526 #endif
 527 }
 528
 529 // static
 530 NetworkChangeNotifier::ConnectionType
 531 NetworkChangeNotifier::GetConnectionType() {
 532   return g_network_change_notifier ?
 533       g_network_change_notifier->GetCurrentConnectionType() :
 534       CONNECTION_UNKNOWN;
 535 }
 536
 537 // static
 538 void NetworkChangeNotifier::GetDnsConfig(DnsConfig* config) {
 539   if (!g_network_change_notifier) {
 540     *config = DnsConfig();
 541   } else {
 542     g_network_change_notifier->network_state_->GetDnsConfig(config);
 543   }
 544 }
 545
 546 // static
 547 const char* NetworkChangeNotifier::ConnectionTypeToString(
 548     ConnectionType type) {
 549   static const char* kConnectionTypeNames[] = {
 550     "CONNECTION_UNKNOWN",
 551     "CONNECTION_ETHERNET",
 552     "CONNECTION_WIFI",
 553     "CONNECTION_2G",
 554     "CONNECTION_3G",
 555     "CONNECTION_4G",
 556     "CONNECTION_NONE",
 557     "CONNECTION_BLUETOOTH"
 558   };
 559   COMPILE_ASSERT(
 560       arraysize(kConnectionTypeNames) ==
 561           NetworkChangeNotifier::CONNECTION_LAST + 1,
 562       ConnectionType_name_count_mismatch);
 563   if (type < CONNECTION_UNKNOWN || type > CONNECTION_LAST) {
 564     NOTREACHED();
 565     return "CONNECTION_INVALID";
 566   }
 567   return kConnectionTypeNames[type];
 568 }
 569
 570 // static
 571 void NetworkChangeNotifier::NotifyDataReceived(const URLRequest& request,
 572                                                int bytes_read) {
 573   if (!g_network_change_notifier ||
 574       !g_network_change_notifier->histogram_watcher_) {
 575     return;
 576   }
 577   g_network_change_notifier->histogram_watcher_->NotifyDataReceived(request,
 578                                                                     bytes_read);
 579 }
 580
 581 // static
 582 void NetworkChangeNotifier::InitHistogramWatcher() {
 583   if (!g_network_change_notifier)
 584     return;
 585   g_network_change_notifier->histogram_watcher_.reset(new HistogramWatcher());
 586   g_network_change_notifier->histogram_watcher_->Init();
 587 }
 588
 589 // static
 590 void NetworkChangeNotifier::ShutdownHistogramWatcher() {
 591   if (!g_network_change_notifier)
 592     return;
 593   g_network_change_notifier->histogram_watcher_.reset();
 594 }
 595
 596 // static
 597 void NetworkChangeNotifier::LogOperatorCodeHistogram(ConnectionType type) {
 598 #if defined(OS_ANDROID)
 599   // On a connection type change to 2/3/4G, log the network operator MCC/MNC.
 600   // Log zero in other cases.
 601   unsigned mcc_mnc = 0;
 602   if (type == NetworkChangeNotifier::CONNECTION_2G ||
 603       type == NetworkChangeNotifier::CONNECTION_3G ||
 604       type == NetworkChangeNotifier::CONNECTION_4G) {
 605     // Log zero if not perfectly converted.
 606     if (!base::StringToUint(
 607         net::android::GetTelephonyNetworkOperator(), &mcc_mnc)) {
 608       mcc_mnc = 0;
 609     }
 610   }
 611   UMA_HISTOGRAM_SPARSE_SLOWLY("NCN.NetworkOperatorMCCMNC", mcc_mnc);
 612 #endif
 613 }
 614
 615 #if defined(OS_LINUX)
 616 // static
 617 const internal::AddressTrackerLinux*
 618 NetworkChangeNotifier::GetAddressTracker() {
 619   return g_network_change_notifier ?
 620         g_network_change_notifier->GetAddressTrackerInternal() : NULL;
 621 }
 622 #endif
 623
 624 // static
 625 bool NetworkChangeNotifier::IsOffline() {
 626    return GetConnectionType() == CONNECTION_NONE;
 627 }
 628
 629 // static
 630 bool NetworkChangeNotifier::IsConnectionCellular(ConnectionType type) {
 631   bool is_cellular = false;
 632   switch (type) {
 633     case CONNECTION_2G:
 634     case CONNECTION_3G:
 635     case CONNECTION_4G:
 636       is_cellular =  true;
 637       break;
 638     case CONNECTION_UNKNOWN:
 639     case CONNECTION_ETHERNET:
 640     case CONNECTION_WIFI:
 641     case CONNECTION_NONE:
 642     case CONNECTION_BLUETOOTH:
 643       is_cellular = false;
 644       break;
 645   }
 646   return is_cellular;
 647 }
 648
 649 // static
 650 NetworkChangeNotifier* NetworkChangeNotifier::CreateMock() {
 651   return new MockNetworkChangeNotifier();
 652 }
 653
 654 void NetworkChangeNotifier::AddIPAddressObserver(IPAddressObserver* observer) {
 655   if (g_network_change_notifier)
 656     g_network_change_notifier->ip_address_observer_list_->AddObserver(observer);
 657 }
 658
 659 void NetworkChangeNotifier::AddConnectionTypeObserver(
 660     ConnectionTypeObserver* observer) {
 661   if (g_network_change_notifier) {
 662     g_network_change_notifier->connection_type_observer_list_->AddObserver(
 663         observer);
 664   }
 665 }
 666
 667 void NetworkChangeNotifier::AddDNSObserver(DNSObserver* observer) {
 668   if (g_network_change_notifier) {
 669     g_network_change_notifier->resolver_state_observer_list_->AddObserver(
 670         observer);
 671   }
 672 }
 673
 674 void NetworkChangeNotifier::AddNetworkChangeObserver(
 675     NetworkChangeObserver* observer) {
 676   if (g_network_change_notifier) {
 677     g_network_change_notifier->network_change_observer_list_->AddObserver(
 678         observer);
 679   }
 680 }
 681
 682 void NetworkChangeNotifier::RemoveIPAddressObserver(
 683     IPAddressObserver* observer) {
 684   if (g_network_change_notifier) {
 685     g_network_change_notifier->ip_address_observer_list_->RemoveObserver(
 686         observer);
 687   }
 688 }
 689
 690 void NetworkChangeNotifier::RemoveConnectionTypeObserver(
 691     ConnectionTypeObserver* observer) {
 692   if (g_network_change_notifier) {
 693     g_network_change_notifier->connection_type_observer_list_->RemoveObserver(
 694         observer);
 695   }
 696 }
 697
 698 void NetworkChangeNotifier::RemoveDNSObserver(DNSObserver* observer) {
 699   if (g_network_change_notifier) {
 700     g_network_change_notifier->resolver_state_observer_list_->RemoveObserver(
 701         observer);
 702   }
 703 }
 704
 705 void NetworkChangeNotifier::RemoveNetworkChangeObserver(
 706     NetworkChangeObserver* observer) {
 707   if (g_network_change_notifier) {
 708     g_network_change_notifier->network_change_observer_list_->RemoveObserver(
 709         observer);
 710   }
 711 }
 712
 713 // static
 714 void NetworkChangeNotifier::NotifyObserversOfIPAddressChangeForTests() {
 715   if (g_network_change_notifier)
 716     g_network_change_notifier->NotifyObserversOfIPAddressChangeImpl();
 717 }
 718
 719 // static
 720 void NetworkChangeNotifier::NotifyObserversOfConnectionTypeChangeForTests(
 721     ConnectionType type) {
 722   if (g_network_change_notifier)
 723     g_network_change_notifier->NotifyObserversOfConnectionTypeChangeImpl(type);
 724 }
 725
 726 // static
 727 void NetworkChangeNotifier::SetTestNotificationsOnly(bool test_only) {
 728   if (g_network_change_notifier)
 729     g_network_change_notifier->test_notifications_only_ = test_only;
 730 }
 731
 732 NetworkChangeNotifier::NetworkChangeNotifier(
 733     const NetworkChangeCalculatorParams& params
 734         /*= NetworkChangeCalculatorParams()*/)
 735     : ip_address_observer_list_(
 736         new ObserverListThreadSafe<IPAddressObserver>(
 737             ObserverListBase<IPAddressObserver>::NOTIFY_EXISTING_ONLY)),
 738       connection_type_observer_list_(
 739         new ObserverListThreadSafe<ConnectionTypeObserver>(
 740             ObserverListBase<ConnectionTypeObserver>::NOTIFY_EXISTING_ONLY)),
 741       resolver_state_observer_list_(
 742         new ObserverListThreadSafe<DNSObserver>(
 743             ObserverListBase<DNSObserver>::NOTIFY_EXISTING_ONLY)),
 744       network_change_observer_list_(
 745         new ObserverListThreadSafe<NetworkChangeObserver>(
 746             ObserverListBase<NetworkChangeObserver>::NOTIFY_EXISTING_ONLY)),
 747       network_state_(new NetworkState()),
 748       network_change_calculator_(new NetworkChangeCalculator(params)),
 749       test_notifications_only_(false) {
 750   DCHECK(!g_network_change_notifier);
 751   g_network_change_notifier = this;
 752   network_change_calculator_->Init();
 753 }
 754
 755 #if defined(OS_LINUX)
 756 const internal::AddressTrackerLinux*
 757 NetworkChangeNotifier::GetAddressTrackerInternal() const {
 758   return NULL;
 759 }
 760 #endif
 761
 762 // static
 763 void NetworkChangeNotifier::NotifyObserversOfIPAddressChange() {
 764   if (g_network_change_notifier &&
 765       !g_network_change_notifier->test_notifications_only_) {
 766     g_network_change_notifier->NotifyObserversOfIPAddressChangeImpl();
 767   }
 768 }
 769
 770 // static
 771 void NetworkChangeNotifier::NotifyObserversOfConnectionTypeChange() {
 772   if (g_network_change_notifier &&
 773       !g_network_change_notifier->test_notifications_only_) {
 774     g_network_change_notifier->NotifyObserversOfConnectionTypeChangeImpl(
 775         GetConnectionType());
 776   }
 777 }
 778
 779 // static
 780 void NetworkChangeNotifier::NotifyObserversOfNetworkChange(
 781     ConnectionType type) {
 782   if (g_network_change_notifier &&
 783       !g_network_change_notifier->test_notifications_only_) {
 784     g_network_change_notifier->NotifyObserversOfNetworkChangeImpl(type);
 785   }
 786 }
 787
 788 // static
 789 void NetworkChangeNotifier::NotifyObserversOfDNSChange() {
 790   if (g_network_change_notifier &&
 791       !g_network_change_notifier->test_notifications_only_) {
 792     g_network_change_notifier->NotifyObserversOfDNSChangeImpl();
 793   }
 794 }
 795
 796 // static
 797 void NetworkChangeNotifier::SetDnsConfig(const DnsConfig& config) {
 798   if (!g_network_change_notifier)
 799     return;
 800   g_network_change_notifier->network_state_->SetDnsConfig(config);
 801   NotifyObserversOfDNSChange();
 802 }
 803
 804 void NetworkChangeNotifier::NotifyObserversOfIPAddressChangeImpl() {
 805   ip_address_observer_list_->Notify(&IPAddressObserver::OnIPAddressChanged);
 806 }
 807
 808 void NetworkChangeNotifier::NotifyObserversOfConnectionTypeChangeImpl(
 809     ConnectionType type) {
 810   connection_type_observer_list_->Notify(
 811       &ConnectionTypeObserver::OnConnectionTypeChanged, type);
 812 }
 813
 814 void NetworkChangeNotifier::NotifyObserversOfNetworkChangeImpl(
 815     ConnectionType type) {
 816   network_change_observer_list_->Notify(
 817       &NetworkChangeObserver::OnNetworkChanged, type);
 818 }
 819
 820 void NetworkChangeNotifier::NotifyObserversOfDNSChangeImpl() {
 821   resolver_state_observer_list_->Notify(&DNSObserver::OnDNSChanged);
 822 }
 823
 824 NetworkChangeNotifier::DisableForTest::DisableForTest()
 825     : network_change_notifier_(g_network_change_notifier) {
 826   DCHECK(g_network_change_notifier);
 827   g_network_change_notifier = NULL;
 828 }
 829
 830 NetworkChangeNotifier::DisableForTest::~DisableForTest() {
 831   DCHECK(!g_network_change_notifier);
 832   g_network_change_notifier = network_change_notifier_;
 833 }
 834
 835 }  // namespace net