src/net/http/http_server_properties_manager.cc

   1 // Copyright 2014 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/http/http_server_properties_manager.h"
   6
   7 #include "base/bind.h"
   8 #include "base/metrics/histogram.h"
   9 #include "base/prefs/pref_service.h"
  10 #include "base/rand_util.h"
  11 #include "base/single_thread_task_runner.h"
  12 #include "base/stl_util.h"
  13 #include "base/strings/string_number_conversions.h"
  14 #include "base/strings/stringprintf.h"
  15 #include "base/thread_task_runner_handle.h"
  16 #include "base/values.h"
  17
  18 namespace net {
  19
  20 namespace {
  21
  22 // Time to wait before starting an update the http_server_properties_impl_ cache
  23 // from preferences. Scheduling another update during this period will reset the
  24 // timer.
  25 const int64 kUpdateCacheDelayMs = 1000;
  26
  27 // Time to wait before starting an update the preferences from the
  28 // http_server_properties_impl_ cache. Scheduling another update during this
  29 // period will reset the timer.
  30 const int64 kUpdatePrefsDelayMs = 5000;
  31
  32 // "version" 0 indicates, http_server_properties doesn't have "version"
  33 // property.
  34 const int kMissingVersion = 0;
  35
  36 // The version number of persisted http_server_properties.
  37 const int kVersionNumber = 3;
  38
  39 typedef std::vector<std::string> StringVector;
  40
  41 // Load either 200 or 1000 servers based on a coin flip.
  42 const int k200AlternateProtocolHostsToLoad = 200;
  43 const int k1000AlternateProtocolHostsToLoad = 1000;
  44 // Persist 1000 MRU AlternateProtocolHostPortPairs.
  45 const int kMaxAlternateProtocolHostsToPersist = 1000;
  46
  47 // Persist 200 MRU SpdySettingsHostPortPairs.
  48 const int kMaxSpdySettingsHostsToPersist = 200;
  49
  50 // Persist 300 MRU SupportsSpdyServerHostPortPairs.
  51 const int kMaxSupportsSpdyServerHostsToPersist = 300;
  52
  53 }  // namespace
  54
  55 ////////////////////////////////////////////////////////////////////////////////
  56 //  HttpServerPropertiesManager
  57
  58 HttpServerPropertiesManager::HttpServerPropertiesManager(
  59     PrefService* pref_service,
  60     const char* pref_path,
  61     scoped_refptr<base::SequencedTaskRunner> network_task_runner)
  62     : pref_task_runner_(base::ThreadTaskRunnerHandle::Get()),
  63       pref_service_(pref_service),
  64       setting_prefs_(false),
  65       path_(pref_path),
  66       network_task_runner_(network_task_runner) {
  67   DCHECK(pref_service);
  68   pref_weak_ptr_factory_.reset(
  69       new base::WeakPtrFactory<HttpServerPropertiesManager>(this));
  70   pref_weak_ptr_ = pref_weak_ptr_factory_->GetWeakPtr();
  71   pref_cache_update_timer_.reset(
  72       new base::OneShotTimer<HttpServerPropertiesManager>);
  73   pref_change_registrar_.Init(pref_service_);
  74   pref_change_registrar_.Add(
  75       path_,
  76       base::Bind(&HttpServerPropertiesManager::OnHttpServerPropertiesChanged,
  77                  base::Unretained(this)));
  78 }
  79
  80 HttpServerPropertiesManager::~HttpServerPropertiesManager() {
  81   DCHECK(network_task_runner_->RunsTasksOnCurrentThread());
  82   network_weak_ptr_factory_.reset();
  83 }
  84
  85 void HttpServerPropertiesManager::InitializeOnNetworkThread() {
  86   DCHECK(network_task_runner_->RunsTasksOnCurrentThread());
  87   network_weak_ptr_factory_.reset(
  88       new base::WeakPtrFactory<HttpServerPropertiesManager>(this));
  89   http_server_properties_impl_.reset(new net::HttpServerPropertiesImpl());
  90
  91   network_prefs_update_timer_.reset(
  92       new base::OneShotTimer<HttpServerPropertiesManager>);
  93
  94   pref_task_runner_->PostTask(
  95       FROM_HERE,
  96       base::Bind(&HttpServerPropertiesManager::UpdateCacheFromPrefsOnPrefThread,
  97                  pref_weak_ptr_));
  98 }
  99
 100 void HttpServerPropertiesManager::ShutdownOnPrefThread() {
 101   DCHECK(pref_task_runner_->RunsTasksOnCurrentThread());
 102   // Cancel any pending updates, and stop listening for pref change updates.
 103   pref_cache_update_timer_->Stop();
 104   pref_weak_ptr_factory_.reset();
 105   pref_change_registrar_.RemoveAll();
 106 }
 107
 108 // static
 109 void HttpServerPropertiesManager::SetVersion(
 110     base::DictionaryValue* http_server_properties_dict,
 111     int version_number) {
 112   if (version_number < 0)
 113     version_number = kVersionNumber;
 114   DCHECK_LE(version_number, kVersionNumber);
 115   if (version_number <= kVersionNumber)
 116     http_server_properties_dict->SetInteger("version", version_number);
 117 }
 118
 119 // This is required for conformance with the HttpServerProperties interface.
 120 base::WeakPtr<net::HttpServerProperties>
 121 HttpServerPropertiesManager::GetWeakPtr() {
 122   DCHECK(network_task_runner_->RunsTasksOnCurrentThread());
 123   return network_weak_ptr_factory_->GetWeakPtr();
 124 }
 125
 126 void HttpServerPropertiesManager::Clear() {
 127   Clear(base::Closure());
 128 }
 129
 130 void HttpServerPropertiesManager::Clear(const base::Closure& completion) {
 131   DCHECK(network_task_runner_->RunsTasksOnCurrentThread());
 132
 133   http_server_properties_impl_->Clear();
 134   UpdatePrefsFromCacheOnNetworkThread(completion);
 135 }
 136
 137 bool HttpServerPropertiesManager::SupportsSpdy(
 138     const net::HostPortPair& server) {
 139   DCHECK(network_task_runner_->RunsTasksOnCurrentThread());
 140   return http_server_properties_impl_->SupportsSpdy(server);
 141 }
 142
 143 void HttpServerPropertiesManager::SetSupportsSpdy(
 144     const net::HostPortPair& server,
 145     bool support_spdy) {
 146   DCHECK(network_task_runner_->RunsTasksOnCurrentThread());
 147
 148   http_server_properties_impl_->SetSupportsSpdy(server, support_spdy);
 149   ScheduleUpdatePrefsOnNetworkThread();
 150 }
 151
 152 bool HttpServerPropertiesManager::HasAlternateProtocol(
 153     const net::HostPortPair& server) {
 154   DCHECK(network_task_runner_->RunsTasksOnCurrentThread());
 155   return http_server_properties_impl_->HasAlternateProtocol(server);
 156 }
 157
 158 net::AlternateProtocolInfo
 159 HttpServerPropertiesManager::GetAlternateProtocol(
 160     const net::HostPortPair& server) {
 161   DCHECK(network_task_runner_->RunsTasksOnCurrentThread());
 162   return http_server_properties_impl_->GetAlternateProtocol(server);
 163 }
 164
 165 void HttpServerPropertiesManager::SetAlternateProtocol(
 166     const net::HostPortPair& server,
 167     uint16 alternate_port,
 168     AlternateProtocol alternate_protocol,
 169     double alternate_probability) {
 170   DCHECK(network_task_runner_->RunsTasksOnCurrentThread());
 171   http_server_properties_impl_->SetAlternateProtocol(
 172       server, alternate_port, alternate_protocol, alternate_probability);
 173   ScheduleUpdatePrefsOnNetworkThread();
 174 }
 175
 176 void HttpServerPropertiesManager::SetBrokenAlternateProtocol(
 177     const net::HostPortPair& server) {
 178   DCHECK(network_task_runner_->RunsTasksOnCurrentThread());
 179   http_server_properties_impl_->SetBrokenAlternateProtocol(server);
 180   ScheduleUpdatePrefsOnNetworkThread();
 181 }
 182
 183 bool HttpServerPropertiesManager::WasAlternateProtocolRecentlyBroken(
 184     const net::HostPortPair& server) {
 185   DCHECK(network_task_runner_->RunsTasksOnCurrentThread());
 186   return http_server_properties_impl_->WasAlternateProtocolRecentlyBroken(
 187       server);
 188 }
 189
 190 void HttpServerPropertiesManager::ConfirmAlternateProtocol(
 191     const net::HostPortPair& server) {
 192   DCHECK(network_task_runner_->RunsTasksOnCurrentThread());
 193   http_server_properties_impl_->ConfirmAlternateProtocol(server);
 194   ScheduleUpdatePrefsOnNetworkThread();
 195 }
 196
 197 void HttpServerPropertiesManager::ClearAlternateProtocol(
 198     const net::HostPortPair& server) {
 199   DCHECK(network_task_runner_->RunsTasksOnCurrentThread());
 200   http_server_properties_impl_->ClearAlternateProtocol(server);
 201   ScheduleUpdatePrefsOnNetworkThread();
 202 }
 203
 204 const net::AlternateProtocolMap&
 205 HttpServerPropertiesManager::alternate_protocol_map() const {
 206   DCHECK(network_task_runner_->RunsTasksOnCurrentThread());
 207   return http_server_properties_impl_->alternate_protocol_map();
 208 }
 209
 210 void HttpServerPropertiesManager::SetAlternateProtocolExperiment(
 211     AlternateProtocolExperiment experiment) {
 212   DCHECK(network_task_runner_->RunsTasksOnCurrentThread());
 213   http_server_properties_impl_->SetAlternateProtocolExperiment(experiment);
 214 }
 215
 216 void HttpServerPropertiesManager::SetAlternateProtocolProbabilityThreshold(
 217     double threshold) {
 218   DCHECK(network_task_runner_->RunsTasksOnCurrentThread());
 219   http_server_properties_impl_->SetAlternateProtocolProbabilityThreshold(
 220       threshold);
 221 }
 222
 223 AlternateProtocolExperiment
 224 HttpServerPropertiesManager::GetAlternateProtocolExperiment() const {
 225   DCHECK(network_task_runner_->RunsTasksOnCurrentThread());
 226   return http_server_properties_impl_->GetAlternateProtocolExperiment();
 227 }
 228
 229 const SettingsMap& HttpServerPropertiesManager::GetSpdySettings(
 230     const HostPortPair& host_port_pair) {
 231   DCHECK(network_task_runner_->RunsTasksOnCurrentThread());
 232   return http_server_properties_impl_->GetSpdySettings(host_port_pair);
 233 }
 234
 235 bool HttpServerPropertiesManager::SetSpdySetting(
 236     const HostPortPair& host_port_pair,
 237     SpdySettingsIds id,
 238     SpdySettingsFlags flags,
 239     uint32 value) {
 240   DCHECK(network_task_runner_->RunsTasksOnCurrentThread());
 241   bool persist = http_server_properties_impl_->SetSpdySetting(
 242       host_port_pair, id, flags, value);
 243   if (persist)
 244     ScheduleUpdatePrefsOnNetworkThread();
 245   return persist;
 246 }
 247
 248 void HttpServerPropertiesManager::ClearSpdySettings(
 249     const HostPortPair& host_port_pair) {
 250   DCHECK(network_task_runner_->RunsTasksOnCurrentThread());
 251   http_server_properties_impl_->ClearSpdySettings(host_port_pair);
 252   ScheduleUpdatePrefsOnNetworkThread();
 253 }
 254
 255 void HttpServerPropertiesManager::ClearAllSpdySettings() {
 256   DCHECK(network_task_runner_->RunsTasksOnCurrentThread());
 257   http_server_properties_impl_->ClearAllSpdySettings();
 258   ScheduleUpdatePrefsOnNetworkThread();
 259 }
 260
 261 const SpdySettingsMap& HttpServerPropertiesManager::spdy_settings_map()
 262     const {
 263   DCHECK(network_task_runner_->RunsTasksOnCurrentThread());
 264   return http_server_properties_impl_->spdy_settings_map();
 265 }
 266
 267 void HttpServerPropertiesManager::SetServerNetworkStats(
 268     const net::HostPortPair& host_port_pair,
 269     NetworkStats stats) {
 270   DCHECK(network_task_runner_->RunsTasksOnCurrentThread());
 271   http_server_properties_impl_->SetServerNetworkStats(host_port_pair, stats);
 272 }
 273
 274 const HttpServerPropertiesManager::NetworkStats*
 275 HttpServerPropertiesManager::GetServerNetworkStats(
 276     const net::HostPortPair& host_port_pair) const {
 277   DCHECK(network_task_runner_->RunsTasksOnCurrentThread());
 278   return http_server_properties_impl_->GetServerNetworkStats(host_port_pair);
 279 }
 280
 281 //
 282 // Update the HttpServerPropertiesImpl's cache with data from preferences.
 283 //
 284 void HttpServerPropertiesManager::ScheduleUpdateCacheOnPrefThread() {
 285   DCHECK(pref_task_runner_->RunsTasksOnCurrentThread());
 286   // Cancel pending updates, if any.
 287   pref_cache_update_timer_->Stop();
 288   StartCacheUpdateTimerOnPrefThread(
 289       base::TimeDelta::FromMilliseconds(kUpdateCacheDelayMs));
 290 }
 291
 292 void HttpServerPropertiesManager::StartCacheUpdateTimerOnPrefThread(
 293     base::TimeDelta delay) {
 294   DCHECK(pref_task_runner_->RunsTasksOnCurrentThread());
 295   pref_cache_update_timer_->Start(
 296       FROM_HERE,
 297       delay,
 298       this,
 299       &HttpServerPropertiesManager::UpdateCacheFromPrefsOnPrefThread);
 300 }
 301
 302 void HttpServerPropertiesManager::UpdateCacheFromPrefsOnPrefThread() {
 303   // The preferences can only be read on the pref thread.
 304   DCHECK(pref_task_runner_->RunsTasksOnCurrentThread());
 305
 306   if (!pref_service_->HasPrefPath(path_))
 307     return;
 308
 309   bool detected_corrupted_prefs = false;
 310   const base::DictionaryValue& http_server_properties_dict =
 311       *pref_service_->GetDictionary(path_);
 312
 313   int version = kMissingVersion;
 314   if (!http_server_properties_dict.GetIntegerWithoutPathExpansion("version",
 315                                                                   &version)) {
 316     DVLOG(1) << "Missing version. Clearing all properties.";
 317     return;
 318   }
 319
 320   // The properties for a given server is in
 321   // http_server_properties_dict["servers"][server].
 322   const base::DictionaryValue* servers_dict = NULL;
 323   if (!http_server_properties_dict.GetDictionaryWithoutPathExpansion(
 324           "servers", &servers_dict)) {
 325     DVLOG(1) << "Malformed http_server_properties for servers.";
 326     return;
 327   }
 328
 329   // String is host/port pair of spdy server.
 330   scoped_ptr<StringVector> spdy_servers(new StringVector);
 331   scoped_ptr<net::SpdySettingsMap> spdy_settings_map(
 332       new net::SpdySettingsMap(kMaxSpdySettingsHostsToPersist));
 333   scoped_ptr<net::AlternateProtocolMap> alternate_protocol_map(
 334       new net::AlternateProtocolMap(kMaxAlternateProtocolHostsToPersist));
 335   // TODO(rtenneti): Delete the following code after the experiment.
 336   int alternate_protocols_to_load = k200AlternateProtocolHostsToLoad;
 337   net::AlternateProtocolExperiment alternate_protocol_experiment =
 338       net::ALTERNATE_PROTOCOL_NOT_PART_OF_EXPERIMENT;
 339   if (version == kVersionNumber) {
 340     if (base::RandInt(0, 99) == 0) {
 341       alternate_protocol_experiment =
 342           net::ALTERNATE_PROTOCOL_TRUNCATED_200_SERVERS;
 343     } else {
 344       alternate_protocols_to_load = k1000AlternateProtocolHostsToLoad;
 345       alternate_protocol_experiment =
 346           net::ALTERNATE_PROTOCOL_TRUNCATED_1000_SERVERS;
 347     }
 348     DVLOG(1) << "# of servers that support alternate_protocol: "
 349              << alternate_protocols_to_load;
 350   }
 351
 352   int count = 0;
 353   for (base::DictionaryValue::Iterator it(*servers_dict); !it.IsAtEnd();
 354        it.Advance()) {
 355     // Get server's host/pair.
 356     const std::string& server_str = it.key();
 357     net::HostPortPair server = net::HostPortPair::FromString(server_str);
 358     if (server.host().empty()) {
 359       DVLOG(1) << "Malformed http_server_properties for server: " << server_str;
 360       detected_corrupted_prefs = true;
 361       continue;
 362     }
 363
 364     const base::DictionaryValue* server_pref_dict = NULL;
 365     if (!it.value().GetAsDictionary(&server_pref_dict)) {
 366       DVLOG(1) << "Malformed http_server_properties server: " << server_str;
 367       detected_corrupted_prefs = true;
 368       continue;
 369     }
 370
 371     // Get if server supports Spdy.
 372     bool supports_spdy = false;
 373     if ((server_pref_dict->GetBoolean("supports_spdy", &supports_spdy)) &&
 374         supports_spdy) {
 375       spdy_servers->push_back(server_str);
 376     }
 377
 378     // Get SpdySettings.
 379     DCHECK(spdy_settings_map->Peek(server) == spdy_settings_map->end());
 380     const base::DictionaryValue* spdy_settings_dict = NULL;
 381     if (server_pref_dict->GetDictionaryWithoutPathExpansion(
 382             "settings", &spdy_settings_dict)) {
 383       net::SettingsMap settings_map;
 384       for (base::DictionaryValue::Iterator dict_it(*spdy_settings_dict);
 385            !dict_it.IsAtEnd();
 386            dict_it.Advance()) {
 387         const std::string& id_str = dict_it.key();
 388         int id = 0;
 389         if (!base::StringToInt(id_str, &id)) {
 390           DVLOG(1) << "Malformed id in SpdySettings for server: " << server_str;
 391           NOTREACHED();
 392           continue;
 393         }
 394         int value = 0;
 395         if (!dict_it.value().GetAsInteger(&value)) {
 396           DVLOG(1) << "Malformed value in SpdySettings for server: "
 397                    << server_str;
 398           NOTREACHED();
 399           continue;
 400         }
 401         net::SettingsFlagsAndValue flags_and_value(net::SETTINGS_FLAG_PERSISTED,
 402                                                    value);
 403         settings_map[static_cast<net::SpdySettingsIds>(id)] = flags_and_value;
 404       }
 405       spdy_settings_map->Put(server, settings_map);
 406     }
 407
 408     // Get alternate_protocol server.
 409     DCHECK(alternate_protocol_map->Peek(server) ==
 410            alternate_protocol_map->end());
 411     const base::DictionaryValue* port_alternate_protocol_dict = NULL;
 412     if (!server_pref_dict->GetDictionaryWithoutPathExpansion(
 413             "alternate_protocol", &port_alternate_protocol_dict)) {
 414       continue;
 415     }
 416
 417     if (count >= alternate_protocols_to_load)
 418       continue;
 419     do {
 420       int port = 0;
 421       if (!port_alternate_protocol_dict->GetIntegerWithoutPathExpansion(
 422               "port", &port) ||
 423           (port > (1 << 16))) {
 424         DVLOG(1) << "Malformed Alternate-Protocol server: " << server_str;
 425         detected_corrupted_prefs = true;
 426         continue;
 427       }
 428       std::string protocol_str;
 429       if (!port_alternate_protocol_dict->GetStringWithoutPathExpansion(
 430               "protocol_str", &protocol_str)) {
 431         DVLOG(1) << "Malformed Alternate-Protocol server: " << server_str;
 432         detected_corrupted_prefs = true;
 433         continue;
 434       }
 435       net::AlternateProtocol protocol =
 436           net::AlternateProtocolFromString(protocol_str);
 437       if (!net::IsAlternateProtocolValid(protocol)) {
 438         DVLOG(1) << "Malformed Alternate-Protocol server: " << server_str;
 439         detected_corrupted_prefs = true;
 440         continue;
 441       }
 442
 443       double probability = 1;
 444       if (port_alternate_protocol_dict->HasKey("probability") &&
 445           !port_alternate_protocol_dict->GetDoubleWithoutPathExpansion(
 446               "probability", &probability)) {
 447         DVLOG(1) << "Malformed Alternate-Protocol server: " << server_str;
 448         detected_corrupted_prefs = true;
 449         continue;
 450       }
 451
 452       net::AlternateProtocolInfo port_alternate_protocol(port,
 453                                                          protocol,
 454                                                          probability);
 455       alternate_protocol_map->Put(server, port_alternate_protocol);
 456       ++count;
 457     } while (false);
 458   }
 459
 460   network_task_runner_->PostTask(
 461       FROM_HERE,
 462       base::Bind(
 463           &HttpServerPropertiesManager::UpdateCacheFromPrefsOnNetworkThread,
 464           base::Unretained(this),
 465           base::Owned(spdy_servers.release()),
 466           base::Owned(spdy_settings_map.release()),
 467           base::Owned(alternate_protocol_map.release()),
 468           alternate_protocol_experiment,
 469           detected_corrupted_prefs));
 470 }
 471
 472 void HttpServerPropertiesManager::UpdateCacheFromPrefsOnNetworkThread(
 473     StringVector* spdy_servers,
 474     net::SpdySettingsMap* spdy_settings_map,
 475     net::AlternateProtocolMap* alternate_protocol_map,
 476     net::AlternateProtocolExperiment alternate_protocol_experiment,
 477     bool detected_corrupted_prefs) {
 478   // Preferences have the master data because admins might have pushed new
 479   // preferences. Update the cached data with new data from preferences.
 480   DCHECK(network_task_runner_->RunsTasksOnCurrentThread());
 481
 482   UMA_HISTOGRAM_COUNTS("Net.CountOfSpdyServers", spdy_servers->size());
 483   http_server_properties_impl_->InitializeSpdyServers(spdy_servers, true);
 484
 485   // Update the cached data and use the new spdy_settings from preferences.
 486   UMA_HISTOGRAM_COUNTS("Net.CountOfSpdySettings", spdy_settings_map->size());
 487   http_server_properties_impl_->InitializeSpdySettingsServers(
 488       spdy_settings_map);
 489
 490   // Update the cached data and use the new Alternate-Protocol server list from
 491   // preferences.
 492   UMA_HISTOGRAM_COUNTS("Net.CountOfAlternateProtocolServers",
 493                        alternate_protocol_map->size());
 494   http_server_properties_impl_->InitializeAlternateProtocolServers(
 495       alternate_protocol_map);
 496   http_server_properties_impl_->SetAlternateProtocolExperiment(
 497       alternate_protocol_experiment);
 498
 499   // Update the prefs with what we have read (delete all corrupted prefs).
 500   if (detected_corrupted_prefs)
 501     ScheduleUpdatePrefsOnNetworkThread();
 502 }
 503
 504 //
 505 // Update Preferences with data from the cached data.
 506 //
 507 void HttpServerPropertiesManager::ScheduleUpdatePrefsOnNetworkThread() {
 508   DCHECK(network_task_runner_->RunsTasksOnCurrentThread());
 509   // Cancel pending updates, if any.
 510   network_prefs_update_timer_->Stop();
 511   StartPrefsUpdateTimerOnNetworkThread(
 512       base::TimeDelta::FromMilliseconds(kUpdatePrefsDelayMs));
 513 }
 514
 515 void HttpServerPropertiesManager::StartPrefsUpdateTimerOnNetworkThread(
 516     base::TimeDelta delay) {
 517   DCHECK(network_task_runner_->RunsTasksOnCurrentThread());
 518   // This is overridden in tests to post the task without the delay.
 519   network_prefs_update_timer_->Start(
 520       FROM_HERE,
 521       delay,
 522       this,
 523       &HttpServerPropertiesManager::UpdatePrefsFromCacheOnNetworkThread);
 524 }
 525
 526 // This is required so we can set this as the callback for a timer.
 527 void HttpServerPropertiesManager::UpdatePrefsFromCacheOnNetworkThread() {
 528   UpdatePrefsFromCacheOnNetworkThread(base::Closure());
 529 }
 530
 531 void HttpServerPropertiesManager::UpdatePrefsFromCacheOnNetworkThread(
 532     const base::Closure& completion) {
 533   DCHECK(network_task_runner_->RunsTasksOnCurrentThread());
 534
 535   base::ListValue* spdy_server_list = new base::ListValue;
 536   http_server_properties_impl_->GetSpdyServerList(
 537       spdy_server_list, kMaxSupportsSpdyServerHostsToPersist);
 538
 539   net::SpdySettingsMap* spdy_settings_map =
 540       new net::SpdySettingsMap(kMaxSpdySettingsHostsToPersist);
 541   const net::SpdySettingsMap& main_map =
 542       http_server_properties_impl_->spdy_settings_map();
 543   int count = 0;
 544   for (net::SpdySettingsMap::const_iterator it = main_map.begin();
 545        it != main_map.end() && count < kMaxSpdySettingsHostsToPersist;
 546        ++it, ++count) {
 547     spdy_settings_map->Put(it->first, it->second);
 548   }
 549
 550   net::AlternateProtocolMap* alternate_protocol_map =
 551       new net::AlternateProtocolMap(kMaxAlternateProtocolHostsToPersist);
 552   const net::AlternateProtocolMap& map =
 553       http_server_properties_impl_->alternate_protocol_map();
 554   count = 0;
 555   typedef std::map<std::string, bool> CanonicalHostPersistedMap;
 556   CanonicalHostPersistedMap persisted_map;
 557   for (net::AlternateProtocolMap::const_iterator it = map.begin();
 558        it != map.end() && count < kMaxAlternateProtocolHostsToPersist;
 559        ++it) {
 560     const net::HostPortPair& server = it->first;
 561     std::string canonical_suffix =
 562         http_server_properties_impl_->GetCanonicalSuffix(server);
 563     if (!canonical_suffix.empty()) {
 564       if (persisted_map.find(canonical_suffix) != persisted_map.end())
 565         continue;
 566       persisted_map[canonical_suffix] = true;
 567     }
 568     alternate_protocol_map->Put(server, it->second);
 569     ++count;
 570   }
 571
 572   // Update the preferences on the pref thread.
 573   pref_task_runner_->PostTask(
 574       FROM_HERE,
 575       base::Bind(&HttpServerPropertiesManager::UpdatePrefsOnPrefThread,
 576                  pref_weak_ptr_,
 577                  base::Owned(spdy_server_list),
 578                  base::Owned(spdy_settings_map),
 579                  base::Owned(alternate_protocol_map),
 580                  completion));
 581 }
 582
 583 // A local or temporary data structure to hold |supports_spdy|, SpdySettings,
 584 // and AlternateProtocolInfo preferences for a server. This is used only in
 585 // UpdatePrefsOnPrefThread.
 586 struct ServerPref {
 587   ServerPref()
 588       : supports_spdy(false), settings_map(NULL), alternate_protocol(NULL) {}
 589   ServerPref(bool supports_spdy,
 590              const net::SettingsMap* settings_map,
 591              const net::AlternateProtocolInfo* alternate_protocol)
 592       : supports_spdy(supports_spdy),
 593         settings_map(settings_map),
 594         alternate_protocol(alternate_protocol) {}
 595   bool supports_spdy;
 596   const net::SettingsMap* settings_map;
 597   const net::AlternateProtocolInfo* alternate_protocol;
 598 };
 599
 600 void HttpServerPropertiesManager::UpdatePrefsOnPrefThread(
 601     base::ListValue* spdy_server_list,
 602     net::SpdySettingsMap* spdy_settings_map,
 603     net::AlternateProtocolMap* alternate_protocol_map,
 604     const base::Closure& completion) {
 605   typedef std::map<net::HostPortPair, ServerPref> ServerPrefMap;
 606   ServerPrefMap server_pref_map;
 607
 608   DCHECK(pref_task_runner_->RunsTasksOnCurrentThread());
 609
 610   // Add servers that support spdy to server_pref_map.
 611   std::string s;
 612   for (base::ListValue::const_iterator list_it = spdy_server_list->begin();
 613        list_it != spdy_server_list->end();
 614        ++list_it) {
 615     if ((*list_it)->GetAsString(&s)) {
 616       net::HostPortPair server = net::HostPortPair::FromString(s);
 617
 618       ServerPrefMap::iterator it = server_pref_map.find(server);
 619       if (it == server_pref_map.end()) {
 620         ServerPref server_pref(true, NULL, NULL);
 621         server_pref_map[server] = server_pref;
 622       } else {
 623         it->second.supports_spdy = true;
 624       }
 625     }
 626   }
 627
 628   // Add servers that have SpdySettings to server_pref_map.
 629   for (net::SpdySettingsMap::iterator map_it = spdy_settings_map->begin();
 630        map_it != spdy_settings_map->end();
 631        ++map_it) {
 632     const net::HostPortPair& server = map_it->first;
 633
 634     ServerPrefMap::iterator it = server_pref_map.find(server);
 635     if (it == server_pref_map.end()) {
 636       ServerPref server_pref(false, &map_it->second, NULL);
 637       server_pref_map[server] = server_pref;
 638     } else {
 639       it->second.settings_map = &map_it->second;
 640     }
 641   }
 642
 643   // Add AlternateProtocol servers to server_pref_map.
 644   for (net::AlternateProtocolMap::const_iterator map_it =
 645            alternate_protocol_map->begin();
 646        map_it != alternate_protocol_map->end();
 647        ++map_it) {
 648     const net::HostPortPair& server = map_it->first;
 649     const net::AlternateProtocolInfo& port_alternate_protocol =
 650         map_it->second;
 651     if (!net::IsAlternateProtocolValid(port_alternate_protocol.protocol)) {
 652       continue;
 653     }
 654
 655     ServerPrefMap::iterator it = server_pref_map.find(server);
 656     if (it == server_pref_map.end()) {
 657       ServerPref server_pref(false, NULL, &map_it->second);
 658       server_pref_map[server] = server_pref;
 659     } else {
 660       it->second.alternate_protocol = &map_it->second;
 661     }
 662   }
 663
 664   // Persist properties to the |path_|.
 665   base::DictionaryValue http_server_properties_dict;
 666   base::DictionaryValue* servers_dict = new base::DictionaryValue;
 667   for (ServerPrefMap::const_iterator map_it = server_pref_map.begin();
 668        map_it != server_pref_map.end();
 669        ++map_it) {
 670     const net::HostPortPair& server = map_it->first;
 671     const ServerPref& server_pref = map_it->second;
 672
 673     base::DictionaryValue* server_pref_dict = new base::DictionaryValue;
 674
 675     // Save supports_spdy.
 676     if (server_pref.supports_spdy)
 677       server_pref_dict->SetBoolean("supports_spdy", server_pref.supports_spdy);
 678
 679     // Save SPDY settings.
 680     if (server_pref.settings_map) {
 681       base::DictionaryValue* spdy_settings_dict = new base::DictionaryValue;
 682       for (net::SettingsMap::const_iterator it =
 683                server_pref.settings_map->begin();
 684            it != server_pref.settings_map->end();
 685            ++it) {
 686         net::SpdySettingsIds id = it->first;
 687         uint32 value = it->second.second;
 688         std::string key = base::StringPrintf("%u", id);
 689         spdy_settings_dict->SetInteger(key, value);
 690       }
 691       server_pref_dict->SetWithoutPathExpansion("settings", spdy_settings_dict);
 692     }
 693
 694     // Save alternate_protocol.
 695     if (server_pref.alternate_protocol) {
 696       base::DictionaryValue* port_alternate_protocol_dict =
 697           new base::DictionaryValue;
 698       const net::AlternateProtocolInfo* port_alternate_protocol =
 699           server_pref.alternate_protocol;
 700       port_alternate_protocol_dict->SetInteger("port",
 701                                                port_alternate_protocol->port);
 702       const char* protocol_str =
 703           net::AlternateProtocolToString(port_alternate_protocol->protocol);
 704       port_alternate_protocol_dict->SetString("protocol_str", protocol_str);
 705       port_alternate_protocol_dict->SetDouble(
 706           "probability", port_alternate_protocol->probability);
 707       server_pref_dict->SetWithoutPathExpansion(
 708           "alternate_protocol", port_alternate_protocol_dict);
 709     }
 710
 711     servers_dict->SetWithoutPathExpansion(server.ToString(), server_pref_dict);
 712   }
 713
 714   http_server_properties_dict.SetWithoutPathExpansion("servers", servers_dict);
 715   SetVersion(&http_server_properties_dict, kVersionNumber);
 716   setting_prefs_ = true;
 717   pref_service_->Set(path_, http_server_properties_dict);
 718   setting_prefs_ = false;
 719
 720   // Note that |completion| will be fired after we have written everything to
 721   // the Preferences, but likely before these changes are serialized to disk.
 722   // This is not a problem though, as JSONPrefStore guarantees that this will
 723   // happen, pretty soon, and even in the case we shut down immediately.
 724   if (!completion.is_null())
 725     completion.Run();
 726 }
 727
 728 void HttpServerPropertiesManager::OnHttpServerPropertiesChanged() {
 729   DCHECK(pref_task_runner_->RunsTasksOnCurrentThread());
 730   if (!setting_prefs_)
 731     ScheduleUpdateCacheOnPrefThread();
 732 }
 733
 734 }  // namespace net