net/socket/transport_client_socket_pool.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/socket/transport_client_socket_pool.h"
   6
   7 #include <algorithm>
   8
   9 #include "base/compiler_specific.h"
  10 #include "base/lazy_instance.h"
  11 #include "base/logging.h"
  12 #include "base/message_loop/message_loop.h"
  13 #include "base/metrics/histogram_macros.h"
  14 #include "base/profiler/scoped_tracker.h"
  15 #include "base/strings/string_util.h"
  16 #include "base/synchronization/lock.h"
  17 #include "base/time/time.h"
  18 #include "base/values.h"
  19 #include "net/base/ip_endpoint.h"
  20 #include "net/base/net_errors.h"
  21 #include "net/log/net_log.h"
  22 #include "net/socket/client_socket_factory.h"
  23 #include "net/socket/client_socket_handle.h"
  24 #include "net/socket/client_socket_pool_base.h"
  25 #include "net/socket/socket_net_log_params.h"
  26 #include "net/socket/tcp_client_socket.h"
  27
  28 using base::TimeDelta;
  29
  30 namespace net {
  31
  32 // TODO(willchan): Base this off RTT instead of statically setting it. Note we
  33 // choose a timeout that is different from the backup connect job timer so they
  34 // don't synchronize.
  35 const int TransportConnectJobHelper::kIPv6FallbackTimerInMs = 300;
  36
  37 namespace {
  38
  39 // Returns true iff all addresses in |list| are in the IPv6 family.
  40 bool AddressListOnlyContainsIPv6(const AddressList& list) {
  41   DCHECK(!list.empty());
  42   for (AddressList::const_iterator iter = list.begin(); iter != list.end();
  43        ++iter) {
  44     if (iter->GetFamily() != ADDRESS_FAMILY_IPV6)
  45       return false;
  46   }
  47   return true;
  48 }
  49
  50 }  // namespace
  51
  52 // This lock protects |g_last_connect_time|.
  53 static base::LazyInstance<base::Lock>::Leaky
  54     g_last_connect_time_lock = LAZY_INSTANCE_INITIALIZER;
  55
  56 // |g_last_connect_time| has the last time a connect() call is made.
  57 static base::LazyInstance<base::TimeTicks>::Leaky
  58     g_last_connect_time = LAZY_INSTANCE_INITIALIZER;
  59
  60 TransportSocketParams::TransportSocketParams(
  61     const HostPortPair& host_port_pair,
  62     bool disable_resolver_cache,
  63     bool ignore_limits,
  64     const OnHostResolutionCallback& host_resolution_callback,
  65     CombineConnectAndWritePolicy combine_connect_and_write_if_supported)
  66     : destination_(host_port_pair),
  67       ignore_limits_(ignore_limits),
  68       host_resolution_callback_(host_resolution_callback),
  69       combine_connect_and_write_(combine_connect_and_write_if_supported) {
  70   if (disable_resolver_cache)
  71     destination_.set_allow_cached_response(false);
  72   // combine_connect_and_write currently translates to TCP FastOpen.
  73   // Enable TCP FastOpen if user wants it.
  74   if (combine_connect_and_write_ == COMBINE_CONNECT_AND_WRITE_DEFAULT) {
  75     IsTCPFastOpenUserEnabled() ? combine_connect_and_write_ =
  76         COMBINE_CONNECT_AND_WRITE_DESIRED :
  77         COMBINE_CONNECT_AND_WRITE_PROHIBITED;
  78   }
  79 }
  80
  81 TransportSocketParams::~TransportSocketParams() {}
  82
  83 // TransportConnectJobs will time out after this many seconds.  Note this is
  84 // the total time, including both host resolution and TCP connect() times.
  85 //
  86 // TODO(eroman): The use of this constant needs to be re-evaluated. The time
  87 // needed for TCPClientSocketXXX::Connect() can be arbitrarily long, since
  88 // the address list may contain many alternatives, and most of those may
  89 // timeout. Even worse, the per-connect timeout threshold varies greatly
  90 // between systems (anywhere from 20 seconds to 190 seconds).
  91 // See comment #12 at http://crbug.com/23364 for specifics.
  92 static const int kTransportConnectJobTimeoutInSeconds = 240;  // 4 minutes.
  93
  94 TransportConnectJobHelper::TransportConnectJobHelper(
  95     const scoped_refptr<TransportSocketParams>& params,
  96     ClientSocketFactory* client_socket_factory,
  97     HostResolver* host_resolver,
  98     LoadTimingInfo::ConnectTiming* connect_timing)
  99     : params_(params),
 100       client_socket_factory_(client_socket_factory),
 101       resolver_(host_resolver),
 102       next_state_(STATE_NONE),
 103       connect_timing_(connect_timing) {}
 104
 105 TransportConnectJobHelper::~TransportConnectJobHelper() {}
 106
 107 int TransportConnectJobHelper::DoResolveHost(RequestPriority priority,
 108                                              const BoundNetLog& net_log) {
 109   next_state_ = STATE_RESOLVE_HOST_COMPLETE;
 110   connect_timing_->dns_start = base::TimeTicks::Now();
 111
 112   return resolver_.Resolve(
 113       params_->destination(), priority, &addresses_, on_io_complete_, net_log);
 114 }
 115
 116 int TransportConnectJobHelper::DoResolveHostComplete(
 117     int result,
 118     const BoundNetLog& net_log) {
 119   connect_timing_->dns_end = base::TimeTicks::Now();
 120   // Overwrite connection start time, since for connections that do not go
 121   // through proxies, |connect_start| should not include dns lookup time.
 122   connect_timing_->connect_start = connect_timing_->dns_end;
 123
 124   if (result == OK) {
 125     // Invoke callback, and abort if it fails.
 126     if (!params_->host_resolution_callback().is_null())
 127       result = params_->host_resolution_callback().Run(addresses_, net_log);
 128
 129     if (result == OK)
 130       next_state_ = STATE_TRANSPORT_CONNECT;
 131   }
 132   return result;
 133 }
 134
 135 base::TimeDelta TransportConnectJobHelper::HistogramDuration(
 136     ConnectionLatencyHistogram race_result) {
 137   DCHECK(!connect_timing_->connect_start.is_null());
 138   DCHECK(!connect_timing_->dns_start.is_null());
 139   base::TimeTicks now = base::TimeTicks::Now();
 140   base::TimeDelta total_duration = now - connect_timing_->dns_start;
 141   UMA_HISTOGRAM_CUSTOM_TIMES("Net.DNS_Resolution_And_TCP_Connection_Latency2",
 142                              total_duration,
 143                              base::TimeDelta::FromMilliseconds(1),
 144                              base::TimeDelta::FromMinutes(10),
 145                              100);
 146
 147   base::TimeDelta connect_duration = now - connect_timing_->connect_start;
 148   UMA_HISTOGRAM_CUSTOM_TIMES("Net.TCP_Connection_Latency",
 149                              connect_duration,
 150                              base::TimeDelta::FromMilliseconds(1),
 151                              base::TimeDelta::FromMinutes(10),
 152                              100);
 153
 154   switch (race_result) {
 155     case CONNECTION_LATENCY_IPV4_WINS_RACE:
 156       UMA_HISTOGRAM_CUSTOM_TIMES("Net.TCP_Connection_Latency_IPv4_Wins_Race",
 157                                  connect_duration,
 158                                  base::TimeDelta::FromMilliseconds(1),
 159                                  base::TimeDelta::FromMinutes(10),
 160                                  100);
 161       break;
 162
 163     case CONNECTION_LATENCY_IPV4_NO_RACE:
 164       UMA_HISTOGRAM_CUSTOM_TIMES("Net.TCP_Connection_Latency_IPv4_No_Race",
 165                                  connect_duration,
 166                                  base::TimeDelta::FromMilliseconds(1),
 167                                  base::TimeDelta::FromMinutes(10),
 168                                  100);
 169       break;
 170
 171     case CONNECTION_LATENCY_IPV6_RACEABLE:
 172       UMA_HISTOGRAM_CUSTOM_TIMES("Net.TCP_Connection_Latency_IPv6_Raceable",
 173                                  connect_duration,
 174                                  base::TimeDelta::FromMilliseconds(1),
 175                                  base::TimeDelta::FromMinutes(10),
 176                                  100);
 177       break;
 178
 179     case CONNECTION_LATENCY_IPV6_SOLO:
 180       UMA_HISTOGRAM_CUSTOM_TIMES("Net.TCP_Connection_Latency_IPv6_Solo",
 181                                  connect_duration,
 182                                  base::TimeDelta::FromMilliseconds(1),
 183                                  base::TimeDelta::FromMinutes(10),
 184                                  100);
 185       break;
 186
 187     default:
 188       NOTREACHED();
 189       break;
 190   }
 191
 192   return connect_duration;
 193 }
 194
 195 TransportConnectJob::TransportConnectJob(
 196     const std::string& group_name,
 197     RequestPriority priority,
 198     const scoped_refptr<TransportSocketParams>& params,
 199     base::TimeDelta timeout_duration,
 200     ClientSocketFactory* client_socket_factory,
 201     HostResolver* host_resolver,
 202     Delegate* delegate,
 203     NetLog* net_log)
 204     : ConnectJob(group_name,
 205                  timeout_duration,
 206                  priority,
 207                  delegate,
 208                  BoundNetLog::Make(net_log, NetLog::SOURCE_CONNECT_JOB)),
 209       helper_(params, client_socket_factory, host_resolver, &connect_timing_),
 210       interval_between_connects_(CONNECT_INTERVAL_GT_20MS),
 211       resolve_result_(OK) {
 212   helper_.SetOnIOComplete(this);
 213 }
 214
 215 TransportConnectJob::~TransportConnectJob() {
 216   // We don't worry about cancelling the host resolution and TCP connect, since
 217   // ~SingleRequestHostResolver and ~StreamSocket will take care of it.
 218 }
 219
 220 LoadState TransportConnectJob::GetLoadState() const {
 221   switch (helper_.next_state()) {
 222     case TransportConnectJobHelper::STATE_RESOLVE_HOST:
 223     case TransportConnectJobHelper::STATE_RESOLVE_HOST_COMPLETE:
 224       return LOAD_STATE_RESOLVING_HOST;
 225     case TransportConnectJobHelper::STATE_TRANSPORT_CONNECT:
 226     case TransportConnectJobHelper::STATE_TRANSPORT_CONNECT_COMPLETE:
 227       return LOAD_STATE_CONNECTING;
 228     case TransportConnectJobHelper::STATE_NONE:
 229       return LOAD_STATE_IDLE;
 230   }
 231   NOTREACHED();
 232   return LOAD_STATE_IDLE;
 233 }
 234
 235 void TransportConnectJob::GetAdditionalErrorState(ClientSocketHandle* handle) {
 236   // If hostname resolution failed, record an empty endpoint and the result.
 237   // Also record any attempts made on either of the sockets.
 238   ConnectionAttempts attempts;
 239   if (resolve_result_ != OK) {
 240     DCHECK_EQ(0u, helper_.addresses().size());
 241     attempts.push_back(ConnectionAttempt(IPEndPoint(), resolve_result_));
 242   }
 243   attempts.insert(attempts.begin(), connection_attempts_.begin(),
 244                   connection_attempts_.end());
 245   attempts.insert(attempts.begin(), fallback_connection_attempts_.begin(),
 246                   fallback_connection_attempts_.end());
 247   handle->set_connection_attempts(attempts);
 248 }
 249
 250 // static
 251 void TransportConnectJob::MakeAddressListStartWithIPv4(AddressList* list) {
 252   for (AddressList::iterator i = list->begin(); i != list->end(); ++i) {
 253     if (i->GetFamily() == ADDRESS_FAMILY_IPV4) {
 254       std::rotate(list->begin(), i, list->end());
 255       break;
 256     }
 257   }
 258 }
 259
 260 int TransportConnectJob::DoResolveHost() {
 261   // TODO(ricea): Remove ScopedTracker below once crbug.com/436634 is fixed.
 262   tracked_objects::ScopedTracker tracking_profile(
 263       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 264           "436634 TransportConnectJob::DoResolveHost"));
 265
 266   return helper_.DoResolveHost(priority(), net_log());
 267 }
 268
 269 int TransportConnectJob::DoResolveHostComplete(int result) {
 270   resolve_result_ = result;
 271   return helper_.DoResolveHostComplete(result, net_log());
 272 }
 273
 274 int TransportConnectJob::DoTransportConnect() {
 275   base::TimeTicks now = base::TimeTicks::Now();
 276   base::TimeTicks last_connect_time;
 277   {
 278     base::AutoLock lock(g_last_connect_time_lock.Get());
 279     last_connect_time = g_last_connect_time.Get();
 280     *g_last_connect_time.Pointer() = now;
 281   }
 282   if (last_connect_time.is_null()) {
 283     interval_between_connects_ = CONNECT_INTERVAL_GT_20MS;
 284   } else {
 285     int64 interval = (now - last_connect_time).InMilliseconds();
 286     if (interval <= 10)
 287       interval_between_connects_ = CONNECT_INTERVAL_LE_10MS;
 288     else if (interval <= 20)
 289       interval_between_connects_ = CONNECT_INTERVAL_LE_20MS;
 290     else
 291       interval_between_connects_ = CONNECT_INTERVAL_GT_20MS;
 292   }
 293
 294   helper_.set_next_state(
 295       TransportConnectJobHelper::STATE_TRANSPORT_CONNECT_COMPLETE);
 296   transport_socket_ =
 297       helper_.client_socket_factory()->CreateTransportClientSocket(
 298           helper_.addresses(), net_log().net_log(), net_log().source());
 299
 300   // If the list contains IPv6 and IPv4 addresses, the first address will
 301   // be IPv6, and the IPv4 addresses will be tried as fallback addresses,
 302   // per "Happy Eyeballs" (RFC 6555).
 303   bool try_ipv6_connect_with_ipv4_fallback =
 304       helper_.addresses().front().GetFamily() == ADDRESS_FAMILY_IPV6 &&
 305       !AddressListOnlyContainsIPv6(helper_.addresses());
 306
 307   // Enable TCP FastOpen if indicated by transport socket params.
 308   // Note: We currently do not turn on TCP FastOpen for destinations where
 309   // we try a TCP connect over IPv6 with fallback to IPv4.
 310   if (!try_ipv6_connect_with_ipv4_fallback &&
 311       helper_.params()->combine_connect_and_write() ==
 312           TransportSocketParams::COMBINE_CONNECT_AND_WRITE_DESIRED) {
 313     transport_socket_->EnableTCPFastOpenIfSupported();
 314   }
 315
 316   int rv = transport_socket_->Connect(helper_.on_io_complete());
 317   if (rv == ERR_IO_PENDING && try_ipv6_connect_with_ipv4_fallback) {
 318     fallback_timer_.Start(
 319         FROM_HERE,
 320         base::TimeDelta::FromMilliseconds(
 321             TransportConnectJobHelper::kIPv6FallbackTimerInMs),
 322         this,
 323         &TransportConnectJob::DoIPv6FallbackTransportConnect);
 324   }
 325   return rv;
 326 }
 327
 328 int TransportConnectJob::DoTransportConnectComplete(int result) {
 329   if (result == OK) {
 330     // Success will be returned via the main socket, so also include connection
 331     // attempts made on the fallback socket up to this point. (Unfortunately,
 332     // the only simple way to return information in the success case is through
 333     // the successfully-connected socket.)
 334     if (fallback_transport_socket_) {
 335       ConnectionAttempts fallback_attempts;
 336       fallback_transport_socket_->GetConnectionAttempts(&fallback_attempts);
 337       transport_socket_->AddConnectionAttempts(fallback_attempts);
 338     }
 339
 340     bool is_ipv4 =
 341         helper_.addresses().front().GetFamily() == ADDRESS_FAMILY_IPV4;
 342     TransportConnectJobHelper::ConnectionLatencyHistogram race_result =
 343         TransportConnectJobHelper::CONNECTION_LATENCY_UNKNOWN;
 344     if (is_ipv4) {
 345       race_result = TransportConnectJobHelper::CONNECTION_LATENCY_IPV4_NO_RACE;
 346     } else {
 347       if (AddressListOnlyContainsIPv6(helper_.addresses())) {
 348         race_result = TransportConnectJobHelper::CONNECTION_LATENCY_IPV6_SOLO;
 349       } else {
 350         race_result =
 351             TransportConnectJobHelper::CONNECTION_LATENCY_IPV6_RACEABLE;
 352       }
 353     }
 354     base::TimeDelta connect_duration = helper_.HistogramDuration(race_result);
 355     switch (interval_between_connects_) {
 356       case CONNECT_INTERVAL_LE_10MS:
 357         UMA_HISTOGRAM_CUSTOM_TIMES(
 358             "Net.TCP_Connection_Latency_Interval_LessThanOrEqual_10ms",
 359             connect_duration,
 360             base::TimeDelta::FromMilliseconds(1),
 361             base::TimeDelta::FromMinutes(10),
 362             100);
 363         break;
 364       case CONNECT_INTERVAL_LE_20MS:
 365         UMA_HISTOGRAM_CUSTOM_TIMES(
 366             "Net.TCP_Connection_Latency_Interval_LessThanOrEqual_20ms",
 367             connect_duration,
 368             base::TimeDelta::FromMilliseconds(1),
 369             base::TimeDelta::FromMinutes(10),
 370             100);
 371         break;
 372       case CONNECT_INTERVAL_GT_20MS:
 373         UMA_HISTOGRAM_CUSTOM_TIMES(
 374             "Net.TCP_Connection_Latency_Interval_GreaterThan_20ms",
 375             connect_duration,
 376             base::TimeDelta::FromMilliseconds(1),
 377             base::TimeDelta::FromMinutes(10),
 378             100);
 379         break;
 380       default:
 381         NOTREACHED();
 382         break;
 383     }
 384
 385     SetSocket(transport_socket_.Pass());
 386   } else {
 387     // Failure will be returned via |GetAdditionalErrorState|, so save
 388     // connection attempts from both sockets for use there.
 389     CopyConnectionAttemptsFromSockets();
 390
 391     transport_socket_.reset();
 392   }
 393
 394   fallback_timer_.Stop();
 395   fallback_transport_socket_.reset();
 396   fallback_addresses_.reset();
 397
 398   return result;
 399 }
 400
 401 void TransportConnectJob::DoIPv6FallbackTransportConnect() {
 402   // The timer should only fire while we're waiting for the main connect to
 403   // succeed.
 404   if (helper_.next_state() !=
 405       TransportConnectJobHelper::STATE_TRANSPORT_CONNECT_COMPLETE) {
 406     NOTREACHED();
 407     return;
 408   }
 409
 410   DCHECK(!fallback_transport_socket_.get());
 411   DCHECK(!fallback_addresses_.get());
 412
 413   fallback_addresses_.reset(new AddressList(helper_.addresses()));
 414   MakeAddressListStartWithIPv4(fallback_addresses_.get());
 415   fallback_transport_socket_ =
 416       helper_.client_socket_factory()->CreateTransportClientSocket(
 417           *fallback_addresses_, net_log().net_log(), net_log().source());
 418   fallback_connect_start_time_ = base::TimeTicks::Now();
 419   int rv = fallback_transport_socket_->Connect(
 420       base::Bind(
 421           &TransportConnectJob::DoIPv6FallbackTransportConnectComplete,
 422           base::Unretained(this)));
 423   if (rv != ERR_IO_PENDING)
 424     DoIPv6FallbackTransportConnectComplete(rv);
 425 }
 426
 427 void TransportConnectJob::DoIPv6FallbackTransportConnectComplete(int result) {
 428   // This should only happen when we're waiting for the main connect to succeed.
 429   if (helper_.next_state() !=
 430       TransportConnectJobHelper::STATE_TRANSPORT_CONNECT_COMPLETE) {
 431     NOTREACHED();
 432     return;
 433   }
 434
 435   DCHECK_NE(ERR_IO_PENDING, result);
 436   DCHECK(fallback_transport_socket_.get());
 437   DCHECK(fallback_addresses_.get());
 438
 439   if (result == OK) {
 440     DCHECK(!fallback_connect_start_time_.is_null());
 441
 442     // Success will be returned via the fallback socket, so also include
 443     // connection attempts made on the main socket up to this point.
 444     // (Unfortunately, the only simple way to return information in the success
 445     // case is through the successfully-connected socket.)
 446     if (transport_socket_) {
 447       ConnectionAttempts attempts;
 448       transport_socket_->GetConnectionAttempts(&attempts);
 449       fallback_transport_socket_->AddConnectionAttempts(attempts);
 450     }
 451
 452     connect_timing_.connect_start = fallback_connect_start_time_;
 453     helper_.HistogramDuration(
 454         TransportConnectJobHelper::CONNECTION_LATENCY_IPV4_WINS_RACE);
 455     SetSocket(fallback_transport_socket_.Pass());
 456     helper_.set_next_state(TransportConnectJobHelper::STATE_NONE);
 457   } else {
 458     // Failure will be returned via |GetAdditionalErrorState|, so save
 459     // connection attempts from both sockets for use there.
 460     CopyConnectionAttemptsFromSockets();
 461
 462     fallback_transport_socket_.reset();
 463     fallback_addresses_.reset();
 464   }
 465
 466   transport_socket_.reset();
 467
 468   NotifyDelegateOfCompletion(result);  // Deletes |this|
 469 }
 470
 471 int TransportConnectJob::ConnectInternal() {
 472   return helper_.DoConnectInternal(this);
 473 }
 474
 475 void TransportConnectJob::CopyConnectionAttemptsFromSockets() {
 476   if (transport_socket_)
 477     transport_socket_->GetConnectionAttempts(&connection_attempts_);
 478   if (fallback_transport_socket_) {
 479     fallback_transport_socket_->GetConnectionAttempts(
 480         &fallback_connection_attempts_);
 481   }
 482 }
 483
 484 scoped_ptr<ConnectJob>
 485 TransportClientSocketPool::TransportConnectJobFactory::NewConnectJob(
 486     const std::string& group_name,
 487     const PoolBase::Request& request,
 488     ConnectJob::Delegate* delegate) const {
 489   return scoped_ptr<ConnectJob>(
 490       new TransportConnectJob(group_name,
 491                               request.priority(),
 492                               request.params(),
 493                               ConnectionTimeout(),
 494                               client_socket_factory_,
 495                               host_resolver_,
 496                               delegate,
 497                               net_log_));
 498 }
 499
 500 base::TimeDelta
 501     TransportClientSocketPool::TransportConnectJobFactory::ConnectionTimeout()
 502     const {
 503   return base::TimeDelta::FromSeconds(kTransportConnectJobTimeoutInSeconds);
 504 }
 505
 506 TransportClientSocketPool::TransportClientSocketPool(
 507     int max_sockets,
 508     int max_sockets_per_group,
 509     HostResolver* host_resolver,
 510     ClientSocketFactory* client_socket_factory,
 511     NetLog* net_log)
 512     : base_(NULL,
 513             max_sockets,
 514             max_sockets_per_group,
 515             ClientSocketPool::unused_idle_socket_timeout(),
 516             ClientSocketPool::used_idle_socket_timeout(),
 517             new TransportConnectJobFactory(client_socket_factory,
 518                                            host_resolver,
 519                                            net_log)) {
 520   base_.EnableConnectBackupJobs();
 521 }
 522
 523 TransportClientSocketPool::~TransportClientSocketPool() {}
 524
 525 int TransportClientSocketPool::RequestSocket(
 526     const std::string& group_name,
 527     const void* params,
 528     RequestPriority priority,
 529     ClientSocketHandle* handle,
 530     const CompletionCallback& callback,
 531     const BoundNetLog& net_log) {
 532   const scoped_refptr<TransportSocketParams>* casted_params =
 533       static_cast<const scoped_refptr<TransportSocketParams>*>(params);
 534
 535   NetLogTcpClientSocketPoolRequestedSocket(net_log, casted_params);
 536
 537   return base_.RequestSocket(group_name, *casted_params, priority, handle,
 538                              callback, net_log);
 539 }
 540
 541 void TransportClientSocketPool::NetLogTcpClientSocketPoolRequestedSocket(
 542     const BoundNetLog& net_log,
 543     const scoped_refptr<TransportSocketParams>* casted_params) {
 544   if (net_log.IsCapturing()) {
 545     // TODO(eroman): Split out the host and port parameters.
 546     net_log.AddEvent(
 547         NetLog::TYPE_TCP_CLIENT_SOCKET_POOL_REQUESTED_SOCKET,
 548         CreateNetLogHostPortPairCallback(
 549             &casted_params->get()->destination().host_port_pair()));
 550   }
 551 }
 552
 553 void TransportClientSocketPool::RequestSockets(
 554     const std::string& group_name,
 555     const void* params,
 556     int num_sockets,
 557     const BoundNetLog& net_log) {
 558   const scoped_refptr<TransportSocketParams>* casted_params =
 559       static_cast<const scoped_refptr<TransportSocketParams>*>(params);
 560
 561   if (net_log.IsCapturing()) {
 562     // TODO(eroman): Split out the host and port parameters.
 563     net_log.AddEvent(
 564         NetLog::TYPE_TCP_CLIENT_SOCKET_POOL_REQUESTED_SOCKETS,
 565         CreateNetLogHostPortPairCallback(
 566             &casted_params->get()->destination().host_port_pair()));
 567   }
 568
 569   base_.RequestSockets(group_name, *casted_params, num_sockets, net_log);
 570 }
 571
 572 void TransportClientSocketPool::CancelRequest(
 573     const std::string& group_name,
 574     ClientSocketHandle* handle) {
 575   base_.CancelRequest(group_name, handle);
 576 }
 577
 578 void TransportClientSocketPool::ReleaseSocket(
 579     const std::string& group_name,
 580     scoped_ptr<StreamSocket> socket,
 581     int id) {
 582   base_.ReleaseSocket(group_name, socket.Pass(), id);
 583 }
 584
 585 void TransportClientSocketPool::FlushWithError(int error) {
 586   base_.FlushWithError(error);
 587 }
 588
 589 void TransportClientSocketPool::CloseIdleSockets() {
 590   base_.CloseIdleSockets();
 591 }
 592
 593 int TransportClientSocketPool::IdleSocketCount() const {
 594   return base_.idle_socket_count();
 595 }
 596
 597 int TransportClientSocketPool::IdleSocketCountInGroup(
 598     const std::string& group_name) const {
 599   return base_.IdleSocketCountInGroup(group_name);
 600 }
 601
 602 LoadState TransportClientSocketPool::GetLoadState(
 603     const std::string& group_name, const ClientSocketHandle* handle) const {
 604   return base_.GetLoadState(group_name, handle);
 605 }
 606
 607 scoped_ptr<base::DictionaryValue> TransportClientSocketPool::GetInfoAsValue(
 608     const std::string& name,
 609     const std::string& type,
 610     bool include_nested_pools) const {
 611   return base_.GetInfoAsValue(name, type);
 612 }
 613
 614 base::TimeDelta TransportClientSocketPool::ConnectionTimeout() const {
 615   return base_.ConnectionTimeout();
 616 }
 617
 618 bool TransportClientSocketPool::IsStalled() const {
 619   return base_.IsStalled();
 620 }
 621
 622 void TransportClientSocketPool::AddHigherLayeredPool(
 623     HigherLayeredPool* higher_pool) {
 624   base_.AddHigherLayeredPool(higher_pool);
 625 }
 626
 627 void TransportClientSocketPool::RemoveHigherLayeredPool(
 628     HigherLayeredPool* higher_pool) {
 629   base_.RemoveHigherLayeredPool(higher_pool);
 630 }
 631
 632 }  // namespace net