net/socket/websocket_transport_client_socket_pool.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/socket/websocket_transport_client_socket_pool.h"
   6
   7 #include <algorithm>
   8
   9 #include "base/compiler_specific.h"
  10 #include "base/logging.h"
  11 #include "base/numerics/safe_conversions.h"
  12 #include "base/profiler/scoped_tracker.h"
  13 #include "base/strings/string_util.h"
  14 #include "base/time/time.h"
  15 #include "base/values.h"
  16 #include "net/base/net_errors.h"
  17 #include "net/log/net_log.h"
  18 #include "net/socket/client_socket_handle.h"
  19 #include "net/socket/client_socket_pool_base.h"
  20 #include "net/socket/websocket_endpoint_lock_manager.h"
  21 #include "net/socket/websocket_transport_connect_sub_job.h"
  22
  23 namespace net {
  24
  25 namespace {
  26
  27 using base::TimeDelta;
  28
  29 // TODO(ricea): For now, we implement a global timeout for compatability with
  30 // TransportConnectJob. Since WebSocketTransportConnectJob controls the address
  31 // selection process more tightly, it could do something smarter here.
  32 const int kTransportConnectJobTimeoutInSeconds = 240;  // 4 minutes.
  33
  34 }  // namespace
  35
  36 WebSocketTransportConnectJob::WebSocketTransportConnectJob(
  37     const std::string& group_name,
  38     RequestPriority priority,
  39     const scoped_refptr<TransportSocketParams>& params,
  40     TimeDelta timeout_duration,
  41     const CompletionCallback& callback,
  42     ClientSocketFactory* client_socket_factory,
  43     HostResolver* host_resolver,
  44     ClientSocketHandle* handle,
  45     Delegate* delegate,
  46     NetLog* pool_net_log,
  47     const BoundNetLog& request_net_log)
  48     : ConnectJob(group_name,
  49                  timeout_duration,
  50                  priority,
  51                  delegate,
  52                  BoundNetLog::Make(pool_net_log, NetLog::SOURCE_CONNECT_JOB)),
  53       helper_(params, client_socket_factory, host_resolver, &connect_timing_),
  54       race_result_(TransportConnectJobHelper::CONNECTION_LATENCY_UNKNOWN),
  55       handle_(handle),
  56       callback_(callback),
  57       request_net_log_(request_net_log),
  58       had_ipv4_(false),
  59       had_ipv6_(false) {
  60   helper_.SetOnIOComplete(this);
  61 }
  62
  63 WebSocketTransportConnectJob::~WebSocketTransportConnectJob() {}
  64
  65 LoadState WebSocketTransportConnectJob::GetLoadState() const {
  66   LoadState load_state = LOAD_STATE_RESOLVING_HOST;
  67   if (ipv6_job_)
  68     load_state = ipv6_job_->GetLoadState();
  69   // This method should return LOAD_STATE_CONNECTING in preference to
  70   // LOAD_STATE_WAITING_FOR_AVAILABLE_SOCKET when possible because "waiting for
  71   // available socket" implies that nothing is happening.
  72   if (ipv4_job_ && load_state != LOAD_STATE_CONNECTING)
  73     load_state = ipv4_job_->GetLoadState();
  74   return load_state;
  75 }
  76
  77 int WebSocketTransportConnectJob::DoResolveHost() {
  78   return helper_.DoResolveHost(priority(), net_log());
  79 }
  80
  81 int WebSocketTransportConnectJob::DoResolveHostComplete(int result) {
  82   return helper_.DoResolveHostComplete(result, net_log());
  83 }
  84
  85 int WebSocketTransportConnectJob::DoTransportConnect() {
  86   AddressList ipv4_addresses;
  87   AddressList ipv6_addresses;
  88   int result = ERR_UNEXPECTED;
  89   helper_.set_next_state(
  90       TransportConnectJobHelper::STATE_TRANSPORT_CONNECT_COMPLETE);
  91
  92   for (AddressList::const_iterator it = helper_.addresses().begin();
  93        it != helper_.addresses().end();
  94        ++it) {
  95     switch (it->GetFamily()) {
  96       case ADDRESS_FAMILY_IPV4:
  97         ipv4_addresses.push_back(*it);
  98         break;
  99
 100       case ADDRESS_FAMILY_IPV6:
 101         ipv6_addresses.push_back(*it);
 102         break;
 103
 104       default:
 105         DVLOG(1) << "Unexpected ADDRESS_FAMILY: " << it->GetFamily();
 106         break;
 107     }
 108   }
 109
 110   if (!ipv4_addresses.empty()) {
 111     had_ipv4_ = true;
 112     ipv4_job_.reset(new WebSocketTransportConnectSubJob(
 113         ipv4_addresses, this, SUB_JOB_IPV4));
 114   }
 115
 116   if (!ipv6_addresses.empty()) {
 117     had_ipv6_ = true;
 118     ipv6_job_.reset(new WebSocketTransportConnectSubJob(
 119         ipv6_addresses, this, SUB_JOB_IPV6));
 120     result = ipv6_job_->Start();
 121     switch (result) {
 122       case OK:
 123         SetSocket(ipv6_job_->PassSocket());
 124         race_result_ =
 125             had_ipv4_
 126                 ? TransportConnectJobHelper::CONNECTION_LATENCY_IPV6_RACEABLE
 127                 : TransportConnectJobHelper::CONNECTION_LATENCY_IPV6_SOLO;
 128         return result;
 129
 130       case ERR_IO_PENDING:
 131         if (ipv4_job_) {
 132           // This use of base::Unretained is safe because |fallback_timer_| is
 133           // owned by this object.
 134           fallback_timer_.Start(
 135               FROM_HERE,
 136               TimeDelta::FromMilliseconds(
 137                   TransportConnectJobHelper::kIPv6FallbackTimerInMs),
 138               base::Bind(&WebSocketTransportConnectJob::StartIPv4JobAsync,
 139                          base::Unretained(this)));
 140         }
 141         return result;
 142
 143       default:
 144         ipv6_job_.reset();
 145     }
 146   }
 147
 148   DCHECK(!ipv6_job_);
 149   if (ipv4_job_) {
 150     result = ipv4_job_->Start();
 151     if (result == OK) {
 152       SetSocket(ipv4_job_->PassSocket());
 153       race_result_ =
 154           had_ipv6_
 155               ? TransportConnectJobHelper::CONNECTION_LATENCY_IPV4_WINS_RACE
 156               : TransportConnectJobHelper::CONNECTION_LATENCY_IPV4_NO_RACE;
 157     }
 158   }
 159
 160   return result;
 161 }
 162
 163 int WebSocketTransportConnectJob::DoTransportConnectComplete(int result) {
 164   if (result == OK)
 165     helper_.HistogramDuration(race_result_);
 166   return result;
 167 }
 168
 169 void WebSocketTransportConnectJob::OnSubJobComplete(
 170     int result,
 171     WebSocketTransportConnectSubJob* job) {
 172   if (result == OK) {
 173     switch (job->type()) {
 174       case SUB_JOB_IPV4:
 175         race_result_ =
 176             had_ipv6_
 177                 ? TransportConnectJobHelper::CONNECTION_LATENCY_IPV4_WINS_RACE
 178                 : TransportConnectJobHelper::CONNECTION_LATENCY_IPV4_NO_RACE;
 179         break;
 180
 181       case SUB_JOB_IPV6:
 182         race_result_ =
 183             had_ipv4_
 184                 ? TransportConnectJobHelper::CONNECTION_LATENCY_IPV6_RACEABLE
 185                 : TransportConnectJobHelper::CONNECTION_LATENCY_IPV6_SOLO;
 186         break;
 187     }
 188     SetSocket(job->PassSocket());
 189
 190     // Make sure all connections are cancelled even if this object fails to be
 191     // deleted.
 192     ipv4_job_.reset();
 193     ipv6_job_.reset();
 194   } else {
 195     switch (job->type()) {
 196       case SUB_JOB_IPV4:
 197         ipv4_job_.reset();
 198         break;
 199
 200       case SUB_JOB_IPV6:
 201         ipv6_job_.reset();
 202         if (ipv4_job_ && !ipv4_job_->started()) {
 203           fallback_timer_.Stop();
 204           result = ipv4_job_->Start();
 205           if (result != ERR_IO_PENDING) {
 206             OnSubJobComplete(result, ipv4_job_.get());
 207             return;
 208           }
 209         }
 210         break;
 211     }
 212     if (ipv4_job_ || ipv6_job_)
 213       return;
 214   }
 215   helper_.OnIOComplete(this, result);
 216 }
 217
 218 void WebSocketTransportConnectJob::StartIPv4JobAsync() {
 219   DCHECK(ipv4_job_);
 220   int result = ipv4_job_->Start();
 221   if (result != ERR_IO_PENDING)
 222     OnSubJobComplete(result, ipv4_job_.get());
 223 }
 224
 225 int WebSocketTransportConnectJob::ConnectInternal() {
 226   return helper_.DoConnectInternal(this);
 227 }
 228
 229 WebSocketTransportClientSocketPool::WebSocketTransportClientSocketPool(
 230     int max_sockets,
 231     int max_sockets_per_group,
 232     HostResolver* host_resolver,
 233     ClientSocketFactory* client_socket_factory,
 234     NetLog* net_log)
 235     : TransportClientSocketPool(max_sockets,
 236                                 max_sockets_per_group,
 237                                 host_resolver,
 238                                 client_socket_factory,
 239                                 net_log),
 240       connect_job_delegate_(this),
 241       pool_net_log_(net_log),
 242       client_socket_factory_(client_socket_factory),
 243       host_resolver_(host_resolver),
 244       max_sockets_(max_sockets),
 245       handed_out_socket_count_(0),
 246       flushing_(false),
 247       weak_factory_(this) {}
 248
 249 WebSocketTransportClientSocketPool::~WebSocketTransportClientSocketPool() {
 250   // Clean up any pending connect jobs.
 251   FlushWithError(ERR_ABORTED);
 252   DCHECK(pending_connects_.empty());
 253   DCHECK_EQ(0, handed_out_socket_count_);
 254   DCHECK(stalled_request_queue_.empty());
 255   DCHECK(stalled_request_map_.empty());
 256 }
 257
 258 // static
 259 void WebSocketTransportClientSocketPool::UnlockEndpoint(
 260     ClientSocketHandle* handle) {
 261   DCHECK(handle->is_initialized());
 262   DCHECK(handle->socket());
 263   IPEndPoint address;
 264   if (handle->socket()->GetPeerAddress(&address) == OK)
 265     WebSocketEndpointLockManager::GetInstance()->UnlockEndpoint(address);
 266 }
 267
 268 int WebSocketTransportClientSocketPool::RequestSocket(
 269     const std::string& group_name,
 270     const void* params,
 271     RequestPriority priority,
 272     ClientSocketHandle* handle,
 273     const CompletionCallback& callback,
 274     const BoundNetLog& request_net_log) {
 275   DCHECK(params);
 276   const scoped_refptr<TransportSocketParams>& casted_params =
 277       *static_cast<const scoped_refptr<TransportSocketParams>*>(params);
 278
 279   NetLogTcpClientSocketPoolRequestedSocket(request_net_log, &casted_params);
 280
 281   CHECK(!callback.is_null());
 282   CHECK(handle);
 283
 284   request_net_log.BeginEvent(NetLog::TYPE_SOCKET_POOL);
 285
 286   if (ReachedMaxSocketsLimit() && !casted_params->ignore_limits()) {
 287     request_net_log.AddEvent(NetLog::TYPE_SOCKET_POOL_STALLED_MAX_SOCKETS);
 288     // TODO(ricea): Use emplace_back when C++11 becomes allowed.
 289     StalledRequest request(
 290         casted_params, priority, handle, callback, request_net_log);
 291     stalled_request_queue_.push_back(request);
 292     StalledRequestQueue::iterator iterator = stalled_request_queue_.end();
 293     --iterator;
 294     DCHECK_EQ(handle, iterator->handle);
 295     // Because StalledRequestQueue is a std::list, its iterators are guaranteed
 296     // to remain valid as long as the elements are not removed. As long as
 297     // stalled_request_queue_ and stalled_request_map_ are updated in sync, it
 298     // is safe to dereference an iterator in stalled_request_map_ to find the
 299     // corresponding list element.
 300     stalled_request_map_.insert(
 301         StalledRequestMap::value_type(handle, iterator));
 302     return ERR_IO_PENDING;
 303   }
 304
 305   scoped_ptr<WebSocketTransportConnectJob> connect_job(
 306       new WebSocketTransportConnectJob(group_name,
 307                                        priority,
 308                                        casted_params,
 309                                        ConnectionTimeout(),
 310                                        callback,
 311                                        client_socket_factory_,
 312                                        host_resolver_,
 313                                        handle,
 314                                        &connect_job_delegate_,
 315                                        pool_net_log_,
 316                                        request_net_log));
 317
 318   int rv = connect_job->Connect();
 319   // Regardless of the outcome of |connect_job|, it will always be bound to
 320   // |handle|, since this pool uses early-binding. So the binding is logged
 321   // here, without waiting for the result.
 322   request_net_log.AddEvent(
 323       NetLog::TYPE_SOCKET_POOL_BOUND_TO_CONNECT_JOB,
 324       connect_job->net_log().source().ToEventParametersCallback());
 325   if (rv == OK) {
 326     HandOutSocket(connect_job->PassSocket(),
 327                   connect_job->connect_timing(),
 328                   handle,
 329                   request_net_log);
 330     request_net_log.EndEvent(NetLog::TYPE_SOCKET_POOL);
 331   } else if (rv == ERR_IO_PENDING) {
 332     // TODO(ricea): Implement backup job timer?
 333     AddJob(handle, connect_job.Pass());
 334   } else {
 335     scoped_ptr<StreamSocket> error_socket;
 336     connect_job->GetAdditionalErrorState(handle);
 337     error_socket = connect_job->PassSocket();
 338     if (error_socket) {
 339       HandOutSocket(error_socket.Pass(),
 340                     connect_job->connect_timing(),
 341                     handle,
 342                     request_net_log);
 343     }
 344   }
 345
 346   if (rv != ERR_IO_PENDING) {
 347     request_net_log.EndEventWithNetErrorCode(NetLog::TYPE_SOCKET_POOL, rv);
 348   }
 349
 350   return rv;
 351 }
 352
 353 void WebSocketTransportClientSocketPool::RequestSockets(
 354     const std::string& group_name,
 355     const void* params,
 356     int num_sockets,
 357     const BoundNetLog& net_log) {
 358   NOTIMPLEMENTED();
 359 }
 360
 361 void WebSocketTransportClientSocketPool::CancelRequest(
 362     const std::string& group_name,
 363     ClientSocketHandle* handle) {
 364   DCHECK(!handle->is_initialized());
 365   if (DeleteStalledRequest(handle))
 366     return;
 367   scoped_ptr<StreamSocket> socket = handle->PassSocket();
 368   if (socket)
 369     ReleaseSocket(handle->group_name(), socket.Pass(), handle->id());
 370   if (!DeleteJob(handle))
 371     pending_callbacks_.erase(handle);
 372   if (!ReachedMaxSocketsLimit() && !stalled_request_queue_.empty())
 373     ActivateStalledRequest();
 374 }
 375
 376 void WebSocketTransportClientSocketPool::ReleaseSocket(
 377     const std::string& group_name,
 378     scoped_ptr<StreamSocket> socket,
 379     int id) {
 380   WebSocketEndpointLockManager::GetInstance()->UnlockSocket(socket.get());
 381   CHECK_GT(handed_out_socket_count_, 0);
 382   --handed_out_socket_count_;
 383   if (!ReachedMaxSocketsLimit() && !stalled_request_queue_.empty())
 384     ActivateStalledRequest();
 385 }
 386
 387 void WebSocketTransportClientSocketPool::FlushWithError(int error) {
 388   // Sockets which are in LOAD_STATE_CONNECTING are in danger of unlocking
 389   // sockets waiting for the endpoint lock. If they connected synchronously,
 390   // then OnConnectJobComplete(). The |flushing_| flag tells this object to
 391   // ignore spurious calls to OnConnectJobComplete(). It is safe to ignore those
 392   // calls because this method will delete the jobs and call their callbacks
 393   // anyway.
 394   flushing_ = true;
 395   for (PendingConnectsMap::iterator it = pending_connects_.begin();
 396        it != pending_connects_.end();
 397        ++it) {
 398     InvokeUserCallbackLater(
 399         it->second->handle(), it->second->callback(), error);
 400     delete it->second, it->second = NULL;
 401   }
 402   pending_connects_.clear();
 403   for (StalledRequestQueue::iterator it = stalled_request_queue_.begin();
 404        it != stalled_request_queue_.end();
 405        ++it) {
 406     InvokeUserCallbackLater(it->handle, it->callback, error);
 407   }
 408   stalled_request_map_.clear();
 409   stalled_request_queue_.clear();
 410   flushing_ = false;
 411 }
 412
 413 void WebSocketTransportClientSocketPool::CloseIdleSockets() {
 414   // We have no idle sockets.
 415 }
 416
 417 int WebSocketTransportClientSocketPool::IdleSocketCount() const {
 418   return 0;
 419 }
 420
 421 int WebSocketTransportClientSocketPool::IdleSocketCountInGroup(
 422     const std::string& group_name) const {
 423   return 0;
 424 }
 425
 426 LoadState WebSocketTransportClientSocketPool::GetLoadState(
 427     const std::string& group_name,
 428     const ClientSocketHandle* handle) const {
 429   if (stalled_request_map_.find(handle) != stalled_request_map_.end())
 430     return LOAD_STATE_WAITING_FOR_AVAILABLE_SOCKET;
 431   if (pending_callbacks_.count(handle))
 432     return LOAD_STATE_CONNECTING;
 433   return LookupConnectJob(handle)->GetLoadState();
 434 }
 435
 436 base::DictionaryValue* WebSocketTransportClientSocketPool::GetInfoAsValue(
 437     const std::string& name,
 438     const std::string& type,
 439     bool include_nested_pools) const {
 440   base::DictionaryValue* dict = new base::DictionaryValue();
 441   dict->SetString("name", name);
 442   dict->SetString("type", type);
 443   dict->SetInteger("handed_out_socket_count", handed_out_socket_count_);
 444   dict->SetInteger("connecting_socket_count", pending_connects_.size());
 445   dict->SetInteger("idle_socket_count", 0);
 446   dict->SetInteger("max_socket_count", max_sockets_);
 447   dict->SetInteger("max_sockets_per_group", max_sockets_);
 448   dict->SetInteger("pool_generation_number", 0);
 449   return dict;
 450 }
 451
 452 TimeDelta WebSocketTransportClientSocketPool::ConnectionTimeout() const {
 453   return TimeDelta::FromSeconds(kTransportConnectJobTimeoutInSeconds);
 454 }
 455
 456 bool WebSocketTransportClientSocketPool::IsStalled() const {
 457   return !stalled_request_queue_.empty();
 458 }
 459
 460 void WebSocketTransportClientSocketPool::OnConnectJobComplete(
 461     int result,
 462     WebSocketTransportConnectJob* job) {
 463   DCHECK_NE(ERR_IO_PENDING, result);
 464
 465   scoped_ptr<StreamSocket> socket = job->PassSocket();
 466
 467   // See comment in FlushWithError.
 468   if (flushing_) {
 469     WebSocketEndpointLockManager::GetInstance()->UnlockSocket(socket.get());
 470     return;
 471   }
 472
 473   BoundNetLog request_net_log = job->request_net_log();
 474   CompletionCallback callback = job->callback();
 475   LoadTimingInfo::ConnectTiming connect_timing = job->connect_timing();
 476
 477   ClientSocketHandle* const handle = job->handle();
 478   bool handed_out_socket = false;
 479
 480   if (result == OK) {
 481     DCHECK(socket.get());
 482     handed_out_socket = true;
 483     HandOutSocket(socket.Pass(), connect_timing, handle, request_net_log);
 484     request_net_log.EndEvent(NetLog::TYPE_SOCKET_POOL);
 485   } else {
 486     // If we got a socket, it must contain error information so pass that
 487     // up so that the caller can retrieve it.
 488     job->GetAdditionalErrorState(handle);
 489     if (socket.get()) {
 490       handed_out_socket = true;
 491       HandOutSocket(socket.Pass(), connect_timing, handle, request_net_log);
 492     }
 493     request_net_log.EndEventWithNetErrorCode(NetLog::TYPE_SOCKET_POOL, result);
 494   }
 495   bool delete_succeeded = DeleteJob(handle);
 496   DCHECK(delete_succeeded);
 497   if (!handed_out_socket && !stalled_request_queue_.empty() &&
 498       !ReachedMaxSocketsLimit())
 499     ActivateStalledRequest();
 500   InvokeUserCallbackLater(handle, callback, result);
 501 }
 502
 503 void WebSocketTransportClientSocketPool::InvokeUserCallbackLater(
 504     ClientSocketHandle* handle,
 505     const CompletionCallback& callback,
 506     int rv) {
 507   DCHECK(!pending_callbacks_.count(handle));
 508   pending_callbacks_.insert(handle);
 509   base::MessageLoop::current()->PostTask(
 510       FROM_HERE,
 511       base::Bind(&WebSocketTransportClientSocketPool::InvokeUserCallback,
 512                  weak_factory_.GetWeakPtr(),
 513                  handle,
 514                  callback,
 515                  rv));
 516 }
 517
 518 void WebSocketTransportClientSocketPool::InvokeUserCallback(
 519     ClientSocketHandle* handle,
 520     const CompletionCallback& callback,
 521     int rv) {
 522   if (pending_callbacks_.erase(handle))
 523     callback.Run(rv);
 524 }
 525
 526 bool WebSocketTransportClientSocketPool::ReachedMaxSocketsLimit() const {
 527   return handed_out_socket_count_ >= max_sockets_ ||
 528          base::checked_cast<int>(pending_connects_.size()) >=
 529              max_sockets_ - handed_out_socket_count_;
 530 }
 531
 532 void WebSocketTransportClientSocketPool::HandOutSocket(
 533     scoped_ptr<StreamSocket> socket,
 534     const LoadTimingInfo::ConnectTiming& connect_timing,
 535     ClientSocketHandle* handle,
 536     const BoundNetLog& net_log) {
 537   DCHECK(socket);
 538   handle->SetSocket(socket.Pass());
 539   DCHECK_EQ(ClientSocketHandle::UNUSED, handle->reuse_type());
 540   DCHECK_EQ(0, handle->idle_time().InMicroseconds());
 541   handle->set_pool_id(0);
 542   handle->set_connect_timing(connect_timing);
 543
 544   net_log.AddEvent(
 545       NetLog::TYPE_SOCKET_POOL_BOUND_TO_SOCKET,
 546       handle->socket()->NetLog().source().ToEventParametersCallback());
 547
 548   ++handed_out_socket_count_;
 549 }
 550
 551 void WebSocketTransportClientSocketPool::AddJob(
 552     ClientSocketHandle* handle,
 553     scoped_ptr<WebSocketTransportConnectJob> connect_job) {
 554   bool inserted =
 555       pending_connects_.insert(PendingConnectsMap::value_type(
 556                                    handle, connect_job.release())).second;
 557   DCHECK(inserted);
 558 }
 559
 560 bool WebSocketTransportClientSocketPool::DeleteJob(ClientSocketHandle* handle) {
 561   PendingConnectsMap::iterator it = pending_connects_.find(handle);
 562   if (it == pending_connects_.end())
 563     return false;
 564   // Deleting a ConnectJob which holds an endpoint lock can lead to a different
 565   // ConnectJob proceeding to connect. If the connect proceeds synchronously
 566   // (usually because of a failure) then it can trigger that job to be
 567   // deleted. |it| remains valid because std::map guarantees that erase() does
 568   // not invalid iterators to other entries.
 569   delete it->second, it->second = NULL;
 570   DCHECK(pending_connects_.find(handle) == it);
 571   pending_connects_.erase(it);
 572   return true;
 573 }
 574
 575 const WebSocketTransportConnectJob*
 576 WebSocketTransportClientSocketPool::LookupConnectJob(
 577     const ClientSocketHandle* handle) const {
 578   PendingConnectsMap::const_iterator it = pending_connects_.find(handle);
 579   CHECK(it != pending_connects_.end());
 580   return it->second;
 581 }
 582
 583 void WebSocketTransportClientSocketPool::ActivateStalledRequest() {
 584   DCHECK(!stalled_request_queue_.empty());
 585   DCHECK(!ReachedMaxSocketsLimit());
 586   // Usually we will only be able to activate one stalled request at a time,
 587   // however if all the connects fail synchronously for some reason, we may be
 588   // able to clear the whole queue at once.
 589   while (!stalled_request_queue_.empty() && !ReachedMaxSocketsLimit()) {
 590     StalledRequest request(stalled_request_queue_.front());
 591     stalled_request_queue_.pop_front();
 592     stalled_request_map_.erase(request.handle);
 593     int rv = RequestSocket("ignored",
 594                            &request.params,
 595                            request.priority,
 596                            request.handle,
 597                            request.callback,
 598                            request.net_log);
 599     // ActivateStalledRequest() never returns synchronously, so it is never
 600     // called re-entrantly.
 601     if (rv != ERR_IO_PENDING)
 602       InvokeUserCallbackLater(request.handle, request.callback, rv);
 603   }
 604 }
 605
 606 bool WebSocketTransportClientSocketPool::DeleteStalledRequest(
 607     ClientSocketHandle* handle) {
 608   StalledRequestMap::iterator it = stalled_request_map_.find(handle);
 609   if (it == stalled_request_map_.end())
 610     return false;
 611   stalled_request_queue_.erase(it->second);
 612   stalled_request_map_.erase(it);
 613   return true;
 614 }
 615
 616 WebSocketTransportClientSocketPool::ConnectJobDelegate::ConnectJobDelegate(
 617     WebSocketTransportClientSocketPool* owner)
 618     : owner_(owner) {}
 619
 620 WebSocketTransportClientSocketPool::ConnectJobDelegate::~ConnectJobDelegate() {}
 621
 622 void
 623 WebSocketTransportClientSocketPool::ConnectJobDelegate::OnConnectJobComplete(
 624     int result,
 625     ConnectJob* job) {
 626   // TODO(vadimt): Remove ScopedTracker below once crbug.com/436634 is fixed.
 627   tracked_objects::ScopedTracker tracking_profile(
 628       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 629           "436634 WebSocket...::ConnectJobDelegate::OnConnectJobComplete"));
 630
 631   owner_->OnConnectJobComplete(result,
 632                                static_cast<WebSocketTransportConnectJob*>(job));
 633 }
 634
 635 WebSocketTransportClientSocketPool::StalledRequest::StalledRequest(
 636     const scoped_refptr<TransportSocketParams>& params,
 637     RequestPriority priority,
 638     ClientSocketHandle* handle,
 639     const CompletionCallback& callback,
 640     const BoundNetLog& net_log)
 641     : params(params),
 642       priority(priority),
 643       handle(handle),
 644       callback(callback),
 645       net_log(net_log) {}
 646
 647 WebSocketTransportClientSocketPool::StalledRequest::~StalledRequest() {}
 648
 649 }  // namespace net