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/strings/string_util.h"
  13 #include "base/time/time.h"
  14 #include "base/values.h"
  15 #include "net/base/net_errors.h"
  16 #include "net/log/net_log.h"
  17 #include "net/socket/client_socket_handle.h"
  18 #include "net/socket/client_socket_pool_base.h"
  19 #include "net/socket/websocket_endpoint_lock_manager.h"
  20 #include "net/socket/websocket_transport_connect_sub_job.h"
  21
  22 namespace net {
  23
  24 namespace {
  25
  26 using base::TimeDelta;
  27
  28 // TODO(ricea): For now, we implement a global timeout for compatability with
  29 // TransportConnectJob. Since WebSocketTransportConnectJob controls the address
  30 // selection process more tightly, it could do something smarter here.
  31 const int kTransportConnectJobTimeoutInSeconds = 240;  // 4 minutes.
  32
  33 }  // namespace
  34
  35 WebSocketTransportConnectJob::WebSocketTransportConnectJob(
  36     const std::string& group_name,
  37     RequestPriority priority,
  38     const scoped_refptr<TransportSocketParams>& params,
  39     TimeDelta timeout_duration,
  40     const CompletionCallback& callback,
  41     ClientSocketFactory* client_socket_factory,
  42     HostResolver* host_resolver,
  43     ClientSocketHandle* handle,
  44     Delegate* delegate,
  45     NetLog* pool_net_log,
  46     const BoundNetLog& request_net_log)
  47     : ConnectJob(group_name,
  48                  timeout_duration,
  49                  priority,
  50                  delegate,
  51                  BoundNetLog::Make(pool_net_log, NetLog::SOURCE_CONNECT_JOB)),
  52       helper_(params, client_socket_factory, host_resolver, &connect_timing_),
  53       race_result_(TransportConnectJobHelper::CONNECTION_LATENCY_UNKNOWN),
  54       handle_(handle),
  55       callback_(callback),
  56       request_net_log_(request_net_log),
  57       had_ipv4_(false),
  58       had_ipv6_(false) {
  59   helper_.SetOnIOComplete(this);
  60 }
  61
  62 WebSocketTransportConnectJob::~WebSocketTransportConnectJob() {}
  63
  64 LoadState WebSocketTransportConnectJob::GetLoadState() const {
  65   LoadState load_state = LOAD_STATE_RESOLVING_HOST;
  66   if (ipv6_job_)
  67     load_state = ipv6_job_->GetLoadState();
  68   // This method should return LOAD_STATE_CONNECTING in preference to
  69   // LOAD_STATE_WAITING_FOR_AVAILABLE_SOCKET when possible because "waiting for
  70   // available socket" implies that nothing is happening.
  71   if (ipv4_job_ && load_state != LOAD_STATE_CONNECTING)
  72     load_state = ipv4_job_->GetLoadState();
  73   return load_state;
  74 }
  75
  76 int WebSocketTransportConnectJob::DoResolveHost() {
  77   return helper_.DoResolveHost(priority(), net_log());
  78 }
  79
  80 int WebSocketTransportConnectJob::DoResolveHostComplete(int result) {
  81   return helper_.DoResolveHostComplete(result, net_log());
  82 }
  83
  84 int WebSocketTransportConnectJob::DoTransportConnect() {
  85   AddressList ipv4_addresses;
  86   AddressList ipv6_addresses;
  87   int result = ERR_UNEXPECTED;
  88   helper_.set_next_state(
  89       TransportConnectJobHelper::STATE_TRANSPORT_CONNECT_COMPLETE);
  90
  91   for (AddressList::const_iterator it = helper_.addresses().begin();
  92        it != helper_.addresses().end();
  93        ++it) {
  94     switch (it->GetFamily()) {
  95       case ADDRESS_FAMILY_IPV4:
  96         ipv4_addresses.push_back(*it);
  97         break;
  98
  99       case ADDRESS_FAMILY_IPV6:
 100         ipv6_addresses.push_back(*it);
 101         break;
 102
 103       default:
 104         DVLOG(1) << "Unexpected ADDRESS_FAMILY: " << it->GetFamily();
 105         break;
 106     }
 107   }
 108
 109   if (!ipv4_addresses.empty()) {
 110     had_ipv4_ = true;
 111     ipv4_job_.reset(new WebSocketTransportConnectSubJob(
 112         ipv4_addresses, this, SUB_JOB_IPV4));
 113   }
 114
 115   if (!ipv6_addresses.empty()) {
 116     had_ipv6_ = true;
 117     ipv6_job_.reset(new WebSocketTransportConnectSubJob(
 118         ipv6_addresses, this, SUB_JOB_IPV6));
 119     result = ipv6_job_->Start();
 120     switch (result) {
 121       case OK:
 122         SetSocket(ipv6_job_->PassSocket());
 123         race_result_ =
 124             had_ipv4_
 125                 ? TransportConnectJobHelper::CONNECTION_LATENCY_IPV6_RACEABLE
 126                 : TransportConnectJobHelper::CONNECTION_LATENCY_IPV6_SOLO;
 127         return result;
 128
 129       case ERR_IO_PENDING:
 130         if (ipv4_job_) {
 131           // This use of base::Unretained is safe because |fallback_timer_| is
 132           // owned by this object.
 133           fallback_timer_.Start(
 134               FROM_HERE,
 135               TimeDelta::FromMilliseconds(
 136                   TransportConnectJobHelper::kIPv6FallbackTimerInMs),
 137               base::Bind(&WebSocketTransportConnectJob::StartIPv4JobAsync,
 138                          base::Unretained(this)));
 139         }
 140         return result;
 141
 142       default:
 143         ipv6_job_.reset();
 144     }
 145   }
 146
 147   DCHECK(!ipv6_job_);
 148   if (ipv4_job_) {
 149     result = ipv4_job_->Start();
 150     if (result == OK) {
 151       SetSocket(ipv4_job_->PassSocket());
 152       race_result_ =
 153           had_ipv6_
 154               ? TransportConnectJobHelper::CONNECTION_LATENCY_IPV4_WINS_RACE
 155               : TransportConnectJobHelper::CONNECTION_LATENCY_IPV4_NO_RACE;
 156     }
 157   }
 158
 159   return result;
 160 }
 161
 162 int WebSocketTransportConnectJob::DoTransportConnectComplete(int result) {
 163   if (result == OK)
 164     helper_.HistogramDuration(race_result_);
 165   return result;
 166 }
 167
 168 void WebSocketTransportConnectJob::OnSubJobComplete(
 169     int result,
 170     WebSocketTransportConnectSubJob* job) {
 171   if (result == OK) {
 172     switch (job->type()) {
 173       case SUB_JOB_IPV4:
 174         race_result_ =
 175             had_ipv6_
 176                 ? TransportConnectJobHelper::CONNECTION_LATENCY_IPV4_WINS_RACE
 177                 : TransportConnectJobHelper::CONNECTION_LATENCY_IPV4_NO_RACE;
 178         break;
 179
 180       case SUB_JOB_IPV6:
 181         race_result_ =
 182             had_ipv4_
 183                 ? TransportConnectJobHelper::CONNECTION_LATENCY_IPV6_RACEABLE
 184                 : TransportConnectJobHelper::CONNECTION_LATENCY_IPV6_SOLO;
 185         break;
 186     }
 187     SetSocket(job->PassSocket());
 188
 189     // Make sure all connections are cancelled even if this object fails to be
 190     // deleted.
 191     ipv4_job_.reset();
 192     ipv6_job_.reset();
 193   } else {
 194     switch (job->type()) {
 195       case SUB_JOB_IPV4:
 196         ipv4_job_.reset();
 197         break;
 198
 199       case SUB_JOB_IPV6:
 200         ipv6_job_.reset();
 201         if (ipv4_job_ && !ipv4_job_->started()) {
 202           fallback_timer_.Stop();
 203           result = ipv4_job_->Start();
 204           if (result != ERR_IO_PENDING) {
 205             OnSubJobComplete(result, ipv4_job_.get());
 206             return;
 207           }
 208         }
 209         break;
 210     }
 211     if (ipv4_job_ || ipv6_job_)
 212       return;
 213   }
 214   helper_.OnIOComplete(this, result);
 215 }
 216
 217 void WebSocketTransportConnectJob::StartIPv4JobAsync() {
 218   DCHECK(ipv4_job_);
 219   int result = ipv4_job_->Start();
 220   if (result != ERR_IO_PENDING)
 221     OnSubJobComplete(result, ipv4_job_.get());
 222 }
 223
 224 int WebSocketTransportConnectJob::ConnectInternal() {
 225   return helper_.DoConnectInternal(this);
 226 }
 227
 228 WebSocketTransportClientSocketPool::WebSocketTransportClientSocketPool(
 229     int max_sockets,
 230     int max_sockets_per_group,
 231     HostResolver* host_resolver,
 232     ClientSocketFactory* client_socket_factory,
 233     NetLog* net_log)
 234     : TransportClientSocketPool(max_sockets,
 235                                 max_sockets_per_group,
 236                                 host_resolver,
 237                                 client_socket_factory,
 238                                 net_log),
 239       connect_job_delegate_(this),
 240       pool_net_log_(net_log),
 241       client_socket_factory_(client_socket_factory),
 242       host_resolver_(host_resolver),
 243       max_sockets_(max_sockets),
 244       handed_out_socket_count_(0),
 245       flushing_(false),
 246       weak_factory_(this) {}
 247
 248 WebSocketTransportClientSocketPool::~WebSocketTransportClientSocketPool() {
 249   // Clean up any pending connect jobs.
 250   FlushWithError(ERR_ABORTED);
 251   DCHECK(pending_connects_.empty());
 252   DCHECK_EQ(0, handed_out_socket_count_);
 253   DCHECK(stalled_request_queue_.empty());
 254   DCHECK(stalled_request_map_.empty());
 255 }
 256
 257 // static
 258 void WebSocketTransportClientSocketPool::UnlockEndpoint(
 259     ClientSocketHandle* handle) {
 260   DCHECK(handle->is_initialized());
 261   DCHECK(handle->socket());
 262   IPEndPoint address;
 263   if (handle->socket()->GetPeerAddress(&address) == OK)
 264     WebSocketEndpointLockManager::GetInstance()->UnlockEndpoint(address);
 265 }
 266
 267 int WebSocketTransportClientSocketPool::RequestSocket(
 268     const std::string& group_name,
 269     const void* params,
 270     RequestPriority priority,
 271     ClientSocketHandle* handle,
 272     const CompletionCallback& callback,
 273     const BoundNetLog& request_net_log) {
 274   DCHECK(params);
 275   const scoped_refptr<TransportSocketParams>& casted_params =
 276       *static_cast<const scoped_refptr<TransportSocketParams>*>(params);
 277
 278   NetLogTcpClientSocketPoolRequestedSocket(request_net_log, &casted_params);
 279
 280   CHECK(!callback.is_null());
 281   CHECK(handle);
 282
 283   request_net_log.BeginEvent(NetLog::TYPE_SOCKET_POOL);
 284
 285   if (ReachedMaxSocketsLimit() && !casted_params->ignore_limits()) {
 286     request_net_log.AddEvent(NetLog::TYPE_SOCKET_POOL_STALLED_MAX_SOCKETS);
 287     // TODO(ricea): Use emplace_back when C++11 becomes allowed.
 288     StalledRequest request(
 289         casted_params, priority, handle, callback, request_net_log);
 290     stalled_request_queue_.push_back(request);
 291     StalledRequestQueue::iterator iterator = stalled_request_queue_.end();
 292     --iterator;
 293     DCHECK_EQ(handle, iterator->handle);
 294     // Because StalledRequestQueue is a std::list, its iterators are guaranteed
 295     // to remain valid as long as the elements are not removed. As long as
 296     // stalled_request_queue_ and stalled_request_map_ are updated in sync, it
 297     // is safe to dereference an iterator in stalled_request_map_ to find the
 298     // corresponding list element.
 299     stalled_request_map_.insert(
 300         StalledRequestMap::value_type(handle, iterator));
 301     return ERR_IO_PENDING;
 302   }
 303
 304   scoped_ptr<WebSocketTransportConnectJob> connect_job(
 305       new WebSocketTransportConnectJob(group_name,
 306                                        priority,
 307                                        casted_params,
 308                                        ConnectionTimeout(),
 309                                        callback,
 310                                        client_socket_factory_,
 311                                        host_resolver_,
 312                                        handle,
 313                                        &connect_job_delegate_,
 314                                        pool_net_log_,
 315                                        request_net_log));
 316
 317   int rv = connect_job->Connect();
 318   // Regardless of the outcome of |connect_job|, it will always be bound to
 319   // |handle|, since this pool uses early-binding. So the binding is logged
 320   // here, without waiting for the result.
 321   request_net_log.AddEvent(
 322       NetLog::TYPE_SOCKET_POOL_BOUND_TO_CONNECT_JOB,
 323       connect_job->net_log().source().ToEventParametersCallback());
 324   if (rv == OK) {
 325     HandOutSocket(connect_job->PassSocket(),
 326                   connect_job->connect_timing(),
 327                   handle,
 328                   request_net_log);
 329     request_net_log.EndEvent(NetLog::TYPE_SOCKET_POOL);
 330   } else if (rv == ERR_IO_PENDING) {
 331     // TODO(ricea): Implement backup job timer?
 332     AddJob(handle, connect_job.Pass());
 333   } else {
 334     scoped_ptr<StreamSocket> error_socket;
 335     connect_job->GetAdditionalErrorState(handle);
 336     error_socket = connect_job->PassSocket();
 337     if (error_socket) {
 338       HandOutSocket(error_socket.Pass(),
 339                     connect_job->connect_timing(),
 340                     handle,
 341                     request_net_log);
 342     }
 343   }
 344
 345   if (rv != ERR_IO_PENDING) {
 346     request_net_log.EndEventWithNetErrorCode(NetLog::TYPE_SOCKET_POOL, rv);
 347   }
 348
 349   return rv;
 350 }
 351
 352 void WebSocketTransportClientSocketPool::RequestSockets(
 353     const std::string& group_name,
 354     const void* params,
 355     int num_sockets,
 356     const BoundNetLog& net_log) {
 357   NOTIMPLEMENTED();
 358 }
 359
 360 void WebSocketTransportClientSocketPool::CancelRequest(
 361     const std::string& group_name,
 362     ClientSocketHandle* handle) {
 363   DCHECK(!handle->is_initialized());
 364   if (DeleteStalledRequest(handle))
 365     return;
 366   scoped_ptr<StreamSocket> socket = handle->PassSocket();
 367   if (socket)
 368     ReleaseSocket(handle->group_name(), socket.Pass(), handle->id());
 369   if (!DeleteJob(handle))
 370     pending_callbacks_.erase(handle);
 371   if (!ReachedMaxSocketsLimit() && !stalled_request_queue_.empty())
 372     ActivateStalledRequest();
 373 }
 374
 375 void WebSocketTransportClientSocketPool::ReleaseSocket(
 376     const std::string& group_name,
 377     scoped_ptr<StreamSocket> socket,
 378     int id) {
 379   WebSocketEndpointLockManager::GetInstance()->UnlockSocket(socket.get());
 380   CHECK_GT(handed_out_socket_count_, 0);
 381   --handed_out_socket_count_;
 382   if (!ReachedMaxSocketsLimit() && !stalled_request_queue_.empty())
 383     ActivateStalledRequest();
 384 }
 385
 386 void WebSocketTransportClientSocketPool::FlushWithError(int error) {
 387   // Sockets which are in LOAD_STATE_CONNECTING are in danger of unlocking
 388   // sockets waiting for the endpoint lock. If they connected synchronously,
 389   // then OnConnectJobComplete(). The |flushing_| flag tells this object to
 390   // ignore spurious calls to OnConnectJobComplete(). It is safe to ignore those
 391   // calls because this method will delete the jobs and call their callbacks
 392   // anyway.
 393   flushing_ = true;
 394   for (PendingConnectsMap::iterator it = pending_connects_.begin();
 395        it != pending_connects_.end();
 396        ++it) {
 397     InvokeUserCallbackLater(
 398         it->second->handle(), it->second->callback(), error);
 399     delete it->second, it->second = NULL;
 400   }
 401   pending_connects_.clear();
 402   for (StalledRequestQueue::iterator it = stalled_request_queue_.begin();
 403        it != stalled_request_queue_.end();
 404        ++it) {
 405     InvokeUserCallbackLater(it->handle, it->callback, error);
 406   }
 407   stalled_request_map_.clear();
 408   stalled_request_queue_.clear();
 409   flushing_ = false;
 410 }
 411
 412 void WebSocketTransportClientSocketPool::CloseIdleSockets() {
 413   // We have no idle sockets.
 414 }
 415
 416 int WebSocketTransportClientSocketPool::IdleSocketCount() const {
 417   return 0;
 418 }
 419
 420 int WebSocketTransportClientSocketPool::IdleSocketCountInGroup(
 421     const std::string& group_name) const {
 422   return 0;
 423 }
 424
 425 LoadState WebSocketTransportClientSocketPool::GetLoadState(
 426     const std::string& group_name,
 427     const ClientSocketHandle* handle) const {
 428   if (stalled_request_map_.find(handle) != stalled_request_map_.end())
 429     return LOAD_STATE_WAITING_FOR_AVAILABLE_SOCKET;
 430   if (pending_callbacks_.count(handle))
 431     return LOAD_STATE_CONNECTING;
 432   return LookupConnectJob(handle)->GetLoadState();
 433 }
 434
 435 scoped_ptr<base::DictionaryValue>
 436     WebSocketTransportClientSocketPool::GetInfoAsValue(
 437         const std::string& name,
 438         const std::string& type,
 439         bool include_nested_pools) const {
 440   scoped_ptr<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.Pass();
 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   owner_->OnConnectJobComplete(result,
 627                                static_cast<WebSocketTransportConnectJob*>(job));
 628 }
 629
 630 WebSocketTransportClientSocketPool::StalledRequest::StalledRequest(
 631     const scoped_refptr<TransportSocketParams>& params,
 632     RequestPriority priority,
 633     ClientSocketHandle* handle,
 634     const CompletionCallback& callback,
 635     const BoundNetLog& net_log)
 636     : params(params),
 637       priority(priority),
 638       handle(handle),
 639       callback(callback),
 640       net_log(net_log) {}
 641
 642 WebSocketTransportClientSocketPool::StalledRequest::~StalledRequest() {}
 643
 644 }  // namespace net