Create WebSocketTransportClientSocketPool

net/socket/websocket_transport_client_socket_pool.cc

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "net/socket/websocket_transport_client_socket_pool.h"
+
+#include <algorithm>
+
+#include "base/compiler_specific.h"
+#include "base/logging.h"
+#include "base/numerics/safe_conversions.h"
+#include "base/strings/string_util.h"
+#include "base/time/time.h"
+#include "base/values.h"
+#include "net/base/net_errors.h"
+#include "net/base/net_log.h"
+#include "net/socket/client_socket_handle.h"
+#include "net/socket/client_socket_pool_base.h"
+#include "net/socket/websocket_endpoint_lock_manager.h"
+#include "net/socket/websocket_transport_connect_sub_job.h"
+
+namespace net {
+
+namespace {
+
+using base::TimeDelta;
+
+// TODO(ricea): For now, we implement a global timeout for compatability with
+// TransportConnectJob. Since WebSocketTransportConnectJob controls the address
+// selection process more tightly, it could do something smarter here.
+const int kTransportConnectJobTimeoutInSeconds = 240;  // 4 minutes.
+
+}  // namespace
+
+WebSocketTransportConnectJob::WebSocketTransportConnectJob(
+    const std::string& group_name,
+    RequestPriority priority,
+    const scoped_refptr<TransportSocketParams>& params,
+    TimeDelta timeout_duration,
+    const CompletionCallback& callback,
+    ClientSocketFactory* client_socket_factory,
+    HostResolver* host_resolver,
+    ClientSocketHandle* handle,
+    Delegate* delegate,
+    NetLog* pool_net_log,
+    const BoundNetLog& request_net_log)
+    : ConnectJob(group_name,
+                 timeout_duration,
+                 priority,
+                 delegate,
+                 BoundNetLog::Make(pool_net_log, NetLog::SOURCE_CONNECT_JOB)),
+      helper_(params, client_socket_factory, host_resolver, &connect_timing_),
+      race_result_(TransportConnectJobHelper::CONNECTION_LATENCY_UNKNOWN),
+      handle_(handle),
+      callback_(callback),
+      request_net_log_(request_net_log),
+      had_ipv4_(false),
+      had_ipv6_(false) {
+  helper_.SetOnIOComplete(this);
+}
+
+WebSocketTransportConnectJob::~WebSocketTransportConnectJob() {}
+
+LoadState WebSocketTransportConnectJob::GetLoadState() const {
+  LoadState load_state = LOAD_STATE_RESOLVING_HOST;
+  if (ipv6_job_)
+    load_state = ipv6_job_->GetLoadState();
+  // This method should return LOAD_STATE_CONNECTING in preference to
+  // LOAD_STATE_WAITING_FOR_AVAILABLE_SOCKET when possible because "waiting for
+  // available socket" implies that nothing is happening.
+  if (ipv4_job_ && load_state != LOAD_STATE_CONNECTING)
+    load_state = ipv4_job_->GetLoadState();
+  return load_state;
+}
+
+int WebSocketTransportConnectJob::DoResolveHost() {
+  return helper_.DoResolveHost(priority(), net_log());
+}
+
+int WebSocketTransportConnectJob::DoResolveHostComplete(int result) {
+  return helper_.DoResolveHostComplete(result, net_log());
+}
+
+int WebSocketTransportConnectJob::DoTransportConnect() {
+  AddressList ipv4_addresses;
+  AddressList ipv6_addresses;
+  int result = ERR_UNEXPECTED;
+  helper_.set_next_state(
+      TransportConnectJobHelper::STATE_TRANSPORT_CONNECT_COMPLETE);
+
+  for (AddressList::const_iterator it = helper_.addresses().begin();
+       it != helper_.addresses().end();
+       ++it) {
+    switch (it->GetFamily()) {
+      case ADDRESS_FAMILY_IPV4:
+        ipv4_addresses.push_back(*it);
+        break;
+
+      case ADDRESS_FAMILY_IPV6:
+        ipv6_addresses.push_back(*it);
+        break;
+
+      default:
+        DVLOG(1) << "Unexpected ADDRESS_FAMILY: " << it->GetFamily();
+        break;
+    }
+  }
+
+  if (!ipv4_addresses.empty()) {
+    had_ipv4_ = true;
+    ipv4_job_.reset(new WebSocketTransportConnectSubJob(
+        ipv4_addresses, this, SUB_JOB_IPV4));
+  }
+
+  if (!ipv6_addresses.empty()) {
+    had_ipv6_ = true;
+    ipv6_job_.reset(new WebSocketTransportConnectSubJob(
+        ipv6_addresses, this, SUB_JOB_IPV6));
+    result = ipv6_job_->Start();
+    switch (result) {
+      case OK:
+        SetSocket(ipv6_job_->PassSocket());
+        race_result_ =
+            had_ipv4_
+                ? TransportConnectJobHelper::CONNECTION_LATENCY_IPV6_RACEABLE
+                : TransportConnectJobHelper::CONNECTION_LATENCY_IPV6_SOLO;
+        return result;
+
+      case ERR_IO_PENDING:
+        if (ipv4_job_) {
+          // This use of base::Unretained is safe because |fallback_timer_| is
+          // owned by this object.
+          fallback_timer_.Start(
+              FROM_HERE,
+              TimeDelta::FromMilliseconds(
+                  TransportConnectJobHelper::kIPv6FallbackTimerInMs),
+              base::Bind(&WebSocketTransportConnectJob::StartIPv4JobAsync,
+                         base::Unretained(this)));
+        }
+        return result;
+
+      default:
+        ipv6_job_.reset();
+    }
+  }
+
+  DCHECK(!ipv6_job_);
+  if (ipv4_job_) {
+    result = ipv4_job_->Start();
+    if (result == OK) {
+      SetSocket(ipv4_job_->PassSocket());
+      race_result_ =
+          had_ipv6_
+              ? TransportConnectJobHelper::CONNECTION_LATENCY_IPV4_WINS_RACE
+              : TransportConnectJobHelper::CONNECTION_LATENCY_IPV4_NO_RACE;
+    }
+  }
+
+  return result;
+}
+
+int WebSocketTransportConnectJob::DoTransportConnectComplete(int result) {
+  if (result == OK)
+    helper_.HistogramDuration(race_result_);
+  return result;
+}
+
+void WebSocketTransportConnectJob::OnSubJobComplete(
+    int result,
+    WebSocketTransportConnectSubJob* job) {
+  if (result == OK) {
+    switch (job->type()) {
+      case SUB_JOB_IPV4:
+        race_result_ =
+            had_ipv6_
+                ? TransportConnectJobHelper::CONNECTION_LATENCY_IPV4_WINS_RACE
+                : TransportConnectJobHelper::CONNECTION_LATENCY_IPV4_NO_RACE;
+        break;
+
+      case SUB_JOB_IPV6:
+        race_result_ =
+            had_ipv4_
+                ? TransportConnectJobHelper::CONNECTION_LATENCY_IPV6_RACEABLE
+                : TransportConnectJobHelper::CONNECTION_LATENCY_IPV6_SOLO;
+        break;
+    }
+    SetSocket(job->PassSocket());
+
+    // Make sure all connections are cancelled even if this object fails to be
+    // deleted.
+    ipv4_job_.reset();
+    ipv6_job_.reset();
+  } else {
+    switch (job->type()) {
+      case SUB_JOB_IPV4:
+        ipv4_job_.reset();
+        break;
+
+      case SUB_JOB_IPV6:
+        ipv6_job_.reset();
+        if (ipv4_job_ && !ipv4_job_->started()) {
+          fallback_timer_.Stop();
+          result = ipv4_job_->Start();
+          if (result != ERR_IO_PENDING) {
+            OnSubJobComplete(result, ipv4_job_.get());
+            return;
+          }
+        }
+        break;
+    }
+    if (ipv4_job_ || ipv6_job_)
+      return;
+  }
+  helper_.OnIOComplete(this, result);
+}
+
+void WebSocketTransportConnectJob::StartIPv4JobAsync() {
+  DCHECK(ipv4_job_);
+  int result = ipv4_job_->Start();
+  if (result != ERR_IO_PENDING)
+    OnSubJobComplete(result, ipv4_job_.get());
+}
+
+int WebSocketTransportConnectJob::ConnectInternal() {
+  return helper_.DoConnectInternal(this);
+}
+
+WebSocketTransportClientSocketPool::WebSocketTransportClientSocketPool(
+    int max_sockets,
+    int max_sockets_per_group,
+    ClientSocketPoolHistograms* histograms,
+    HostResolver* host_resolver,
+    ClientSocketFactory* client_socket_factory,
+    NetLog* net_log)
+    : TransportClientSocketPool(max_sockets,
+                                max_sockets_per_group,
+                                histograms,
+                                host_resolver,
+                                client_socket_factory,
+                                net_log),
+      connect_job_delegate_(this),
+      histograms_(histograms),
+      pool_net_log_(net_log),
+      client_socket_factory_(client_socket_factory),
+      host_resolver_(host_resolver),
+      max_sockets_(max_sockets),
+      handed_out_socket_count_(0),
+      flushing_(false),
+      weak_factory_(this) {}
+
+WebSocketTransportClientSocketPool::~WebSocketTransportClientSocketPool() {
+  // Clean up any pending connect jobs.
+  FlushWithError(ERR_ABORTED);
+  DCHECK(pending_connects_.empty());
+  DCHECK_EQ(0, handed_out_socket_count_);
+  DCHECK(stalled_request_queue_.empty());
+  DCHECK(stalled_request_map_.empty());
+}
+
+// static
+void WebSocketTransportClientSocketPool::UnlockEndpoint(
+    ClientSocketHandle* handle) {
+  DCHECK(handle->is_initialized());
+  WebSocketEndpointLockManager::GetInstance()->UnlockSocket(handle->socket());
+}
+
+int WebSocketTransportClientSocketPool::RequestSocket(
+    const std::string& group_name,
+    const void* params,
+    RequestPriority priority,
+    ClientSocketHandle* handle,
+    const CompletionCallback& callback,
+    const BoundNetLog& request_net_log) {
+  DCHECK(params);
+  const scoped_refptr<TransportSocketParams>& casted_params =
+      *static_cast<const scoped_refptr<TransportSocketParams>*>(params);
+
+  NetLogTcpClientSocketPoolRequestedSocket(request_net_log, &casted_params);
+
+  CHECK(!callback.is_null());
+  CHECK(handle);
+
+  request_net_log.BeginEvent(NetLog::TYPE_SOCKET_POOL);
+
+  if (ReachedMaxSocketsLimit() && !casted_params->ignore_limits()) {
+    request_net_log.AddEvent(NetLog::TYPE_SOCKET_POOL_STALLED_MAX_SOCKETS);
+    // TODO(ricea): Use emplace_back when C++11 becomes allowed.
+    StalledRequest request(
+        casted_params, priority, handle, callback, request_net_log);
+    stalled_request_queue_.push_back(request);
+    StalledRequestQueue::iterator iterator = stalled_request_queue_.end();
+    --iterator;
+    DCHECK_EQ(handle, iterator->handle);
+    // Because StalledRequestQueue is a std::list, its iterators are guaranteed
+    // to remain valid as long as the elements are not removed. As long as
+    // stalled_request_queue_ and stalled_request_map_ are updated in sync, it
+    // is safe to dereference an iterator in stalled_request_map_ to find the
+    // corresponding list element.
+    stalled_request_map_.insert(
+        StalledRequestMap::value_type(handle, iterator));
+    return ERR_IO_PENDING;
+  }
+
+  scoped_ptr<WebSocketTransportConnectJob> connect_job(
+      new WebSocketTransportConnectJob(group_name,
+                                       priority,
+                                       casted_params,
+                                       ConnectionTimeout(),
+                                       callback,
+                                       client_socket_factory_,
+                                       host_resolver_,
+                                       handle,
+                                       &connect_job_delegate_,
+                                       pool_net_log_,
+                                       request_net_log));
+
+  int rv = connect_job->Connect();
+  // Regardless of the outcome of |connect_job|, it will always be bound to
+  // |handle|, since this pool uses early-binding. So the binding is logged
+  // here, without waiting for the result.
+  request_net_log.AddEvent(
+      NetLog::TYPE_SOCKET_POOL_BOUND_TO_CONNECT_JOB,
+      connect_job->net_log().source().ToEventParametersCallback());
+  if (rv == OK) {
+    HandOutSocket(connect_job->PassSocket(),
+                  connect_job->connect_timing(),
+                  handle,
+                  request_net_log);
+    request_net_log.EndEvent(NetLog::TYPE_SOCKET_POOL);
+  } else if (rv == ERR_IO_PENDING) {
+    // TODO(ricea): Implement backup job timer?
+    AddJob(handle, connect_job.Pass());
+  } else {
+    scoped_ptr<StreamSocket> error_socket;
+    connect_job->GetAdditionalErrorState(handle);
+    error_socket = connect_job->PassSocket();
+    if (error_socket) {
+      HandOutSocket(error_socket.Pass(),
+                    connect_job->connect_timing(),
+                    handle,
+                    request_net_log);
+    }
+  }
+
+  if (rv != ERR_IO_PENDING) {
+    request_net_log.EndEventWithNetErrorCode(NetLog::TYPE_SOCKET_POOL, rv);
+  }
+
+  return rv;
+}
+
+void WebSocketTransportClientSocketPool::RequestSockets(
+    const std::string& group_name,
+    const void* params,
+    int num_sockets,
+    const BoundNetLog& net_log) {
+  NOTIMPLEMENTED();
+}
+
+void WebSocketTransportClientSocketPool::CancelRequest(
+    const std::string& group_name,
+    ClientSocketHandle* handle) {
+  if (DeleteStalledRequest(handle))
+    return;
+  if (!DeleteJob(handle))
+    pending_callbacks_.erase(handle);
+  if (!ReachedMaxSocketsLimit() && !stalled_request_queue_.empty())
+    ActivateStalledRequest();
+}
+
+void WebSocketTransportClientSocketPool::ReleaseSocket(
+    const std::string& group_name,
+    scoped_ptr<StreamSocket> socket,
+    int id) {
+  WebSocketEndpointLockManager::GetInstance()->UnlockSocket(socket.get());
+  CHECK_GT(handed_out_socket_count_, 0);
+  --handed_out_socket_count_;
+  if (!ReachedMaxSocketsLimit() && !stalled_request_queue_.empty())
+    ActivateStalledRequest();
+}
+
+void WebSocketTransportClientSocketPool::FlushWithError(int error) {
+  // Sockets which are in LOAD_STATE_CONNECTING are in danger of unlocking
+  // sockets waiting for the endpoint lock. If they connected synchronously,
+  // then OnConnectJobComplete(). The |flushing_| flag tells this object to
+  // ignore spurious calls to OnConnectJobComplete(). It is safe to ignore those
+  // calls because this method will delete the jobs and call their callbacks
+  // anyway.
+  flushing_ = true;
+  for (PendingConnectsMap::iterator it = pending_connects_.begin();
+       it != pending_connects_.end();
+       ++it) {
+    InvokeUserCallbackLater(
+        it->second->handle(), it->second->callback(), error);
+    delete it->second, it->second = NULL;
+  }
+  pending_connects_.clear();
+  for (StalledRequestQueue::iterator it = stalled_request_queue_.begin();
+       it != stalled_request_queue_.end();
+       ++it) {
+    InvokeUserCallbackLater(it->handle, it->callback, error);
+  }
+  stalled_request_map_.clear();
+  stalled_request_queue_.clear();
+  handed_out_socket_count_ = 0;
+  flushing_ = false;
+}
+
+void WebSocketTransportClientSocketPool::CloseIdleSockets() {
+  // We have no idle sockets.
+}
+
+int WebSocketTransportClientSocketPool::IdleSocketCount() const {
+  return 0;
+}
+
+int WebSocketTransportClientSocketPool::IdleSocketCountInGroup(
+    const std::string& group_name) const {
+  return 0;
+}
+
+LoadState WebSocketTransportClientSocketPool::GetLoadState(
+    const std::string& group_name,
+    const ClientSocketHandle* handle) const {
+  if (stalled_request_map_.find(handle) != stalled_request_map_.end())
+    return LOAD_STATE_WAITING_FOR_AVAILABLE_SOCKET;
+  if (pending_callbacks_.count(handle))
+    return LOAD_STATE_CONNECTING;
+  return LookupConnectJob(handle)->GetLoadState();
+}
+
+base::DictionaryValue* WebSocketTransportClientSocketPool::GetInfoAsValue(
+    const std::string& name,
+    const std::string& type,
+    bool include_nested_pools) const {
+  base::DictionaryValue* dict = new base::DictionaryValue();
+  dict->SetString("name", name);
+  dict->SetString("type", type);
+  dict->SetInteger("handed_out_socket_count", handed_out_socket_count_);
+  dict->SetInteger("connecting_socket_count", pending_connects_.size());
+  dict->SetInteger("idle_socket_count", 0);
+  dict->SetInteger("max_socket_count", max_sockets_);
+  dict->SetInteger("max_sockets_per_group", max_sockets_);
+  dict->SetInteger("pool_generation_number", 0);
+  return dict;
+}
+
+TimeDelta WebSocketTransportClientSocketPool::ConnectionTimeout() const {
+  return TimeDelta::FromSeconds(kTransportConnectJobTimeoutInSeconds);
+}
+
+ClientSocketPoolHistograms* WebSocketTransportClientSocketPool::histograms()
+    const {
+  return histograms_;
+}
+
+bool WebSocketTransportClientSocketPool::IsStalled() const {
+  return !stalled_request_queue_.empty();
+}
+
+void WebSocketTransportClientSocketPool::OnConnectJobComplete(
+    int result,
+    WebSocketTransportConnectJob* job) {
+  DCHECK_NE(ERR_IO_PENDING, result);
+
+  scoped_ptr<StreamSocket> socket = job->PassSocket();
+
+  // See comment in FlushWithError.
+  if (flushing_) {
+    WebSocketEndpointLockManager::GetInstance()->UnlockSocket(socket.get());
+    return;
+  }
+
+  BoundNetLog request_net_log = job->request_net_log();
+  CompletionCallback callback = job->callback();
+  LoadTimingInfo::ConnectTiming connect_timing = job->connect_timing();
+
+  ClientSocketHandle* const handle = job->handle();
+  bool handed_out_socket = false;
+
+  if (result == OK) {
+    DCHECK(socket.get());
+    handed_out_socket = true;
+    HandOutSocket(socket.Pass(), connect_timing, handle, request_net_log);
+    request_net_log.EndEvent(NetLog::TYPE_SOCKET_POOL);
+  } else {
+    // If we got a socket, it must contain error information so pass that
+    // up so that the caller can retrieve it.
+    job->GetAdditionalErrorState(handle);
+    if (socket.get()) {
+      handed_out_socket = true;
+      HandOutSocket(socket.Pass(), connect_timing, handle, request_net_log);
+    }
+    request_net_log.EndEventWithNetErrorCode(NetLog::TYPE_SOCKET_POOL, result);
+  }
+  bool delete_succeeded = DeleteJob(handle);
+  DCHECK(delete_succeeded);
+  if (!handed_out_socket && !stalled_request_queue_.empty() &&
+      !ReachedMaxSocketsLimit())
+    ActivateStalledRequest();
+  InvokeUserCallbackLater(handle, callback, result);
+}
+
+void WebSocketTransportClientSocketPool::InvokeUserCallbackLater(
+    ClientSocketHandle* handle,
+    const CompletionCallback& callback,
+    int rv) {
+  DCHECK(!pending_callbacks_.count(handle));
+  pending_callbacks_.insert(handle);
+  base::MessageLoop::current()->PostTask(
+      FROM_HERE,
+      base::Bind(&WebSocketTransportClientSocketPool::InvokeUserCallback,
+                 weak_factory_.GetWeakPtr(),
+                 handle,
+                 callback,
+                 rv));
+}
+
+void WebSocketTransportClientSocketPool::InvokeUserCallback(
+    ClientSocketHandle* handle,
+    const CompletionCallback& callback,
+    int rv) {
+  if (pending_callbacks_.erase(handle))
+    callback.Run(rv);
+}
+
+bool WebSocketTransportClientSocketPool::ReachedMaxSocketsLimit() const {
+  return handed_out_socket_count_ >= max_sockets_ ||
+         base::checked_cast<int>(pending_connects_.size()) >=
+             max_sockets_ - handed_out_socket_count_;
+}
+
+void WebSocketTransportClientSocketPool::HandOutSocket(
+    scoped_ptr<StreamSocket> socket,
+    const LoadTimingInfo::ConnectTiming& connect_timing,
+    ClientSocketHandle* handle,
+    const BoundNetLog& net_log) {
+  DCHECK(socket);
+  handle->SetSocket(socket.Pass());
+  DCHECK_EQ(ClientSocketHandle::UNUSED, handle->reuse_type());
+  DCHECK_EQ(0, handle->idle_time().InMicroseconds());
+  handle->set_pool_id(0);
+  handle->set_connect_timing(connect_timing);
+
+  net_log.AddEvent(
+      NetLog::TYPE_SOCKET_POOL_BOUND_TO_SOCKET,
+      handle->socket()->NetLog().source().ToEventParametersCallback());
+
+  ++handed_out_socket_count_;
+}
+
+void WebSocketTransportClientSocketPool::AddJob(
+    ClientSocketHandle* handle,
+    scoped_ptr<WebSocketTransportConnectJob> connect_job) {
+  bool inserted =
+      pending_connects_.insert(PendingConnectsMap::value_type(
+                                   handle, connect_job.release())).second;
+  DCHECK(inserted);
+}
+
+bool WebSocketTransportClientSocketPool::DeleteJob(ClientSocketHandle* handle) {
+  PendingConnectsMap::iterator it = pending_connects_.find(handle);
+  if (it == pending_connects_.end())
+    return false;
+  // Deleting a ConnectJob which holds an endpoint lock can lead to a different
+  // ConnectJob proceeding to connect. If the connect proceeds synchronously
+  // (usually because of a failure) then it can trigger that job to be
+  // deleted. |it| remains valid because std::map guarantees that erase() does
+  // not invalid iterators to other entries.
+  delete it->second, it->second = NULL;
+  DCHECK(pending_connects_.find(handle) == it);
+  pending_connects_.erase(it);
+  return true;
+}
+
+const WebSocketTransportConnectJob*
+WebSocketTransportClientSocketPool::LookupConnectJob(
+    const ClientSocketHandle* handle) const {
+  PendingConnectsMap::const_iterator it = pending_connects_.find(handle);
+  CHECK(it != pending_connects_.end());
+  return it->second;
+}
+
+void WebSocketTransportClientSocketPool::ActivateStalledRequest() {
+  DCHECK(!stalled_request_queue_.empty());
+  DCHECK(!ReachedMaxSocketsLimit());
+  // Usually we will only be able to activate one stalled request at a time,
+  // however if all the connects fail synchronously for some reason, we may be
+  // able to clear the whole queue at once.
+  while (!stalled_request_queue_.empty() && !ReachedMaxSocketsLimit()) {
+    StalledRequest request(stalled_request_queue_.front());
+    stalled_request_queue_.pop_front();
+    stalled_request_map_.erase(request.handle);
+    int rv = RequestSocket("ignored",
+                           &request.params,
+                           request.priority,
+                           request.handle,
+                           request.callback,
+                           request.net_log);
+    // ActivateStalledRequest() never returns synchronously, so it is never
+    // called re-entrantly.
+    if (rv != ERR_IO_PENDING)
+      InvokeUserCallbackLater(request.handle, request.callback, rv);
+  }
+}
+
+bool WebSocketTransportClientSocketPool::DeleteStalledRequest(
+    ClientSocketHandle* handle) {
+  StalledRequestMap::iterator it = stalled_request_map_.find(handle);
+  if (it == stalled_request_map_.end())
+    return false;
+  stalled_request_queue_.erase(it->second);
+  stalled_request_map_.erase(it);
+  return true;
+}
+
+WebSocketTransportClientSocketPool::ConnectJobDelegate::ConnectJobDelegate(
+    WebSocketTransportClientSocketPool* owner)
+    : owner_(owner) {}
+
+WebSocketTransportClientSocketPool::ConnectJobDelegate::~ConnectJobDelegate() {}
+
+void
+WebSocketTransportClientSocketPool::ConnectJobDelegate::OnConnectJobComplete(
+    int result,
+    ConnectJob* job) {
+  owner_->OnConnectJobComplete(result,
+                               static_cast<WebSocketTransportConnectJob*>(job));
+}
+
+WebSocketTransportClientSocketPool::StalledRequest::StalledRequest(
+    const scoped_refptr<TransportSocketParams>& params,
+    RequestPriority priority,
+    ClientSocketHandle* handle,
+    const CompletionCallback& callback,
+    const BoundNetLog& net_log)
+    : params(params),
+      priority(priority),
+      handle(handle),
+      callback(callback),
+      net_log(net_log) {}
+
+WebSocketTransportClientSocketPool::StalledRequest::~StalledRequest() {}
+
+}  // namespace net