net/socket/client_socket_pool_base_unittest.cc

// Copyright (c) 2012 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/client_socket_pool_base.h"

#include <stdint.h>
#include <utility>
#include <vector>

#include "base/bind.h"
#include "base/bind_helpers.h"
#include "base/callback.h"
#include "base/location.h"
#include "base/logging.h"
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/memory/weak_ptr.h"
#include "base/message_loop/message_loop.h"
#include "base/run_loop.h"
#include "base/single_thread_task_runner.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/stringprintf.h"
#include "base/test/histogram_tester.h"
#include "base/threading/platform_thread.h"
#include "base/threading/thread_task_runner_handle.h"
#include "base/values.h"
#include "net/base/load_timing_info.h"
#include "net/base/load_timing_info_test_util.h"
#include "net/base/net_errors.h"
#include "net/base/request_priority.h"
#include "net/base/test_completion_callback.h"
#include "net/http/http_response_headers.h"
#include "net/log/net_log.h"
#include "net/log/net_log_event_type.h"
#include "net/log/net_log_source.h"
#include "net/log/net_log_source_type.h"
#include "net/log/test_net_log.h"
#include "net/log/test_net_log_entry.h"
#include "net/log/test_net_log_util.h"
#include "net/socket/client_socket_factory.h"
#include "net/socket/client_socket_handle.h"
#include "net/socket/datagram_client_socket.h"
#include "net/socket/socket_performance_watcher.h"
#include "net/socket/socket_test_util.h"
#include "net/socket/ssl_client_socket.h"
#include "net/socket/stream_socket.h"
#include "net/test/gtest_util.h"
#include "testing/gmock/include/gmock/gmock.h"
#include "testing/gtest/include/gtest/gtest.h"

using net::test::IsError;
using net::test::IsOk;

using ::testing::Invoke;
using ::testing::Return;

namespace net {

namespace {

const int kDefaultMaxSockets = 4;
const int kDefaultMaxSocketsPerGroup = 2;
const char kIdleSocketFateHistogram[] = "Net.Socket.IdleSocketFate";

// Make sure |handle| sets load times correctly when it has been assigned a
// reused socket.
void TestLoadTimingInfoConnectedReused(const ClientSocketHandle& handle) {
  LoadTimingInfo load_timing_info;
  // Only pass true in as |is_reused|, as in general, HttpStream types should
  // have stricter concepts of reuse than socket pools.
  EXPECT_TRUE(handle.GetLoadTimingInfo(true, &load_timing_info));

  EXPECT_EQ(true, load_timing_info.socket_reused);
  EXPECT_NE(NetLogSource::kInvalidId, load_timing_info.socket_log_id);

  ExpectConnectTimingHasNoTimes(load_timing_info.connect_timing);
  ExpectLoadTimingHasOnlyConnectionTimes(load_timing_info);
}

// Make sure |handle| sets load times correctly when it has been assigned a
// fresh socket. Also runs TestLoadTimingInfoConnectedReused, since the owner
// of a connection where |is_reused| is false may consider the connection
// reused.
void TestLoadTimingInfoConnectedNotReused(const ClientSocketHandle& handle) {
  EXPECT_FALSE(handle.is_reused());

  LoadTimingInfo load_timing_info;
  EXPECT_TRUE(handle.GetLoadTimingInfo(false, &load_timing_info));

  EXPECT_FALSE(load_timing_info.socket_reused);
  EXPECT_NE(NetLogSource::kInvalidId, load_timing_info.socket_log_id);

  ExpectConnectTimingHasTimes(load_timing_info.connect_timing,
                              CONNECT_TIMING_HAS_CONNECT_TIMES_ONLY);
  ExpectLoadTimingHasOnlyConnectionTimes(load_timing_info);

  TestLoadTimingInfoConnectedReused(handle);
}

// Make sure |handle| sets load times correctly, in the case that it does not
// currently have a socket.
void TestLoadTimingInfoNotConnected(const ClientSocketHandle& handle) {
  // Should only be set to true once a socket is assigned, if at all.
  EXPECT_FALSE(handle.is_reused());

  LoadTimingInfo load_timing_info;
  EXPECT_FALSE(handle.GetLoadTimingInfo(false, &load_timing_info));

  EXPECT_FALSE(load_timing_info.socket_reused);
  EXPECT_EQ(NetLogSource::kInvalidId, load_timing_info.socket_log_id);

  ExpectConnectTimingHasNoTimes(load_timing_info.connect_timing);
  ExpectLoadTimingHasOnlyConnectionTimes(load_timing_info);
}

class TestSocketParams : public base::RefCounted<TestSocketParams> {
 public:
  explicit TestSocketParams() {}

 private:
  friend class base::RefCounted<TestSocketParams>;
  ~TestSocketParams() {}
};
typedef ClientSocketPoolBase<TestSocketParams> TestClientSocketPoolBase;

class MockClientSocket : public StreamSocket {
 public:
  explicit MockClientSocket(net::NetLog* net_log)
      : connected_(false),
        has_unread_data_(false),
        net_log_(NetLogWithSource::Make(net_log, NetLogSourceType::SOCKET)),
        was_used_to_convey_data_(false) {}

  // Sets whether the socket has unread data. If true, the next call to Read()
  // will return 1 byte and IsConnectedAndIdle() will return false.
  void set_has_unread_data(bool has_unread_data) {
    has_unread_data_ = has_unread_data;
  }

  // Socket implementation.
  int Read(IOBuffer* /* buf */,
           int len,
           const CompletionCallback& /* callback */) override {
    if (has_unread_data_ && len > 0) {
      has_unread_data_ = false;
      was_used_to_convey_data_ = true;
      return 1;
    }
    return ERR_UNEXPECTED;
  }

  int Write(IOBuffer* /* buf */,
            int len,
            const CompletionCallback& /* callback */) override {
    was_used_to_convey_data_ = true;
    return len;
  }
  int SetReceiveBufferSize(int32_t size) override { return OK; }
  int SetSendBufferSize(int32_t size) override { return OK; }

  // StreamSocket implementation.
  int Connect(const CompletionCallback& callback) override {
    connected_ = true;
    return OK;
  }

  void Disconnect() override { connected_ = false; }
  bool IsConnected() const override { return connected_; }
  bool IsConnectedAndIdle() const override {
    return connected_ && !has_unread_data_;
  }

  int GetPeerAddress(IPEndPoint* /* address */) const override {
    return ERR_UNEXPECTED;
  }

  int GetLocalAddress(IPEndPoint* /* address */) const override {
    return ERR_UNEXPECTED;
  }

  const NetLogWithSource& NetLog() const override { return net_log_; }

  void SetSubresourceSpeculation() override {}
  void SetOmniboxSpeculation() override {}
  bool WasEverUsed() const override { return was_used_to_convey_data_; }
  bool WasAlpnNegotiated() const override { return false; }
  NextProto GetNegotiatedProtocol() const override { return kProtoUnknown; }
  bool GetSSLInfo(SSLInfo* ssl_info) override { return false; }
  void GetConnectionAttempts(ConnectionAttempts* out) const override {
    out->clear();
  }
  void ClearConnectionAttempts() override {}
  void AddConnectionAttempts(const ConnectionAttempts& attempts) override {}
  int64_t GetTotalReceivedBytes() const override {
    NOTIMPLEMENTED();
    return 0;
  }

 private:
  bool connected_;
  bool has_unread_data_;
  NetLogWithSource net_log_;
  bool was_used_to_convey_data_;

  DISALLOW_COPY_AND_ASSIGN(MockClientSocket);
};

class TestConnectJob;

class MockClientSocketFactory : public ClientSocketFactory {
 public:
  MockClientSocketFactory() : allocation_count_(0) {}

  std::unique_ptr<DatagramClientSocket> CreateDatagramClientSocket(
      DatagramSocket::BindType bind_type,
      const RandIntCallback& rand_int_cb,
      NetLog* net_log,
      const NetLogSource& source) override {
    NOTREACHED();
    return std::unique_ptr<DatagramClientSocket>();
  }

  std::unique_ptr<StreamSocket> CreateTransportClientSocket(
      const AddressList& addresses,
      std::unique_ptr<
          SocketPerformanceWatcher> /* socket_performance_watcher */,
      NetLog* /* net_log */,
      const NetLogSource& /*source*/) override {
    allocation_count_++;
    return std::unique_ptr<StreamSocket>();
  }

  std::unique_ptr<SSLClientSocket> CreateSSLClientSocket(
      std::unique_ptr<ClientSocketHandle> transport_socket,
      const HostPortPair& host_and_port,
      const SSLConfig& ssl_config,
      const SSLClientSocketContext& context) override {
    NOTIMPLEMENTED();
    return std::unique_ptr<SSLClientSocket>();
  }

  void ClearSSLSessionCache() override { NOTIMPLEMENTED(); }

  void WaitForSignal(TestConnectJob* job) { waiting_jobs_.push_back(job); }

  void SignalJobs();

  void SignalJob(size_t job);

  void SetJobLoadState(size_t job, LoadState load_state);

  int allocation_count() const { return allocation_count_; }

 private:
  int allocation_count_;
  std::vector<TestConnectJob*> waiting_jobs_;
};

class TestConnectJob : public ConnectJob {
 public:
  enum JobType {
    kMockJob,
    kMockFailingJob,
    kMockPendingJob,
    kMockPendingFailingJob,
    kMockWaitingJob,
    kMockRecoverableJob,
    kMockPendingRecoverableJob,
    kMockAdditionalErrorStateJob,
    kMockPendingAdditionalErrorStateJob,
    kMockUnreadDataJob,
  };

  // The kMockPendingJob uses a slight delay before allowing the connect
  // to complete.
  static const int kPendingConnectDelay = 2;

  TestConnectJob(JobType job_type,
                 const std::string& group_name,
                 const TestClientSocketPoolBase::Request& request,
                 base::TimeDelta timeout_duration,
                 ConnectJob::Delegate* delegate,
                 MockClientSocketFactory* client_socket_factory,
                 NetLog* net_log)
      : ConnectJob(
            group_name,
            timeout_duration,
            request.priority(),
            request.respect_limits(),
            delegate,
            NetLogWithSource::Make(net_log,
                                   NetLogSourceType::TRANSPORT_CONNECT_JOB)),
        job_type_(job_type),
        client_socket_factory_(client_socket_factory),
        load_state_(LOAD_STATE_IDLE),
        store_additional_error_state_(false),
        weak_factory_(this) {}

  void Signal() {
    DoConnect(waiting_success_, true /* async */, false /* recoverable */);
  }

  void set_load_state(LoadState load_state) { load_state_ = load_state; }

  // From ConnectJob:

  LoadState GetLoadState() const override { return load_state_; }

  void GetAdditionalErrorState(ClientSocketHandle* handle) override {
    if (store_additional_error_state_) {
      // Set all of the additional error state fields in some way.
      handle->set_is_ssl_error(true);
      HttpResponseInfo info;
      info.headers = new HttpResponseHeaders(std::string());
      handle->set_ssl_error_response_info(info);
    }
  }

 private:
  // From ConnectJob:

  int ConnectInternal() override {
    AddressList ignored;
    client_socket_factory_->CreateTransportClientSocket(ignored, NULL, NULL,
                                                        NetLogSource());
    SetSocket(std::unique_ptr<StreamSocket>(
        new MockClientSocket(net_log().net_log())));
    switch (job_type_) {
      case kMockJob:
        return DoConnect(true /* successful */, false /* sync */,
                         false /* recoverable */);
      case kMockFailingJob:
        return DoConnect(false /* error */, false /* sync */,
                         false /* recoverable */);
      case kMockPendingJob:
        set_load_state(LOAD_STATE_CONNECTING);

        // Depending on execution timings, posting a delayed task can result
        // in the task getting executed the at the earliest possible
        // opportunity or only after returning once from the message loop and
        // then a second call into the message loop. In order to make behavior
        // more deterministic, we change the default delay to 2ms. This should
        // always require us to wait for the second call into the message loop.
        //
        // N.B. The correct fix for this and similar timing problems is to
        // abstract time for the purpose of unittests. Unfortunately, we have
        // a lot of third-party components that directly call the various
        // time functions, so this change would be rather invasive.
        base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
            FROM_HERE,
            base::Bind(base::IgnoreResult(&TestConnectJob::DoConnect),
                       weak_factory_.GetWeakPtr(), true /* successful */,
                       true /* async */, false /* recoverable */),
            base::TimeDelta::FromMilliseconds(kPendingConnectDelay));
        return ERR_IO_PENDING;
      case kMockPendingFailingJob:
        set_load_state(LOAD_STATE_CONNECTING);
        base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
            FROM_HERE,
            base::Bind(base::IgnoreResult(&TestConnectJob::DoConnect),
                       weak_factory_.GetWeakPtr(), false /* error */,
                       true /* async */, false /* recoverable */),
            base::TimeDelta::FromMilliseconds(2));
        return ERR_IO_PENDING;
      case kMockWaitingJob:
        set_load_state(LOAD_STATE_CONNECTING);
        client_socket_factory_->WaitForSignal(this);
        waiting_success_ = true;
        return ERR_IO_PENDING;
      case kMockRecoverableJob:
        return DoConnect(false /* error */, false /* sync */,
                         true /* recoverable */);
      case kMockPendingRecoverableJob:
        set_load_state(LOAD_STATE_CONNECTING);
        base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
            FROM_HERE,
            base::Bind(base::IgnoreResult(&TestConnectJob::DoConnect),
                       weak_factory_.GetWeakPtr(), false /* error */,
                       true /* async */, true /* recoverable */),
            base::TimeDelta::FromMilliseconds(2));
        return ERR_IO_PENDING;
      case kMockAdditionalErrorStateJob:
        store_additional_error_state_ = true;
        return DoConnect(false /* error */, false /* sync */,
                         false /* recoverable */);
      case kMockPendingAdditionalErrorStateJob:
        set_load_state(LOAD_STATE_CONNECTING);
        store_additional_error_state_ = true;
        base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
            FROM_HERE,
            base::Bind(base::IgnoreResult(&TestConnectJob::DoConnect),
                       weak_factory_.GetWeakPtr(), false /* error */,
                       true /* async */, false /* recoverable */),
            base::TimeDelta::FromMilliseconds(2));
        return ERR_IO_PENDING;
      case kMockUnreadDataJob: {
        int ret = DoConnect(true /* successful */, false /* sync */,
                            false /* recoverable */);
        static_cast<MockClientSocket*>(socket())->set_has_unread_data(true);
        return ret;
      }
      default:
        NOTREACHED();
        SetSocket(std::unique_ptr<StreamSocket>());
        return ERR_FAILED;
    }
  }

  int DoConnect(bool succeed, bool was_async, bool recoverable) {
    int result = OK;
    if (succeed) {
      socket()->Connect(CompletionCallback());
    } else if (recoverable) {
      result = ERR_PROXY_AUTH_REQUESTED;
    } else {
      result = ERR_CONNECTION_FAILED;
      SetSocket(std::unique_ptr<StreamSocket>());
    }

    if (was_async)
      NotifyDelegateOfCompletion(result);
    return result;
  }

  bool waiting_success_;
  const JobType job_type_;
  MockClientSocketFactory* const client_socket_factory_;
  LoadState load_state_;
  bool store_additional_error_state_;

  base::WeakPtrFactory<TestConnectJob> weak_factory_;

  DISALLOW_COPY_AND_ASSIGN(TestConnectJob);
};

class TestConnectJobFactory
    : public TestClientSocketPoolBase::ConnectJobFactory {
 public:
  TestConnectJobFactory(MockClientSocketFactory* client_socket_factory,
                        NetLog* net_log)
      : job_type_(TestConnectJob::kMockJob),
        job_types_(NULL),
        client_socket_factory_(client_socket_factory),
        net_log_(net_log) {
  }

  ~TestConnectJobFactory() override {}

  void set_job_type(TestConnectJob::JobType job_type) { job_type_ = job_type; }

  void set_job_types(std::list<TestConnectJob::JobType>* job_types) {
    job_types_ = job_types;
    CHECK(!job_types_->empty());
  }

  void set_timeout_duration(base::TimeDelta timeout_duration) {
    timeout_duration_ = timeout_duration;
  }

  // ConnectJobFactory implementation.

  std::unique_ptr<ConnectJob> NewConnectJob(
      const std::string& group_name,
      const TestClientSocketPoolBase::Request& request,
      ConnectJob::Delegate* delegate) const override {
    EXPECT_TRUE(!job_types_ || !job_types_->empty());
    TestConnectJob::JobType job_type = job_type_;
    if (job_types_ && !job_types_->empty()) {
      job_type = job_types_->front();
      job_types_->pop_front();
    }
    return std::unique_ptr<ConnectJob>(
        new TestConnectJob(job_type, group_name, request, timeout_duration_,
                           delegate, client_socket_factory_, net_log_));
  }

  base::TimeDelta ConnectionTimeout() const override {
    return timeout_duration_;
  }

 private:
  TestConnectJob::JobType job_type_;
  std::list<TestConnectJob::JobType>* job_types_;
  base::TimeDelta timeout_duration_;
  MockClientSocketFactory* const client_socket_factory_;
  NetLog* net_log_;

  DISALLOW_COPY_AND_ASSIGN(TestConnectJobFactory);
};

class TestClientSocketPool : public ClientSocketPool {
 public:
  typedef TestSocketParams SocketParams;

  TestClientSocketPool(
      int max_sockets,
      int max_sockets_per_group,
      base::TimeDelta unused_idle_socket_timeout,
      base::TimeDelta used_idle_socket_timeout,
      TestClientSocketPoolBase::ConnectJobFactory* connect_job_factory)
      : base_(NULL,
              max_sockets,
              max_sockets_per_group,
              unused_idle_socket_timeout,
              used_idle_socket_timeout,
              connect_job_factory) {}

  ~TestClientSocketPool() override {}

  int RequestSocket(const std::string& group_name,
                    const void* params,
                    RequestPriority priority,
                    RespectLimits respect_limits,
                    ClientSocketHandle* handle,
                    const CompletionCallback& callback,
                    const NetLogWithSource& net_log) override {
    const scoped_refptr<TestSocketParams>* casted_socket_params =
        static_cast<const scoped_refptr<TestSocketParams>*>(params);
    return base_.RequestSocket(group_name, *casted_socket_params, priority,
                               respect_limits, handle, callback, net_log);
  }

  void RequestSockets(const std::string& group_name,
                      const void* params,
                      int num_sockets,
                      const NetLogWithSource& net_log) override {
    const scoped_refptr<TestSocketParams>* casted_params =
        static_cast<const scoped_refptr<TestSocketParams>*>(params);

    base_.RequestSockets(group_name, *casted_params, num_sockets, net_log);
  }

  void SetPriority(const std::string& group_name,
                   ClientSocketHandle* handle,
                   RequestPriority priority) override {
    base_.SetPriority(group_name, handle, priority);
  }

  void CancelRequest(const std::string& group_name,
                     ClientSocketHandle* handle) override {
    base_.CancelRequest(group_name, handle);
  }

  void ReleaseSocket(const std::string& group_name,
                     std::unique_ptr<StreamSocket> socket,
                     int id) override {
    base_.ReleaseSocket(group_name, std::move(socket), id);
  }

  void FlushWithError(int error) override { base_.FlushWithError(error); }

  bool IsStalled() const override { return base_.IsStalled(); }

  void CloseIdleSockets() override { base_.CloseIdleSockets(); }

  void CloseIdleSocketsInGroup(const std::string& group_name) override {
    base_.CloseIdleSocketsInGroup(group_name);
  }

  int IdleSocketCount() const override { return base_.idle_socket_count(); }

  int IdleSocketCountInGroup(const std::string& group_name) const override {
    return base_.IdleSocketCountInGroup(group_name);
  }

  LoadState GetLoadState(const std::string& group_name,
                         const ClientSocketHandle* handle) const override {
    return base_.GetLoadState(group_name, handle);
  }

  void AddHigherLayeredPool(HigherLayeredPool* higher_pool) override {
    base_.AddHigherLayeredPool(higher_pool);
  }

  void RemoveHigherLayeredPool(HigherLayeredPool* higher_pool) override {
    base_.RemoveHigherLayeredPool(higher_pool);
  }

  std::unique_ptr<base::DictionaryValue> GetInfoAsValue(
      const std::string& name,
      const std::string& type,
      bool include_nested_pools) const override {
    return base_.GetInfoAsValue(name, type);
  }

  base::TimeDelta ConnectionTimeout() const override {
    return base_.ConnectionTimeout();
  }

  const TestClientSocketPoolBase* base() const { return &base_; }

  int NumUnassignedConnectJobsInGroup(const std::string& group_name) const {
    return base_.NumUnassignedConnectJobsInGroup(group_name);
  }

  int NumConnectJobsInGroup(const std::string& group_name) const {
    return base_.NumConnectJobsInGroup(group_name);
  }

  int NumActiveSocketsInGroup(const std::string& group_name) const {
    return base_.NumActiveSocketsInGroup(group_name);
  }

  bool HasGroup(const std::string& group_name) const {
    return base_.HasGroup(group_name);
  }

  void CleanupTimedOutIdleSockets() { base_.CleanupIdleSockets(false); }

  void EnableConnectBackupJobs() { base_.EnableConnectBackupJobs(); }

  bool CloseOneIdleConnectionInHigherLayeredPool() {
    return base_.CloseOneIdleConnectionInHigherLayeredPool();
  }

 private:
  TestClientSocketPoolBase base_;

  DISALLOW_COPY_AND_ASSIGN(TestClientSocketPool);
};

}  // namespace

namespace {

void MockClientSocketFactory::SignalJobs() {
  for (std::vector<TestConnectJob*>::iterator it = waiting_jobs_.begin();
       it != waiting_jobs_.end(); ++it) {
    (*it)->Signal();
  }
  waiting_jobs_.clear();
}

void MockClientSocketFactory::SignalJob(size_t job) {
  ASSERT_LT(job, waiting_jobs_.size());
  waiting_jobs_[job]->Signal();
  waiting_jobs_.erase(waiting_jobs_.begin() + job);
}

void MockClientSocketFactory::SetJobLoadState(size_t job,
                                              LoadState load_state) {
  ASSERT_LT(job, waiting_jobs_.size());
  waiting_jobs_[job]->set_load_state(load_state);
}

class TestConnectJobDelegate : public ConnectJob::Delegate {
 public:
  TestConnectJobDelegate()
      : have_result_(false), waiting_for_result_(false), result_(OK) {}
  ~TestConnectJobDelegate() override {}

  void OnConnectJobComplete(int result, ConnectJob* job) override {
    result_ = result;
    std::unique_ptr<ConnectJob> owned_job(job);
    std::unique_ptr<StreamSocket> socket = owned_job->PassSocket();
    // socket.get() should be NULL iff result != OK
    EXPECT_EQ(socket == NULL, result != OK);
    have_result_ = true;
    if (waiting_for_result_)
      base::RunLoop::QuitCurrentWhenIdleDeprecated();
  }

  int WaitForResult() {
    DCHECK(!waiting_for_result_);
    while (!have_result_) {
      waiting_for_result_ = true;
      base::RunLoop().Run();
      waiting_for_result_ = false;
    }
    have_result_ = false;  // auto-reset for next callback
    return result_;
  }

 private:
  bool have_result_;
  bool waiting_for_result_;
  int result_;
};

class ClientSocketPoolBaseTest : public testing::Test {
 protected:
  ClientSocketPoolBaseTest() : params_(new TestSocketParams()) {
    connect_backup_jobs_enabled_ =
        internal::ClientSocketPoolBaseHelper::connect_backup_jobs_enabled();
    internal::ClientSocketPoolBaseHelper::set_connect_backup_jobs_enabled(true);
  }

  ~ClientSocketPoolBaseTest() override {
    internal::ClientSocketPoolBaseHelper::set_connect_backup_jobs_enabled(
        connect_backup_jobs_enabled_);
  }

  void CreatePool(int max_sockets, int max_sockets_per_group) {
    CreatePoolWithIdleTimeouts(
        max_sockets,
        max_sockets_per_group,
        ClientSocketPool::unused_idle_socket_timeout(),
        ClientSocketPool::used_idle_socket_timeout());
  }

  void CreatePoolWithIdleTimeouts(
      int max_sockets, int max_sockets_per_group,
      base::TimeDelta unused_idle_socket_timeout,
      base::TimeDelta used_idle_socket_timeout) {
    DCHECK(!pool_.get());
    connect_job_factory_ = new TestConnectJobFactory(&client_socket_factory_,
                                                     &net_log_);
    pool_.reset(new TestClientSocketPool(max_sockets,
                                         max_sockets_per_group,
                                         unused_idle_socket_timeout,
                                         used_idle_socket_timeout,
                                         connect_job_factory_));
  }

  int StartRequestWithIgnoreLimits(
      const std::string& group_name,
      RequestPriority priority,
      ClientSocketPool::RespectLimits respect_limits) {
    return test_base_.StartRequestUsingPool(pool_.get(), group_name, priority,
                                            respect_limits, params_);
  }

  int StartRequest(const std::string& group_name, RequestPriority priority) {
    return StartRequestWithIgnoreLimits(
        group_name, priority, ClientSocketPool::RespectLimits::ENABLED);
  }

  int GetOrderOfRequest(size_t index) const {
    return test_base_.GetOrderOfRequest(index);
  }

  bool ReleaseOneConnection(ClientSocketPoolTest::KeepAlive keep_alive) {
    return test_base_.ReleaseOneConnection(keep_alive);
  }

  void ReleaseAllConnections(ClientSocketPoolTest::KeepAlive keep_alive) {
    test_base_.ReleaseAllConnections(keep_alive);
  }

  TestSocketRequest* request(int i) { return test_base_.request(i); }
  size_t requests_size() const { return test_base_.requests_size(); }
  std::vector<std::unique_ptr<TestSocketRequest>>* requests() {
    return test_base_.requests();
  }
  // Only counts the requests that get sockets asynchronously;
  // synchronous completions are not registered by this count.
  size_t completion_count() const { return test_base_.completion_count(); }

  TestNetLog net_log_;
  bool connect_backup_jobs_enabled_;
  MockClientSocketFactory client_socket_factory_;
  TestConnectJobFactory* connect_job_factory_;
  scoped_refptr<TestSocketParams> params_;
  std::unique_ptr<TestClientSocketPool> pool_;
  ClientSocketPoolTest test_base_;
};

// Even though a timeout is specified, it doesn't time out on a synchronous
// completion.
TEST_F(ClientSocketPoolBaseTest, ConnectJob_NoTimeoutOnSynchronousCompletion) {
  TestConnectJobDelegate delegate;
  ClientSocketHandle ignored;
  TestClientSocketPoolBase::Request request(
      &ignored, CompletionCallback(), DEFAULT_PRIORITY,
      ClientSocketPool::RespectLimits::ENABLED,
      internal::ClientSocketPoolBaseHelper::NORMAL, params_,
      NetLogWithSource());
  std::unique_ptr<TestConnectJob> job(
      new TestConnectJob(TestConnectJob::kMockJob, "a", request,
                         base::TimeDelta::FromMicroseconds(1), &delegate,
                         &client_socket_factory_, NULL));
  EXPECT_THAT(job->Connect(), IsOk());
}

TEST_F(ClientSocketPoolBaseTest, ConnectJob_TimedOut) {
  TestConnectJobDelegate delegate;
  ClientSocketHandle ignored;
  TestNetLog log;

  TestClientSocketPoolBase::Request request(
      &ignored, CompletionCallback(), DEFAULT_PRIORITY,
      ClientSocketPool::RespectLimits::ENABLED,
      internal::ClientSocketPoolBaseHelper::NORMAL, params_,
      NetLogWithSource());
  // Deleted by TestConnectJobDelegate.
  TestConnectJob* job =
      new TestConnectJob(TestConnectJob::kMockPendingJob,
                         "a",
                         request,
                         base::TimeDelta::FromMicroseconds(1),
                         &delegate,
                         &client_socket_factory_,
                         &log);
  ASSERT_THAT(job->Connect(), IsError(ERR_IO_PENDING));
  base::PlatformThread::Sleep(base::TimeDelta::FromMilliseconds(1));
  EXPECT_THAT(delegate.WaitForResult(), IsError(ERR_TIMED_OUT));

  TestNetLogEntry::List entries;
  log.GetEntries(&entries);

  EXPECT_EQ(6u, entries.size());
  EXPECT_TRUE(LogContainsBeginEvent(entries, 0,
                                    NetLogEventType::SOCKET_POOL_CONNECT_JOB));
  EXPECT_TRUE(LogContainsBeginEvent(
      entries, 1, NetLogEventType::SOCKET_POOL_CONNECT_JOB_CONNECT));
  EXPECT_TRUE(LogContainsEvent(entries, 2,
                               NetLogEventType::CONNECT_JOB_SET_SOCKET,
                               NetLogEventPhase::NONE));
  EXPECT_TRUE(LogContainsEvent(
      entries, 3, NetLogEventType::SOCKET_POOL_CONNECT_JOB_TIMED_OUT,
      NetLogEventPhase::NONE));
  EXPECT_TRUE(LogContainsEndEvent(
      entries, 4, NetLogEventType::SOCKET_POOL_CONNECT_JOB_CONNECT));
  EXPECT_TRUE(LogContainsEndEvent(entries, 5,
                                  NetLogEventType::SOCKET_POOL_CONNECT_JOB));
}

TEST_F(ClientSocketPoolBaseTest, BasicSynchronous) {
  CreatePool(kDefaultMaxSockets, kDefaultMaxSocketsPerGroup);

  TestCompletionCallback callback;
  ClientSocketHandle handle;
  BoundTestNetLog log;
  TestLoadTimingInfoNotConnected(handle);

  EXPECT_EQ(OK, handle.Init("a", params_, DEFAULT_PRIORITY,
                            ClientSocketPool::RespectLimits::ENABLED,
                            callback.callback(), pool_.get(), log.bound()));
  EXPECT_TRUE(handle.is_initialized());
  EXPECT_TRUE(handle.socket());
  TestLoadTimingInfoConnectedNotReused(handle);

  handle.Reset();
  TestLoadTimingInfoNotConnected(handle);

  TestNetLogEntry::List entries;
  log.GetEntries(&entries);

  EXPECT_EQ(4u, entries.size());
  EXPECT_TRUE(LogContainsBeginEvent(entries, 0, NetLogEventType::SOCKET_POOL));
  EXPECT_TRUE(LogContainsEvent(
      entries, 1, NetLogEventType::SOCKET_POOL_BOUND_TO_CONNECT_JOB,
      NetLogEventPhase::NONE));
  EXPECT_TRUE(LogContainsEvent(entries, 2,
                               NetLogEventType::SOCKET_POOL_BOUND_TO_SOCKET,
                               NetLogEventPhase::NONE));
  EXPECT_TRUE(LogContainsEndEvent(entries, 3, NetLogEventType::SOCKET_POOL));
}

TEST_F(ClientSocketPoolBaseTest, InitConnectionFailure) {
  CreatePool(kDefaultMaxSockets, kDefaultMaxSocketsPerGroup);

  connect_job_factory_->set_job_type(TestConnectJob::kMockFailingJob);
  BoundTestNetLog log;

  ClientSocketHandle handle;
  TestCompletionCallback callback;
  // Set the additional error state members to ensure that they get cleared.
  handle.set_is_ssl_error(true);
  HttpResponseInfo info;
  info.headers = new HttpResponseHeaders(std::string());
  handle.set_ssl_error_response_info(info);
  EXPECT_EQ(ERR_CONNECTION_FAILED,
            handle.Init("a", params_, DEFAULT_PRIORITY,
                        ClientSocketPool::RespectLimits::ENABLED,
                        callback.callback(), pool_.get(), log.bound()));
  EXPECT_FALSE(handle.socket());
  EXPECT_FALSE(handle.is_ssl_error());
  EXPECT_TRUE(handle.ssl_error_response_info().headers.get() == NULL);
  TestLoadTimingInfoNotConnected(handle);

  TestNetLogEntry::List entries;
  log.GetEntries(&entries);

  EXPECT_EQ(3u, entries.size());
  EXPECT_TRUE(LogContainsBeginEvent(entries, 0, NetLogEventType::SOCKET_POOL));
  EXPECT_TRUE(LogContainsEvent(
      entries, 1, NetLogEventType::SOCKET_POOL_BOUND_TO_CONNECT_JOB,
      NetLogEventPhase::NONE));
  EXPECT_TRUE(LogContainsEndEvent(entries, 2, NetLogEventType::SOCKET_POOL));
}

TEST_F(ClientSocketPoolBaseTest, TotalLimit) {
  base::HistogramTester histograms;
  CreatePool(kDefaultMaxSockets, kDefaultMaxSocketsPerGroup);

  // TODO(eroman): Check that the NetLog contains this event.

  EXPECT_THAT(StartRequest("a", DEFAULT_PRIORITY), IsOk());
  EXPECT_THAT(StartRequest("b", DEFAULT_PRIORITY), IsOk());
  EXPECT_THAT(StartRequest("c", DEFAULT_PRIORITY), IsOk());
  EXPECT_THAT(StartRequest("d", DEFAULT_PRIORITY), IsOk());

  EXPECT_EQ(static_cast<int>(requests_size()),
            client_socket_factory_.allocation_count());
  EXPECT_EQ(requests_size() - kDefaultMaxSockets, completion_count());

  EXPECT_THAT(StartRequest("e", DEFAULT_PRIORITY), IsError(ERR_IO_PENDING));
  EXPECT_THAT(StartRequest("f", DEFAULT_PRIORITY), IsError(ERR_IO_PENDING));
  EXPECT_THAT(StartRequest("g", DEFAULT_PRIORITY), IsError(ERR_IO_PENDING));

  ReleaseAllConnections(ClientSocketPoolTest::NO_KEEP_ALIVE);

  EXPECT_THAT(histograms.GetAllSamples(kIdleSocketFateHistogram),
              testing::ElementsAre(
                  base::Bucket(/*IDLE_SOCKET_FATE_RELEASE_UNUSABLE=*/3, 7)));

  EXPECT_EQ(static_cast<int>(requests_size()),
            client_socket_factory_.allocation_count());
  EXPECT_EQ(requests_size() - kDefaultMaxSockets, completion_count());

  EXPECT_EQ(1, GetOrderOfRequest(1));
  EXPECT_EQ(2, GetOrderOfRequest(2));
  EXPECT_EQ(3, GetOrderOfRequest(3));
  EXPECT_EQ(4, GetOrderOfRequest(4));
  EXPECT_EQ(5, GetOrderOfRequest(5));
  EXPECT_EQ(6, GetOrderOfRequest(6));
  EXPECT_EQ(7, GetOrderOfRequest(7));

  // Make sure we test order of all requests made.
  EXPECT_EQ(ClientSocketPoolTest::kIndexOutOfBounds, GetOrderOfRequest(8));
}

TEST_F(ClientSocketPoolBaseTest, TotalLimitReachedNewGroup) {
  base::HistogramTester histograms;
  CreatePool(kDefaultMaxSockets, kDefaultMaxSocketsPerGroup);

  // TODO(eroman): Check that the NetLog contains this event.

  // Reach all limits: max total sockets, and max sockets per group.
  EXPECT_THAT(StartRequest("a", DEFAULT_PRIORITY), IsOk());
  EXPECT_THAT(StartRequest("a", DEFAULT_PRIORITY), IsOk());
  EXPECT_THAT(StartRequest("b", DEFAULT_PRIORITY), IsOk());
  EXPECT_THAT(StartRequest("b", DEFAULT_PRIORITY), IsOk());

  EXPECT_EQ(static_cast<int>(requests_size()),
            client_socket_factory_.allocation_count());
  EXPECT_EQ(requests_size() - kDefaultMaxSockets, completion_count());

  // Now create a new group and verify that we don't starve it.
  EXPECT_THAT(StartRequest("c", DEFAULT_PRIORITY), IsError(ERR_IO_PENDING));

  ReleaseAllConnections(ClientSocketPoolTest::NO_KEEP_ALIVE);
  EXPECT_THAT(histograms.GetAllSamples(kIdleSocketFateHistogram),
              testing::ElementsAre(
                  base::Bucket(/*IDLE_SOCKET_FATE_RELEASE_UNUSABLE=*/3, 5)));

  EXPECT_EQ(static_cast<int>(requests_size()),
            client_socket_factory_.allocation_count());
  EXPECT_EQ(requests_size() - kDefaultMaxSockets, completion_count());

  EXPECT_EQ(1, GetOrderOfRequest(1));
  EXPECT_EQ(2, GetOrderOfRequest(2));
  EXPECT_EQ(3, GetOrderOfRequest(3));
  EXPECT_EQ(4, GetOrderOfRequest(4));
  EXPECT_EQ(5, GetOrderOfRequest(5));

  // Make sure we test order of all requests made.
  EXPECT_EQ(ClientSocketPoolTest::kIndexOutOfBounds, GetOrderOfRequest(6));
}

TEST_F(ClientSocketPoolBaseTest, TotalLimitRespectsPriority) {
  base::HistogramTester histograms;
  CreatePool(kDefaultMaxSockets, kDefaultMaxSocketsPerGroup);

  EXPECT_THAT(StartRequest("b", LOWEST), IsOk());
  EXPECT_THAT(StartRequest("a", MEDIUM), IsOk());
  EXPECT_THAT(StartRequest("b", HIGHEST), IsOk());
  EXPECT_THAT(StartRequest("a", LOWEST), IsOk());

  EXPECT_EQ(static_cast<int>(requests_size()),
            client_socket_factory_.allocation_count());

  EXPECT_THAT(StartRequest("c", LOWEST), IsError(ERR_IO_PENDING));
  EXPECT_THAT(StartRequest("a", MEDIUM), IsError(ERR_IO_PENDING));
  EXPECT_THAT(StartRequest("b", HIGHEST), IsError(ERR_IO_PENDING));

  ReleaseAllConnections(ClientSocketPoolTest::NO_KEEP_ALIVE);
  EXPECT_THAT(histograms.GetAllSamples(kIdleSocketFateHistogram),
              testing::ElementsAre(
                  base::Bucket(/*IDLE_SOCKET_FATE_RELEASE_UNUSABLE=*/3, 7)));

  EXPECT_EQ(requests_size() - kDefaultMaxSockets, completion_count());

  // First 4 requests don't have to wait, and finish in order.
  EXPECT_EQ(1, GetOrderOfRequest(1));
  EXPECT_EQ(2, GetOrderOfRequest(2));
  EXPECT_EQ(3, GetOrderOfRequest(3));
  EXPECT_EQ(4, GetOrderOfRequest(4));

  // Request ("b", HIGHEST) has the highest priority, then ("a", MEDIUM),
  // and then ("c", LOWEST).
  EXPECT_EQ(7, GetOrderOfRequest(5));
  EXPECT_EQ(6, GetOrderOfRequest(6));
  EXPECT_EQ(5, GetOrderOfRequest(7));

  // Make sure we test order of all requests made.
  EXPECT_EQ(ClientSocketPoolTest::kIndexOutOfBounds, GetOrderOfRequest(9));
}

// Test reprioritizing a request before completion doesn't interfere with
// its completion.
TEST_F(ClientSocketPoolBaseTest, ReprioritizeOne) {
  CreatePool(kDefaultMaxSockets, 1);

  EXPECT_THAT(StartRequest("a", LOWEST), IsError(OK));
  EXPECT_THAT(StartRequest("a", MEDIUM), IsError(ERR_IO_PENDING));
  EXPECT_TRUE(request(0)->handle()->socket());
  EXPECT_FALSE(request(1)->handle()->socket());

  request(1)->handle()->SetPriority(MEDIUM);

  ReleaseOneConnection(ClientSocketPoolTest::NO_KEEP_ALIVE);

  EXPECT_TRUE(request(1)->handle()->socket());
}

// Reprioritize a request up past another one and make sure that changes the
// completion order.
TEST_F(ClientSocketPoolBaseTest, ReprioritizeUpReorder) {
  CreatePool(kDefaultMaxSockets, 1);

  EXPECT_THAT(StartRequest("a", LOWEST), IsError(OK));
  EXPECT_THAT(StartRequest("a", MEDIUM), IsError(ERR_IO_PENDING));
  EXPECT_THAT(StartRequest("a", LOWEST), IsError(ERR_IO_PENDING));
  EXPECT_TRUE(request(0)->handle()->socket());
  EXPECT_FALSE(request(1)->handle()->socket());
  EXPECT_FALSE(request(2)->handle()->socket());

  request(2)->handle()->SetPriority(HIGHEST);

  ReleaseAllConnections(ClientSocketPoolTest::NO_KEEP_ALIVE);

  EXPECT_EQ(1, GetOrderOfRequest(1));
  EXPECT_EQ(3, GetOrderOfRequest(2));
  EXPECT_EQ(2, GetOrderOfRequest(3));
}

// Reprioritize a request without changing relative priorities and check
// that the order doesn't change.
TEST_F(ClientSocketPoolBaseTest, ReprioritizeUpNoReorder) {
  CreatePool(kDefaultMaxSockets, 1);

  EXPECT_THAT(StartRequest("a", LOWEST), IsError(OK));
  EXPECT_THAT(StartRequest("a", MEDIUM), IsError(ERR_IO_PENDING));
  EXPECT_THAT(StartRequest("a", LOW), IsError(ERR_IO_PENDING));
  EXPECT_TRUE(request(0)->handle()->socket());
  EXPECT_FALSE(request(1)->handle()->socket());
  EXPECT_FALSE(request(2)->handle()->socket());

  request(2)->handle()->SetPriority(MEDIUM);

  ReleaseAllConnections(ClientSocketPoolTest::NO_KEEP_ALIVE);

  EXPECT_EQ(1, GetOrderOfRequest(1));
  EXPECT_EQ(2, GetOrderOfRequest(2));
  EXPECT_EQ(3, GetOrderOfRequest(3));
}

// Reprioritize a request past down another one and make sure that changes the
// completion order.
TEST_F(ClientSocketPoolBaseTest, ReprioritizeDownReorder) {
  CreatePool(kDefaultMaxSockets, 1);

  EXPECT_THAT(StartRequest("a", LOWEST), IsError(OK));
  EXPECT_THAT(StartRequest("a", HIGHEST), IsError(ERR_IO_PENDING));
  EXPECT_THAT(StartRequest("a", MEDIUM), IsError(ERR_IO_PENDING));
  EXPECT_TRUE(request(0)->handle()->socket());
  EXPECT_FALSE(request(1)->handle()->socket());
  EXPECT_FALSE(request(2)->handle()->socket());

  request(1)->handle()->SetPriority(LOW);

  ReleaseAllConnections(ClientSocketPoolTest::NO_KEEP_ALIVE);

  EXPECT_EQ(1, GetOrderOfRequest(1));
  EXPECT_EQ(3, GetOrderOfRequest(2));
  EXPECT_EQ(2, GetOrderOfRequest(3));
}

// Reprioritize a request to the same level as another and confirm it is
// put after the old request.
TEST_F(ClientSocketPoolBaseTest, ReprioritizeResetFIFO) {
  CreatePool(kDefaultMaxSockets, 1);

  EXPECT_THAT(StartRequest("a", LOWEST), IsError(OK));
  EXPECT_THAT(StartRequest("a", HIGHEST), IsError(ERR_IO_PENDING));
  EXPECT_THAT(StartRequest("a", MEDIUM), IsError(ERR_IO_PENDING));
  EXPECT_TRUE(request(0)->handle()->socket());
  EXPECT_FALSE(request(1)->handle()->socket());
  EXPECT_FALSE(request(2)->handle()->socket());

  request(1)->handle()->SetPriority(MEDIUM);

  ReleaseAllConnections(ClientSocketPoolTest::NO_KEEP_ALIVE);

  EXPECT_EQ(1, GetOrderOfRequest(1));
  EXPECT_EQ(3, GetOrderOfRequest(2));
  EXPECT_EQ(2, GetOrderOfRequest(3));
}

TEST_F(ClientSocketPoolBaseTest, TotalLimitRespectsGroupLimit) {
  base::HistogramTester histograms;
  CreatePool(kDefaultMaxSockets, kDefaultMaxSocketsPerGroup);

  EXPECT_THAT(StartRequest("a", LOWEST), IsOk());
  EXPECT_THAT(StartRequest("a", LOW), IsOk());
  EXPECT_THAT(StartRequest("b", HIGHEST), IsOk());
  EXPECT_THAT(StartRequest("b", MEDIUM), IsOk());

  EXPECT_EQ(static_cast<int>(requests_size()),
            client_socket_factory_.allocation_count());

  EXPECT_THAT(StartRequest("c", MEDIUM), IsError(ERR_IO_PENDING));
  EXPECT_THAT(StartRequest("a", LOW), IsError(ERR_IO_PENDING));
  EXPECT_THAT(StartRequest("b", HIGHEST), IsError(ERR_IO_PENDING));

  ReleaseAllConnections(ClientSocketPoolTest::NO_KEEP_ALIVE);
  EXPECT_THAT(histograms.GetAllSamples(kIdleSocketFateHistogram),
              testing::ElementsAre(
                  base::Bucket(/*IDLE_SOCKET_FATE_RELEASE_UNUSABLE=*/3, 7)));

  EXPECT_EQ(static_cast<int>(requests_size()),
            client_socket_factory_.allocation_count());
  EXPECT_EQ(requests_size() - kDefaultMaxSockets, completion_count());

  // First 4 requests don't have to wait, and finish in order.
  EXPECT_EQ(1, GetOrderOfRequest(1));
  EXPECT_EQ(2, GetOrderOfRequest(2));
  EXPECT_EQ(3, GetOrderOfRequest(3));
  EXPECT_EQ(4, GetOrderOfRequest(4));

  // Request ("b", 7) has the highest priority, but we can't make new socket for
  // group "b", because it has reached the per-group limit. Then we make
  // socket for ("c", 6), because it has higher priority than ("a", 4),
  // and we still can't make a socket for group "b".
  EXPECT_EQ(5, GetOrderOfRequest(5));
  EXPECT_EQ(6, GetOrderOfRequest(6));
  EXPECT_EQ(7, GetOrderOfRequest(7));

  // Make sure we test order of all requests made.
  EXPECT_EQ(ClientSocketPoolTest::kIndexOutOfBounds, GetOrderOfRequest(8));
}

// Make sure that we count connecting sockets against the total limit.
TEST_F(ClientSocketPoolBaseTest, TotalLimitCountsConnectingSockets) {
  base::HistogramTester histograms;
  CreatePool(kDefaultMaxSockets, kDefaultMaxSocketsPerGroup);

  EXPECT_THAT(StartRequest("a", DEFAULT_PRIORITY), IsOk());
  EXPECT_THAT(StartRequest("b", DEFAULT_PRIORITY), IsOk());
  EXPECT_THAT(StartRequest("c", DEFAULT_PRIORITY), IsOk());

  // Create one asynchronous request.
  connect_job_factory_->set_job_type(TestConnectJob::kMockPendingJob);
  EXPECT_THAT(StartRequest("d", DEFAULT_PRIORITY), IsError(ERR_IO_PENDING));

  // We post all of our delayed tasks with a 2ms delay. I.e. they don't
  // actually become pending until 2ms after they have been created. In order
  // to flush all tasks, we need to wait so that we know there are no
  // soon-to-be-pending tasks waiting.
  base::PlatformThread::Sleep(base::TimeDelta::FromMilliseconds(10));
  base::RunLoop().RunUntilIdle();

  // The next synchronous request should wait for its turn.
  connect_job_factory_->set_job_type(TestConnectJob::kMockJob);
  EXPECT_THAT(StartRequest("e", DEFAULT_PRIORITY), IsError(ERR_IO_PENDING));

  ReleaseAllConnections(ClientSocketPoolTest::NO_KEEP_ALIVE);
  EXPECT_THAT(histograms.GetAllSamples(kIdleSocketFateHistogram),
              testing::ElementsAre(
                  base::Bucket(/*IDLE_SOCKET_FATE_RELEASE_UNUSABLE=*/3, 5)));

  EXPECT_EQ(static_cast<int>(requests_size()),
            client_socket_factory_.allocation_count());

  EXPECT_EQ(1, GetOrderOfRequest(1));
  EXPECT_EQ(2, GetOrderOfRequest(2));
  EXPECT_EQ(3, GetOrderOfRequest(3));
  EXPECT_EQ(4, GetOrderOfRequest(4));
  EXPECT_EQ(5, GetOrderOfRequest(5));

  // Make sure we test order of all requests made.
  EXPECT_EQ(ClientSocketPoolTest::kIndexOutOfBounds, GetOrderOfRequest(6));
}

TEST_F(ClientSocketPoolBaseTest, CorrectlyCountStalledGroups) {
  base::HistogramTester histograms;
  CreatePool(kDefaultMaxSockets, kDefaultMaxSockets);
  connect_job_factory_->set_job_type(TestConnectJob::kMockJob);

  EXPECT_THAT(StartRequest("a", DEFAULT_PRIORITY), IsOk());
  EXPECT_THAT(StartRequest("a", DEFAULT_PRIORITY), IsOk());
  EXPECT_THAT(StartRequest("a", DEFAULT_PRIORITY), IsOk());
  EXPECT_THAT(StartRequest("a", DEFAULT_PRIORITY), IsOk());

  connect_job_factory_->set_job_type(TestConnectJob::kMockWaitingJob);

  EXPECT_EQ(kDefaultMaxSockets, client_socket_factory_.allocation_count());

  EXPECT_THAT(StartRequest("b", DEFAULT_PRIORITY), IsError(ERR_IO_PENDING));
  EXPECT_THAT(StartRequest("c", DEFAULT_PRIORITY), IsError(ERR_IO_PENDING));

  EXPECT_EQ(kDefaultMaxSockets, client_socket_factory_.allocation_count());

  EXPECT_TRUE(ReleaseOneConnection(ClientSocketPoolTest::KEEP_ALIVE));
  EXPECT_THAT(
      histograms.GetAllSamples(kIdleSocketFateHistogram),
      testing::ElementsAre(base::Bucket(/*IDLE_SOCKET_FATE_CLOSE_ONE=*/8, 1)));
  EXPECT_EQ(kDefaultMaxSockets + 1, client_socket_factory_.allocation_count());
  EXPECT_TRUE(ReleaseOneConnection(ClientSocketPoolTest::KEEP_ALIVE));
  EXPECT_THAT(
      histograms.GetAllSamples(kIdleSocketFateHistogram),
      testing::ElementsAre(base::Bucket(/*IDLE_SOCKET_FATE_CLOSE_ONE=*/8, 2)));
  EXPECT_EQ(kDefaultMaxSockets + 2, client_socket_factory_.allocation_count());
  EXPECT_TRUE(ReleaseOneConnection(ClientSocketPoolTest::KEEP_ALIVE));
  EXPECT_TRUE(ReleaseOneConnection(ClientSocketPoolTest::KEEP_ALIVE));
  EXPECT_EQ(kDefaultMaxSockets + 2, client_socket_factory_.allocation_count());
  EXPECT_THAT(
      histograms.GetAllSamples(kIdleSocketFateHistogram),
      testing::ElementsAre(base::Bucket(/*IDLE_SOCKET_FATE_CLOSE_ONE=*/8, 2)));
}

TEST_F(ClientSocketPoolBaseTest, StallAndThenCancelAndTriggerAvailableSocket) {
  CreatePool(kDefaultMaxSockets, kDefaultMaxSockets);
  connect_job_factory_->set_job_type(TestConnectJob::kMockPendingJob);

  ClientSocketHandle handle;
  TestCompletionCallback callback;
  EXPECT_EQ(ERR_IO_PENDING,
            handle.Init("a", params_, DEFAULT_PRIORITY,
                        ClientSocketPool::RespectLimits::ENABLED,
                        callback.callback(), pool_.get(), NetLogWithSource()));

  ClientSocketHandle handles[4];
  for (size_t i = 0; i < arraysize(handles); ++i) {
    TestCompletionCallback callback;
    EXPECT_EQ(
        ERR_IO_PENDING,
        handles[i].Init("b", params_, DEFAULT_PRIORITY,
                        ClientSocketPool::RespectLimits::ENABLED,
                        callback.callback(), pool_.get(), NetLogWithSource()));
  }

  // One will be stalled, cancel all the handles now.
  // This should hit the OnAvailableSocketSlot() code where we previously had
  // stalled groups, but no longer have any.
  for (size_t i = 0; i < arraysize(handles); ++i)
    handles[i].Reset();
}

TEST_F(ClientSocketPoolBaseTest, CancelStalledSocketAtSocketLimit) {
  CreatePool(kDefaultMaxSockets, kDefaultMaxSocketsPerGroup);
  connect_job_factory_->set_job_type(TestConnectJob::kMockJob);

  {
    ClientSocketHandle handles[kDefaultMaxSockets];
    TestCompletionCallback callbacks[kDefaultMaxSockets];
    for (int i = 0; i < kDefaultMaxSockets; ++i) {
      EXPECT_EQ(OK,
                handles[i].Init(base::IntToString(i), params_, DEFAULT_PRIORITY,
                                ClientSocketPool::RespectLimits::ENABLED,
                                callbacks[i].callback(), pool_.get(),
                                NetLogWithSource()));
    }

    // Force a stalled group.
    ClientSocketHandle stalled_handle;
    TestCompletionCallback callback;
    EXPECT_EQ(ERR_IO_PENDING,
              stalled_handle.Init("foo", params_, DEFAULT_PRIORITY,
                                  ClientSocketPool::RespectLimits::ENABLED,
                                  callback.callback(), pool_.get(),
                                  NetLogWithSource()));

    // Cancel the stalled request.
    stalled_handle.Reset();

    EXPECT_EQ(kDefaultMaxSockets, client_socket_factory_.allocation_count());
    EXPECT_EQ(0, pool_->IdleSocketCount());

    // Dropping out of scope will close all handles and return them to idle.
  }

  EXPECT_EQ(kDefaultMaxSockets, client_socket_factory_.allocation_count());
  EXPECT_EQ(kDefaultMaxSockets, pool_->IdleSocketCount());
}

TEST_F(ClientSocketPoolBaseTest, CancelPendingSocketAtSocketLimit) {
  CreatePool(kDefaultMaxSockets, kDefaultMaxSocketsPerGroup);
  connect_job_factory_->set_job_type(TestConnectJob::kMockWaitingJob);

  {
    ClientSocketHandle handles[kDefaultMaxSockets];
    for (int i = 0; i < kDefaultMaxSockets; ++i) {
      TestCompletionCallback callback;
      EXPECT_EQ(ERR_IO_PENDING,
                handles[i].Init(base::IntToString(i), params_, DEFAULT_PRIORITY,
                                ClientSocketPool::RespectLimits::ENABLED,
                                callback.callback(), pool_.get(),
                                NetLogWithSource()));
    }

    // Force a stalled group.
    connect_job_factory_->set_job_type(TestConnectJob::kMockPendingJob);
    ClientSocketHandle stalled_handle;
    TestCompletionCallback callback;
    EXPECT_EQ(ERR_IO_PENDING,
              stalled_handle.Init("foo", params_, DEFAULT_PRIORITY,
                                  ClientSocketPool::RespectLimits::ENABLED,
                                  callback.callback(), pool_.get(),
                                  NetLogWithSource()));

    // Since it is stalled, it should have no connect jobs.
    EXPECT_EQ(0, pool_->NumConnectJobsInGroup("foo"));
    EXPECT_EQ(0, pool_->NumUnassignedConnectJobsInGroup("foo"));

    // Cancel the stalled request.
    handles[0].Reset();

    // Now we should have a connect job.
    EXPECT_EQ(1, pool_->NumConnectJobsInGroup("foo"));
    EXPECT_EQ(0, pool_->NumUnassignedConnectJobsInGroup("foo"));

    // The stalled socket should connect.
    EXPECT_THAT(callback.WaitForResult(), IsOk());

    EXPECT_EQ(kDefaultMaxSockets + 1,
              client_socket_factory_.allocation_count());
    EXPECT_EQ(0, pool_->IdleSocketCount());
    EXPECT_EQ(0, pool_->NumConnectJobsInGroup("foo"));
    EXPECT_EQ(0, pool_->NumUnassignedConnectJobsInGroup("foo"));

    // Dropping out of scope will close all handles and return them to idle.
  }

  EXPECT_EQ(1, pool_->IdleSocketCount());
}

TEST_F(ClientSocketPoolBaseTest, WaitForStalledSocketAtSocketLimit) {
  CreatePool(kDefaultMaxSockets, kDefaultMaxSocketsPerGroup);
  connect_job_factory_->set_job_type(TestConnectJob::kMockJob);

  ClientSocketHandle stalled_handle;
  TestCompletionCallback callback;
  {
    EXPECT_FALSE(pool_->IsStalled());
    ClientSocketHandle handles[kDefaultMaxSockets];
    for (int i = 0; i < kDefaultMaxSockets; ++i) {
      TestCompletionCallback callback;
      EXPECT_EQ(OK, handles[i].Init(base::StringPrintf("Take 2: %d", i),
                                    params_, DEFAULT_PRIORITY,
                                    ClientSocketPool::RespectLimits::ENABLED,
                                    callback.callback(), pool_.get(),
                                    NetLogWithSource()));
    }

    EXPECT_EQ(kDefaultMaxSockets, client_socket_factory_.allocation_count());
    EXPECT_EQ(0, pool_->IdleSocketCount());
    EXPECT_FALSE(pool_->IsStalled());

    // Now we will hit the socket limit.
    EXPECT_EQ(ERR_IO_PENDING,
              stalled_handle.Init("foo", params_, DEFAULT_PRIORITY,
                                  ClientSocketPool::RespectLimits::ENABLED,
                                  callback.callback(), pool_.get(),
                                  NetLogWithSource()));
    EXPECT_TRUE(pool_->IsStalled());

    // Dropping out of scope will close all handles and return them to idle.
  }

  // But if we wait for it, the released idle sockets will be closed in
  // preference of the waiting request.
  EXPECT_THAT(callback.WaitForResult(), IsOk());

  EXPECT_EQ(kDefaultMaxSockets + 1, client_socket_factory_.allocation_count());
  EXPECT_EQ(3, pool_->IdleSocketCount());
}

// Regression test for http://crbug.com/40952.
TEST_F(ClientSocketPoolBaseTest, CloseIdleSocketAtSocketLimitDeleteGroup) {
  base::HistogramTester histograms;
  CreatePool(kDefaultMaxSockets, kDefaultMaxSocketsPerGroup);
  pool_->EnableConnectBackupJobs();
  connect_job_factory_->set_job_type(TestConnectJob::kMockJob);

  for (int i = 0; i < kDefaultMaxSockets; ++i) {
    ClientSocketHandle handle;
    TestCompletionCallback callback;
    EXPECT_EQ(
        OK, handle.Init(base::IntToString(i), params_, DEFAULT_PRIORITY,
                        ClientSocketPool::RespectLimits::ENABLED,
                        callback.callback(), pool_.get(), NetLogWithSource()));
  }

  // Flush all the DoReleaseSocket tasks.
  base::RunLoop().RunUntilIdle();

  // Stall a group.  Set a pending job so it'll trigger a backup job if we don't
  // reuse a socket.
  connect_job_factory_->set_job_type(TestConnectJob::kMockPendingJob);
  ClientSocketHandle handle;
  TestCompletionCallback callback;

  // "0" is special here, since it should be the first entry in the sorted map,
  // which is the one which we would close an idle socket for.  We shouldn't
  // close an idle socket though, since we should reuse the idle socket.
  EXPECT_EQ(OK,
            handle.Init("0", params_, DEFAULT_PRIORITY,
                        ClientSocketPool::RespectLimits::ENABLED,
                        callback.callback(), pool_.get(), NetLogWithSource()));

  EXPECT_THAT(histograms.GetAllSamples(kIdleSocketFateHistogram),
              testing::ElementsAre(
                  base::Bucket(/*IDLE_SOCKET_FATE_REUSE_UNUSED=*/1, 1)));
  EXPECT_EQ(kDefaultMaxSockets, client_socket_factory_.allocation_count());
  EXPECT_EQ(kDefaultMaxSockets - 1, pool_->IdleSocketCount());
}

TEST_F(ClientSocketPoolBaseTest, PendingRequests) {
  base::HistogramTester histograms;
  CreatePool(kDefaultMaxSockets, kDefaultMaxSocketsPerGroup);

  EXPECT_THAT(StartRequest("a", DEFAULT_PRIORITY), IsOk());
  EXPECT_THAT(StartRequest("a", DEFAULT_PRIORITY), IsOk());
  EXPECT_THAT(StartRequest("a", IDLE), IsError(ERR_IO_PENDING));
  EXPECT_THAT(StartRequest("a", LOWEST), IsError(ERR_IO_PENDING));
  EXPECT_THAT(StartRequest("a", MEDIUM), IsError(ERR_IO_PENDING));
  EXPECT_THAT(StartRequest("a", HIGHEST), IsError(ERR_IO_PENDING));
  EXPECT_THAT(StartRequest("a", LOW), IsError(ERR_IO_PENDING));
  EXPECT_THAT(StartRequest("a", LOWEST), IsError(ERR_IO_PENDING));

  ReleaseAllConnections(ClientSocketPoolTest::KEEP_ALIVE);
  // 2 sockets reused for last 6 requests.
  EXPECT_THAT(histograms.GetAllSamples(kIdleSocketFateHistogram),
              testing::ElementsAre(
                  base::Bucket(/*IDLE_SOCKET_FATE_REUSE_UNUSED=*/1, 6)));

  EXPECT_EQ(kDefaultMaxSocketsPerGroup,
            client_socket_factory_.allocation_count());
  EXPECT_EQ(requests_size() - kDefaultMaxSocketsPerGroup,
            completion_count());

  EXPECT_EQ(1, GetOrderOfRequest(1));
  EXPECT_EQ(2, GetOrderOfRequest(2));
  EXPECT_EQ(8, GetOrderOfRequest(3));
  EXPECT_EQ(6, GetOrderOfRequest(4));
  EXPECT_EQ(4, GetOrderOfRequest(5));
  EXPECT_EQ(3, GetOrderOfRequest(6));
  EXPECT_EQ(5, GetOrderOfRequest(7));
  EXPECT_EQ(7, GetOrderOfRequest(8));

  // Make sure we test order of all requests made.
  EXPECT_EQ(ClientSocketPoolTest::kIndexOutOfBounds, GetOrderOfRequest(9));
}

TEST_F(ClientSocketPoolBaseTest, PendingRequests_NoKeepAlive) {
  base::HistogramTester histograms;
  CreatePool(kDefaultMaxSockets, kDefaultMaxSocketsPerGroup);

  EXPECT_THAT(StartRequest("a", DEFAULT_PRIORITY), IsOk());
  EXPECT_THAT(StartRequest("a", DEFAULT_PRIORITY), IsOk());
  EXPECT_THAT(StartRequest("a", LOWEST), IsError(ERR_IO_PENDING));
  EXPECT_THAT(StartRequest("a", MEDIUM), IsError(ERR_IO_PENDING));
  EXPECT_THAT(StartRequest("a", HIGHEST), IsError(ERR_IO_PENDING));
  EXPECT_THAT(StartRequest("a", LOW), IsError(ERR_IO_PENDING));
  EXPECT_THAT(StartRequest("a", LOWEST), IsError(ERR_IO_PENDING));

  ReleaseAllConnections(ClientSocketPoolTest::NO_KEEP_ALIVE);

  for (size_t i = kDefaultMaxSocketsPerGroup; i < requests_size(); ++i)
    EXPECT_THAT(request(i)->WaitForResult(), IsOk());

  EXPECT_THAT(histograms.GetAllSamples(kIdleSocketFateHistogram),
              testing::ElementsAre(
                  base::Bucket(/*IDLE_SOCKET_FATE_RELEASE_UNUSABE=*/3, 7)));
  EXPECT_EQ(static_cast<int>(requests_size()),
            client_socket_factory_.allocation_count());
  EXPECT_EQ(requests_size() - kDefaultMaxSocketsPerGroup,
            completion_count());
}

// This test will start up a RequestSocket() and then immediately Cancel() it.
// The pending connect job will be cancelled and should not call back into
// ClientSocketPoolBase.
TEST_F(ClientSocketPoolBaseTest, CancelRequestClearGroup) {
  CreatePool(kDefaultMaxSockets, kDefaultMaxSocketsPerGroup);

  connect_job_factory_->set_job_type(TestConnectJob::kMockPendingJob);
  ClientSocketHandle handle;
  TestCompletionCallback callback;
  EXPECT_EQ(ERR_IO_PENDING,
            handle.Init("a", params_, DEFAULT_PRIORITY,
                        ClientSocketPool::RespectLimits::ENABLED,
                        callback.callback(), pool_.get(), NetLogWithSource()));
  handle.Reset();
}

TEST_F(ClientSocketPoolBaseTest, ConnectCancelConnect) {
  CreatePool(kDefaultMaxSockets, kDefaultMaxSocketsPerGroup);

  connect_job_factory_->set_job_type(TestConnectJob::kMockPendingJob);
  ClientSocketHandle handle;
  TestCompletionCallback callback;

  EXPECT_EQ(ERR_IO_PENDING,
            handle.Init("a", params_, DEFAULT_PRIORITY,
                        ClientSocketPool::RespectLimits::ENABLED,
                        callback.callback(), pool_.get(), NetLogWithSource()));

  handle.Reset();

  TestCompletionCallback callback2;
  EXPECT_EQ(ERR_IO_PENDING,
            handle.Init("a", params_, DEFAULT_PRIORITY,
                        ClientSocketPool::RespectLimits::ENABLED,
                        callback2.callback(), pool_.get(), NetLogWithSource()));

  EXPECT_THAT(callback2.WaitForResult(), IsOk());
  EXPECT_FALSE(callback.have_result());

  handle.Reset();
}

TEST_F(ClientSocketPoolBaseTest, CancelRequest) {
  base::HistogramTester histograms;
  CreatePool(kDefaultMaxSockets, kDefaultMaxSocketsPerGroup);

  EXPECT_THAT(StartRequest("a", DEFAULT_PRIORITY), IsOk());
  EXPECT_THAT(StartRequest("a", DEFAULT_PRIORITY), IsOk());
  EXPECT_THAT(StartRequest("a", LOWEST), IsError(ERR_IO_PENDING));
  EXPECT_THAT(StartRequest("a", MEDIUM), IsError(ERR_IO_PENDING));
  EXPECT_THAT(StartRequest("a", HIGHEST), IsError(ERR_IO_PENDING));
  EXPECT_THAT(StartRequest("a", LOW), IsError(ERR_IO_PENDING));
  EXPECT_THAT(StartRequest("a", LOWEST), IsError(ERR_IO_PENDING));

  // Cancel a request.
  size_t index_to_cancel = kDefaultMaxSocketsPerGroup + 2;
  EXPECT_FALSE((*requests())[index_to_cancel]->handle()->is_initialized());
  (*requests())[index_to_cancel]->handle()->Reset();

  ReleaseAllConnections(ClientSocketPoolTest::KEEP_ALIVE);
  // 2 sockets reused for 4 requests.
  EXPECT_THAT(histograms.GetAllSamples(kIdleSocketFateHistogram),
              testing::ElementsAre(
                  base::Bucket(/*IDLE_SOCKET_FATE_REUSE_UNUSED=*/1, 4)));

  EXPECT_EQ(kDefaultMaxSocketsPerGroup,
            client_socket_factory_.allocation_count());
  EXPECT_EQ(requests_size() - kDefaultMaxSocketsPerGroup - 1,
            completion_count());

  EXPECT_EQ(1, GetOrderOfRequest(1));
  EXPECT_EQ(2, GetOrderOfRequest(2));
  EXPECT_EQ(5, GetOrderOfRequest(3));
  EXPECT_EQ(3, GetOrderOfRequest(4));
  EXPECT_EQ(ClientSocketPoolTest::kRequestNotFound,
            GetOrderOfRequest(5));  // Canceled request.
  EXPECT_EQ(4, GetOrderOfRequest(6));
  EXPECT_EQ(6, GetOrderOfRequest(7));

  // Make sure we test order of all requests made.
  EXPECT_EQ(ClientSocketPoolTest::kIndexOutOfBounds, GetOrderOfRequest(8));
}

// Function to be used as a callback on socket request completion.  It first
// disconnects the successfully connected socket from the first request, and
// then reuses the ClientSocketHandle to request another socket.
//
// |nested_callback| is called with the result of the second socket request.
void RequestSocketOnComplete(ClientSocketHandle* handle,
                             TestClientSocketPool* pool,
                             TestConnectJobFactory* test_connect_job_factory,
                             TestConnectJob::JobType next_job_type,
                             const CompletionCallback& nested_callback,
                             int first_request_result) {
  EXPECT_THAT(first_request_result, IsOk());

  test_connect_job_factory->set_job_type(next_job_type);

  // Don't allow reuse of the socket.  Disconnect it and then release it.
  if (handle->socket())
    handle->socket()->Disconnect();
  handle->Reset();

  scoped_refptr<TestSocketParams> params(new TestSocketParams());
  TestCompletionCallback callback;
  int rv = handle->Init("a", params, LOWEST,
                        ClientSocketPool::RespectLimits::ENABLED,
                        nested_callback, pool, NetLogWithSource());
  if (rv != ERR_IO_PENDING) {
    DCHECK_EQ(TestConnectJob::kMockJob, next_job_type);
    nested_callback.Run(rv);
  } else {
    DCHECK_EQ(TestConnectJob::kMockPendingJob, next_job_type);
  }
}

// Tests the case where a second socket is requested in a completion callback,
// and the second socket connects asynchronously.  Reuses the same
// ClientSocketHandle for the second socket, after disconnecting the first.
TEST_F(ClientSocketPoolBaseTest, RequestPendingJobTwice) {
  CreatePool(kDefaultMaxSockets, kDefaultMaxSocketsPerGroup);

  connect_job_factory_->set_job_type(TestConnectJob::kMockPendingJob);
  ClientSocketHandle handle;
  TestCompletionCallback second_result_callback;
  int rv = handle.Init(
      "a", params_, DEFAULT_PRIORITY, ClientSocketPool::RespectLimits::ENABLED,
      base::Bind(&RequestSocketOnComplete, &handle, pool_.get(),
                 connect_job_factory_, TestConnectJob::kMockPendingJob,
                 second_result_callback.callback()),
      pool_.get(), NetLogWithSource());
  ASSERT_THAT(rv, IsError(ERR_IO_PENDING));

  EXPECT_THAT(second_result_callback.WaitForResult(), IsOk());
}

// Tests the case where a second socket is requested in a completion callback,
// and the second socket connects synchronously.  Reuses the same
// ClientSocketHandle for the second socket, after disconnecting the first.
TEST_F(ClientSocketPoolBaseTest, RequestPendingJobThenSynchronous) {
  CreatePool(kDefaultMaxSockets, kDefaultMaxSocketsPerGroup);

  connect_job_factory_->set_job_type(TestConnectJob::kMockPendingJob);
  ClientSocketHandle handle;
  TestCompletionCallback second_result_callback;
  int rv = handle.Init(
      "a", params_, DEFAULT_PRIORITY, ClientSocketPool::RespectLimits::ENABLED,
      base::Bind(&RequestSocketOnComplete, &handle, pool_.get(),
                 connect_job_factory_, TestConnectJob::kMockPendingJob,
                 second_result_callback.callback()),
      pool_.get(), NetLogWithSource());
  ASSERT_THAT(rv, IsError(ERR_IO_PENDING));

  EXPECT_THAT(second_result_callback.WaitForResult(), IsOk());
}

// Make sure that pending requests get serviced after active requests get
// cancelled.
TEST_F(ClientSocketPoolBaseTest, CancelActiveRequestWithPendingRequests) {
  CreatePool(kDefaultMaxSockets, kDefaultMaxSocketsPerGroup);

  connect_job_factory_->set_job_type(TestConnectJob::kMockPendingJob);

  EXPECT_THAT(StartRequest("a", DEFAULT_PRIORITY), IsError(ERR_IO_PENDING));
  EXPECT_THAT(StartRequest("a", DEFAULT_PRIORITY), IsError(ERR_IO_PENDING));
  EXPECT_THAT(StartRequest("a", DEFAULT_PRIORITY), IsError(ERR_IO_PENDING));
  EXPECT_THAT(StartRequest("a", DEFAULT_PRIORITY), IsError(ERR_IO_PENDING));
  EXPECT_THAT(StartRequest("a", DEFAULT_PRIORITY), IsError(ERR_IO_PENDING));
  EXPECT_THAT(StartRequest("a", DEFAULT_PRIORITY), IsError(ERR_IO_PENDING));
  EXPECT_THAT(StartRequest("a", DEFAULT_PRIORITY), IsError(ERR_IO_PENDING));

  // Now, kDefaultMaxSocketsPerGroup requests should be active.
  // Let's cancel them.
  for (int i = 0; i < kDefaultMaxSocketsPerGroup; ++i) {
    ASSERT_FALSE(request(i)->handle()->is_initialized());
    request(i)->handle()->Reset();
  }

  // Let's wait for the rest to complete now.
  for (size_t i = kDefaultMaxSocketsPerGroup; i < requests_size(); ++i) {
    EXPECT_THAT(request(i)->WaitForResult(), IsOk());
    request(i)->handle()->Reset();
  }

  EXPECT_EQ(requests_size() - kDefaultMaxSocketsPerGroup,
            completion_count());
}

// Make sure that pending requests get serviced after active requests fail.
TEST_F(ClientSocketPoolBaseTest, FailingActiveRequestWithPendingRequests) {
  const size_t kMaxSockets = 5;
  CreatePool(kMaxSockets, kDefaultMaxSocketsPerGroup);

  connect_job_factory_->set_job_type(TestConnectJob::kMockPendingFailingJob);

  const size_t kNumberOfRequests = 2 * kDefaultMaxSocketsPerGroup + 1;
  ASSERT_LE(kNumberOfRequests, kMaxSockets);  // Otherwise the test will hang.

  // Queue up all the requests
  for (size_t i = 0; i < kNumberOfRequests; ++i)
    EXPECT_THAT(StartRequest("a", DEFAULT_PRIORITY), IsError(ERR_IO_PENDING));

  for (size_t i = 0; i < kNumberOfRequests; ++i)
    EXPECT_THAT(request(i)->WaitForResult(), IsError(ERR_CONNECTION_FAILED));
}

// Make sure that pending requests that complete synchronously get serviced
// after active requests fail. See https://crbug.com/723748
TEST_F(ClientSocketPoolBaseTest, HandleMultipleSyncFailuresAfterAsyncFailure) {
  const size_t kNumberOfRequests = 10;
  const size_t kMaxSockets = 1;
  CreatePool(kMaxSockets, kMaxSockets);

  connect_job_factory_->set_job_type(TestConnectJob::kMockPendingFailingJob);

  EXPECT_THAT(StartRequest("a", DEFAULT_PRIORITY), IsError(ERR_IO_PENDING));

  connect_job_factory_->set_job_type(TestConnectJob::kMockFailingJob);

  // Queue up all the other requests
  for (size_t i = 1; i < kNumberOfRequests; ++i)
    EXPECT_THAT(StartRequest("a", DEFAULT_PRIORITY), IsError(ERR_IO_PENDING));

  // Make sure all requests fail, instead of hanging.
  for (size_t i = 0; i < kNumberOfRequests; ++i)
    EXPECT_THAT(request(i)->WaitForResult(), IsError(ERR_CONNECTION_FAILED));
}

TEST_F(ClientSocketPoolBaseTest, CancelActiveRequestThenRequestSocket) {
  CreatePool(kDefaultMaxSockets, kDefaultMaxSocketsPerGroup);

  connect_job_factory_->set_job_type(TestConnectJob::kMockPendingJob);

  ClientSocketHandle handle;
  TestCompletionCallback callback;
  int rv = handle.Init("a", params_, DEFAULT_PRIORITY,
                       ClientSocketPool::RespectLimits::ENABLED,
                       callback.callback(), pool_.get(), NetLogWithSource());
  EXPECT_THAT(rv, IsError(ERR_IO_PENDING));

  // Cancel the active request.
  handle.Reset();

  rv = handle.Init("a", params_, DEFAULT_PRIORITY,
                   ClientSocketPool::RespectLimits::ENABLED,
                   callback.callback(), pool_.get(), NetLogWithSource());
  EXPECT_THAT(rv, IsError(ERR_IO_PENDING));
  EXPECT_THAT(callback.WaitForResult(), IsOk());

  EXPECT_FALSE(handle.is_reused());
  TestLoadTimingInfoConnectedNotReused(handle);
  EXPECT_EQ(2, client_socket_factory_.allocation_count());
}

TEST_F(ClientSocketPoolBaseTest, CloseIdleSocketsForced) {
  base::HistogramTester histograms;
  CreatePool(kDefaultMaxSockets, kDefaultMaxSocketsPerGroup);
  ClientSocketHandle handle;
  TestCompletionCallback callback;
  BoundTestNetLog log;
  int rv = handle.Init("a", params_, LOWEST,
                       ClientSocketPool::RespectLimits::ENABLED,
                       callback.callback(), pool_.get(), log.bound());
  EXPECT_THAT(rv, IsOk());
  handle.Reset();
  EXPECT_EQ(1, pool_->IdleSocketCount());
  pool_->CloseIdleSockets();
  EXPECT_THAT(histograms.GetAllSamples(kIdleSocketFateHistogram),
              testing::ElementsAre(
                  base::Bucket(/*IDLE_SOCKET_FATE_CLEAN_UP_FORCED=*/4, 1)));
}

TEST_F(ClientSocketPoolBaseTest, CloseIdleSocketsInGroupForced) {
  base::HistogramTester histograms;
  CreatePool(kDefaultMaxSockets, kDefaultMaxSocketsPerGroup);
  TestCompletionCallback callback;
  BoundTestNetLog log;
  ClientSocketHandle handle1;
  int rv = handle1.Init("a", params_, LOWEST,
                        ClientSocketPool::RespectLimits::ENABLED,
                        callback.callback(), pool_.get(), log.bound());
  EXPECT_THAT(rv, IsOk());
  ClientSocketHandle handle2;
  rv = handle2.Init("a", params_, LOWEST,
                    ClientSocketPool::RespectLimits::ENABLED,
                    callback.callback(), pool_.get(), log.bound());
  ClientSocketHandle handle3;
  rv = handle3.Init("b", params_, LOWEST,
                    ClientSocketPool::RespectLimits::ENABLED,
                    callback.callback(), pool_.get(), log.bound());
  EXPECT_THAT(rv, IsOk());
  handle1.Reset();
  handle2.Reset();
  handle3.Reset();
  EXPECT_EQ(3, pool_->IdleSocketCount());
  pool_->CloseIdleSocketsInGroup("a");
  EXPECT_EQ(1, pool_->IdleSocketCount());
  EXPECT_THAT(histograms.GetAllSamples(kIdleSocketFateHistogram),
              testing::ElementsAre(
                  base::Bucket(/*IDLE_SOCKET_FATE_CLEAN_UP_FORCED=*/4, 2)));
}

TEST_F(ClientSocketPoolBaseTest, CleanUpUnusableIdleSockets) {
  base::HistogramTester histograms;
  CreatePool(kDefaultMaxSockets, kDefaultMaxSocketsPerGroup);
  ClientSocketHandle handle;
  TestCompletionCallback callback;
  BoundTestNetLog log;
  int rv = handle.Init("a", params_, LOWEST,
                       ClientSocketPool::RespectLimits::ENABLED,
                       callback.callback(), pool_.get(), log.bound());
  EXPECT_THAT(rv, IsOk());
  StreamSocket* socket = handle.socket();
  handle.Reset();
  EXPECT_EQ(1, pool_->IdleSocketCount());

  // Disconnect socket now to make the socket unusable.
  socket->Disconnect();
  ClientSocketHandle handle2;
  rv = handle2.Init("a", params_, LOWEST,
                    ClientSocketPool::RespectLimits::ENABLED,
                    callback.callback(), pool_.get(), log.bound());
  EXPECT_THAT(rv, IsOk());
  EXPECT_FALSE(handle2.is_reused());

  EXPECT_THAT(histograms.GetAllSamples(kIdleSocketFateHistogram),
              testing::ElementsAre(
                  base::Bucket(/*IDLE_SOCKET_FATE_CLEAN_UP_UNUSABLE=*/7, 1)));
}

// Regression test for http://crbug.com/17985.
TEST_F(ClientSocketPoolBaseTest, GroupWithPendingRequestsIsNotEmpty) {
  base::HistogramTester histograms;
  const int kMaxSockets = 3;
  const int kMaxSocketsPerGroup = 2;
  CreatePool(kMaxSockets, kMaxSocketsPerGroup);

  const RequestPriority kHighPriority = HIGHEST;

  EXPECT_THAT(StartRequest("a", DEFAULT_PRIORITY), IsOk());
  EXPECT_THAT(StartRequest("a", DEFAULT_PRIORITY), IsOk());

  // This is going to be a pending request in an otherwise empty group.
  EXPECT_THAT(StartRequest("a", DEFAULT_PRIORITY), IsError(ERR_IO_PENDING));

  // Reach the maximum socket limit.
  EXPECT_THAT(StartRequest("b", DEFAULT_PRIORITY), IsOk());

  // Create a stalled group with high priorities.
  EXPECT_THAT(StartRequest("c", kHighPriority), IsError(ERR_IO_PENDING));
  EXPECT_THAT(StartRequest("c", kHighPriority), IsError(ERR_IO_PENDING));

  // Release the first two sockets from "a".  Because this is a keepalive,
  // the first release will unblock the pending request for "a".  The
  // second release will unblock a request for "c", becaue it is the next
  // high priority socket.
  EXPECT_TRUE(ReleaseOneConnection(ClientSocketPoolTest::KEEP_ALIVE));
  EXPECT_THAT(histograms.GetAllSamples(kIdleSocketFateHistogram),
              testing::ElementsAre(
                  base::Bucket(/*IDLE_SOCKET_FATE_REUSE_UNUSED=*/1, 1)));
  EXPECT_TRUE(ReleaseOneConnection(ClientSocketPoolTest::KEEP_ALIVE));
  EXPECT_THAT(
      histograms.GetAllSamples(kIdleSocketFateHistogram),
      testing::ElementsAre(base::Bucket(/*IDLE_SOCKET_FATE_REUSE_UNUSED=*/1, 1),
                           base::Bucket(/*IDLE_SOCKET_FATE_CLOSE_ONE=*/8, 1)));

  // Closing idle sockets should not get us into trouble, but in the bug
  // we were hitting a CHECK here.
  EXPECT_EQ(0, pool_->IdleSocketCountInGroup("a"));
  pool_->CloseIdleSockets();

  // Run the released socket wakeups.
  base::RunLoop().RunUntilIdle();
  EXPECT_THAT(
      histograms.GetAllSamples(kIdleSocketFateHistogram),
      testing::ElementsAre(base::Bucket(/*IDLE_SOCKET_FATE_REUSE_UNUSED=*/1, 1),
                           base::Bucket(/*IDLE_SOCKET_FATE_CLOSE_ONE=*/8, 1)));
}

TEST_F(ClientSocketPoolBaseTest, BasicAsynchronous) {
  CreatePool(kDefaultMaxSockets, kDefaultMaxSocketsPerGroup);

  connect_job_factory_->set_job_type(TestConnectJob::kMockPendingJob);
  ClientSocketHandle handle;
  TestCompletionCallback callback;
  BoundTestNetLog log;
  int rv = handle.Init("a", params_, LOWEST,
                       ClientSocketPool::RespectLimits::ENABLED,
                       callback.callback(), pool_.get(), log.bound());
  EXPECT_THAT(rv, IsError(ERR_IO_PENDING));
  EXPECT_EQ(LOAD_STATE_CONNECTING, pool_->GetLoadState("a", &handle));
  TestLoadTimingInfoNotConnected(handle);

  EXPECT_THAT(callback.WaitForResult(), IsOk());
  EXPECT_TRUE(handle.is_initialized());
  EXPECT_TRUE(handle.socket());
  TestLoadTimingInfoConnectedNotReused(handle);

  handle.Reset();
  TestLoadTimingInfoNotConnected(handle);

  TestNetLogEntry::List entries;
  log.GetEntries(&entries);

  EXPECT_EQ(4u, entries.size());
  EXPECT_TRUE(LogContainsBeginEvent(entries, 0, NetLogEventType::SOCKET_POOL));
  EXPECT_TRUE(LogContainsEvent(
      entries, 1, NetLogEventType::SOCKET_POOL_BOUND_TO_CONNECT_JOB,
      NetLogEventPhase::NONE));
  EXPECT_TRUE(LogContainsEvent(entries, 2,
                               NetLogEventType::SOCKET_POOL_BOUND_TO_SOCKET,
                               NetLogEventPhase::NONE));
  EXPECT_TRUE(LogContainsEndEvent(entries, 3, NetLogEventType::SOCKET_POOL));
}

TEST_F(ClientSocketPoolBaseTest,
       InitConnectionAsynchronousFailure) {
  CreatePool(kDefaultMaxSockets, kDefaultMaxSocketsPerGroup);

  connect_job_factory_->set_job_type(TestConnectJob::kMockPendingFailingJob);
  ClientSocketHandle handle;
  TestCompletionCallback callback;
  BoundTestNetLog log;
  // Set the additional error state members to ensure that they get cleared.
  handle.set_is_ssl_error(true);
  HttpResponseInfo info;
  info.headers = new HttpResponseHeaders(std::string());
  handle.set_ssl_error_response_info(info);
  EXPECT_EQ(ERR_IO_PENDING,
            handle.Init("a", params_, DEFAULT_PRIORITY,
                        ClientSocketPool::RespectLimits::ENABLED,
                        callback.callback(), pool_.get(), log.bound()));
  EXPECT_EQ(LOAD_STATE_CONNECTING, pool_->GetLoadState("a", &handle));
  EXPECT_THAT(callback.WaitForResult(), IsError(ERR_CONNECTION_FAILED));
  EXPECT_FALSE(handle.is_ssl_error());
  EXPECT_TRUE(handle.ssl_error_response_info().headers.get() == NULL);

  TestNetLogEntry::List entries;
  log.GetEntries(&entries);

  EXPECT_EQ(3u, entries.size());
  EXPECT_TRUE(LogContainsBeginEvent(entries, 0, NetLogEventType::SOCKET_POOL));
  EXPECT_TRUE(LogContainsEvent(
      entries, 1, NetLogEventType::SOCKET_POOL_BOUND_TO_CONNECT_JOB,
      NetLogEventPhase::NONE));
  EXPECT_TRUE(LogContainsEndEvent(entries, 2, NetLogEventType::SOCKET_POOL));
}

// Check that an async ConnectJob failure does not result in creation of a new
// ConnectJob when there's another pending request also waiting on its own
// ConnectJob.  See http://crbug.com/463960.
TEST_F(ClientSocketPoolBaseTest, AsyncFailureWithPendingRequestWithJob) {
  CreatePool(2, 2);
  connect_job_factory_->set_job_type(TestConnectJob::kMockPendingFailingJob);

  EXPECT_THAT(StartRequest("a", DEFAULT_PRIORITY), IsError(ERR_IO_PENDING));
  EXPECT_THAT(StartRequest("a", DEFAULT_PRIORITY), IsError(ERR_IO_PENDING));

  EXPECT_THAT(request(0)->WaitForResult(), IsError(ERR_CONNECTION_FAILED));
  EXPECT_THAT(request(1)->WaitForResult(), IsError(ERR_CONNECTION_FAILED));

  EXPECT_EQ(2, client_socket_factory_.allocation_count());
}

TEST_F(ClientSocketPoolBaseTest, TwoRequestsCancelOne) {
  // TODO(eroman): Add back the log expectations! Removed them because the
  //               ordering is difficult, and some may fire during destructor.
  CreatePool(kDefaultMaxSockets, kDefaultMaxSocketsPerGroup);

  connect_job_factory_->set_job_type(TestConnectJob::kMockPendingJob);
  ClientSocketHandle handle;
  TestCompletionCallback callback;
  ClientSocketHandle handle2;
  TestCompletionCallback callback2;

  EXPECT_EQ(ERR_IO_PENDING,
            handle.Init("a", params_, DEFAULT_PRIORITY,
                        ClientSocketPool::RespectLimits::ENABLED,
                        callback.callback(), pool_.get(), NetLogWithSource()));
  BoundTestNetLog log2;
  EXPECT_EQ(
      ERR_IO_PENDING,
      handle2.Init("a", params_, DEFAULT_PRIORITY,
                   ClientSocketPool::RespectLimits::ENABLED,
                   callback2.callback(), pool_.get(), NetLogWithSource()));

  handle.Reset();


  // At this point, request 2 is just waiting for the connect job to finish.

  EXPECT_THAT(callback2.WaitForResult(), IsOk());
  handle2.Reset();

  // Now request 2 has actually finished.
  // TODO(eroman): Add back log expectations.
}

TEST_F(ClientSocketPoolBaseTest, CancelRequestLimitsJobs) {
  CreatePool(kDefaultMaxSockets, kDefaultMaxSocketsPerGroup);

  connect_job_factory_->set_job_type(TestConnectJob::kMockPendingJob);

  EXPECT_THAT(StartRequest("a", LOWEST), IsError(ERR_IO_PENDING));
  EXPECT_THAT(StartRequest("a", LOW), IsError(ERR_IO_PENDING));
  EXPECT_THAT(StartRequest("a", MEDIUM), IsError(ERR_IO_PENDING));
  EXPECT_THAT(StartRequest("a", HIGHEST), IsError(ERR_IO_PENDING));

  EXPECT_EQ(kDefaultMaxSocketsPerGroup, pool_->NumConnectJobsInGroup("a"));
  (*requests())[2]->handle()->Reset();
  (*requests())[3]->handle()->Reset();
  EXPECT_EQ(kDefaultMaxSocketsPerGroup, pool_->NumConnectJobsInGroup("a"));

  (*requests())[1]->handle()->Reset();
  EXPECT_EQ(kDefaultMaxSocketsPerGroup, pool_->NumConnectJobsInGroup("a"));

  (*requests())[0]->handle()->Reset();
  EXPECT_EQ(kDefaultMaxSocketsPerGroup, pool_->NumConnectJobsInGroup("a"));
}

// When requests and ConnectJobs are not coupled, the request will get serviced
// by whatever comes first.
TEST_F(ClientSocketPoolBaseTest, ReleaseSockets) {
  CreatePool(kDefaultMaxSockets, kDefaultMaxSocketsPerGroup);

  // Start job 1 (async OK)
  connect_job_factory_->set_job_type(TestConnectJob::kMockPendingJob);

  std::vector<TestSocketRequest*> request_order;
  size_t completion_count;  // unused
  TestSocketRequest req1(&request_order, &completion_count);
  int rv = req1.handle()->Init(
      "a", params_, DEFAULT_PRIORITY, ClientSocketPool::RespectLimits::ENABLED,
      req1.callback(), pool_.get(), NetLogWithSource());
  EXPECT_THAT(rv, IsError(ERR_IO_PENDING));
  EXPECT_THAT(req1.WaitForResult(), IsOk());

  // Job 1 finished OK.  Start job 2 (also async OK).  Request 3 is pending
  // without a job.
  connect_job_factory_->set_job_type(TestConnectJob::kMockWaitingJob);

  TestSocketRequest req2(&request_order, &completion_count);
  rv = req2.handle()->Init("a", params_, DEFAULT_PRIORITY,
                           ClientSocketPool::RespectLimits::ENABLED,
                           req2.callback(), pool_.get(), NetLogWithSource());
  EXPECT_THAT(rv, IsError(ERR_IO_PENDING));
  TestSocketRequest req3(&request_order, &completion_count);
  rv = req3.handle()->Init("a", params_, DEFAULT_PRIORITY,
                           ClientSocketPool::RespectLimits::ENABLED,
                           req3.callback(), pool_.get(), NetLogWithSource());
  EXPECT_THAT(rv, IsError(ERR_IO_PENDING));

  // Both Requests 2 and 3 are pending.  We release socket 1 which should
  // service request 2.  Request 3 should still be waiting.
  req1.handle()->Reset();
  // Run the released socket wakeups.
  base::RunLoop().RunUntilIdle();
  ASSERT_TRUE(req2.handle()->socket());
  EXPECT_THAT(req2.WaitForResult(), IsOk());
  EXPECT_FALSE(req3.handle()->socket());

  // Signal job 2, which should service request 3.

  client_socket_factory_.SignalJobs();
  EXPECT_THAT(req3.WaitForResult(), IsOk());

  ASSERT_EQ(3U, request_order.size());
  EXPECT_EQ(&req1, request_order[0]);
  EXPECT_EQ(&req2, request_order[1]);
  EXPECT_EQ(&req3, request_order[2]);
  EXPECT_EQ(0, pool_->IdleSocketCountInGroup("a"));
}

// The requests are not coupled to the jobs.  So, the requests should finish in
// their priority / insertion order.
TEST_F(ClientSocketPoolBaseTest, PendingJobCompletionOrder) {
  CreatePool(kDefaultMaxSockets, kDefaultMaxSocketsPerGroup);
  // First two jobs are async.
  connect_job_factory_->set_job_type(TestConnectJob::kMockPendingFailingJob);

  std::vector<TestSocketRequest*> request_order;
  size_t completion_count;  // unused
  TestSocketRequest req1(&request_order, &completion_count);
  int rv = req1.handle()->Init(
      "a", params_, DEFAULT_PRIORITY, ClientSocketPool::RespectLimits::ENABLED,
      req1.callback(), pool_.get(), NetLogWithSource());
  EXPECT_THAT(rv, IsError(ERR_IO_PENDING));

  TestSocketRequest req2(&request_order, &completion_count);
  rv = req2.handle()->Init("a", params_, DEFAULT_PRIORITY,
                           ClientSocketPool::RespectLimits::ENABLED,
                           req2.callback(), pool_.get(), NetLogWithSource());
  EXPECT_THAT(rv, IsError(ERR_IO_PENDING));

  // The pending job is sync.
  connect_job_factory_->set_job_type(TestConnectJob::kMockJob);

  TestSocketRequest req3(&request_order, &completion_count);
  rv = req3.handle()->Init("a", params_, DEFAULT_PRIORITY,
                           ClientSocketPool::RespectLimits::ENABLED,
                           req3.callback(), pool_.get(), NetLogWithSource());
  EXPECT_THAT(rv, IsError(ERR_IO_PENDING));

  EXPECT_THAT(req1.WaitForResult(), IsError(ERR_CONNECTION_FAILED));
  EXPECT_THAT(req2.WaitForResult(), IsOk());
  EXPECT_THAT(req3.WaitForResult(), IsError(ERR_CONNECTION_FAILED));

  ASSERT_EQ(3U, request_order.size());
  EXPECT_EQ(&req1, request_order[0]);
  EXPECT_EQ(&req2, request_order[1]);
  EXPECT_EQ(&req3, request_order[2]);
}

// Test GetLoadState in the case there's only one socket request.
TEST_F(ClientSocketPoolBaseTest, LoadStateOneRequest) {
  CreatePool(kDefaultMaxSockets, kDefaultMaxSocketsPerGroup);
  connect_job_factory_->set_job_type(TestConnectJob::kMockWaitingJob);

  ClientSocketHandle handle;
  TestCompletionCallback callback;
  int rv = handle.Init("a", params_, DEFAULT_PRIORITY,
                       ClientSocketPool::RespectLimits::ENABLED,
                       callback.callback(), pool_.get(), NetLogWithSource());
  EXPECT_THAT(rv, IsError(ERR_IO_PENDING));
  EXPECT_EQ(LOAD_STATE_CONNECTING, handle.GetLoadState());

  client_socket_factory_.SetJobLoadState(0, LOAD_STATE_SSL_HANDSHAKE);
  EXPECT_EQ(LOAD_STATE_SSL_HANDSHAKE, handle.GetLoadState());

  // No point in completing the connection, since ClientSocketHandles only
  // expect the LoadState to be checked while connecting.
}

// Test GetLoadState in the case there are two socket requests.
// Only the first connection in the pool should affect the pool's load status.
TEST_F(ClientSocketPoolBaseTest, LoadStateTwoRequests) {
  CreatePool(2, 2);
  connect_job_factory_->set_job_type(TestConnectJob::kMockWaitingJob);

  ClientSocketHandle handle;
  TestCompletionCallback callback;
  int rv = handle.Init("a", params_, DEFAULT_PRIORITY,
                       ClientSocketPool::RespectLimits::ENABLED,
                       callback.callback(), pool_.get(), NetLogWithSource());
  EXPECT_THAT(rv, IsError(ERR_IO_PENDING));
  client_socket_factory_.SetJobLoadState(0, LOAD_STATE_RESOLVING_HOST);

  ClientSocketHandle handle2;
  TestCompletionCallback callback2;
  rv = handle2.Init("a", params_, DEFAULT_PRIORITY,
                    ClientSocketPool::RespectLimits::ENABLED,
                    callback2.callback(), pool_.get(), NetLogWithSource());
  EXPECT_THAT(rv, IsError(ERR_IO_PENDING));
  client_socket_factory_.SetJobLoadState(1, LOAD_STATE_RESOLVING_HOST);

  // Check that both handles report the state of the first job.
  EXPECT_EQ(LOAD_STATE_RESOLVING_HOST, handle.GetLoadState());
  EXPECT_EQ(LOAD_STATE_RESOLVING_HOST, handle2.GetLoadState());

  client_socket_factory_.SetJobLoadState(0, LOAD_STATE_CONNECTING);

  // Check that both handles change to LOAD_STATE_CONNECTING.
  EXPECT_EQ(LOAD_STATE_CONNECTING, handle.GetLoadState());
  EXPECT_EQ(LOAD_STATE_CONNECTING, handle2.GetLoadState());
}

// Test that the second connection request does not affect the pool's load
// status.
TEST_F(ClientSocketPoolBaseTest, LoadStateTwoRequestsChangeSecondRequestState) {
  CreatePool(2, 2);
  connect_job_factory_->set_job_type(TestConnectJob::kMockWaitingJob);

  ClientSocketHandle handle;
  TestCompletionCallback callback;
  int rv = handle.Init("a", params_, DEFAULT_PRIORITY,
                       ClientSocketPool::RespectLimits::ENABLED,
                       callback.callback(), pool_.get(), NetLogWithSource());
  EXPECT_THAT(rv, IsError(ERR_IO_PENDING));

  ClientSocketHandle handle2;
  TestCompletionCallback callback2;
  rv = handle2.Init("a", params_, DEFAULT_PRIORITY,
                    ClientSocketPool::RespectLimits::ENABLED,
                    callback2.callback(), pool_.get(), NetLogWithSource());
  EXPECT_THAT(rv, IsError(ERR_IO_PENDING));
  client_socket_factory_.SetJobLoadState(1, LOAD_STATE_RESOLVING_HOST);

  EXPECT_EQ(LOAD_STATE_CONNECTING, handle.GetLoadState());
  EXPECT_EQ(LOAD_STATE_CONNECTING, handle2.GetLoadState());

  // First job connects and the first request gets the socket.  The
  // second handle switches to the state of the remaining ConnectJob.
  client_socket_factory_.SignalJob(0);
  EXPECT_THAT(callback.WaitForResult(), IsOk());
  EXPECT_EQ(LOAD_STATE_RESOLVING_HOST, handle2.GetLoadState());
}

// Test GetLoadState in the case the per-group limit is reached.
TEST_F(ClientSocketPoolBaseTest, LoadStateGroupLimit) {
  CreatePool(2, 1);
  connect_job_factory_->set_job_type(TestConnectJob::kMockWaitingJob);

  ClientSocketHandle handle;
  TestCompletionCallback callback;
  int rv = handle.Init("a", params_, MEDIUM,
                       ClientSocketPool::RespectLimits::ENABLED,
                       callback.callback(), pool_.get(), NetLogWithSource());
  EXPECT_THAT(rv, IsError(ERR_IO_PENDING));
  EXPECT_EQ(LOAD_STATE_CONNECTING, handle.GetLoadState());

  // Request another socket from the same pool, buth with a higher priority.
  // The first request should now be stalled at the socket group limit.
  ClientSocketHandle handle2;
  TestCompletionCallback callback2;
  rv = handle2.Init("a", params_, HIGHEST,
                    ClientSocketPool::RespectLimits::ENABLED,
                    callback2.callback(), pool_.get(), NetLogWithSource());
  EXPECT_THAT(rv, IsError(ERR_IO_PENDING));
  EXPECT_EQ(LOAD_STATE_WAITING_FOR_AVAILABLE_SOCKET, handle.GetLoadState());
  EXPECT_EQ(LOAD_STATE_CONNECTING, handle2.GetLoadState());

  // The first handle should remain stalled as the other socket goes through
  // the connect process.

  client_socket_factory_.SetJobLoadState(0, LOAD_STATE_SSL_HANDSHAKE);
  EXPECT_EQ(LOAD_STATE_WAITING_FOR_AVAILABLE_SOCKET, handle.GetLoadState());
  EXPECT_EQ(LOAD_STATE_SSL_HANDSHAKE, handle2.GetLoadState());

  client_socket_factory_.SignalJob(0);
  EXPECT_THAT(callback2.WaitForResult(), IsOk());
  EXPECT_EQ(LOAD_STATE_WAITING_FOR_AVAILABLE_SOCKET, handle.GetLoadState());

  // Closing the second socket should cause the stalled handle to finally get a
  // ConnectJob.
  handle2.socket()->Disconnect();
  handle2.Reset();
  EXPECT_EQ(LOAD_STATE_CONNECTING, handle.GetLoadState());
}

// Test GetLoadState in the case the per-pool limit is reached.
TEST_F(ClientSocketPoolBaseTest, LoadStatePoolLimit) {
  CreatePool(2, 2);
  connect_job_factory_->set_job_type(TestConnectJob::kMockWaitingJob);

  ClientSocketHandle handle;
  TestCompletionCallback callback;
  int rv = handle.Init("a", params_, DEFAULT_PRIORITY,
                       ClientSocketPool::RespectLimits::ENABLED,
                       callback.callback(), pool_.get(), NetLogWithSource());
  EXPECT_THAT(rv, IsError(ERR_IO_PENDING));

  // Request for socket from another pool.
  ClientSocketHandle handle2;
  TestCompletionCallback callback2;
  rv = handle2.Init("b", params_, DEFAULT_PRIORITY,
                    ClientSocketPool::RespectLimits::ENABLED,
                    callback2.callback(), pool_.get(), NetLogWithSource());
  EXPECT_THAT(rv, IsError(ERR_IO_PENDING));

  // Request another socket from the first pool.  Request should stall at the
  // socket pool limit.
  ClientSocketHandle handle3;
  TestCompletionCallback callback3;
  rv = handle3.Init("a", params_, DEFAULT_PRIORITY,
                    ClientSocketPool::RespectLimits::ENABLED,
                    callback2.callback(), pool_.get(), NetLogWithSource());
  EXPECT_THAT(rv, IsError(ERR_IO_PENDING));

  // The third handle should remain stalled as the other sockets in its group
  // goes through the connect process.

  EXPECT_EQ(LOAD_STATE_CONNECTING, handle.GetLoadState());
  EXPECT_EQ(LOAD_STATE_WAITING_FOR_STALLED_SOCKET_POOL, handle3.GetLoadState());

  client_socket_factory_.SetJobLoadState(0, LOAD_STATE_SSL_HANDSHAKE);
  EXPECT_EQ(LOAD_STATE_SSL_HANDSHAKE, handle.GetLoadState());
  EXPECT_EQ(LOAD_STATE_WAITING_FOR_STALLED_SOCKET_POOL, handle3.GetLoadState());

  client_socket_factory_.SignalJob(0);
  EXPECT_THAT(callback.WaitForResult(), IsOk());
  EXPECT_EQ(LOAD_STATE_WAITING_FOR_STALLED_SOCKET_POOL, handle3.GetLoadState());

  // Closing a socket should allow the stalled handle to finally get a new
  // ConnectJob.
  handle.socket()->Disconnect();
  handle.Reset();
  EXPECT_EQ(LOAD_STATE_CONNECTING, handle3.GetLoadState());
}

TEST_F(ClientSocketPoolBaseTest, Recoverable) {
  CreatePool(kDefaultMaxSockets, kDefaultMaxSocketsPerGroup);
  connect_job_factory_->set_job_type(TestConnectJob::kMockRecoverableJob);

  ClientSocketHandle handle;
  TestCompletionCallback callback;
  EXPECT_EQ(ERR_PROXY_AUTH_REQUESTED,
            handle.Init("a", params_, DEFAULT_PRIORITY,
                        ClientSocketPool::RespectLimits::ENABLED,
                        callback.callback(), pool_.get(), NetLogWithSource()));
  EXPECT_TRUE(handle.is_initialized());
  EXPECT_TRUE(handle.socket());
}

TEST_F(ClientSocketPoolBaseTest, AsyncRecoverable) {
  CreatePool(kDefaultMaxSockets, kDefaultMaxSocketsPerGroup);

  connect_job_factory_->set_job_type(
      TestConnectJob::kMockPendingRecoverableJob);
  ClientSocketHandle handle;
  TestCompletionCallback callback;
  EXPECT_EQ(ERR_IO_PENDING,
            handle.Init("a", params_, DEFAULT_PRIORITY,
                        ClientSocketPool::RespectLimits::ENABLED,
                        callback.callback(), pool_.get(), NetLogWithSource()));
  EXPECT_EQ(LOAD_STATE_CONNECTING, pool_->GetLoadState("a", &handle));
  EXPECT_THAT(callback.WaitForResult(), IsError(ERR_PROXY_AUTH_REQUESTED));
  EXPECT_TRUE(handle.is_initialized());
  EXPECT_TRUE(handle.socket());
}

TEST_F(ClientSocketPoolBaseTest, AdditionalErrorStateSynchronous) {
  CreatePool(kDefaultMaxSockets, kDefaultMaxSocketsPerGroup);
  connect_job_factory_->set_job_type(
      TestConnectJob::kMockAdditionalErrorStateJob);

  ClientSocketHandle handle;
  TestCompletionCallback callback;
  EXPECT_EQ(ERR_CONNECTION_FAILED,
            handle.Init("a", params_, DEFAULT_PRIORITY,
                        ClientSocketPool::RespectLimits::ENABLED,
                        callback.callback(), pool_.get(), NetLogWithSource()));
  EXPECT_FALSE(handle.is_initialized());
  EXPECT_FALSE(handle.socket());
  EXPECT_TRUE(handle.is_ssl_error());
  EXPECT_FALSE(handle.ssl_error_response_info().headers.get() == NULL);
}

TEST_F(ClientSocketPoolBaseTest, AdditionalErrorStateAsynchronous) {
  CreatePool(kDefaultMaxSockets, kDefaultMaxSocketsPerGroup);

  connect_job_factory_->set_job_type(
      TestConnectJob::kMockPendingAdditionalErrorStateJob);
  ClientSocketHandle handle;
  TestCompletionCallback callback;
  EXPECT_EQ(ERR_IO_PENDING,
            handle.Init("a", params_, DEFAULT_PRIORITY,
                        ClientSocketPool::RespectLimits::ENABLED,
                        callback.callback(), pool_.get(), NetLogWithSource()));
  EXPECT_EQ(LOAD_STATE_CONNECTING, pool_->GetLoadState("a", &handle));
  EXPECT_THAT(callback.WaitForResult(), IsError(ERR_CONNECTION_FAILED));
  EXPECT_FALSE(handle.is_initialized());
  EXPECT_FALSE(handle.socket());
  EXPECT_TRUE(handle.is_ssl_error());
  EXPECT_FALSE(handle.ssl_error_response_info().headers.get() == NULL);
}

// Make sure we can reuse sockets.
TEST_F(ClientSocketPoolBaseTest, CleanupTimedOutIdleSocketsReuse) {
  base::HistogramTester histograms;
  CreatePoolWithIdleTimeouts(
      kDefaultMaxSockets, kDefaultMaxSocketsPerGroup,
      base::TimeDelta(),  // Time out unused sockets immediately.
      base::TimeDelta::FromDays(1));  // Don't time out used sockets.

  connect_job_factory_->set_job_type(TestConnectJob::kMockPendingJob);

  ClientSocketHandle handle;
  TestCompletionCallback callback;
  int rv = handle.Init("a", params_, LOWEST,
                       ClientSocketPool::RespectLimits::ENABLED,
                       callback.callback(), pool_.get(), NetLogWithSource());
  ASSERT_THAT(rv, IsError(ERR_IO_PENDING));
  EXPECT_EQ(LOAD_STATE_CONNECTING, pool_->GetLoadState("a", &handle));
  ASSERT_THAT(callback.WaitForResult(), IsOk());

  // Use and release the socket.
  EXPECT_EQ(1, handle.socket()->Write(NULL, 1, CompletionCallback()));
  TestLoadTimingInfoConnectedNotReused(handle);
  handle.Reset();

  // Should now have one idle socket.
  ASSERT_EQ(1, pool_->IdleSocketCount());

  // Request a new socket. This should reuse the old socket and complete
  // synchronously.
  BoundTestNetLog log;
  rv = handle.Init("a", params_, LOWEST,
                   ClientSocketPool::RespectLimits::ENABLED,
                   CompletionCallback(), pool_.get(), log.bound());
  ASSERT_THAT(rv, IsOk());
  EXPECT_TRUE(handle.is_reused());
  TestLoadTimingInfoConnectedReused(handle);

  ASSERT_TRUE(pool_->HasGroup("a"));
  EXPECT_EQ(0, pool_->IdleSocketCountInGroup("a"));
  EXPECT_EQ(1, pool_->NumActiveSocketsInGroup("a"));
  EXPECT_THAT(histograms.GetAllSamples(kIdleSocketFateHistogram),
              testing::ElementsAre(
                  base::Bucket(/*IDLE_SOCKET_FATE_REUSE_REUSED=*/0, 1)));

  TestNetLogEntry::List entries;
  log.GetEntries(&entries);
  EXPECT_TRUE(LogContainsEntryWithType(
      entries, 1, NetLogEventType::SOCKET_POOL_REUSED_AN_EXISTING_SOCKET));
}

#if defined(OS_IOS)
// TODO(droger): Enable this test (crbug.com/512595).
#define MAYBE_CleanupTimedOutIdleSocketsNoReuse \
  DISABLED_CleanupTimedOutIdleSocketsNoReuse
#else
#define MAYBE_CleanupTimedOutIdleSocketsNoReuse \
  CleanupTimedOutIdleSocketsNoReuse
#endif
// Make sure we cleanup old unused sockets.
TEST_F(ClientSocketPoolBaseTest, MAYBE_CleanupTimedOutIdleSocketsNoReuse) {
  base::HistogramTester histograms;
  CreatePoolWithIdleTimeouts(
      kDefaultMaxSockets, kDefaultMaxSocketsPerGroup,
      base::TimeDelta(),  // Time out unused sockets immediately
      base::TimeDelta());  // Time out used sockets immediately

  connect_job_factory_->set_job_type(TestConnectJob::kMockPendingJob);

  // Startup two mock pending connect jobs, which will sit in the MessageLoop.

  ClientSocketHandle handle;
  TestCompletionCallback callback;
  int rv = handle.Init("a", params_, LOWEST,
                       ClientSocketPool::RespectLimits::ENABLED,
                       callback.callback(), pool_.get(), NetLogWithSource());
  ASSERT_THAT(rv, IsError(ERR_IO_PENDING));
  EXPECT_EQ(LOAD_STATE_CONNECTING, pool_->GetLoadState("a", &handle));

  ClientSocketHandle handle2;
  TestCompletionCallback callback2;
  rv = handle2.Init("a", params_, LOWEST,
                    ClientSocketPool::RespectLimits::ENABLED,
                    callback2.callback(), pool_.get(), NetLogWithSource());
  ASSERT_THAT(rv, IsError(ERR_IO_PENDING));
  EXPECT_EQ(LOAD_STATE_CONNECTING, pool_->GetLoadState("a", &handle2));

  // Cancel one of the requests.  Wait for the other, which will get the first
  // job.  Release the socket.  Run the loop again to make sure the second
  // socket is sitting idle and the first one is released (since ReleaseSocket()
  // just posts a DoReleaseSocket() task).

  handle.Reset();
  ASSERT_THAT(callback2.WaitForResult(), IsOk());
  // Use the socket.
  EXPECT_EQ(1, handle2.socket()->Write(NULL, 1, CompletionCallback()));
  handle2.Reset();

  // We post all of our delayed tasks with a 2ms delay. I.e. they don't
  // actually become pending until 2ms after they have been created. In order
  // to flush all tasks, we need to wait so that we know there are no
  // soon-to-be-pending tasks waiting.
  base::PlatformThread::Sleep(base::TimeDelta::FromMilliseconds(10));
  base::RunLoop().RunUntilIdle();

  // Both sockets should now be idle.
  ASSERT_EQ(2, pool_->IdleSocketCount());

  // Request a new socket. This should cleanup the unused and timed out ones.
  // A new socket will be created rather than reusing the idle one.
  BoundTestNetLog log;
  TestCompletionCallback callback3;
  rv = handle.Init("a", params_, LOWEST,
                   ClientSocketPool::RespectLimits::ENABLED,
                   callback3.callback(), pool_.get(), log.bound());
  ASSERT_THAT(rv, IsError(ERR_IO_PENDING));
  ASSERT_THAT(callback3.WaitForResult(), IsOk());
  EXPECT_FALSE(handle.is_reused());

  EXPECT_THAT(
      histograms.GetAllSamples(kIdleSocketFateHistogram),
      testing::ElementsAre(
          base::Bucket(/*IDLE_SOCKET_FATE_CLEAN_UP_TIMED_OUT_REUSED=*/5, 1),
          base::Bucket(/*IDLE_SOCKET_FATE_CLEAN_UP_TIMED_OUT_UNUSED=*/6, 1)));

  // Make sure the idle socket is closed.
  ASSERT_TRUE(pool_->HasGroup("a"));
  EXPECT_EQ(0, pool_->IdleSocketCountInGroup("a"));
  EXPECT_EQ(1, pool_->NumActiveSocketsInGroup("a"));

  TestNetLogEntry::List entries;
  log.GetEntries(&entries);
  EXPECT_FALSE(LogContainsEntryWithType(
      entries, 1, NetLogEventType::SOCKET_POOL_REUSED_AN_EXISTING_SOCKET));
}

// Make sure that we process all pending requests even when we're stalling
// because of multiple releasing disconnected sockets.
TEST_F(ClientSocketPoolBaseTest, MultipleReleasingDisconnectedSockets) {
  CreatePoolWithIdleTimeouts(
      kDefaultMaxSockets, kDefaultMaxSocketsPerGroup,
      base::TimeDelta(),  // Time out unused sockets immediately.
      base::TimeDelta::FromDays(1));  // Don't time out used sockets.

  connect_job_factory_->set_job_type(TestConnectJob::kMockJob);

  // Startup 4 connect jobs.  Two of them will be pending.

  ClientSocketHandle handle;
  TestCompletionCallback callback;
  int rv = handle.Init("a", params_, LOWEST,
                       ClientSocketPool::RespectLimits::ENABLED,
                       callback.callback(), pool_.get(), NetLogWithSource());
  EXPECT_THAT(rv, IsOk());

  ClientSocketHandle handle2;
  TestCompletionCallback callback2;
  rv = handle2.Init("a", params_, LOWEST,
                    ClientSocketPool::RespectLimits::ENABLED,
                    callback2.callback(), pool_.get(), NetLogWithSource());
  EXPECT_THAT(rv, IsOk());

  ClientSocketHandle handle3;
  TestCompletionCallback callback3;
  rv = handle3.Init("a", params_, LOWEST,
                    ClientSocketPool::RespectLimits::ENABLED,
                    callback3.callback(), pool_.get(), NetLogWithSource());
  EXPECT_THAT(rv, IsError(ERR_IO_PENDING));

  ClientSocketHandle handle4;
  TestCompletionCallback callback4;
  rv = handle4.Init("a", params_, LOWEST,
                    ClientSocketPool::RespectLimits::ENABLED,
                    callback4.callback(), pool_.get(), NetLogWithSource());
  EXPECT_THAT(rv, IsError(ERR_IO_PENDING));

  // Release two disconnected sockets.

  handle.socket()->Disconnect();
  handle.Reset();
  handle2.socket()->Disconnect();
  handle2.Reset();

  EXPECT_THAT(callback3.WaitForResult(), IsOk());
  EXPECT_FALSE(handle3.is_reused());
  EXPECT_THAT(callback4.WaitForResult(), IsOk());
  EXPECT_FALSE(handle4.is_reused());
}

// Regression test for http://crbug.com/42267.
// When DoReleaseSocket() is processed for one socket, it is blocked because the
// other stalled groups all have releasing sockets, so no progress can be made.
TEST_F(ClientSocketPoolBaseTest, SocketLimitReleasingSockets) {
  CreatePoolWithIdleTimeouts(
      4 /* socket limit */, 4 /* socket limit per group */,
      base::TimeDelta(),  // Time out unused sockets immediately.
      base::TimeDelta::FromDays(1));  // Don't time out used sockets.

  connect_job_factory_->set_job_type(TestConnectJob::kMockJob);

  // Max out the socket limit with 2 per group.

  ClientSocketHandle handle_a[4];
  TestCompletionCallback callback_a[4];
  ClientSocketHandle handle_b[4];
  TestCompletionCallback callback_b[4];

  for (int i = 0; i < 2; ++i) {
    EXPECT_EQ(OK, handle_a[i].Init("a", params_, LOWEST,
                                   ClientSocketPool::RespectLimits::ENABLED,
                                   callback_a[i].callback(), pool_.get(),
                                   NetLogWithSource()));
    EXPECT_EQ(OK, handle_b[i].Init("b", params_, LOWEST,
                                   ClientSocketPool::RespectLimits::ENABLED,
                                   callback_b[i].callback(), pool_.get(),
                                   NetLogWithSource()));
  }

  // Make 4 pending requests, 2 per group.

  for (int i = 2; i < 4; ++i) {
    EXPECT_EQ(ERR_IO_PENDING,
              handle_a[i].Init("a", params_, LOWEST,
                               ClientSocketPool::RespectLimits::ENABLED,
                               callback_a[i].callback(), pool_.get(),
                               NetLogWithSource()));
    EXPECT_EQ(ERR_IO_PENDING,
              handle_b[i].Init("b", params_, LOWEST,
                               ClientSocketPool::RespectLimits::ENABLED,
                               callback_b[i].callback(), pool_.get(),
                               NetLogWithSource()));
  }

  // Release b's socket first.  The order is important, because in
  // DoReleaseSocket(), we'll process b's released socket, and since both b and
  // a are stalled, but 'a' is lower lexicographically, we'll process group 'a'
  // first, which has a releasing socket, so it refuses to start up another
  // ConnectJob.  So, we used to infinite loop on this.
  handle_b[0].socket()->Disconnect();
  handle_b[0].Reset();
  handle_a[0].socket()->Disconnect();
  handle_a[0].Reset();

  // Used to get stuck here.
  base::RunLoop().RunUntilIdle();

  handle_b[1].socket()->Disconnect();
  handle_b[1].Reset();
  handle_a[1].socket()->Disconnect();
  handle_a[1].Reset();

  for (int i = 2; i < 4; ++i) {
    EXPECT_THAT(callback_b[i].WaitForResult(), IsOk());
    EXPECT_THAT(callback_a[i].WaitForResult(), IsOk());
  }
}

TEST_F(ClientSocketPoolBaseTest,
       ReleasingDisconnectedSocketsMaintainsPriorityOrder) {
  base::HistogramTester histograms;
  CreatePool(kDefaultMaxSockets, kDefaultMaxSocketsPerGroup);

  connect_job_factory_->set_job_type(TestConnectJob::kMockPendingJob);

  EXPECT_THAT(StartRequest("a", DEFAULT_PRIORITY), IsError(ERR_IO_PENDING));
  EXPECT_THAT(StartRequest("a", DEFAULT_PRIORITY), IsError(ERR_IO_PENDING));
  EXPECT_THAT(StartRequest("a", DEFAULT_PRIORITY), IsError(ERR_IO_PENDING));
  EXPECT_THAT(StartRequest("a", DEFAULT_PRIORITY), IsError(ERR_IO_PENDING));

  EXPECT_THAT((*requests())[0]->WaitForResult(), IsOk());
  EXPECT_THAT((*requests())[1]->WaitForResult(), IsOk());
  EXPECT_EQ(2u, completion_count());

  // Releases one connection.
  EXPECT_TRUE(ReleaseOneConnection(ClientSocketPoolTest::NO_KEEP_ALIVE));
  EXPECT_THAT((*requests())[2]->WaitForResult(), IsOk());
  EXPECT_THAT(histograms.GetAllSamples(kIdleSocketFateHistogram),
              testing::ElementsAre(
                  base::Bucket(/*IDLE_SOCKET_FATE_RELEASE_UNUSABLE=*/3, 1)));

  EXPECT_TRUE(ReleaseOneConnection(ClientSocketPoolTest::NO_KEEP_ALIVE));
  EXPECT_THAT((*requests())[3]->WaitForResult(), IsOk());
  EXPECT_EQ(4u, completion_count());
  EXPECT_THAT(histograms.GetAllSamples(kIdleSocketFateHistogram),
              testing::ElementsAre(
                  base::Bucket(/*IDLE_SOCKET_FATE_RELEASE_UNUSABLE=*/3, 2)));

  EXPECT_EQ(1, GetOrderOfRequest(1));
  EXPECT_EQ(2, GetOrderOfRequest(2));
  EXPECT_EQ(3, GetOrderOfRequest(3));
  EXPECT_EQ(4, GetOrderOfRequest(4));

  // Make sure we test order of all requests made.
  EXPECT_EQ(ClientSocketPoolTest::kIndexOutOfBounds, GetOrderOfRequest(5));
}

class TestReleasingSocketRequest : public TestCompletionCallbackBase {
 public:
  TestReleasingSocketRequest(TestClientSocketPool* pool,
                             int expected_result,
                             bool reset_releasing_handle)
      : pool_(pool),
        expected_result_(expected_result),
        reset_releasing_handle_(reset_releasing_handle),
        callback_(base::Bind(&TestReleasingSocketRequest::OnComplete,
                             base::Unretained(this))) {
  }

  ~TestReleasingSocketRequest() override {}

  ClientSocketHandle* handle() { return &handle_; }

  const CompletionCallback& callback() const { return callback_; }

 private:
  void OnComplete(int result) {
    SetResult(result);
    if (reset_releasing_handle_)
      handle_.Reset();

    scoped_refptr<TestSocketParams> con_params(new TestSocketParams());
    EXPECT_EQ(expected_result_,
              handle2_.Init("a", con_params, DEFAULT_PRIORITY,
                            ClientSocketPool::RespectLimits::ENABLED,
                            callback2_.callback(), pool_, NetLogWithSource()));
  }

  TestClientSocketPool* const pool_;
  int expected_result_;
  bool reset_releasing_handle_;
  ClientSocketHandle handle_;
  ClientSocketHandle handle2_;
  CompletionCallback callback_;
  TestCompletionCallback callback2_;
};


TEST_F(ClientSocketPoolBaseTest, AdditionalErrorSocketsDontUseSlot) {
  CreatePool(kDefaultMaxSockets, kDefaultMaxSocketsPerGroup);

  EXPECT_THAT(StartRequest("b", DEFAULT_PRIORITY), IsOk());
  EXPECT_THAT(StartRequest("a", DEFAULT_PRIORITY), IsOk());
  EXPECT_THAT(StartRequest("b", DEFAULT_PRIORITY), IsOk());

  EXPECT_EQ(static_cast<int>(requests_size()),
            client_socket_factory_.allocation_count());

  connect_job_factory_->set_job_type(
      TestConnectJob::kMockPendingAdditionalErrorStateJob);
  TestReleasingSocketRequest req(pool_.get(), OK, false);
  EXPECT_EQ(
      ERR_IO_PENDING,
      req.handle()->Init("a", params_, DEFAULT_PRIORITY,
                         ClientSocketPool::RespectLimits::ENABLED,
                         req.callback(), pool_.get(), NetLogWithSource()));
  // The next job should complete synchronously
  connect_job_factory_->set_job_type(TestConnectJob::kMockJob);

  EXPECT_THAT(req.WaitForResult(), IsError(ERR_CONNECTION_FAILED));
  EXPECT_FALSE(req.handle()->is_initialized());
  EXPECT_FALSE(req.handle()->socket());
  EXPECT_TRUE(req.handle()->is_ssl_error());
  EXPECT_FALSE(req.handle()->ssl_error_response_info().headers.get() == NULL);
}

// http://crbug.com/44724 regression test.
// We start releasing the pool when we flush on network change.  When that
// happens, the only active references are in the ClientSocketHandles.  When a
// ConnectJob completes and calls back into the last ClientSocketHandle, that
// callback can release the last reference and delete the pool.  After the
// callback finishes, we go back to the stack frame within the now-deleted pool.
// Executing any code that refers to members of the now-deleted pool can cause
// crashes.
TEST_F(ClientSocketPoolBaseTest, CallbackThatReleasesPool) {
  CreatePool(kDefaultMaxSockets, kDefaultMaxSocketsPerGroup);
  connect_job_factory_->set_job_type(TestConnectJob::kMockPendingFailingJob);

  ClientSocketHandle handle;
  TestCompletionCallback callback;
  EXPECT_EQ(ERR_IO_PENDING,
            handle.Init("a", params_, DEFAULT_PRIORITY,
                        ClientSocketPool::RespectLimits::ENABLED,
                        callback.callback(), pool_.get(), NetLogWithSource()));

  pool_->FlushWithError(ERR_NETWORK_CHANGED);

  // We'll call back into this now.
  callback.WaitForResult();
}

TEST_F(ClientSocketPoolBaseTest, DoNotReuseSocketAfterFlush) {
  CreatePool(kDefaultMaxSockets, kDefaultMaxSocketsPerGroup);
  connect_job_factory_->set_job_type(TestConnectJob::kMockPendingJob);

  ClientSocketHandle handle;
  TestCompletionCallback callback;
  EXPECT_EQ(ERR_IO_PENDING,
            handle.Init("a", params_, DEFAULT_PRIORITY,
                        ClientSocketPool::RespectLimits::ENABLED,
                        callback.callback(), pool_.get(), NetLogWithSource()));
  EXPECT_THAT(callback.WaitForResult(), IsOk());
  EXPECT_EQ(ClientSocketHandle::UNUSED, handle.reuse_type());

  pool_->FlushWithError(ERR_NETWORK_CHANGED);

  handle.Reset();
  base::RunLoop().RunUntilIdle();

  EXPECT_EQ(ERR_IO_PENDING,
            handle.Init("a", params_, DEFAULT_PRIORITY,
                        ClientSocketPool::RespectLimits::ENABLED,
                        callback.callback(), pool_.get(), NetLogWithSource()));
  EXPECT_THAT(callback.WaitForResult(), IsOk());
  EXPECT_EQ(ClientSocketHandle::UNUSED, handle.reuse_type());
}

class ConnectWithinCallback : public TestCompletionCallbackBase {
 public:
  ConnectWithinCallback(
      const std::string& group_name,
      const scoped_refptr<TestSocketParams>& params,
      TestClientSocketPool* pool)
      : group_name_(group_name),
        params_(params),
        pool_(pool),
        callback_(base::Bind(&ConnectWithinCallback::OnComplete,
                             base::Unretained(this))) {
  }

  ~ConnectWithinCallback() override {}

  int WaitForNestedResult() {
    return nested_callback_.WaitForResult();
  }

  const CompletionCallback& callback() const { return callback_; }

 private:
  void OnComplete(int result) {
    SetResult(result);
    EXPECT_EQ(
        ERR_IO_PENDING,
        handle_.Init(group_name_, params_, DEFAULT_PRIORITY,
                     ClientSocketPool::RespectLimits::ENABLED,
                     nested_callback_.callback(), pool_, NetLogWithSource()));
  }

  const std::string group_name_;
  const scoped_refptr<TestSocketParams> params_;
  TestClientSocketPool* const pool_;
  ClientSocketHandle handle_;
  CompletionCallback callback_;
  TestCompletionCallback nested_callback_;

  DISALLOW_COPY_AND_ASSIGN(ConnectWithinCallback);
};

TEST_F(ClientSocketPoolBaseTest, AbortAllRequestsOnFlush) {
  CreatePool(kDefaultMaxSockets, kDefaultMaxSocketsPerGroup);

  // First job will be waiting until it gets aborted.
  connect_job_factory_->set_job_type(TestConnectJob::kMockWaitingJob);

  ClientSocketHandle handle;
  ConnectWithinCallback callback("a", params_, pool_.get());
  EXPECT_EQ(ERR_IO_PENDING,
            handle.Init("a", params_, DEFAULT_PRIORITY,
                        ClientSocketPool::RespectLimits::ENABLED,
                        callback.callback(), pool_.get(), NetLogWithSource()));

  // Second job will be started during the first callback, and will
  // asynchronously complete with OK.
  connect_job_factory_->set_job_type(TestConnectJob::kMockPendingJob);
  pool_->FlushWithError(ERR_NETWORK_CHANGED);
  EXPECT_THAT(callback.WaitForResult(), IsError(ERR_NETWORK_CHANGED));
  EXPECT_THAT(callback.WaitForNestedResult(), IsOk());
}

// Cancel a pending socket request while we're at max sockets,
// and verify that the backup socket firing doesn't cause a crash.
TEST_F(ClientSocketPoolBaseTest, BackupSocketCancelAtMaxSockets) {
  // Max 4 sockets globally, max 4 sockets per group.
  CreatePool(kDefaultMaxSockets, kDefaultMaxSockets);
  pool_->EnableConnectBackupJobs();

  // Create the first socket and set to ERR_IO_PENDING.  This starts the backup
  // timer.
  connect_job_factory_->set_job_type(TestConnectJob::kMockWaitingJob);
  ClientSocketHandle handle;
  TestCompletionCallback callback;
  EXPECT_EQ(ERR_IO_PENDING,
            handle.Init("bar", params_, DEFAULT_PRIORITY,
                        ClientSocketPool::RespectLimits::ENABLED,
                        callback.callback(), pool_.get(), NetLogWithSource()));

  // Start (MaxSockets - 1) connected sockets to reach max sockets.
  connect_job_factory_->set_job_type(TestConnectJob::kMockJob);
  ClientSocketHandle handles[kDefaultMaxSockets];
  for (int i = 1; i < kDefaultMaxSockets; ++i) {
    TestCompletionCallback callback;
    EXPECT_EQ(OK, handles[i].Init("bar", params_, DEFAULT_PRIORITY,
                                  ClientSocketPool::RespectLimits::ENABLED,
                                  callback.callback(), pool_.get(),
                                  NetLogWithSource()));
  }

  base::RunLoop().RunUntilIdle();

  // Cancel the pending request.
  handle.Reset();

  // Wait for the backup timer to fire (add some slop to ensure it fires)
  base::PlatformThread::Sleep(base::TimeDelta::FromMilliseconds(
      ClientSocketPool::kMaxConnectRetryIntervalMs / 2 * 3));

  base::RunLoop().RunUntilIdle();
  EXPECT_EQ(kDefaultMaxSockets, client_socket_factory_.allocation_count());
}

TEST_F(ClientSocketPoolBaseTest, CancelBackupSocketAfterCancelingAllRequests) {
  CreatePool(kDefaultMaxSockets, kDefaultMaxSockets);
  pool_->EnableConnectBackupJobs();

  // Create the first socket and set to ERR_IO_PENDING.  This starts the backup
  // timer.
  connect_job_factory_->set_job_type(TestConnectJob::kMockWaitingJob);
  ClientSocketHandle handle;
  TestCompletionCallback callback;
  EXPECT_EQ(ERR_IO_PENDING,
            handle.Init("bar", params_, DEFAULT_PRIORITY,
                        ClientSocketPool::RespectLimits::ENABLED,
                        callback.callback(), pool_.get(), NetLogWithSource()));
  ASSERT_TRUE(pool_->HasGroup("bar"));
  EXPECT_EQ(1, pool_->NumConnectJobsInGroup("bar"));
  EXPECT_EQ(0, pool_->NumUnassignedConnectJobsInGroup("bar"));

  // Cancel the socket request.  This should cancel the backup timer.  Wait for
  // the backup time to see if it indeed got canceled.
  handle.Reset();
  // Wait for the backup timer to fire (add some slop to ensure it fires)
  base::PlatformThread::Sleep(base::TimeDelta::FromMilliseconds(
      ClientSocketPool::kMaxConnectRetryIntervalMs / 2 * 3));
  base::RunLoop().RunUntilIdle();
  ASSERT_TRUE(pool_->HasGroup("bar"));
  EXPECT_EQ(1, pool_->NumConnectJobsInGroup("bar"));
}

TEST_F(ClientSocketPoolBaseTest, CancelBackupSocketAfterFinishingAllRequests) {
  CreatePool(kDefaultMaxSockets, kDefaultMaxSockets);
  pool_->EnableConnectBackupJobs();

  // Create the first socket and set to ERR_IO_PENDING.  This starts the backup
  // timer.
  connect_job_factory_->set_job_type(TestConnectJob::kMockWaitingJob);
  ClientSocketHandle handle;
  TestCompletionCallback callback;
  EXPECT_EQ(ERR_IO_PENDING,
            handle.Init("bar", params_, DEFAULT_PRIORITY,
                        ClientSocketPool::RespectLimits::ENABLED,
                        callback.callback(), pool_.get(), NetLogWithSource()));
  connect_job_factory_->set_job_type(TestConnectJob::kMockPendingJob);
  ClientSocketHandle handle2;
  TestCompletionCallback callback2;
  EXPECT_EQ(
      ERR_IO_PENDING,
      handle2.Init("bar", params_, DEFAULT_PRIORITY,
                   ClientSocketPool::RespectLimits::ENABLED,
                   callback2.callback(), pool_.get(), NetLogWithSource()));
  ASSERT_TRUE(pool_->HasGroup("bar"));
  EXPECT_EQ(2, pool_->NumConnectJobsInGroup("bar"));

  // Cancel request 1 and then complete request 2.  With the requests finished,
  // the backup timer should be cancelled.
  handle.Reset();
  EXPECT_THAT(callback2.WaitForResult(), IsOk());
  // Wait for the backup timer to fire (add some slop to ensure it fires)
  base::PlatformThread::Sleep(base::TimeDelta::FromMilliseconds(
      ClientSocketPool::kMaxConnectRetryIntervalMs / 2 * 3));
  base::RunLoop().RunUntilIdle();
}

// Test delayed socket binding for the case where we have two connects,
// and while one is waiting on a connect, the other frees up.
// The socket waiting on a connect should switch immediately to the freed
// up socket.
TEST_F(ClientSocketPoolBaseTest, DelayedSocketBindingWaitingForConnect) {
  CreatePool(kDefaultMaxSockets, kDefaultMaxSocketsPerGroup);
  connect_job_factory_->set_job_type(TestConnectJob::kMockPendingJob);

  ClientSocketHandle handle1;
  TestCompletionCallback callback;
  EXPECT_EQ(ERR_IO_PENDING,
            handle1.Init("a", params_, DEFAULT_PRIORITY,
                         ClientSocketPool::RespectLimits::ENABLED,
                         callback.callback(), pool_.get(), NetLogWithSource()));
  EXPECT_THAT(callback.WaitForResult(), IsOk());

  // No idle sockets, no pending jobs.
  EXPECT_EQ(0, pool_->IdleSocketCount());
  EXPECT_EQ(0, pool_->NumConnectJobsInGroup("a"));

  // Create a second socket to the same host, but this one will wait.
  connect_job_factory_->set_job_type(TestConnectJob::kMockWaitingJob);
  ClientSocketHandle handle2;
  EXPECT_EQ(ERR_IO_PENDING,
            handle2.Init("a", params_, DEFAULT_PRIORITY,
                         ClientSocketPool::RespectLimits::ENABLED,
                         callback.callback(), pool_.get(), NetLogWithSource()));
  // No idle sockets, and one connecting job.
  EXPECT_EQ(0, pool_->IdleSocketCount());
  EXPECT_EQ(1, pool_->NumConnectJobsInGroup("a"));

  // Return the first handle to the pool.  This will initiate the delayed
  // binding.
  handle1.Reset();

  base::RunLoop().RunUntilIdle();

  // Still no idle sockets, still one pending connect job.
  EXPECT_EQ(0, pool_->IdleSocketCount());
  EXPECT_EQ(1, pool_->NumConnectJobsInGroup("a"));

  // The second socket connected, even though it was a Waiting Job.
  EXPECT_THAT(callback.WaitForResult(), IsOk());

  // And we can see there is still one job waiting.
  EXPECT_EQ(1, pool_->NumConnectJobsInGroup("a"));

  // Finally, signal the waiting Connect.
  client_socket_factory_.SignalJobs();
  EXPECT_EQ(0, pool_->NumConnectJobsInGroup("a"));

  base::RunLoop().RunUntilIdle();
}

// Test delayed socket binding when a group is at capacity and one
// of the group's sockets frees up.
TEST_F(ClientSocketPoolBaseTest, DelayedSocketBindingAtGroupCapacity) {
  CreatePool(kDefaultMaxSockets, kDefaultMaxSocketsPerGroup);
  connect_job_factory_->set_job_type(TestConnectJob::kMockPendingJob);

  ClientSocketHandle handle1;
  TestCompletionCallback callback;
  EXPECT_EQ(ERR_IO_PENDING,
            handle1.Init("a", params_, DEFAULT_PRIORITY,
                         ClientSocketPool::RespectLimits::ENABLED,
                         callback.callback(), pool_.get(), NetLogWithSource()));
  EXPECT_THAT(callback.WaitForResult(), IsOk());

  // No idle sockets, no pending jobs.
  EXPECT_EQ(0, pool_->IdleSocketCount());
  EXPECT_EQ(0, pool_->NumConnectJobsInGroup("a"));

  // Create a second socket to the same host, but this one will wait.
  connect_job_factory_->set_job_type(TestConnectJob::kMockWaitingJob);
  ClientSocketHandle handle2;
  EXPECT_EQ(ERR_IO_PENDING,
            handle2.Init("a", params_, DEFAULT_PRIORITY,
                         ClientSocketPool::RespectLimits::ENABLED,
                         callback.callback(), pool_.get(), NetLogWithSource()));
  // No idle sockets, and one connecting job.
  EXPECT_EQ(0, pool_->IdleSocketCount());
  EXPECT_EQ(1, pool_->NumConnectJobsInGroup("a"));

  // Return the first handle to the pool.  This will initiate the delayed
  // binding.
  handle1.Reset();

  base::RunLoop().RunUntilIdle();

  // Still no idle sockets, still one pending connect job.
  EXPECT_EQ(0, pool_->IdleSocketCount());
  EXPECT_EQ(1, pool_->NumConnectJobsInGroup("a"));

  // The second socket connected, even though it was a Waiting Job.
  EXPECT_THAT(callback.WaitForResult(), IsOk());

  // And we can see there is still one job waiting.
  EXPECT_EQ(1, pool_->NumConnectJobsInGroup("a"));

  // Finally, signal the waiting Connect.
  client_socket_factory_.SignalJobs();
  EXPECT_EQ(0, pool_->NumConnectJobsInGroup("a"));

  base::RunLoop().RunUntilIdle();
}

// Test out the case where we have one socket connected, one
// connecting, when the first socket finishes and goes idle.
// Although the second connection is pending, the second request
// should complete, by taking the first socket's idle socket.
TEST_F(ClientSocketPoolBaseTest, DelayedSocketBindingAtStall) {
  CreatePool(kDefaultMaxSockets, kDefaultMaxSocketsPerGroup);
  connect_job_factory_->set_job_type(TestConnectJob::kMockPendingJob);

  ClientSocketHandle handle1;
  TestCompletionCallback callback;
  EXPECT_EQ(ERR_IO_PENDING,
            handle1.Init("a", params_, DEFAULT_PRIORITY,
                         ClientSocketPool::RespectLimits::ENABLED,
                         callback.callback(), pool_.get(), NetLogWithSource()));
  EXPECT_THAT(callback.WaitForResult(), IsOk());

  // No idle sockets, no pending jobs.
  EXPECT_EQ(0, pool_->IdleSocketCount());
  EXPECT_EQ(0, pool_->NumConnectJobsInGroup("a"));

  // Create a second socket to the same host, but this one will wait.
  connect_job_factory_->set_job_type(TestConnectJob::kMockWaitingJob);
  ClientSocketHandle handle2;
  EXPECT_EQ(ERR_IO_PENDING,
            handle2.Init("a", params_, DEFAULT_PRIORITY,
                         ClientSocketPool::RespectLimits::ENABLED,
                         callback.callback(), pool_.get(), NetLogWithSource()));
  // No idle sockets, and one connecting job.
  EXPECT_EQ(0, pool_->IdleSocketCount());
  EXPECT_EQ(1, pool_->NumConnectJobsInGroup("a"));

  // Return the first handle to the pool.  This will initiate the delayed
  // binding.
  handle1.Reset();

  base::RunLoop().RunUntilIdle();

  // Still no idle sockets, still one pending connect job.
  EXPECT_EQ(0, pool_->IdleSocketCount());
  EXPECT_EQ(1, pool_->NumConnectJobsInGroup("a"));

  // The second socket connected, even though it was a Waiting Job.
  EXPECT_THAT(callback.WaitForResult(), IsOk());

  // And we can see there is still one job waiting.
  EXPECT_EQ(1, pool_->NumConnectJobsInGroup("a"));

  // Finally, signal the waiting Connect.
  client_socket_factory_.SignalJobs();
  EXPECT_EQ(0, pool_->NumConnectJobsInGroup("a"));

  base::RunLoop().RunUntilIdle();
}

// Cover the case where on an available socket slot, we have one pending
// request that completes synchronously, thereby making the Group empty.
TEST_F(ClientSocketPoolBaseTest, SynchronouslyProcessOnePendingRequest) {
  const int kUnlimitedSockets = 100;
  const int kOneSocketPerGroup = 1;
  CreatePool(kUnlimitedSockets, kOneSocketPerGroup);

  // Make the first request asynchronous fail.
  // This will free up a socket slot later.
  connect_job_factory_->set_job_type(TestConnectJob::kMockPendingFailingJob);

  ClientSocketHandle handle1;
  TestCompletionCallback callback1;
  EXPECT_EQ(
      ERR_IO_PENDING,
      handle1.Init("a", params_, DEFAULT_PRIORITY,
                   ClientSocketPool::RespectLimits::ENABLED,
                   callback1.callback(), pool_.get(), NetLogWithSource()));
  EXPECT_EQ(1, pool_->NumConnectJobsInGroup("a"));

  // Make the second request synchronously fail.  This should make the Group
  // empty.
  connect_job_factory_->set_job_type(TestConnectJob::kMockFailingJob);
  ClientSocketHandle handle2;
  TestCompletionCallback callback2;
  // It'll be ERR_IO_PENDING now, but the TestConnectJob will synchronously fail
  // when created.
  EXPECT_EQ(
      ERR_IO_PENDING,
      handle2.Init("a", params_, DEFAULT_PRIORITY,
                   ClientSocketPool::RespectLimits::ENABLED,
                   callback2.callback(), pool_.get(), NetLogWithSource()));

  EXPECT_EQ(1, pool_->NumConnectJobsInGroup("a"));

  EXPECT_THAT(callback1.WaitForResult(), IsError(ERR_CONNECTION_FAILED));
  EXPECT_THAT(callback2.WaitForResult(), IsError(ERR_CONNECTION_FAILED));
  EXPECT_FALSE(pool_->HasGroup("a"));
}

TEST_F(ClientSocketPoolBaseTest, PreferUsedSocketToUnusedSocket) {
  CreatePool(kDefaultMaxSockets, kDefaultMaxSockets);

  connect_job_factory_->set_job_type(TestConnectJob::kMockPendingJob);

  ClientSocketHandle handle1;
  TestCompletionCallback callback1;
  EXPECT_EQ(
      ERR_IO_PENDING,
      handle1.Init("a", params_, DEFAULT_PRIORITY,
                   ClientSocketPool::RespectLimits::ENABLED,
                   callback1.callback(), pool_.get(), NetLogWithSource()));

  ClientSocketHandle handle2;
  TestCompletionCallback callback2;
  EXPECT_EQ(
      ERR_IO_PENDING,
      handle2.Init("a", params_, DEFAULT_PRIORITY,
                   ClientSocketPool::RespectLimits::ENABLED,
                   callback2.callback(), pool_.get(), NetLogWithSource()));
  ClientSocketHandle handle3;
  TestCompletionCallback callback3;
  EXPECT_EQ(
      ERR_IO_PENDING,
      handle3.Init("a", params_, DEFAULT_PRIORITY,
                   ClientSocketPool::RespectLimits::ENABLED,
                   callback3.callback(), pool_.get(), NetLogWithSource()));

  EXPECT_THAT(callback1.WaitForResult(), IsOk());
  EXPECT_THAT(callback2.WaitForResult(), IsOk());
  EXPECT_THAT(callback3.WaitForResult(), IsOk());

  // Use the socket.
  EXPECT_EQ(1, handle1.socket()->Write(NULL, 1, CompletionCallback()));
  EXPECT_EQ(1, handle3.socket()->Write(NULL, 1, CompletionCallback()));

  handle1.Reset();
  handle2.Reset();
  handle3.Reset();

  EXPECT_EQ(
      OK, handle1.Init("a", params_, DEFAULT_PRIORITY,
                       ClientSocketPool::RespectLimits::ENABLED,
                       callback1.callback(), pool_.get(), NetLogWithSource()));
  EXPECT_EQ(
      OK, handle2.Init("a", params_, DEFAULT_PRIORITY,
                       ClientSocketPool::RespectLimits::ENABLED,
                       callback2.callback(), pool_.get(), NetLogWithSource()));
  EXPECT_EQ(
      OK, handle3.Init("a", params_, DEFAULT_PRIORITY,
                       ClientSocketPool::RespectLimits::ENABLED,
                       callback3.callback(), pool_.get(), NetLogWithSource()));

  EXPECT_TRUE(handle1.socket()->WasEverUsed());
  EXPECT_TRUE(handle2.socket()->WasEverUsed());
  EXPECT_FALSE(handle3.socket()->WasEverUsed());
}

TEST_F(ClientSocketPoolBaseTest, RequestSockets) {
  CreatePool(kDefaultMaxSockets, kDefaultMaxSocketsPerGroup);
  connect_job_factory_->set_job_type(TestConnectJob::kMockPendingJob);

  pool_->RequestSockets("a", &params_, 2, NetLogWithSource());

  ASSERT_TRUE(pool_->HasGroup("a"));
  EXPECT_EQ(2, pool_->NumConnectJobsInGroup("a"));
  EXPECT_EQ(2, pool_->NumUnassignedConnectJobsInGroup("a"));
  EXPECT_EQ(0, pool_->IdleSocketCountInGroup("a"));

  ClientSocketHandle handle1;
  TestCompletionCallback callback1;
  EXPECT_EQ(
      ERR_IO_PENDING,
      handle1.Init("a", params_, DEFAULT_PRIORITY,
                   ClientSocketPool::RespectLimits::ENABLED,
                   callback1.callback(), pool_.get(), NetLogWithSource()));

  ClientSocketHandle handle2;
  TestCompletionCallback callback2;
  EXPECT_EQ(
      ERR_IO_PENDING,
      handle2.Init("a", params_, DEFAULT_PRIORITY,
                   ClientSocketPool::RespectLimits::ENABLED,
                   callback2.callback(), pool_.get(), NetLogWithSource()));

  EXPECT_EQ(2, pool_->NumConnectJobsInGroup("a"));
  EXPECT_EQ(0, pool_->NumUnassignedConnectJobsInGroup("a"));
  EXPECT_EQ(0, pool_->IdleSocketCountInGroup("a"));

  EXPECT_THAT(callback1.WaitForResult(), IsOk());
  EXPECT_THAT(callback2.WaitForResult(), IsOk());
  handle1.Reset();
  handle2.Reset();

  EXPECT_EQ(0, pool_->NumConnectJobsInGroup("a"));
  EXPECT_EQ(0, pool_->NumUnassignedConnectJobsInGroup("a"));
  EXPECT_EQ(2, pool_->IdleSocketCountInGroup("a"));
}

TEST_F(ClientSocketPoolBaseTest, RequestSocketsWhenAlreadyHaveAConnectJob) {
  CreatePool(kDefaultMaxSockets, kDefaultMaxSocketsPerGroup);
  connect_job_factory_->set_job_type(TestConnectJob::kMockPendingJob);

  ClientSocketHandle handle1;
  TestCompletionCallback callback1;
  EXPECT_EQ(
      ERR_IO_PENDING,
      handle1.Init("a", params_, DEFAULT_PRIORITY,
                   ClientSocketPool::RespectLimits::ENABLED,
                   callback1.callback(), pool_.get(), NetLogWithSource()));

  ASSERT_TRUE(pool_->HasGroup("a"));
  EXPECT_EQ(1, pool_->NumConnectJobsInGroup("a"));
  EXPECT_EQ(0, pool_->NumUnassignedConnectJobsInGroup("a"));
  EXPECT_EQ(0, pool_->IdleSocketCountInGroup("a"));

  pool_->RequestSockets("a", &params_, 2, NetLogWithSource());

  EXPECT_EQ(2, pool_->NumConnectJobsInGroup("a"));
  EXPECT_EQ(1, pool_->NumUnassignedConnectJobsInGroup("a"));
  EXPECT_EQ(0, pool_->IdleSocketCountInGroup("a"));

  ClientSocketHandle handle2;
  TestCompletionCallback callback2;
  EXPECT_EQ(
      ERR_IO_PENDING,
      handle2.Init("a", params_, DEFAULT_PRIORITY,
                   ClientSocketPool::RespectLimits::ENABLED,
                   callback2.callback(), pool_.get(), NetLogWithSource()));

  EXPECT_EQ(2, pool_->NumConnectJobsInGroup("a"));
  EXPECT_EQ(0, pool_->NumUnassignedConnectJobsInGroup("a"));
  EXPECT_EQ(0, pool_->IdleSocketCountInGroup("a"));

  EXPECT_THAT(callback1.WaitForResult(), IsOk());
  EXPECT_THAT(callback2.WaitForResult(), IsOk());
  handle1.Reset();
  handle2.Reset();

  EXPECT_EQ(0, pool_->NumConnectJobsInGroup("a"));
  EXPECT_EQ(0, pool_->NumUnassignedConnectJobsInGroup("a"));
  EXPECT_EQ(2, pool_->IdleSocketCountInGroup("a"));
}

TEST_F(ClientSocketPoolBaseTest,
       RequestSocketsWhenAlreadyHaveMultipleConnectJob) {
  CreatePool(4, 4);
  connect_job_factory_->set_job_type(TestConnectJob::kMockPendingJob);

  ClientSocketHandle handle1;
  TestCompletionCallback callback1;
  EXPECT_EQ(
      ERR_IO_PENDING,
      handle1.Init("a", params_, DEFAULT_PRIORITY,
                   ClientSocketPool::RespectLimits::ENABLED,
                   callback1.callback(), pool_.get(), NetLogWithSource()));

  ClientSocketHandle handle2;
  TestCompletionCallback callback2;
  EXPECT_EQ(
      ERR_IO_PENDING,
      handle2.Init("a", params_, DEFAULT_PRIORITY,
                   ClientSocketPool::RespectLimits::ENABLED,
                   callback2.callback(), pool_.get(), NetLogWithSource()));

  ClientSocketHandle handle3;
  TestCompletionCallback callback3;
  EXPECT_EQ(
      ERR_IO_PENDING,
      handle3.Init("a", params_, DEFAULT_PRIORITY,
                   ClientSocketPool::RespectLimits::ENABLED,
                   callback3.callback(), pool_.get(), NetLogWithSource()));

  ASSERT_TRUE(pool_->HasGroup("a"));
  EXPECT_EQ(3, pool_->NumConnectJobsInGroup("a"));
  EXPECT_EQ(0, pool_->NumUnassignedConnectJobsInGroup("a"));
  EXPECT_EQ(0, pool_->IdleSocketCountInGroup("a"));

  pool_->RequestSockets("a", &params_, 2, NetLogWithSource());

  EXPECT_EQ(3, pool_->NumConnectJobsInGroup("a"));
  EXPECT_EQ(0, pool_->NumUnassignedConnectJobsInGroup("a"));
  EXPECT_EQ(0, pool_->IdleSocketCountInGroup("a"));

  EXPECT_THAT(callback1.WaitForResult(), IsOk());
  EXPECT_THAT(callback2.WaitForResult(), IsOk());
  EXPECT_THAT(callback3.WaitForResult(), IsOk());
  handle1.Reset();
  handle2.Reset();
  handle3.Reset();

  EXPECT_EQ(0, pool_->NumConnectJobsInGroup("a"));
  EXPECT_EQ(0, pool_->NumUnassignedConnectJobsInGroup("a"));
  EXPECT_EQ(3, pool_->IdleSocketCountInGroup("a"));
}

TEST_F(ClientSocketPoolBaseTest, RequestSocketsAtMaxSocketLimit) {
  CreatePool(kDefaultMaxSockets, kDefaultMaxSockets);
  connect_job_factory_->set_job_type(TestConnectJob::kMockPendingJob);

  ASSERT_FALSE(pool_->HasGroup("a"));

  pool_->RequestSockets("a", &params_, kDefaultMaxSockets, NetLogWithSource());

  ASSERT_TRUE(pool_->HasGroup("a"));
  EXPECT_EQ(kDefaultMaxSockets, pool_->NumConnectJobsInGroup("a"));
  EXPECT_EQ(kDefaultMaxSockets, pool_->NumUnassignedConnectJobsInGroup("a"));

  ASSERT_FALSE(pool_->HasGroup("b"));

  pool_->RequestSockets("b", &params_, kDefaultMaxSockets, NetLogWithSource());

  ASSERT_FALSE(pool_->HasGroup("b"));
}

TEST_F(ClientSocketPoolBaseTest, RequestSocketsHitMaxSocketLimit) {
  CreatePool(kDefaultMaxSockets, kDefaultMaxSockets);
  connect_job_factory_->set_job_type(TestConnectJob::kMockPendingJob);

  ASSERT_FALSE(pool_->HasGroup("a"));

  pool_->RequestSockets("a", &params_, kDefaultMaxSockets - 1,
                        NetLogWithSource());

  ASSERT_TRUE(pool_->HasGroup("a"));
  EXPECT_EQ(kDefaultMaxSockets - 1, pool_->NumConnectJobsInGroup("a"));
  EXPECT_EQ(kDefaultMaxSockets - 1,
            pool_->NumUnassignedConnectJobsInGroup("a"));
  EXPECT_FALSE(pool_->IsStalled());

  ASSERT_FALSE(pool_->HasGroup("b"));

  pool_->RequestSockets("b", &params_, kDefaultMaxSockets, NetLogWithSource());

  ASSERT_TRUE(pool_->HasGroup("b"));
  EXPECT_EQ(1, pool_->NumConnectJobsInGroup("b"));
  EXPECT_FALSE(pool_->IsStalled());
}

TEST_F(ClientSocketPoolBaseTest, RequestSocketsCountIdleSockets) {
  CreatePool(4, 4);
  connect_job_factory_->set_job_type(TestConnectJob::kMockPendingJob);

  ClientSocketHandle handle1;
  TestCompletionCallback callback1;
  EXPECT_EQ(
      ERR_IO_PENDING,
      handle1.Init("a", params_, DEFAULT_PRIORITY,
                   ClientSocketPool::RespectLimits::ENABLED,
                   callback1.callback(), pool_.get(), NetLogWithSource()));
  ASSERT_THAT(callback1.WaitForResult(), IsOk());
  handle1.Reset();

  ASSERT_TRUE(pool_->HasGroup("a"));
  EXPECT_EQ(0, pool_->NumConnectJobsInGroup("a"));
  EXPECT_EQ(0, pool_->NumUnassignedConnectJobsInGroup("a"));
  EXPECT_EQ(1, pool_->IdleSocketCountInGroup("a"));

  pool_->RequestSockets("a", &params_, 2, NetLogWithSource());

  EXPECT_EQ(1, pool_->NumConnectJobsInGroup("a"));
  EXPECT_EQ(1, pool_->NumUnassignedConnectJobsInGroup("a"));
  EXPECT_EQ(1, pool_->IdleSocketCountInGroup("a"));
}

TEST_F(ClientSocketPoolBaseTest, RequestSocketsCountActiveSockets) {
  CreatePool(4, 4);
  connect_job_factory_->set_job_type(TestConnectJob::kMockPendingJob);

  ClientSocketHandle handle1;
  TestCompletionCallback callback1;
  EXPECT_EQ(
      ERR_IO_PENDING,
      handle1.Init("a", params_, DEFAULT_PRIORITY,
                   ClientSocketPool::RespectLimits::ENABLED,
                   callback1.callback(), pool_.get(), NetLogWithSource()));
  ASSERT_THAT(callback1.WaitForResult(), IsOk());

  ASSERT_TRUE(pool_->HasGroup("a"));
  EXPECT_EQ(0, pool_->NumConnectJobsInGroup("a"));
  EXPECT_EQ(0, pool_->NumUnassignedConnectJobsInGroup("a"));
  EXPECT_EQ(0, pool_->IdleSocketCountInGroup("a"));
  EXPECT_EQ(1, pool_->NumActiveSocketsInGroup("a"));

  pool_->RequestSockets("a", &params_, 2, NetLogWithSource());

  EXPECT_EQ(1, pool_->NumConnectJobsInGroup("a"));
  EXPECT_EQ(1, pool_->NumUnassignedConnectJobsInGroup("a"));
  EXPECT_EQ(0, pool_->IdleSocketCountInGroup("a"));
  EXPECT_EQ(1, pool_->NumActiveSocketsInGroup("a"));
}

TEST_F(ClientSocketPoolBaseTest, RequestSocketsSynchronous) {
  CreatePool(kDefaultMaxSockets, kDefaultMaxSocketsPerGroup);
  connect_job_factory_->set_job_type(TestConnectJob::kMockJob);

  pool_->RequestSockets("a", &params_, kDefaultMaxSocketsPerGroup,
                        NetLogWithSource());

  ASSERT_TRUE(pool_->HasGroup("a"));
  EXPECT_EQ(0, pool_->NumConnectJobsInGroup("a"));
  EXPECT_EQ(0, pool_->NumUnassignedConnectJobsInGroup("a"));
  EXPECT_EQ(kDefaultMaxSocketsPerGroup, pool_->IdleSocketCountInGroup("a"));

  pool_->RequestSockets("b", &params_, kDefaultMaxSocketsPerGroup,
                        NetLogWithSource());

  EXPECT_EQ(0, pool_->NumConnectJobsInGroup("b"));
  EXPECT_EQ(0, pool_->NumUnassignedConnectJobsInGroup("b"));
  EXPECT_EQ(kDefaultMaxSocketsPerGroup, pool_->IdleSocketCountInGroup("b"));
}

TEST_F(ClientSocketPoolBaseTest, RequestSocketsSynchronousError) {
  CreatePool(kDefaultMaxSockets, kDefaultMaxSocketsPerGroup);
  connect_job_factory_->set_job_type(TestConnectJob::kMockFailingJob);

  pool_->RequestSockets("a", &params_, kDefaultMaxSocketsPerGroup,
                        NetLogWithSource());

  ASSERT_FALSE(pool_->HasGroup("a"));

  connect_job_factory_->set_job_type(
      TestConnectJob::kMockAdditionalErrorStateJob);
  pool_->RequestSockets("a", &params_, kDefaultMaxSocketsPerGroup,
                        NetLogWithSource());

  ASSERT_FALSE(pool_->HasGroup("a"));
}

TEST_F(ClientSocketPoolBaseTest, RequestSocketsMultipleTimesDoesNothing) {
  CreatePool(4, 4);
  connect_job_factory_->set_job_type(TestConnectJob::kMockPendingJob);

  pool_->RequestSockets("a", &params_, 2, NetLogWithSource());

  ASSERT_TRUE(pool_->HasGroup("a"));
  EXPECT_EQ(2, pool_->NumConnectJobsInGroup("a"));
  EXPECT_EQ(2, pool_->NumUnassignedConnectJobsInGroup("a"));
  EXPECT_EQ(0, pool_->IdleSocketCountInGroup("a"));

  pool_->RequestSockets("a", &params_, 2, NetLogWithSource());
  EXPECT_EQ(2, pool_->NumConnectJobsInGroup("a"));
  EXPECT_EQ(2, pool_->NumUnassignedConnectJobsInGroup("a"));
  EXPECT_EQ(0, pool_->IdleSocketCountInGroup("a"));

  ClientSocketHandle handle1;
  TestCompletionCallback callback1;
  EXPECT_EQ(
      ERR_IO_PENDING,
      handle1.Init("a", params_, DEFAULT_PRIORITY,
                   ClientSocketPool::RespectLimits::ENABLED,
                   callback1.callback(), pool_.get(), NetLogWithSource()));
  ASSERT_THAT(callback1.WaitForResult(), IsOk());

  ClientSocketHandle handle2;
  TestCompletionCallback callback2;
  int rv = handle2.Init("a", params_, DEFAULT_PRIORITY,
                        ClientSocketPool::RespectLimits::ENABLED,
                        callback2.callback(), pool_.get(), NetLogWithSource());
  if (rv != OK) {
    EXPECT_THAT(rv, IsError(ERR_IO_PENDING));
    EXPECT_THAT(callback2.WaitForResult(), IsOk());
  }

  EXPECT_EQ(0, pool_->NumConnectJobsInGroup("a"));
  EXPECT_EQ(0, pool_->NumUnassignedConnectJobsInGroup("a"));
  EXPECT_EQ(2, pool_->NumActiveSocketsInGroup("a"));
  EXPECT_EQ(0, pool_->IdleSocketCountInGroup("a"));

  handle1.Reset();
  handle2.Reset();

  EXPECT_EQ(0, pool_->NumConnectJobsInGroup("a"));
  EXPECT_EQ(0, pool_->NumUnassignedConnectJobsInGroup("a"));
  EXPECT_EQ(2, pool_->IdleSocketCountInGroup("a"));

  pool_->RequestSockets("a", &params_, 2, NetLogWithSource());
  EXPECT_EQ(0, pool_->NumConnectJobsInGroup("a"));
  EXPECT_EQ(0, pool_->NumUnassignedConnectJobsInGroup("a"));
  EXPECT_EQ(2, pool_->IdleSocketCountInGroup("a"));
}

TEST_F(ClientSocketPoolBaseTest, RequestSocketsDifferentNumSockets) {
  CreatePool(4, 4);
  connect_job_factory_->set_job_type(TestConnectJob::kMockPendingJob);

  pool_->RequestSockets("a", &params_, 1, NetLogWithSource());

  ASSERT_TRUE(pool_->HasGroup("a"));
  EXPECT_EQ(1, pool_->NumConnectJobsInGroup("a"));
  EXPECT_EQ(1, pool_->NumUnassignedConnectJobsInGroup("a"));
  EXPECT_EQ(0, pool_->IdleSocketCountInGroup("a"));

  pool_->RequestSockets("a", &params_, 2, NetLogWithSource());
  EXPECT_EQ(2, pool_->NumConnectJobsInGroup("a"));
  EXPECT_EQ(2, pool_->NumUnassignedConnectJobsInGroup("a"));
  EXPECT_EQ(0, pool_->IdleSocketCountInGroup("a"));

  pool_->RequestSockets("a", &params_, 3, NetLogWithSource());
  EXPECT_EQ(3, pool_->NumConnectJobsInGroup("a"));
  EXPECT_EQ(3, pool_->NumUnassignedConnectJobsInGroup("a"));
  EXPECT_EQ(0, pool_->IdleSocketCountInGroup("a"));

  pool_->RequestSockets("a", &params_, 1, NetLogWithSource());
  EXPECT_EQ(3, pool_->NumConnectJobsInGroup("a"));
  EXPECT_EQ(3, pool_->NumUnassignedConnectJobsInGroup("a"));
  EXPECT_EQ(0, pool_->IdleSocketCountInGroup("a"));
}

TEST_F(ClientSocketPoolBaseTest, PreconnectJobsTakenByNormalRequests) {
  CreatePool(kDefaultMaxSockets, kDefaultMaxSocketsPerGroup);
  connect_job_factory_->set_job_type(TestConnectJob::kMockPendingJob);

  pool_->RequestSockets("a", &params_, 1, NetLogWithSource());

  ASSERT_TRUE(pool_->HasGroup("a"));
  EXPECT_EQ(1, pool_->NumConnectJobsInGroup("a"));
  EXPECT_EQ(1, pool_->NumUnassignedConnectJobsInGroup("a"));
  EXPECT_EQ(0, pool_->IdleSocketCountInGroup("a"));

  ClientSocketHandle handle1;
  TestCompletionCallback callback1;
  EXPECT_EQ(
      ERR_IO_PENDING,
      handle1.Init("a", params_, DEFAULT_PRIORITY,
                   ClientSocketPool::RespectLimits::ENABLED,
                   callback1.callback(), pool_.get(), NetLogWithSource()));

  EXPECT_EQ(1, pool_->NumConnectJobsInGroup("a"));
  EXPECT_EQ(0, pool_->NumUnassignedConnectJobsInGroup("a"));
  EXPECT_EQ(0, pool_->IdleSocketCountInGroup("a"));

  ASSERT_THAT(callback1.WaitForResult(), IsOk());

  // Make sure if a preconnected socket is not fully connected when a request
  // starts, it has a connect start time.
  TestLoadTimingInfoConnectedNotReused(handle1);
  handle1.Reset();

  EXPECT_EQ(1, pool_->IdleSocketCountInGroup("a"));
}

// Checks that fully connected preconnect jobs have no connect times, and are
// marked as reused.
TEST_F(ClientSocketPoolBaseTest, ConnectedPreconnectJobsHaveNoConnectTimes) {
  CreatePool(kDefaultMaxSockets, kDefaultMaxSocketsPerGroup);
  connect_job_factory_->set_job_type(TestConnectJob::kMockJob);
  pool_->RequestSockets("a", &params_, 1, NetLogWithSource());

  ASSERT_TRUE(pool_->HasGroup("a"));
  EXPECT_EQ(0, pool_->NumConnectJobsInGroup("a"));
  EXPECT_EQ(0, pool_->NumUnassignedConnectJobsInGroup("a"));
  EXPECT_EQ(1, pool_->IdleSocketCountInGroup("a"));

  ClientSocketHandle handle;
  TestCompletionCallback callback;
  EXPECT_EQ(OK,
            handle.Init("a", params_, DEFAULT_PRIORITY,
                        ClientSocketPool::RespectLimits::ENABLED,
                        callback.callback(), pool_.get(), NetLogWithSource()));

  // Make sure the idle socket was used.
  EXPECT_EQ(0, pool_->IdleSocketCountInGroup("a"));

  TestLoadTimingInfoConnectedReused(handle);
  handle.Reset();
  TestLoadTimingInfoNotConnected(handle);
}

// http://crbug.com/64940 regression test.
TEST_F(ClientSocketPoolBaseTest, PreconnectClosesIdleSocketRemovesGroup) {
  const int kMaxTotalSockets = 3;
  const int kMaxSocketsPerGroup = 2;
  CreatePool(kMaxTotalSockets, kMaxSocketsPerGroup);
  connect_job_factory_->set_job_type(TestConnectJob::kMockPendingJob);

  // Note that group name ordering matters here.  "a" comes before "b", so
  // CloseOneIdleSocket() will try to close "a"'s idle socket.

  // Set up one idle socket in "a".
  ClientSocketHandle handle1;
  TestCompletionCallback callback1;
  EXPECT_EQ(
      ERR_IO_PENDING,
      handle1.Init("a", params_, DEFAULT_PRIORITY,
                   ClientSocketPool::RespectLimits::ENABLED,
                   callback1.callback(), pool_.get(), NetLogWithSource()));

  ASSERT_THAT(callback1.WaitForResult(), IsOk());
  handle1.Reset();
  EXPECT_EQ(1, pool_->IdleSocketCountInGroup("a"));

  // Set up two active sockets in "b".
  ClientSocketHandle handle2;
  TestCompletionCallback callback2;
  EXPECT_EQ(
      ERR_IO_PENDING,
      handle1.Init("b", params_, DEFAULT_PRIORITY,
                   ClientSocketPool::RespectLimits::ENABLED,
                   callback1.callback(), pool_.get(), NetLogWithSource()));
  EXPECT_EQ(
      ERR_IO_PENDING,
      handle2.Init("b", params_, DEFAULT_PRIORITY,
                   ClientSocketPool::RespectLimits::ENABLED,
                   callback2.callback(), pool_.get(), NetLogWithSource()));

  ASSERT_THAT(callback1.WaitForResult(), IsOk());
  ASSERT_THAT(callback2.WaitForResult(), IsOk());
  EXPECT_EQ(0, pool_->IdleSocketCountInGroup("b"));
  EXPECT_EQ(0, pool_->NumUnassignedConnectJobsInGroup("b"));
  EXPECT_EQ(2, pool_->NumActiveSocketsInGroup("b"));

  // Now we have 1 idle socket in "a" and 2 active sockets in "b".  This means
  // we've maxed out on sockets, since we set |kMaxTotalSockets| to 3.
  // Requesting 2 preconnected sockets for "a" should fail to allocate any more
  // sockets for "a", and "b" should still have 2 active sockets.

  pool_->RequestSockets("a", &params_, 2, NetLogWithSource());
  EXPECT_EQ(0, pool_->NumConnectJobsInGroup("a"));
  EXPECT_EQ(0, pool_->NumUnassignedConnectJobsInGroup("a"));
  EXPECT_EQ(1, pool_->IdleSocketCountInGroup("a"));
  EXPECT_EQ(0, pool_->NumActiveSocketsInGroup("a"));
  EXPECT_EQ(0, pool_->NumConnectJobsInGroup("b"));
  EXPECT_EQ(0, pool_->NumUnassignedConnectJobsInGroup("b"));
  EXPECT_EQ(0, pool_->IdleSocketCountInGroup("b"));
  EXPECT_EQ(2, pool_->NumActiveSocketsInGroup("b"));

  // Now release the 2 active sockets for "b".  This will give us 1 idle socket
  // in "a" and 2 idle sockets in "b".  Requesting 2 preconnected sockets for
  // "a" should result in closing 1 for "b".
  handle1.Reset();
  handle2.Reset();
  EXPECT_EQ(2, pool_->IdleSocketCountInGroup("b"));
  EXPECT_EQ(0, pool_->NumActiveSocketsInGroup("b"));

  pool_->RequestSockets("a", &params_, 2, NetLogWithSource());
  EXPECT_EQ(1, pool_->NumConnectJobsInGroup("a"));
  EXPECT_EQ(1, pool_->NumUnassignedConnectJobsInGroup("a"));
  EXPECT_EQ(1, pool_->IdleSocketCountInGroup("a"));
  EXPECT_EQ(0, pool_->NumActiveSocketsInGroup("a"));
  EXPECT_EQ(0, pool_->NumConnectJobsInGroup("b"));
  EXPECT_EQ(0, pool_->NumUnassignedConnectJobsInGroup("b"));
  EXPECT_EQ(1, pool_->IdleSocketCountInGroup("b"));
  EXPECT_EQ(0, pool_->NumActiveSocketsInGroup("b"));
}

TEST_F(ClientSocketPoolBaseTest, PreconnectWithoutBackupJob) {
  CreatePool(kDefaultMaxSockets, kDefaultMaxSocketsPerGroup);
  pool_->EnableConnectBackupJobs();

  // Make the ConnectJob hang until it times out, shorten the timeout.
  connect_job_factory_->set_job_type(TestConnectJob::kMockWaitingJob);
  connect_job_factory_->set_timeout_duration(
      base::TimeDelta::FromMilliseconds(500));
  pool_->RequestSockets("a", &params_, 1, NetLogWithSource());
  EXPECT_EQ(1, pool_->NumConnectJobsInGroup("a"));
  EXPECT_EQ(1, pool_->NumUnassignedConnectJobsInGroup("a"));
  EXPECT_EQ(0, pool_->IdleSocketCountInGroup("a"));

  // Verify the backup timer doesn't create a backup job, by making
  // the backup job a pending job instead of a waiting job, so it
  // *would* complete if it were created.
  connect_job_factory_->set_job_type(TestConnectJob::kMockPendingJob);
  base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
      FROM_HERE, base::MessageLoop::QuitWhenIdleClosure(),
      base::TimeDelta::FromSeconds(1));
  base::RunLoop().Run();
  EXPECT_FALSE(pool_->HasGroup("a"));
}

TEST_F(ClientSocketPoolBaseTest, PreconnectWithBackupJob) {
  CreatePool(kDefaultMaxSockets, kDefaultMaxSocketsPerGroup);
  pool_->EnableConnectBackupJobs();

  // Make the ConnectJob hang forever.
  connect_job_factory_->set_job_type(TestConnectJob::kMockWaitingJob);
  pool_->RequestSockets("a", &params_, 1, NetLogWithSource());
  EXPECT_EQ(1, pool_->NumConnectJobsInGroup("a"));
  EXPECT_EQ(1, pool_->NumUnassignedConnectJobsInGroup("a"));
  EXPECT_EQ(0, pool_->IdleSocketCountInGroup("a"));
  base::RunLoop().RunUntilIdle();

  // Make the backup job be a pending job, so it completes normally.
  connect_job_factory_->set_job_type(TestConnectJob::kMockPendingJob);
  ClientSocketHandle handle;
  TestCompletionCallback callback;
  EXPECT_EQ(ERR_IO_PENDING,
            handle.Init("a", params_, DEFAULT_PRIORITY,
                        ClientSocketPool::RespectLimits::ENABLED,
                        callback.callback(), pool_.get(), NetLogWithSource()));
  // Timer has started, but the backup connect job shouldn't be created yet.
  EXPECT_EQ(1, pool_->NumConnectJobsInGroup("a"));
  EXPECT_EQ(0, pool_->NumUnassignedConnectJobsInGroup("a"));
  EXPECT_EQ(0, pool_->IdleSocketCountInGroup("a"));
  EXPECT_EQ(0, pool_->NumActiveSocketsInGroup("a"));
  ASSERT_THAT(callback.WaitForResult(), IsOk());

  // The hung connect job should still be there, but everything else should be
  // complete.
  EXPECT_EQ(1, pool_->NumConnectJobsInGroup("a"));
  EXPECT_EQ(0, pool_->NumUnassignedConnectJobsInGroup("a"));
  EXPECT_EQ(0, pool_->IdleSocketCountInGroup("a"));
  EXPECT_EQ(1, pool_->NumActiveSocketsInGroup("a"));
}

// Tests that a preconnect that starts out with unread data can still be used.
// http://crbug.com/334467
TEST_F(ClientSocketPoolBaseTest, PreconnectWithUnreadData) {
  CreatePool(kDefaultMaxSockets, kDefaultMaxSocketsPerGroup);
  connect_job_factory_->set_job_type(TestConnectJob::kMockUnreadDataJob);

  pool_->RequestSockets("a", &params_, 1, NetLogWithSource());

  ASSERT_TRUE(pool_->HasGroup("a"));
  EXPECT_EQ(0, pool_->NumConnectJobsInGroup("a"));
  EXPECT_EQ(0, pool_->NumUnassignedConnectJobsInGroup("a"));
  EXPECT_EQ(1, pool_->IdleSocketCountInGroup("a"));

  // Fail future jobs to be sure that handle receives the preconnected socket
  // rather than closing it and making a new one.
  connect_job_factory_->set_job_type(TestConnectJob::kMockFailingJob);
  ClientSocketHandle handle;
  TestCompletionCallback callback;
  EXPECT_EQ(OK,
            handle.Init("a", params_, DEFAULT_PRIORITY,
                        ClientSocketPool::RespectLimits::ENABLED,
                        callback.callback(), pool_.get(), NetLogWithSource()));

  ASSERT_TRUE(pool_->HasGroup("a"));
  EXPECT_EQ(0, pool_->NumConnectJobsInGroup("a"));
  EXPECT_EQ(0, pool_->NumUnassignedConnectJobsInGroup("a"));
  EXPECT_EQ(0, pool_->IdleSocketCountInGroup("a"));

  // Drain the pending read.
  EXPECT_EQ(1, handle.socket()->Read(NULL, 1, CompletionCallback()));

  TestLoadTimingInfoConnectedReused(handle);
  handle.Reset();

  // The socket should be usable now that it's idle again.
  EXPECT_EQ(1, pool_->IdleSocketCountInGroup("a"));
}

class MockLayeredPool : public HigherLayeredPool {
 public:
  MockLayeredPool(TestClientSocketPool* pool,
                  const std::string& group_name)
      : pool_(pool),
        group_name_(group_name),
        can_release_connection_(true) {
    pool_->AddHigherLayeredPool(this);
  }

  ~MockLayeredPool() {
    pool_->RemoveHigherLayeredPool(this);
  }

  int RequestSocket(TestClientSocketPool* pool) {
    scoped_refptr<TestSocketParams> params(new TestSocketParams());
    return handle_.Init(group_name_, params, DEFAULT_PRIORITY,
                        ClientSocketPool::RespectLimits::ENABLED,
                        callback_.callback(), pool, NetLogWithSource());
  }

  int RequestSocketWithoutLimits(TestClientSocketPool* pool) {
    scoped_refptr<TestSocketParams> params(new TestSocketParams());
    return handle_.Init(group_name_, params, MAXIMUM_PRIORITY,
                        ClientSocketPool::RespectLimits::DISABLED,
                        callback_.callback(), pool, NetLogWithSource());
  }

  bool ReleaseOneConnection() {
    if (!handle_.is_initialized() || !can_release_connection_) {
      return false;
    }
    handle_.socket()->Disconnect();
    handle_.Reset();
    return true;
  }

  void set_can_release_connection(bool can_release_connection) {
    can_release_connection_ = can_release_connection;
  }

  MOCK_METHOD0(CloseOneIdleConnection, bool());

 private:
  TestClientSocketPool* const pool_;
  ClientSocketHandle handle_;
  TestCompletionCallback callback_;
  const std::string group_name_;
  bool can_release_connection_;
};

TEST_F(ClientSocketPoolBaseTest, FailToCloseIdleSocketsNotHeldByLayeredPool) {
  CreatePool(kDefaultMaxSockets, kDefaultMaxSocketsPerGroup);
  connect_job_factory_->set_job_type(TestConnectJob::kMockJob);

  MockLayeredPool mock_layered_pool(pool_.get(), "foo");
  EXPECT_THAT(mock_layered_pool.RequestSocket(pool_.get()), IsOk());
  EXPECT_CALL(mock_layered_pool, CloseOneIdleConnection())
      .WillOnce(Return(false));
  EXPECT_FALSE(pool_->CloseOneIdleConnectionInHigherLayeredPool());
}

TEST_F(ClientSocketPoolBaseTest, ForciblyCloseIdleSocketsHeldByLayeredPool) {
  base::HistogramTester histograms;
  CreatePool(kDefaultMaxSockets, kDefaultMaxSocketsPerGroup);
  connect_job_factory_->set_job_type(TestConnectJob::kMockJob);

  MockLayeredPool mock_layered_pool(pool_.get(), "foo");
  EXPECT_THAT(mock_layered_pool.RequestSocket(pool_.get()), IsOk());
  EXPECT_CALL(mock_layered_pool, CloseOneIdleConnection())
      .WillOnce(Invoke(&mock_layered_pool,
                       &MockLayeredPool::ReleaseOneConnection));
  EXPECT_TRUE(pool_->CloseOneIdleConnectionInHigherLayeredPool());
  EXPECT_THAT(histograms.GetAllSamples(kIdleSocketFateHistogram),
              testing::ElementsAre(
                  base::Bucket(/*IDLE_SOCKET_FATE_RELEASE_UNUSABLE=*/3, 1)));
}

// Tests the basic case of closing an idle socket in a higher layered pool when
// a new request is issued and the lower layer pool is stalled.
TEST_F(ClientSocketPoolBaseTest, CloseIdleSocketsHeldByLayeredPoolWhenNeeded) {
  CreatePool(1, 1);
  connect_job_factory_->set_job_type(TestConnectJob::kMockJob);

  MockLayeredPool mock_layered_pool(pool_.get(), "foo");
  EXPECT_THAT(mock_layered_pool.RequestSocket(pool_.get()), IsOk());
  EXPECT_CALL(mock_layered_pool, CloseOneIdleConnection())
      .WillOnce(Invoke(&mock_layered_pool,
                       &MockLayeredPool::ReleaseOneConnection));
  ClientSocketHandle handle;
  TestCompletionCallback callback;
  EXPECT_EQ(ERR_IO_PENDING,
            handle.Init("a", params_, DEFAULT_PRIORITY,
                        ClientSocketPool::RespectLimits::ENABLED,
                        callback.callback(), pool_.get(), NetLogWithSource()));
  EXPECT_THAT(callback.WaitForResult(), IsOk());
}

// Same as above, but the idle socket is in the same group as the stalled
// socket, and closes the only other request in its group when closing requests
// in higher layered pools.  This generally shouldn't happen, but it may be
// possible if a higher level pool issues a request and the request is
// subsequently cancelled.  Even if it's not possible, best not to crash.
TEST_F(ClientSocketPoolBaseTest,
       CloseIdleSocketsHeldByLayeredPoolWhenNeededSameGroup) {
  CreatePool(2, 2);
  connect_job_factory_->set_job_type(TestConnectJob::kMockJob);

  // Need a socket in another group for the pool to be stalled (If a group
  // has the maximum number of connections already, it's not stalled).
  ClientSocketHandle handle1;
  TestCompletionCallback callback1;
  EXPECT_EQ(
      OK, handle1.Init("group1", params_, DEFAULT_PRIORITY,
                       ClientSocketPool::RespectLimits::ENABLED,
                       callback1.callback(), pool_.get(), NetLogWithSource()));

  MockLayeredPool mock_layered_pool(pool_.get(), "group2");
  EXPECT_THAT(mock_layered_pool.RequestSocket(pool_.get()), IsOk());
  EXPECT_CALL(mock_layered_pool, CloseOneIdleConnection())
      .WillOnce(Invoke(&mock_layered_pool,
                       &MockLayeredPool::ReleaseOneConnection));
  ClientSocketHandle handle;
  TestCompletionCallback callback2;
  EXPECT_EQ(ERR_IO_PENDING,
            handle.Init("group2", params_, DEFAULT_PRIORITY,
                        ClientSocketPool::RespectLimits::ENABLED,
                        callback2.callback(), pool_.get(), NetLogWithSource()));
  EXPECT_THAT(callback2.WaitForResult(), IsOk());
}

// Tests the case when an idle socket can be closed when a new request is
// issued, and the new request belongs to a group that was previously stalled.
TEST_F(ClientSocketPoolBaseTest,
       CloseIdleSocketsHeldByLayeredPoolInSameGroupWhenNeeded) {
  CreatePool(2, 2);
  std::list<TestConnectJob::JobType> job_types;
  job_types.push_back(TestConnectJob::kMockJob);
  job_types.push_back(TestConnectJob::kMockJob);
  job_types.push_back(TestConnectJob::kMockJob);
  job_types.push_back(TestConnectJob::kMockJob);
  connect_job_factory_->set_job_types(&job_types);

  ClientSocketHandle handle1;
  TestCompletionCallback callback1;
  EXPECT_EQ(
      OK, handle1.Init("group1", params_, DEFAULT_PRIORITY,
                       ClientSocketPool::RespectLimits::ENABLED,
                       callback1.callback(), pool_.get(), NetLogWithSource()));

  MockLayeredPool mock_layered_pool(pool_.get(), "group2");
  EXPECT_THAT(mock_layered_pool.RequestSocket(pool_.get()), IsOk());
  EXPECT_CALL(mock_layered_pool, CloseOneIdleConnection())
      .WillRepeatedly(Invoke(&mock_layered_pool,
                             &MockLayeredPool::ReleaseOneConnection));
  mock_layered_pool.set_can_release_connection(false);

  // The third request is made when the socket pool is in a stalled state.
  ClientSocketHandle handle3;
  TestCompletionCallback callback3;
  EXPECT_EQ(
      ERR_IO_PENDING,
      handle3.Init("group3", params_, DEFAULT_PRIORITY,
                   ClientSocketPool::RespectLimits::ENABLED,
                   callback3.callback(), pool_.get(), NetLogWithSource()));

  base::RunLoop().RunUntilIdle();
  EXPECT_FALSE(callback3.have_result());

  // The fourth request is made when the pool is no longer stalled.  The third
  // request should be serviced first, since it was issued first and has the
  // same priority.
  mock_layered_pool.set_can_release_connection(true);
  ClientSocketHandle handle4;
  TestCompletionCallback callback4;
  EXPECT_EQ(
      ERR_IO_PENDING,
      handle4.Init("group3", params_, DEFAULT_PRIORITY,
                   ClientSocketPool::RespectLimits::ENABLED,
                   callback4.callback(), pool_.get(), NetLogWithSource()));
  EXPECT_THAT(callback3.WaitForResult(), IsOk());
  EXPECT_FALSE(callback4.have_result());

  // Closing a handle should free up another socket slot.
  handle1.Reset();
  EXPECT_THAT(callback4.WaitForResult(), IsOk());
}

// Tests the case when an idle socket can be closed when a new request is
// issued, and the new request belongs to a group that was previously stalled.
//
// The two differences from the above test are that the stalled requests are not
// in the same group as the layered pool's request, and the the fourth request
// has a higher priority than the third one, so gets a socket first.
TEST_F(ClientSocketPoolBaseTest,
       CloseIdleSocketsHeldByLayeredPoolInSameGroupWhenNeeded2) {
  CreatePool(2, 2);
  std::list<TestConnectJob::JobType> job_types;
  job_types.push_back(TestConnectJob::kMockJob);
  job_types.push_back(TestConnectJob::kMockJob);
  job_types.push_back(TestConnectJob::kMockJob);
  job_types.push_back(TestConnectJob::kMockJob);
  connect_job_factory_->set_job_types(&job_types);

  ClientSocketHandle handle1;
  TestCompletionCallback callback1;
  EXPECT_EQ(
      OK, handle1.Init("group1", params_, DEFAULT_PRIORITY,
                       ClientSocketPool::RespectLimits::ENABLED,
                       callback1.callback(), pool_.get(), NetLogWithSource()));

  MockLayeredPool mock_layered_pool(pool_.get(), "group2");
  EXPECT_THAT(mock_layered_pool.RequestSocket(pool_.get()), IsOk());
  EXPECT_CALL(mock_layered_pool, CloseOneIdleConnection())
      .WillRepeatedly(Invoke(&mock_layered_pool,
                             &MockLayeredPool::ReleaseOneConnection));
  mock_layered_pool.set_can_release_connection(false);

  // The third request is made when the socket pool is in a stalled state.
  ClientSocketHandle handle3;
  TestCompletionCallback callback3;
  EXPECT_EQ(
      ERR_IO_PENDING,
      handle3.Init("group3", params_, MEDIUM,
                   ClientSocketPool::RespectLimits::ENABLED,
                   callback3.callback(), pool_.get(), NetLogWithSource()));

  base::RunLoop().RunUntilIdle();
  EXPECT_FALSE(callback3.have_result());

  // The fourth request is made when the pool is no longer stalled.  This
  // request has a higher priority than the third request, so is serviced first.
  mock_layered_pool.set_can_release_connection(true);
  ClientSocketHandle handle4;
  TestCompletionCallback callback4;
  EXPECT_EQ(
      ERR_IO_PENDING,
      handle4.Init("group3", params_, HIGHEST,
                   ClientSocketPool::RespectLimits::ENABLED,
                   callback4.callback(), pool_.get(), NetLogWithSource()));
  EXPECT_THAT(callback4.WaitForResult(), IsOk());
  EXPECT_FALSE(callback3.have_result());

  // Closing a handle should free up another socket slot.
  handle1.Reset();
  EXPECT_THAT(callback3.WaitForResult(), IsOk());
}

TEST_F(ClientSocketPoolBaseTest,
       CloseMultipleIdleSocketsHeldByLayeredPoolWhenNeeded) {
  CreatePool(1, 1);
  connect_job_factory_->set_job_type(TestConnectJob::kMockJob);

  MockLayeredPool mock_layered_pool1(pool_.get(), "foo");
  EXPECT_THAT(mock_layered_pool1.RequestSocket(pool_.get()), IsOk());
  EXPECT_CALL(mock_layered_pool1, CloseOneIdleConnection())
      .WillRepeatedly(Invoke(&mock_layered_pool1,
                             &MockLayeredPool::ReleaseOneConnection));
  MockLayeredPool mock_layered_pool2(pool_.get(), "bar");
  EXPECT_THAT(mock_layered_pool2.RequestSocketWithoutLimits(pool_.get()),
              IsOk());
  EXPECT_CALL(mock_layered_pool2, CloseOneIdleConnection())
      .WillRepeatedly(Invoke(&mock_layered_pool2,
                             &MockLayeredPool::ReleaseOneConnection));
  ClientSocketHandle handle;
  TestCompletionCallback callback;
  EXPECT_EQ(ERR_IO_PENDING,
            handle.Init("a", params_, DEFAULT_PRIORITY,
                        ClientSocketPool::RespectLimits::ENABLED,
                        callback.callback(), pool_.get(), NetLogWithSource()));
  EXPECT_THAT(callback.WaitForResult(), IsOk());
}

// Test that when a socket pool and group are at their limits, a request
// with RespectLimits::DISABLED triggers creation of a new socket, and gets the
// socket instead of a request with the same priority that was issued earlier,
// but has RespectLimits::ENABLED.
TEST_F(ClientSocketPoolBaseTest, IgnoreLimits) {
  CreatePool(1, 1);

  // Issue a request to reach the socket pool limit.
  EXPECT_EQ(
      OK, StartRequestWithIgnoreLimits(
              "a", MAXIMUM_PRIORITY, ClientSocketPool::RespectLimits::ENABLED));
  EXPECT_EQ(0, pool_->NumConnectJobsInGroup("a"));

  connect_job_factory_->set_job_type(TestConnectJob::kMockPendingJob);

  EXPECT_EQ(ERR_IO_PENDING, StartRequestWithIgnoreLimits(
                                "a", MAXIMUM_PRIORITY,
                                ClientSocketPool::RespectLimits::ENABLED));
  EXPECT_EQ(0, pool_->NumConnectJobsInGroup("a"));

  // Issue a request that ignores the limits, so a new ConnectJob is
  // created.
  EXPECT_EQ(ERR_IO_PENDING, StartRequestWithIgnoreLimits(
                                "a", MAXIMUM_PRIORITY,
                                ClientSocketPool::RespectLimits::DISABLED));
  ASSERT_EQ(1, pool_->NumConnectJobsInGroup("a"));

  EXPECT_THAT(request(2)->WaitForResult(), IsOk());
  EXPECT_FALSE(request(1)->have_result());
}

// Test that when a socket pool and group are at their limits, a ConnectJob
// issued for a request with RespectLimits::DISABLED is not cancelled when a
// request with RespectLimits::ENABLED issued to the same group is cancelled.
TEST_F(ClientSocketPoolBaseTest, IgnoreLimitsCancelOtherJob) {
  CreatePool(1, 1);

  // Issue a request to reach the socket pool limit.
  EXPECT_EQ(
      OK, StartRequestWithIgnoreLimits(
              "a", MAXIMUM_PRIORITY, ClientSocketPool::RespectLimits::ENABLED));
  EXPECT_EQ(0, pool_->NumConnectJobsInGroup("a"));

  connect_job_factory_->set_job_type(TestConnectJob::kMockPendingJob);

  EXPECT_EQ(ERR_IO_PENDING, StartRequestWithIgnoreLimits(
                                "a", MAXIMUM_PRIORITY,
                                ClientSocketPool::RespectLimits::ENABLED));
  EXPECT_EQ(0, pool_->NumConnectJobsInGroup("a"));

  // Issue a request with RespectLimits::DISABLED, so a new ConnectJob is
  // created.
  EXPECT_EQ(ERR_IO_PENDING, StartRequestWithIgnoreLimits(
                                "a", MAXIMUM_PRIORITY,
                                ClientSocketPool::RespectLimits::DISABLED));
  ASSERT_EQ(1, pool_->NumConnectJobsInGroup("a"));

  // Cancel the pending request with RespectLimits::ENABLED. The ConnectJob
  // should not be cancelled.
  request(1)->handle()->Reset();
  ASSERT_EQ(1, pool_->NumConnectJobsInGroup("a"));

  EXPECT_THAT(request(2)->WaitForResult(), IsOk());
  EXPECT_FALSE(request(1)->have_result());
}

}  // namespace

}  // namespace net