// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include <stddef.h>

#include <memory>
#include <tuple>

#include "base/functional/bind.h"
#include "base/functional/callback.h"
#include "base/memory/ptr_util.h"
#include "base/memory/raw_ptr.h"
#include "base/process/process_metrics.h"
#include "base/run_loop.h"
#include "base/strings/stringprintf.h"
#include "base/synchronization/waitable_event.h"
#include "base/task/single_thread_task_runner.h"
#include "base/test/perf_time_logger.h"
#include "base/test/task_environment.h"
#include "base/threading/thread.h"
#include "base/time/time.h"
#include "build/build_config.h"
#include "ipc/ipc_channel_mojo.h"
#include "ipc/ipc_perftest_messages.h"
#include "ipc/ipc_perftest_util.h"
#include "ipc/ipc_sync_channel.h"
#include "ipc/ipc_test.test-mojom.h"
#include "ipc/ipc_test_base.h"
#include "mojo/core/embedder/embedder.h"
#include "mojo/core/test/mojo_test_base.h"
#include "mojo/core/test/multiprocess_test_helper.h"
#include "mojo/public/cpp/bindings/associated_receiver_set.h"
#include "mojo/public/cpp/bindings/associated_remote.h"
#include "mojo/public/cpp/bindings/pending_associated_receiver.h"
#include "mojo/public/cpp/bindings/pending_receiver.h"
#include "mojo/public/cpp/bindings/pending_remote.h"
#include "mojo/public/cpp/bindings/receiver.h"
#include "mojo/public/cpp/bindings/receiver_set.h"
#include "mojo/public/cpp/bindings/remote.h"
#include "mojo/public/cpp/system/message_pipe.h"

namespace IPC {
namespace {

constexpr base::TimeDelta kLongTestTimeout = base::Seconds(80);

class PingPongTestParams {
 public:
  PingPongTestParams(size_t size, int count)
      : message_size_(size), message_count_(count) {}

  size_t message_size() const { return message_size_; }
  int message_count() const { return message_count_; }

 private:
  size_t message_size_;
  int message_count_;
};

class InterfacePassingTestParams {
 public:
  InterfacePassingTestParams(size_t rounds, size_t num_interfaces)
      : rounds_(rounds), num_interfaces_(num_interfaces) {}

  size_t rounds() const { return rounds_; }
  size_t num_interfaces() const { return num_interfaces_; }

 private:
  size_t rounds_;
  size_t num_interfaces_;
};

#ifdef NDEBUG
const int kMultiplier = 100;
#else
  // Debug builds on Windows run these tests orders of magnitude more slowly.
const int kMultiplier = 1;
#endif

std::vector<PingPongTestParams> GetDefaultTestParams() {
  // Test several sizes. We use 12^N for message size, and limit the message
  // count to keep the test duration reasonable.
  std::vector<PingPongTestParams> list;
  list.push_back(PingPongTestParams(12, 500 * kMultiplier));
  list.push_back(PingPongTestParams(144, 500 * kMultiplier));
  list.push_back(PingPongTestParams(1728, 500 * kMultiplier));
  list.push_back(PingPongTestParams(20736, 120 * kMultiplier));
  list.push_back(PingPongTestParams(248832, 10 * kMultiplier));
  return list;
}

std::vector<InterfacePassingTestParams> GetDefaultInterfacePassingTestParams() {
  std::vector<InterfacePassingTestParams> list;
  list.push_back({500 * kMultiplier, 0});
  list.push_back({500 * kMultiplier, 1});
  list.push_back({500 * kMultiplier, 2});
  list.push_back({500 * kMultiplier, 4});
  list.push_back({500 * kMultiplier, 8});
  return list;
}

class MojoInterfacePerfTest : public mojo::core::test::MojoTestBase {
 public:
  MojoInterfacePerfTest() : message_count_(0), count_down_(0) {}

  MojoInterfacePerfTest(const MojoInterfacePerfTest&) = delete;
  MojoInterfacePerfTest& operator=(const MojoInterfacePerfTest&) = delete;

 protected:
  void RunPingPongServer(MojoHandle mp, const std::string& label) {
    label_ = label;

    mojo::MessagePipeHandle mp_handle(mp);
    mojo::ScopedMessagePipeHandle scoped_mp(mp_handle);
    ping_receiver_.Bind(
        mojo::PendingRemote<IPC::mojom::Reflector>(std::move(scoped_mp), 0u));

    LockThreadAffinity thread_locker(kSharedCore);
    std::vector<PingPongTestParams> params = GetDefaultTestParams();
    for (size_t i = 0; i < params.size(); i++) {
      base::RunLoop loop;
      ping_receiver_->Ping(
          "hello",
          base::BindOnce(&MojoInterfacePerfTest::OnPong, base::Unretained(this),
                         loop.QuitWhenIdleClosure()));
      message_count_ = count_down_ = params[i].message_count();
      payload_ = std::string(params[i].message_size(), 'a');

      loop.Run();
    }

    ping_receiver_->Quit();

    std::ignore = ping_receiver_.Unbind().PassPipe().release();
  }

  void OnPong(base::OnceClosure quit_closure, const std::string& value) {
    if (value == "hello") {
      DCHECK(!perf_logger_.get());
      std::string test_name =
          base::StringPrintf("IPC_%s_Perf_%dx_%zu", label_.c_str(),
                             message_count_, payload_.size());
      perf_logger_ = std::make_unique<base::PerfTimeLogger>(test_name.c_str());
    } else {
      DCHECK_EQ(payload_.size(), value.size());

      CHECK(count_down_ > 0);
      count_down_--;
      if (count_down_ == 0) {
        perf_logger_.reset();
        if (!quit_closure.is_null()) {
          std::move(quit_closure).Run();
        }
        return;
      }
    }

    if (sync_) {
      for (int i = 0; i < count_down_; ++i) {
        std::string response;
        ping_receiver_->SyncPing(payload_, &response);
        DCHECK_EQ(response, payload_);
      }
      perf_logger_.reset();
      if (!quit_closure.is_null()) {
        std::move(quit_closure).Run();
      }
    } else {
      ping_receiver_->Ping(
          payload_,
          base::BindOnce(&MojoInterfacePerfTest::OnPong, base::Unretained(this),
                         std::move(quit_closure)));
    }
  }

  static int RunPingPongClient(MojoHandle mp) {
    mojo::MessagePipeHandle mp_handle(mp);
    mojo::ScopedMessagePipeHandle scoped_mp(mp_handle);

    LockThreadAffinity thread_locker(kSharedCore);
    // In single process mode, this is running in a task and by default other
    // tasks (in particular, the binding) won't run. To keep the single process
    // and multi-process code paths the same, enable nestable tasks.
    base::RunLoop run_loop(base::RunLoop::Type::kNestableTasksAllowed);
    ReflectorImpl impl(std::move(scoped_mp), run_loop.QuitWhenIdleClosure());
    run_loop.Run();
    return 0;
  }

  bool sync_ = false;

 private:
  int message_count_;
  int count_down_;
  std::string label_;
  std::string payload_;
  mojo::Remote<IPC::mojom::Reflector> ping_receiver_;
  std::unique_ptr<base::PerfTimeLogger> perf_logger_;
};

class InterfacePassingTestDriverImpl : public mojom::InterfacePassingTestDriver,
                                       public mojom::PingReceiver {
 public:
  InterfacePassingTestDriverImpl(mojo::ScopedMessagePipeHandle handle,
                                 base::OnceClosure quit_closure)
      : receiver_(this,
                  mojo::PendingReceiver<mojom::InterfacePassingTestDriver>(
                      std::move(handle))),
        quit_closure_(std::move(quit_closure)) {}
  ~InterfacePassingTestDriverImpl() override {
    std::ignore = receiver_.Unbind().PassPipe().release();
  }

 private:
  // mojom::InterfacePassingTestDriver implementation:
  void Init(InitCallback callback) override { std::move(callback).Run(); }

  void GetPingReceiver(
      std::vector<mojo::PendingReceiver<mojom::PingReceiver>> receivers,
      GetPingReceiverCallback callback) override {
    for (auto& receiver : receivers)
      ping_receiver_receivers_.Add(this, std::move(receiver));
    ping_receiver_receivers_.Clear();
    std::move(callback).Run();
  }

  void GetAssociatedPingReceiver(
      std::vector<mojo::PendingAssociatedReceiver<mojom::PingReceiver>>
          receivers,
      GetAssociatedPingReceiverCallback callback) override {
    for (auto& receiver : receivers)
      ping_receiver_associated_receivers_.Add(this, std::move(receiver));
    ping_receiver_associated_receivers_.Clear();
    std::move(callback).Run();
  }

  void Quit() override {
    if (!quit_closure_.is_null()) {
      std::move(quit_closure_).Run();
    }
  }

  // mojom::PingReceiver implementation:
  void Ping(PingCallback callback) override { std::move(callback).Run(); }

  mojo::ReceiverSet<mojom::PingReceiver> ping_receiver_receivers_;
  mojo::AssociatedReceiverSet<mojom::PingReceiver>
      ping_receiver_associated_receivers_;
  mojo::Receiver<mojom::InterfacePassingTestDriver> receiver_;

  base::OnceClosure quit_closure_;
};

class MojoInterfacePassingPerfTest : public mojo::core::test::MojoTestBase {
 public:
  MojoInterfacePassingPerfTest() = default;

  MojoInterfacePassingPerfTest(const MojoInterfacePassingPerfTest&) = delete;
  MojoInterfacePassingPerfTest& operator=(const MojoInterfacePassingPerfTest&) =
      delete;

 protected:
  void RunInterfacePassingServer(MojoHandle mp,
                                 const std::string& label,
                                 bool associated) {
    label_ = label;
    associated_ = associated;

    mojo::MessagePipeHandle mp_handle(mp);
    mojo::ScopedMessagePipeHandle scoped_mp(mp_handle);
    driver_remote_.Bind(mojo::PendingRemote<mojom::InterfacePassingTestDriver>(
        std::move(scoped_mp), 0u));

    auto params = GetDefaultInterfacePassingTestParams();

    LockThreadAffinity thread_locker(kSharedCore);
    for (size_t i = 0; i < params.size(); ++i) {
      driver_remote_->Init(
          base::BindOnce(&MojoInterfacePassingPerfTest::OnInitCallback,
                         base::Unretained(this)));
      rounds_ = count_down_ = params[i].rounds();
      num_interfaces_ = params[i].num_interfaces();

      base::RunLoop run_loop;
      quit_closure_ = run_loop.QuitWhenIdleClosure();
      run_loop.Run();
    }

    driver_remote_->Quit();

    std::ignore = driver_remote_.Unbind().PassPipe().release();
  }

  void OnInitCallback() {
    DCHECK(!perf_logger_.get());
    std::string test_name = base::StringPrintf(
        "IPC_%s_Perf_%zux_%zu", label_.c_str(), rounds_, num_interfaces_);
    perf_logger_ = std::make_unique<base::PerfTimeLogger>(test_name.c_str());

    DoNextRound();
  }

  void DoNextRound() {
    if (associated_) {
      std::vector<mojo::AssociatedRemote<mojom::PingReceiver>>
          associated_remotes(num_interfaces_);

      std::vector<mojo::PendingAssociatedReceiver<mojom::PingReceiver>>
          receivers(num_interfaces_);
      for (size_t i = 0; i < num_interfaces_; ++i) {
        receivers[i] = associated_remotes[i].BindNewEndpointAndPassReceiver();
        // Force the interface pointer to do full initialization.
        associated_remotes[i].get();
      }

      driver_remote_->GetAssociatedPingReceiver(
          std::move(receivers),
          base::BindOnce(&MojoInterfacePassingPerfTest::OnGetReceiverCallback,
                         base::Unretained(this)));
    } else {
      std::vector<mojo::Remote<mojom::PingReceiver>> remotes(num_interfaces_);

      std::vector<mojo::PendingReceiver<mojom::PingReceiver>> receivers(
          num_interfaces_);
      for (size_t i = 0; i < num_interfaces_; ++i) {
        receivers[i] = remotes[i].BindNewPipeAndPassReceiver();
        // Force the interface pointer to do full initialization.
        remotes[i].get();
      }

      driver_remote_->GetPingReceiver(
          std::move(receivers),
          base::BindOnce(&MojoInterfacePassingPerfTest::OnGetReceiverCallback,
                         base::Unretained(this)));
    }
  }

  void OnGetReceiverCallback() {
    CHECK_GT(count_down_, 0u);
    count_down_--;

    if (count_down_ == 0) {
      perf_logger_.reset();
      if (!quit_closure_.is_null()) {
        std::move(quit_closure_).Run();
      }
      return;
    }

    DoNextRound();
  }

  static int RunInterfacePassingClient(MojoHandle mp) {
    mojo::MessagePipeHandle mp_handle(mp);
    mojo::ScopedMessagePipeHandle scoped_mp(mp_handle);

    LockThreadAffinity thread_locker(kSharedCore);
    // In single process mode, this is running in a task and by default other
    // tasks (in particular, the binding) won't run. To keep the single process
    // and multi-process code paths the same, enable nestable tasks.
    base::RunLoop run_loop(base::RunLoop::Type::kNestableTasksAllowed);
    InterfacePassingTestDriverImpl impl(std::move(scoped_mp),
                                        run_loop.QuitWhenIdleClosure());
    run_loop.Run();
    return 0;
  }

 private:
  size_t rounds_ = 0;
  size_t count_down_ = 0;
  size_t num_interfaces_ = 0;
  std::string label_;
  bool associated_ = false;
  std::unique_ptr<base::PerfTimeLogger> perf_logger_;

  mojo::Remote<mojom::InterfacePassingTestDriver> driver_remote_;

  base::OnceClosure quit_closure_;
};

DEFINE_TEST_CLIENT_WITH_PIPE(InterfacePassingClient,
                             MojoInterfacePassingPerfTest,
                             h) {
  base::test::SingleThreadTaskEnvironment task_environment;
  base::test::ScopedRunLoopTimeout increased_timeout(FROM_HERE,
                                                     kLongTestTimeout);
  return RunInterfacePassingClient(h);
}

enum class InProcessMessageMode {
  kSerialized,
  kUnserialized,
};

template <class TestBase>
class InProcessPerfTest
    : public TestBase,
      public testing::WithParamInterface<InProcessMessageMode> {
 public:
  InProcessPerfTest() {
    switch (GetParam()) {
      case InProcessMessageMode::kSerialized:
        mojo::Connector::OverrideDefaultSerializationBehaviorForTesting(
            mojo::Connector::OutgoingSerializationMode::kEager,
            mojo::Connector::IncomingSerializationMode::kDispatchAsIs);
        break;
      case InProcessMessageMode::kUnserialized:
        mojo::Connector::OverrideDefaultSerializationBehaviorForTesting(
            mojo::Connector::OutgoingSerializationMode::kLazy,
            mojo::Connector::IncomingSerializationMode::kDispatchAsIs);
        break;
    }
  }
};

using MojoInProcessInterfacePerfTest = InProcessPerfTest<MojoInterfacePerfTest>;
using MojoInProcessInterfacePassingPerfTest =
    InProcessPerfTest<MojoInterfacePassingPerfTest>;

DEFINE_TEST_CLIENT_WITH_PIPE(PingPongClient, MojoInterfacePerfTest, h) {
  base::test::SingleThreadTaskEnvironment task_environment;
  base::test::ScopedRunLoopTimeout increased_timeout(
      FROM_HERE, TestTimeouts::action_max_timeout());
  return RunPingPongClient(h);
}

// Similar to MojoChannelPerfTest above, but uses a Mojo interface instead of
// raw IPC::Messages.
TEST_F(MojoInterfacePerfTest, MultiprocessPingPong) {
  RunTestClient("PingPongClient", [&](MojoHandle h) {
    base::test::SingleThreadTaskEnvironment task_environment;
    RunPingPongServer(h, "Multiprocess");
  });
}

TEST_F(MojoInterfacePerfTest, MultiprocessSyncPing) {
  sync_ = true;
  RunTestClient("PingPongClient", [&](MojoHandle h) {
    base::test::SingleThreadTaskEnvironment task_environment;
    RunPingPongServer(h, "MultiprocessSync");
  });
}

TEST_F(MojoInterfacePassingPerfTest, MultiprocessInterfacePassing) {
  RunTestClient("InterfacePassingClient", [&](MojoHandle h) {
    base::test::SingleThreadTaskEnvironment task_environment;
    base::test::ScopedRunLoopTimeout increased_timeout(FROM_HERE,
                                                       kLongTestTimeout);
    RunInterfacePassingServer(h, "InterfacePassing", false /* associated */);
  });
}

TEST_F(MojoInterfacePassingPerfTest, MultiprocessAssociatedInterfacePassing) {
  RunTestClient("InterfacePassingClient", [&](MojoHandle h) {
    base::test::SingleThreadTaskEnvironment task_environment;
    base::test::ScopedRunLoopTimeout increased_timeout(
        FROM_HERE, TestTimeouts::action_max_timeout());
    RunInterfacePassingServer(h, "AssociatedInterfacePassing",
                              true /* associated*/);
  });
}

// A single process version of the above test.
TEST_P(MojoInProcessInterfacePerfTest, MultiThreadPingPong) {
  MojoHandle server_handle, client_handle;
  CreateMessagePipe(&server_handle, &client_handle);

  base::Thread client_thread("PingPongClient");
  client_thread.Start();
  client_thread.task_runner()->PostTask(
      FROM_HERE,
      base::BindOnce(base::IgnoreResult(&RunPingPongClient), client_handle));

  base::test::SingleThreadTaskEnvironment task_environment;
  RunPingPongServer(server_handle, "SingleProcess");
}

TEST_P(MojoInProcessInterfacePerfTest, SingleThreadPingPong) {
  MojoHandle server_handle, client_handle;
  CreateMessagePipe(&server_handle, &client_handle);

  base::test::SingleThreadTaskEnvironment task_environment;
  mojo::MessagePipeHandle mp_handle(client_handle);
  mojo::ScopedMessagePipeHandle scoped_mp(mp_handle);
  LockThreadAffinity thread_locker(kSharedCore);
  ReflectorImpl impl(std::move(scoped_mp), base::OnceClosure());

  RunPingPongServer(server_handle, "SingleProcess");
}

INSTANTIATE_TEST_SUITE_P(All,
                         MojoInProcessInterfacePerfTest,
                         testing::Values(InProcessMessageMode::kSerialized,
                                         InProcessMessageMode::kUnserialized));

TEST_P(MojoInProcessInterfacePassingPerfTest, MultiThreadInterfacePassing) {
  MojoHandle server_handle, client_handle;
  CreateMessagePipe(&server_handle, &client_handle);

  base::Thread client_thread("InterfacePassingClient");
  client_thread.Start();
  client_thread.task_runner()->PostTask(
      FROM_HERE, base::BindOnce(base::IgnoreResult(&RunInterfacePassingClient),
                                client_handle));

  base::test::SingleThreadTaskEnvironment task_environment;
  base::test::ScopedRunLoopTimeout increased_timeout(
      FROM_HERE, TestTimeouts::action_max_timeout());
  RunInterfacePassingServer(server_handle, "SingleProcess",
                            false /* associated */);
}

TEST_P(MojoInProcessInterfacePassingPerfTest,
       MultiThreadAssociatedInterfacePassing) {
  MojoHandle server_handle, client_handle;
  CreateMessagePipe(&server_handle, &client_handle);

  base::Thread client_thread("InterfacePassingClient");
  client_thread.Start();
  client_thread.task_runner()->PostTask(
      FROM_HERE, base::BindOnce(base::IgnoreResult(&RunInterfacePassingClient),
                                client_handle));

  base::test::SingleThreadTaskEnvironment task_environment;
  base::test::ScopedRunLoopTimeout increased_timeout(
      FROM_HERE, TestTimeouts::action_max_timeout());
  RunInterfacePassingServer(server_handle, "SingleProcess",
                            true /* associated */);
}

TEST_P(MojoInProcessInterfacePassingPerfTest, SingleThreadInterfacePassing) {
  MojoHandle server_handle, client_handle;
  CreateMessagePipe(&server_handle, &client_handle);

  base::test::SingleThreadTaskEnvironment task_environment;
  base::test::ScopedRunLoopTimeout increased_timeout(
      FROM_HERE, TestTimeouts::action_max_timeout());
  mojo::MessagePipeHandle mp_handle(client_handle);
  mojo::ScopedMessagePipeHandle scoped_mp(mp_handle);
  LockThreadAffinity thread_locker(kSharedCore);
  InterfacePassingTestDriverImpl impl(std::move(scoped_mp),
                                      base::OnceClosure());

  RunInterfacePassingServer(server_handle, "SingleProcess",
                            false /* associated */);
}

TEST_P(MojoInProcessInterfacePassingPerfTest,
       SingleThreadAssociatedInterfacePassing) {
  MojoHandle server_handle, client_handle;
  CreateMessagePipe(&server_handle, &client_handle);

  base::test::SingleThreadTaskEnvironment task_environment;
  base::test::ScopedRunLoopTimeout increased_timeout(
      FROM_HERE, TestTimeouts::action_max_timeout());
  mojo::MessagePipeHandle mp_handle(client_handle);
  mojo::ScopedMessagePipeHandle scoped_mp(mp_handle);
  LockThreadAffinity thread_locker(kSharedCore);
  InterfacePassingTestDriverImpl impl(std::move(scoped_mp),
                                      base::OnceClosure());

  RunInterfacePassingServer(server_handle, "SingleProcess",
                            true /* associated */);
}

INSTANTIATE_TEST_SUITE_P(All,
                         MojoInProcessInterfacePassingPerfTest,
                         testing::Values(InProcessMessageMode::kSerialized,
                                         InProcessMessageMode::kUnserialized));

class CallbackPerfTest : public testing::Test {
 public:
  CallbackPerfTest()
      : client_thread_("PingPongClient"), message_count_(0), count_down_(0) {}

  CallbackPerfTest(const CallbackPerfTest&) = delete;
  CallbackPerfTest& operator=(const CallbackPerfTest&) = delete;

 protected:
  void RunMultiThreadPingPongServer() {
    client_thread_.Start();

    LockThreadAffinity thread_locker(kSharedCore);
    std::vector<PingPongTestParams> params = GetDefaultTestParams();
    for (size_t i = 0; i < params.size(); i++) {
      std::string hello("hello");
      base::RunLoop loop;
      client_thread_.task_runner()->PostTask(
          FROM_HERE,
          base::BindOnce(&CallbackPerfTest::Ping, base::Unretained(this), hello,
                         loop.QuitWhenIdleClosure()));
      message_count_ = count_down_ = params[i].message_count();
      payload_ = std::string(params[i].message_size(), 'a');

      loop.Run();
    }
  }

  void Ping(const std::string& value, base::OnceClosure quit_closure) {
    task_environment_.GetMainThreadTaskRunner()->PostTask(
        FROM_HERE,
        base::BindOnce(&CallbackPerfTest::OnPong, base::Unretained(this), value,
                       std::move(quit_closure)));
  }

  void OnPong(const std::string& value, base::OnceClosure quit_closure) {
    if (value == "hello") {
      DCHECK(!perf_logger_.get());
      std::string test_name =
          base::StringPrintf("Callback_MultiProcess_Perf_%dx_%zu",
                             message_count_, payload_.size());
      perf_logger_ = std::make_unique<base::PerfTimeLogger>(test_name.c_str());
    } else {
      DCHECK_EQ(payload_.size(), value.size());

      CHECK(count_down_ > 0);
      count_down_--;
      if (count_down_ == 0) {
        perf_logger_.reset();
        if (!quit_closure.is_null()) {
          std::move(quit_closure).Run();
        }
        return;
      }
    }

    client_thread_.task_runner()->PostTask(
        FROM_HERE,
        base::BindOnce(&CallbackPerfTest::Ping, base::Unretained(this),
                       payload_, std::move(quit_closure)));
  }

  void RunSingleThreadNoPostTaskPingPongServer() {
    LockThreadAffinity thread_locker(kSharedCore);
    std::vector<PingPongTestParams> params = GetDefaultTestParams();
    base::RepeatingCallback<void(
        const std::string&, int,
        base::OnceCallback<void(const std::string&, int)>)>
        ping =
            base::BindRepeating(&CallbackPerfTest::SingleThreadPingNoPostTask,
                                base::Unretained(this));
    for (size_t i = 0; i < params.size(); i++) {
      payload_ = std::string(params[i].message_size(), 'a');
      std::string test_name =
          base::StringPrintf("Callback_SingleThreadNoPostTask_Perf_%dx_%zu",
                             params[i].message_count(), payload_.size());
      perf_logger_ = std::make_unique<base::PerfTimeLogger>(test_name.c_str());
      for (int j = 0; j < params[i].message_count(); ++j) {
        ping.Run(payload_, j,
                 base::BindOnce(&CallbackPerfTest::SingleThreadPongNoPostTask,
                                base::Unretained(this)));
      }
      perf_logger_.reset();
    }
  }

  void SingleThreadPingNoPostTask(
      const std::string& value,
      int i,
      base::OnceCallback<void(const std::string&, int)> pong) {
    std::move(pong).Run(value, i);
  }

  void SingleThreadPongNoPostTask(const std::string& value, int i) {}

  void RunSingleThreadPostTaskPingPongServer() {
    LockThreadAffinity thread_locker(kSharedCore);
    std::vector<PingPongTestParams> params = GetDefaultTestParams();
    for (size_t i = 0; i < params.size(); i++) {
      std::string hello("hello");
      base::RunLoop loop;
      base::SingleThreadTaskRunner::GetCurrentDefault()->PostTask(
          FROM_HERE, base::BindOnce(&CallbackPerfTest::SingleThreadPingPostTask,
                                    base::Unretained(this), hello,
                                    loop.QuitWhenIdleClosure()));
      message_count_ = count_down_ = params[i].message_count();
      payload_ = std::string(params[i].message_size(), 'a');

      loop.Run();
    }
  }

  void SingleThreadPingPostTask(const std::string& value,
                                base::OnceClosure quit_closure) {
    base::SingleThreadTaskRunner::GetCurrentDefault()->PostTask(
        FROM_HERE,
        base::BindOnce(&CallbackPerfTest::SingleThreadPongPostTask,
                       base::Unretained(this), value, std::move(quit_closure)));
  }

  void SingleThreadPongPostTask(const std::string& value,
                                base::OnceClosure quit_closure) {
    if (value == "hello") {
      DCHECK(!perf_logger_.get());
      std::string test_name =
          base::StringPrintf("Callback_SingleThreadPostTask_Perf_%dx_%zu",
                             message_count_, payload_.size());
      perf_logger_ = std::make_unique<base::PerfTimeLogger>(test_name.c_str());
    } else {
      DCHECK_EQ(payload_.size(), value.size());

      CHECK(count_down_ > 0);
      count_down_--;
      if (count_down_ == 0) {
        perf_logger_.reset();
        if (!quit_closure.is_null()) {
          std::move(quit_closure).Run();
        }
        return;
      }
    }

    base::SingleThreadTaskRunner::GetCurrentDefault()->PostTask(
        FROM_HERE, base::BindOnce(&CallbackPerfTest::SingleThreadPingPostTask,
                                  base::Unretained(this), payload_,
                                  std::move(quit_closure)));
  }

 private:
  base::Thread client_thread_;
  base::test::SingleThreadTaskEnvironment task_environment_;
  int message_count_;
  int count_down_;
  std::string payload_;
  std::unique_ptr<base::PerfTimeLogger> perf_logger_;
};

// Sends the same data as above using PostTask to a different thread instead of
// IPCs for comparison.
TEST_F(CallbackPerfTest, MultiThreadPingPong) {
  RunMultiThreadPingPongServer();
}

// Sends the same data as above using PostTask to the same thread.
TEST_F(CallbackPerfTest, SingleThreadPostTaskPingPong) {
  RunSingleThreadPostTaskPingPongServer();
}

// Sends the same data as above without using PostTask to the same thread.
TEST_F(CallbackPerfTest, SingleThreadNoPostTaskPingPong) {
  RunSingleThreadNoPostTaskPingPongServer();
}

}  // namespace
}  // namespace IPC