// 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/socks_client_socket_pool.h"

#include "base/callback.h"
#include "base/compiler_specific.h"
#include "base/time/time.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/test_completion_callback.h"
#include "net/dns/mock_host_resolver.h"
#include "net/socket/client_socket_factory.h"
#include "net/socket/client_socket_handle.h"
#include "net/socket/client_socket_pool_histograms.h"
#include "net/socket/socket_test_util.h"
#include "testing/gtest/include/gtest/gtest.h"

namespace net {

namespace {

const int kMaxSockets = 32;
const int kMaxSocketsPerGroup = 6;

// Make sure |handle|'s load times are set correctly.  Only connect times should
// be set.
void TestLoadTimingInfo(const ClientSocketHandle& handle) {
  LoadTimingInfo load_timing_info;
  EXPECT_TRUE(handle.GetLoadTimingInfo(false, &load_timing_info));

  // None of these tests use a NetLog.
  EXPECT_EQ(NetLog::Source::kInvalidId, load_timing_info.socket_log_id);

  EXPECT_FALSE(load_timing_info.socket_reused);

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


scoped_refptr<TransportSocketParams> CreateProxyHostParams() {
  return new TransportSocketParams(
      HostPortPair("proxy", 80), false, false, OnHostResolutionCallback(),
      TransportSocketParams::COMBINE_CONNECT_AND_WRITE_DEFAULT);
}

scoped_refptr<SOCKSSocketParams> CreateSOCKSv4Params() {
  return new SOCKSSocketParams(
      CreateProxyHostParams(), false /* socks_v5 */,
      HostPortPair("host", 80));
}

scoped_refptr<SOCKSSocketParams> CreateSOCKSv5Params() {
  return new SOCKSSocketParams(
      CreateProxyHostParams(), true /* socks_v5 */,
      HostPortPair("host", 80));
}

class SOCKSClientSocketPoolTest : public testing::Test {
 protected:
  class SOCKS5MockData {
   public:
    explicit SOCKS5MockData(IoMode mode) {
      writes_.reset(new MockWrite[3]);
      writes_[0] = MockWrite(mode, kSOCKS5GreetRequest,
                             kSOCKS5GreetRequestLength);
      writes_[1] = MockWrite(mode, kSOCKS5OkRequest, kSOCKS5OkRequestLength);
      writes_[2] = MockWrite(mode, 0);

      reads_.reset(new MockRead[3]);
      reads_[0] = MockRead(mode, kSOCKS5GreetResponse,
                           kSOCKS5GreetResponseLength);
      reads_[1] = MockRead(mode, kSOCKS5OkResponse, kSOCKS5OkResponseLength);
      reads_[2] = MockRead(mode, 0);

      data_.reset(new StaticSocketDataProvider(reads_.get(), 3,
                                               writes_.get(), 3));
    }

    SocketDataProvider* data_provider() { return data_.get(); }

   private:
    scoped_ptr<StaticSocketDataProvider> data_;
    scoped_ptr<MockWrite[]> writes_;
    scoped_ptr<MockRead[]> reads_;
  };

  SOCKSClientSocketPoolTest()
      : transport_histograms_("MockTCP"),
        transport_socket_pool_(
            kMaxSockets, kMaxSocketsPerGroup,
            &transport_histograms_,
            &transport_client_socket_factory_),
        socks_histograms_("SOCKSUnitTest"),
        pool_(kMaxSockets, kMaxSocketsPerGroup,
              &socks_histograms_,
              &host_resolver_,
              &transport_socket_pool_,
              NULL) {
  }

  ~SOCKSClientSocketPoolTest() override {}

  int StartRequestV5(const std::string& group_name, RequestPriority priority) {
    return test_base_.StartRequestUsingPool(
        &pool_, group_name, priority, CreateSOCKSv5Params());
  }

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

  ScopedVector<TestSocketRequest>* requests() { return test_base_.requests(); }

  ClientSocketPoolHistograms transport_histograms_;
  MockClientSocketFactory transport_client_socket_factory_;
  MockTransportClientSocketPool transport_socket_pool_;

  ClientSocketPoolHistograms socks_histograms_;
  MockHostResolver host_resolver_;
  SOCKSClientSocketPool pool_;
  ClientSocketPoolTest test_base_;
};

TEST_F(SOCKSClientSocketPoolTest, Simple) {
  SOCKS5MockData data(SYNCHRONOUS);
  data.data_provider()->set_connect_data(MockConnect(SYNCHRONOUS, OK));
  transport_client_socket_factory_.AddSocketDataProvider(data.data_provider());

  ClientSocketHandle handle;
  int rv = handle.Init("a", CreateSOCKSv5Params(), LOW, CompletionCallback(),
                       &pool_, BoundNetLog());
  EXPECT_EQ(OK, rv);
  EXPECT_TRUE(handle.is_initialized());
  EXPECT_TRUE(handle.socket());
  TestLoadTimingInfo(handle);
}

// Make sure that SOCKSConnectJob passes on its priority to its
// socket request on Init.
TEST_F(SOCKSClientSocketPoolTest, SetSocketRequestPriorityOnInit) {
  for (int i = MINIMUM_PRIORITY; i <= MAXIMUM_PRIORITY; ++i) {
    RequestPriority priority = static_cast<RequestPriority>(i);
    SOCKS5MockData data(SYNCHRONOUS);
    data.data_provider()->set_connect_data(MockConnect(SYNCHRONOUS, OK));
    transport_client_socket_factory_.AddSocketDataProvider(
        data.data_provider());

    ClientSocketHandle handle;
    EXPECT_EQ(OK,
              handle.Init("a", CreateSOCKSv5Params(), priority,
                          CompletionCallback(), &pool_, BoundNetLog()));
    EXPECT_EQ(priority, transport_socket_pool_.last_request_priority());
    handle.socket()->Disconnect();
  }
}

// Make sure that SOCKSConnectJob passes on its priority to its
// HostResolver request (for non-SOCKS5) on Init.
TEST_F(SOCKSClientSocketPoolTest, SetResolvePriorityOnInit) {
  for (int i = MINIMUM_PRIORITY; i <= MAXIMUM_PRIORITY; ++i) {
    RequestPriority priority = static_cast<RequestPriority>(i);
    SOCKS5MockData data(SYNCHRONOUS);
    data.data_provider()->set_connect_data(MockConnect(SYNCHRONOUS, OK));
    transport_client_socket_factory_.AddSocketDataProvider(
        data.data_provider());

    ClientSocketHandle handle;
    EXPECT_EQ(ERR_IO_PENDING,
              handle.Init("a", CreateSOCKSv4Params(), priority,
                          CompletionCallback(), &pool_, BoundNetLog()));
    EXPECT_EQ(priority, transport_socket_pool_.last_request_priority());
    EXPECT_EQ(priority, host_resolver_.last_request_priority());
    EXPECT_TRUE(handle.socket() == NULL);
  }
}

TEST_F(SOCKSClientSocketPoolTest, Async) {
  SOCKS5MockData data(ASYNC);
  transport_client_socket_factory_.AddSocketDataProvider(data.data_provider());

  TestCompletionCallback callback;
  ClientSocketHandle handle;
  int rv = handle.Init("a", CreateSOCKSv5Params(), LOW, callback.callback(),
                       &pool_, BoundNetLog());
  EXPECT_EQ(ERR_IO_PENDING, rv);
  EXPECT_FALSE(handle.is_initialized());
  EXPECT_FALSE(handle.socket());

  EXPECT_EQ(OK, callback.WaitForResult());
  EXPECT_TRUE(handle.is_initialized());
  EXPECT_TRUE(handle.socket());
  TestLoadTimingInfo(handle);
}

TEST_F(SOCKSClientSocketPoolTest, TransportConnectError) {
  StaticSocketDataProvider socket_data;
  socket_data.set_connect_data(MockConnect(SYNCHRONOUS,
                                           ERR_CONNECTION_REFUSED));
  transport_client_socket_factory_.AddSocketDataProvider(&socket_data);

  ClientSocketHandle handle;
  int rv = handle.Init("a", CreateSOCKSv5Params(), LOW, CompletionCallback(),
                       &pool_, BoundNetLog());
  EXPECT_EQ(ERR_PROXY_CONNECTION_FAILED, rv);
  EXPECT_FALSE(handle.is_initialized());
  EXPECT_FALSE(handle.socket());
}

TEST_F(SOCKSClientSocketPoolTest, AsyncTransportConnectError) {
  StaticSocketDataProvider socket_data;
  socket_data.set_connect_data(MockConnect(ASYNC, ERR_CONNECTION_REFUSED));
  transport_client_socket_factory_.AddSocketDataProvider(&socket_data);

  TestCompletionCallback callback;
  ClientSocketHandle handle;
  int rv = handle.Init("a", CreateSOCKSv5Params(), LOW, callback.callback(),
                       &pool_, BoundNetLog());
  EXPECT_EQ(ERR_IO_PENDING, rv);
  EXPECT_FALSE(handle.is_initialized());
  EXPECT_FALSE(handle.socket());

  EXPECT_EQ(ERR_PROXY_CONNECTION_FAILED, callback.WaitForResult());
  EXPECT_FALSE(handle.is_initialized());
  EXPECT_FALSE(handle.socket());
}

TEST_F(SOCKSClientSocketPoolTest, SOCKSConnectError) {
  MockRead failed_read[] = {
    MockRead(SYNCHRONOUS, 0),
  };
  StaticSocketDataProvider socket_data(
      failed_read, arraysize(failed_read), NULL, 0);
  socket_data.set_connect_data(MockConnect(SYNCHRONOUS, OK));
  transport_client_socket_factory_.AddSocketDataProvider(&socket_data);

  ClientSocketHandle handle;
  EXPECT_EQ(0, transport_socket_pool_.release_count());
  int rv = handle.Init("a", CreateSOCKSv5Params(), LOW, CompletionCallback(),
                       &pool_, BoundNetLog());
  EXPECT_EQ(ERR_SOCKS_CONNECTION_FAILED, rv);
  EXPECT_FALSE(handle.is_initialized());
  EXPECT_FALSE(handle.socket());
  EXPECT_EQ(1, transport_socket_pool_.release_count());
}

TEST_F(SOCKSClientSocketPoolTest, AsyncSOCKSConnectError) {
  MockRead failed_read[] = {
    MockRead(ASYNC, 0),
  };
  StaticSocketDataProvider socket_data(
        failed_read, arraysize(failed_read), NULL, 0);
  socket_data.set_connect_data(MockConnect(SYNCHRONOUS, OK));
  transport_client_socket_factory_.AddSocketDataProvider(&socket_data);

  TestCompletionCallback callback;
  ClientSocketHandle handle;
  EXPECT_EQ(0, transport_socket_pool_.release_count());
  int rv = handle.Init("a", CreateSOCKSv5Params(), LOW, callback.callback(),
                       &pool_, BoundNetLog());
  EXPECT_EQ(ERR_IO_PENDING, rv);
  EXPECT_FALSE(handle.is_initialized());
  EXPECT_FALSE(handle.socket());

  EXPECT_EQ(ERR_SOCKS_CONNECTION_FAILED, callback.WaitForResult());
  EXPECT_FALSE(handle.is_initialized());
  EXPECT_FALSE(handle.socket());
  EXPECT_EQ(1, transport_socket_pool_.release_count());
}

TEST_F(SOCKSClientSocketPoolTest, CancelDuringTransportConnect) {
  SOCKS5MockData data(SYNCHRONOUS);
  transport_client_socket_factory_.AddSocketDataProvider(data.data_provider());
  // We need two connections because the pool base lets one cancelled
  // connect job proceed for potential future use.
  SOCKS5MockData data2(SYNCHRONOUS);
  transport_client_socket_factory_.AddSocketDataProvider(data2.data_provider());

  EXPECT_EQ(0, transport_socket_pool_.cancel_count());
  int rv = StartRequestV5("a", LOW);
  EXPECT_EQ(ERR_IO_PENDING, rv);

  rv = StartRequestV5("a", LOW);
  EXPECT_EQ(ERR_IO_PENDING, rv);

  pool_.CancelRequest("a", (*requests())[0]->handle());
  pool_.CancelRequest("a", (*requests())[1]->handle());
  // Requests in the connect phase don't actually get cancelled.
  EXPECT_EQ(0, transport_socket_pool_.cancel_count());

  // Now wait for the TCP sockets to connect.
  base::MessageLoop::current()->RunUntilIdle();

  EXPECT_EQ(ClientSocketPoolTest::kRequestNotFound, GetOrderOfRequest(1));
  EXPECT_EQ(ClientSocketPoolTest::kRequestNotFound, GetOrderOfRequest(2));
  EXPECT_EQ(0, transport_socket_pool_.cancel_count());
  EXPECT_EQ(2, pool_.IdleSocketCount());

  (*requests())[0]->handle()->Reset();
  (*requests())[1]->handle()->Reset();
}

TEST_F(SOCKSClientSocketPoolTest, CancelDuringSOCKSConnect) {
  SOCKS5MockData data(ASYNC);
  data.data_provider()->set_connect_data(MockConnect(SYNCHRONOUS, OK));
  transport_client_socket_factory_.AddSocketDataProvider(data.data_provider());
  // We need two connections because the pool base lets one cancelled
  // connect job proceed for potential future use.
  SOCKS5MockData data2(ASYNC);
  data2.data_provider()->set_connect_data(MockConnect(SYNCHRONOUS, OK));
  transport_client_socket_factory_.AddSocketDataProvider(data2.data_provider());

  EXPECT_EQ(0, transport_socket_pool_.cancel_count());
  EXPECT_EQ(0, transport_socket_pool_.release_count());
  int rv = StartRequestV5("a", LOW);
  EXPECT_EQ(ERR_IO_PENDING, rv);

  rv = StartRequestV5("a", LOW);
  EXPECT_EQ(ERR_IO_PENDING, rv);

  pool_.CancelRequest("a", (*requests())[0]->handle());
  pool_.CancelRequest("a", (*requests())[1]->handle());
  EXPECT_EQ(0, transport_socket_pool_.cancel_count());
  // Requests in the connect phase don't actually get cancelled.
  EXPECT_EQ(0, transport_socket_pool_.release_count());

  // Now wait for the async data to reach the SOCKS connect jobs.
  base::MessageLoop::current()->RunUntilIdle();

  EXPECT_EQ(ClientSocketPoolTest::kRequestNotFound, GetOrderOfRequest(1));
  EXPECT_EQ(ClientSocketPoolTest::kRequestNotFound, GetOrderOfRequest(2));
  EXPECT_EQ(0, transport_socket_pool_.cancel_count());
  EXPECT_EQ(0, transport_socket_pool_.release_count());
  EXPECT_EQ(2, pool_.IdleSocketCount());

  (*requests())[0]->handle()->Reset();
  (*requests())[1]->handle()->Reset();
}

// It would be nice to also test the timeouts in SOCKSClientSocketPool.

}  // namespace

}  // namespace net