text: /**
   *    Copyright (C) 2018-present MongoDB, Inc.
   *
   *    This program is free software: you can redistribute it and/or modify
   *    it under the terms of the Server Side Public License, version 1,
   *    as published by MongoDB, Inc.
   *
   *    This program is distributed in the hope that it will be useful,
   *    but WITHOUT ANY WARRANTY; without even the implied warranty of
   *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   *    Server Side Public License for more details.
   *
   *    You should have received a copy of the Server Side Public License
   *    along with this program. If not, see
   *    <http://www.mongodb.com/licensing/server-side-public-license>.
   *
   *    As a special exception, the copyright holders give permission to link the
   *    code of portions of this program with the OpenSSL library under certain
   *    conditions as described in each individual source file and distribute
   *    linked combinations including the program with the OpenSSL library. You
   *    must comply with the Server Side Public License in all respects for
   *    all of the code used other than as permitted herein. If you modify file(s)
   *    with this exception, you may extend this exception to your version of the
   *    file(s), but you are not obligated to do so. If you do not wish to do so,
   *    delete this exception statement from your version. If you delete this
   *    exception statement from all source files in the program, then also delete
   *    it in the license file.
   */
  
  #include "mongo/platform/basic.h"
  
  #include <memory>
  
  #include "mongo/db/client.h"
  #include "mongo/db/repl/rollback_checker.h"
  #include "mongo/executor/network_interface_mock.h"
  #include "mongo/executor/thread_pool_task_executor_test_fixture.h"
  #include "mongo/unittest/unittest.h"
  
  #define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kTest
  
  
  namespace {
  
  using namespace mongo;
  using namespace mongo::repl;
  using executor::NetworkInterfaceMock;
  using executor::RemoteCommandResponse;
  
  using LockGuard = stdx::lock_guard<Latch>;
  
  class RollbackCheckerTest : public executor::ThreadPoolExecutorTest {
  public:
      RollbackChecker* getRollbackChecker() const;
  
  protected:
      void setUp() override;
  
      std::unique_ptr<RollbackChecker> _rollbackChecker;
      RollbackChecker::Result _hasRolledBackResult = {ErrorCodes::NotYetInitialized, ""};
      bool _hasCalledCallback;
      mutable Mutex _mutex = MONGO_MAKE_LATCH("RollbackCheckerTest::_mutex");
  };
  
  void RollbackCheckerTest::setUp() {
      executor::ThreadPoolExecutorTest::setUp();
      launchExecutorThread();
      getNet()->enterNetwork();
      _rollbackChecker = std::make_unique<RollbackChecker>(&getExecutor(), HostAndPort());
      stdx::lock_guard<Latch> lk(_mutex);
      _hasRolledBackResult = {ErrorCodes::NotYetInitialized, ""};
      _hasCalledCallback = false;
  }
  
  RollbackChecker* RollbackCheckerTest::getRollbackChecker() const {
      return _rollbackChecker.get();
  }
  
  TEST_F(RollbackCheckerTest, InvalidConstruction) {
      HostAndPort syncSource;
  
      // Null executor.
      ASSERT_THROWS_CODE(
          RollbackChecker(nullptr, syncSource), AssertionException, ErrorCodes::BadValue);
  }
  
  TEST_F(RollbackCheckerTest, ShutdownBeforeStart) {
      auto callback = [](const RollbackChecker::Result&) {};
      shutdownExecutorThread();
      joinExecutorThread();
      ASSERT_NOT_OK(getRollbackChecker()->reset(callback).getStatus());
      ASSERT_NOT_OK(getRollbackChecker()->checkForRollback(callback).getStatus());
  }
  
  TEST_F(RollbackCheckerTest, ShutdownBeforeHasHadRollback) {
      shutdownExecutorThread();
      joinExecutorThread();
      ASSERT_EQUALS(ErrorCodes::ShutdownInProgress, getRollbackChecker()->hasHadRollback());
  }
  
  TEST_F(RollbackCheckerTest, ShutdownBeforeResetSync) {
      shutdownExecutorThread();
      joinExecutorThread();
      ASSERT_EQUALS(ErrorCodes::CallbackCanceled, getRollbackChecker()->reset_sync());
  }
  
  TEST_F(RollbackCheckerTest, reset) {
      auto callback = [](const RollbackChecker::Result&) {};
      auto cbh = unittest::assertGet(getRollbackChecker()->reset(callback));
      ASSERT(cbh);
  
      auto commandResponse = BSON("ok" << 1 << "rbid" << 3);
      getNet()->scheduleSuccessfulResponse(commandResponse);
      getNet()->runReadyNetworkOperations();
      getNet()->exitNetwork();
  
      getExecutor().wait(cbh);
      ASSERT_EQUALS(getRollbackChecker()->getBaseRBID(), 3);
  }
  
  TEST_F(RollbackCheckerTest, RollbackRBID) {
      auto callback = [this](const RollbackChecker::Result& result) {
          LockGuard lk(_mutex);
          _hasRolledBackResult = result;
          _hasCalledCallback = true;
      };
      // First set the RBID to 3.
      auto refreshCBH = unittest::assertGet(getRollbackChecker()->reset(callback));
      ASSERT(refreshCBH);
      auto commandResponse = BSON("ok" << 1 << "rbid" << 3);
      getNet()->scheduleSuccessfulResponse(commandResponse);
      getNet()->runReadyNetworkOperations();
      getExecutor().wait(refreshCBH);
      ASSERT_EQUALS(getRollbackChecker()->getBaseRBID(), 3);
      {
          LockGuard lk(_mutex);
          ASSERT_TRUE(_hasCalledCallback);
          ASSERT_TRUE(unittest::assertGet(_hasRolledBackResult));
          _hasCalledCallback = false;
      }
  
      // Check for rollback
      auto rbCBH = unittest::assertGet(getRollbackChecker()->checkForRollback(callback));
      ASSERT(rbCBH);
  
      commandResponse = BSON("ok" << 1 << "rbid" << 4);
      getNet()->scheduleSuccessfulResponse(commandResponse);
      getNet()->runReadyNetworkOperations();
      getNet()->exitNetwork();
  
      getExecutor().wait(rbCBH);
      ASSERT_EQUALS(getRollbackChecker()->getLastRBID_forTest(), 4);
      ASSERT_EQUALS(getRollbackChecker()->getBaseRBID(), 3);
      LockGuard lk(_mutex);
      ASSERT_TRUE(_hasCalledCallback);
      ASSERT_TRUE(unittest::assertGet(_hasRolledBackResult));
  }
  
  TEST_F(RollbackCheckerTest, NoRollbackRBID) {
      auto callback = [this](const RollbackChecker::Result& result) {
          LockGuard lk(_mutex);
          _hasRolledBackResult = result;
          _hasCalledCallback = true;
      };
      // First set the RBID to 3.
      auto refreshCBH = unittest::assertGet(getRollbackChecker()->reset(callback));
      ASSERT(refreshCBH);
      auto commandResponse = BSON("ok" << 1 << "rbid" << 3);
      getNet()->scheduleSuccessfulResponse(commandResponse);
      getNet()->runReadyNetworkOperations();
      getExecutor().wait(refreshCBH);
      ASSERT_EQUALS(getRollbackChecker()->getBaseRBID(), 3);
      {
          LockGuard lk(_mutex);
          ASSERT_TRUE(_hasCalledCallback);
          ASSERT_TRUE(unittest::assertGet(_hasRolledBackResult));
          _hasCalledCallback = false;
      }
  
      // Check for rollback
      auto rbCBH = unittest::assertGet(getRollbackChecker()->checkForRollback(callback));
      ASSERT(rbCBH);
  
      commandResponse = BSON("ok" << 1 << "rbid" << 3);
      getNet()->scheduleSuccessfulResponse(commandResponse);
      getNet()->runReadyNetworkOperations();
      getNet()->exitNetwork();
  
      getExecutor().wait(rbCBH);
      ASSERT_EQUALS(getRollbackChecker()->getLastRBID_forTest(), 3);
      ASSERT_EQUALS(getRollbackChecker()->getBaseRBID(), 3);
      LockGuard lk(_mutex);
      ASSERT_TRUE(_hasCalledCallback);
      ASSERT_FALSE(unittest::assertGet(_hasRolledBackResult));
  }
  }  // namespace
  