Integración de Amazon GameLift Servers en un proyecto de Unreal Engine

// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0

#pragma once

#include "CoreMinimal.h"
#include "GameFramework/GameModeBase.h"
#include "GameLiftUnrealAppGameMode.generated.h"

struct FProcessParameters;

DECLARE_LOG_CATEGORY_EXTERN(GameServerLog, Log, All);

UCLASS(minimalapi)
class AGameLiftUnrealAppGameMode : public AGameModeBase
{
    GENERATED_BODY()

public:
    AGameLiftUnrealAppGameMode();

protected:
    virtual void BeginPlay() override;

private:
    void InitGameLift();

private:
    TSharedPtr<FProcessParameters> ProcessParameters;
}; 

// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0

#include "GameLiftUnrealAppGameMode.h"

#include "UObject/ConstructorHelpers.h"
#include "Kismet/GameplayStatics.h"

#if WITH_GAMELIFT
#include "GameLiftServerSDK.h"
#include "GameLiftServerSDKModels.h"
#endif

#include "GenericPlatform/GenericPlatformOutputDevices.h"

DEFINE_LOG_CATEGORY(GameServerLog);

AGameLiftUnrealAppGameMode::AGameLiftUnrealAppGameMode() :
    ProcessParameters(nullptr)
{
    // Set default pawn class to our Blueprinted character
    static ConstructorHelpers::FClassFinder<APawn> PlayerPawnBPClass(TEXT("/Game/ThirdPerson/Blueprints/BP_ThirdPersonCharacter"));

    if (PlayerPawnBPClass.Class != NULL)
    {
        DefaultPawnClass = PlayerPawnBPClass.Class;
    }

    UE_LOG(GameServerLog, Log, TEXT("Initializing AGameLiftUnrealAppGameMode..."));
}

void AGameLiftUnrealAppGameMode::BeginPlay()
{
    Super::BeginPlay();

#if WITH_GAMELIFT
    InitGameLift();
#endif
}

void AGameLiftUnrealAppGameMode::InitGameLift()
{
#if WITH_GAMELIFT
    UE_LOG(GameServerLog, Log, TEXT("Calling InitGameLift..."));

    // Getting the module first.
    FGameLiftServerSDKModule* GameLiftSdkModule = &FModuleManager::LoadModuleChecked<FGameLiftServerSDKModule>(FName("GameLiftServerSDK"));

    //Define the server parameters for a GameLift Anywhere fleet. These are not needed for a GameLift managed EC2 fleet.
    FServerParameters ServerParametersForAnywhere;

    bool bIsAnywhereActive = false;
    if (FParse::Param(FCommandLine::Get(), TEXT("glAnywhere")))
    {
        bIsAnywhereActive = true;
    }

    if (bIsAnywhereActive)
    {
        UE_LOG(GameServerLog, Log, TEXT("Configuring server parameters for Anywhere..."));

        // If GameLift Anywhere is enabled, parse command line arguments and pass them in the ServerParameters object.
        FString glAnywhereWebSocketUrl = "";
        if (FParse::Value(FCommandLine::Get(), TEXT("glAnywhereWebSocketUrl="), glAnywhereWebSocketUrl))
        {
            ServerParametersForAnywhere.m_webSocketUrl = TCHAR_TO_UTF8(*glAnywhereWebSocketUrl);
        }

        FString glAnywhereFleetId = "";
        if (FParse::Value(FCommandLine::Get(), TEXT("glAnywhereFleetId="), glAnywhereFleetId))
        {
            ServerParametersForAnywhere.m_fleetId = TCHAR_TO_UTF8(*glAnywhereFleetId);
        }

        FString glAnywhereProcessId = "";
        if (FParse::Value(FCommandLine::Get(), TEXT("glAnywhereProcessId="), glAnywhereProcessId))
        {
            ServerParametersForAnywhere.m_processId = TCHAR_TO_UTF8(*glAnywhereProcessId);
        }
        else
        {
            // If no ProcessId is passed as a command line argument, generate a randomized unique string.
            FString TimeString = FString::FromInt(std::time(nullptr));
            FString ProcessId = "ProcessId_" + TimeString;
            ServerParametersForAnywhere.m_processId = TCHAR_TO_UTF8(*ProcessId);
        }

        FString glAnywhereHostId = "";
        if (FParse::Value(FCommandLine::Get(), TEXT("glAnywhereHostId="), glAnywhereHostId))
        {
            ServerParametersForAnywhere.m_hostId = TCHAR_TO_UTF8(*glAnywhereHostId);
        }

        FString glAnywhereAuthToken = "";
        if (FParse::Value(FCommandLine::Get(), TEXT("glAnywhereAuthToken="), glAnywhereAuthToken))
        {
            ServerParametersForAnywhere.m_authToken = TCHAR_TO_UTF8(*glAnywhereAuthToken);
        }

        FString glAnywhereAwsRegion = "";
        if (FParse::Value(FCommandLine::Get(), TEXT("glAnywhereAwsRegion="), glAnywhereAwsRegion))
        {
            ServerParametersForAnywhere.m_awsRegion = TCHAR_TO_UTF8(*glAnywhereAwsRegion);
        }

        FString glAnywhereAccessKey = "";
        if (FParse::Value(FCommandLine::Get(), TEXT("glAnywhereAccessKey="), glAnywhereAccessKey))
        {
            ServerParametersForAnywhere.m_accessKey = TCHAR_TO_UTF8(*glAnywhereAccessKey);
        }

        FString glAnywhereSecretKey = "";
        if (FParse::Value(FCommandLine::Get(), TEXT("glAnywhereSecretKey="), glAnywhereSecretKey))
        {
            ServerParametersForAnywhere.m_secretKey = TCHAR_TO_UTF8(*glAnywhereSecretKey);
        }

        FString glAnywhereSessionToken = "";
        if (FParse::Value(FCommandLine::Get(), TEXT("glAnywhereSessionToken="), glAnywhereSessionToken))
        {
            ServerParametersForAnywhere.m_sessionToken = TCHAR_TO_UTF8(*glAnywhereSessionToken);
        }

        UE_LOG(GameServerLog, SetColor, TEXT("%s"), COLOR_YELLOW);
        UE_LOG(GameServerLog, Log, TEXT(">>>> WebSocket URL: %s"), *ServerParametersForAnywhere.m_webSocketUrl);
        UE_LOG(GameServerLog, Log, TEXT(">>>> Fleet ID: %s"), *ServerParametersForAnywhere.m_fleetId);
        UE_LOG(GameServerLog, Log, TEXT(">>>> Process ID: %s"), *ServerParametersForAnywhere.m_processId);
        UE_LOG(GameServerLog, Log, TEXT(">>>> Host ID (Compute Name): %s"), *ServerParametersForAnywhere.m_hostId);
        UE_LOG(GameServerLog, Log, TEXT(">>>> Auth Token: %s"), *ServerParametersForAnywhere.m_authToken);
        UE_LOG(GameServerLog, Log, TEXT(">>>> Aws Region: %s"), *ServerParametersForAnywhere.m_awsRegion);
        UE_LOG(GameServerLog, Log, TEXT(">>>> Access Key: %s"), *ServerParametersForAnywhere.m_accessKey);
        UE_LOG(GameServerLog, Log, TEXT(">>>> Secret Key: %s"), *ServerParametersForAnywhere.m_secretKey);
        UE_LOG(GameServerLog, Log, TEXT(">>>> Session Token: %s"), *ServerParametersForAnywhere.m_sessionToken);
        UE_LOG(GameServerLog, SetColor, TEXT("%s"), COLOR_NONE);
    }

    UE_LOG(GameServerLog, Log, TEXT("Initializing the GameLift Server..."));

    //InitSDK will establish a local connection with GameLift's agent to enable further communication.
    FGameLiftGenericOutcome InitSdkOutcome = GameLiftSdkModule->InitSDK(ServerParametersForAnywhere);
    if (InitSdkOutcome.IsSuccess())
    {
        UE_LOG(GameServerLog, SetColor, TEXT("%s"), COLOR_GREEN);
        UE_LOG(GameServerLog, Log, TEXT("GameLift InitSDK succeeded!"));
        UE_LOG(GameServerLog, SetColor, TEXT("%s"), COLOR_NONE);
    }
    else
    {
        UE_LOG(GameServerLog, SetColor, TEXT("%s"), COLOR_RED);
        UE_LOG(GameServerLog, Log, TEXT("ERROR: InitSDK failed : ("));
        FGameLiftError GameLiftError = InitSdkOutcome.GetError();
        UE_LOG(GameServerLog, Log, TEXT("ERROR: %s"), *GameLiftError.m_errorMessage);
        UE_LOG(GameServerLog, SetColor, TEXT("%s"), COLOR_NONE);
        return;
    }

    ProcessParameters = MakeShared<FProcessParameters>();

    //When a game session is created, Amazon GameLift Servers sends an activation request to the game server and passes along the game session object containing game properties and other settings.
    //Here is where a game server should take action based on the game session object.
    //Once the game server is ready to receive incoming player connections, it should invoke GameLiftServerAPI.ActivateGameSession()
    ProcessParameters->OnStartGameSession.BindLambda([=](Aws::GameLift::Server::Model::GameSession InGameSession)
        {
            FString GameSessionId = FString(InGameSession.GetGameSessionId());
            UE_LOG(GameServerLog, Log, TEXT("GameSession Initializing: %s"), *GameSessionId);
            GameLiftSdkModule->ActivateGameSession();
        });

    //OnProcessTerminate callback. Amazon GameLift Servers will invoke this callback before shutting down an instance hosting this game server.
    //It gives this game server a chance to save its state, communicate with services, etc., before being shut down.
    //In this case, we simply tell Amazon GameLift Servers we are indeed going to shutdown.
    ProcessParameters->OnTerminate.BindLambda([=]()
        {
            UE_LOG(GameServerLog, Log, TEXT("Game Server Process is terminating"));
            // First call ProcessEnding()
            FGameLiftGenericOutcome processEndingOutcome = GameLiftSdkModule->ProcessEnding();
            // Then call Destroy() to free the SDK from memory
            FGameLiftGenericOutcome destroyOutcome = GameLiftSdkModule->Destroy();
            // Exit the process with success or failure
            if (processEndingOutcome.IsSuccess() && destroyOutcome.IsSuccess()) {
                UE_LOG(GameServerLog, Log, TEXT("Server process ending successfully"));
            }
            else {
                if (!processEndingOutcome.IsSuccess()) {
                    const FGameLiftError& error = processEndingOutcome.GetError();
                    UE_LOG(GameServerLog, Error, TEXT("ProcessEnding() failed. Error: %s"),
                    error.m_errorMessage.IsEmpty() ? TEXT("Unknown error") : *error.m_errorMessage);
                }
                if (!destroyOutcome.IsSuccess()) {
                    const FGameLiftError& error = destroyOutcome.GetError();
                    UE_LOG(GameServerLog, Error, TEXT("Destroy() failed. Error: %s"),
                    error.m_errorMessage.IsEmpty() ? TEXT("Unknown error") : *error.m_errorMessage);
                }
            }
        });
         
    //This is the HealthCheck callback.
    //Amazon GameLift Servers will invoke this callback every 60 seconds or so.
    //Here, a game server might want to check the health of dependencies and such.
    //Simply return true if healthy, false otherwise.
    //The game server has 60 seconds to respond with its health status. Amazon GameLift Servers will default to 'false' if the game server doesn't respond in time.
    //In this case, we're always healthy!
    ProcessParameters->OnHealthCheck.BindLambda([]()
        {
            UE_LOG(GameServerLog, Log, TEXT("Performing Health Check"));
            return true;
        });

    //GameServer.exe -port=7777 LOG=server.mylog
    ProcessParameters->port = FURL::UrlConfig.DefaultPort;
    TArray<FString> CommandLineTokens;
    TArray<FString> CommandLineSwitches;

    FCommandLine::Parse(FCommandLine::Get(), CommandLineTokens, CommandLineSwitches);

    for (FString SwitchStr : CommandLineSwitches)
    {
        FString Key;
        FString Value;

        if (SwitchStr.Split("=", &Key, &Value))
        {
            if (Key.Equals("port"))
            {
                ProcessParameters->port = FCString::Atoi(*Value);
            }
        }
    }

    //Here, the game server tells Amazon GameLift Servers where to find game session log files.
    //At the end of a game session, Amazon GameLift Servers uploads everything in the specified 
    //location and stores it in the cloud for access later.
    TArray<FString> Logfiles;
    Logfiles.Add(TEXT("GameLiftUnrealApp/Saved/Logs/server.log"));
    ProcessParameters->logParameters = Logfiles;

    //The game server calls ProcessReady() to tell Amazon GameLift Servers it's ready to host game sessions.
    UE_LOG(GameServerLog, Log, TEXT("Calling Process Ready..."));
    FGameLiftGenericOutcome ProcessReadyOutcome = GameLiftSdkModule->ProcessReady(*ProcessParameters);

    if (ProcessReadyOutcome.IsSuccess())
    {
        UE_LOG(GameServerLog, SetColor, TEXT("%s"), COLOR_GREEN);
        UE_LOG(GameServerLog, Log, TEXT("Process Ready!"));
        UE_LOG(GameServerLog, SetColor, TEXT("%s"), COLOR_NONE);
    }
    else
    {
        UE_LOG(GameServerLog, SetColor, TEXT("%s"), COLOR_RED);
        UE_LOG(GameServerLog, Log, TEXT("ERROR: Process Ready Failed!"));
        FGameLiftError ProcessReadyError = ProcessReadyOutcome.GetError();
        UE_LOG(GameServerLog, Log, TEXT("ERROR: %s"), *ProcessReadyError.m_errorMessage);
        UE_LOG(GameServerLog, SetColor, TEXT("%s"), COLOR_NONE);
    }

    UE_LOG(GameServerLog, Log, TEXT("InitGameLift completed!"));
#endif
} 

Debe incluir la misma versión de las bibliotecas de OpenSSL que se usaron al empaquetar el servidor de juegos en Unreal. Estas bibliotecas se encuentran en el origen del motor de juegos. La ubicación varía en función del entorno de desarrollo:

En Windows:

En Linux:

Copie las bibliotecas de OpenSSL en el paquete de compilación del juego, en el mismo directorio que el archivo ejecutable del servidor de juegos.