Lesson 55 - Dedicated Servers Game Mode

Source/DedicatedServers/Public/Game/DS_GameMode.h

@@ -0,0 +1,50 @@
+// Fill out your copyright notice in the Description page of Project Settings.
+
+#pragma once
+
+#include "CoreMinimal.h"
+#include "DedicatedServers/Public/GameLiftClpTypes.h"
+#include "GameFramework/GameMode.h"
+#include "DS_GameMode.generated.h"
+
+DECLARE_LOG_CATEGORY_EXTERN(LogDS_GameMode, Log, All);
+
+struct FProcessParameters;
+struct FServerParameters;
+
+struct FGameLiftConfig
+{
+	bool bIsAnywhereFleet = false;
+	bool bAllOptionsFound = false;
+	
+	int32 ServerPort = 7777;
+	
+	cmdlineparser::details::FParseResult AuthTokenResult;
+	cmdlineparser::details::FParseResult FleetIdResult;
+	cmdlineparser::details::FParseResult HostIdResult;
+	cmdlineparser::details::FParseResult WebSocketUrlResult;
+};
+
+
+UCLASS()
+class DEDICATEDSERVERS_API ADS_GameMode : public AGameMode
+{
+	GENERATED_BODY()
+	
+protected:
+	virtual void BeginPlay() override;
+	virtual void InitGame(const FString& MapName, const FString& Options, FString& ErrorMessage) override;
+
+private:
+	FGameLiftConfig GameLiftConfig;
+	FString CachedCommandLine;
+	TSharedPtr<FProcessParameters> ProcessParameters;
+	
+	static FString GetSHA256Hash(const FString& InString);
+	void InitGameLift();
+	
+	bool GetAnywhereFleetParameters(const FString& CommandLineString);
+	void LogAnywhereFleetParameters();
+	static void LogServerParameters(const FServerParameters& InServerParameters);
+	static FString GetValueOrHash(const FString& Value);
+};

Source/DedicatedServers/Public/GameLift/GameLiftClp.h

@@ -0,0 +1,30 @@
+#pragma once
+#include "GameLiftClpTypes.h"
+#include "CoreMinimal.h"
+
+struct FPortResult
+{
+	int32 Port;
+	bool bUsedDefaultPort;
+	FString WarningMessage;
+};
+
+namespace cmdlineparser
+{
+	FPortResult GetConfiguredOrDefaultPort(const FString& Token = TEXT("port="));
+	FPortResult GetConfiguredOrDefaultPort(const FString& CommandLine, const FString& Token = TEXT("port="));
+
+	details::FParseResult GetValueOfToken(const FString& CommandLine, const details::EAvailableTokens Token);
+}
+
+namespace cmdlineparser::details
+{
+	inline static constexpr int32 MIN_PORT = 1024;
+	inline static constexpr int32 MAX_PORT = 65535;
+	inline static constexpr const TCHAR* DEFAULT_PORT_TOKEN = TEXT("port=");
+		
+	FString EnsureEndsWith(const FString& Token, const TCHAR* Suffix);
+	FPortResult GetConfiguredOrDefaultPort(const FString& CommandLine, const FString& Token);
+	bool DoesRegExMatch(const FString& Text, const FString& Pattern);
+}
+

Source/DedicatedServers/Public/GameLiftClpTypes.h

@@ -0,0 +1,37 @@
+#pragma once
+
+namespace cmdlineparser::details
+{
+	enum EAvailableTokens
+	{
+		Unknown = 0,
+		AuthToken,
+		HostId,
+		FleetId,
+		WebsocketUrl,
+		MaxToken
+	};
+	
+	enum EErrorCodes
+	{
+		NoError,
+		TokenNotFound,
+		ValueEmpty,
+		FailedValidation,
+		MaxCode
+	};
+	
+	extern const TArray<FString>& ERROR_MESSAGES;
+	extern const TArray<FString>& CLI_TOKENS;
+	extern const TArray<FString>& REGEX_PATTERNS;
+	
+	struct FParseResult
+	{
+		EAvailableTokens Token = EAvailableTokens::Unknown;
+		FString Value = FString();
+		bool bIsValid = false;
+		EErrorCodes ErrorCode = EErrorCodes::TokenNotFound;
+		FString ErrorMessage = FString();
+		
+	};
+}