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为实时服务器集成游戏客户端

本主题介绍如何让您的游戏客户端做好准备，以便能够加入和参与亚马逊GameLift托管的游戏会话。

准备游戏客户端需要两组任务：

查找或创建游戏会话和玩家会话

设置您的游戏客户端以查找或启动游戏会话、请求 FlexMatch 对战以及通过创建玩家会话为游戏中的玩家预留空间。最佳做法是，创建后端服务，并在游戏客户端操作触发时使用它向亚马逊GameLift服务发出直接请求。然后，后端服务将相关响应中继回游戏客户端。

在实时服务器上连接到游戏

使您的游戏客户端能够直接连接实时服务器上的托管游戏会话，并与服务器和其他玩家交换消息。

游戏客户端示例

基本实时客户端 (C#)

此示例说明了游戏客户端与实时客户端 SDK (C#) 的基本集成。如图所示，该示例初始化 Realtime 客户端对象、设置事件处理程序并实现客户端回调、连接到 Realtime 服务器、发送消息并断开连接。

using System;
using System.Text;
using Aws.GameLift.Realtime;
using Aws.GameLift.Realtime.Event;
using Aws.GameLift.Realtime.Types;

namespace Example
{
    /**
     * An example client that wraps the GameLift Realtime client SDK
     * 
     * You can redirect logging from the SDK by setting up the LogHandler as such:
     * ClientLogger.LogHandler = (x) => Console.WriteLine(x);
     *
     */
    class RealTimeClient
    {
        public Aws.GameLift.Realtime.Client Client { get; private set; }
        
        // An opcode defined by client and your server script that represents a custom message type
        private const int MY_TEST_OP_CODE = 10;

        /// Initialize a client for GameLift Realtime and connect to a player session.
        /// <param name="endpoint">The DNS name that is assigned to Realtime server</param>
        /// <param name="remoteTcpPort">A TCP port for the Realtime server</param>
        /// <param name="listeningUdpPort">A local port for listening to UDP traffic</param>
        /// <param name="connectionType">Type of connection to establish between client and the Realtime server</param>
        /// <param name="playerSessionId">The player session ID that is assigned to the game client for a game session </param>
        /// <param name="connectionPayload">Developer-defined data to be used during client connection, such as for player authentication</param>
       public RealTimeClient(string endpoint, int remoteTcpPort, int listeningUdpPort, ConnectionType connectionType,
                    string playerSessionId, byte[] connectionPayload)
        {
            // Create a client configuration to specify a secure or unsecure connection type
            // Best practice is to set up a secure connection using the connection type RT_OVER_WSS_DTLS_TLS12.
            ClientConfiguration clientConfiguration = new ClientConfiguration()
	     {
                // C# notation to set the field ConnectionType in the new instance of ClientConfiguration
	         ConnectionType = connectionType
	     };

            // Create a Realtime client with the client configuration            
            Client = new Client(clientConfiguration);

            // Initialize event handlers for the Realtime client
            Client.ConnectionOpen += OnOpenEvent;
            Client.ConnectionClose += OnCloseEvent;
            Client.GroupMembershipUpdated += OnGroupMembershipUpdate;
            Client.DataReceived += OnDataReceived;

            // Create a connection token to authenticate the client with the Realtime server
            // Player session IDs can be retrieved using Amazon SDK for GameLift
            ConnectionToken connectionToken = new ConnectionToken(playerSessionId, connectionPayload);

            // Initiate a connection with the Realtime server with the given connection information
            Client.Connect(endpoint, remoteTcpPort, listeningUdpPort, connectionToken);
        }

        public void Disconnect()
        {
            if (Client.Connected)
            {
                Client.Disconnect();
            }
        }

        public bool IsConnected()
        {
            return Client.Connected;
        }

        /// <summary>
        /// Example of sending to a custom message to the server.
        /// 
        /// Server could be replaced by known peer Id etc.
        /// </summary>
        /// <param name="intent">Choice of delivery intent i.e. Reliable, Fast etc. </param>
        /// <param name="payload">Custom payload to send with message</param>
        public void SendMessage(DeliveryIntent intent, string payload)
        {
            Client.SendMessage(Client.NewMessage(MY_TEST_OP_CODE)
                .WithDeliveryIntent(intent)
                .WithTargetPlayer(Constants.PLAYER_ID_SERVER)
                .WithPayload(StringToBytes(payload)));
        }

        /**
         * Handle connection open events
         */
        public void OnOpenEvent(object sender, EventArgs e)
        {
        }

        /**
         * Handle connection close events
         */
        public void OnCloseEvent(object sender, EventArgs e)
        {
        }

        /**
         * Handle Group membership update events 
         */
        public void OnGroupMembershipUpdate(object sender, GroupMembershipEventArgs e)
        {
        }

        /**
         *  Handle data received from the Realtime server 
         */
        public virtual void OnDataReceived(object sender, DataReceivedEventArgs e)
        {
            switch (e.OpCode)
            {
                // handle message based on OpCode
                default:
                    break;
            }
        }

        /**
         * Helper method to simplify task of sending/receiving payloads.
         */
        public static byte[] StringToBytes(string str)
        {
            return Encoding.UTF8.GetBytes(str);
        }

        /**
         * Helper method to simplify task of sending/receiving payloads.
         */
        public static string BytesToString(byte[] bytes)
        {
            return Encoding.UTF8.GetString(bytes);
        }
    }
}