Mirror List Server example (#611)

feature: Mirror List Server example

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Assets/Mirror/Examples/ListServer/ListServer.cs

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+// add this component to the NetworkManager
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Text;
+using UnityEngine;
+using UnityEngine.UI;
+
+namespace Mirror.Examples.Listen
+{
+    public class ServerStatus
+    {
+        public string ip;
+        //public ushort port; // <- not all transports use a port. assume default port. feel free to also send a port if needed.
+        public string title;
+        public ushort players;
+        public ushort capacity;
+
+        public int lastLatency = -1;
+        public Ping ping;
+
+        public ServerStatus(string ip, /*ushort port,*/ string title, ushort players, ushort capacity)
+        {
+            this.ip = ip;
+            //this.port = port;
+            this.title = title;
+            this.players = players;
+            this.capacity = capacity;
+            ping = new Ping(ip);
+        }
+    }
+
+    [RequireComponent(typeof(NetworkManager))]
+    public class ListServer : MonoBehaviour
+    {
+        [Header("Listen Server Connection")]
+        public string listServerIp = "127.0.0.1";
+        public ushort gameServerToListenPort = 8887;
+        public ushort clientToListenPort = 8888;
+        public string gameServerTitle = "Deathmatch";
+
+        Telepathy.Client gameServerToListenConnection = new Telepathy.Client();
+        Telepathy.Client clientToListenConnection = new Telepathy.Client();
+
+        [Header("UI")]
+        public GameObject mainPanel;
+        public Transform content;
+        public UIServerStatusSlot slotPrefab;
+        public Button serverAndPlayButton;
+        public Button serverOnlyButton;
+        public GameObject connectingPanel;
+        public Text connectingText;
+        public Button connectingCancelButton;
+        int connectingDots = 0;
+
+        // all the servers, stored as dict with unique ip key so we can
+        // update them more easily
+        // (use "ip:port" if port is needed)
+        Dictionary<string, ServerStatus> list = new Dictionary<string, ServerStatus>();
+
+        void Start()
+        {
+            // examples
+            //list["127.0.0.1"] = new ServerStatus("127.0.0.1", "Deathmatch", 3, 10);
+            //list["192.168.0.1"] = new ServerStatus("192.168.0.1", "Free for all", 7, 10);
+            //list["172.217.22.3"] = new ServerStatus("172.217.22.3", "5vs5", 10, 10);
+            //list["172.217.16.142"] = new ServerStatus("172.217.16.142", "Hide & Seek Mod", 0, 10);
+
+            // Update once a second. no need to try to reconnect or read data
+            // in each Update call
+            // -> calling it more than 1/second would also cause significantly
+            //    more broadcasts in the list server.
+            InvokeRepeating(nameof(Tick), 0, 1);
+        }
+
+        bool IsConnecting() => NetworkClient.active && !ClientScene.ready;
+        bool FullyConnected() => NetworkClient.active && ClientScene.ready;
+
+        // should we use the client to listen connection?
+        bool UseClientToListen()
+        {
+            return !NetworkManager.IsHeadless() && !NetworkServer.active && !FullyConnected();
+        }
+
+        // should we use the game server to listen connection?
+        bool UseGameServerToListen()
+        {
+            return NetworkServer.active;
+        }
+
+        void Tick()
+        {
+            TickGameServer();
+            TickClient();
+        }
+
+        // send server status to list server
+        void SendStatus()
+        {
+            BinaryWriter writer = new BinaryWriter(new MemoryStream());
+
+            // create message
+            // NOTE: you can send anything that you want, as long as you also
+            //       receive it in ParseMessage
+            char[] titleChars = gameServerTitle.ToCharArray();
+            writer.Write((ushort)titleChars.Length);
+            writer.Write(titleChars);
+            writer.Write((ushort)NetworkServer.connections.Count);
+            writer.Write((ushort)NetworkManager.singleton.maxConnections);
+
+            // send it
+            writer.Flush();
+            gameServerToListenConnection.Send(((MemoryStream)writer.BaseStream).ToArray());
+        }
+
+        void TickGameServer()
+        {
+            // send server data to listen
+            if (UseGameServerToListen())
+            {
+                // connected yet?
+                if (gameServerToListenConnection.Connected)
+                {
+                    SendStatus();
+                }
+                // otherwise try to connect
+                // (we may have just started the game)
+                else if (!gameServerToListenConnection.Connecting)
+                {
+                    Debug.Log("Establishing game server to listen connection...");
+                    gameServerToListenConnection.Connect(listServerIp, gameServerToListenPort);
+                }
+            }
+            // shouldn't use game server, but still using it?
+            else if (gameServerToListenConnection.Connected)
+            {
+                gameServerToListenConnection.Disconnect();
+            }
+        }
+
+        void ParseMessage(byte[] bytes)
+        {
+            // use binary reader because our NetworkReader uses custom string reading with bools
+            // => we don't use ReadString here because the listen server doesn't
+            //    know C#'s '7-bit-length + utf8' encoding for strings
+            BinaryReader reader = new BinaryReader(new MemoryStream(bytes, false), Encoding.UTF8);
+            ushort ipLength = reader.ReadUInt16();
+            string ip = new string(reader.ReadChars(ipLength));
+            //ushort port = reader.ReadUInt16(); <- not all Transports use a port. assume default.
+            ushort titleLength = reader.ReadUInt16();
+            string title = new string(reader.ReadChars(titleLength));
+            ushort players = reader.ReadUInt16();
+            ushort capacity = reader.ReadUInt16();
+            //Debug.Log("PARSED: ip=" + ip + /*" port=" + port +*/ " title=" + title + " players=" + players + " capacity= " + capacity);
+
+            // build key
+            string key = ip/* + ":" + port*/;
+
+            // find existing or create new one
+            ServerStatus server;
+            if (list.TryGetValue(key, out server))
+            {
+                // refresh
+                server.title = title;
+                server.players = players;
+                server.capacity = capacity;
+            }
+            else
+            {
+                // create
+                server = new ServerStatus(ip, /*port,*/ title, players, capacity);
+            }
+
+            // save
+            list[key] = server;
+        }
+
+        void TickClient()
+        {
+            // receive client data from listen
+            if (UseClientToListen())
+            {
+                // connected yet?
+                if (clientToListenConnection.Connected)
+                {
+                    // receive latest game server info
+                    while (clientToListenConnection.GetNextMessage(out Telepathy.Message message))
+                    {
+                        // data message?
+                        if (message.eventType == Telepathy.EventType.Data)
+                            ParseMessage(message.data);
+                    }
+
+                    // ping again if previous ping finished
+                    foreach (ServerStatus server in list.Values)
+                    {
+                        if (server.ping.isDone)
+                        {
+                            server.lastLatency = server.ping.time;
+                            server.ping = new Ping(server.ip);
+                        }
+                    }
+                }
+                // otherwise try to connect
+                // (we may have just joined the menu/disconnect from game server)
+                else if (!clientToListenConnection.Connecting)
+                {
+                    Debug.Log("Establishing client to listen connection...");
+                    clientToListenConnection.Connect(listServerIp, clientToListenPort);
+                }
+            }
+            // shouldn't use client, but still using it? (e.g. after joining)
+            else if (clientToListenConnection.Connected)
+            {
+                clientToListenConnection.Disconnect();
+                list.Clear();
+            }
+
+            // refresh UI afterwards
+            OnUI();
+        }
+
+        // instantiate/remove enough prefabs to match amount
+        public static void BalancePrefabs(GameObject prefab, int amount, Transform parent)
+        {
+            // instantiate until amount
+            for (int i = parent.childCount; i < amount; ++i)
+            {
+                GameObject go = GameObject.Instantiate(prefab);
+                go.transform.SetParent(parent, false);
+            }
+
+            // delete everything that's too much
+            // (backwards loop because Destroy changes childCount)
+            for (int i = parent.childCount-1; i >= amount; --i)
+                GameObject.Destroy(parent.GetChild(i).gameObject);
+        }
+
+        void OnUI()
+        {
+            // only show while client not connected and server not started
+            if (!NetworkManager.singleton.isNetworkActive || IsConnecting())
+            {
+                mainPanel.SetActive(true);
+
+                // instantiate/destroy enough slots
+                BalancePrefabs(slotPrefab.gameObject, list.Count, content);
+
+                // refresh all members
+                for (int i = 0; i < list.Values.Count; ++i)
+                {
+                    UIServerStatusSlot slot = content.GetChild(i).GetComponent<UIServerStatusSlot>();
+                    ServerStatus server = list.Values.ToList()[i];
+                    slot.titleText.text = server.title;
+                    slot.playersText.text = server.players + "/" + server.capacity;
+                    slot.latencyText.text = server.lastLatency != -1 ? server.lastLatency.ToString() : "...";
+                    slot.addressText.text = server.ip;
+                    slot.joinButton.interactable = !IsConnecting();
+                    slot.joinButton.gameObject.SetActive(server.players < server.capacity);
+                    slot.joinButton.onClick.RemoveAllListeners();
+                    slot.joinButton.onClick.AddListener(() => {
+                        NetworkManager.singleton.networkAddress = server.ip;
+                        NetworkManager.singleton.StartClient();
+                    });
+                }
+
+                // server buttons
+                serverAndPlayButton.interactable = !IsConnecting();
+                serverAndPlayButton.onClick.RemoveAllListeners();
+                serverAndPlayButton.onClick.AddListener(() => {
+                    NetworkManager.singleton.StartHost();
+                });
+
+                serverOnlyButton.interactable = !IsConnecting();
+                serverOnlyButton.onClick.RemoveAllListeners();
+                serverOnlyButton.onClick.AddListener(() => {
+                    NetworkManager.singleton.StartServer();
+                });
+            }
+            else mainPanel.SetActive(false);
+
+            // show connecting panel while connecting
+            if (IsConnecting())
+            {
+                connectingPanel.SetActive(true);
+
+                // . => .. => ... => ....
+                connectingDots = ((connectingDots + 1) % 4);
+                connectingText.text = "Connecting" + new string('.', connectingDots);
+
+                // cancel button
+                connectingCancelButton.onClick.RemoveAllListeners();
+                connectingCancelButton.onClick.AddListener(NetworkManager.singleton.StopClient);
+            }
+            else connectingPanel.SetActive(false);
+        }
+
+        // disconnect everything when pressing Stop in the Editor
+        void OnApplicationQuit()
+        {
+            if (gameServerToListenConnection.Connected)
+                gameServerToListenConnection.Disconnect();
+            if (clientToListenConnection.Connected)
+                clientToListenConnection.Disconnect();
+        }
+    }
+}

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Assets/Mirror/Examples/ListServer/UI/ServerStatusSlot.prefab.meta

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Assets/Mirror/Examples/ListServer/UI/UIServerStatusSlot.cs

@@ -0,0 +1,13 @@
+// Attach to the prefab for easier component access by the UI Scripts.
+// Otherwise we would need slot.GetChild(0).GetComponentInChildren<Text> etc.
+using UnityEngine;
+using UnityEngine.UI;
+
+public class UIServerStatusSlot : MonoBehaviour
+{
+    public Text titleText;
+    public Text playersText;
+    public Text latencyText;
+    public Text addressText;
+    public Button joinButton;
+}

Assets/Mirror/Examples/ListServer/UI/UIServerStatusSlot.cs.meta

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