feat: Implemented NetworkReaderPool (#1464)

* Implement NetworkReaderPool

* Reset Position

* Debug logging removed

* SetBuffer methods internal

* Edited comment

Assets/Mirror/Components/Discovery/NetworkDiscoveryBase.cs

@@ -147,19 +147,22 @@ async Task ReceiveRequestAsync(UdpClient udpClient)
 
             UdpReceiveResult udpReceiveResult = await udpClient.ReceiveAsync();
 
-            NetworkReader reader = new NetworkReader(udpReceiveResult.Buffer);
+            NetworkReader networkReader = NetworkReaderPool.GetReader(udpReceiveResult.Buffer);
 
-            long handshake = reader.ReadInt64();
+            long handshake = networkReader.ReadInt64();
             if (handshake != secretHandshake)
             {
                 // message is not for us
+                NetworkReaderPool.Recycle(networkReader);
                 throw new ProtocolViolationException("Invalid handshake");
             }
 
             Request request = new Request();
-            request.Deserialize(reader);
+            request.Deserialize(networkReader);
 
             ProcessClientRequest(request, udpReceiveResult.RemoteEndPoint);
+
+            NetworkReaderPool.Recycle(networkReader);
         }
 
         /// <summary>
@@ -330,15 +333,20 @@ async Task ReceiveGameBroadcastAsync(UdpClient udpClient)
 
             UdpReceiveResult udpReceiveResult = await udpClient.ReceiveAsync();
 
-            NetworkReader reader = new NetworkReader(udpReceiveResult.Buffer);
+            NetworkReader networkReader = NetworkReaderPool.GetReader(udpReceiveResult.Buffer);
 
-            if (reader.ReadInt64() != secretHandshake)
+            if (networkReader.ReadInt64() != secretHandshake)
+            {
+                NetworkReaderPool.Recycle(networkReader);
                 return;
+            }
 
             Response response = new Response();
-            response.Deserialize(reader);
+            response.Deserialize(networkReader);
 
             ProcessResponse(response, udpReceiveResult.RemoteEndPoint);
+
+            NetworkReaderPool.Recycle(networkReader);
         }
 
         /// <summary>

Assets/Mirror/Components/NetworkAnimator.cs

@@ -451,7 +451,10 @@ void CmdOnAnimationServerMessage(int stateHash, float normalizedTime, int layerI
             if (LogFilter.Debug) Debug.Log("OnAnimationMessage for netId=" + netId);
 
             // handle and broadcast
-            HandleAnimMsg(stateHash, normalizedTime, layerId, new NetworkReader(parameters));
+            NetworkReader networkReader = NetworkReaderPool.GetReader(parameters);
+            HandleAnimMsg(stateHash, normalizedTime, layerId, networkReader);
+            NetworkReaderPool.Recycle(networkReader);
+
             RpcOnAnimationClientMessage(stateHash, normalizedTime, layerId, parameters);
         }
 
@@ -459,7 +462,10 @@ void CmdOnAnimationServerMessage(int stateHash, float normalizedTime, int layerI
         void CmdOnAnimationParametersServerMessage(byte[] parameters)
         {
             // handle and broadcast
-            HandleAnimParamsMsg(new NetworkReader(parameters));
+            NetworkReader networkReader = NetworkReaderPool.GetReader(parameters);
+            HandleAnimParamsMsg(networkReader);
+            NetworkReaderPool.Recycle(networkReader);
+
             RpcOnAnimationParametersClientMessage(parameters);
         }
 
@@ -486,13 +492,17 @@ void CmdOnAnimationResetTriggerServerMessage(int hash)
         [ClientRpc]
         void RpcOnAnimationClientMessage(int stateHash, float normalizedTime, int layerId, byte[] parameters)
         {
-            HandleAnimMsg(stateHash, normalizedTime, layerId, new NetworkReader(parameters));
+            NetworkReader networkReader = NetworkReaderPool.GetReader(parameters);
+            HandleAnimMsg(stateHash, normalizedTime, layerId, networkReader);
+            NetworkReaderPool.Recycle(networkReader);
         }
 
         [ClientRpc]
         void RpcOnAnimationParametersClientMessage(byte[] parameters)
         {
-            HandleAnimParamsMsg(new NetworkReader(parameters));
+            NetworkReader networkReader = NetworkReaderPool.GetReader(parameters);
+            HandleAnimParamsMsg(networkReader);
+            NetworkReaderPool.Recycle(networkReader);
         }
 
         [ClientRpc]

Assets/Mirror/Components/NetworkTransformBase.cs

@@ -252,8 +252,9 @@ public override void OnDeserialize(NetworkReader reader, bool initialState)
         void CmdClientToServerSync(byte[] payload)
         {
             // deserialize payload
-            NetworkReader reader = new NetworkReader(payload);
+            NetworkReader networkReader = NetworkReaderPool.GetReader(payload);
-            DeserializeFromReader(reader);
+            DeserializeFromReader(networkReader);
+            NetworkReaderPool.Recycle(networkReader);
 
             // server-only mode does no interpolation to save computations,
             // but let's set the position directly

Assets/Mirror/Runtime/ClientScene.cs

@@ -488,8 +488,9 @@ static void ApplySpawnPayload(NetworkIdentity identity, SpawnMessage msg)
             // (Count is 0 if there were no components)
             if (msg.payload.Count > 0)
             {
-                NetworkReader payloadReader = new NetworkReader(msg.payload);
+                NetworkReader payloadReader = NetworkReaderPool.GetReader(msg.payload);
                 identity.OnUpdateVars(payloadReader, true);
+                NetworkReaderPool.Recycle(payloadReader);
             }
 
             NetworkIdentity.spawned[msg.netId] = identity;
@@ -683,7 +684,9 @@ internal static void OnUpdateVarsMessage(UpdateVarsMessage msg)
 
             if (NetworkIdentity.spawned.TryGetValue(msg.netId, out NetworkIdentity localObject) && localObject != null)
             {
-                localObject.OnUpdateVars(new NetworkReader(msg.payload), false);
+                NetworkReader networkReader = NetworkReaderPool.GetReader(msg.payload);
+                localObject.OnUpdateVars(networkReader, false);
+                NetworkReaderPool.Recycle(networkReader);
             }
             else
             {
@@ -697,7 +700,9 @@ internal static void OnRPCMessage(RpcMessage msg)
 
             if (NetworkIdentity.spawned.TryGetValue(msg.netId, out NetworkIdentity identity))
             {
-                identity.HandleRPC(msg.componentIndex, msg.functionHash, new NetworkReader(msg.payload));
+                NetworkReader networkReader = NetworkReaderPool.GetReader(msg.payload);
+                identity.HandleRPC(msg.componentIndex, msg.functionHash, networkReader);
+                NetworkReaderPool.Recycle(networkReader);
             }
         }
 
@@ -707,7 +712,9 @@ internal static void OnSyncEventMessage(SyncEventMessage msg)
 
             if (NetworkIdentity.spawned.TryGetValue(msg.netId, out NetworkIdentity identity))
             {
-                identity.HandleSyncEvent(msg.componentIndex, msg.functionHash, new NetworkReader(msg.payload));
+                NetworkReader networkReader = NetworkReaderPool.GetReader(msg.payload);
+                identity.HandleSyncEvent(msg.componentIndex, msg.functionHash, networkReader);
+                NetworkReaderPool.Recycle(networkReader);
             }
             else
             {

Assets/Mirror/Runtime/MessagePacker.cs

@@ -89,16 +89,22 @@ public static byte[] Pack<T>(T message) where T : IMessageBase
         // unpack a message we received
         public static T Unpack<T>(byte[] data) where T : IMessageBase, new()
         {
-            NetworkReader reader = new NetworkReader(data);
+            NetworkReader networkReader = NetworkReaderPool.GetReader(data);
 
             int msgType = GetId<T>();
 
-            int id = reader.ReadUInt16();
+            int id = networkReader.ReadUInt16();
             if (id != msgType)
+            {
+                NetworkReaderPool.Recycle(networkReader);
                 throw new FormatException("Invalid message,  could not unpack " + typeof(T).FullName);
+            }
 
             T message = new T();
-            message.Deserialize(reader);
+            message.Deserialize(networkReader);
+
+            NetworkReaderPool.Recycle(networkReader);
+            
             return message;
         }
 

Assets/Mirror/Runtime/NetworkConnection.cs

@@ -325,7 +325,9 @@ public bool InvokeHandler<T>(T msg, int channelId) where T : IMessageBase
 
             MessagePacker.Pack(msg, writer);
             ArraySegment<byte> segment = writer.ToArraySegment();
-            bool result = InvokeHandler(msgType, new NetworkReader(segment), channelId);
+            NetworkReader networkReader = NetworkReaderPool.GetReader(segment);
+            bool result = InvokeHandler(msgType, networkReader, channelId);
+            NetworkReaderPool.Recycle(networkReader);
 
             // recycle writer and return
             NetworkWriterPool.Recycle(writer);
@@ -345,14 +347,14 @@ public bool InvokeHandler<T>(T msg, int channelId) where T : IMessageBase
         internal void TransportReceive(ArraySegment<byte> buffer, int channelId)
         {
             // unpack message
-            NetworkReader reader = new NetworkReader(buffer);
+            NetworkReader networkReader = NetworkReaderPool.GetReader(buffer);
-            if (MessagePacker.UnpackMessage(reader, out int msgType))
+            if (MessagePacker.UnpackMessage(networkReader, out int msgType))
             {
                 // logging
                 if (logNetworkMessages) Debug.Log("ConnectionRecv " + this + " msgType:" + msgType + " content:" + BitConverter.ToString(buffer.Array, buffer.Offset, buffer.Count));
 
                 // try to invoke the handler for that message
-                if (InvokeHandler(msgType, reader, channelId))
+                if (InvokeHandler(msgType, networkReader, channelId))
                 {
                     lastMessageTime = Time.time;
                 }
@@ -362,6 +364,8 @@ internal void TransportReceive(ArraySegment<byte> buffer, int channelId)
                 Debug.LogError("Closed connection: " + this + ". Invalid message header.");
                 Disconnect();
             }
+
+            NetworkReaderPool.Recycle(networkReader);
         }
 
         internal void AddOwnedObject(NetworkIdentity obj)

Assets/Mirror/Runtime/NetworkReader.cs

@@ -28,7 +28,6 @@ public class NetworkReader
         public int Position;
         public int Length => buffer.Count;
 
-
         public NetworkReader(byte[] bytes)
         {
             buffer = new ArraySegment<byte>(bytes);
@@ -39,6 +38,20 @@ public NetworkReader(ArraySegment<byte> segment)
             buffer = segment;
         }
 
+        // SetBuffer methods mirror constructor for ReaderPool
+        internal void SetBuffer(byte[] bytes)
+        {
+            buffer = new ArraySegment<byte>(bytes);
+            Position = 0;
+        }
+
+        internal void SetBuffer(ArraySegment<byte> segment)
+        {
+            buffer = segment;
+            Position = 0;
+        }
+
+
         public byte ReadByte()
         {
             if (Position + 1 > buffer.Count)

Assets/Mirror/Runtime/NetworkReaderPool.cs

@@ -0,0 +1,41 @@
+using System;
+using System.Collections.Generic;
+
+namespace Mirror
+{
+    public static class NetworkReaderPool
+    {
+        static readonly Stack<NetworkReader> pool = new Stack<NetworkReader>();
+
+        public static NetworkReader GetReader(byte[] bytes)
+        {
+            if (pool.Count != 0)
+            {
+                NetworkReader reader = pool.Pop();
+                // reset buffer
+                reader.SetBuffer(bytes);
+                return reader;
+            }
+
+            return new NetworkReader(bytes);
+        }
+
+        public static NetworkReader GetReader(ArraySegment<byte> segment)
+        {
+            if (pool.Count != 0)
+            {
+                NetworkReader reader = pool.Pop();
+                // reset buffer
+                reader.SetBuffer(segment);
+                return reader;
+            }
+
+            return new NetworkReader(segment);
+        }
+
+        public static void Recycle(NetworkReader reader)
+        {
+            pool.Push(reader);
+        }
+    }
+}

Assets/Mirror/Runtime/NetworkReaderPool.cs.meta

@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 2bacff63613ad634a98f9e4d15d29dbf
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Assets/Mirror/Runtime/NetworkServer.cs

@@ -1016,7 +1016,10 @@ static void OnCommandMessage(NetworkConnection conn, CommandMessage msg)
             }
 
             if (LogFilter.Debug) Debug.Log("OnCommandMessage for netId=" + msg.netId + " conn=" + conn);
-            identity.HandleCommand(msg.componentIndex, msg.functionHash, new NetworkReader(msg.payload));
+
+            NetworkReader networkReader = NetworkReaderPool.GetReader(msg.payload);
+            identity.HandleCommand(msg.componentIndex, msg.functionHash, networkReader);
+            NetworkReaderPool.Recycle(networkReader);
         }
 
         internal static void SpawnObject(GameObject obj, NetworkConnection ownerConnection)