initial commit

2017-06-19 17:30:18 -04:00
commit 6e265ea24b
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+/*
+ * Copyright (C) 2012-2017 CypherCore <http://github.com/CypherCore>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+using Framework.Constants;
+using Google.Protobuf;
+using System;
+using System.Collections.Concurrent;
+using System.Collections.Generic;
+using System.Reflection;
+
+namespace Game.Services
+{
+    class ServiceManager
+    {
+        public static void Initialize()
+        {
+            Assembly currentAsm = Assembly.GetExecutingAssembly();
+            foreach (var type in currentAsm.GetTypes())
+            {
+                foreach (var methodInfo in type.GetMethods(BindingFlags.Instance | BindingFlags.NonPublic))
+                {
+                    foreach (var msgAttr in methodInfo.GetCustomAttributes<BnetServiceAttribute>())
+                    {
+                        if (msgAttr == null)
+                            continue;
+
+                        if (_clientPacketTable.ContainsKey(msgAttr.Hash) && _clientPacketTable[msgAttr.Hash].ContainsKey(msgAttr.MethodId))
+                        {
+                            //Log.outError(LogFilter.Network, "Tried to override OpcodeHandler of {0} with {1} (Opcode {2})", _clientPacketTable[msgAttr.Opcode].ToString(), methodInfo.Name, msgAttr.Opcode);
+                            continue;
+                        }
+
+                        var parameters = methodInfo.GetParameters();
+                        if (parameters.Length == 0)
+                        {
+                            Log.outError(LogFilter.Network, "Method: {0} Has no paramters", methodInfo.Name);
+                            continue;
+                        }
+
+                        if (!_clientPacketTable.ContainsKey(msgAttr.Hash))
+                            _clientPacketTable[msgAttr.Hash] = new Dictionary<uint, ServiceHandler>();
+
+                        _clientPacketTable[msgAttr.Hash][msgAttr.MethodId] = new ServiceHandler(methodInfo, parameters[0].ParameterType);
+                    }
+                }
+            }
+        }
+
+        public static ServiceHandler GetHandler(NameHash hash, uint methodId)
+        {
+            if (!_clientPacketTable.ContainsKey(hash))
+                return null;
+
+            return _clientPacketTable[hash].LookupByKey(methodId);
+        }
+
+        static ConcurrentDictionary<NameHash, Dictionary<uint, ServiceHandler>> _clientPacketTable = new ConcurrentDictionary<NameHash, Dictionary<uint, ServiceHandler>>();
+    }
+
+    public class ServiceHandler
+    {
+        public ServiceHandler(MethodInfo info, Type type)
+        {
+            methodCaller = (Func<WorldSession, IMessage, BattlenetRpcErrorCode>)GetType().GetMethod("CreateDelegate", BindingFlags.Static | BindingFlags.NonPublic).MakeGenericMethod(type).Invoke(null, new object[] { info });
+            packetType = type;
+        }
+
+        public BattlenetRpcErrorCode Invoke(WorldSession session, CodedInputStream stream)
+        {
+            var request = (IMessage)Activator.CreateInstance(packetType);
+            request.MergeFrom(stream);
+
+            return methodCaller(session, request);
+        }
+
+        static Func<WorldSession, IMessage, BattlenetRpcErrorCode> CreateDelegate<P1>(MethodInfo method) where P1 : IMessage
+        {
+            // create first delegate. It is not fine because its 
+            // signature contains unknown types T and P1
+            Func<WorldSession, P1, BattlenetRpcErrorCode> d = (Func<WorldSession, P1, BattlenetRpcErrorCode>)method.CreateDelegate(typeof(Func<WorldSession, P1, BattlenetRpcErrorCode>));
+            // create another delegate having necessary signature. 
+            // It encapsulates first delegate with a closure
+            return delegate (WorldSession target, IMessage p) { return d(target, (P1)p); };
+        }
+
+        Func<WorldSession, IMessage, BattlenetRpcErrorCode> methodCaller;
+        Type packetType;
+    }
+
+    [AttributeUsage(AttributeTargets.Method)]
+    public class BnetServiceAttribute : Attribute
+    {
+        public BnetServiceAttribute(NameHash hash, uint methodId)
+        {
+            Hash = hash;
+            MethodId = methodId;
+        }
+
+        public NameHash Hash { get; }
+        public uint MethodId { get; }
+    }
+}