Implement inter-plugin communication system + add some showcase of it

src/Zirconium/Core/Plugins/IPC/ExportedIPCMethod.cs

@@ -0,0 +1,11 @@
+using System.Collections.Generic;
+using System.Reflection;
+namespace Zirconium.Core.Plugins.IPC
+{
+    public class ExportedIPCMethod
+    {
+        public object Service { get; set; }
+        public string MethodName { get; set; }
+        public MethodInfo Method { get; set; }
+    }
+}

src/Zirconium/Core/Plugins/IPC/ExportedIPCMethodAttribute.cs

@@ -0,0 +1,13 @@
+namespace Zirconium.Core.Plugins.IPC
+{
+    [System.AttributeUsage(System.AttributeTargets.Method)]
+    public class ExportedIPCMethodAttribute : System.Attribute
+    {
+        public string MethodName { get; private set; }
+
+        public ExportedIPCMethodAttribute(string name)
+        {
+            this.MethodName = name;
+        }
+    }
+}

src/Zirconium/Core/Plugins/IPC/IPCRouter.cs

@@ -0,0 +1,53 @@
+using System.Threading.Tasks;
+using System.Linq;
+using System;
+using System.Collections.Generic;
+using Zirconium.Utils;
+
+namespace Zirconium.Core.Plugins.IPC
+{
+    public class IPCRouter
+    {
+        private IDictionary<string, IList<ExportedIPCMethod>> methodTable = new Dictionary<string, IList<ExportedIPCMethod>>();
+
+        public void RegisterIPCService(string pluginName, object service)
+        {
+            Type t = service.GetType();
+            var exportedMethods = t.GetMethods()
+                    .Where(m => m.GetCustomAttributes(typeof(ExportedIPCMethodAttribute), false).Length > 0)
+                    .ToArray();
+            foreach (var m in exportedMethods)
+            {
+                var attr = (ExportedIPCMethodAttribute)m.GetCustomAttributes(typeof(ExportedIPCMethodAttribute), false).First();
+                var exportedMethod = new ExportedIPCMethod();
+                exportedMethod.Service = service;
+                exportedMethod.MethodName = attr.MethodName;
+                exportedMethod.Method = m;
+                if (methodTable.GetValueOrDefault(pluginName, null) == null)
+                {
+                    methodTable[pluginName] = new List<ExportedIPCMethod>();
+                }
+                methodTable[pluginName].Add(exportedMethod);
+            }
+        }
+
+        public Task<dynamic> MakeRequest(string pluginName, string methodName, dynamic paramsObject)
+        {
+            return Task.Factory.StartNew<dynamic>(() =>
+            {
+                var method = methodTable[pluginName].Where(x => x.MethodName == methodName).FirstOrDefault();
+                var returnValue = method.Method.Invoke(method.Service, new object[] {paramsObject});
+                return returnValue;
+            });
+        }
+
+        public Task MakeNotif(string pluginName, string methodName, dynamic paramsObject)
+        {
+            return Task.Factory.StartNew(() =>
+            {
+                var method = methodTable[pluginName].Where(x => x.MethodName == methodName).FirstOrDefault();
+                method.Method.Invoke(method.Service, paramsObject);
+            });
+        }
+    }
+}

src/Zirconium/Core/Plugins/Interfaces/IPluginAPI.cs

@@ -7,7 +7,5 @@ namespace Zirconium.Core.Plugins.Interfaces
         void Initialize(IPluginHostAPI hostModuleAPI);
         void PreInitialize(IPluginManager pluginManager);
         string GetPluginUniqueName();
-        dynamic GetExportedAPI();
-        Type[] GetExportedTypes();
     }
 }

src/Zirconium/Core/Plugins/Interfaces/IPluginHostAPI.cs

@@ -1,3 +1,4 @@
+using System.Threading.Tasks;
 using Zirconium.Core.Models;
 
 namespace Zirconium.Core.Plugins.Interfaces
@@ -17,5 +18,8 @@ namespace Zirconium.Core.Plugins.Interfaces
         dynamic GetSettings(string pluginName);
         void ProvideAuth(IAuthProvider provider);
         IExposedSessionManager GetSessionManager();
+        void RegisterIPCService(IPluginAPI plugin, dynamic service);
+        Task<dynamic> MakeIPCRequest(string pluginName, string methodName, dynamic paramsObject);
+        Task MakeIPCNotification(string pluginName, string methodName, dynamic paramsObject);
     }
 }

src/Zirconium/Core/Plugins/Interfaces/IPluginManager.cs

@@ -2,6 +2,6 @@ namespace Zirconium.Core.Plugins.Interfaces
 {
     public interface IPluginManager
     {
-        dynamic Depends(IPluginAPI currentPlugin, string pluginName);
+        void Depends(IPluginAPI currentPlugin, string pluginName);
     }
 }

src/Zirconium/Core/Plugins/PluginHostAPI.cs

@@ -1,7 +1,10 @@
+using System;
 using System.Collections.Generic;
+using System.Threading.Tasks;
 using Newtonsoft.Json;
 using Zirconium.Core.Models;
 using Zirconium.Core.Plugins.Interfaces;
+using Zirconium.Core.Plugins.IPC;
 
 namespace Zirconium.Core.Plugins
 {
@@ -9,11 +12,13 @@ namespace Zirconium.Core.Plugins
     {
         private App _app;
         private Router _router;
+        private IPCRouter _ipcRouter;
 
         public PluginHostAPI(App app, Router router)
         {
             _router = router;
             _app = app;
+            _ipcRouter = new IPCRouter();
         }
 
         public IExposedSessionManager GetSessionManager() {
@@ -78,5 +83,18 @@ namespace Zirconium.Core.Plugins
         {
             _router.RemoveCoreEventHandler(handler.GetHandlingEventType(), handler);
         }
+
+        public void RegisterIPCService(IPluginAPI plugin, dynamic service)
+        {
+            _ipcRouter.RegisterIPCService(plugin.GetPluginUniqueName(), service);
+        }
+
+        public Task<dynamic> MakeIPCRequest(string pluginName, string methodName, dynamic paramsObject) {
+            return _ipcRouter.MakeRequest(pluginName, methodName, paramsObject);
+        }
+
+        public Task MakeIPCNotification(string pluginName, string methodName, dynamic paramsObject) {
+            return _ipcRouter.MakeNotif(pluginName, methodName, paramsObject);
+        }
     }
 }

src/Zirconium/Core/Plugins/PluginManager.cs

@@ -8,6 +8,7 @@ using McMaster.NETCore.Plugins;
 using Zirconium.Core.Logging;
 using Zirconium.Core.Models;
 using Zirconium.Core.Plugins.Interfaces;
+using Zirconium.Core.Plugins.IPC;
 using Zirconium.Utils;
 
 namespace Zirconium.Core.Plugins
@@ -73,7 +74,8 @@ namespace Zirconium.Core.Plugins
                                             typeof(IC2SMessageHandler),
                                             typeof(ICoreEventHandler),
                                             typeof(BaseMessage),
-                                            typeof(CoreEvent)
+                                            typeof(CoreEvent),
+                                            typeof(ExportedIPCMethodAttribute)
                                         },
                     config => config.PreferSharedTypes = true
                 );
@@ -92,28 +94,18 @@ namespace Zirconium.Core.Plugins
                 // This assumes the implementation of IPlugin has a parameterless constructor
                 plugin = (IPluginAPI)Activator.CreateInstance(pluginType);
                 Logging.Log.Debug($"Created plugin instance '{plugin.GetPluginUniqueName()}'.");
-                var exportedTypes = plugin.GetExportedTypes();
-                if (exportedTypes != null)
-                {
-                    foreach (var type in exportedTypes)
-                    {
-                        var path = new Uri(type.Module.Assembly.CodeBase).LocalPath;
-                        AssemblyLoadContext.Default.LoadFromAssemblyPath(path);
-                    }
-                }
                 plugin.PreInitialize(this);
                 plugin.Initialize(_pluginHostAPI);
             }
             return plugin;
         }
 
-        public dynamic Depends(IPluginAPI currentPlugin, string pluginName)
+        public void Depends(IPluginAPI currentPlugin, string pluginName)
         {
             var dependantPlugin = _plugins.GetValueOrDefault(pluginName, null);
-            if (dependantPlugin != null) return dependantPlugin.GetExportedAPI();
+            if (dependantPlugin != null) return;
             this.LoadPlugin(pluginName);
             dependantPlugin = _plugins[pluginName];
-            return dependantPlugin.GetExportedAPI();
         }
     }
 }

src/ZirconiumPlugins/MongoDB/Plugin.cs

@@ -1,8 +1,10 @@
-using System.Collections.Immutable;
+using System;
+using System.Collections.Immutable;
 using System.Collections.Generic;
 using Zirconium.Core.Plugins.Interfaces;
 using MongoDB.Driver;
 using Zirconium.Core.Logging;
+using Zirconium.Core.Plugins.IPC;
 
 namespace MongoDBPlugin
 {
@@ -10,18 +12,6 @@ namespace MongoDBPlugin
     {
         private IMongoDatabase _database;
 
-        public dynamic GetExportedAPI()
-        {
-            return _database;
-        }
-
-        public System.Type[] GetExportedTypes()
-        {
-            // var mongoCore = Assembly.Load("MongoDB.Driver.Core");
-            // var mongoBson = Assembly.Load("MongoDB.Bson");
-            return new System.Type[] {typeof(IMongoDatabase)};
-        }
-
         public string GetPluginUniqueName()
         {
             return "MongoDB";
@@ -51,8 +41,25 @@ namespace MongoDBPlugin
             var db = client.GetDatabase(database);
             Log.Info("MongoDB is connected");
             _database = db;
+            var ipcService = new IPCService(db);
+            pluginHostAPI.RegisterIPCService(this, ipcService);
         }
 
         public void PreInitialize(IPluginManager pluginManager) { }
+
+        class IPCService
+        {
+            private IMongoDatabase _db;
+
+            public IPCService(IMongoDatabase db) { _db = db; }
+
+            [ExportedIPCMethod("Insert")]
+            public void Insert(dynamic paramsObject) {
+                var colName = paramsObject.ColName;
+                var model = paramsObject.Model;
+                _db.GetCollection<dynamic>(colName).InsertOne(model);
+                Log.Debug("successfully inserted the document");
+            }
+        }
     }
 }

src/ZirconiumPlugins/TestMongoDB/Plugin.cs

@@ -1,52 +1,29 @@
-using Zirconium.Core.Plugins.Interfaces;
+using System.Dynamic;
-using MongoDB.Driver;
+using Zirconium.Core.Plugins.Interfaces;
-using Zirconium.Core.Logging;
-using System;
 
 namespace TestMongoDB
 {
     class Plugin : IPluginAPI
     {
-        private IMongoDatabase _database;
-
-        public dynamic GetExportedAPI()
-        {
-            return null;
-        }
-
-        public Type[] GetExportedTypes()
-        {
-            return null;
-        }
 
         public string GetPluginUniqueName()
         {
             return "TestMongoDB";
         }
 
-        public void Initialize(IPluginHostAPI pluginHostAPI)
+        public async void Initialize(IPluginHostAPI pluginHostAPI)
         {
             var tm = new TestModel();
             tm.ABC = "qweqowie";
-            _database.GetCollection<TestModel>("test_model").InsertOne(tm);
+            dynamic paramsObject = new ExpandoObject();
+            paramsObject.ColName = "test_model";
+            paramsObject.Model = tm;
+            await pluginHostAPI.MakeIPCRequest("MongoDB", "Insert", paramsObject);
         }
 
         public void PreInitialize(IPluginManager pluginManager)
         {
-            var db = pluginManager.Depends(this, "MongoDB");
+            pluginManager.Depends(this, "MongoDB");
-            var receivedType = db.GetType();
-            Log.Debug(db.GetType().FullName);
-            Log.Debug(db.GetType().AssemblyQualifiedName);
-            foreach (Type i in db.GetType().GetInterfaces()) {
-                Log.Debug("DB object interface: " + i.AssemblyQualifiedName);
-            }
-            Log.Debug("Type info in current assembly context:");
-            var mongoDBType = typeof(IMongoDatabase);
-            Log.Debug(mongoDBType.FullName);
-            Log.Debug(mongoDBType.AssemblyQualifiedName);
-            Log.Debug(new Uri(mongoDBType.Module.Assembly.CodeBase).LocalPath);
-            Log.Debug($"Casting compatibility: {mongoDBType.IsAssignableFrom(db.GetType())}");
-            _database = (IMongoDatabase) db;
         }
     }
 

src/ZirconiumPlugins/TestMongoDB/TestMongoDB.csproj

@@ -8,8 +8,6 @@
     <ProjectReference Include="../../Zirconium/Zirconium.csproj">
       <ExcludeAssets>runtime</ExcludeAssets>
     </ProjectReference>
-    <ProjectReference Include="../MongoDB/MongoDB.csproj"/>
-
   </ItemGroup>
 
 </Project>