MODLANG-165 Added wrapper for switch_event_bind for .net

src/mod/languages/mod_managed/managed/EventBinding.cs

+/* 
+ * FreeSWITCH Modular Media Switching Software Library / Soft-Switch Application - mod_managed
+ * Copyright (C) 2008, Michael Giagnocavo <mgg@giagnocavo.net>
+ *
+ * Version: MPL 1.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is FreeSWITCH Modular Media Switching Software Library / Soft-Switch Application - mod_managed
+ *
+ * The Initial Developer of the Original Code is
+ * Michael Giagnocavo <mgg@giagnocavo.net>
+ * Portions created by the Initial Developer are Copyright (C)
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ * 
+ * Michael Giagnocavo <mgg@giagnocavo.net>
+ * 
+ * EventBinding.cs - Helpers for switch_event_bind function
+ *
+ */
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Runtime.InteropServices;
+using System.Reflection;
+using FreeSWITCH.Native;
+
+namespace FreeSWITCH
+{
+
+    public class EventBinding : IDisposable
+    {
+
+        public class EventBindingArgs : EventArgs
+        {
+            public switch_event EventObj { get; set; }
+        }
+
+        //typedef void (*switch_event_callback_t) (switch_event_t *);
+
+        [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
+        delegate void switch_event_callback_delegate(IntPtr event_data);
+
+        readonly switch_event_callback_delegate del; // Prevent GC
+        readonly SWIGTYPE_p_f_p_switch_event__void function;
+
+        private EventBinding(SWIGTYPE_p_f_p_switch_event__void function, switch_event_callback_delegate origDelegate)
+        {
+            this.function = function;
+            this.del = origDelegate;
+        }
+        bool disposed;
+        public void Dispose()
+        {
+            dispose();
+            GC.SuppressFinalize(this);
+        }
+        void dispose()
+        {
+            if (disposed) return;
+            // HACK: FS crashes if we unbind after shutdown is pretty complete. This is still a race condition.
+            if (freeswitch.switch_core_ready() == switch_bool_t.SWITCH_FALSE) return;
+            freeswitch.switch_event_unbind_callback(this.function);
+            disposed = true;
+        }
+        ~EventBinding()
+        {
+            dispose();
+        }
+        public static switch_event SwitchEventDupe(switch_event evt)
+        {
+            IntPtr clone_ptr_ptr = Marshal.AllocCoTaskMem(IntPtr.Size);
+            freeswitch.switch_event_dup(new SWIGTYPE_p_p_switch_event(clone_ptr_ptr, false), evt);
+            IntPtr event_ptr = (IntPtr)Marshal.PtrToStructure(clone_ptr_ptr, typeof(IntPtr));
+            switch_event dupe_evt = new switch_event(event_ptr, false);
+            Marshal.FreeCoTaskMem(clone_ptr_ptr);
+            return dupe_evt;
+        }
+        public static IDisposable Bind(string id, switch_event_types_t event_types, string subclass_name, Action<EventBindingArgs> f, bool dupe)
+        {
+            switch_event_callback_delegate boundFunc;
+            if (dupe)
+            {
+                boundFunc = (eventObj) =>
+                {
+                    var args = new EventBindingArgs { EventObj = SwitchEventDupe(new switch_event(eventObj,false)) };
+                    f(args);
+                };
+            }
+            else
+            {
+                boundFunc = (eventObj) =>
+                {
+                    var args = new EventBindingArgs { EventObj = new switch_event(eventObj, false) };
+                    f(args);
+                };
+            }
+            var fp = Marshal.GetFunctionPointerForDelegate(boundFunc);
+            var swigFp = new SWIGTYPE_p_f_p_switch_event__void(fp, false);
+            var res = freeswitch.switch_event_bind(id, event_types, subclass_name, swigFp, null);
+            if (res != switch_status_t.SWITCH_STATUS_SUCCESS)
+            {
+                throw new InvalidOperationException("Call to switch_event_bind failed, result: " + res + ".");
+            }
+            return new EventBinding(swigFp, boundFunc);
+        }
+    }
+}
\ No newline at end of file

src/mod/languages/mod_managed/managed/FreeSWITCH.Managed.csproj

@@ -49,6 +49,7 @@
   <ItemGroup>
     <Compile Include="AssemblyInfo.cs" />
     <Compile Include="ChannelVariables.cs" />
+    <Compile Include="EventBinding.cs" />
     <Compile Include="ManagedSession.cs" />
     <Compile Include="Loader.cs" />
     <Compile Include="Extensions.cs" />