[Mono-list] Remoting + interface parameter names = a bug ?

[Lluis Sanchez]

This is a very complete bug report. If you can file it in
bugzilla.ximian.com it would be perfect.

Thanks!

On dv, 2004-06-18 at 15:52, Yuri Leikind wrote:
> Hello all,
> 
> Looks like I have found an astonishing thing:
> 
> If I have a server that exposes some type via remoting, and 
> this type implements an interface with the help of which
> the type is accessed in the remoting client, the parameter names
> in interface methods declarations influence runtime. 
> 
> In other words, if the parameters names are not the same,
> the call to the remote object will raise an exception.
> 
> Here is the code for you to believe me:
> 
> ==========     IFactorial.cs   ==========
> 
> namespace ProofOfConcepts{
>     public interface IFactorial{
>         //ulong CalculateFactorial(uint a);  // With this line everything  works
>         ulong CalculateFactorial(uint b);    // With this line it doesn't
>     }
> }
> 
> 
> ==========     Server.cs   ==========
> using System;
> using System.Runtime.Remoting;
> using System.Runtime.Remoting.Channels;
> using System.Runtime.Remoting.Channels.Http;
> 
> namespace ProofOfConcepts{
>     
>     public class Calculator : MarshalByRefObject, IFactorial{
>         public ulong CalculateFactorial(uint a){
>             ulong res = 1;
>             for (uint i=1 ; i<=a; i++)
>                 res = res * i;
>             Console.WriteLine("!{0} = {1}", a, res);
>             return res;
>         }
>     }
>     
>     class Server{
>         public Server(){
>             HttpChannel channel = new HttpChannel(60000);
>             ChannelServices.RegisterChannel(channel);
>             Type facType = Type.GetType("ProofOfConcepts.Calculator");
>             RemotingConfiguration.RegisterWellKnownServiceType(
>                 facType,
>                 "MyEndPoint",
>                 WellKnownObjectMode.Singleton );            
>         }
>         
>         void Listen(){
>             Console.WriteLine("Press Enter to exit...");
>             Console.ReadLine( );
>         }
>         
>         public static void Main(){
>             new Server().Listen();
>         }
>     }
> 
> }
> 
> ==========     Client.cs   ==========
> 
> using System;
> using System.Runtime.Remoting;
> using System.Runtime.Remoting.Channels;
> using System.Runtime.Remoting.Channels.Http;
> 
> 
> namespace ProofOfConcepts{
>     class Client{
>         public static void Main(){
>             HttpChannel channel = new HttpChannel(0);
>             ChannelServices.RegisterChannel(channel);
>             MarshalByRefObject obj = 
>                 (MarshalByRefObject) RemotingServices.Connect(
>                     typeof(ProofOfConcepts.IFactorial),
>                     "http://localhost:60000/MyEndPoint");
>             IFactorial cal = (IFactorial) obj;
>             Console.WriteLine("!4 = {0}", cal.CalculateFactorial(4));
>         }
>     }
> }
> 
> ==============================
> 
> To compile these, issue the following commands:
> 
> mcs   /t:library /out:IFactorial.dll IFactorial.cs
> 
> mcs  /r:IFactorial.dll,System.Runtime.Remoting.dll  /out:Server.exe Server.cs
> 
> mcs  /r:IFactorial.dll,System.Runtime.Remoting.dll  /out:Client.exe Client.cs
> 
> 
> Now run the server, then start the client.
> 
> I get the following in the Client.exe console::
> 
> ===============================
> 
> leikind@pc324:~/cs/appDomains/my_remoting$ mono Client.exe 
> 
> Unhandled Exception: System.IndexOutOfRangeException: Array index is out of range.
> 
> Server stack trace: 
> in <0x005ea> System.Runtime.Remoting.Channels.SoapMessageFormatter:BuildMethodCallFromSoapMessage (System.Runtime.Serialization.Formatters.SoapMessage,string)
> in <0x001f5> System.Runtime.Remoting.Channels.SoapServerFormatterSink:ProcessMessage (System.Runtime.Remoting.Channels.IServerChannelSinkStack,System.Runtime.Remoting.Messaging.IMessage,System.Runtime.Remoting.Channels.ITransportHeaders,System.IO.Stream,System.Runtime.Remoting.Messaging.IMessage&,System.Runtime.Remoting.Channels.ITransportHeaders&,System.IO.Stream&)
> 
> 
> Exception rethrown at [0]: 
> 
> in <0x00748> System.Runtime.Remoting.Proxies.RealProxy:PrivateInvoke (System.Runtime.Remoting.Proxies.RealProxy,System.Runtime.Remoting.Messaging.IMessage,System.Exception&,object[]&)
> 
> ===============================
> 
> If you cache in the interface  line 
> 	ulong CalculateFactorial(uint b);  
> to
> 	ulong CalculateFactorial(uint a);  
> recompile all the three assemblies, and run again, everything will work just fine.
> 
> I run Mono 0.95
> 
> On MS .NET it works fine in all cases
> 
> Does anyone have any comments?