[IronPython] IronPython WCF service implementation problem

[Jan R]

Hi,

I try to implement WCF services with a IronPython script. I try to implement
the services for ICalculator in the WCF get started sample tutorial, see
attachments below and
http://msdn.microsoft.com/da-dk/library/ms751519(en-us).aspx.

Unfortunately I get the follwing Exception "InvalidOperationException" with
the message:

"In order to use one of the ServiceHost constructors that takes a service
instance, the InstanceContextMode of the service must be set to
InstanceContextMode.Single.  This can be configured via the
ServiceBehaviorAttribute.  Otherwise, please consider using the ServiceHost
constructors that take a Type argument."

How do I set the appriated InstanceContextMode of the python class
implemeting the services.

Please help me out!


Regards
Jan Rouvillain

Attachments.

Program.cs:


using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.ServiceModel;

using System.ServiceModel.Description;

using IronPython;

using IronPython.Hosting;

using Microsoft.Scripting;

using Microsoft.Scripting.Hosting;

namespace Microsoft.ServiceModel.Samples

{

class Program

{

static void Main(string[] args)

{

Uri baseAddress = new Uri("http://localhost:8000/ServiceModelSamples/Service");

// Se up python implmentation

PythonRunner pyr = new PythonRunner();

pyr.loadscript(@"..\..\..\Calculator\Calculator.py");

pyr.run();

ICalculator pyCalc = (ICalculator)pyr.getInstance("PyCalculator");

ServiceHost selfHost = new ServiceHost( (object) pyCalc, baseAddress);

try

{

// Step 3 of the hosting procedure: Add a service endpoint.

selfHost.AddServiceEndpoint(

typeof(ICalculator),

new WSHttpBinding(),

"CalculatorService");

// Step 4 of the hosting procedure: Enable metadata exchange.

ServiceMetadataBehavior smb = new ServiceMetadataBehavior();

smb.HttpGetEnabled = true;

selfHost.Description.Behaviors.Add(smb);

// Step 5 of the hosting procedure: Start (and then stop) the service.

selfHost.Open();

Console.WriteLine("The service is ready.");

Console.WriteLine("Press <ENTER> to terminate service.");

Console.WriteLine();

Console.ReadLine();

// Close the ServiceHostBase to shutdown the service.

selfHost.Close();

}

catch (CommunicationException ce)

{

Console.WriteLine("An exception occurred: {0}", ce.Message);

selfHost.Abort();

}

}

}

public class PythonRunner

{

Dictionary<String, Object> options;

private ScriptEngine engine;

private ScriptScope scope;

private CompiledCode code;

public PythonRunner()

{

InitializePythonEngine();

}

public void InitializePythonEngine()

{

options = new Dictionary<string, object>();

options["DivisionOptions"] = PythonDivisionOptions.New;

engine = Python.CreateEngine(options);

}

public void loadscript(string scriptPath)

{

ScriptSource script = engine.CreateScriptSourceFromFile(scriptPath);

code = script.Compile();

scope = engine.CreateScope();

}

public void SetVariable(string name, object value)

{

scope.SetVariable( name, value);

}

public void run()

{

try

{

code.Execute(scope);

}

catch (Exception exc)

{

Console.WriteLine("Python exception: " + exc.ToString());

}

}

public Object getInstance(string className)

{

ObjectOperations ops = engine.Operations;

object obj = scope.GetVariable(className);

return (Object) ops.Call(obj);

}

}

}







CalaculatorService.cs:



using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.ServiceModel;

namespace Microsoft.ServiceModel.Samples

{

[ServiceContract(Namespace = "http://Microsoft.ServiceModel.Samples")]

public interface ICalculator

{

    // Step7: Create the method declaration for the contract.

    [OperationContract]

    double Add(double n1, double n2);



    [OperationContract]

    double Subtract(double n1, double n2);



    [OperationContract]

    double Multiply(double n1, double n2);



    [OperationContract]

    double Divide(double n1, double n2);

    }

}



Calculator.py



import clr

clr.AddReference('PlatformService')

from Microsoft.ServiceModel.Samples import ICalculator



class PyCalculator(ICalculator):

    "Implements calculator services"



    def Add(self, a, b):

        print 'a ' + a + ' + b ' + b

        return a+b

    def Subtract(self, a, b):

        print 'a ' + a + ' - b ' + b

        return a-b

    def Multiply(self, a, b):

        print 'a ' + a + ' * b ' + b

        return a*b



    def Divide(self, a, b):

        print 'a ' + a + ' // b ' + b

        return a/b
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