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C# - WCF Service, Callbacks and Channel Factory

post #1 of 11
Thread Starter 
Heya!

I need my WCF service to raise events to the clients. I've read that that happens through callback channel, and I've implemented it in the following manner:

Service interfaces:
Code:
    public interface IServiceCallback
    {
        [OperationContract(IsOneWay = true)]
        void OnNewAlert(Alert a);
        [OperationContract(IsOneWay = true)]
        void OnProductEdited(Product p);
        [OperationContract(IsOneWay = true)]
        void OnHighlightChanged(Dictionary<User, List<Product>> highlighted);
        [OperationContract(IsOneWay = true)]
        void OnCatalogUpdated();


        event EventHandler NewAlert;
        event EventHandler ProductEdited;
        event EventHandler HighlightChanged;
        event EventHandler CatalogUpdated;
    }

[ServiceContract(CallbackContract = typeof(IServiceCallback))]
    public interface IService : IDisposable
    {
        [OperationContract]
        List<Product> GetProducts(Predicate<Product> match = null, int limit = 0, string username = null);
        [OperationContract]
        Product GetProduct(Predicate<Product> match, string username = null);
        [OperationContract]
        Product GetRandomProduct(Predicate<Product> match = null, string username = null);
        [OperationContract]
        int GetFlagIndex(string flagName);
        [OperationContract]
        void SetFlag(string pid, string flagName, bool value);
        [OperationContract]
        List<Alert> GetAlerts(string username);
        [OperationContract]
        void DismissAlert(Alert alert, String username);
        [OperationContract]
        void HighlightProduct(List<string> pids, string user);
        [OperationContract]
        void EditProduct(string pid, Dictionary<string, object> fieldValues, string username = null);
        [OperationContract]
        void AttachModule(IModule m);
        [OperationContract]
        void Ping();
        
        event EventHandler NewAlert;
        event EventHandler ProductEdited;
        event EventHandler HighlightChanged;
        event EventHandler CatalogUpdated;
    }

Service implementation:
Code:
namespace Service
{
    [ServiceBehavior(InstanceContextMode = InstanceContextMode.PerCall, ConcurrencyMode = ConcurrencyMode.Reentrant)]
    public class ServiceInstance : IService
    {
        List<IServiceCallback> callbackChannels = new List<IServiceCallback>();
        //other vars

        public ServiceInstance(string foremanDbString, string unDbString)
        {
                //lots of stuff here
        }

        private User SignalUser(string username)
        {
            if (username == null)
                return null;

            IServiceCallback channel = OperationContext.Current.GetCallbackChannel<IServiceCallback>();
            if (!callbackChannels.Contains(channel)) //if CallbackChannels not contain current one.
            {
                callbackChannels.Add(channel);
            }

            User user = knownUsers.Find(p => p.username == username);
            if (user == null)
            {
                user = new User();
                user.username = username;
                user.highlighColor = Color.FromArgb(r.Next(0, 128), r.Next(0, 128), r.Next(0, 128));
                knownUsers.Add(user);
                foreach (KeyValuePair<Alert, List<User>> kvp in alerts)
                {
                    kvp.Value.Add(user);
                }
            }
            user.lastOnline = DateTime.Now;
            if(!onlineUsers.Contains(user))
                onlineUsers.Add(user);

            return user;
        }

        //lots of other things here
    }
}

Callback implementation on Client:
Code:
class ServiceEventHandler : IServiceCallback
    {
        public event EventHandler NewAlert;
        public event EventHandler ProductEdited;
        public event EventHandler HighlightChanged;
        public event EventHandler CatalogUpdated;

        public void OnCatalogUpdated()
        {
            CatalogUpdated?.BeginInvoke(null, null, null, null);
        }

        public void OnHighlightChanged(Dictionary<User, List<Product>> highlighted)
        {
            HighlightChanged?.BeginInvoke(highlighted, EventArgs.Empty, null, null);
        }

        public void OnNewAlert(Alert a)
        {
            NewAlert?.BeginInvoke(a, EventArgs.Empty, null, null);
        }

        public void OnProductEdited(Product p)
        {
            ProductEdited?.BeginInvoke(p, EventArgs.Empty, null, null);
        }
    }

But here is my problem:

On the client side, I'm supposed to pass it to the service like this:
Code:
EventHandler eventHandler = new EventHandler();
MyServiceClient client = new MyServiceClient(new InstanceContext(eventHandler));
according to this StackOverflow answer:
http://stackoverflow.com/a/1143777/2018696

But I don't connect to my service like this, because my client does not know about the implementation of the service, it only knows the two interfaces!
So I connect like this:
Code:
        public static IService GetService(string serviceAddress)
        {
            Uri service_uri = new Uri(serviceAddress);
            var endpoint = new EndpointAddress(service_uri, new[] { AddressHeader.CreateAddressHeader(settings["username"], "", "") });
            IService service = ChannelFactory<IService>.CreateChannel(new BasicHttpBinding(), endpoint);
            return service;
        }

So how do I get the callbacks to work?

Thanks!

EDIT:

Ok, so I replaced ChannelFactory with DuplexChannelFactory and BasicHTTPBinding with WsDualHTTPBinding, and I don't get response from the server. I do get response with BasicHTTPBinding if I scratch the callback handler. So essentially:
Code:
[ServiceContract]
BasicHttpBinding();
ChannelFactory<IService>.CreateChannel(binding, endpoint);
^ this works
Code:
[ServiceContract(CallbackContract = typeof(IServiceCallback))]
WSDualHttpBinding(WSDualHttpSecurityMode.None);
DuplexChannelFactory<IService>.CreateChannel(new InstanceContext(handler), binding, endpoint);
^ this doesn't.

It works on localhost, but not on LAN or Internet. Firewalls are off on both server and client. I'm getting 60 second timeout when I try to contact the server.
Edited by ronnin426850 - 6/12/16 at 8:29am
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post #6 of 11
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post #7 of 11
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post #8 of 11
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post #9 of 11

Do you absolutely have to use WCF?  If so, what are your authentication requirements?

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post #10 of 11
Thread Starter 
Quote:
Originally Posted by BFRD View Post

Do you absolutely have to use WCF?  If so, what are your authentication requirements?

Ah, I had forgotten about this thread! biggrin.gif

I have discovered that my connection issues are due to no port forwarding being set on the path to the client. Since I can't ensure proper port access to clients, I have reverted back to non-callback model, and will be using regular request from clients to received accumulated event data from the service. Probably not efficient, but a foolproof method that seems to be working so far.

So that's solved smile.gif
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