WCF client logging dotnet core

Question

I'm using asp.net core on windows and have a file with classes generated by the dotnet-svcutil. I'm using nlog for the logging purpose. Is there a way I can log all the raw requests and responses to and from the external service?

Already tried logman https://github.com/dotnet/wcf/blob/master/Documentation/HowToUseETW.md, but first - it doesn't show the raw soap, only events, and second - I need logs to be logged by the configured nlog.

Answer 1

Behaviour:

public class LoggingEndpointBehaviour : IEndpointBehavior
{
    public LoggingMessageInspector MessageInspector { get; }

    public LoggingEndpointBehaviour(LoggingMessageInspector messageInspector)
    {
        MessageInspector = messageInspector ?? throw new ArgumentNullException(nameof(messageInspector));
    }

    public void AddBindingParameters(ServiceEndpoint endpoint, BindingParameterCollection bindingParameters)
    {
    }

    public void ApplyClientBehavior(ServiceEndpoint endpoint, ClientRuntime clientRuntime)
    {
        clientRuntime.ClientMessageInspectors.Add(MessageInspector);
    }

    public void ApplyDispatchBehavior(ServiceEndpoint endpoint, EndpointDispatcher endpointDispatcher)
    {
    }

    public void Validate(ServiceEndpoint endpoint)
    {
    }
}

Inspector:

 public class LoggingMessageInspector : IClientMessageInspector
{
    public LoggingMessageInspector(ILogger<LoggingMessageInspector> logger)
    {
        Logger = logger ?? throw new System.ArgumentNullException(nameof(logger));
    }

    public ILogger<LoggingMessageInspector> Logger { get; }

    public void AfterReceiveReply(ref Message reply, object correlationState)
    {
        using (var buffer = reply.CreateBufferedCopy(int.MaxValue))
        {
            var document = GetDocument(buffer.CreateMessage());
            Logger.LogTrace(document.OuterXml);

            reply = buffer.CreateMessage();
        }
    }

    public object BeforeSendRequest(ref Message request, IClientChannel channel)
    {
        using (var buffer = request.CreateBufferedCopy(int.MaxValue))
        {
            var document = GetDocument(buffer.CreateMessage());
            Logger.LogTrace(document.OuterXml);

            request = buffer.CreateMessage();
            return null;
        }
    }

    private XmlDocument GetDocument(Message request)
    {
        XmlDocument document = new XmlDocument();
        using (MemoryStream memoryStream = new MemoryStream())
        {
            // write request to memory stream
            XmlWriter writer = XmlWriter.Create(memoryStream);
            request.WriteMessage(writer);
            writer.Flush();
            memoryStream.Position = 0;

            // load memory stream into a document
            document.Load(memoryStream);
        }

        return document;
    }
}

Usage:

 if (configuration.GetValue<bool>("Logging:MessageContent"))
     client.Endpoint.EndpointBehaviors.Add(serviceProvider.GetRequiredService<LoggingEndpointBehaviour>());