Intercept controllers

Question

I am trying to create Audit logs for every controller so that I can keep track of invoked Actions. I am using .net core and Castle Core Dynamic Proxy.

class AuditInterceptor : IInterceptor
{
    private readonly IAuditingHelper _auditingHelper;

    public AuditingInterceptor(IAuditingHelper auditingHelper)
    {
        _auditingHelper = auditingHelper;
    }

    public void Intercept(IInvocation invocation)
    {
       invocation..Proceed();
       log.info(audit); // elided 
    }
}

How can I intercept every Controller ? I can use Simple injector or Autofac.

The reason I am not interested in Filters is that I have 4500 actions. I dont want to decorate them all.

Do you need all of that (external libraries, etc)? Wouldn't a simple ASP.NET Core middle-ware work for such a simple task? — Camilo Terevinto, Jun 20 '18 at 17:03
Essentially, I need Audits. In a middleware I can have access to Request and Response. But I need more structure. ie: Class name, method name, parameters. etc. — DarthVader, Jun 20 '18 at 17:06
What about using IActionFilter? ActionArguments gets you the parameters. — Mark G, Jun 20 '18 at 18:12

score 3 · Accepted Answer · edited Feb 13 '20 at 17:58

3

You could use an action filter for this. You can retrieve useful information about the controller and action being executed from the ActionDescriptor. For example:

public class AuditAttribute : ActionFilterAttribute
{
   public override void OnActionExecuting(ActionExecutingContext context)
   {
       var actionDescriptor = (ControllerActionDescriptor)context.ActionDescriptor;
       var controllerName = actionDescriptor.ControllerName;
       var actionName = actionDescriptor.ActionName;
       var parameters = actionDescriptor.Parameters;
       var fullName = actionDescriptor.DisplayName;
   }
}

You can register the action filter using an attribute on controllers/actions:

[Audit]
public async Task<IActionResult> Get()
{
}

Or globally (every action) at application startup:

services.AddMvc(c => c.Filters.Add(new AuditAttribute()));

edited Feb 13 '20 at 17:58

Matheus Lacerda

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answered Jun 20 '18 at 18:36

Henk Mollema

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i have 4500 controller action. There is a reason I am asking for interceptor. My fault, you wouldnt know that. – DarthVader Jun 22 '18 at 07:42
1

this is not the answer I am looking for. I know what a filter is dear sir. I want interceptor. – DarthVader Jun 26 '18 at 15:50
@DarthVader I've explained how you can decorate each action using a global filter so you don't have to decorate them individually in my answer. Action filters are just a technical detail to implement the interception concept. – Henk Mollema Jun 26 '18 at 17:19
no they are not. they are decorator not interceptor. – DarthVader Jun 26 '18 at 18:13

Intercept controllers

1 Answers1