Is there pattern support in channel name?

[AlexanderButs]

Hey.

Thanks for such a great project. Looks promising.

Is there a way to describe channel name I publish events to as a pattern like "foo.{some_changing_pattern}"? Some context: I use queues in NATS to publish events and route them to proper websocket server to push to the client further. So I have a lot of queues with different names which follow one naming pattern.

Thanks in advance. Alex.

[m-wild]

Hi Alex, At the moment there are 2 options for describing channel parameters

1. Easy: Using the [ChannelParameterAttribute]

   [Channel("foo.{id}")]
   [ChannelParameter("id", typeof(int), Description = "The ID of the Foo")]
   public Foo(int id) {}

   channels:
     foo.{id}:
       parameters:
         id:
           description: "The ID of the Foo"
           schema:
             type: number
             format: int32

2. Advanced: You could also do something like the below to automatically scan for parameters...

   [Channel("foo.{id}")]
   public Foo(int id) {}
   
   public class ParameterFilter : IChannelItemFilter
   {
       public void Apply(ChannelItem channelItem, ChannelItemFilterContext context)
       {
           // here you could grab parameters from the method, or from the channel attribute...
           if (context.Member is MethodInfo method)
           {
               var param = method.GetParameters();
               foreach (var p in param)
               {
                   // add each method parameter to the channel item
                   channelItem.Parameters[p.Name] = new Parameter
                   {
                       Schema = context.SchemaGenerator.Generate(p.GetType())
                   };
               }
           }
       }
   }
   
   services.AddAsyncApiSchemaGeneration(options =>
   {
       options.ChannelItemFilters.Add(new ParameterFilter());
   }

   channels:
     foo.{id}:
       parameters:
         id:
           schema:
             type: number
             format: int32

[AlexanderButs]

Wow! Great! Super extensible library.

Thank you very much!

[m-wild]

Glad to help. I will close this issue now, but feel free to re-open it if you have any problems 😃