"hello world" CommandsFeature not working

ServiceStack Plugins
1

Trying to implement my first CommandsFeature and am getting the error “No service for type ‘DVApi.Interface.wOBACalculatorCommand’ has been registered”.

public class wOBACalculatorCommand(
    ICacheClientAsync cacheClientAsync,
    IServiceGatewayAsync gatewayAsync,
    ILogger<wOBACalculatorCommand> log)
    : AsyncCommandWithResult<wOBACoefficients, wOBACoefficients>
{
    protected override async Task<wOBACoefficients> RunAsync(wOBACoefficients req, CancellationToken token)
    {
        log.LogInformation("Got to wOBA command");
        return req;
    }
}

I have registered the plugin like so

[assembly: HostingStartup(typeof(DVApi.ConfigureCommands))]

namespace DVApi;

public class ConfigureCommands : IHostingStartup
{
    public void Configure(IWebHostBuilder builder) => builder
        .ConfigureServices((ctx, services) =>
        {
            services.AddPlugin(new CommandsFeature());
        });
}

and here is how I am trying to call it…

public class DashService(ICommandExecutor cmdExecutor) : DVService
{
    public async Task<DashPitcherBattedBallResponse> GetAsync(DashPitcherBattedBall req)
    {
        var resp = new DashPitcherBattedBallResponse();
        resp.PopulateWith(req);

        var cmd = cmdExecutor.Command<wOBACalculatorCommand>();
        await cmd.ExecuteAsync(new wOBACoefficients());

        return resp;
    }
}
2

Are commands located in the same assembly as your ServiceStack Services? (e.g. DashService).

Does your App use Endpoint Routing and ASP .NET Core IOC?

1 Like
3

Thank you for the prompt reply, the issue was that I am not using Endpoint Routing, and I won’t be able to without a big refactor, so I’ll have to skip Commands for now.

4

You shouldn’t need to, but it’s not able to find your command types.

You could use a custom Type Resolver that returns the command types, e.g:

services.AddPlugin(new CommandsFeature {
    TypeResolvers =
    {
        // Return all Command Types in this Assembly
        () => typeof(wOBACalculatorCommand).Assembly.GetTypes()
            .Where(x => x.HasInterface(typeof(IAsyncCommand))),

        // Or any other way to return an array of command types, e.g:
        () => [typeof(wOBACalculatorCommand)],
    }
});

You could also explicitly register each command, e.g:

services.AddTransient<wOBACalculatorCommand>();
5

That was my problem with trying out the commands feature, you have to have them in the same assembly as your services. Once I figured that out it worked fine.

1 Like