Restack

Restack is an easy to declare and inject, autogenerated proxy for an HTTP service. The idea is to make a full featured resilient HTTP client. It's inspired by the David Fowler's project RestSample and forked from Ryan Nowak work on Kickr.

Its implementation is based on:

• refit
• Polly
• consul

Example of the refit / Polly support

1. Define an interface for your rest service.

   public interface IGeoApi
   {
       [Get("/regions")]
       Task<IEnumerable<Region>> GetRegionsAsync();
   }

2. Configure the URL for your service and add some http request headers and policies.

   public void ConfigureServices(IServiceCollection services)
   {
       services.AddMvc();
       
       services.AddRestack() // configure Restack HttpClientFactory
               .AddPolly();  // configure Polly
   
       services.AddRestackGlobalHeaders(o => o.Headers.Add("user-agent", "myagent"));
   
       services.AddRestClient<IGeoApi>("https://geo.api.gouv.fr")
               .AddRestackHeaders<IGeoApi>(o => o.Headers.Add("api-key", "xxxxx-xxx-xxxxxxxx"))
               .AddRestackPolicy<IGeoApi>(b => b.RetryAsync())
               .AddRestackPolicy<IGeoApi>(b => b.CircuitBreakerAsync(1, TimeSpan.FromSeconds(5)));
   }

3. Consume the interface via RestClient<T>.

   public class HomeController : Controller
   {
       private readonly IGeoApi _geoApi;
   
       public HomeController(IRestClient<IGeoApi> geoApiClient)
       {
           _geoApi = geoApiClient.Client;
       }
   
       [HttpGet("/")]
       public async Task<IActionResult> Get()
       {
           var regions = await _geoApi.GetRegionsAsync();
   
           return Ok(regions);
       }
   }

Example of the ASP.NET MVC HttpClient param binding support

1. Configure some http request headers for the "github" named http client".

   public void ConfigureServices(IServiceCollection services)
   {
       services.AddMvc()
               .AddRestackModelBinder(); // configure Restack MVC
       
       services.AddRestack(); // configure Restack HttpClientFactory
   
       services.AddRestackGlobalHeaders(o => o.Headers.Add("user-agent", "myagent"));
       services.AddRestackHeaders("github", o => o.Headers.Add("Accept", "application/vnd.github.v3+json"));
   }

2. Consume the HttpClient.

   public class HomeController : Controller
   {
       public async Task<IActionResult> Index([HttpClientName("github")]HttpClient client)
       {
           var response = await client.GetAsync("https://api.github.com/users/lecaillon");
           ...
       }
   }