polling for task status.

FarmmapsApi/Extensions.cs

@@ -1,4 +1,7 @@
+using System;
 using System.Net.Http;
+using System.Threading;
+using System.Threading.Tasks;
 using FarmmapsApi.HttpMessageHandlers;
 using FarmmapsApi.Models;
 using FarmmapsApi.Services;
@@ -9,7 +12,8 @@ namespace FarmmapsApi
 {
     public static class Extensions
     {
-        public static IServiceCollection AddFarmmapsServices(this IServiceCollection serviceCollection, Configuration configuration)
+        public static IServiceCollection AddFarmmapsServices(this IServiceCollection serviceCollection,
+            Configuration configuration)
         {
             return serviceCollection
                 .AddSingleton(configuration)
@@ -23,7 +27,26 @@ namespace FarmmapsApi
                 .AddTransient<FarmmapsAuthenticationHandler>()
                 .AddHttpClient<FarmmapsApiService>()
                 .AddHttpMessageHandler<FarmmapsAuthenticationHandler>()
-                .Services;;
+                .Services;
+            ;
+        }
+
+        public static async Task PollTask(TimeSpan retryTime, Func<CancellationTokenSource, Task> callback)
+        {
+            var tokenSource = new CancellationTokenSource();
+            var token = tokenSource.Token;
+            do
+            {
+                try
+                {
+                    await callback(tokenSource);
+                    await Task.Delay(retryTime, token);
+                }
+                catch
+                {
+                    // ignored
+                }
+            } while (!token.IsCancellationRequested);
         }
     }
 }

FarmmapsApi/Services/FarmmapsApiService.cs

@@ -11,8 +11,9 @@ using System.Threading.Tasks;
 using System.Web;
 using FarmmapsApi.Models;
 using IdentityModel;
+using Microsoft.AspNetCore.Http.Connections;
 using Microsoft.AspNetCore.SignalR.Client;
-using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Logging;
 using Newtonsoft.Json;
 using Newtonsoft.Json.Linq;
 
@@ -20,6 +21,7 @@ namespace FarmmapsApi.Services
 {
     public class FarmmapsApiService
     {
+        private readonly ILogger<FarmmapsApiService> _logger;
         private readonly HttpClient _httpClient;
         private readonly OpenIdConnectService _openIdConnectService;
         private readonly Configuration _configuration;
@@ -28,9 +30,10 @@ namespace FarmmapsApi.Services
 
         public event Action<EventMessage> EventCallback;
 
-        public FarmmapsApiService(HttpClient httpClient,
+        public FarmmapsApiService(HttpClient httpClient, ILogger<FarmmapsApiService> logger,
             OpenIdConnectService openIdConnectService, Configuration configuration)
         {
+            _logger = logger;
             _httpClient = httpClient;
             _openIdConnectService = openIdConnectService;
             _configuration = configuration;
@@ -65,13 +68,21 @@ namespace FarmmapsApi.Services
             var uri = new Uri(_configuration.Endpoint);
             var eventEndpoint = $"{uri.Scheme}://{uri.Host}:{uri.Port}/EventHub";
             _hubConnection = new HubConnectionBuilder()
-                .WithUrl(eventEndpoint)
+                .WithUrl(eventEndpoint, HttpTransportType.WebSockets, 
+                    options => options.SkipNegotiation = true)
+                .ConfigureLogging(log => log.AddConsole())
                 .WithAutomaticReconnect()
-                .AddJsonProtocol()
                 .Build();
-            _hubConnection.On("Event", (EventMessage @event) => EventCallback?.Invoke(@event));
 
             await _hubConnection.StartAsync();
+            await AuthenticateEventHub(accessToken);
+            
+            _hubConnection.Reconnected += async s => await AuthenticateEventHub(accessToken);
+            _hubConnection.On("event", (Object @event) => _logger.LogInformation(@event.ToString()));
+        }
+
+        private async Task AuthenticateEventHub(string accessToken)
+        {
             await _hubConnection.SendAsync("authenticate", accessToken);
         }