Seperated eventhub service from api service.

wip nbs flow.
Changed uploading a bit.

FarmmapsApi/Services/FarmmapsEventHub.cs

@@ -0,0 +1,45 @@
+using System;
+using System.Threading.Tasks;
+using FarmmapsApi.Models;
+using Microsoft.AspNetCore.Http.Connections;
+using Microsoft.AspNetCore.SignalR.Client;
+using Microsoft.Extensions.Logging;
+
+namespace FarmmapsApi.Services
+{
+    public class FarmmapsEventHub
+    {
+        private readonly Configuration _configuration;
+        private readonly HttpClientSettings _httpClientSettings;
+
+        private HubConnection _hubConnection;
+
+        public event Action<EventMessage> EventCallback;
+
+        public FarmmapsEventHub(HttpClientSettings httpClientSettings, Configuration configuration)
+        {
+            _httpClientSettings = httpClientSettings;
+            _configuration = configuration;
+        }
+        
+        public async Task StartEventHub()
+        {
+            if(_hubConnection != null)
+                throw new Exception("EventHub already started");
+            
+            var eventEndpoint = $"{_configuration.Endpoint}/EventHub";
+            _hubConnection = new HubConnectionBuilder()
+                .WithUrl(eventEndpoint, HttpTransportType.WebSockets,
+                    options => options.SkipNegotiation = true)
+                .ConfigureLogging(log => log.AddConsole())
+                .WithAutomaticReconnect()
+                .Build();
+
+            await _hubConnection.StartAsync();
+            await _hubConnection.SendAsync("authenticate", _httpClientSettings.BearerToken);
+
+            _hubConnection.Reconnected += async s => await _hubConnection.SendAsync("authenticate", _httpClientSettings.BearerToken);
+            _hubConnection.On("Event", (EventMessage eventMessage) => EventCallback?.Invoke(eventMessage));
+        }
+    }
+}