ReportsHub, метод AddToGroup, который оповещает группу о статусе загрузки рапорта

AsbCloudWebApi/SignalR/ReportsHub.cs

@@ -1,4 +1,10 @@
-using Microsoft.AspNetCore.Authorization;
+using AsbCloudApp.Data;
+using AsbCloudInfrastructure.Background;
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.SignalR;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
 
 namespace AsbCloudWebApi.SignalR
 {
@@ -8,6 +14,43 @@ namespace AsbCloudWebApi.SignalR
     [Authorize]
     public class ReportsHub : BaseHub<IReportHubClient>
     {
-        
+        private readonly BackgroundWorker backgroundWorker;
+
+        public ReportsHub(BackgroundWorker backgroundWorker, IHubContext<ReportsHub> hubContext)
+        {
+            this.backgroundWorker = backgroundWorker;
+        }
+
+        public override async Task AddToGroup(string groupName)
+        {
+            var workId = groupName.Replace("Report_", "");
+            var work = backgroundWorker.WorkStore.RunOnceQueue.FirstOrDefault(work => work.Id == workId);
+            if (work is null) return;
+
+            await base.AddToGroup(groupName);
+            var state = work.CurrentState;
+            var progress = new ReportProgressDto()
+            {
+                Operation = "Ожидает начала в очереди.",
+                Progress = 0f,
+            };
+            if (state is not null)
+            {
+                progress = new ReportProgressDto
+                {
+                    CurrentPage = 0,
+                    Operation = state.State,
+                    Progress = (float)state.Progress,
+                    TotalPages = 0,
+                };
+            }
+
+            await Clients.Group(groupName).SendAsync(
+                nameof(IReportHubClient.GetReportProgress),
+                progress,
+                CancellationToken.None
+            );
+
+        }
     }
 }