Changed way of retrieving last telemetry date for wells

AsbCloudInfrastructure/Services/TelemetryTracker.cs

@@ -2,13 +2,42 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using AsbCloudDb.Model;
+using AsbCloudInfrastructure.Services.Cache;
+using Microsoft.EntityFrameworkCore;
 
 namespace AsbCloudInfrastructure.Services
 {
     public class TelemetryTracker : ITelemetryTracker
     {
-        private Dictionary<string, DateTime> requests = new Dictionary<string, DateTime>();
+        private Dictionary<string, DateTime> requests;
-        private readonly TimeSpan timeout = TimeSpan.FromDays(7);
+        private readonly TimeSpan timeout;
+
+        public TelemetryTracker(CacheDb cacheDb)
+        {
+            timeout = TimeSpan.FromDays(7);
+
+            var options = new DbContextOptionsBuilder<AsbCloudDbContext>()
+                .UseNpgsql("Host=localhost;Database=postgres;Username=postgres;Password=q;Persist Security Info=True")
+                .Options;
+            using var db = new AsbCloudDbContext(options);
+            
+            var cacheTelemetry = cacheDb.GetCachedTable<Telemetry>(db);
+            
+            var lastTelemetriesDates = (from d in db.TelemetryDataSaub
+                                        group d by d.IdTelemetry into g
+                                        select new
+                                        {
+                                            IdTelemetry = g.Max(t => t.IdTelemetry),
+                                            Date = g.Max(t => t.Date)
+                                        }).ToList();
+
+            requests = lastTelemetriesDates.Select(t => new
+            {
+                Uid = cacheTelemetry.FirstOrDefault(c => c.Id == t.IdTelemetry).RemoteUid,
+                t.Date
+            }).ToDictionary(t => t.Uid, u => u.Date);
+        }
 
         public void SaveRequestDate(string uid)
         {
@@ -25,7 +54,7 @@ namespace AsbCloudInfrastructure.Services
             return requests.Keys;
         }
         
-        private void DeleteOldRequestDates()
+        private void DeleteOldRequestDates() // TODO: удалить этот метод
         {
             requests = requests.Where(dValue => (DateTime.Now - dValue.Value) < timeout)
                 .ToDictionary(dValue => dValue.Key, dValue => dValue.Value);

AsbCloudInfrastructure/Services/WellService.cs

@@ -29,15 +29,13 @@ namespace AsbCloudInfrastructure.Services
 
         public DateTime GetLastTelemetryDate(int idWell)
         {
-            var defaultDate = DateTime.MinValue;
             var well = cacheWells.FirstOrDefault(w => w.Id == idWell);
             
             if (well?.IdTelemetry is null)
-                return defaultDate;
+                return DateTime.MinValue;
 
-            var lastTelemetry = db.TelemetryDataSaub
+            var lastTelemetryDate = telemetryService.GetLastTelemetryDate((int)well.IdTelemetry);
-                .FirstOrDefault(t => t.Id == well.IdTelemetry);
+            return lastTelemetryDate;
-            return lastTelemetry?.Date ?? defaultDate;
         }
 
         public async Task<IEnumerable<WellDto>> GetTransmittingWellsAsync(int idCompany,