Initial work on getting minimal API to work

AS1024.GeoFeed/Controllers/GeofeedController.cs

@@ -3,7 +3,6 @@ using AS1024.GeoFeed.Core.Interfaces;
 using Microsoft.Extensions.Caching.Memory;
 using AS1024.GeoFeed.Models;
 using System.Text;
-using AS1024.GeoFeed.Core.GeoFeedLocalCache;
 using AS1024.GeoFeed.Core.Tools;
 
 namespace AS1024.GeoFeed.Controllers
@@ -18,16 +17,16 @@ namespace AS1024.GeoFeed.Controllers
         private readonly IMemoryCache memoryCache;
         private readonly IWebHostEnvironment environment;
         private readonly ILogger<GeofeedController> logger;
-        private readonly GeoFeedCacheDbContext dbContext;
+        private readonly IGeoFeedPersistentCacheProvider geoFeedPersistentCache;
         private const string GeoFeedCacheKey = "GeoFeedData";
 
         public GeofeedController(IGeoFeedProvider builder,
             IMemoryCache memoryCache,
             IWebHostEnvironment environment,
             ILogger<GeofeedController> logger,
-            GeoFeedCacheDbContext dbContext) {
+            IGeoFeedPersistentCacheProvider geoFeedPersistentCache) {
             this.logger = logger;
-            this.dbContext = dbContext;
+            this.geoFeedPersistentCache = geoFeedPersistentCache;
             this.builder = builder;
             this.memoryCache = memoryCache;
             this.environment = environment;
@@ -54,10 +53,7 @@ namespace AS1024.GeoFeed.Controllers
             } catch (HttpRequestException ex)
             {
                 logger.LogWarning($"Temporary failure of retrieving GeoData from upstream. {ex}");
-                var results = 
-                    dbContext.GeoFeedCacheEntries.ToList();
-                List<IPGeoFeed> cachedData = [];
-                results.ForEach(cachedData.Add);
+                var cachedData = geoFeedPersistentCache.GetGeoFeed();
                 return ReturnFile(cachedData);
             }
 
@@ -73,6 +69,12 @@ namespace AS1024.GeoFeed.Controllers
         private IActionResult ReturnFile(List<IPGeoFeed>? feed)
         {
             string csvContent = feed.ToGeoFeedCsv(); // Assuming ToGeoFeedCsv() returns a string in CSV format.
+            return ReturnFile(csvContent);
+        }
+
+        [NonAction]
+        private IActionResult ReturnFile(string csvContent)
+        {
             byte[] contentBytes = Encoding.UTF8.GetBytes(csvContent);
             string contentType = "text/csv";