Bugfix for AdminView

Wollmilchsau/Store/AdminStore/AdminEffects.cs

@@ -129,9 +129,10 @@ public sealed class AdminEffects(IMoodleService moodleService, ILdapService ldap
         {
             await cache.RemoveAsync(MoodleUsersCacheKey);
         }
-        catch (RedisException)
+        catch (RedisException exception)
         {
-            ReportMoodleDeletionFailure(dispatcher, "Moodle deletion did not start because the cache could not be invalidated.");
+            dispatcher.Dispatch(new MoodleUsersDeletionFailed());
+            snackbar.Add($"Moodle deletion did not start because the cache could not be invalidated: {exception.Message}", Severity.Error);
             return;
         }
 
@@ -162,37 +163,83 @@ public sealed class AdminEffects(IMoodleService moodleService, ILdapService ldap
             await moodleService.DeleteUsers(userIds);
             return true;
         }
-        catch (HttpRequestException)
+        catch (HttpRequestException exception)
         {
-            ReportMoodleDeletionFailure(dispatcher, deletedUserCount, totalUserCount);
+            await ReportMoodleDeletionFailure(dispatcher, exception, userIds, deletedUserCount, totalUserCount);
         }
-        catch (InvalidOperationException)
+        catch (InvalidOperationException exception)
         {
-            ReportMoodleDeletionFailure(dispatcher, deletedUserCount, totalUserCount);
+            await ReportMoodleDeletionFailure(dispatcher, exception, userIds, deletedUserCount, totalUserCount);
         }
-        catch (TaskCanceledException)
+        catch (TaskCanceledException exception)
         {
-            ReportMoodleDeletionFailure(dispatcher, deletedUserCount, totalUserCount);
+            await ReportMoodleDeletionFailure(dispatcher, exception, userIds, deletedUserCount, totalUserCount);
         }
-        catch (JsonException)
+        catch (JsonException exception)
         {
-            ReportMoodleDeletionFailure(dispatcher, deletedUserCount, totalUserCount);
+            await ReportMoodleDeletionFailure(dispatcher, exception, userIds, deletedUserCount, totalUserCount);
         }
 
         return false;
     }
 
-    private void ReportMoodleDeletionFailure(IDispatcher dispatcher, int deletedUserCount, int totalUserCount)
-    {
-        ReportMoodleDeletionFailure(
-            dispatcher,
-            $"Moodle deletion stopped after deleting {deletedUserCount} of {totalUserCount} user(s). Later users were not processed.");
-    }
-
-    private void ReportMoodleDeletionFailure(IDispatcher dispatcher, string message)
+    private async Task ReportMoodleDeletionFailure(
+        IDispatcher dispatcher,
+        Exception exception,
+        IReadOnlyCollection<int> failedUserIds,
+        int deletedUserCount,
+        int totalUserCount)
     {
         dispatcher.Dispatch(new MoodleUsersDeletionFailed());
-        snackbar.Add(message, Severity.Error);
+
+        var reconciliationMessage = await ReconcileMoodleUsersAfterDeletionFailure(dispatcher, failedUserIds);
+        snackbar.Add(
+            $"Moodle deletion stopped after confirming {deletedUserCount} of {totalUserCount} user(s). Reason: {exception.Message}.{reconciliationMessage}",
+            Severity.Error);
+    }
+
+    private async Task<string> ReconcileMoodleUsersAfterDeletionFailure(
+        IDispatcher dispatcher,
+        IReadOnlyCollection<int> failedUserIds)
+    {
+        try
+        {
+            var users = await moodleService.GetAllUsers();
+            dispatcher.Dispatch(new SetMoodleUsers(users));
+
+            try
+            {
+                await cache.SetStringAsync(
+                    MoodleUsersCacheKey,
+                    JsonSerializer.Serialize(users),
+                    new DistributedCacheEntryOptions { SlidingExpiration = TimeSpan.FromMinutes(10) });
+            }
+            catch (RedisException exception)
+            {
+                return $" The user list was refreshed from Moodle, but Redis could not be updated: {exception.Message}";
+            }
+
+            var deletedFromFailedRequest = failedUserIds.Count(userId => !users.Any(user => user.Id == userId));
+            return deletedFromFailedRequest == 0
+                ? " The user list was refreshed from Moodle."
+                : $" The user list was refreshed from Moodle; {deletedFromFailedRequest} user(s) from the failed request were deleted server-side.";
+        }
+        catch (HttpRequestException exception)
+        {
+            return $" The user list could not be refreshed: {exception.Message}";
+        }
+        catch (InvalidOperationException exception)
+        {
+            return $" The user list could not be refreshed: {exception.Message}";
+        }
+        catch (TaskCanceledException exception)
+        {
+            return $" The user list could not be refreshed: {exception.Message}";
+        }
+        catch (JsonException exception)
+        {
+            return $" The user list could not be refreshed: {exception.Message}";
+        }
     }
 
     [EffectMethod]