Refactoring of Webhooks and Email Rules (#6954)

BTCPayServer/Plugins/Webhooks/HostedServices/CleanupWebhookDeliveriesTask.cs

@@ -0,0 +1,58 @@
+using System;
+using Dapper;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+using BTCPayServer.Data;
+using Microsoft.EntityFrameworkCore;
+using BTCPayServer.HostedServices;
+
+namespace BTCPayServer.Plugins.Webhooks.HostedServices
+{
+    public class CleanupWebhookDeliveriesTask : IPeriodicTask
+    {
+        public CleanupWebhookDeliveriesTask(ApplicationDbContextFactory dbContextFactory)
+        {
+            DbContextFactory = dbContextFactory;
+        }
+
+        public ApplicationDbContextFactory DbContextFactory { get; }
+        public int BatchSize { get; set; } = 500;
+        public TimeSpan PruneAfter { get; set; } = TimeSpan.FromDays(60);
+
+        public async Task Do(CancellationToken cancellationToken)
+        {
+            await using var ctx = DbContextFactory.CreateContext();
+            var conn = ctx.Database.GetDbConnection();
+            bool pruned = false;
+            int offset = 0;
+retry:
+            var rows = await conn.QueryAsync<WebhookDeliveryData>(@"
+SELECT ""Id"", ""Blob""
+FROM ""WebhookDeliveries""
+WHERE ((now() - ""Timestamp"") > @PruneAfter) AND ""Pruned"" IS FALSE
+ORDER BY ""Timestamp""
+LIMIT @BatchSize OFFSET @offset
+", new { PruneAfter, BatchSize, offset });
+
+            foreach (var d in rows)
+            {
+                var blob = d.GetBlob();
+                blob.Prune();
+                d.SetBlob(blob);
+                d.Pruned = true;
+                pruned = true;
+            }
+            if (pruned)
+            {
+                pruned = false;
+                await conn.ExecuteAsync("UPDATE \"WebhookDeliveries\" SET \"Blob\"=@Blob::JSONB, \"Pruned\"=@Pruned WHERE \"Id\"=@Id", rows);
+                if (rows.Count()  == BatchSize)
+                {
+                    offset += BatchSize;
+                    goto retry;
+                }
+            }
+        }
+    }
+}