fix(discord): add backoff to scheduler to prevent 403 spam

- SessionSchedulerService now backs off for 15 minutes after any handler failure (confirmation, one-hour reminder, join link), preventing infinite retry loops on Discord 403 Missing Access. - Added per-session ConcurrentDictionary backoff tracking with automatic cleanup on success. - Enhanced DiscordPlatformMessenger logging for SendConfirmation and SendJoinLink to aid permission diagnostics. - Added 3 regression tests for backoff behavior. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
2026-05-26 15:51:25 +03:00
parent 9fc434b42b
commit a5aed14dd2
3 changed files with 171 additions and 21 deletions
@@ -98,17 +98,34 @@ public sealed class DiscordPlatformMessenger : IPlatformMessenger
        CancellationToken ct)
    {
        var channelId = GetChannelId(request.Group);
-        var message = await restClient.SendMessageAsync(
-            channelId,
-            new MessageProperties()
-                .WithEmbeds([BuildConfirmationEmbed(request)])
-                .WithComponents(BuildRsvpRows(request.SessionId, disabled: false)));
+        try
+        {
+            var message = await restClient.SendMessageAsync(
+                channelId,
+                new MessageProperties()
+                    .WithEmbeds([BuildConfirmationEmbed(request)])
+                    .WithComponents(BuildRsvpRows(request.SessionId, disabled: false)));

-        return new PlatformMessageRef(
-            PlatformKind.Discord,
-            request.Group.ExternalGroupId,
-            null,
-            message.Id.ToString(CultureInfo.InvariantCulture));
+            logger?.LogInformation(
+                "Confirmation request sent to Discord channel {ChannelId}, message id {MessageId}",
+                channelId,
+                message.Id);
+
+            return new PlatformMessageRef(
+                PlatformKind.Discord,
+                request.Group.ExternalGroupId,
+                null,
+                message.Id.ToString(CultureInfo.InvariantCulture));
+        }
+        catch (Exception ex)
+        {
+            logger?.LogError(
+                ex,
+                "Failed to send confirmation request to Discord channel {ChannelId} for session {SessionId}",
+                channelId,
+                request.SessionId);
+            throw;
+        }
    }

    public async Task UpdateConfirmationRequestAsync(PlatformRsvpMessageUpdate update, CancellationToken ct)
@@ -135,15 +152,32 @@ public sealed class DiscordPlatformMessenger : IPlatformMessenger
        CancellationToken ct)
    {
        var channelId = GetChannelId(notification.Group);
-        var message = await restClient.SendMessageAsync(
-            channelId,
-            new MessageProperties().WithEmbeds([BuildJoinLinkEmbed(notification)]));
+        try
+        {
+            var message = await restClient.SendMessageAsync(
+                channelId,
+                new MessageProperties().WithEmbeds([BuildJoinLinkEmbed(notification)]));

-        return new PlatformMessageRef(
-            PlatformKind.Discord,
-            notification.Group.ExternalGroupId,
-            null,
-            message.Id.ToString(CultureInfo.InvariantCulture));
+            logger?.LogInformation(
+                "Join link sent to Discord channel {ChannelId}, message id {MessageId}",
+                channelId,
+                message.Id);
+
+            return new PlatformMessageRef(
+                PlatformKind.Discord,
+                notification.Group.ExternalGroupId,
+                null,
+                message.Id.ToString(CultureInfo.InvariantCulture));
+        }
+        catch (Exception ex)
+        {
+            logger?.LogError(
+                ex,
+                "Failed to send join link to Discord channel {ChannelId} for session {SessionId}",
+                channelId,
+                notification.SessionId);
+            throw;
+        }
    }

    public async Task SendDirectSessionNotificationAsync(