private async Task PruneExpiredMessagesAsync(IRealm realm, CancellationToken stoppingToken)
{
var clientIds = realm.GetClientIdsWithQueue();
var now = DateTime.UtcNow;
var maxDiff = TimeSpan.FromSeconds(10);
var seenMap = new Dictionary <string, bool>();
foreach (var clientId in clientIds)
{
var messageQueue = realm.GetMessageQueueById(clientId);
if (messageQueue == null)
{
continue;
}
var lastReadDiff = now - messageQueue.GetReadTimestamp();
if (lastReadDiff < maxDiff)
{
continue;
}
var messages = messageQueue.GetAll();
foreach (var message in messages)
{
var seenKey = $"{message.Source}_{message.Destination};";
if (!seenMap.TryGetValue(seenKey, out var seen) || !seen)
{
var sourceClient = realm.GetClient(message.Source);
await realm.HandleMessageAsync(sourceClient, Message.Create(MessageType.Expire, string.Empty), stoppingToken);
seenMap[seenKey] = true;
}
}
realm.ClearMessageQueue(clientId);
}
_logger.LogInformation($"Pruned expired messages for {seenMap.Keys.Count} peers.");
}