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.");
}
private async Task PruneZombieConnectionsAsync(IRealm realm)
{
var clientIds = realm.GetClientIds();
var now = DateTime.UtcNow;
var aliveTimeout = TimeSpan.FromSeconds(60);
var count = 0;
foreach (var clientId in clientIds)
{
var client = realm.GetClient(clientId);
var timeSinceLastHeartbeat = now - client.GetLastHeartbeat();
if (timeSinceLastHeartbeat < aliveTimeout)
{
continue;
}
var socket = client.GetSocket();
try
{
await socket?.CloseAsync($"Zombie connection, time since last heartbeat: {timeSinceLastHeartbeat.TotalSeconds}s");
}
finally
{
realm.ClearMessageQueue(clientId);
realm.RemoveClientById(clientId);
socket?.Dispose();
}
count++;
}
_logger.LogInformation($"Pruned zombie connections for {count} peers.");
}