/// <summary>
/// Subscribes a connection to cluster events.
/// </summary>
/// <param name="connection">The connection.</param>
/// <param name="correlationId">The correlation identifier.</param>
/// <param name="cancellationToken">A cancellation token.</param>
/// <returns>A task that will complete when the subscription has been processed, and represent whether it was successful.</returns>
private async Task <bool> SubscribeToClusterEventsAsync(MemberConnection connection, long correlationId, CancellationToken cancellationToken)
{
// aka subscribe to member/partition view events
HConsole.TraceLine(this, "subscribe");
// handles the event
ValueTask HandleEventAsync(ClientMessage message, object _)
=> ClientAddClusterViewListenerCodec.HandleEventAsync(message,
HandleCodecMemberViewEvent,
HandleCodecPartitionViewEvent,
connection.Id,
_clusterState.LoggerFactory);
try
{
var subscribeRequest = ClientAddClusterViewListenerCodec.EncodeRequest();
_correlatedSubscriptions[correlationId] = new ClusterSubscription(HandleEventAsync);
_ = await _clusterMessaging.SendToMemberAsync(subscribeRequest, connection, correlationId, cancellationToken).CfAwait();
HConsole.WriteLine(this, "subscribed");
return(true);
}
catch (Exception e)
{
HConsole.WriteLine(this, "failed " + e);
_correlatedSubscriptions.TryRemove(correlationId, out _);
_logger.LogWarning(e, "Failed to subscribe to cluster events, may retry.");
return(false);
}
}
public IPAddress[] GetHostAddresses(string hostNameOrAddress)
{
Count++;
HConsole.TraceLine(this, $"GetHostAddresses {hostNameOrAddress} {Count}/{_failAt}");
if (Count == _failAt)
{
throw new SocketException((int)SocketError.HostNotFound);
}
return(Dns.GetHostAddresses(hostNameOrAddress));
}