/// <summary>Write client messages.</summary>
/// <param name="webSocket"> The web socket.</param>
/// <param name="clientGuid"> Unique identifier for the client.</param>
/// <param name="cancelToken">A token that allows processing to be canceled.</param>
/// <returns>An asynchronous result.</returns>
private async Task WriteClientMessages(
WebSocket webSocket,
Guid clientGuid,
CancellationToken cancelToken)
{
// get the client object
if (!WebsocketManager.TryGetClient(clientGuid, out WebsocketClientInformation client))
{
// nothing to do here (will cancel on exit)
return;
}
// loop until cancelled
while (!cancelToken.IsCancellationRequested)
{
// do not bubble errors here
try
{
// **** check for a message ***
if (!client.MessageQ.TryDequeue(out string message))
{
// wait and prevent exceptions
await Task.Delay(_sendSleepDelayMs, cancelToken)
.ContinueWith(_ => Task.CompletedTask);
// go to next loop
continue;
}
// grab a byte buffer of our data
byte[] buffer = Encoding.UTF8.GetBytes(message);
// send this message
await webSocket.SendAsync(
buffer,
WebSocketMessageType.Text,
true,
cancelToken).ConfigureAwait(false);
WebsocketManager.UpdateTimeoutForSentMessage(clientGuid);
}
// keep looping
catch (Exception ex)
{
Console.WriteLine($"SubscriptionWebsocketHandler.WriteClientMessages" +
$" <<< client: {clientGuid} caught exception: {ex.Message}");
// this socket is borked, exit
break;
}
}
}
