// fire and forget
private async void DoReconnect()
{
var reconnectUrl = UrlBuilder.BuildReconnect(_connection, Name, _connectionData);
while (TransportHelper.VerifyLastActive(_connection) && _connection.EnsureReconnecting())
{
try
{
await Task.Delay(ReconnectDelay);
await PerformConnect(reconnectUrl);
break;
}
catch (OperationCanceledException)
{
break;
}
catch (Exception ex)
{
if (ExceptionHelper.IsRequestAborted(ex))
{
break;
}
_connection.OnError(ex);
}
}
}
// internal for testing
internal async Task Reconnect(IConnection connection, string connectionData)
{
var reconnectUrl = UrlBuilder.BuildReconnect(connection, Name, connectionData);
if (ConnectionState.Disconnected == connection.State || !_webSocket.IsConnected)
{
while (TransportHelper.VerifyLastActive(connection) && connection.EnsureReconnecting() && !_disconnectToken.IsCancellationRequested)
{
try
{
await StartWebSocket(connection, reconnectUrl);
if (connection.ChangeState(ConnectionState.Reconnecting, ConnectionState.Connected))
{
connection.OnReconnected();
}
break;
}
catch (OperationCanceledException)
{
break;
}
catch (Exception ex)
{
connection.OnError(ex);
}
await Task.Delay(ReconnectDelay);
}
}
}
private async Task DoReconnect()
{
var reconnectUrl = UrlBuilder.BuildReconnect(connection, Name, connectionData);
while (TransportHelper.VerifyLastActive(connection))
{
if (connection.EnsureReconnecting())
{
try
{
PerformConnect(reconnectUrl);
break;
}
catch (OperationCanceledException)
{
break;
}
catch (Exception ex)
{
connection.OnError(ex);
}
await Task.Delay(ReconnectDelay, CancellationToken.None).ConfigureAwait(false);
}
else
{
break;
}
}
}
// fire and forget
private async void DoReconnect()
{
try
{
var reconnectUrl = UrlBuilder.BuildReconnect(_connection, Name, _connectionData);
while (TransportHelper.VerifyLastActive(_connection) && _connection.EnsureReconnecting())
{
try
{
await PerformConnect(reconnectUrl, _disconnectToken);
break;
}
catch (OperationCanceledException)
{
return;
}
catch (Exception ex)
{
if (ExceptionHelper.IsRequestAborted(ex))
{
return;
}
_connection.OnError(ex);
}
await Task.Delay(ReconnectDelay);
}
var linkedToken = CreateLinkedCancellationToken();
try
{
await _webSocketHandler.ProcessWebSocketRequestAsync(_webSocket, linkedToken);
}
catch
{
// Ignore any errors from ProcessWebSocketRequestAsync just as OnStart does after the init message is received.
// Any errors other than one thrown from the final CloseAsync is reported via OnError(Exception).
}
}
catch (Exception ex)
{
_connection.Trace(TraceLevels.Events, "WS DoReconnect() failed: {0}", ex);
}
}
private string ResolveUrl(IConnection connection, string connectionData)
{
string url;
if (connection.MessageId == null)
{
url = UrlBuilder.BuildConnect(connection, Name, connectionData);
connection.Trace(TraceLevels.Events, "LP Connect: {0}", url);
}
else if (IsReconnecting(connection))
{
url = UrlBuilder.BuildReconnect(connection, Name, connectionData);
connection.Trace(TraceLevels.Events, "LP Reconnect: {0}", url);
}
else
{
url = UrlBuilder.BuildPoll(connection, Name, connectionData);
connection.Trace(TraceLevels.Events, "LP Poll: {0}", url);
}
return(url);
}
internal void OpenConnection(IConnection connection, string data, CancellationToken disconnectToken, bool reconnecting)
{
// If we're reconnecting add /connect to the url
var url = reconnecting
? UrlBuilder.BuildReconnect(connection, Name, data)
: UrlBuilder.BuildConnect(connection, Name, data);
connection.Trace(TraceLevels.Events, "SSE: GET {0}", url);
var getTask = HttpClient.Get(url, req =>
{
_request = req;
_request.Accept = "text/event-stream";
connection.PrepareRequest(_request);
}, isLongRunning: true);
var requestCancellationRegistration = disconnectToken.SafeRegister(state =>
{
_stop = true;
// This will no-op if the request is already finished.
((IRequest)state).Abort();
}, _request);
getTask.ContinueWith(task =>
{
if (task.IsFaulted || task.IsCanceled)
{
var exception = task.IsCanceled
? new OperationCanceledException(Resources.Error_TaskCancelledException)
: task.Exception.Unwrap();
if (!reconnecting)
{
// It shouldn't be possible for Start to have already succeeded at this point.
TryFailStart(exception);
}
else if (!_stop)
{
// Only raise the error event if the error wasn't raised from Start and we're reconnecting.
connection.OnError(exception);
Reconnect(connection, data, disconnectToken);
}
requestCancellationRegistration.Dispose();
}
else
{
// If the disconnect token is canceled the response to the task doesn't matter.
if (disconnectToken.IsCancellationRequested)
{
return;
}
var response = task.Result;
Stream stream = response.GetStream();
var eventSource = new EventSourceStreamReader(connection, stream);
eventSource.Opened = () =>
{
// This will noop if we're not in the reconnecting state
if (connection.ChangeState(ConnectionState.Reconnecting, ConnectionState.Connected))
{
// Raise the reconnect event if the connection comes back up
connection.OnReconnected();
}
};
eventSource.Message = sseEvent =>
{
if (sseEvent.EventType == EventType.Data &&
!sseEvent.Data.Equals("initialized", StringComparison.OrdinalIgnoreCase))
{
ProcessResponse(connection, sseEvent.Data);
}
};
eventSource.Closed = exception =>
{
// Make sure to try to fail start even if the disconnectToken tripped and set _stop to true.
var startFailed = TryFailStart(exception);
if (exception != null && !startFailed)
{
// Check if the request is aborted
if (!ExceptionHelper.IsRequestAborted(exception))
{
// Don't raise exceptions if the request was aborted (connection was stopped).
connection.OnError(exception);
}
}
requestCancellationRegistration.Dispose();
response.Dispose();
if (_stop)
{
AbortHandler.CompleteAbort();
}
else if (!AbortHandler.TryCompleteAbort() && !startFailed)
{
// If Abort() was called or Start() failed, don't reconnect.
Reconnect(connection, data, disconnectToken);
}
};
eventSource.Start();
}
});
}
