public async Task StartAsync(CancellationToken ct = default(CancellationToken))
{
if (_hasStarted)
{
throw new MorseLException($"Cannot call {nameof(StartAsync)} more than once.");
}
_hasStarted = true;
ct.Register(() => _connectionCts.TrySetCanceled(ct));
await Task.Run(async() =>
{
var stopwatch = new Stopwatch();
stopwatch.Start();
await _clientWebSocket.ConnectAsync(new Uri(_uri), ct).ConfigureAwait(false);
stopwatch.Stop();
_logger.LogDebug($"Connection to {_uri} established after {stopwatch.Elapsed.ToString("mm\\:ss\\.ff")}");
_receiveLoopTask = Receive(async stream =>
{
_logger.LogTrace($"Received message stream - beginning processing");
var message = await MessageSerializer.DeserializeAsync <Message>(stream, Encoding.UTF8).ConfigureAwait(false);
_logger.LogTrace($"Received \"{message}\"");
switch (message.MessageType)
{
case MessageType.ConnectionEvent:
_connectionCts.TrySetResult(null);
ConnectionId = message.Data;
Connected?.Invoke();
break;
case MessageType.ClientMethodInvocation:
InvocationDescriptor invocationDescriptor = null;
try
{
invocationDescriptor = MessageSerializer.DeserializeInvocationDescriptor(message.Data, _handlers);
}
catch (Exception exception)
{
await HandleUnparseableReceivedInvocationDescriptor(message.Data, exception).ConfigureAwait(false);
return;
}
if (invocationDescriptor == null)
{
// Valid JSON but unparseable into a known, typed invocation descriptor (unknown method name, invalid parameters)
await HandleInvalidReceivedInvocationDescriptor(message.Data).ConfigureAwait(false);
return;
}
await InvokeOn(invocationDescriptor).ConfigureAwait(false);
break;
case MessageType.InvocationResult:
InvocationResultDescriptor resultDescriptor;
try
{
resultDescriptor = MessageSerializer.DeserializeInvocationResultDescriptor(message.Data, _pendingCalls);
}
catch (Exception exception)
{
await HandleInvalidInvocationResultDescriptor(message.Data, exception).ConfigureAwait(false);
return;
}
HandleInvokeResult(resultDescriptor);
break;
case MessageType.Error:
await HandleErrorMessage(message).ConfigureAwait(false);
break;
}
}, ct);
_receiveLoopTask.ContinueWith(task =>
{
if (task.IsFaulted)
{
Error?.Invoke(task.Exception);
}
});
}, ct).ConfigureAwait(false);
var timeoutTask = Task.Delay(_options.ConnectionTimeout);
await Task.WhenAny(_connectionCts.Task, timeoutTask).ConfigureAwait(false);
if (!ct.IsCancellationRequested && !_connectionCts.Task.IsCompleted && timeoutTask.IsCompleted)
{
throw new TimeoutException($"Connection attempt to {_uri} timed out after {_options.ConnectionTimeout}");
}
}
