async AsyncTask TryOpenPrioritizedTransportsAsync()
{
Exception lastException = null;
// Concrete Device Client creation was deferred. Use prioritized list of transports.
foreach (var transportSetting in this.transportSettings)
{
TransportHandlerBase helper;
try
{
switch (transportSetting.GetTransportType())
{
case TransportType.Amqp_WebSocket_Only:
case TransportType.Amqp_Tcp_Only:
helper = new AmqpTransportHandler(this.iotHubConnectionString, transportSetting as AmqpTransportSettings);
break;
case TransportType.Http1:
helper = new HttpTransportHandler(this.iotHubConnectionString, transportSetting as Http1TransportSettings);
break;
case TransportType.Mqtt:
helper = new MqttTransportHandler(this.iotHubConnectionString, transportSetting as MqttTransportSettings);
break;
default:
throw new InvalidOperationException("Unsupported Transport Setting {0}".FormatInvariant(transportSetting));
}
// Try to open a connection with this transport
await helper.OpenAsync();
}
catch (Exception exception)
{
if (exception.IsFatal() || exception is UnauthorizedException || exception is InvalidOperationException)
{
throw;
}
lastException = exception;
// open connection failed. Move to next transport type
continue;
}
// Success - return this transport type
this.impl = helper;
this.TransportTypeInUse = transportSetting.GetTransportType();
return;
}
throw lastException;
}
async Task TryOpenPrioritizedTransportsAsync()
{
Exception lastException = null;
// Concrete Device Client creation was deferred. Use prioritized list of transports.
foreach (var transportSetting in this.transportSettings)
{
TransportHandlerBase helper = null;
try
{
switch (transportSetting.GetTransportType())
{
case TransportType.Amqp_WebSocket_Only:
case TransportType.Amqp_Tcp_Only:
helper = new AmqpTransportHandler(this.iotHubConnectionString, transportSetting as AmqpTransportSettings);
break;
case TransportType.Http1:
helper = new HttpTransportHandler(this.iotHubConnectionString, transportSetting as Http1TransportSettings);
break;
#if !WINDOWS_UWP
case TransportType.Mqtt:
helper = new MqttTransportHandler(this.iotHubConnectionString, transportSetting as MqttTransportSettings);
break;
#endif
default:
throw new InvalidOperationException("Unsupported Transport Setting {0}".FormatInvariant(transportSetting));
}
// Try to open a connection with this transport
await helper.OpenAsync();
}
catch (Exception exception)
{
await helper.CloseAsync();
#if WINDOWS_UWP
// UWP does not use sockets
if (!(exception is IotHubCommunicationException || exception is TimeoutException || exception is AggregateException))
#else
if (!(exception is IotHubCommunicationException || exception is TimeoutException || exception is SocketException || exception is AggregateException))
#endif
{
throw;
}
if (exception is AggregateException)
{
var aggregateException = (AggregateException)exception;
var innerExceptions = aggregateException.Flatten().InnerExceptions;
#if WINDOWS_UWP
if (!innerExceptions.Any(x => x is IotHubCommunicationException || x is TimeoutException))
#else
if (!innerExceptions.Any(x => x is IotHubCommunicationException || x is SocketException || x is TimeoutException))
#endif
{
throw;
}
}
lastException = exception;
// open connection failed. Move to next transport type
continue;
}
// Success - return this transport type
this.impl = helper;
this.TransportTypeInUse = transportSetting.GetTransportType();
return;
}
throw lastException;
}