async Task EnsureServerInitializedAsync()
{
if (this.ServerAddress != null)
{
return;
}
int threadCount = Environment.ProcessorCount;
var executorGroup = new MultithreadEventLoopGroup(threadCount);
var bufAllocator = new PooledByteBufferAllocator(16 * 1024, 10 * 1024 * 1024 / threadCount); // reserve 10 MB for 64 KB buffers
BlobSessionStatePersistenceProvider sessionStateProvider = await BlobSessionStatePersistenceProvider.CreateAsync(
this.settingsProvider.GetSetting("BlobSessionStatePersistenceProvider.StorageConnectionString"),
this.settingsProvider.GetSetting("BlobSessionStatePersistenceProvider.StorageContainerName"));
TableQos2StatePersistenceProvider qos2StateProvider = await TableQos2StatePersistenceProvider.CreateAsync(
this.settingsProvider.GetSetting("TableQos2StatePersistenceProvider.StorageConnectionString"),
this.settingsProvider.GetSetting("TableQos2StatePersistenceProvider.StorageTableName"));
var settings = new Settings(this.settingsProvider);
var authProvider = new SasTokenDeviceIdentityProvider();
var topicNameRouter = new ConfigurableMessageRouter();
IotHubClientFactoryFunc iotHubClientFactoryMethod = IotHubClient.PreparePoolFactory(settings.IotHubConnectionString + ";DeviceId=stub", "a", 1);
var iotHubFactory = new IotHubCommunicationFactory(iotHubClientFactoryMethod);
ServerBootstrap server = new ServerBootstrap()
.Group(executorGroup)
.Channel <TcpServerSocketChannel>()
.ChildOption(ChannelOption.Allocator, bufAllocator)
.ChildOption(ChannelOption.AutoRead, false)
.ChildHandler(new ActionChannelInitializer <IChannel>(ch =>
{
ch.Pipeline.AddLast(TlsHandler.Server(this.tlsCertificate));
ch.Pipeline.AddLast(
MqttEncoder.Instance,
new MqttDecoder(true, 256 * 1024),
new LoggingHandler(),
new MqttIotHubAdapter(
settings,
sessionStateProvider,
authProvider,
qos2StateProvider,
iotHubFactory,
topicNameRouter),
new XUnitLoggingHandler(this.output));
}));
IChannel serverChannel = await server.BindAsync(IPAddress.Any, this.ProtocolGatewayPort);
this.ScheduleCleanup(async() =>
{
await serverChannel.CloseAsync();
await executorGroup.ShutdownGracefullyAsync();
});
this.ServerAddress = IPAddress.Loopback;
}
public static IotHubClientFactoryFunc PreparePoolFactory(string baseConnectionString, string poolId, int connectionPoolSize, TimeSpan?connectionIdleTimeout)
{
IotHubConnectionStringBuilder csb = IotHubConnectionStringBuilder.Create(baseConnectionString);
IotHubClientFactoryFunc iotHubClientFactory = deviceIdentity =>
{
var identity = (IotHubDeviceIdentity)deviceIdentity;
csb.AuthenticationMethod = DeriveAuthenticationMethod(csb.AuthenticationMethod, identity);
csb.HostName = identity.IotHubHostName;
string connectionString = csb.ToString();
return(CreateFromConnectionStringAsync(connectionString, connectionPoolSize, connectionIdleTimeout));
};
return(iotHubClientFactory);
}
public static IotHubClientFactoryFunc PreparePoolFactory(string baseConnectionString, string poolId, int connectionPoolSize)
{
IotHubConnectionStringBuilder csb = IotHubConnectionStringBuilder.Create(baseConnectionString);
// todo: uncommment once explicit control over connection pooling is available
//string[] connectionIds = Enumerable.Range(1, connectionPoolSize).Select(index => poolId + index).ToArray();
int connectionIndex = 0;
IotHubClientFactoryFunc iotHubClientFactory = deviceIdentity =>
{
//if (++connectionIndex >= connectionPoolSize)
//{
// connectionIndex = 0;
//}
//csb.GroupName = connectionIds[connectionIndex]; // todo: uncommment once explicit control over connection pooling is available
var identity = (IotHubDeviceIdentity)deviceIdentity;
csb.AuthenticationMethod = DeriveAuthenticationMethod(csb.AuthenticationMethod, identity);
csb.HostName = identity.IotHubHostName;
string connectionString = csb.ToString();
return(CreateFromConnectionStringAsync(connectionString));
};
return(iotHubClientFactory);
}
public IotHubCommunicationFactory(IotHubClientFactoryFunc iotHubClientFactoryMethod)
{
this.iotHubClientFactoryMethod = iotHubClientFactoryMethod;
}