private async Task Invoke(HubMethodDescriptor descriptor, HubConnectionContext connection,
HubMethodInvocationMessage hubMethodInvocationMessage, bool isStreamedInvocation)
{
var methodExecutor = descriptor.MethodExecutor;
using (var scope = _serviceScopeFactory.CreateScope())
{
if (!await IsHubMethodAuthorized(scope.ServiceProvider, connection.User, descriptor.Policies))
{
_logger.HubMethodNotAuthorized(hubMethodInvocationMessage.Target);
await SendInvocationError(hubMethodInvocationMessage, connection,
$"Failed to invoke '{hubMethodInvocationMessage.Target}' because user is unauthorized");
return;
}
if (!await ValidateInvocationMode(methodExecutor.MethodReturnType, isStreamedInvocation, hubMethodInvocationMessage, connection))
{
return;
}
var hubActivator = scope.ServiceProvider.GetRequiredService <IHubActivator <THub> >();
var hub = hubActivator.Create();
try
{
InitializeHub(hub, connection);
var result = await ExecuteHubMethod(methodExecutor, hub, hubMethodInvocationMessage.Arguments);
if (isStreamedInvocation)
{
var enumerator = GetStreamingEnumerator(connection, hubMethodInvocationMessage.InvocationId, methodExecutor, result, methodExecutor.MethodReturnType);
_logger.StreamingResult(hubMethodInvocationMessage.InvocationId, methodExecutor.MethodReturnType.FullName);
await StreamResultsAsync(hubMethodInvocationMessage.InvocationId, connection, enumerator);
}
// Non-empty/null InvocationId ==> Blocking invocation that needs a response
else if (!string.IsNullOrEmpty(hubMethodInvocationMessage.InvocationId))
{
_logger.SendingResult(hubMethodInvocationMessage.InvocationId, methodExecutor.MethodReturnType.FullName);
await SendMessageAsync(connection, CompletionMessage.WithResult(hubMethodInvocationMessage.InvocationId, result));
}
}
catch (TargetInvocationException ex)
{
_logger.FailedInvokingHubMethod(hubMethodInvocationMessage.Target, ex);
await SendInvocationError(hubMethodInvocationMessage, connection, ex.InnerException.Message);
}
catch (Exception ex)
{
_logger.FailedInvokingHubMethod(hubMethodInvocationMessage.Target, ex);
await SendInvocationError(hubMethodInvocationMessage, connection, ex.Message);
}
finally
{
hubActivator.Release(hub);
}
}
}
private void DiscoverHubMethods()
{
var hubType = typeof(THub);
var hubTypeInfo = hubType.GetTypeInfo();
foreach (var methodInfo in HubReflectionHelper.GetHubMethods(hubType))
{
var methodName = methodInfo.Name;
if (_methods.ContainsKey(methodName))
{
throw new NotSupportedException($"Duplicate definitions of '{methodName}'. Overloading is not supported.");
}
var executor = ObjectMethodExecutor.Create(methodInfo, hubTypeInfo);
var authorizeAttributes = methodInfo.GetCustomAttributes <AuthorizeAttribute>(inherit: true);
_methods[methodName] = new HubMethodDescriptor(executor, authorizeAttributes);
_logger.HubMethodBound(methodName);
}
}
private async Task Invoke(HubMethodDescriptor descriptor, HubConnectionContext connection, InvocationMessage invocationMessage)
{
var methodExecutor = descriptor.MethodExecutor;
using (var scope = _serviceScopeFactory.CreateScope())
{
if (!await IsHubMethodAuthorized(scope.ServiceProvider, connection.User, descriptor.Policies))
{
_logger.HubMethodNotAuthorized(invocationMessage.Target);
if (!invocationMessage.NonBlocking)
{
await SendMessageAsync(connection, CompletionMessage.WithError(invocationMessage.InvocationId, $"Failed to invoke '{invocationMessage.Target}' because user is unauthorized"));
}
return;
}
var hubActivator = scope.ServiceProvider.GetRequiredService <IHubActivator <THub> >();
var hub = hubActivator.Create();
try
{
InitializeHub(hub, connection);
object result = null;
// ReadableChannel is awaitable but we don't want to await it.
if (methodExecutor.IsMethodAsync && !IsChannel(methodExecutor.MethodReturnType, out _))
{
if (methodExecutor.MethodReturnType == typeof(Task))
{
await(Task) methodExecutor.Execute(hub, invocationMessage.Arguments);
}
else
{
result = await methodExecutor.ExecuteAsync(hub, invocationMessage.Arguments);
}
}
else
{
result = methodExecutor.Execute(hub, invocationMessage.Arguments);
}
if (IsStreamed(connection, invocationMessage.InvocationId, methodExecutor, result, methodExecutor.MethodReturnType, out var enumerator))
{
_logger.StreamingResult(invocationMessage.InvocationId, methodExecutor.MethodReturnType.FullName);
await StreamResultsAsync(invocationMessage.InvocationId, connection, enumerator);
}
else if (!invocationMessage.NonBlocking)
{
_logger.SendingResult(invocationMessage.InvocationId, methodExecutor.MethodReturnType.FullName);
await SendMessageAsync(connection, CompletionMessage.WithResult(invocationMessage.InvocationId, result));
}
}
catch (TargetInvocationException ex)
{
_logger.FailedInvokingHubMethod(invocationMessage.Target, ex);
await SendInvocationError(invocationMessage, connection, methodExecutor.MethodReturnType, ex.InnerException);
}
catch (Exception ex)
{
_logger.FailedInvokingHubMethod(invocationMessage.Target, ex);
await SendInvocationError(invocationMessage, connection, methodExecutor.MethodReturnType, ex);
}
finally
{
hubActivator.Release(hub);
}
}
}