// register connection with requested RPC managers
private async Task UpgradeAsync(IConnection connection)
{
foreach (var manager in _managers.Values)
{
if (await Authorizations.AuthorizeControllerAsync(_authorization, manager.SubType, connection.Context.User))
{
manager.Upgrade(connection);
}
}
var readyMessage = new JObject();
var controllers =
from manager in _managers.Values
select manager.Name;
readyMessage.Add("Controllers", JToken.FromObject(controllers));
var routes =
from manager in _managers.Values
from action in manager.Actions
select new { Controller = manager.Name, Action = action.Key };
readyMessage.Add("Routes", JToken.FromObject(routes));
await connection.Send(readyMessage);
}
// route a remote call to the appropriate action
private async Task HandleMessageAsync(IConnection connection)
{
// get next message
var message = await connection.Receive();
// extract controller name and action name from message
var controllerName = message.Value <string>("Controller");
var actionName = message.Value <string>("Action");
if (controllerName == null || actionName == null)
{
_logger.LogWarning("RPC call failed because of malformed message");
return;
}
// get specified controller type
IRPCManager manager;
if (!_managers.TryGetValue(controllerName, out manager))
{
_logger.LogWarning($"RPC call [{controllerName}] failed because no such manager existed ");
return;
}
// get specified action method info
MethodInfo actionMethod;
if (!manager.Actions.TryGetValue(actionName, out actionMethod))
{
_logger.LogWarning($"RPC call [{controllerName}.{actionName}] failed because no such action existed ");
return;
}
// check authorization
bool authorized = await Authorizations.AuthorizeControllerAsync(_authorization, manager.SubType, connection.Context.User);
if (!authorized)
{
_logger.LogWarning($"RPC call [{controllerName}.{actionName}] failed because user wasn't authorized");
return;
}
authorized = await Authorizations.AuthorizeActionAsync(_authorization, actionMethod, connection.Context.User);
if (!authorized)
{
_logger.LogWarning($"RPC call [{controllerName}.{actionName}] failed because user wasn't authorized");
return;
}
// extract the method parameters
object[] parameters;
if (!TryExtractParameters(message, actionMethod, out parameters))
{
_logger.LogWarning($"RPC call [{controllerName}.{actionName}] failed because invalid parameters were sent");
return;
}
// create a new controller instance
var descriptor = new ControllerActionDescriptor();
descriptor.ControllerTypeInfo = manager.SubType.GetTypeInfo();
descriptor.RouteValues["controller"] = controllerName;
descriptor.RouteValues["action"] = actionName;
var actionContext = new ActionContext(connection.Context, new RouteData(), descriptor);
var controllerContext = new ControllerContext(actionContext);
var controller = _factory.CreateController(controllerContext);
if (controller == null)
{
_logger.LogWarning($"RPC call failed, because {controllerName} Controller could not be created");
return;
}
// call the action
try
{
actionMethod.Invoke(controller, parameters);
}
catch (Exception ex)
{
_logger.LogError($"RPC Connection failed call to {controllerName}.{actionName}, because of exception: {ex.Message}");
return;
}
finally
{
_factory.ReleaseController(controllerContext, controller);
}
}