[Plugin] Socket.io Client

[getnamo]

@Tyleet;598659

Hi,
thanks for the plugin. It seems I have some trouble getting it to work though. I use the version for UE4.11, socketIO is running on 0.9. I try to connect to socket io with connect node “http://192.168.1.50:5000” then I want to emit a command. The colleague who set up the Server said SocketIO Namespace was “events” and the event I need to send to is called “unityFanSpeedEvent” and receives only a number between 0 and 100.

I guess the problem is the SocketIO namespace, I’m not sure in what node I need to add the namespace (connect or emit?). Sorry if this is some kind of a stupid question, it’s my first time working with socketIO.

Here is what I’m trying to do:
…

So the current plugin is very bare bones, in terms of actual binding meat it’s only 40-50 lines of code, enough to have been done in a short presentation as a proof of concept:

#include "SocketIOClientPrivatePCH.h"
#include "SocketIOClientComponent.h"


USocketIOClientComponent::USocketIOClientComponent(const FObjectInitializer &init) : UActorComponent(init)
{
	bWantsInitializeComponent = true;
	bAutoActivate = true;
}

std::string StdString(FString UEString)
{
	return std::string(TCHAR_TO_UTF8(*UEString));
}
FString FStringFromStd(std::string StdString)
{
	return FString(StdString.c_str());
}


void USocketIOClientComponent::Connect(FString AddressAndPort)
{
	if (!AddressAndPort.IsEmpty())
	{
		PrivateClient.connect(StdString(AddressAndPort));
	}
	else
	{
		PrivateClient.connect("http://localhost:3000");
	}
}

void USocketIOClientComponent::Emit(FString Name, FString Data)
{
	PrivateClient.socket()->emit(StdString(Name), StdString(Data));
	//UE_LOG(LogTemp, Log, TEXT("Emit %s with %s"), *Name, *Data);
}

void USocketIOClientComponent::Bind(FString Name)
{
	PrivateClient.socket()->on(StdString(Name), sio::socket::event_listener_aux(&](std::string const& name, sio::message::ptr const& data, bool isAck, sio::message::list &ack_resp) {

		const FString SafeName = FStringFromStd(name);
		const FString SafeData = FStringFromStd(data->get_string());
		FFunctionGraphTask::CreateAndDispatchWhenReady(&, SafeName, SafeData]
		{
			On.Broadcast(SafeName, SafeData);
		}, TStatId(), nullptr, ENamedThreads::GameThread);
	}));
}

That is literally it. But it’s apparently useful, so I may have to look into extending it a bit

It should be a fairly easy modification to support namespaces. The current code uses

PrivateClient.socket()-> ...

which fetches the default namespace “/” and the method should just expand to add a namespace variable e.g.

FString Namespace = FString(TEXT("events"));
PrivateClient.socket(StdString(Namespace))-> ... 

events.

Feel free to modify the source and make a pull request, otherwise it may take a bit of time before I make a pass on the plugin with the fixes. I’ve added a note about it in github issues on the repo.