uWebSockets.js/src/WebSocketWrapper.h

#include "App.h"
#include <v8.h>
#include "Utilities.h"
using namespace v8;

/* todo: probably isCorked, cork should be exposed? */

struct WebSocketWrapper {
    static Persistent<Object> wsTemplate[2];

    template <bool SSL>
    static inline uWS::WebSocket<SSL, true> *getWebSocket(const FunctionCallbackInfo<Value> &args) {
        auto *ws = (uWS::WebSocket<SSL, true> *) args.Holder()->GetAlignedPointerFromInternalField(0);
        if (!ws) {
            args.GetReturnValue().Set(isolate->ThrowException(String::NewFromUtf8(isolate, "Invalid access of closed uWS.WebSocket/SSLWebSocket.")));
        }
        return ws;
    }

    static inline void invalidateWsObject(const FunctionCallbackInfo<Value> &args) {
        args.Holder()->SetAlignedPointerInInternalField(0, nullptr);
    }

    /* Takes string topic */
    template <bool SSL>
    static void uWS_WebSocket_subscribe(const FunctionCallbackInfo<Value> &args) {
        auto *ws = getWebSocket<SSL>(args);
        if (ws) {
            NativeString topic(isolate, args[0]);
            ws->subscribe(topic.getString());
        }
    }

    /* Takes string topic, message */
    template <bool SSL>
    static void uWS_WebSocket_publish(const FunctionCallbackInfo<Value> &args) {
        auto *ws = getWebSocket<SSL>(args);
        if (ws) {
            NativeString topic(isolate, args[0]);
            NativeString message(isolate, args[1]);
            ws->publish(topic.getString(), message.getString());
        }
    }

    /* It would make sense to call terminate "close" and call close "end" to line up with HTTP */
    /* That also makes sense seince close takes message and code -> you can end with a string message */

    /* Takes nothing returns nothing */
    template <bool SSL>
    static void uWS_WebSocket_close(const FunctionCallbackInfo<Value> &args) {
        auto *ws = getWebSocket<SSL>(args);
        if (ws) {
            invalidateWsObject(args);
            ws->close();
        }
    }

    /* Takes code, message, returns undefined */
    template <bool SSL>
    static void uWS_WebSocket_end(const FunctionCallbackInfo<Value> &args) {
        auto *ws = getWebSocket<SSL>(args);
        if (ws) {
            int code = 0;
            if (args.Length() >= 1) {
                code = args[0]->Uint32Value();
            }

            NativeString message(args.GetIsolate(), args[1]);
            if (message.isInvalid(args)) {
                return;
            }

            invalidateWsObject(args);
            ws->end(code, message.getString());
        }
    }

    /* Takes nothing, returns integer */
    template <bool SSL>
    static void uWS_WebSocket_getBufferedAmount(const FunctionCallbackInfo<Value> &args) {
        auto *ws = getWebSocket<SSL>(args);
        if (ws) {
            int bufferedAmount = ws->getBufferedAmount();
            args.GetReturnValue().Set(Integer::New(isolate, bufferedAmount));
        }
    }

    /* Takes message, isBinary. Returns true on success, false otherwise */
    template <bool SSL>
    static void uWS_WebSocket_send(const FunctionCallbackInfo<Value> &args) {
        auto *ws = getWebSocket<SSL>(args);
        if (ws) {
            NativeString message(args.GetIsolate(), args[0]);
            if (message.isInvalid(args)) {
                return;
            }

            bool ok = ws->send(message.getString(), args[1]->BooleanValue() ? uWS::OpCode::BINARY : uWS::OpCode::TEXT);

            args.GetReturnValue().Set(Boolean::New(isolate, ok));
        }
    }

    template <bool SSL>
    static void initWsTemplate() {
        Local<FunctionTemplate> wsTemplateLocal = FunctionTemplate::New(isolate);
        if (SSL) {
            wsTemplateLocal->SetClassName(String::NewFromUtf8(isolate, "uWS.SSLWebSocket"));
        } else {
            wsTemplateLocal->SetClassName(String::NewFromUtf8(isolate, "uWS.WebSocket"));
        }
        wsTemplateLocal->InstanceTemplate()->SetInternalFieldCount(1);

        /* Register our functions */
        wsTemplateLocal->PrototypeTemplate()->Set(String::NewFromUtf8(isolate, "send"), FunctionTemplate::New(isolate, uWS_WebSocket_send<SSL>));
        wsTemplateLocal->PrototypeTemplate()->Set(String::NewFromUtf8(isolate, "end"), FunctionTemplate::New(isolate, uWS_WebSocket_end<SSL>));
        wsTemplateLocal->PrototypeTemplate()->Set(String::NewFromUtf8(isolate, "close"), FunctionTemplate::New(isolate, uWS_WebSocket_close<SSL>));
        wsTemplateLocal->PrototypeTemplate()->Set(String::NewFromUtf8(isolate, "getBufferedAmount"), FunctionTemplate::New(isolate, uWS_WebSocket_getBufferedAmount<SSL>));
        wsTemplateLocal->PrototypeTemplate()->Set(String::NewFromUtf8(isolate, "subscribe"), FunctionTemplate::New(isolate, uWS_WebSocket_subscribe<SSL>));
        wsTemplateLocal->PrototypeTemplate()->Set(String::NewFromUtf8(isolate, "publish"), FunctionTemplate::New(isolate, uWS_WebSocket_publish<SSL>));

        /* Create the template */
        Local<Object> wsObjectLocal = wsTemplateLocal->GetFunction()->NewInstance(isolate->GetCurrentContext()).ToLocalChecked();
        wsTemplate[SSL].Reset(isolate, wsObjectLocal);
    }

    /* This is where we output an instance */
    template <class APP>
    static Local<Object> getWsInstance() {
        return Local<Object>::New(isolate, wsTemplate[std::is_same<APP, uWS::SSLApp>::value])->Clone();
    }
};

/* Fix this, should be nicer */
Persistent<Object> WebSocketWrapper::wsTemplate[2];