Can I use redstone with shelf webSocket handler

[Holger Koser]

Hi Luiz,

I have tried to use the redstone with the shelf_web_socket 

(see my gist https://gist.github.com/holgerkoser/a6657ece3d51876cee28)

The first problem I see is that _target is null because the handler is the _finalHandler.

The second problem I have is that _handleMessage forwards the HiJackException. I think it should be ignored as in shelf_io.

I also tried to setup the handler via Interceptors but I get similar problems.

Best regards, Holger

[Luiz Mineo]

Hi Holger,

Thanks! I've published a new version (0.5.9) with a fix for this issue. Can you try it again?

Best regards,

Luiz.

[Holger Koser]

Hi Luiz,

I can confirm that your fix solves the problem.

It also seems to solve the problem I had with WebSocket using Interceptors. 

See https://gist.github.com/holgerkoser/dcec01864c44240bb8eb.

What do you think is the best way to handle websocket connections?

Thanks, Holger

[Luiz Mineo]

Both seems fine. Although, if you want to restrict the websocket handler to a specific url, without using an interceptor, you can wrap it in another handler. Example:

var websocketHandler = webSocketHandler((webSocket) {

  webSocket.listen((message) {

    print('Server: ' + message);

    webSocket.add('pong');

  });

});

 

void main() {

  app.setupConsoleLog();

  

  app.setShelfHandler((req) {

    if (req.url.path.startsWith("/ws")) {

      return websocketHandler(req);

    }

    return new shelf.Response.notFound("not_found");

  });

  

  app.start();

}  

You can also wrap more than one handler. For example, if you want to use shelf_web_socket and shelf_static:

var websocketHandler = webSocketHandler((webSocket) {

  webSocket.listen((message) {

    print('Server: ' + message);

    webSocket.add('pong');

  });

});

var staticHandler = createStaticHandler("/web");

 

void main() {

  app.setupConsoleLog();

  

  app.setShelfHandler((req) {

    if (req.url.path.startsWith("/ws")) {

      return websocketHandler(req);

    }

    return staticHandler(req);

  });

  

  app.start();

[Luiz Mineo]

If you are still interested in using websockets in Redstone, there is now a redstone_web_socket plugin available on pub, that provides a better integration with shelf_web_socket.