Synchronous request with Websockets

Question

I can send and receive messages from server on websockets. I need to write a function that will send data to the server and is awaiting a response from the server and then r

Answer 1

You should use some sort of RPC protocol on top of WebSockets. I suggest you take a look at WAMP which is a WebSocket sub-protocol that adds RPC and PUB/SUB semantics. It includes a client library which abstracts the async connection to some extent by giving you a promise based API.

Here is an example:

var wsuri = "ws://localhost:9000";

ab.connect(wsuri, function (session) {
    session.call("http://example.com/simple/calc#add", 23, 7).then(
        function (res) {
            console.log("got result: " + res);
        },
        function (error, desc) {
            console.log("error: " + desc);
        }
    );
});

There are a number of server-side implementations for this.