RPC with promises for node.js [closed]

Question

Are there any RPC modules which work with promises?

On the server I have functions which return promises. I would like to expose them for browser clients to call over websockts or fallbacks. I found some RPC libraries for example dnode, but they expect a callback as parameter.

I would like something like this:

Server:

rpc.expose({
    timeout: function (time) {
        var d = Q.defer();
        setTimeout(function () {
            d.resolve();
        }, time);
        return d.promise;
    }
});

Client:

rpc.timeout(2000).then(function() {
    console.log('done');
});

Answer 1

I've written an RPC implementation called Wildcard API that lets you do just that:

// Node.js server

const { server } = require('@wildcard-api/server');

// We define a `timeout` function on the server
server.timeout = function({seconds}) {
  await sleep({seconds});
};

function sleep({seconds}) {
  return new Promise(resolve => setTimeout(resolve, seconds * 1000));
}

// Browser

import { server } from '@wildcard-api/client';

(async () => {
  // Wildcard makes our `timeout` function available in the browser
  await server.timeout({seconds: 2});
  // 2 seconds later...
  console.log('done');
})();