Adds a next branch that makes koa-websocket work with koa-router 7.x

[cymen]

This PR resolves issue #14. The root cause of the incompatibility appears to be koa-router 7.x using a newer version of koa-compose that doesn't function the same. I upgraded koa-compose and changed how the result of the composition was called -- it looks like explicit context passing instead of binding the context is the newer approach?

Because I couldn't seem to maintain koa 1.x compatibility, I guessed this should be a next kind of thing for koa-websocket.

[cymen]

Hrm... I couldn't figure out how to open this PR to next on your repo. Maybe the branch has to exist? If so and you want this PR as next, can you branch off your master and push it up as next and I can change the target of this PR to it?

[kudos]

Thanks! I'll push a pre-release 3.0.0 bump to npm for this shortly.

[cymen]

@kudos Thanks!

[ralyodio]

awesome! been waiting for this for a couple of months.

[ralyodio]

I still only see 2.1.1 on npm. Did you ever push this pre-release to npm?

[kudos]

@chovy it's tagged next not latest on NPM. If you npm install koa-websocket@next you'll get 3.0.1 instead. When Koa moves 2.0 from next to latest I'll move koa-websocket too.

[ralyodio]

Gotcha. Thanks. I figured npm page would have shown an @next if it were available somewhere.

I think koa is waiting for async/await to not need a flag before it becomes stable. Probably April from what I hear.

[AaronHarris]

As of Node 7.6, a flag is not needed for async/await, and Koa now ships v2 as the @latest when installing.

[jiacai2050]

  "dependencies": {
    "koa": "^2.2.0",
    "koa-ejs": "^4.0.0",
    "koa-router": "^7.2.0",
    "koa-static": "^3.0.0",
    "koa-websocket": "^4.0.0"
  }

With above dependencies, websocket router is still not working.

router.get('/ws', async (ctx) => {
  console.log(ctx)
  ctx.websocket.send('Hello World');
  ctx.websocket.on('message', function (message) {
    // do something with the message from client
    console.log(message);
    ctx.websocket.send(message);
  });
});

[lennerd]

Same for me.

[jiacai2050]

const ws = require('koa-router')();
const websockify = require('koa-websocket');
const Koa = require('koa');

let app = new Koa()
let sock = websockify(app);

ws.get('/ping', async (ctx) => {
    ctx.websocket.on('message', (message) => {
        console.log(message);
        ctx.websocket.send(message);
    });
});
app.ws.use(ws.routes()).use(ws.allowedMethods());
app.listen(3000);

@lennerd Above snippets work for me.

[lennerd]

Yes, I was able to get it working, too. Had problems with koa-session, but this is solved now. Thanks for the snippet!