Gio.InputStream (and friends)

[Andrea Giammarchi <andrea giammarchi gmail com>]

I am trying to implement a stream module and apparently I have everything I need but practically I'm unable to use streams.

If I instantiate a `new Gio.InputStream` I have the following error:

cannot create instance of abstract (non-instantiatable) type 'GInputStream'

I cannot even extend it ... so I've though "ok, maybe it's like an interface, I implement it and that's it"

But then a JS class wouldn't work as base_stream for a Gio.BufferedInputStream, and if I extend the JS class to be a GObject.Object then:

Gjs-WARNING **: JS ERROR: TypeError: Object is of type GObject.Object - cannot convert to GInputStream

where GInputStream is the one I cannot use in the first place.

I've reached full circle then so ... I wonder if anyone has any idea how to use/create/extend streams in GJS (not talking about file streams but streams in general) or if it's even possible.

In node, as example, I could do this and it will work:

```js

const { Readable } = require('stream');

class Counter extends Readable {

constructor(opt) {

super(opt);

this._max = 1000;

this._index = 1;

}

_read() {

const i = this._index++;

if (i > this._max)

this.push(null);

else {

const str = '' + i;

const buf = Buffer.from(str, 'ascii');

this.push(buf);

}

}

}

(new Counter).on('data', console.log);

```