addEventListener support for Reader

[drzraf]

Couldn't the reader returned by getReader() implement the FileReader interface or is there another way to "track" reader progress outside a while loop?

var { message } = await openpgp.encrypt({
        message: openpgp.message.fromBinary((new File([], "foo.txt")).stream()),
        publicKeys: [KEYS],
        armor: false
    }),
_reader = openpgp.stream.getReader(message.packets.write());
_reader.addEventListener('progress', event => console.log(`${event.type}: ${event.loaded} bytes transferred`));

[twiss]

There's no easy way, but.. note that if you put the while loop in an async IIFE:

(async () => {
  for (let chunk; chunk = await reader.readBytes(1 << 20);) console.log(chunk);
  console.log('finished');
})();

then that's pretty similar to having two events, and you're not blocking the outer function's control flow.

If you truly don't want a while loop, you could use stream.transform:

openpgp.stream.transform(message.packets.write(), chunk => {
  console.log(chunk);
}, () => {
  console.log('finished');
});

but it's not really meant for this, and it will create an extra TransformStream object which you don't need.