peer-emitter/tests/utils/duplex-pair.js

acknowledgeable events

var through = require('through');
var duplexer = require('duplexer');

module.exports = DuplexPair;

function DuplexPair(debug) {

  function log(who) {
    return function(data) {
      if (debug)
        console.log('\'%s\' sending \'%s\'', who, data.replace(/\n/g, ''));
      this.queue(data);
    };
  }

  var aWriteStream = through(log('a'));
  var bWriteStream = through(log('b'));

  var streamA = duplexer(bWriteStream, aWriteStream);
  var streamB = duplexer(aWriteStream, bWriteStream);

  return {
    a: streamA,
    b: streamB
  };
}