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Viewing file:     mux.js (4.36 KB)      -rw-r--r--

'use strict';

var assert = require('assert');
var Mux = require('../lib/mux').Mux;
var PassThrough = require('stream').PassThrough;

var latch = require('./util').latch;
var schedule = require('./util').schedule;

function stream() {
  return new PassThrough({objectMode: true});
}

function readAllObjects(s, cb) {
  var objs = [];

  function read() {
    var v = s.read();
    while (v !== null) {
      objs.push(v);
      v = s.read();
    }
  }

  s.on('end', function() { cb(objs); });
  s.on('readable', read);

  read();
}

test("single input", function(done) {
  var input = stream();
  var output = stream();
  input.on('end', function() { output.end() });

  var mux = new Mux(output);
  mux.pipeFrom(input);

  var data = [1,2,3,4,5,6,7,8,9];
  // not 0, it's treated specially by PassThrough for some reason. By
  // 'specially' I mean it breaks the stream. See e.g.,
  // https://github.com/isaacs/readable-stream/pull/55
  data.forEach(function (chunk) { input.write(chunk); });

  readAllObjects(output, function(vals) {
    assert.deepEqual(data, vals);
    done();
  });

  input.end();
});

test("single input, resuming stream", function(done) {
  var input = stream();
  var output = stream();
  input.on('end', function() { output.end() });

  var mux = new Mux(output);
  mux.pipeFrom(input);

  // Streams might be blocked and become readable again, simulate this
  // using a special read function and a marker
  var data = [1,2,3,4,'skip',6,7,8,9];

  var oldRead  = input.read;
  input.read = function(size) {
    var val = oldRead.call(input, size)

    if (val === 'skip') {
      input.emit('readable');
      return null
    }

    return val;
  }

  data.forEach(function (chunk) { input.write(chunk); });

  readAllObjects(output, function(vals) {
    assert.deepEqual([1,2,3,4,6,7,8,9], vals);
    done();
  });

  input.end();
});

test("two sequential inputs", function(done) {
  var input1 = stream();
  var input2 = stream();
  var output = stream();
  var mux = new Mux(output);
  mux.pipeFrom(input1);
  mux.pipeFrom(input2);

  var data = [1,2,3,4,5,6,7,8,9];
  data.forEach(function(v) { input1.write(v); });

  input1.on('end', function() {
    data.forEach(function (v) { input2.write(v); });
    input2.end();
  });
  input2.on('end', function() { output.end(); });

  input1.end();
  readAllObjects(output, function(vs) {
    assert.equal(2 * data.length, vs.length);
    done();
  });
});

test("two interleaved inputs", function(done) {
  var input1 = stream();
  var input2 = stream();
  var output = stream();
  var mux = new Mux(output);
  mux.pipeFrom(input1);
  mux.pipeFrom(input2);

  var endLatch = latch(2, function() { output.end(); });
  input1.on('end', endLatch);
  input2.on('end', endLatch);

  var data = [1,2,3,4,5,6,7,8,9];
  data.forEach(function(v) { input1.write(v); });
  input1.end();

  data.forEach(function(v) { input2.write(v); });
  input2.end();

  readAllObjects(output, function(vs) {
    assert.equal(2 * data.length, vs.length);
    done();
  });
});

test("unpipe", function(done) {
  var input = stream();
  var output = stream();
  var mux = new Mux(output);

  var pipedData = [1,2,3,4,5];
  var unpipedData = [6,7,8,9];

  mux.pipeFrom(input);

  schedule(function() {
    pipedData.forEach(function (chunk) { input.write(chunk); });

    schedule(function() {
      mux.unpipeFrom(input);

      schedule(function() {
        unpipedData.forEach(function(chunk) { input.write(chunk); });
        input.end();
        schedule(function() {
          // exhaust so that 'end' fires
          var v; while (v = input.read());
        });
      });
    });

  });

  input.on('end', function() {
    output.end();
  });

  readAllObjects(output, function(vals) {
    try {
      assert.deepEqual(pipedData, vals);
      done();
    }
    catch (e) { done(e); }
  });
});

test("roundrobin", function(done) {
  var input1 = stream();
  var input2 = stream();
  var output = stream();
  var mux = new Mux(output);

  mux.pipeFrom(input1);
  mux.pipeFrom(input2);

  var endLatch = latch(2, function() { output.end(); });
  input1.on('end', endLatch);
  input2.on('end', endLatch);

  var ones = [1,1,1,1,1];
  ones.forEach(function(v) { input1.write(v); });
  input1.end();

  var twos = [2,2,2,2,2];
  twos.forEach(function(v) { input2.write(v); });
  input2.end();

  readAllObjects(output, function(vs) {
    assert.deepEqual([1,2,1,2,1,2,1,2,1,2], vs);
    done();
  });

});