Acme.BookStore.HttpApi.Host/node_modules/ordered-read-streams/index.js

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var Readable = require('readable-stream/readable');
var util = require('util');

function isReadable(stream) {
  if (typeof stream.pipe !== 'function') {
    return false;
  }

  if (!stream.readable) {
    return false;
  }

  if (typeof stream._read !== 'function') {
    return false;
  }

  if (!stream._readableState) {
    return false;
  }

  return true;
}

function addStream (streams, stream) {
  if (!isReadable(stream)) {
    throw new Error('All input streams must be readable');
  }

  var self = this;

  stream._buffer = [];

  stream.on('readable', function () {
    var chunk = stream.read();
    while (chunk) {
      if (this === streams[0]) {
        self.push(chunk);
      } else {
        this._buffer.push(chunk);
      }
      chunk = stream.read();
    }
  });

  stream.on('end', function () {
    for (var stream = streams[0];
      stream && stream._readableState.ended;
      stream = streams[0]) {
      while (stream._buffer.length) {
        self.push(stream._buffer.shift());
      }

      streams.shift();
    }

    if (!streams.length) {
      self.push(null);
    }
  });