insomnia-node-libcurl/examples/multi-interface.js

Node bindings for libcurl. Based on the work from node-curl.

/**
 * @author Jonathan Cardoso Machado
 * @license MIT
 * @copyright 2015-2016, Jonathan Cardoso Machado
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
 * of the Software, and to permit persons to whom the Software is furnished to do
 * so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

/**
 * Example showing how to use the Multi handle to make async requests.
 */
var Easy = require('../lib/Easy'),
  Multi = require('../lib/Multi'),
  urls = ['http://google.com', 'http://bing.com', 'http://msn.com', 'http://ask.com/'],
  multi = new Multi(),
  finished = 0,
  handles = [],
  handlesData = [],
  handle;

multi.onMessage(function(err, handle, errCode) {
  var responseCode = handle.getInfo('RESPONSE_CODE').data,
    handleData = handlesData[handles.indexOf(handle)],
    handleUrl = urls[handles.indexOf(handle)],
    responseData = '',
    i,
    len;

  console.log('# of handles active: ' + multi.getCount());

  if (err) {
    console.log(handleUrl + ' returned error: "' + err.message + '" with errcode: ' + errCode);
  } else {
    for (i = 0, len = handleData.length; i < len; i++) {
      responseData += handleData[i].toString();
    }

    console.log(handleUrl + ' returned response code: ' + responseCode);

    console.log(handleUrl + ' returned response body: ' + responseData);
  }

  multi.removeHandle(handle);
  handle.close();

  if (++finished === urls.length) {
    console.log('Finished all requests!');
    multi.close();
  }
});

/**
 * @param {Buffer} data
 * @param {Number} n
 * @param {Number} nmemb
 * @returns {number}
 */
function onData(data, n, nmemb) {
  //this === the handle
  var key = handles.indexOf(this);

  handlesData[key].push(data);

  return n * nmemb;
}

for (var i = 0, len = urls.length; i < len; i++) {
  handle = new Easy();
  handle.setOpt('URL', urls[i]);
  handle.setOpt('FOLLOWLOCATION', true);
  handle.setOpt('WRITEFUNCTION', onData);

  handlesData.push([]);
  handles.push(handle);

  multi.addHandle(handle);
}