src/streamer/network-streamer.js

/**
 * @file Network Streamer
 * @author Alexander Rose <alexander.rose@weirdbyte.de>
 * @private
 */
 
import Streamer from './streamer.js'
 
class NetworkStreamer extends Streamer {
  get type () { return 'network' }
 
  get __srcName () { return 'url' }
 
  _read (callback) {
    let url = this.src
 
    if (typeof importScripts === 'function') {
        // FIXME
        // adjust relative path when inside a web worker
      if (url.substr(0, 3) === '../') url = '../' + url
    }
 
    const xhr = new window.XMLHttpRequest()
    xhr.open('GET', url, true)
 
    //
 
    xhr.addEventListener('load', function () {
      if (xhr.status === 200 || xhr.status === 304 ||
            // when requesting from local file system
            // the status in Google Chrome/Chromium is 0
            xhr.status === 0
        ) {
        try {
          callback(xhr.response)
        } catch (e) {
          this.onerror(e)
        }
      } else {
        if (typeof this.onerror === 'function') {
          this.onerror(xhr.status)
        }
 
        throw new Error('NetworkStreamer._read: status code ' + xhr.status)
      }
    }.bind(this), false)
 
    //
 
    // if( typeof this.onprogress === "function" ){
 
    //     xhr.addEventListener( 'progress', function ( event ) {
 
    //         this.onprogress( event );
 
    //     }.bind( this ), false );
 
    // }
 
    //
 
    if (typeof this.onerror === 'function') {
      xhr.addEventListener('error', function (event) {
        this.onerror(event)
      }.bind(this), false)
    }
 
    //
 
    if (this.isBinary()) {
      xhr.responseType = 'arraybuffer'
    } else if (this.json) {
      xhr.responseType = 'json'
    } else if (this.xml) {
      xhr.responseType = 'document'
    } else {
      xhr.responseType = 'text'
    }
    // xhr.crossOrigin = true;
 
    xhr.send(null)
 
    // try {
    //     xhr.send( null );
    // }catch( e ){
    //     if( typeof this.onerror === "function" ){
    //         this.onerror( e.message );
    //     }
    // }
  }
}
 
export default NetworkStreamer