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wb-download-file.js 1.7KB

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  1. //
  2. // Copyright (C) Stanislaw Adaszewski, 2020
  3. // Contact: s.adaszewski@gmail.com
  4. // Website: https://adared.ch/wba
  5. // License: GNU Affero General Public License, Version 3
  6. //
  7. import makeArvadosRequest from 'make-arvados-request';
  8. function wbDownloadFile(arvHost, arvToken,
  9. manifestReader, path) {
  10. const file = manifestReader.getFile(path);
  11. const name = path.split('/').reverse()[0];
  12. const blockRefs = file[0];
  13. let prom = makeArvadosRequest(arvHost, arvToken,
  14. '/arvados/v1/keep_services');
  15. prom = prom.then(xhr => {
  16. const services = xhr.response['items'];
  17. const proxies = services.filter(svc => (svc.service_type === 'proxy'));
  18. const n = Math.floor(Math.random() * proxies.length);
  19. const proxy = proxies[n];
  20. const blocks = [];
  21. let prom_2 = new Promise(accept => accept());
  22. for (let i = 0; i < blockRefs.length; i++) {
  23. const [ locator, position, size ] = blockRefs[i];
  24. const prom_1 = makeArvadosRequest(
  25. proxy.service_host + ':' + proxy.service_port,
  26. arvToken,
  27. '/' + locator,
  28. { 'useSsl': proxy.service_ssl_flag,
  29. 'responseType': 'arraybuffer' }
  30. );
  31. prom_2 = prom_2.then(() => prom_1);
  32. prom_2 = prom_2.then(xhr => (blocks.push(xhr.response.slice(position,
  33. position + size))));
  34. }
  35. prom_2 = prom_2.then(() => blocks);
  36. return prom_2;
  37. });
  38. /* prom = prom.then(() => {
  39. const blob = new Blob(blocks);
  40. const url = window.URL.createObjectURL(blob);
  41. const a = document.createElement('a');
  42. a.href = url;
  43. a.download = name;
  44. a.click();
  45. }); */
  46. return prom;
  47. }
  48. export default wbDownloadFile;