41f50eb9f984c12c2544.worker.js

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/***/ "./node_modules/babel-loader/lib/index.js?!./node_modules/scratch-storage/src/FetchWorkerTool.worker.js":
/*!************************************************************************************************************!*\
  !*** ./node_modules/babel-loader/lib??ref--4!./node_modules/scratch-storage/src/FetchWorkerTool.worker.js ***!
  \************************************************************************************************************/
/*! no static exports found */
/***/ (function(module, exports, __webpack_require__) {

/* eslint-env worker */

const saferFetchAsArrayBuffer = __webpack_require__(/*! ./safer-fetch */ "./node_modules/scratch-storage/src/safer-fetch.js");
const complete = [];
let timeoutId = null;
const checkCompleted = () => {
  if (timeoutId) return;
  timeoutId = setTimeout(() => {
    timeoutId = null;
    if (complete.length) {
      // Send our chunk of completed requests and instruct postMessage to
      // transfer the buffers instead of copying them.
      postMessage(complete.slice(),
      // Instruct postMessage that these buffers in the sent message
      // should use their Transferable trait. After the postMessage
      // call the "buffers" will still be in complete if you looked,
      // but they will all be length 0 as the data they reference has
      // been sent to the window. This lets us send a lot of data
      // without the normal postMessage behaviour of making a copy of
      // all of the data for the window.
      complete.map(response => response.buffer).filter(Boolean));
      complete.length = 0;
    }
  });
};

/**
 * Receive a job from the parent and fetch the requested data.
 * @param {object} options.job A job id, url, and options descriptor to perform.
 */
const onMessage = _ref => {
  let {
    data: job
  } = _ref;
  saferFetchAsArrayBuffer(job.url, job.options).then(buffer => complete.push({
    id: job.id,
    buffer
  })).catch(error => complete.push({
    id: job.id,
    error: error && error.message || "Failed request: ".concat(job.url)
  })).then(checkCompleted);
};
if (self.fetch) {
  postMessage({
    support: {
      fetch: true
    }
  });
  self.addEventListener('message', onMessage);
} else {
  postMessage({
    support: {
      fetch: false
    }
  });
  self.addEventListener('message', _ref2 => {
    let {
      data: job
    } = _ref2;
    postMessage([{
      id: job.id,
      error: 'fetch is unavailable'
    }]);
  });
}

/***/ }),

/***/ "./node_modules/scratch-storage/src/safer-fetch.js":
/*!*********************************************************!*\
  !*** ./node_modules/scratch-storage/src/safer-fetch.js ***!
  \*********************************************************/
/*! no static exports found */
/***/ (function(module, exports) {

/* eslint-env browser */
/* eslint-disable no-use-before-define */

// This throttles and retries fetch() to mitigate the effect of random network errors and
// random browser errors (especially in Chrome)

let currentFetches = 0;
const queue = [];
const startNextFetch = _ref => {
  let [resolve, url, options] = _ref;
  let firstError;
  let failedAttempts = 0;
  const attemptToFetch = () => fetch(url, options).then(result => {
    // In a macOS WKWebView, requests from file: URLs to other file: URLs always have status: 0 and ok: false
    // even though the requests were successful. If the requested file doesn't exist, fetch() rejects instead.
    // We aren't aware of any other cases where fetch() can resolve with status 0, so this should be safe.
    if (result.ok || result.status === 0) return result.arrayBuffer();
    if (result.status === 404) return null;
    return Promise.reject(result.status);
  }).then(buffer => {
    currentFetches--;
    checkStartNextFetch();
    return buffer;
  }).catch(error => {
    if (error === 403) {
      // Retrying this request will not help, so return an error now.
      throw error;
    }
    console.warn("Attempt to fetch ".concat(url, " failed"), error);
    if (!firstError) {
      firstError = error;
    }
    if (failedAttempts < 2) {
      failedAttempts++;
      return new Promise(cb => setTimeout(cb, (failedAttempts + Math.random() - 1) * 5000)).then(attemptToFetch);
    }
    currentFetches--;
    checkStartNextFetch();
    throw firstError;
  });
  return resolve(attemptToFetch());
};
const checkStartNextFetch = () => {
  if (currentFetches < 100 && queue.length > 0) {
    currentFetches++;
    startNextFetch(queue.shift());
  }
};
const saferFetchAsArrayBuffer = (url, options) => new Promise(resolve => {
  queue.push([resolve, url, options]);
  checkStartNextFetch();
});
module.exports = saferFetchAsArrayBuffer;

/***/ })

/******/ });
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