Function getMeasuredResources

src/ini-load.js:153–182

(ampdoc, hostWin, filterFn)

 * @return {!Promise<!Array<!./service/resource.Resource>>}
 */
export function getMeasuredResources(ampdoc, hostWin, filterFn) {
  // First, wait for the `ready-scan` signal. Waiting for each element
  // individually is too expensive and `ready-scan` will cover most of
  // the initially parsed elements.
  return ampdoc
    .signals()
    .whenSignal(READY_SCAN_SIGNAL)
    .then(() => {
      // Second, wait for any left-over elements to complete measuring.
      const measurePromiseArray = [];
      const resources = Services.resourcesForDoc(ampdoc);
      resources.get().forEach((r) => {
        if (!r.hasBeenMeasured() && r.hostWin == hostWin && !r.hasOwner()) {
          measurePromiseArray.push(r.ensureMeasured());
        }
      });
      return Promise.all(measurePromiseArray);
    })
    .then(() => {
      const resources = Services.resourcesForDoc(ampdoc);
      return resources.get().filter((r) => {
        return (
          r.hostWin == hostWin &&
          !r.hasOwner() &&
          r.hasBeenMeasured() &&
          filterFn(r)
        );
      });
    });
}