terriajs/lib/Core/pollToPromise.ts

Geospatial data visualization platform.

import Frozen from "terriajs-cesium/Source/Core/Frozen";
import getTimestamp from "terriajs-cesium/Source/Core/getTimestamp";

interface Options {
  pollInterval?: number;
  timeout?: number;
}

const pollToPromise = function (f: () => boolean, options: Options) {
  options = options ?? Frozen.EMPTY_OBJECT;

  const pollInterval = options.pollInterval ?? 1;
  const timeout = options.timeout ?? 5000;

  return new Promise<void>((resolve, reject) => {
    const startTimestamp = getTimestamp();
    const endTimestamp = startTimestamp + timeout;

    function poller() {
      if (f()) {
        resolve();
      } else {
        if (getTimestamp() > endTimestamp) {
          reject();
        } else {
          setTimeout(poller, pollInterval);
        }
      }
    }

    poller();
  });
};

export default pollToPromise;