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Viewing file:     retryer.js (4.31 KB)      -rw-r--r--

import { focusManager } from './focusManager';
import { onlineManager } from './onlineManager';
import { sleep } from './utils'; // TYPES

function defaultRetryDelay(failureCount) {
  return Math.min(1000 * Math.pow(2, failureCount), 30000);
}

export function isCancelable(value) {
  return typeof (value == null ? void 0 : value.cancel) === 'function';
}
export var CancelledError = function CancelledError(options) {
  this.revert = options == null ? void 0 : options.revert;
  this.silent = options == null ? void 0 : options.silent;
};
export function isCancelledError(value) {
  return value instanceof CancelledError;
} // CLASS

export var Retryer = function Retryer(config) {
  var _this = this;

  var cancelRetry = false;
  var cancelFn;
  var continueFn;
  var promiseResolve;
  var promiseReject;

  this.cancel = function (cancelOptions) {
    return cancelFn == null ? void 0 : cancelFn(cancelOptions);
  };

  this.cancelRetry = function () {
    cancelRetry = true;
  };

  this.continue = function () {
    return continueFn == null ? void 0 : continueFn();
  };

  this.failureCount = 0;
  this.isPaused = false;
  this.isResolved = false;
  this.isTransportCancelable = false;
  this.promise = new Promise(function (outerResolve, outerReject) {
    promiseResolve = outerResolve;
    promiseReject = outerReject;
  });

  var resolve = function resolve(value) {
    if (!_this.isResolved) {
      _this.isResolved = true;
      config.onSuccess == null ? void 0 : config.onSuccess(value);
      continueFn == null ? void 0 : continueFn();
      promiseResolve(value);
    }
  };

  var reject = function reject(value) {
    if (!_this.isResolved) {
      _this.isResolved = true;
      config.onError == null ? void 0 : config.onError(value);
      continueFn == null ? void 0 : continueFn();
      promiseReject(value);
    }
  };

  var pause = function pause() {
    return new Promise(function (continueResolve) {
      continueFn = continueResolve;
      _this.isPaused = true;
      config.onPause == null ? void 0 : config.onPause();
    }).then(function () {
      continueFn = undefined;
      _this.isPaused = false;
      config.onContinue == null ? void 0 : config.onContinue();
    });
  }; // Create loop function


  var run = function run() {
    // Do nothing if already resolved
    if (_this.isResolved) {
      return;
    }

    var promiseOrValue; // Execute query

    try {
      promiseOrValue = config.fn();
    } catch (error) {
      promiseOrValue = Promise.reject(error);
    } // Create callback to cancel this fetch


    cancelFn = function cancelFn(cancelOptions) {
      if (!_this.isResolved) {
        reject(new CancelledError(cancelOptions)); // Cancel transport if supported

        if (isCancelable(promiseOrValue)) {
          try {
            promiseOrValue.cancel();
          } catch (_unused) {}
        }
      }
    }; // Check if the transport layer support cancellation


    _this.isTransportCancelable = isCancelable(promiseOrValue);
    Promise.resolve(promiseOrValue).then(resolve).catch(function (error) {
      var _config$retry, _config$retryDelay;

      // Stop if the fetch is already resolved
      if (_this.isResolved) {
        return;
      } // Do we need to retry the request?


      var retry = (_config$retry = config.retry) != null ? _config$retry : 3;
      var retryDelay = (_config$retryDelay = config.retryDelay) != null ? _config$retryDelay : defaultRetryDelay;
      var delay = typeof retryDelay === 'function' ? retryDelay(_this.failureCount, error) : retryDelay;
      var shouldRetry = retry === true || typeof retry === 'number' && _this.failureCount < retry || typeof retry === 'function' && retry(_this.failureCount, error);

      if (cancelRetry || !shouldRetry) {
        // We are done if the query does not need to be retried
        reject(error);
        return;
      }

      _this.failureCount++; // Notify on fail

      config.onFail == null ? void 0 : config.onFail(_this.failureCount, error); // Delay

      sleep(delay) // Pause if the document is not visible or when the device is offline
      .then(function () {
        if (!focusManager.isFocused() || !onlineManager.isOnline()) {
          return pause();
        }
      }).then(function () {
        if (cancelRetry) {
          reject(error);
        } else {
          run();
        }
      });
    });
  }; // Start loop


  run();
};