kentico-cloud-delivery/_es2015/services/http/retry-strategy.js

Official Kentico Cloud Delivery SDK

import { throwError, timer } from 'rxjs';
import { mergeMap } from 'rxjs/operators';
var RetryStrategy = /** @class */ (function () {
    function RetryStrategy() {
        var _this = this;
        this.strategy = function (options) { return function (attempts) {
            return attempts.pipe(mergeMap(function (error, i) {
                var retryAttempt = i + 1;
                // if maximum number of retries have been met
                // or response is a status code we don't wish to retry, throw error
                if (retryAttempt > options.maxRetryAttempts ||
                    options.excludedStatusCodes.find(function (e) { return e === error.status; })) {
                    return throwError(error);
                }
                // calculate retry time
                var retryTimeout = _this.getRetryTimeout(retryAttempt);
                // debug log attempt
                _this.debugLogAttempt(retryAttempt, retryTimeout);
                return timer(retryTimeout);
            }));
        }; };
    }
    /**
    * Calculates retry attempt timeout in ms
    * @param attempt Index of the attempt to calculate increasing delay when retrying
    */
    RetryStrategy.prototype.getRetryTimeout = function (attempt) {
        return Math.pow(2, attempt) * 100;
    };
    /**
     * Logs attempt in console.
     * This function is also used for testing in jasmine spy
     * @param attempt Index of attempt
     */
    RetryStrategy.prototype.debugLogAttempt = function (attempt, retryTimeout) {
        console.warn("Attempt " + attempt + ": retrying in " + retryTimeout + "ms");
    };
    return RetryStrategy;
}());
export { RetryStrategy };
export var retryStrategy = new RetryStrategy();
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