@dasch-swiss/dsp-js/src/api/operators/retryOnError.js

JavaScript library that handles API requests to Knora

import { of, throwError } from "rxjs";
import { delay, mergeMap, retryWhen, tap } from "rxjs/operators";
/**
 *
 * Retries failed HTTP requests.
 *
 * @param delayMs delay in milliseconds before the request is retried.
 * @param maxRetries maximum number of retries.
 * @param retryOnErrorStatus HTTP error status codes for which the request is retried.
 * @param logError if true, error is written to the console error log.
 *
 * @category Internal
 */
export function retryOnError(delayMs, maxRetries, retryOnErrorStatus, logError) {
    var retries = maxRetries;
    // inspired by https://medium.com/angular-in-depth/retry-failed-http-requests-in-angular-f5959d486294
    return function (src) {
        return src.pipe(
        // when no error is thrown, this simply returns the source Observable
        retryWhen(function (errors) {
            return errors.pipe(
            // log error message if logging is enabled
            tap(function (error) {
                if (logError)
                    console.error("HTTP request failed:", "status:", error.status, "retries:", retries, "error:", error);
            }), mergeMap(function (error) {
                // retry on specified error status
                // check if max retries is reached ("retries" is decremented on each retry)
                if (retryOnErrorStatus.indexOf(error.status) !== -1 && retries-- > 0) {
                    return of(error).pipe(
                    // delay retry
                    delay(delayMs));
                }
                else {
                    // do not retry
                    return throwError(error);
                }
            }));
        }));
    };
}
//# sourceMappingURL=retryOnError.js.map