{
  "version": 3,
  "sources": ["libs/rx-utils/src/lib/vax/index.ts"],
  "sourcesContent": ["import { HttpErrorResponse } from '@angular/common/http';\nimport {\n  Observable,\n  of as observableOf,\n  race,\n  range,\n  ReplaySubject,\n  throwError as observableThrowError,\n  timer,\n} from 'rxjs';\nimport { delayWhen, first, merge, retryWhen, skip, switchMap, tap, zip } from 'rxjs/operators';\n\nexport interface RetryConfig {\n  // Maximimum amount of time to retry before giving up.\n  timeoutMilliseconds?: number;\n  // Maximimum number of times to retry before giving up.\n  maxAttempts?: number;\n  // Initial delay between retries. The delay doubles on each subsequent retry.\n  retryDelay?: number;\n  // A custom predicate to determine whether to retry on an http error.\n  customRetryChecker?: (errResp: HttpErrorResponse) => boolean;\n}\n\nconst DEFAULT_TIMEOUT_MILLIS = 5000;\nconst DEFAULT_MAX_ATTEMPTS = 10;\nconst DEFAULT_RETRY_DELAY_MILLIS = 200;\nconst DEFAULT_RETRY_CHECKER: ((errResp: HttpErrorResponse) => boolean | null) | null = null;\n\n/**\n * This class wraps an http call in retry logic according to a configuration.\n *\n * Only to be used for idempotent calls.\n */\nexport class Retryer<T> {\n  public result$: Observable<T>;\n  private retriedErrors$$ = new ReplaySubject<HttpErrorResponse>(1);\n\n  private timeoutMilliseconds: number;\n  private maxAttempts: number | null;\n  private retryDelay: number;\n  private customRetryChecker: ((errResp: HttpErrorResponse) => boolean | null) | null;\n\n  /**\n   *\n   * @param call The http call or observable to be retried through subscribing\n   * @param config Configure the retry logic\n   */\n  constructor(call: Observable<T>, config?: RetryConfig) {\n    const {\n      timeoutMilliseconds = DEFAULT_TIMEOUT_MILLIS,\n      maxAttempts = DEFAULT_MAX_ATTEMPTS,\n      retryDelay = DEFAULT_RETRY_DELAY_MILLIS,\n      customRetryChecker = DEFAULT_RETRY_CHECKER,\n    } = config || {};\n    this.timeoutMilliseconds = timeoutMilliseconds;\n    this.maxAttempts = maxAttempts;\n    this.retryDelay = retryDelay;\n    this.customRetryChecker = customRetryChecker;\n\n    this.result$ = call.pipe(\n      retryWhen((errors$: Observable<HttpErrorResponse>) => this.getRetries(errors$)),\n      first(),\n    );\n  }\n\n  private getRetries(errors$: Observable<HttpErrorResponse>): Observable<any> {\n    return errors$.pipe(\n      tap((err) => this.retriedErrors$$.next(err)),\n      switchMap((errResp) => (this.shouldRetry(errResp) ? observableOf(errResp) : observableThrowError(errResp))),\n      zip(range(0, this.maxAttempts - 1), (err, tryNumber) => tryNumber),\n      delayWhen((tryNumber) => this.getDelayTimer(tryNumber)),\n      merge(this.getCutoffNotifier(errors$)),\n    );\n  }\n\n  private getCutoffNotifier(errors$: Observable<HttpErrorResponse>): Observable<HttpErrorResponse> {\n    const maxTimeout$ = timer(this.timeoutMilliseconds);\n    const throwLastError$ = this.retriedErrors$$.pipe(switchMap((err) => observableThrowError(err)));\n    const maxAttempts$ = errors$.pipe(skip(this.maxAttempts - 1), first());\n\n    return race<any>(maxTimeout$, maxAttempts$).pipe(switchMap(() => throwLastError$));\n  }\n\n  private shouldRetry(err: HttpErrorResponse): boolean {\n    if (this.customRetryChecker !== null && this.customRetryChecker !== undefined) {\n      return this.customRetryChecker(err);\n    }\n    if (err.error instanceof Error) {\n      // non HTTP Error means a client error or network error occurred, we should retry\n      return true;\n    }\n    return err.status >= 500;\n  }\n\n  private getDelayTimer(tryNumber: number): Observable<any> {\n    const exponentialBackoffDelay = Math.pow(2, tryNumber) * this.retryDelay;\n    return timer(exponentialBackoffDelay).pipe(first());\n  }\n}\n\n/**\n * Usage: httpClient.get('example.com').let(retryWith(retryConfig))\n * OR:    httpClient.get('example.com').pipe( retryWith(retryConfig) );\n * @param config Retry configuration\n */\nexport const retryer =\n  <T>(config?: RetryConfig) =>\n  (call: Observable<T>): Observable<T> => {\n    return new Retryer(call, config).result$;\n  };\n"],
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  "names": ["DEFAULT_TIMEOUT_MILLIS", "DEFAULT_MAX_ATTEMPTS", "DEFAULT_RETRY_DELAY_MILLIS", "DEFAULT_RETRY_CHECKER", "Retryer", "constructor", "call", "config", "retriedErrors$$", "ReplaySubject", "timeoutMilliseconds", "maxAttempts", "retryDelay", "customRetryChecker", "result$", "pipe", "retryWhen", "errors$", "getRetries", "first", "tap", "err", "next", "switchMap", "errResp", "shouldRetry", "observableOf", "observableThrowError", "zip", "range", "tryNumber", "delayWhen", "getDelayTimer", "merge", "getCutoffNotifier", "maxTimeout$", "timer", "throwLastError$", "maxAttempts$", "skip", "race", "undefined", "error", "Error", "status", "exponentialBackoffDelay", "Math", "pow", "retryer"]
}