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import { Observable } from '../Observable';
import { innerFrom } from '../observable/innerFrom';
import { Subject } from '../Subject';
import { Subscription } from '../Subscription';
import { MonoTypeOperatorFunction, ObservableInput } from '../types';
import { operate } from '../util/lift';
import { createOperatorSubscriber } from './OperatorSubscriber';
/**
* Returns an Observable that mirrors the source Observable with the exception of an `error`. If the source Observable
* calls `error`, this method will emit the Throwable that caused the error to the `ObservableInput` returned from `notifier`.
* If that Observable calls `complete` or `error` then this method will call `complete` or `error` on the child
* subscription. Otherwise this method will resubscribe to the source Observable.
*
* 
*
* Retry an observable sequence on error based on custom criteria.
*
* ## Example
*
* ```ts
* import { interval, map, retryWhen, tap, delayWhen, timer } from 'rxjs';
*
* const source = interval(1000);
* const result = source.pipe(
* map(value => {
* if (value > 5) {
* // error will be picked up by retryWhen
* throw value;
* }
* return value;
* }),
* retryWhen(errors =>
* errors.pipe(
* // log error message
* tap(value => console.log(`Value ${ value } was too high!`)),
* // restart in 5 seconds
* delayWhen(value => timer(value * 1000))
* )
* )
* );
*
* result.subscribe(value => console.log(value));
*
* // results:
* // 0
* // 1
* // 2
* // 3
* // 4
* // 5
* // 'Value 6 was too high!'
* // - Wait 5 seconds then repeat
* ```
*
* @see {@link retry}
*
* @param notifier Function that receives an Observable of notifications with which a
* user can `complete` or `error`, aborting the retry.
* @return A function that returns an `ObservableInput` that mirrors the source
* Observable with the exception of an `error`.
* @deprecated Will be removed in v9 or v10, use {@link retry}'s `delay` option instead.
* Will be removed in v9 or v10. Use {@link retry}'s {@link RetryConfig#delay delay} option instead.
* Instead of `retryWhen(() => notify$)`, use: `retry({ delay: () => notify$ })`.
*/
export function retryWhen<T>(notifier: (errors: Observable<any>) => ObservableInput<any>): MonoTypeOperatorFunction<T> {
return operate((source, subscriber) => {
let innerSub: Subscription | null;
let syncResub = false;
let errors$: Subject<any>;
const subscribeForRetryWhen = () => {
innerSub = source.subscribe(
createOperatorSubscriber(subscriber, undefined, undefined, (err) => {
if (!errors$) {
errors$ = new Subject();
innerFrom(notifier(errors$)).subscribe(
createOperatorSubscriber(subscriber, () =>
// If we have an innerSub, this was an asynchronous call, kick off the retry.
// Otherwise, if we don't have an innerSub yet, that's because the inner subscription
// call hasn't even returned yet. We've arrived here synchronously.
// So we flag that we want to resub, such that we can ensure finalization
// happens before we resubscribe.
innerSub ? subscribeForRetryWhen() : (syncResub = true)
)
);
}
if (errors$) {
// We have set up the notifier without error.
errors$.next(err);
}
})
);
if (syncResub) {
// Ensure that the inner subscription is torn down before
// moving on to the next subscription in the synchronous case.
// If we don't do this here, all inner subscriptions will not be
// torn down until the entire observable is done.
innerSub.unsubscribe();
innerSub = null;
// We may need to do this multiple times, so reset the flag.
syncResub = false;
// Resubscribe
subscribeForRetryWhen();
}
};
// Start the subscription
subscribeForRetryWhen();
});
}