Is there a way to implement retry functionality with a delay in RxJs without resorting to the outdated retryWhen method?

Question

Is there a way to implement retry functionality with a delay in RxJs without resorting to the outdated retryWhen method?

I'd like to implement a retry mechanism for an observable chain with a delay of 2 seconds.

While researching, I found some solutions using retryWhen. However, it appears that retryWhen is deprecated and I prefer not to use it.

The retry with delay should only be triggered if the initial attempt fails
If all retries fail, I wish to handle it by providing default data

The code below works fine without the delay, but how can I incorporate a delay into this chain?

of('trigger')
  .pipe(
    switchMap(() => fetchData()),
    retry(5),
    catchError(() => of(returnThisIfRetriesAreFailed))
  )
  .subscribe(console.log);

View StackBlitz demo

I attempted to add delay(2000), but it doesn't seem to be effective.

javascript angular typescript rxjs

Answer 1

Answer №1

It's unclear what you're asking about.

Delaying and retrying only happens if the initial attempt fails.

After reviewing the source code, I couldn't find any restrictions on using the delay option solely for the first failed try.

Therefore, you can utilize either a fixed number or an Observable as a delay. Consider this example:

of('trigger')
  .pipe(
    switchMap(() => fetchData()),
    retry({count: 5, delay: 2000}),
    catchError(() => of(returnThisIfRetriesAreFailed))
  )
  .subscribe(console.log);

If you specifically want to delay only during the first retry, you can implement something like this:

of('trigger')
  .pipe(
    switchMap(() => fetchData()),
    retry({count: 5, delay: (_, retryCount) => retryCount === 1 ? timer(2000) : of({})}),
    catchError(() => of(returnThisIfRetriesAreFailed))
  )
  .subscribe(console.log);

Answer 2

It's unclear what you're asking about.

Delaying and retrying only happens if the initial attempt fails.

After reviewing the source code, I couldn't find any restrictions on using the delay option solely for the first failed try.

Therefore, you can utilize either a fixed number or an Observable as a delay. Consider this example:

of('trigger')
  .pipe(
    switchMap(() => fetchData()),
    retry({count: 5, delay: 2000}),
    catchError(() => of(returnThisIfRetriesAreFailed))
  )
  .subscribe(console.log);

If you specifically want to delay only during the first retry, you can implement something like this:

of('trigger')
  .pipe(
    switchMap(() => fetchData()),
    retry({count: 5, delay: (_, retryCount) => retryCount === 1 ? timer(2000) : of({})}),
    catchError(() => of(returnThisIfRetriesAreFailed))
  )
  .subscribe(console.log);

Answer 3

Answer №2

Another approach is to incorporate a method within the delay object key and perform additional validations. Here is a snippet from my code for reference.

// Custom method to determine whether to retry a request or not

shouldRetry(error: HttpErrorResponse) {
    // Example of checking for a specific error code
    if (error.status === 503) {
      return timer(1000); // Utilizing RxJS timer to create an observable for delaying
    }

    throw error;
}

// Implementing retry operator in your code base
retry({ count: 2, delay: this.shouldRetry })

Answer 4

Another approach is to incorporate a method within the delay object key and perform additional validations. Here is a snippet from my code for reference.

// Custom method to determine whether to retry a request or not

shouldRetry(error: HttpErrorResponse) {
    // Example of checking for a specific error code
    if (error.status === 503) {
      return timer(1000); // Utilizing RxJS timer to create an observable for delaying
    }

    throw error;
}

// Implementing retry operator in your code base
retry({ count: 2, delay: this.shouldRetry })

Answer 5

Answer №3

Utilize:

of('signal').pipe(
    switchMap(() => retrieveData()),
    catchError((error, captured) => captured.pipe(
                    repeat({ times: 1, interval: 2000 }),
                    catchError(() => of(replaceWithThisIfRetryFails))
              ))
)
.subscribe(console.log);

Answer 6

Utilize:

of('signal').pipe(
    switchMap(() => retrieveData()),
    catchError((error, captured) => captured.pipe(
                    repeat({ times: 1, interval: 2000 }),
                    catchError(() => of(replaceWithThisIfRetryFails))
              ))
)
.subscribe(console.log);

Is there a way to implement retry functionality with a delay in RxJs without resorting to the outdated retryWhen method?

Answer №1

Answer №2

Answer №3

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