Managing errors with the RxJS retry operator

Question

Managing errors with the RxJS retry operator

I'm facing an issue with my RxJS code where I need to continuously retry a data request upon failure while also handling the error. Currently, I am using the retry operator for this purpose. However, when attempting to subscribe to the retry operator as shown in this article, I encounter the error TS2339: Property subscribe does not exist on type MonoTypeOperatorFunction.

Is there a way to effectively handle errors with the retry operator without resorting to the deprecated retryWhen method?

const interval = 2000;
this.xyzService.getData()
.pipe(
    takeUntil(this.destroy$),
    retry({
        delay: interval,
        resetOnSuccess: true
    }),
    //catchError(() => {
    //  ...handling error...
    //  return EMPTY;
    //}),
    map((response) => {
      this.data = response.body;
      this.state = 'LOADED';
    }),
    delay(interval),
    repeat(),
).subscribe();

angular typescript rxjs

Answer 1

Answer №1

To address any errors that may occur before reaching the retry function, consider inserting a tap operator to manage additional logic on the local side.

this.xyzService.getData()
  .pipe(
    ...,
    tap({ 
      error: (err) => //perform actions based on the error locally
    }),
    retry({
      delay: interval,
      resetOnSuccess: true
    }),
    ...
  ).subscribe()

Answer 2

To address any errors that may occur before reaching the retry function, consider inserting a tap operator to manage additional logic on the local side.

this.xyzService.getData()
  .pipe(
    ...,
    tap({ 
      error: (err) => //perform actions based on the error locally
    }),
    retry({
      delay: interval,
      resetOnSuccess: true
    }),
    ...
  ).subscribe()

Answer 3

Answer №2

Take a look at this demonstration I created. Within the catchError function, you can manage the error (in my case, simply logging it to the console, but you could also assign it to a local variable or perform other actions). It is important to throw the error again using throw error so that the retry functionality can continue. If needed, you can even throw a new error to update the error message.

I have provided an easy-to-understand example that can be copied and pasted for testing purposes.

    of(undefined)
      .pipe(
        switchMap(() => {
          console.log("Attempting to retrieve data...");
          throw new Error();
        }),
        catchError(error => {
          console.log("Encountered an error while retrieving data...");
          throw error;
        }),
        retry({ delay: 2000 })
      )
      .subscribe(() => console.log("Hello World!"));

The solution offered by @akotech is effective and maintains clarity in the context of error handling.

Answer 4

Take a look at this demonstration I created. Within the catchError function, you can manage the error (in my case, simply logging it to the console, but you could also assign it to a local variable or perform other actions). It is important to throw the error again using throw error so that the retry functionality can continue. If needed, you can even throw a new error to update the error message.

I have provided an easy-to-understand example that can be copied and pasted for testing purposes.

    of(undefined)
      .pipe(
        switchMap(() => {
          console.log("Attempting to retrieve data...");
          throw new Error();
        }),
        catchError(error => {
          console.log("Encountered an error while retrieving data...");
          throw error;
        }),
        retry({ delay: 2000 })
      )
      .subscribe(() => console.log("Hello World!"));

The solution offered by @akotech is effective and maintains clarity in the context of error handling.

Managing errors with the RxJS retry operator

Answer №1

Answer №2

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