Invoke an RxJs observable to handle errors and retry the process

Question

Invoke an RxJs observable to handle errors and retry the process

I have an observable called submit$ that submits a form. If this observable encounters an error with status code 403, it means the user is not authorized and needs to log in first.

Is there a way to automatically trigger another observable when a specific error code occurs? This new observable would handle the authorization process. Once the authorization is successful, I want the submit$ observable to be repeated without requiring the user to manually invoke it again.

Here are the steps I envision:

The user attempts to submit the form and the submit$ observable is activated
An error with status code 403 is encountered
The observable then calls a separate authorise$ observable which handles the authorization workflow
Upon successful authorization, the submit$ observable is triggered again
The process concludes with either success or error
If an error arises during the authorization process, the submit$ operation is terminated

javascript angular typescript rxjs observable

Answer 1

Answer №1

My approach in this code snippet involves separating the process into two observables, submit$ and authenticationSubmit$, which are then merged back together. It should be noted that I have not yet tested this code and there appears to be duplication in the http.post(...) calls, deviating slightly from your described method.

import { merge } from 'rxjs';
import { filter, switchMap } from 'rxjs/operators';

...

const submit$ = http.post(...);

const authenticationAndSubmit$ = submit$.pipe(
  filter(httpResponse => httpResponse.status === 403),
  switchMap(() => authService.login()),
  filter(authResult => authResult === 'success'),
  switchMap(() => http.post(...))
);

merge(submit$, authenticationAndSubmit$)
  .pipe(
    filter(httpResponse => httpResponse.status === 200),
  )
  .subscribe(httpResponse => {
    // Perform necessary actions here
  });

Answer 2

My approach in this code snippet involves separating the process into two observables, submit$ and authenticationSubmit$, which are then merged back together. It should be noted that I have not yet tested this code and there appears to be duplication in the http.post(...) calls, deviating slightly from your described method.

import { merge } from 'rxjs';
import { filter, switchMap } from 'rxjs/operators';

...

const submit$ = http.post(...);

const authenticationAndSubmit$ = submit$.pipe(
  filter(httpResponse => httpResponse.status === 403),
  switchMap(() => authService.login()),
  filter(authResult => authResult === 'success'),
  switchMap(() => http.post(...))
);

merge(submit$, authenticationAndSubmit$)
  .pipe(
    filter(httpResponse => httpResponse.status === 200),
  )
  .subscribe(httpResponse => {
    // Perform necessary actions here
  });

Invoke an RxJs observable to handle errors and retry the process

Answer №1

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