Angular2 rxjs - switchmap catch error

Question

I'd like to be able to handle any errors that error when calling this.authService.refreshToken(). Can errors be handled within the switchmap block, or how do I go about handling an error in this case?

post3(endpoint: string, body: string) : Observable<any> {
    if (this.authService.tokenRequiresRefresh()) {
      this.authService.tokenIsBeingRefreshed.next(true);
      return this.authService.refreshToken().switchMap(
        data => {
          this.authService.refreshTokenSuccessHandler(data);
          if (this.authService.loggedIn()) {
            this.authService.tokenIsBeingRefreshed.next(false);
            return this.postInternal(endpoint, body);
          } else {
            this.authService.tokenIsBeingRefreshed.next(false);
            this.router.navigate(['/sessiontimeout']);
            Observable.throw(data);
          }
        }
      );
    }
    else {
      return this.postInternal(endpoint, body);
    }
  }

BTW, you need a return: return Observable.throw(data);

cartant
– cartant

2017-01-20 02:04:15 +00:00
Commented Jan 20, 2017 at 2:04 — cartant
– cartant, Commented Jan 20, 2017 at 2:04

shusson · Accepted Answer · 2018-11-29 21:55:25Z

38

use the catchError method

this.authService.refreshToken()
  .pipe(
     switchMap(() => {...}),
     catchError((e) => {
       // handle e and return a safe value or re-throw
       if (isCritical(e)) {
         return throwError(e);
       }
       return of([]);
    })
  );

edited Nov 29, 2018 at 21:55

answered Jan 20, 2017 at 1:02

shusson

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2 Comments

Alex Peters Over a year ago

This method was renamed to catchError in v6.

shusson Over a year ago

thanks @AlexPeters, I updated the example to use the latest api.

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