Creating a method in Angular that combines async/await functionality with Observables

After transitioning from using async/await to Observables in Angular, I am trying to refactor the following code snippet to make it work with Observables:

async refreshToken() {
    const headers = this.authStorage.getRequestHeader();
    const body = {
      refreshToken: this.authStorage.getStoredValue('refreshToken'),
    };
    const newAccessToken = await this.http
      .post<any>(ApiURLStore.REFRESH_TOKEN_URL, body, { headers: headers })
      .toPromise();

    this.authStorage.setValueToStore('accessToken', newAccessToken);
  }

Essentially, I want to convert this function into one that returns an Observable after making a POST request to the backend and updating authStorage:

refreshToken(): Observable<any> {
    const headers = this.authStorage.getRequestHeader();
    const body = {
      refreshToken: this.authStorage.getStoredValue('refreshToken'),
    };
    return this.http
      .post<any>(ApiURLStore.REFRESH_TOKEN_URL, body, { headers: headers });

    this.authStorage.setValueToStore('accessToken', newAccessToken);
  }

While this code technically works, I'm facing issues accessing authStorage within an Observable. I've tried using pipe and subscribe without success. Any suggestions on how to approach this problem?

Answer №1

To handle side effects, utilize the tap operator:

Implement your desired logic within the tap operator like this:
return this.http
    .post<any>(ApiURLStore.REFRESH_TOKEN_URL, body, { headers: headers })
    .pipe(
        tap(newAccessToken => this.authStorage.setValueToStore('accessToken', newAccessToken))
    );

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