How to handle multiple error code scenario in http request

Question

Error codes below :-

400 - perform single retry on response arrival without delay

502, 503 and 504 perform eight number of retries with 1000 Sec delay

My code is below :-

private _getData('loginKey', body, headers) {
return this._http.post('url', body, { headers: headers })
  .map((response: Response) => response.json())
  .retryWhen(errors => {
    return errors
      .mergeMap((error) => this.handleError(error))
      .delay(2000)
      .take(8);
  });
}

public handleError(error: Response | any): Observable<any> {
  if (error.status === 400) { // retry 1 time and with no delay
    return Observable.of(error);
  } else { // retry confgured times and configured delay
    return Observable.of(error);
  }
}

My problem is how to change delay and take value according to the above Error codes:

if error.status is 400 then delay value 0 and take value 1

if error.status is 502, 503 and 504 then delay value 2000 and take value 8

If my response answers your question would you accept it?

Jeff Musser
– Jeff Musser

2017-07-24 20:35:28 +00:00
Commented Jul 24, 2017 at 20:35 — Jeff Musser
– Jeff Musser, Commented Jul 24, 2017 at 20:35
yes definitely if it will helpful.

rajesh verma
– rajesh verma

2017-07-25 18:05:15 +00:00
Commented Jul 25, 2017 at 18:05 — rajesh verma
– rajesh verma, Commented Jul 25, 2017 at 18:05
I have updated my answer

Jeff Musser
– Jeff Musser

2017-07-30 20:31:13 +00:00
Commented Jul 30, 2017 at 20:31 — Jeff Musser
– Jeff Musser, Commented Jul 30, 2017 at 20:31

Jeff Musser · Accepted Answer · 2017-07-28 19:49:36Z

1

The easiest way to do this is to define a function in a service that will return the value you want.

example:

let errorStatus;
private _getData('loginKey', body, headers) {
return this._http.post('url', body, { headers: headers })
  .map((response: Response) => response.json())
  .retryWhen(errors => {
    return errors
      .mergeMap((error) => {
          errorStatus = error.status;
          this.handleError(error))
      })
      .delay(ResponseService.getDelay(errorStatus))
      .take(ResponseService.getRetries(errorStatus));
  });
}

in ResponseService.js...

function getDelay(status) {
    let val = 0;
    switch(status) {
        case 400:
            val = 0;
            break;
        ...
    }
    return val;
}

function getRetries(status) {
    let val = 0;
    switch(status) {
        case 400:
            val = 1;
            break;
        ...
    }
    return val
}

edited Jul 28, 2017 at 19:49

answered Jul 24, 2017 at 16:09

Jeff Musser

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3 Comments

rajesh verma Over a year ago

but error.status is not accessible in delay and take any idea about how to access it.

Jeff Musser Over a year ago

I updated the work. You should be able to capture the value of the error so you can use it outside the scope of the mergeMap

rajesh verma Over a year ago

I have try your solution but still not able to access errorstatus inside delay and take because this is calling before the mergeMap inside code run. So any solution on this code or any alternation solution available. Please see this link: reactivex.io/rxjs/class/es6/Observable.js~Observable.html i don't have the complete knowledge of Observable uses I have used one method from this link mergeMap, delay and take so maybe any alternation solution is available on this link. Please guide me what approach i use for this solution if you know.

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