我正在使用 Angular 服务从我的API。我实现了重试功能，以防获取数据失败。现在，当所有重试都耗尽时，我需要处理错误，但我无法捕获它。
以下是我的代码，
public getInfoAPI(category:string, id:string = "", page:string = "1", limit:string = "10"){
var callURL : string = '';
if(!!id.trim() && !isNaN(+id)) callURL = this.apiUrl+'/info/'+category+'/'+id;
else callURL = this.apiUrl+'/info/'+category;
return this.http.get(callURL,{
params: new HttpParams()
.set('page', page)
.set('limit', limit)
}).pipe(
retryWhen(errors => errors.pipe(delay(1000), take(10), catchError(this.handleError)))//This will retry 10 times at 1000ms interval if data is not found
);
}
// Handle API errors
handleError(error: HttpErrorResponse) {
console.log("Who's there?");
if (error.error instanceof ErrorEvent) {
// A client-side or network error occurred. Handle it accordingly.
console.error('An error occurred:', error.error.message);
} else {
// The backend returned an unsuccessful response code.
// The response body may contain clues as to what went wrong,
console.error(
`Backend returned code ${error.status}, ` +
`body was: ${error.error}`);
}
// return an observable with a user-facing error message
return throwError(
'Something bad happened; please try again later.');
};
我能够以 1 秒延迟成功重试 10 次，但是当 10 次重试完成后，我希望无法捕获错误。
Note:
我是 Angular 的新手，因此如果您能在此通话中提出改进建议，我们欢迎您这样做。
return this.http.get(callURL,{
params: new HttpParams()
.set('page', page)
.set('limit', limit)
}).pipe(
retryWhen(genericRetryStrategy({maxRetryAttempts: 10, scalingDuration: 1})),
catchError(this.handleError)
);
Where genericRetryStrategy是从这个当资源重试
export const genericRetryStrategy = ({
maxRetryAttempts = 3,
scalingDuration = 1000,
excludedStatusCodes = []
}: {
maxRetryAttempts?: number,
scalingDuration?: number,
excludedStatusCodes?: number[]
} = {}) => (attempts: Observable<any>) => {
return attempts.pipe(
mergeMap((error, i) => {
const retryAttempt = i + 1;
// if maximum number of retries have been met
// or response is a status code we don't wish to retry, throw error
if (
retryAttempt > maxRetryAttempts ||
excludedStatusCodes.find(e => e === error.status)
) {
return throwError(error);
}
console.log(
`Attempt ${retryAttempt}: retrying in ${retryAttempt *
scalingDuration}ms`
);
// retry after 1s, 2s, etc...
return timer(retryAttempt * scalingDuration);
}),
finalize(() => console.log('We are done!'))
);
};