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import { Injectable } from '@angular/core';
import {
HttpInterceptor,
HttpRequest,
HttpHandler,
HttpEvent, HttpErrorResponse
} from '@angular/common/http';
import { Observable } from 'rxjs/Observable';
import { ErrorMessage, ErrorService } from '../../components/error/error.component.service';
import { SpinnerComponent } from '../../components/spinner/spinner.component';
@Injectable()
export class HttpInterceptorService implements HttpInterceptor {
intercept(request: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
SpinnerComponent.showSpinner.next(true);
return next.handle(request)
.catch((err: HttpErrorResponse) => {
if (err.status === 500) {
const errorMessage: ErrorMessage = new ErrorMessage('Server not available',
'It appears that one of the backend servers is not responding.\n Please try later.',
500);
ErrorService.showErrorWithMessage(errorMessage);
return Observable.of(null);
}
return Observable.throw(err);
}).finally(() => {
SpinnerComponent.showSpinner.next(false);
});
}
}
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