vid-webpack-master/src/app/shared/utils/httpInterceptor/httpInterceptor.service.ts

   1 import { Injectable } from '@angular/core';
   2 import {
   3   HttpInterceptor,
   4   HttpRequest,
   5   HttpHandler,
   6   HttpEvent, HttpErrorResponse
   7 } from '@angular/common/http';
   8
   9 import { Observable } from 'rxjs/Observable';
  10 import { ErrorMessage, ErrorService } from '../../components/error/error.component.service';
  11 import { SpinnerComponent } from '../../components/spinner/spinner.component';
  12
  13 @Injectable()
  14 export class HttpInterceptorService implements HttpInterceptor {
  15   intercept(request: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
  16     SpinnerComponent.showSpinner.next(true);
  17     return next.handle(request)
  18       .catch((err: HttpErrorResponse) => {
  19         if (err.status === 500) {
  20           const errorMessage: ErrorMessage = new ErrorMessage('Server not available',
  21             'It appears that one of the backend servers is not responding.\n Please try later.',
  22             500);
  23           ErrorService.showErrorWithMessage(errorMessage);
  24           return Observable.of(null);
  25         }
  26         return Observable.throw(err);
  27       }).finally(() => {
  28         SpinnerComponent.showSpinner.next(false);
  29       });
  30   }
  31 }
  32