使用进样器时出现角度“超出最大调用堆栈大小”

Question

I created Angular 5 project and create one factory which should provide metadata from service before application start. The problem is that I get error:

RangeError: Maximum call stack size exceeded
    at resolveNgModuleDep (core.js:10559)
    at _callFactory (core.js:10649)
    at _createProviderInstance$1 (core.js:10599)
    at resolveNgModuleDep (core.js:10581)
    at _createClass (core.js:10622)
    at _createProviderInstance$1 (core.js:10596)
    at resolveNgModuleDep (core.js:10581)
    at NgModuleRef_.get (core.js:11806)
    at new MetadataService (metadata.service.ts:23)
    at _createClass (core.js:10622)

App module:

@NgModule({
  declarations: [
      AppComponent,
      ...
  ],
  imports: [
      BrowserModule,
      HttpClientModule,
      AppRoutingModule,
      FormsModule,
      FlexLayoutModule,
      I18NextModule.forRoot()
  ],
  providers: [
      { provide: HTTP_INTERCEPTORS, useClass: AuthInterceptor, multi: true },
      MetadataService,
      { provide: APP_INITIALIZER, useFactory: MetadataProviderFactory, deps: [MetadataService], multi: true },
      { provide: APP_INITIALIZER, useFactory: I18NextProviderFactory, deps: [I18NEXT_SERVICE], multi: true }      
  ],
  bootstrap: [AppComponent]
})
export class AppModule { }

Metadata service:

import { Injectable, Injector } from '@angular/core';
import { Observable } from 'rxjs/Observable';
import { HttpClient } from '@angular/common/http';   

@Injectable()
export class MetadataService {   
    private http: HttpClient;

    constructor(private injector: Injector) { 
        this.http = injector.get(HttpClient);  // this row makes a problem
    }

This row makes a problem.

 this.http = injector.get(HttpClient);

I put this line avoid circular reference and I get "Maximum call stack size exceeded". Where I am wrong ?

Answer 1

You can temporarily get over this by delaying your http call that you make on service init, with a simple setTimeOut (don't need any seconds). I've gone through a few open Angular threads and the main issue has to do with HttpInterceptor and circular depedenecy with the HttpClient.