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src/app/services/error.service.ts

@@ -1,23 +1,52 @@
-import {Injectable, Injector} from '@angular/core';
-import {Response} from '../class/HttpReqAndResp';
+import {Injectable} from '@angular/core';
+import {RequestObj, Response} from '../class/HttpReqAndResp';
 import {HttpService} from '../api/http/http.service';
+import {environment} from '../../environments/environment';
+import {Router} from '@angular/router';
+import {ComponentStateService} from './component-state.service';
 
 @Injectable({
     providedIn: 'root'
 })
 export class ErrorService {
 
-    constructor(private httpService: HttpService) {
+    constructor(private httpService: HttpService, private router: Router,
+                private componentStateService: ComponentStateService) {
     }
 
+    private static HTTP_ERROR_COUNT: number = 0;
+    private readonly MAINTAIN_PAGE_PREFIX = '/maintain'
+
     public httpError(err: any) {
-        console.log('error=>', err)
+        if (!environment.production) {
+            console.log('error=>', err)
+        }
+        ErrorService.HTTP_ERROR_COUNT++;
         // this.httpService.getSubscriptionQueue().map(a => a.unsubscribe())
     }
 
     public httpException(response: Response<any>) {
-        console.log('exception=>', response)
+        if (!environment.production)
+            console.log('exception=>', response)
     }
 
-
+    public checkConnection() {
+        // The HTTP_ERROR_COUNT is start with 1 in this function
+        if (ErrorService.HTTP_ERROR_COUNT === 1) {
+            const req: RequestObj = {
+                path: '/headerInfo',
+                method: 'GET',
+                url: environment.host + '/headerInfo'
+            }
+            this.httpService.get(req).subscribe({
+                next: data => null,
+                error: err => {
+                    if (this.componentStateService.currentPath !== this.MAINTAIN_PAGE_PREFIX) {
+                        this.router.navigateByUrl(this.MAINTAIN_PAGE_PREFIX)
+                    }
+                    ErrorService.HTTP_ERROR_COUNT = 0;
+                }
+            })
+        }
+    }
 }