Implement healthcheck service

projects/common/src/fm/services/healthcheck.service.ts

@@ -0,0 +1,30 @@
+import { Injectable } from '@angular/core';
+import { Observable,BehaviorSubject,of } from 'rxjs';
+import { map, catchError } from 'rxjs/operators';
+import { HttpClient, HttpXhrBackend } from "@angular/common/http";
+import { AppConfig } from "../shared/app.config";
+
+@Injectable({
+    providedIn: 'root',
+  })
+  export class HealthCheckService {
+    private httpClient: HttpClient;
+
+    constructor(xhrBackend: HttpXhrBackend, public appConfig: AppConfig) {
+        this.httpClient = new HttpClient(xhrBackend);
+    }
+  
+    ApiEndpoint() {
+      return this.appConfig.getConfig("apiEndPoint");
+    }
+
+    check(interval:number): Observable<boolean> {
+      let retval = new BehaviorSubject<boolean>(false);
+      setInterval(() => {
+        this.httpClient.get(`${this.ApiEndpoint()}/api/v1/healthcheck`).pipe(map(() => true),catchError((error) => of(false))).toPromise().then((status) => {
+           retval.next(status);
+        });
+      },interval);
+      return retval;
+    }
+}