Extract status code polling logic into a class

src/app/dashboard/dashboard.component.html

@@ -5,7 +5,7 @@
       <app-messages></app-messages>
     </div>
     <div class="tfw-web tao-grid-top-left"
-         [ngClass]="{'deploy-blur': deploying || (polling | async)}">
+         [ngClass]="{'deploy-blur': deploying || (iframeReloadPoller.isPolling | async)}">
         <div *ngIf="iframeUrl | async" class="iframe-container">
           <div *ngIf="showUrlBar | async" class="urlbar-container">
             <button class="refresh btn btn-sm rounded-circle" (click)="reloadIframe()">&#8635;</button>

src/app/dashboard/dashboard.component.ts

@@ -1,13 +1,13 @@
 import { Component, OnDestroy, OnInit, ChangeDetectorRef, ElementRef, ViewChild } from '@angular/core';
 import { DeploymentNotificationService } from '../services/deployment-notification.service';
-import { Subscription, BehaviorSubject } from 'rxjs';
+import { Subscription } from 'rxjs';
 import { WebSocketService } from '../services/websocket.service';
 import { WebSocketMessage } from '../message-types/websocket-message';
-import { DashboardConfigService } from '../services/config.service';
+import { DashboardConfigService, ConfigReadyService } from '../services/config.service';
 import { HttpClient } from '@angular/common/http';
-import { delay, retryWhen, tap } from 'rxjs/operators';
 import { FSMUpdateService } from '../services/fsmupdate.service';
 import { MessagesComponent } from '../messages/messages.component';
+import { StatusCodePoller } from './statuscodepoller';
 
 @Component({
   selector: 'app-dashboard',
@@ -16,7 +16,6 @@ import { MessagesComponent } from '../messages/messages.component';
 })
 export class DashboardComponent implements OnInit, OnDestroy {
   deploying = false;
-  polling = new BehaviorSubject<boolean>(false);
   deploymentNotificationSubscription: Subscription;
   @ViewChild('webiframe', {static: false}) webiframe: ElementRef;
   @ViewChild(MessagesComponent, {static: false}) messages: MessagesComponent;
@@ -28,7 +27,7 @@ export class DashboardComponent implements OnInit, OnDestroy {
   iframeUrl = this.configService.iframeUrl;
   actualIframeUrl = this.iframeUrl.value;
   terminalMenuItem = this.configService.terminalMenuItem;
-  iframeReloadSubscription: Subscription;
+  iframeReloadPoller: StatusCodePoller;
 
   command_handlers = {
     'dashboard.reloadFrontend':   this.reloadFrontendHandlder.bind(this),
@@ -39,6 +38,7 @@ export class DashboardComponent implements OnInit, OnDestroy {
               private webSocketService: WebSocketService,
               private changeDetectorRef: ChangeDetectorRef,
               private http: HttpClient,
+              private configReadyService: ConfigReadyService,
               private configService: DashboardConfigService,
               private fsmUpdateService: FSMUpdateService) {}
 
@@ -46,6 +46,7 @@ export class DashboardComponent implements OnInit, OnDestroy {
     this.webSocketService.connect();
     this.configService.init();
     this.subscribeCheckSolution();
+    this.iframeReloadPoller = new StatusCodePoller(this.iframeUrl, this.http);
     this.hideIframeUntilResponseOk();
     this.subscribeResizeOnLayoutChange();
     this.initCommandHandling();
@@ -63,8 +64,10 @@ export class DashboardComponent implements OnInit, OnDestroy {
   }
 
   hideIframeUntilResponseOk() {
-    // TODO: hide iframe and show it after this whole deal...
-    this.reloadIframeWhenResponseOk();
+    this.iframeReloadPoller.ok.subscribe(() => this.reloadIframe());
+    this.configReadyService.configDone.subscribe(() =>
+      this.iframeReloadPoller.start()
+    );
   }
 
   subscribeResizeOnLayoutChange() {
@@ -86,7 +89,7 @@ export class DashboardComponent implements OnInit, OnDestroy {
       (deploying) => {
         this.deploying = deploying;
         if (!deploying && this.configService.reloadIframeOnDeploy.value) {
-          this.reloadIframeWhenResponseOk();
+          this.iframeReloadPoller.start();
         }
       });
   }
@@ -151,36 +154,10 @@ export class DashboardComponent implements OnInit, OnDestroy {
     this.iframeUrl.next(this.urlbar.nativeElement.value);
   }
 
-  reloadIframeWhenResponseOk() {
-    if (this.polling.value) {
-      this.iframeReloadSubscription.unsubscribe();
-    }
-    this.polling.next(true);
-    this.iframeReloadSubscription = this.http.get(this.actualIframeUrl, {observe: 'response'}).pipe(
-      retryWhen(errors =>
-        errors.pipe(
-          tap(
-            response => {
-              if (this.iframeUrl.value === '') {
-                this.iframeReloadSubscription.unsubscribe();
-                this.polling.next(false);
-              }
-              if (response.status === 200) {
-                this.iframeReloadSubscription.unsubscribe();
-                this.polling.next(false);
-                this.reloadIframe();
-          }}),
-          delay(1000)
-    ))).subscribe();
-  }
-
   ngOnDestroy() {
     if (this.deploymentNotificationSubscription) {
       this.deploymentNotificationSubscription.unsubscribe();
     }
-
-    if (this.iframeReloadSubscription) {
-      this.iframeReloadSubscription.unsubscribe();
-    }
+    this.iframeReloadPoller.stop();
   }
 }

src/app/dashboard/statuscodepoller.ts

@@ -0,0 +1,63 @@
+import { HttpClient } from '@angular/common/http';
+import { Subject, Subscription, BehaviorSubject } from 'rxjs';
+import { retryWhen, delay, tap, skip } from 'rxjs/operators';
+
+export class StatusCodePoller {
+  http: HttpClient;
+  url: BehaviorSubject<string>;
+  pollFreq: number;
+  okCode: number;
+  stopOnOk: boolean;
+
+  pollSubscription: Subscription;
+  urlSubscription: Subscription;
+  poll = new Subject<any>();
+  ok = new Subject<any>();
+  isPolling = new BehaviorSubject<boolean>(false);
+
+  constructor(
+      url: BehaviorSubject<string>, http: HttpClient,
+      pollFreq = 1000, okCode = 200,
+      stopOnOk = true
+    ) {
+    this.url = url;
+    this.http = http;
+    this.pollFreq = pollFreq;
+    this.okCode = okCode;
+    this.stopOnOk = stopOnOk;
+  }
+
+  start() {
+    this.stop();
+    if (this.url.value === '') {
+      return;
+    }
+    this.urlSubscription = this.url.pipe(skip(1)).subscribe(() => this.stop());
+    this.isPolling.next(true);
+    this.pollSubscription = this.http.get(this.url.value, {observe: 'response'}).pipe(
+      retryWhen(errors =>
+        errors.pipe(
+          tap(
+            response => {
+              this.poll.next(response);
+              if (response.status === this.okCode) {
+                if (this.stopOnOk) {
+                  this.stop();
+                }
+                this.ok.next(response);
+              }
+          }),
+          delay(this.pollFreq)
+    ))).subscribe();
+  }
+
+  stop() {
+    this.isPolling.next(false);
+    if (this.pollSubscription) {
+      this.pollSubscription.unsubscribe();
+    }
+    if (this.urlSubscription) {
+      this.urlSubscription.unsubscribe();
+    }
+  }
+}