Electrs server status page

frontend/src/app/components/server-health/server-health.component.html

@@ -0,0 +1,29 @@
+<div class="tomahawk">
+  <ng-container *ngIf="(hosts$ | async) as hosts">
+    <div class="status-panel">
+      <table class="status-table table table-borderless table-striped" *ngIf="(tip$ | async) as tip">
+        <tbody>
+          <tr>
+            <th class="active"></th>
+            <th class="host">Host</th>
+            <th class="rtt">RTT</th>
+            <th class="height">Height</th>
+          </tr>
+          <tr *ngFor="let host of hosts;" (click)="scrollTo(host)">
+            <td class="active"><span *ngIf="host.active">⭐️</span></td>
+            <td class="host">{{ host.host }}</td>
+            <td class="rtt">{{ host.rtt | number : '1.0-0' }} {{ host.rtt == null ? '' : 'ms'}} {{ !host.checked ? '⏳' : (host.unreachable ? '🔥' : '✅') }}</td>
+            <td class="height">{{ host.latestHeight }} {{ !host.checked ? '⏳' : (host.outOfSync ? '🚫' : (host.latestHeight && host.latestHeight < tip ? '🟧' : '✅')) }}</td>
+          </tr>
+        </tbody>
+      </table>
+    </div>
+  </ng-container>
+
+  <ng-container *ngFor="let host of hosts; trackBy: trackByFn">
+    <h5 [id]="host.host" class="hostLink">
+      <a [href]="host.link">{{ host.link }}</a>
+    </h5>
+    <iframe class="mempoolStatus" [src]="host.statusPage"></iframe>
+  </ng-container>
+</div>

frontend/src/app/components/server-health/server-health.component.scss

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+.tomahawk {
+  .status-panel {
+    max-width: 720px;
+    margin: auto;
+    margin-top: 2em;
+    padding: 1em;
+    background: #24273e;
+  }
+
+  .status-table {
+    width: 100%;
+
+    td, th {
+      padding: 0.25em;
+      &.rtt, &.height {
+        text-align: right;
+      }
+    }
+
+    td {
+      cursor: pointer;
+    }
+  }
+
+  .mempoolStatus {
+    width: 100%;
+    height: 270px;
+  }
+
+  .hostLink {
+    text-align: center;
+    margin: auto;
+    margin-top: 1em;
+  }
+}

frontend/src/app/components/server-health/server-health.component.ts

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+import { Component, OnInit, ChangeDetectionStrategy, SecurityContext, OnDestroy } from '@angular/core';
+import { WebsocketService } from '../../services/websocket.service';
+import { Observable, Subject, map, tap } from 'rxjs';
+import { StateService } from '../../services/state.service';
+import { HealthCheckHost } from '../../interfaces/websocket.interface';
+import { DomSanitizer } from '@angular/platform-browser';
+
+@Component({
+  selector: 'app-server-health',
+  templateUrl: './server-health.component.html',
+  styleUrls: ['./server-health.component.scss'],
+  changeDetection: ChangeDetectionStrategy.OnPush,
+})
+export class ServerHealthComponent implements OnInit, OnDestroy {
+  hosts$: Observable<HealthCheckHost[]>;
+  tip$: Subject<number>;
+  hosts: HealthCheckHost[] = [];
+
+  constructor(
+    private websocketService: WebsocketService,
+    private stateService: StateService,
+    public sanitizer: DomSanitizer,
+  ) {}
+
+  ngOnInit(): void {
+    this.hosts$ = this.stateService.serverHealth$.pipe(
+      map((hosts) => {
+        const subpath = window.location.pathname.slice(0, -6);
+        for (const host of hosts) {
+          let statusUrl = '';
+          let linkHost = '';
+          if (host.socket) {
+            statusUrl = window.location.host + subpath + '/status';
+            linkHost = window.location.host + subpath;
+          } else {
+            statusUrl = host.host.slice(0, -4) + subpath + '/status';
+            linkHost = host.host.slice(0, -4) + subpath;
+          }
+          host.statusPage = this.sanitizer.bypassSecurityTrustResourceUrl(this.sanitizer.sanitize(SecurityContext.URL, statusUrl));
+          host.link = linkHost;
+        }
+        return hosts;
+      }),
+      tap((hosts) => {
+        if (this.hosts.length !== hosts.length) {
+          this.hosts = hosts;
+        }
+      })
+    );
+    this.tip$ = this.stateService.chainTip$;
+    this.websocketService.want(['blocks', 'tomahawk']);
+  }
+
+  scrollTo(host: HealthCheckHost): void {
+    const el = document.getElementById(host.host);
+    if (el) {
+      el.scrollIntoView();
+    }
+  }
+
+  trackByFn(index: number, host: HealthCheckHost): string {
+    return host.host;
+  }
+
+  ngOnDestroy(): void {
+    this.hosts = [];
+  }
+}