Move block audit cache to apiService

frontend/src/app/services/api.service.ts

@@ -18,6 +18,7 @@ export class ApiService {
   private apiBasePath: string; // network path is /testnet, etc. or '' for mainnet
 
   private requestCache = new Map<string, { subject: BehaviorSubject<any>, expiry: number }>;
+  public blockAuditLoaded: { [hash: string]: boolean } = {};
 
   constructor(
     private httpClient: HttpClient,
@@ -370,6 +371,7 @@ export class ApiService {
   }
 
   getBlockAudit$(hash: string) : Observable<BlockAudit> {
+    this.setBlockAuditLoaded(hash);
     return this.httpClient.get<BlockAudit>(
       this.apiBaseUrl + this.apiBasePath + `/api/v1/block/${hash}/audit-summary`
     );
@@ -533,4 +535,13 @@ export class ApiService {
       this.apiBaseUrl + this.apiBasePath + '/api/v1/accelerations/total' + (queryString?.length ? '?' + queryString : '')
     );
   }
+
+  // Cache methods
+  async setBlockAuditLoaded(hash: string) {
+    this.blockAuditLoaded[hash] = true;
+  }
+
+  getBlockAuditLoaded(hash) {
+    return this.blockAuditLoaded[hash];
+  }
 }